chan_mgcp.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Implementation of Media Gateway Control Protocol
 *
 * \author Mark Spencer <[email protected]>
 *
 * \ingroup channel_drivers
 */

/*! \li \ref chan_mgcp.c uses the configuration file \ref mgcp.conf
 * \addtogroup configuration_file
 */

/*! \page mgcp.conf mgcp.conf
 * \verbinclude mgcp.conf.sample
 */

/*** MODULEINFO
 <use type="module">res_pktccops</use>
 <support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <fcntl.h>
#include <netdb.h>
#include <signal.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <ctype.h>

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/pickup.h"
#include "asterisk/pbx.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/acl.h"
#include "asterisk/callerid.h"
#include "asterisk/cli.h"
#include "asterisk/say.h"
#include "asterisk/astdb.h"
#include "asterisk/features.h"
#include "asterisk/app.h"
#include "asterisk/mwi.h"
#include "asterisk/musiconhold.h"
#include "asterisk/utils.h"
#include "asterisk/netsock2.h"
#include "asterisk/causes.h"
#include "asterisk/dsp.h"
#include "asterisk/devicestate.h"
#include "asterisk/stringfields.h"
#include "asterisk/abstract_jb.h"
#include "asterisk/chanvars.h"
#include "asterisk/pktccops.h"
#include "asterisk/stasis.h"
#include "asterisk/bridge.h"
#include "asterisk/features_config.h"
#include "asterisk/parking.h"
#include "asterisk/stasis_channels.h"
#include "asterisk/format_cache.h"

/*
 * Define to work around buggy dlink MGCP phone firmware which
 * appears not to know that "rt" is part of the "G" package.
 */
/* #define DLINK_BUGGY_FIRMWARE */

#define MGCPDUMPER
#define DEFAULT_EXPIRY 120
#define MAX_EXPIRY 3600
#define DIRECTMEDIA 1

#ifndef INADDR_NONE
#define INADDR_NONE (in_addr_t)(-1)
#endif

/*! Global jitterbuffer configuration - by default, jb is disabled
 * \note Values shown here match the defaults shown in mgcp.conf.sample */
static struct ast_jb_conf default_jbconf =
{
 .flags = 0,
 .max_size = 200,
 .resync_threshold = 1000,
 .impl = "fixed",
 .target_extra = 40,
};
static struct ast_jb_conf global_jbconf;

static const char tdesc[] = "Media Gateway Control Protocol (MGCP)";
static const char config[] = "mgcp.conf";

#define MGCP_DTMF_RFC2833 (1 << 0)
#define MGCP_DTMF_INBAND (1 << 1)
#define MGCP_DTMF_HYBRID (1 << 2)

#define DEFAULT_MGCP_GW_PORT 2427 /*!< From RFC 2705 */
#define DEFAULT_MGCP_CA_PORT 2727 /*!< From RFC 2705 */
#define MGCP_MAX_PACKET 1500 /*!< Also from RFC 2543, should sub headers tho */
#define DEFAULT_RETRANS 1000 /*!< How frequently to retransmit */
#define MAX_RETRANS 5 /*!< Try only 5 times for retransmissions */

/*! MGCP rtp stream modes { */
#define MGCP_CX_SENDONLY 0
#define MGCP_CX_RECVONLY 1
#define MGCP_CX_SENDRECV 2
#define MGCP_CX_CONF 3
#define MGCP_CX_CONFERENCE 3
#define MGCP_CX_MUTE 4
#define MGCP_CX_INACTIVE 4
/*! } */

static const char * const mgcp_cxmodes[] = {
 "sendonly",
 "recvonly",
 "sendrecv",
 "confrnce",
 "inactive"
};

enum {
 MGCP_CMD_EPCF,
 MGCP_CMD_CRCX,
 MGCP_CMD_MDCX,
 MGCP_CMD_DLCX,
 MGCP_CMD_RQNT,
 MGCP_CMD_NTFY,
 MGCP_CMD_AUEP,
 MGCP_CMD_AUCX,
 MGCP_CMD_RSIP
};

static char context[AST_MAX_EXTENSION] = "default";

static char language[MAX_LANGUAGE] = "";
static char musicclass[MAX_MUSICCLASS] = "";
static char parkinglot[AST_MAX_CONTEXT];
static char cid_num[AST_MAX_EXTENSION] = "";
static char cid_name[AST_MAX_EXTENSION] = "";

static int dtmfmode = 0;
static int nat = 0;
static int ncs = 0;
static int pktcgatealloc = 0;
static int hangupongateremove = 0;

static ast_group_t cur_callergroup = 0;
static ast_group_t cur_pickupgroup = 0;

static struct {
 unsigned int tos;
 unsigned int tos_audio;
 unsigned int cos;
 unsigned int cos_audio;
} qos = { 0, 0, 0, 0 };

static int immediate = 0;

static int callwaiting = 0;

static int callreturn = 0;

static int slowsequence = 0;

static int threewaycalling = 0;

/*! This is for flashhook transfers */
static int transfer = 0;

static int cancallforward = 0;

static int singlepath = 0;

static int directmedia = DIRECTMEDIA;

static char accountcode[AST_MAX_ACCOUNT_CODE] = "";

static char mailbox[AST_MAX_MAILBOX_UNIQUEID];

static int amaflags = 0;

static int adsi = 0;

static unsigned int oseq_global = 0;
AST_MUTEX_DEFINE_STATIC(oseq_lock);

/*! Wait up to 16 seconds for first digit (FXO logic) */
static int firstdigittimeout = 16000;

/*! How long to wait for following digits (FXO logic) */
static int gendigittimeout = 8000;

/*! How long to wait for an extra digit, if there is an ambiguous match */
static int matchdigittimeout = 3000;

/*! Protect the monitoring thread, so only one process can kill or start it, and not
 when it's doing something critical. */
AST_MUTEX_DEFINE_STATIC(netlock);

AST_MUTEX_DEFINE_STATIC(monlock);

/*! This is the thread for the monitor which checks for input on the channels
 * which are not currently in use.
 */
static pthread_t monitor_thread = AST_PTHREADT_NULL;

static int restart_monitor(void);

static struct ast_format_cap *global_capability;
static int nonCodecCapability = AST_RTP_DTMF;

static char ourhost[MAXHOSTNAMELEN];
static struct in_addr __ourip;
static int ourport;

static int mgcpdebug = 0;

static struct ast_sched_context *sched;
static struct io_context *io;
/*! The private structures of the mgcp channels are linked for
 * selecting outgoing channels
 */

#define MGCP_MAX_HEADERS 64
#define MGCP_MAX_LINES 64

struct mgcp_request {
 int len;
 char *verb;
 char *identifier;
 char *endpoint;
 char *version;
 int headers; /*!< MGCP Headers */
 char *header[MGCP_MAX_HEADERS];
 int lines; /*!< SDP Content */
 char *line[MGCP_MAX_LINES];
 char data[MGCP_MAX_PACKET];
 int cmd; /*!< int version of verb = command */
 unsigned int trid; /*!< int version of identifier = transaction id */
 struct mgcp_request *next; /*!< next in the queue */
};

/*! \brief mgcp_message: MGCP message for queuing up */
struct mgcp_message {
 struct mgcp_endpoint *owner_ep;
 struct mgcp_subchannel *owner_sub;
 int retrans;
 unsigned long expire;
 unsigned int seqno;
 int len;
 struct mgcp_message *next;
 char buf[0];
};

#define RESPONSE_TIMEOUT 30 /*!< in seconds */

struct mgcp_response {
 time_t whensent;
 int len;
 int seqno;
 struct mgcp_response *next;
 char buf[0];
};

#define MAX_SUBS 2

#define SUB_REAL 0
#define SUB_ALT 1

struct mgcp_subchannel {
 /*! subchannel magic string.
 Needed to prove that any subchannel pointer passed by asterisk
 really points to a valid subchannel memory area.
 Ugly.. But serves the purpose for the time being.
 */
#define MGCP_SUBCHANNEL_MAGIC "!978!"
 char magic[6];
 ast_mutex_t lock;
 int id;
 struct ast_channel *owner;
 struct mgcp_endpoint *parent;
 struct ast_rtp_instance *rtp;
 struct sockaddr_in tmpdest;
 char txident[80]; /*! \todo FIXME txident is replaced by rqnt_ident in endpoint.
 This should be obsoleted */
 char cxident[80];
 char callid[80];
 int cxmode;
 struct mgcp_request *cx_queue; /*!< pending CX commands */
 ast_mutex_t cx_queue_lock; /*!< CX queue lock */
 int nat;
 int iseq; /*!< Not used? RTP? */
 int outgoing;
 int alreadygone;
 int sdpsent;
 struct cops_gate *gate;
 struct mgcp_subchannel *next; /*!< for out circular linked list */
};

#define MGCP_ONHOOK 1
#define MGCP_OFFHOOK 2

#define TYPE_TRUNK 1
#define TYPE_LINE 2

struct mgcp_endpoint {
 ast_mutex_t lock;
 char name[80];
 struct mgcp_subchannel *sub; /*!< Pointer to our current connection, channel and stuff */
 char accountcode[AST_MAX_ACCOUNT_CODE];
 char exten[AST_MAX_EXTENSION]; /*!< Extention where to start */
 char context[AST_MAX_EXTENSION];
 char language[MAX_LANGUAGE];
 char cid_num[AST_MAX_EXTENSION]; /*!< Caller*ID number */
 char cid_name[AST_MAX_EXTENSION]; /*!< Caller*ID name */
 char lastcallerid[AST_MAX_EXTENSION]; /*!< Last Caller*ID */
 char dtmf_buf[AST_MAX_EXTENSION]; /*!< place to collect digits be */
 char call_forward[AST_MAX_EXTENSION]; /*!< Last Caller*ID */
 char musicclass[MAX_MUSICCLASS];
 char curtone[80]; /*!< Current tone */
 char mailbox[AST_MAX_EXTENSION];
 char parkinglot[AST_MAX_CONTEXT]; /*!< Parkinglot */
 struct ast_mwi_subscriber *mwi_event_sub;
 ast_group_t callgroup;
 ast_group_t pickupgroup;
 int callwaiting;
 int hascallwaiting;
 int transfer;
 int threewaycalling;
 int singlepath;
 int cancallforward;
 int directmedia;
 int callreturn;
 int dnd; /* How does this affect callwait? Do we just deny a mgcp_request if we're dnd? */
 int hascallerid;
 int hidecallerid;
 int dtmfmode;
 int amaflags;
 int ncs;
 int pktcgatealloc;
 int hangupongateremove;
 int type;
 int slowsequence; /*!< MS: Sequence the endpoint as a whole */
 int group;
 int iseq; /*!< Not used? */
 int lastout; /*!< tracking this on the subchannels. Is it needed here? */
 int needdestroy; /*!< Not used? */
 struct ast_format_cap *cap;
 int nonCodecCapability;
 int onhooktime;
 int msgstate; /*!< voicemail message state */
 int immediate;
 int hookstate;
 int adsi;
 char rqnt_ident[80]; /*!< request identifier */
 struct mgcp_request *rqnt_queue; /*!< pending RQNT commands */
 ast_mutex_t rqnt_queue_lock;
 struct mgcp_request *cmd_queue; /*!< pending commands other than RQNT */
 ast_mutex_t cmd_queue_lock;
 int delme; /*!< needed for reload */
 int needaudit; /*!< needed for reload */
 struct ast_dsp *dsp; /*!< XXX Should there be a dsp/subchannel? XXX */
 /* owner is tracked on the subchannels, and the *sub indicates whos in charge */
 /* struct ast_channel *owner; */
 /* struct ast_rtp *rtp; */
 /* struct sockaddr_in tmpdest; */
 /* message go the endpoint and not the channel so they stay here */
 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
 struct mgcp_endpoint *next;
 struct mgcp_gateway *parent;
};

static struct mgcp_gateway {
 /* A gateway containing one or more endpoints */
 char name[80];
 int isnamedottedip; /*!< is the name FQDN or dotted ip */
 struct sockaddr_in addr;
 struct sockaddr_in defaddr;
 struct in_addr ourip;
 int dynamic;
 int expire; /*!< XXX Should we ever expire dynamic registrations? XXX */
 struct mgcp_endpoint *endpoints;
 struct ast_ha *ha;
/* obsolete
 time_t lastouttime;
 int lastout;
 int messagepending;
*/
/* Wildcard endpoint name */
 char wcardep[30];
 struct mgcp_message *msgs; /*!< gw msg queue */
 ast_mutex_t msgs_lock; /*!< queue lock */
 int retransid; /*!< retrans timer id */
 int delme; /*!< needed for reload */
 int realtime;
 struct mgcp_response *responses;
 struct mgcp_gateway *next;
} *gateways = NULL;

AST_MUTEX_DEFINE_STATIC(mgcp_reload_lock);
static int mgcp_reloading = 0;

/*! \brief gatelock: mutex for gateway/endpoint lists */
AST_MUTEX_DEFINE_STATIC(gatelock);

static int mgcpsock = -1;

static struct sockaddr_in bindaddr;

static void mgcp_set_owner(struct mgcp_subchannel *sub, struct ast_channel *chan);
static struct ast_frame *mgcp_read(struct ast_channel *ast);
static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest);
static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone);
static int transmit_modify_request(struct mgcp_subchannel *sub);
static int transmit_connect(struct mgcp_subchannel *sub);
static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername);
static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp, const struct ast_format_cap *codecs);
static int transmit_connection_del(struct mgcp_subchannel *sub);
static int transmit_audit_endpoint(struct mgcp_endpoint *p);
static void start_rtp(struct mgcp_subchannel *sub);
static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 int result, unsigned int ident, struct mgcp_request *resp);
static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub);
static char *mgcp_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
static int reload_config(int reload);

static struct ast_channel *mgcp_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *dest, int *cause);
static int mgcp_call(struct ast_channel *ast, const char *dest, int timeout);
static int mgcp_hangup(struct ast_channel *ast);
static int mgcp_answer(struct ast_channel *ast);
static struct ast_frame *mgcp_read(struct ast_channel *ast);
static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame);
static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen);
static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
static int mgcp_senddigit_begin(struct ast_channel *ast, char digit);
static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration);
static int mgcp_devicestate(const char *data);
static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp, char *tone);
static int transmit_connect_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp);
static struct mgcp_gateway *build_gateway(char *cat, struct ast_variable *v);
static int mgcp_alloc_pktcgate(struct mgcp_subchannel *sub);
static int acf_channel_read(struct ast_channel *chan, const char *funcname, char *preparse, char *buf, size_t buflen);
static struct ast_variable *add_var(const char *buf, struct ast_variable *list);
static struct ast_variable *copy_vars(struct ast_variable *src);

static struct ast_channel_tech mgcp_tech = {
 .type = "MGCP",
 .description = tdesc,
 .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
 .requester = mgcp_request,
 .devicestate = mgcp_devicestate,
 .call = mgcp_call,
 .hangup = mgcp_hangup,
 .answer = mgcp_answer,
 .read = mgcp_read,
 .write = mgcp_write,
 .indicate = mgcp_indicate,
 .fixup = mgcp_fixup,
 .send_digit_begin = mgcp_senddigit_begin,
 .send_digit_end = mgcp_senddigit_end,
 .func_channel_read = acf_channel_read,
};

static int has_voicemail(struct mgcp_endpoint *p)
{
 int new_msgs;
 RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);

 msg = stasis_cache_get(ast_mwi_state_cache(), ast_mwi_state_type(), p->mailbox);
 if (msg) {
 struct ast_mwi_state *mwi_state = stasis_message_data(msg);
 new_msgs = mwi_state->new_msgs;
 } else {
 new_msgs = ast_app_has_voicemail(p->mailbox, NULL);
 }

 return new_msgs;
}

static int unalloc_sub(struct mgcp_subchannel *sub)
{
 struct mgcp_endpoint *p = sub->parent;
 if (p->sub == sub) {
 ast_log(LOG_WARNING, "Trying to unalloc the real channel %s@%s?!?\n", p->name, p->parent->name);
 return -1;
 }
 ast_debug(1, "Released sub %d of channel %s@%s\n", sub->id, p->name, p->parent->name);

 mgcp_set_owner(sub, NULL);
 if (!ast_strlen_zero(sub->cxident)) {
 transmit_connection_del(sub);
 }
 sub->cxident[0] = '\0';
 sub->callid[0] = '\0';
 sub->cxmode = MGCP_CX_INACTIVE;
 sub->outgoing = 0;
 sub->alreadygone = 0;
 memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
 if (sub->rtp) {
 ast_rtp_instance_destroy(sub->rtp);
 sub->rtp = NULL;
 }
 dump_cmd_queues(NULL, sub);
 return 0;
}

/* modified for new transport mechanism */
static int __mgcp_xmit(struct mgcp_gateway *gw, char *data, int len)
{
 int res;
 if (gw->addr.sin_addr.s_addr)
 res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->addr, sizeof(struct sockaddr_in));
 else
 res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->defaddr, sizeof(struct sockaddr_in));
 if (res != len) {
 ast_log(LOG_WARNING, "mgcp_xmit returned %d: %s\n", res, strerror(errno));
 }
 return res;
}

static int resend_response(struct mgcp_subchannel *sub, struct mgcp_response *resp)
{
 struct mgcp_endpoint *p = sub->parent;
 int res;
 ast_debug(1, "Retransmitting:\n%s\n to %s:%d\n", resp->buf, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
 res = __mgcp_xmit(p->parent, resp->buf, resp->len);
 if (res > 0)
 res = 0;
 return res;
}

static int send_response(struct mgcp_subchannel *sub, struct mgcp_request *req)
{
 struct mgcp_endpoint *p = sub->parent;
 int res;
 ast_debug(1, "Transmitting:\n%s\n to %s:%d\n", req->data, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
 res = __mgcp_xmit(p->parent, req->data, req->len);
 if (res > 0)
 res = 0;
 return res;
}

/* modified for new transport framework */
static void dump_queue(struct mgcp_gateway *gw, struct mgcp_endpoint *p)
{
 struct mgcp_message *cur, *q = NULL, *w, *prev;

 ast_mutex_lock(&gw->msgs_lock);
 for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
 if (!p || cur->owner_ep == p) {
 if (prev) {
 prev->next = cur->next;
 } else {
 gw->msgs = cur->next;
 }

 ast_log(LOG_NOTICE, "Removing message from %s transaction %u\n",
 gw->name, cur->seqno);

 w = cur;
 if (q) {
 w->next = q;
 } else {
 w->next = NULL;
 }
 q = w;
 }
 }
 ast_mutex_unlock(&gw->msgs_lock);

 while (q) {
 cur = q;
 q = q->next;
 ast_free(cur);
 }
}

static void mgcp_queue_frame(struct mgcp_subchannel *sub, struct ast_frame *f)
{
 for (;;) {
 if (sub->owner) {
 if (!ast_channel_trylock(sub->owner)) {
 ast_queue_frame(sub->owner, f);
 ast_channel_unlock(sub->owner);
 break;
 } else {
 DEADLOCK_AVOIDANCE(&sub->lock);
 }
 } else {
 break;
 }
 }
}

static void mgcp_queue_hangup(struct mgcp_subchannel *sub)
{
 for (;;) {
 if (sub->owner) {
 if (!ast_channel_trylock(sub->owner)) {
 ast_queue_hangup(sub->owner);
 ast_channel_unlock(sub->owner);
 break;
 } else {
 DEADLOCK_AVOIDANCE(&sub->lock);
 }
 } else {
 break;
 }
 }
}

static void mgcp_queue_control(struct mgcp_subchannel *sub, int control)
{
 struct ast_frame f = { AST_FRAME_CONTROL, { control } };
 return mgcp_queue_frame(sub, &f);
}

static int retrans_pkt(const void *data)
{
 struct mgcp_gateway *gw = (struct mgcp_gateway *)data;
 struct mgcp_message *cur, *exq = NULL, *w, *prev;
 int res = 0;

 /* find out expired msgs */
 ast_mutex_lock(&gw->msgs_lock);

 for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
 if (cur->retrans < MAX_RETRANS) {
 cur->retrans++;
 ast_debug(1, "Retransmitting #%d transaction %u on [%s]\n",
 cur->retrans, cur->seqno, gw->name);
 __mgcp_xmit(gw, cur->buf, cur->len);
 } else {
 if (prev)
 prev->next = cur->next;
 else
 gw->msgs = cur->next;

 ast_log(LOG_WARNING, "Maximum retries exceeded for transaction %u on [%s]\n",
 cur->seqno, gw->name);

 w = cur;

 if (exq) {
 w->next = exq;
 } else {
 w->next = NULL;
 }
 exq = w;
 }
 }

 if (!gw->msgs) {
 gw->retransid = -1;
 res = 0;
 } else {
 res = 1;
 }
 ast_mutex_unlock(&gw->msgs_lock);

 while (exq) {
 cur = exq;
 /* time-out transaction */
 handle_response(cur->owner_ep, cur->owner_sub, 406, cur->seqno, NULL);
 exq = exq->next;
 ast_free(cur);
 }

 return res;
}

/* modified for the new transaction mechanism */
static int mgcp_postrequest(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 char *data, int len, unsigned int seqno)
{
 struct mgcp_message *msg;
 struct mgcp_message *cur;
 struct mgcp_gateway *gw;
 struct timeval now;

 if (!(msg = ast_malloc(sizeof(*msg) + len))) {
 return -1;
 }
 if (!(gw = ((p && p->parent) ? p->parent : NULL))) {
 ast_free(msg);
 return -1;
 }

 msg->owner_sub = sub;
 msg->owner_ep = p;
 msg->seqno = seqno;
 msg->next = NULL;
 msg->len = len;
 msg->retrans = 0;
 memcpy(msg->buf, data, msg->len);

 ast_mutex_lock(&gw->msgs_lock);
 for (cur = gw->msgs; cur && cur->next; cur = cur->next);
 if (cur) {
 cur->next = msg;
 } else {
 gw->msgs = msg;
 }

 now = ast_tvnow();
 msg->expire = now.tv_sec * 1000 + now.tv_usec / 1000 + DEFAULT_RETRANS;

 if (gw->retransid == -1)
 gw->retransid = ast_sched_add(sched, DEFAULT_RETRANS, retrans_pkt, (void *)gw);
 ast_mutex_unlock(&gw->msgs_lock);
 __mgcp_xmit(gw, msg->buf, msg->len);
 /* XXX Should schedule retransmission XXX */
 return 0;
}

/* modified for new transport */
static int send_request(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 struct mgcp_request *req, unsigned int seqno)
{
 int res = 0;
 struct mgcp_request **queue, *q, *r, *t;
 ast_mutex_t *l;

 ast_debug(1, "Slow sequence is %d\n", p->slowsequence);
 if (p->slowsequence) {
 queue = &p->cmd_queue;
 l = &p->cmd_queue_lock;
 ast_mutex_lock(l);
 } else {
 switch (req->cmd) {
 case MGCP_CMD_DLCX:
 queue = &sub->cx_queue;
 l = &sub->cx_queue_lock;
 ast_mutex_lock(l);
 q = sub->cx_queue;
 /* delete pending cx cmds */
 /* buggy sb5120 */
 if (!sub->parent->ncs) {
 while (q) {
 r = q->next;
 ast_free(q);
 q = r;
 }
 *queue = NULL;
 }
 break;

 case MGCP_CMD_CRCX:
 case MGCP_CMD_MDCX:
 queue = &sub->cx_queue;
 l = &sub->cx_queue_lock;
 ast_mutex_lock(l);
 break;

 case MGCP_CMD_RQNT:
 queue = &p->rqnt_queue;
 l = &p->rqnt_queue_lock;
 ast_mutex_lock(l);
 break;

 default:
 queue = &p->cmd_queue;
 l = &p->cmd_queue_lock;
 ast_mutex_lock(l);
 break;
 }
 }

 if (!(r = ast_malloc(sizeof(*r)))) {
 ast_log(LOG_WARNING, "Cannot post MGCP request: insufficient memory\n");
 ast_mutex_unlock(l);
 return -1;
 }
 memcpy(r, req, sizeof(*r));

 if (!(*queue)) {
 ast_debug(1, "Posting Request:\n%s to %s:%d\n", req->data,
 ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));

 res = mgcp_postrequest(p, sub, req->data, req->len, seqno);
 } else {
 ast_debug(1, "Queueing Request:\n%s to %s:%d\n", req->data,
 ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
 }

 /* XXX find tail. We could also keep tail in the data struct for faster access */
 for (t = *queue; t && t->next; t = t->next);

 r->next = NULL;
 if (t)
 t->next = r;
 else
 *queue = r;

 ast_mutex_unlock(l);

 return res;
}

static int mgcp_call(struct ast_channel *ast, const char *dest, int timeout)
{
 int res;
 struct mgcp_endpoint *p;
 struct mgcp_subchannel *sub;
 char tone[50] = "";
 const char *distinctive_ring = pbx_builtin_getvar_helper(ast, "ALERT_INFO");

 ast_debug(3, "MGCP mgcp_call(%s)\n", ast_channel_name(ast));
 sub = ast_channel_tech_pvt(ast);
 p = sub->parent;

 ast_mutex_lock(&sub->lock);
 switch (p->hookstate) {
 case MGCP_OFFHOOK:
 if (!ast_strlen_zero(distinctive_ring)) {
 snprintf(tone, sizeof(tone), "L/wt%s", distinctive_ring);
 ast_debug(3, "MGCP distinctive callwait %s\n", tone);
 } else {
 ast_copy_string(tone, (p->ncs ? "L/wt1" : "L/wt"), sizeof(tone));
 ast_debug(3, "MGCP normal callwait %s\n", tone);
 }
 break;
 case MGCP_ONHOOK:
 default:
 if (!ast_strlen_zero(distinctive_ring)) {
 snprintf(tone, sizeof(tone), "L/r%s", distinctive_ring);
 ast_debug(3, "MGCP distinctive ring %s\n", tone);
 } else {
 ast_copy_string(tone, "L/rg", sizeof(tone));
 ast_debug(3, "MGCP default ring\n");
 }
 break;
 }

 if ((ast_channel_state(ast) != AST_STATE_DOWN) && (ast_channel_state(ast) != AST_STATE_RESERVED)) {
 ast_log(LOG_WARNING, "mgcp_call called on %s, neither down nor reserved\n", ast_channel_name(ast));
 ast_mutex_unlock(&sub->lock);
 return -1;
 }

 res = 0;
 sub->outgoing = 1;
 sub->cxmode = MGCP_CX_RECVONLY;
 ast_setstate(ast, AST_STATE_RINGING);
 if (p->type == TYPE_LINE) {
 if (!sub->rtp) {
 start_rtp(sub);
 } else {
 transmit_modify_request(sub);
 }

 if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
 /* try to prevent a callwait from disturbing the other connection */
 sub->next->cxmode = MGCP_CX_RECVONLY;
 transmit_modify_request(sub->next);
 }

 transmit_notify_request_with_callerid(sub, tone,
 S_COR(ast_channel_connected(ast)->id.number.valid, ast_channel_connected(ast)->id.number.str, ""),
 S_COR(ast_channel_connected(ast)->id.name.valid, ast_channel_connected(ast)->id.name.str, ""));
 ast_setstate(ast, AST_STATE_RINGING);

 if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
 /* Put the connection back in sendrecv */
 sub->next->cxmode = MGCP_CX_SENDRECV;
 transmit_modify_request(sub->next);
 }
 } else {
 ast_log(LOG_NOTICE, "Don't know how to dial on trunks yet\n");
 res = -1;
 }
 ast_mutex_unlock(&sub->lock);
 return res;
}

static int mgcp_hangup(struct ast_channel *ast)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(ast);
 struct mgcp_endpoint *p = sub->parent;

 ast_debug(1, "mgcp_hangup(%s)\n", ast_channel_name(ast));
 if (!ast_channel_tech_pvt(ast)) {
 ast_debug(1, "Asked to hangup channel not connected\n");
 return 0;
 }
 if (strcmp(sub->magic, MGCP_SUBCHANNEL_MAGIC)) {
 ast_debug(1, "Invalid magic. MGCP subchannel freed up already.\n");
 return 0;
 }
 ast_mutex_lock(&sub->lock);
 ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s\n", ast_channel_name(ast), p->name, p->parent->name);

 if ((p->dtmfmode & MGCP_DTMF_INBAND) && p->dsp) {
 /* check whether other channel is active. */
 if (!sub->next->owner) {
 if (p->dtmfmode & MGCP_DTMF_HYBRID) {
 p->dtmfmode &= ~MGCP_DTMF_INBAND;
 }
 ast_debug(2, "MGCP free dsp on %s@%s\n", p->name, p->parent->name);
 ast_dsp_free(p->dsp);
 p->dsp = NULL;
 }
 }

 mgcp_set_owner(sub, NULL);

 /* for deleting gate */
 if (p->pktcgatealloc && sub->gate) {
 sub->gate->gate_open = NULL;
 sub->gate->gate_remove = NULL;
 sub->gate->got_dq_gi = NULL;
 sub->gate->tech_pvt = NULL;
 if (sub->gate->state == GATE_ALLOC_PROGRESS || sub->gate->state == GATE_ALLOCATED) {
 ast_pktccops_gate_alloc(GATE_DEL, sub->gate, 0, 0, 0, 0, 0, 0, NULL, NULL);
 } else {
 sub->gate->deltimer = time(NULL) + 5;
 }
 sub->gate = NULL;
 }

 if (!ast_strlen_zero(sub->cxident)) {
 transmit_connection_del(sub);
 }
 sub->cxident[0] = '\0';
 if ((sub == p->sub) && sub->next->owner) {
 RAII_VAR(struct ast_channel *, bridged, ast_channel_bridge_peer(sub->next->owner), ast_channel_cleanup);

 if (p->hookstate == MGCP_OFFHOOK) {
 if (sub->next->owner && bridged) {
 /* ncs fix! */
 transmit_notify_request_with_callerid(p->sub, (p->ncs ? "L/wt1" : "L/wt"),
 S_COR(ast_channel_caller(bridged)->id.number.valid, ast_channel_caller(bridged)->id.number.str, ""),
 S_COR(ast_channel_caller(bridged)->id.name.valid, ast_channel_caller(bridged)->id.name.str, ""));
 }
 } else {
 /* set our other connection as the primary and swith over to it */
 p->sub = sub->next;
 p->sub->cxmode = MGCP_CX_RECVONLY;
 transmit_modify_request(p->sub);
 if (sub->next->owner && bridged) {
 transmit_notify_request_with_callerid(p->sub, "L/rg",
 S_COR(ast_channel_caller(bridged)->id.number.valid, ast_channel_caller(bridged)->id.number.str, ""),
 S_COR(ast_channel_caller(bridged)->id.name.valid, ast_channel_caller(bridged)->id.name.str, ""));
 }
 }

 } else if ((sub == p->sub->next) && p->hookstate == MGCP_OFFHOOK) {
 transmit_notify_request(sub, p->ncs ? "" : "L/v");
 } else if (p->hookstate == MGCP_OFFHOOK) {
 transmit_notify_request(sub, "L/ro");
 } else {
 transmit_notify_request(sub, "");
 }

 ast_channel_tech_pvt_set(ast, NULL);
 sub->alreadygone = 0;
 sub->outgoing = 0;
 sub->cxmode = MGCP_CX_INACTIVE;
 sub->callid[0] = '\0';
 if (p) {
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 }
 /* Reset temporary destination */
 memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
 if (sub->rtp) {
 ast_rtp_instance_destroy(sub->rtp);
 sub->rtp = NULL;
 }

 ast_module_unref(ast_module_info->self);

 if ((p->hookstate == MGCP_ONHOOK) && (!sub->next->rtp)) {
 p->hidecallerid = 0;
 if (p->hascallwaiting && !p->callwaiting) {
 ast_verb(3, "Enabling call waiting on %s\n", ast_channel_name(ast));
 p->callwaiting = -1;
 }
 if (has_voicemail(p)) {
 ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s set vmwi(+)\n",
 ast_channel_name(ast), p->name, p->parent->name);
 transmit_notify_request(sub, "L/vmwi(+)");
 } else {
 ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s set vmwi(-)\n",
 ast_channel_name(ast), p->name, p->parent->name);
 transmit_notify_request(sub, "L/vmwi(-)");
 }
 }
 ast_mutex_unlock(&sub->lock);
 return 0;
}

static char *handle_mgcp_show_endpoints(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
 struct mgcp_gateway *mg;
 struct mgcp_endpoint *me;
 int hasendpoints = 0;
 struct ast_variable * v = NULL;

 switch (cmd) {
 case CLI_INIT:
 e->command = "mgcp show endpoints";
 e->usage =
 "Usage: mgcp show endpoints\n"
 " Lists all endpoints known to the MGCP (Media Gateway Control Protocol) subsystem.\n";
 return NULL;
 case CLI_GENERATE:
 return NULL;
 }

 if (a->argc != 3) {
 return CLI_SHOWUSAGE;
 }
 ast_mutex_lock(&gatelock);
 for (mg = gateways; mg; mg = mg->next) {
 ast_cli(a->fd, "Gateway '%s' at %s (%s%s)\n", mg->name, mg->addr.sin_addr.s_addr ? ast_inet_ntoa(mg->addr.sin_addr) : ast_inet_ntoa(mg->defaddr.sin_addr), mg->realtime ? "Realtime, " : "", mg->dynamic ? "Dynamic" : "Static");
 for (me = mg->endpoints; me; me = me->next) {
 ast_cli(a->fd, " -- '%s@%s in '%s' is %s\n", me->name, mg->name, me->context, me->sub->owner ? "active" : "idle");
 if (me->chanvars) {
 ast_cli(a->fd, " Variables:\n");
 for (v = me->chanvars ; v ; v = v->next) {
 ast_cli(a->fd, " %s = '%s'\n", v->name, v->value);
 }
 }
 hasendpoints = 1;
 }
 if (!hasendpoints) {
 ast_cli(a->fd, " << No Endpoints Defined >> ");
 }
 }
 ast_mutex_unlock(&gatelock);
 return CLI_SUCCESS;
}

static char *handle_mgcp_audit_endpoint(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
 struct mgcp_gateway *mg;
 struct mgcp_endpoint *me;
 int found = 0;
 char *ename,*gname, *c;

 switch (cmd) {
 case CLI_INIT:
 e->command = "mgcp audit endpoint";
 e->usage =
 "Usage: mgcp audit endpoint <endpointid>\n"
 " Lists the capabilities of an endpoint in the MGCP (Media Gateway Control Protocol) subsystem.\n"
 " mgcp debug MUST be on to see the results of this command.\n";
 return NULL;
 case CLI_GENERATE:
 return NULL;
 }

 if (!mgcpdebug) {
 return CLI_SHOWUSAGE;
 }
 if (a->argc != 4)
 return CLI_SHOWUSAGE;
 /* split the name into parts by null */
 ename = ast_strdupa(a->argv[3]);
 for (gname = ename; *gname; gname++) {
 if (*gname == '@') {
 *gname = 0;
 gname++;
 break;
 }
 }
 if (gname[0] == '[') {
 gname++;
 }
 if ((c = strrchr(gname, ']'))) {
 *c = '\0';
 }
 ast_mutex_lock(&gatelock);
 for (mg = gateways; mg; mg = mg->next) {
 if (!strcasecmp(mg->name, gname)) {
 for (me = mg->endpoints; me; me = me->next) {
 if (!strcasecmp(me->name, ename)) {
 found = 1;
 transmit_audit_endpoint(me);
 break;
 }
 }
 if (found) {
 break;
 }
 }
 }
 if (!found) {
 ast_cli(a->fd, " << Could not find endpoint >> ");
 }
 ast_mutex_unlock(&gatelock);
 return CLI_SUCCESS;
}

static char *handle_mgcp_set_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
 switch (cmd) {
 case CLI_INIT:
 e->command = "mgcp set debug {on|off}";
 e->usage =
 "Usage: mgcp set debug {on|off}\n"
 " Enables/Disables dumping of MGCP packets for debugging purposes\n";
 return NULL;
 case CLI_GENERATE:
 return NULL;
 }

 if (a->argc != e->args)
 return CLI_SHOWUSAGE;

 if (!strncasecmp(a->argv[e->args - 1], "on", 2)) {
 mgcpdebug = 1;
 ast_cli(a->fd, "MGCP Debugging Enabled\n");
 } else if (!strncasecmp(a->argv[3], "off", 3)) {
 mgcpdebug = 0;
 ast_cli(a->fd, "MGCP Debugging Disabled\n");
 } else {
 return CLI_SHOWUSAGE;
 }
 return CLI_SUCCESS;
}

static struct ast_cli_entry cli_mgcp[] = {
 AST_CLI_DEFINE(handle_mgcp_audit_endpoint, "Audit specified MGCP endpoint"),
 AST_CLI_DEFINE(handle_mgcp_show_endpoints, "List defined MGCP endpoints"),
 AST_CLI_DEFINE(handle_mgcp_set_debug, "Enable/Disable MGCP debugging"),
 AST_CLI_DEFINE(mgcp_reload, "Reload MGCP configuration"),
};

static int mgcp_answer(struct ast_channel *ast)
{
 int res = 0;
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(ast);
 struct mgcp_endpoint *p = sub->parent;

 ast_mutex_lock(&sub->lock);
 sub->cxmode = MGCP_CX_SENDRECV;
 if (!sub->rtp) {
 start_rtp(sub);
 } else {
 transmit_modify_request(sub);
 }
 ast_verb(3, "MGCP mgcp_answer(%s) on %s@%s-%d\n",
 ast_channel_name(ast), p->name, p->parent->name, sub->id);
 if (ast_channel_state(ast) != AST_STATE_UP) {
 ast_setstate(ast, AST_STATE_UP);
 ast_debug(1, "mgcp_answer(%s)\n", ast_channel_name(ast));
 transmit_notify_request(sub, "");
 transmit_modify_request(sub);
 }
 ast_mutex_unlock(&sub->lock);
 return res;
}

static struct ast_frame *mgcp_rtp_read(struct mgcp_subchannel *sub)
{
 /* Retrieve audio/etc from channel. Assumes sub->lock is already held. */
 struct ast_frame *f;

 f = ast_rtp_instance_read(sub->rtp, 0);
 /* Don't send RFC2833 if we're not supposed to */
 if (f && (f->frametype == AST_FRAME_DTMF) && !(sub->parent->dtmfmode & MGCP_DTMF_RFC2833))
 return &ast_null_frame;
 if (sub->owner) {
 /* We already hold the channel lock */
 if (f->frametype == AST_FRAME_VOICE) {
 if (ast_format_cap_iscompatible_format(ast_channel_nativeformats(sub->owner), f->subclass.format) == AST_FORMAT_CMP_NOT_EQUAL) {
 struct ast_format_cap *caps;

 ast_debug(1, "Oooh, format changed to %s\n", ast_format_get_name(f->subclass.format));

 caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
 if (caps) {
 ast_format_cap_append(caps, f->subclass.format, 0);
 ast_channel_nativeformats_set(sub->owner, caps);
 ao2_ref(caps, -1);
 } else {
 return &ast_null_frame;
 }

 ast_set_read_format(sub->owner, ast_channel_readformat(sub->owner));
 ast_set_write_format(sub->owner, ast_channel_writeformat(sub->owner));
 }
 /* Courtesy fearnor aka [email protected] */
 if ((sub->parent->dtmfmode & MGCP_DTMF_INBAND) && (sub->parent->dsp)) {
#if 0
 ast_log(LOG_NOTICE, "MGCP ast_dsp_process\n");
#endif
 f = ast_dsp_process(sub->owner, sub->parent->dsp, f);
 }
 }
 }
 return f;
}

static void mgcp_set_owner(struct mgcp_subchannel *sub, struct ast_channel *chan)
{
 sub->owner = chan;
 if (sub->rtp) {
 ast_rtp_instance_set_channel_id(sub->rtp, sub->owner ? ast_channel_uniqueid(chan) : "");
 }
}

static struct ast_frame *mgcp_read(struct ast_channel *ast)
{
 struct ast_frame *f;
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(ast);
 ast_mutex_lock(&sub->lock);
 f = mgcp_rtp_read(sub);
 ast_mutex_unlock(&sub->lock);
 return f;
}

static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(ast);
 int res = 0;

 if (frame->frametype != AST_FRAME_VOICE) {
 if (frame->frametype == AST_FRAME_IMAGE)
 return 0;
 else {
 ast_log(LOG_WARNING, "Can't send %u type frames with MGCP write\n", frame->frametype);
 return 0;
 }
 } else {
 if (ast_format_cap_iscompatible_format(ast_channel_nativeformats(ast), frame->subclass.format) == AST_FORMAT_CMP_NOT_EQUAL) {
 struct ast_str *cap_buf = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);

 ast_log(LOG_WARNING, "Asked to transmit frame type %s, while native formats is %s (read/write = %s/%s)\n",
 ast_format_get_name(frame->subclass.format),
 ast_format_cap_get_names(ast_channel_nativeformats(ast), &cap_buf),
 ast_format_get_name(ast_channel_readformat(ast)),
 ast_format_get_name(ast_channel_writeformat(ast)));
 /* return -1; */
 }
 }
 if (sub) {
 ast_mutex_lock(&sub->lock);
 if (!sub->sdpsent && sub->gate) {
 if (sub->gate->state == GATE_ALLOCATED) {
 ast_debug(1, "GATE ALLOCATED, sending sdp\n");
 transmit_modify_with_sdp(sub, NULL, 0);
 }
 }
 if ((sub->parent->sub == sub) || !sub->parent->singlepath) {
 if (sub->rtp) {
 res = ast_rtp_instance_write(sub->rtp, frame);
 }
 }
 ast_mutex_unlock(&sub->lock);
 }
 return res;
}

static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(newchan);

 ast_mutex_lock(&sub->lock);
 ast_log(LOG_NOTICE, "mgcp_fixup(%s, %s)\n", ast_channel_name(oldchan), ast_channel_name(newchan));
 if (sub->owner != oldchan) {
 ast_mutex_unlock(&sub->lock);
 ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, sub->owner);
 return -1;
 }
 mgcp_set_owner(sub, newchan);
 ast_mutex_unlock(&sub->lock);
 return 0;
}

static int mgcp_senddigit_begin(struct ast_channel *ast, char digit)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(ast);
 struct mgcp_endpoint *p = sub->parent;
 int res = 0;

 ast_mutex_lock(&sub->lock);
 if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
 ast_debug(1, "Sending DTMF using inband/hybrid\n");
 res = -1; /* Let asterisk play inband indications */
 } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
 ast_debug(1, "Sending DTMF using RFC2833\n");
 ast_rtp_instance_dtmf_begin(sub->rtp, digit);
 } else {
 ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
 }
 ast_mutex_unlock(&sub->lock);

 return res;
}

static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(ast);
 struct mgcp_endpoint *p = sub->parent;
 int res = 0;
 char tmp[4];

 ast_mutex_lock(&sub->lock);
 if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
 ast_debug(1, "Stopping DTMF using inband/hybrid\n");
 res = -1; /* Tell Asterisk to stop inband indications */
 } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
 ast_debug(1, "Stopping DTMF using RFC2833\n");
 if (sub->parent->ncs) {
 tmp[0] = digit;
 tmp[1] = '\0';
 } else {
 tmp[0] = 'D';
 tmp[1] = '/';
 tmp[2] = digit;
 tmp[3] = '\0';
 }
 transmit_notify_request(sub, tmp);
 ast_rtp_instance_dtmf_end(sub->rtp, digit);
 } else {
 ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
 }
 ast_mutex_unlock(&sub->lock);

 return res;
}

/*!
 * \brief mgcp_devicestate: channel callback for device status monitoring
 * \param data tech/resource name of MGCP device to query
 *
 * Callback for device state management in channel subsystem
 * to obtain device status (up/down) of a specific MGCP endpoint
 *
 * \return device status result (from devicestate.h) AST_DEVICE_INVALID (not available) or AST_DEVICE_UNKNOWN (available but unknown state)
 */
static int mgcp_devicestate(const char *data)
{
 struct mgcp_gateway *g;
 struct mgcp_endpoint *e = NULL;
 char *tmp, *endpt, *gw;
 int ret = AST_DEVICE_INVALID;

 endpt = ast_strdupa(data);
 if ((tmp = strchr(endpt, '@'))) {
 *tmp++ = '\0';
 gw = tmp;
 } else
 goto error;

 ast_mutex_lock(&gatelock);
 for (g = gateways; g; g = g->next) {
 if (strcasecmp(g->name, gw) == 0) {
 e = g->endpoints;
 break;
 }
 }

 if (!e)
 goto error;

 for (; e; e = e->next) {
 if (strcasecmp(e->name, endpt) == 0) {
 break;
 }
 }

 if (!e)
 goto error;

 /*
 * As long as the gateway/endpoint is valid, we'll
 * assume that the device is available and its state
 * can be tracked.
 */
 ret = AST_DEVICE_UNKNOWN;

error:
 ast_mutex_unlock(&gatelock);
 return ret;
}

static char *control2str(int ind) {
 switch (ind) {
 case AST_CONTROL_HANGUP:
 return "Other end has hungup";
 case AST_CONTROL_RING:
 return "Local ring";
 case AST_CONTROL_RINGING:
 return "Remote end is ringing";
 case AST_CONTROL_ANSWER:
 return "Remote end has answered";
 case AST_CONTROL_BUSY:
 return "Remote end is busy";
 case AST_CONTROL_TAKEOFFHOOK:
 return "Make it go off hook";
 case AST_CONTROL_OFFHOOK:
 return "Line is off hook";
 case AST_CONTROL_CONGESTION:
 return "Congestion (circuits busy)";
 case AST_CONTROL_FLASH:
 return "Flash hook";
 case AST_CONTROL_WINK:
 return "Wink";
 case AST_CONTROL_OPTION:
 return "Set a low-level option";
 case AST_CONTROL_RADIO_KEY:
 return "Key Radio";
 case AST_CONTROL_RADIO_UNKEY:
 return "Un-Key Radio";
 }
 return "UNKNOWN";
}

static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(ast);
 int res = 0;

 ast_debug(3, "MGCP asked to indicate %d '%s' condition on channel %s\n",
 ind, control2str(ind), ast_channel_name(ast));
 ast_mutex_lock(&sub->lock);
 switch(ind) {
 case AST_CONTROL_RINGING:
#ifdef DLINK_BUGGY_FIRMWARE
 transmit_notify_request(sub, "rt");
#else
 if (!sub->sdpsent) { /* will hide the inband progress!!! */
 transmit_notify_request(sub, sub->parent->ncs ? "L/rt" : "G/rt");
 }
#endif
 break;
 case AST_CONTROL_BUSY:
 transmit_notify_request(sub, "L/bz");
 break;
 case AST_CONTROL_INCOMPLETE:
 /* We do not currently support resetting of the Interdigit Timer, so treat
 * Incomplete control frames as a congestion response
 */
 case AST_CONTROL_CONGESTION:
 transmit_notify_request(sub, sub->parent->ncs ? "L/cg" : "G/cg");
 break;
 case AST_CONTROL_HOLD:
 ast_moh_start(ast, data, NULL);
 break;
 case AST_CONTROL_UNHOLD:
 ast_moh_stop(ast);
 break;
 case AST_CONTROL_SRCUPDATE:
 ast_rtp_instance_update_source(sub->rtp);
 break;
 case AST_CONTROL_SRCCHANGE:
 ast_rtp_instance_change_source(sub->rtp);
 break;
 case AST_CONTROL_PROGRESS:
 case AST_CONTROL_PROCEEDING:
 transmit_modify_request(sub);
 case -1:
 transmit_notify_request(sub, "");
 break;
 default:
 ast_log(LOG_WARNING, "Don't know how to indicate condition %d\n", ind);
 /* fallthrough */
 case AST_CONTROL_PVT_CAUSE_CODE:
 res = -1;
 }
 ast_mutex_unlock(&sub->lock);
 return res;
}

static struct ast_channel *mgcp_new(struct mgcp_subchannel *sub, int state, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor)
{
 struct ast_format_cap *caps = NULL;
 struct ast_channel *tmp;
 struct ast_variable *v = NULL;
 struct mgcp_endpoint *i = sub->parent;
 struct ast_format *tmpfmt;

 caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
 if (!caps) {
 ast_log(LOG_ERROR, "Format capabilities could not be created\n");
 return NULL;
 }
 tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, i->accountcode, i->exten, i->context, assignedids, requestor, i->amaflags, "MGCP/%s@%s-%d", i->name, i->parent->name, sub->id);
 if (!tmp) {
 ast_log(LOG_WARNING, "Channel could not be created\n");
 ao2_ref(caps, -1);
 return NULL;
 }

 ast_channel_stage_snapshot(tmp);
 ast_channel_tech_set(tmp, &mgcp_tech);
 if (ast_format_cap_count(i->cap)) {
 ast_format_cap_append_from_cap(caps, i->cap, AST_MEDIA_TYPE_UNKNOWN);
 } else {
 ast_format_cap_append_from_cap(caps, global_capability, AST_MEDIA_TYPE_UNKNOWN);
 }
 ast_channel_nativeformats_set(tmp, caps);
 ao2_ref(caps, -1);
 if (sub->rtp) {
 ast_channel_set_fd(tmp, 0, ast_rtp_instance_fd(sub->rtp, 0));
 }
 if (i->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID)) {
 i->dsp = ast_dsp_new();
 ast_dsp_set_features(i->dsp, DSP_FEATURE_DIGIT_DETECT);
 /* this is to prevent clipping of dtmf tones during dsp processing */
 ast_dsp_set_digitmode(i->dsp, DSP_DIGITMODE_NOQUELCH);
 } else {
 i->dsp = NULL;
 }
 if (state == AST_STATE_RING) {
 ast_channel_rings_set(tmp, 1);
 }

 tmpfmt = ast_format_cap_get_format(ast_channel_nativeformats(tmp), 0);
 ast_channel_set_writeformat(tmp, tmpfmt);
 ast_channel_set_rawwriteformat(tmp, tmpfmt);
 ast_channel_set_readformat(tmp, tmpfmt);
 ast_channel_set_rawreadformat(tmp, tmpfmt);
 ao2_ref(tmpfmt, -1);
 ast_channel_tech_pvt_set(tmp, sub);
 if (!ast_strlen_zero(i->language))
 ast_channel_language_set(tmp, i->language);
 if (!ast_strlen_zero(i->accountcode))
 ast_channel_accountcode_set(tmp, i->accountcode);
 if (i->amaflags)
 ast_channel_amaflags_set(tmp, i->amaflags);
 mgcp_set_owner(sub, tmp);
 ast_module_ref(ast_module_info->self);
 ast_channel_callgroup_set(tmp, i->callgroup);
 ast_channel_pickupgroup_set(tmp, i->pickupgroup);
 ast_channel_call_forward_set(tmp, i->call_forward);
 ast_channel_context_set(tmp, i->context);
 ast_channel_exten_set(tmp, i->exten);
 /* Don't use ast_set_callerid() here because it will
 * generate a needless NewCallerID event */
 if (!ast_strlen_zero(i->cid_num)) {
 ast_channel_caller(tmp)->ani.number.valid = 1;
 ast_channel_caller(tmp)->ani.number.str = ast_strdup(i->cid_num);
 }

 if (!i->adsi) {
 ast_channel_adsicpe_set(tmp, AST_ADSI_UNAVAILABLE);
 }
 ast_channel_priority_set(tmp, 1);

 /* Set channel variables for this call from configuration */
 for (v = i->chanvars ; v ; v = v->next) {
 char valuebuf[1024];
 pbx_builtin_setvar_helper(tmp, v->name, ast_get_encoded_str(v->value, valuebuf, sizeof(valuebuf)));
 }

 if (sub->rtp) {
 ast_jb_configure(tmp, &global_jbconf);
 }

 ast_channel_stage_snapshot_done(tmp);
 ast_channel_unlock(tmp);

 if (state != AST_STATE_DOWN) {
 if (ast_pbx_start(tmp)) {
 ast_log(LOG_WARNING, "Unable to start PBX on %s\n", ast_channel_name(tmp));
 ast_hangup(tmp);
 tmp = NULL;
 }
 }
 ast_verb(3, "MGCP mgcp_new(%s) created in state: %s\n",
 ast_channel_name(tmp), ast_state2str(state));

 return tmp;
}

static char *get_sdp_by_line(char* line, char *name, int nameLen)
{
 if (strncasecmp(line, name, nameLen) == 0 && line[nameLen] == '=') {
 char *r = line + nameLen + 1;
 while (*r && (*r < 33)) ++r;
 return r;
 }
 return "";
}

static char *get_sdp(struct mgcp_request *req, char *name)
{
 int x;
 int len = strlen(name);
 char *r;

 for (x = 0; x < req->lines; x++) {
 r = get_sdp_by_line(req->line[x], name, len);
 if (r[0] != '\0') return r;
 }
 return "";
}

static void sdpLineNum_iterator_init(int *iterator)
{
 *iterator = 0;
}

static char *get_sdp_iterate(int* iterator, struct mgcp_request *req, char *name)
{
 int len = strlen(name);
 char *r;
 while (*iterator < req->lines) {
 r = get_sdp_by_line(req->line[(*iterator)++], name, len);
 if (r[0] != '\0') return r;
 }
 return "";
}

static char *__get_header(struct mgcp_request *req, char *name, int *start, char *def)
{
 int x;
 int len = strlen(name);
 char *r;
 for (x = *start; x < req->headers; x++) {
 if (!strncasecmp(req->header[x], name, len) &&
 (req->header[x][len] == ':')) {
 r = req->header[x] + len + 1;
 while (*r && (*r < 33)) {
 r++;
 }
 *start = x + 1;
 return r;
 }
 }
 /* Don't return NULL, so get_header is always a valid pointer */
 return def;
}

static char *get_header(struct mgcp_request *req, char *name)
{
 int start = 0;
 return __get_header(req, name, &start, "");
}

/*! \brief get_csv: (SC:) get comma separated value */
static char *get_csv(char *c, int *len, char **next)
{
 char *s;

 *next = NULL, *len = 0;
 if (!c) return NULL;

 while (*c && (*c < 33 || *c == ',')) {
 c++;
 }

 s = c;
 while (*c && (*c >= 33 && *c != ',')) {
 c++, (*len)++;
 }
 *next = c;

 if (*len == 0) {
 s = NULL, *next = NULL;
 }

 return s;
}

static struct mgcp_gateway *find_realtime_gw(char *name, char *at, struct sockaddr_in *sin)
{
 struct mgcp_gateway *g = NULL;
 struct ast_variable *mgcpgwconfig = NULL;
 struct ast_variable *gwv, *epname = NULL;
 struct mgcp_endpoint *e;
 char lines[256];
 int i, j;

 ast_debug(1, "*** find Realtime MGCPGW\n");

 if (!(i = ast_check_realtime("mgcpgw")) || !(j = ast_check_realtime("mgcpep"))) {
 return NULL;
 }

 if (ast_strlen_zero(at)) {
 ast_debug(1, "null gw name\n");
 return NULL;
 }

 if (!(mgcpgwconfig = ast_load_realtime("mgcpgw", "name", at, NULL))) {
 return NULL;
 }

 /*!
 * \note This is a fairly odd way of instantiating lines. Instead of each
 * line created by virtue of being in the database (and loaded via
 * ast_load_realtime_multientry), this code forces a specific order with a
 * "lines" entry in the "mgcpgw" record. This has benefits, because as with
 * chan_dahdi, values are inherited across definitions. The downside is
 * that it's not as clear what the values will be simply by looking at a
 * single row in the database, and it's probable that the sanest configuration
 * should have the first column in the "mgcpep" table be "clearvars", with a
 * static value of "all", if any variables are set at all. It may be worth
 * making this assumption explicit in the code in the future, and then just
 * using ast_load_realtime_multientry for the "mgcpep" records.
 */
 lines[0] = '\0';
 for (gwv = mgcpgwconfig; gwv; gwv = gwv->next) {
 if (!strcasecmp(gwv->name, "lines")) {
 ast_copy_string(lines, gwv->value, sizeof(lines));
 break;
 }
 }
 /* Position gwv at the end of the list */
 for (gwv = gwv && gwv->next ? gwv : mgcpgwconfig; gwv->next; gwv = gwv->next);

 if (!ast_strlen_zero(lines)) {
 AST_DECLARE_APP_ARGS(args,
 AST_APP_ARG(line)[100];
 );
 AST_STANDARD_APP_ARGS(args, lines);
 for (i = 0; i < args.argc; i++) {
 gwv->next = ast_load_realtime("mgcpep", "name", at, "line", args.line[i], NULL);

 /* Remove "line" AND position gwv at the end of the list. */
 for (epname = NULL; gwv->next; gwv = gwv->next) {
 if (!strcasecmp(gwv->next->name, "line")) {
 /* Remove it from the list */
 epname = gwv->next;
 gwv->next = gwv->next->next;
 }
 }
 /* Since "line" instantiates the configuration, we have to move it to the end. */
 if (epname) {
 gwv->next = epname;
 epname->next = NULL;
 gwv = gwv->next;
 }
 }
 }
 for (gwv = mgcpgwconfig; gwv; gwv = gwv->next) {
 ast_debug(1, "MGCP Realtime var: %s => %s\n", gwv->name, gwv->value);
 }

 if (mgcpgwconfig) {
 g = build_gateway(at, mgcpgwconfig);
 ast_variables_destroy(mgcpgwconfig);
 }
 if (g) {
 g->next = gateways;
 g->realtime = 1;
 gateways = g;
 for (e = g->endpoints; e; e = e->next) {
 transmit_audit_endpoint(e);
 e->needaudit = 0;
 }
 }
 return g;
}

static struct mgcp_subchannel *find_subchannel_and_lock(char *name, int msgid, struct sockaddr_in *sin)
{
 struct mgcp_endpoint *p = NULL;
 struct mgcp_subchannel *sub = NULL;
 struct mgcp_gateway *g;
 char tmp[256] = "";
 char *at = NULL, *c;
 int found = 0;
 if (name) {
 ast_copy_string(tmp, name, sizeof(tmp));
 at = strchr(tmp, '@');
 if (!at) {
 ast_log(LOG_NOTICE, "Endpoint '%s' has no at sign!\n", name);
 return NULL;
 }
 *at++ = '\0';
 }
 ast_mutex_lock(&gatelock);
 if (at && (at[0] == '[')) {
 at++;
 c = strrchr(at, ']');
 if (c) {
 *c = '\0';
 }
 }
 for (g = gateways ? gateways : find_realtime_gw(name, at, sin); g; g = g->next ? g->next : find_realtime_gw(name, at, sin)) {
 if ((!name || !strcasecmp(g->name, at)) &&
 (sin || g->addr.sin_addr.s_addr || g->defaddr.sin_addr.s_addr)) {
 /* Found the gateway. If it's dynamic, save it's address -- now for the endpoint */
 if (sin && g->dynamic && name) {
 if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
 (g->addr.sin_port != sin->sin_port)) {
 memcpy(&g->addr, sin, sizeof(g->addr));
 {
 struct ast_sockaddr tmp1, tmp2;
 struct sockaddr_in tmp3 = {0,};

 tmp3.sin_addr = g->ourip;
 ast_sockaddr_from_sin(&tmp1, &g->addr);
 ast_sockaddr_from_sin(&tmp2, &tmp3);
 if (ast_ouraddrfor(&tmp1, &tmp2)) {
 memcpy(&g->ourip, &__ourip, sizeof(g->ourip));
 }
 ast_sockaddr_to_sin(&tmp2, &tmp3);
 g->ourip = tmp3.sin_addr;
 }
 ast_verb(3, "Registered MGCP gateway '%s' at %s port %d\n", g->name, ast_inet_ntoa(g->addr.sin_addr), ntohs(g->addr.sin_port));
 }
 /* not dynamic, check if the name matches */
 } else if (name) {
 if (strcasecmp(g->name, at)) {
 continue;
 }
 /* not dynamic, no name, check if the addr matches */
 } else if (!name && sin) {
 if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
 (g->addr.sin_port != sin->sin_port)) {
 continue;
 }
 } else {
 continue;
 }
 for (p = g->endpoints; p; p = p->next) {
 ast_debug(1, "Searching on %s@%s for subchannel\n", p->name, g->name);
 if (msgid) {
 sub = p->sub;
 found = 1;
 break;
 } else if (name && !strcasecmp(p->name, tmp)) {
 ast_debug(1, "Coundn't determine subchannel, assuming current master %s@%s-%d\n",
 p->name, g->name, p->sub->id);
 sub = p->sub;
 found = 1;
 break;
 }
 }
 if (sub && found) {
 ast_mutex_lock(&sub->lock);
 break;
 }
 }
 }
 ast_mutex_unlock(&gatelock);
 if (!sub) {
 if (name) {
 if (g) {
 ast_log(LOG_NOTICE, "Endpoint '%s' not found on gateway '%s'\n", tmp, at);
 } else {
 ast_log(LOG_NOTICE, "Gateway '%s' (and thus its endpoint '%s') does not exist\n", at, tmp);
 }
 }
 }
 return sub;
}

static void parse(struct mgcp_request *req)
{
 /* Divide fields by NULL's */
 char *c;
 int f = 0;
 c = req->data;

 /* First header starts immediately */
 req->header[f] = c;
 for (; *c; c++) {
 if (*c == '\n') {
 /* We've got a new header */
 *c = 0;
 ast_debug(3, "Header: %s (%d)\n", req->header[f], (int) strlen(req->header[f]));
 if (ast_strlen_zero(req->header[f])) {
 /* Line by itself means we're now in content */
 c++;
 break;
 }
 if (f >= MGCP_MAX_HEADERS - 1) {
 ast_log(LOG_WARNING, "Too many MGCP headers...\n");
 } else {
 f++;
 }
 req->header[f] = c + 1;
 } else if (*c == '\r') {
 /* Ignore but eliminate \r's */
 *c = 0;
 }
 }
 /* Check for last header */
 if (!ast_strlen_zero(req->header[f])) {
 f++;
 }
 req->headers = f;
 /* Now we process any mime content */
 f = 0;
 req->line[f] = c;
 for (; *c; c++) {
 if (*c == '\n') {
 /* We've got a new line */
 *c = 0;
 ast_debug(3, "Line: %s (%d)\n", req->line[f], (int) strlen(req->line[f]));
 if (f >= MGCP_MAX_LINES - 1) {
 ast_log(LOG_WARNING, "Too many SDP lines...\n");
 } else {
 f++;
 }
 req->line[f] = c + 1;
 } else if (*c == '\r') {
 /* Ignore and eliminate \r's */
 *c = 0;
 }
 }
 /* Check for last line */
 if (!ast_strlen_zero(req->line[f])) {
 f++;
 }
 req->lines = f;
 /* Parse up the initial header */
 c = req->header[0];
 while (*c && *c < 33) c++;
 /* First the verb */
 req->verb = c;
 while (*c && (*c > 32)) c++;
 if (*c) {
 *c = '\0';
 c++;
 while (*c && (*c < 33)) c++;
 req->identifier = c;
 while (*c && (*c > 32)) c++;
 if (*c) {
 *c = '\0';
 c++;
 while (*c && (*c < 33)) c++;
 req->endpoint = c;
 while (*c && (*c > 32)) c++;
 if (*c) {
 *c = '\0';
 c++;
 while (*c && (*c < 33)) c++;
 req->version = c;
 while (*c && (*c > 32)) c++;
 while (*c && (*c < 33)) c++;
 while (*c && (*c > 32)) c++;
 *c = '\0';
 }
 }
 }

 ast_debug(1, "Verb: '%s', Identifier: '%s', Endpoint: '%s', Version: '%s'\n",
 req->verb, req->identifier, req->endpoint, req->version);
 ast_debug(1, "%d headers, %d lines\n", req->headers, req->lines);
 if (*c) {
 ast_log(LOG_WARNING, "Odd content, extra stuff left over ('%s')\n", c);
 }
}

static int process_sdp(struct mgcp_subchannel *sub, struct mgcp_request *req)
{
 char *m;
 char *c;
 char *a;
 char host[258];
 int len = 0;
 int portno;
 struct ast_format_cap *peercap;
 int peerNonCodecCapability;
 struct sockaddr_in sin;
 struct ast_sockaddr sin_tmp;
 char *codecs;
 struct ast_hostent ahp; struct hostent *hp;
 int codec, codec_count=0;
 int iterator;
 struct mgcp_endpoint *p = sub->parent;
 struct ast_str *global_buf = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
 struct ast_str *peer_buf = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
 struct ast_str *pvt_buf = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);

 /* Get codec and RTP info from SDP */
 m = get_sdp(req, "m");
 c = get_sdp(req, "c");
 if (ast_strlen_zero(m) || ast_strlen_zero(c)) {
 ast_log(LOG_WARNING, "Insufficient information for SDP (m = '%s', c = '%s')\n", m, c);
 return -1;
 }
 if (sscanf(c, "IN IP4 %256s", host) != 1) {
 ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c);
 return -1;
 }
 /* XXX This could block for a long time, and block the main thread! XXX */
 hp = ast_gethostbyname(host, &ahp);
 if (!hp) {
 ast_log(LOG_WARNING, "Unable to lookup host in c= line, '%s'\n", c);
 return -1;
 }
 if (sscanf(m, "audio %30d RTP/AVP %n", &portno, &len) != 1 || !len) {
 ast_log(LOG_WARNING, "Malformed media stream descriptor: %s\n", m);
 return -1;
 }
 sin.sin_family = AF_INET;
 memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
 sin.sin_port = htons(portno);
 ast_sockaddr_from_sin(&sin_tmp, &sin);
 ast_rtp_instance_set_remote_address(sub->rtp, &sin_tmp);
 ast_debug(3, "Peer RTP is at port %s:%d\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
 /* Scan through the RTP payload types specified in a "m=" line: */
 codecs = ast_strdupa(m + len);
 while (!ast_strlen_zero(codecs)) {
 if (sscanf(codecs, "%30d%n", &codec, &len) != 1) {
 if (codec_count) {
 break;
 }
 ast_log(LOG_WARNING, "Error in codec string '%s' at '%s'\n", m, codecs);
 return -1;
 }
 ast_rtp_codecs_payloads_set_m_type(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp, codec);
 codec_count++;
 codecs += len;
 }

 /* Next, scan through each "a=rtpmap:" line, noting each */
 /* specified RTP payload type (with corresponding MIME subtype): */
 sdpLineNum_iterator_init(&iterator);
 while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
 char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
 if (sscanf(a, "rtpmap: %30d %127[^/]/", &codec, mimeSubtype) != 2)
 continue;
 /* Note: should really look at the 'freq' and '#chans' params too */
 ast_rtp_codecs_payloads_set_rtpmap_type(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp, codec, "audio", mimeSubtype, 0);
 }

 /* Now gather all of the codecs that were asked for: */
 if (!(peercap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
 return -1;
 }
 ast_rtp_codecs_payload_formats(ast_rtp_instance_get_codecs(sub->rtp), peercap, &peerNonCodecCapability);
 ast_format_cap_get_compatible(global_capability, peercap, p->cap);
 ast_debug(1, "Capabilities: us - %s, them - %s, combined - %s\n",
 ast_format_cap_get_names(global_capability, &global_buf),
 ast_format_cap_get_names(peercap, &peer_buf),
 ast_format_cap_get_names(p->cap, &pvt_buf));
 ao2_ref(peercap, -1);

 ast_debug(1, "Non-codec capabilities: us - %d, them - %d, combined - %d\n",
 nonCodecCapability, peerNonCodecCapability, p->nonCodecCapability);
 if (!ast_format_cap_count(p->cap)) {
 ast_log(LOG_WARNING, "No compatible codecs!\n");
 return -1;
 }
 return 0;
}

static int add_header(struct mgcp_request *req, const char *var, const char *value)
{
 if (req->len >= sizeof(req->data) - 4) {
 ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
 return -1;
 }
 if (req->lines) {
 ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n");
 return -1;
 }
 req->header[req->headers] = req->data + req->len;
 snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s: %s\r\n", var, value);
 req->len += strlen(req->header[req->headers]);
 if (req->headers < MGCP_MAX_HEADERS) {
 req->headers++;
 } else {
 ast_log(LOG_WARNING, "Out of header space\n");
 return -1;
 }
 return 0;
}

static int add_line(struct mgcp_request *req, char *line)
{
 if (req->len >= sizeof(req->data) - 4) {
 ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
 return -1;
 }
 if (!req->lines) {
 /* Add extra empty return */
 ast_copy_string(req->data + req->len, "\r\n", sizeof(req->data) - req->len);
 req->len += strlen(req->data + req->len);
 }
 req->line[req->lines] = req->data + req->len;
 snprintf(req->line[req->lines], sizeof(req->data) - req->len, "%s", line);
 req->len += strlen(req->line[req->lines]);
 if (req->lines < MGCP_MAX_LINES) {
 req->lines++;
 } else {
 ast_log(LOG_WARNING, "Out of line space\n");
 return -1;
 }
 return 0;
}

static int init_resp(struct mgcp_request *req, char *resp, struct mgcp_request *orig, char *resprest)
{
 /* Initialize a response */
 if (req->headers || req->len) {
 ast_log(LOG_WARNING, "Request already initialized?!?\n");
 return -1;
 }
 req->header[req->headers] = req->data + req->len;
 snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %s %s\r\n", resp, orig->identifier, resprest);
 req->len += strlen(req->header[req->headers]);
 if (req->headers < MGCP_MAX_HEADERS) {
 req->headers++;
 } else {
 ast_log(LOG_WARNING, "Out of header space\n");
 }
 return 0;
}

static int init_req(struct mgcp_endpoint *p, struct mgcp_request *req, char *verb, unsigned int oseq)
{
 /* Initialize a response */
 if (req->headers || req->len) {
 ast_log(LOG_WARNING, "Request already initialized?!?\n");
 return -1;
 }
 req->header[req->headers] = req->data + req->len;
 /* check if we need brackets around the gw name */
 if (p->parent->isnamedottedip) {
 snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %u %s@[%s] MGCP 1.0%s\r\n", verb, oseq, p->name, p->parent->name, p->ncs ? " NCS 1.0" : "");
 } else {
+ snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %u %s@%s MGCP 1.0%s\r\n", verb, oseq, p->name, p->parent->name, p->ncs ? " NCS 1.0" : "");
 }
 req->len += strlen(req->header[req->headers]);
 if (req->headers < MGCP_MAX_HEADERS) {
 req->headers++;
 } else {
 ast_log(LOG_WARNING, "Out of header space\n");
 }
 return 0;
}


static int respprep(struct mgcp_request *resp, struct mgcp_endpoint *p, char *msg, struct mgcp_request *req, char *msgrest)
{
 memset(resp, 0, sizeof(*resp));
 init_resp(resp, msg, req, msgrest);
 return 0;
}

static int reqprep(struct mgcp_request *req, struct mgcp_endpoint *p, char *verb)
{
 unsigned int oseq;
 memset(req, 0, sizeof(struct mgcp_request));
 ast_mutex_lock(&oseq_lock);
 oseq_global++;
 if (oseq_global > 999999999) {
 oseq_global = 1;
 }
 oseq = oseq_global;
 ast_mutex_unlock(&oseq_lock);
 init_req(p, req, verb, oseq);
 return oseq;
}

static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest)
{
 struct mgcp_request resp;
 struct mgcp_endpoint *p = sub->parent;
 struct mgcp_response *mgr;

 if (!sub) {
 return -1;
 }

 respprep(&resp, p, msg, req, msgrest);
 if (!(mgr = ast_calloc(1, sizeof(*mgr) + resp.len + 1))) {
 return send_response(sub, &resp);
 }
 /* Store MGCP response in case we have to retransmit */
 sscanf(req->identifier, "%30d", &mgr->seqno);
 time(&mgr->whensent);
 mgr->len = resp.len;
 memcpy(mgr->buf, resp.data, resp.len);
 mgr->buf[resp.len] = '\0';
 mgr->next = p->parent->responses;
 p->parent->responses = mgr;

 return send_response(sub, &resp);
}


static int add_sdp(struct mgcp_request *resp, struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp)
{
 int len;
 int codec;
 char costr[80];
 struct sockaddr_in sin;
 struct ast_sockaddr sin_tmp;
 char v[256];
 char s[256];
 char o[256];
 char c[256];
 char t[256];
 char m[256] = "";
 char a[1024] = "";
 int x;
 struct sockaddr_in dest = { 0, };
 struct ast_sockaddr dest_tmp;
 struct mgcp_endpoint *p = sub->parent;
 /* XXX We break with the "recommendation" and send our IP, in order that our
 peer doesn't have to ast_gethostbyname() us XXX */
 len = 0;
 if (!sub->rtp) {
 ast_log(LOG_WARNING, "No way to add SDP without an RTP structure\n");
 return -1;
 }
 ast_rtp_instance_get_local_address(sub->rtp, &sin_tmp);
 ast_sockaddr_to_sin(&sin_tmp, &sin);
 if (rtp) {
 ast_rtp_instance_get_remote_address(sub->rtp, &dest_tmp);
 ast_sockaddr_to_sin(&dest_tmp, &dest);
 } else {
 if (sub->tmpdest.sin_addr.s_addr) {
 dest.sin_addr = sub->tmpdest.sin_addr;
 dest.sin_port = sub->tmpdest.sin_port;
 /* Reset temporary destination */
 memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
 } else {
 dest.sin_addr = p->parent->ourip;
 dest.sin_port = sin.sin_port;
 }
 }
 ast_debug(1, "We're at %s port %d\n", ast_inet_ntoa(p->parent->ourip), ntohs(sin.sin_port));
 ast_copy_string(v, "v=0\r\n", sizeof(v));
 snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", (int)getpid(), (int)getpid(), ast_inet_ntoa(dest.sin_addr));
 ast_copy_string(s, "s=session\r\n", sizeof(s));
 snprintf(c, sizeof(c), "c=IN IP4 %s\r\n", ast_inet_ntoa(dest.sin_addr));
 ast_copy_string(t, "t=0 0\r\n", sizeof(t));
 snprintf(m, sizeof(m), "m=audio %d RTP/AVP", ntohs(dest.sin_port));

 for (x = 0; x < ast_format_cap_count(p->cap); x++) {
 struct ast_format *format = ast_format_cap_get_format(p->cap, x);

 if (ast_format_get_type(format) != AST_MEDIA_TYPE_AUDIO) {
 ao2_ref(format, -1);
 continue;
 }

 ast_debug(1, "Answering with capability %s\n", ast_format_get_name(format));
 codec = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(sub->rtp), 1, format, 0);
 if (codec > -1) {
 snprintf(costr, sizeof(costr), " %d", codec);
 strncat(m, costr, sizeof(m) - strlen(m) - 1);
 snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype2(1, format, 0, 0));
 strncat(a, costr, sizeof(a) - strlen(a) - 1);
 }

 ao2_ref(format, -1);
 }

 for (x = 1LL; x <= AST_RTP_MAX; x <<= 1) {
 if (p->nonCodecCapability & x) {
 ast_debug(1, "Answering with non-codec capability %d\n", (int) x);
 codec = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(sub->rtp), 0, NULL, x);
 if (codec > -1) {
 snprintf(costr, sizeof(costr), " %d", codec);
 strncat(m, costr, sizeof(m) - strlen(m) - 1);
 snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype2(0, NULL, x, 0));
 strncat(a, costr, sizeof(a) - strlen(a) - 1);
 if (x == AST_RTP_DTMF) {
 /* Indicate we support DTMF... Not sure about 16,
 but MSN supports it so dang it, we will too... */
 snprintf(costr, sizeof costr, "a=fmtp:%d 0-16\r\n", codec);
 strncat(a, costr, sizeof(a) - strlen(a) - 1);
 }
 }
 }
 }
 strncat(m, "\r\n", sizeof(m) - strlen(m) - 1);
 len = strlen(v) + strlen(s) + strlen(o) + strlen(c) + strlen(t) + strlen(m) + strlen(a);
 snprintf(costr, sizeof(costr), "%d", len);
 add_line(resp, v);
 add_line(resp, o);
 add_line(resp, s);
 add_line(resp, c);
 add_line(resp, t);
 add_line(resp, m);
 add_line(resp, a);
 return 0;
}

static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp, const struct ast_format_cap *codecs)
{
 struct mgcp_request resp;
 char local[256];
 char tmp[80];
 struct mgcp_endpoint *p = sub->parent;
 int i;
 struct ast_sockaddr sub_tmpdest_tmp;
 unsigned int oseq;

 if (ast_strlen_zero(sub->cxident) && rtp) {
 /* We don't have a CXident yet, store the destination and
 wait a bit */
 ast_rtp_instance_get_remote_address(rtp, &sub_tmpdest_tmp);
 ast_sockaddr_to_sin(&sub_tmpdest_tmp, &sub->tmpdest);
 return 0;
 }
 ast_copy_string(local, "e:on, s:off, p:20", sizeof(local));

 for (i = 0; i < ast_format_cap_count(p->cap); i++) {
 struct ast_format *format = ast_format_cap_get_format(p->cap, i);

 if (ast_format_get_type(format) != AST_MEDIA_TYPE_AUDIO) {
 ao2_ref(format, -1);
 continue;
 }

 snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, format, 0, 0));
 strncat(local, tmp, sizeof(local) - strlen(local) - 1);

 ao2_ref(format, -1);
 }

 if (sub->gate) {
 if (sub->gate->state == GATE_ALLOCATED || sub->gate->state == GATE_OPEN) {
 snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
 strncat(local, tmp, sizeof(local) - strlen(local) - 1);
 sub->sdpsent = 1;
 } else {
 /* oops wait */
 ast_debug(1, "Waiting for opened gate...\n");
 sub->sdpsent = 0;
 return 0;
 }
 }


 oseq = reqprep(&resp, p, "MDCX");
 add_header(&resp, "C", sub->callid);
 add_header(&resp, "L", local);
 add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
 /* X header should not be sent. kept for compatibility */
 add_header(&resp, "X", sub->txident);
 add_header(&resp, "I", sub->cxident);
 /*add_header(&resp, "S", "");*/
 add_sdp(&resp, sub, rtp);
 /* fill in new fields */
 resp.cmd = MGCP_CMD_MDCX;
 resp.trid = oseq;
 return send_request(p, sub, &resp, oseq);
}

static int transmit_connect_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp)
{
 struct mgcp_request resp;
 char local[256];
 char tmp[80];
 int i;
 struct mgcp_endpoint *p = sub->parent;
 unsigned int oseq;

 ast_debug(3, "Creating connection for %s@%s-%d in cxmode: %s callid: %s\n",
 p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);

 ast_copy_string(local, "e:on, s:off, p:20", sizeof(local));

 for (i = 0; i < ast_format_cap_count(p->cap); i++) {
 struct ast_format *format = ast_format_cap_get_format(p->cap, i);

 if (ast_format_get_type(format) != AST_MEDIA_TYPE_AUDIO) {
 ao2_ref(format, -1);
 continue;
 }

 snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, format, 0, 0));
 strncat(local, tmp, sizeof(local) - strlen(local) - 1);

 ao2_ref(format, -1);
 }

 if (sub->gate) {
 if(sub->gate->state == GATE_ALLOCATED) {
 snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
 strncat(local, tmp, sizeof(local) - strlen(local) - 1);
 }
 }
 sub->sdpsent = 1;
 oseq = reqprep(&resp, p, "CRCX");
 add_header(&resp, "C", sub->callid);
 add_header(&resp, "L", local);
 add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
 /* X header should not be sent. kept for compatibility */
 add_header(&resp, "X", sub->txident);
 /*add_header(&resp, "S", "");*/
 add_sdp(&resp, sub, rtp);
 /* fill in new fields */
 resp.cmd = MGCP_CMD_CRCX;
 resp.trid = oseq;
 return send_request(p, sub, &resp, oseq);
}

static int mgcp_pktcgate_remove(struct cops_gate *gate)
{
 struct mgcp_subchannel *sub = gate->tech_pvt;

 if (!sub) {
 return 1;
 }

 ast_mutex_lock(&sub->lock);
 ast_debug(1, "Pktc: gate 0x%x deleted\n", gate->gateid);
 if (sub->gate->state != GATE_CLOSED && sub->parent->hangupongateremove) {
 sub->gate = NULL;
 if (sub->owner) {
 ast_softhangup(sub->owner, AST_CAUSE_REQUESTED_CHAN_UNAVAIL);
 ast_channel_unlock(sub->owner);
 }
 } else {
 sub->gate = NULL;
 }
 ast_mutex_unlock(&sub->lock);
 return 1;
}

static int mgcp_pktcgate_open(struct cops_gate *gate)
{
 struct mgcp_subchannel *sub = gate->tech_pvt;
 if (!sub) {
 return 1;
 }
 ast_mutex_lock(&sub->lock);
 ast_debug(1, "Pktc: gate 0x%x open\n", gate->gateid);
 if (!sub->sdpsent) transmit_modify_with_sdp(sub, NULL, 0);
 ast_mutex_unlock(&sub->lock);
 return 1;
}

static int mgcp_alloc_pktcgate(struct mgcp_subchannel *sub)
{
 struct mgcp_endpoint *p = sub->parent;
 sub->gate = ast_pktccops_gate_alloc(GATE_SET, NULL, ntohl(p->parent->addr.sin_addr.s_addr),
 8, 128000, 232, 0, 0, NULL, &mgcp_pktcgate_remove);

 if (!sub->gate) {
 return 0;
 }
 sub->gate->tech_pvt = sub;
 sub->gate->gate_open = &mgcp_pktcgate_open;
 return 1;
}

static int transmit_connect(struct mgcp_subchannel *sub)
{
 struct mgcp_request resp;
 int x;
 char local[256];
 char tmp[80];
 struct ast_format *tmpfmt;
 struct mgcp_endpoint *p = sub->parent;
 unsigned int oseq;

 ast_copy_string(local, "p:20, s:off, e:on", sizeof(local));

 for (x = 0; x < ast_format_cap_count(p->cap); x++) {
 tmpfmt = ast_format_cap_get_format(p->cap, x);

 snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, tmpfmt, 0, 0));
 strncat(local, tmp, sizeof(local) - strlen(local) - 1);

 ao2_ref(tmpfmt, -1);
 }

 ast_debug(3, "Creating connection for %s@%s-%d in cxmode: %s callid: %s\n",
 p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
 sub->sdpsent = 0;
 oseq = reqprep(&resp, p, "CRCX");
 add_header(&resp, "C", sub->callid);
 add_header(&resp, "L", local);
 add_header(&resp, "M", "inactive");
 /* X header should not be sent. kept for compatibility */
 add_header(&resp, "X", sub->txident);
 /*add_header(&resp, "S", "");*/
 /* fill in new fields */
 resp.cmd = MGCP_CMD_CRCX;
 resp.trid = oseq;
 return send_request(p, sub, &resp, oseq);
}

static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone)
{
 struct mgcp_request resp;
 struct mgcp_endpoint *p = sub->parent;
 unsigned int oseq;

 ast_debug(3, "MGCP Asked to indicate tone: %s on %s@%s-%d in cxmode: %s\n",
 tone, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
 ast_copy_string(p->curtone, tone, sizeof(p->curtone));
 oseq = reqprep(&resp, p, "RQNT");
 add_header(&resp, "X", p->rqnt_ident);
 switch (p->hookstate) {
 case MGCP_ONHOOK:
 add_header(&resp, "R", "L/hd(N)");
 break;
 case MGCP_OFFHOOK:
 add_header_offhook(sub, &resp, tone);
 break;
 }
 if (!ast_strlen_zero(tone)) {
 add_header(&resp, "S", tone);
 }
 /* fill in new fields */
 resp.cmd = MGCP_CMD_RQNT;
 resp.trid = oseq;
 return send_request(p, NULL, &resp, oseq);
}

static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername)
{
 struct mgcp_request resp;
 char tone2[256];
 char *l, *n;
 struct timeval t = ast_tvnow();
 struct ast_tm tm;
 struct mgcp_endpoint *p = sub->parent;
 unsigned int oseq;

 ast_localtime(&t, &tm, NULL);
 n = callername;
 l = callernum;
 if (!n)
 n = "";
 if (!l)
 l = "";

 /* Keep track of last callerid for blacklist and callreturn */
 ast_copy_string(p->lastcallerid, l, sizeof(p->lastcallerid));

 snprintf(tone2, sizeof(tone2), "%s,L/ci(%02d/%02d/%02d/%02d,%s,%s)", tone,
 tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, l, n);
 ast_copy_string(p->curtone, tone, sizeof(p->curtone));
 oseq = reqprep(&resp, p, "RQNT");
 add_header(&resp, "X", p->rqnt_ident);
 switch (p->hookstate) {
 case MGCP_ONHOOK:
 add_header(&resp, "R", "L/hd(N)");
 break;
 case MGCP_OFFHOOK:
 add_header_offhook(sub, &resp, tone);
 break;
 }
 if (!ast_strlen_zero(tone2)) {
 add_header(&resp, "S", tone2);
 }
 ast_debug(3, "MGCP Asked to indicate tone: %s on %s@%s-%d in cxmode: %s\n",
 tone2, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
 /* fill in new fields */
 resp.cmd = MGCP_CMD_RQNT;
 resp.trid = oseq;
 return send_request(p, NULL, &resp, oseq);
}

static int transmit_modify_request(struct mgcp_subchannel *sub)
{
 struct mgcp_request resp;
 struct mgcp_endpoint *p = sub->parent;
 int i;
 int fc = 1;
 char local[256];
 char tmp[80];
 unsigned int oseq;

 if (ast_strlen_zero(sub->cxident)) {
 /* We don't have a CXident yet, store the destination and
 wait a bit */
 return 0;
 }
 ast_debug(3, "Modified %s@%s-%d with new mode: %s on callid: %s\n",
 p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);

 ast_copy_string(local, "", sizeof(local));
 for (i = 0; i < ast_format_cap_count(p->cap); i++) {
 struct ast_format *format = ast_format_cap_get_format(p->cap, i);

 if (p->ncs && !fc) {
 ast_format_cap_remove_by_type(p->cap, AST_MEDIA_TYPE_UNKNOWN);
 ast_format_cap_append(p->cap, format, 0); /* sb5120e bug */
 ao2_ref(format, -1);
 break;
 } else {
 fc = 0;
 snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, format, 0, 0));
 }
 strncat(local, tmp, sizeof(local) - strlen(local) - 1);

 ao2_ref(format, -1);
 }

 if (!sub->sdpsent) {
 if (sub->gate) {
 if (sub->gate->state == GATE_ALLOCATED || sub->gate->state == GATE_OPEN) {
 snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
 strncat(local, tmp, sizeof(local) - strlen(local) - 1);
 } else {
 /* we still don't have gateid wait */
 return 0;
 }
 }
 }

 oseq = reqprep(&resp, p, "MDCX");
 add_header(&resp, "C", sub->callid);
 if (!sub->sdpsent) {
 add_header(&resp, "L", local);
 }
 add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
 /* X header should not be sent. kept for compatibility */
 add_header(&resp, "X", sub->txident);
 add_header(&resp, "I", sub->cxident);
 switch (sub->parent->hookstate) {
 case MGCP_ONHOOK:
 add_header(&resp, "R", "L/hd(N)");
 break;
 case MGCP_OFFHOOK:
 add_header_offhook(sub, &resp, "");
 break;
 }
 if (!sub->sdpsent) {
 add_sdp(&resp, sub, NULL);
 sub->sdpsent = 1;
 }
 /* fill in new fields */
 resp.cmd = MGCP_CMD_MDCX;
 resp.trid = oseq;
 return send_request(p, sub, &resp, oseq);
}


static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp, char *tone)
{
 struct mgcp_endpoint *p = sub->parent;
 char tone_indicate_end = 0;

 /* We also should check the tone to indicate, because it have no sense
 to request notify D/[0-9#*] (dtmf keys) if we are sending congestion
 tone for example G/cg */
 if (p && (!strcasecmp(tone, (p->ncs ? "L/ro" : "G/cg")))) {
 tone_indicate_end = 1;
 }

 if (p && p->sub && p->sub->owner &&
 ast_channel_state(p->sub->owner) >= AST_STATE_RINGING &&
 (p->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID))) {
 add_header(resp, "R", "L/hu(N),L/hf(N)");

 } else if (!tone_indicate_end){
 add_header(resp, "R", (p->ncs ? "L/hu(N),L/hf(N),L/[0-9#*](N)" : "L/hu(N),L/hf(N),D/[0-9#*](N)"));
 } else {
 ast_debug(1, "We don't want more digits if we will end the call\n");
 add_header(resp, "R", "L/hu(N),L/hf(N)");
 }
}




static int transmit_audit_endpoint(struct mgcp_endpoint *p)
{
 struct mgcp_request resp;
 unsigned int oseq;
 oseq = reqprep(&resp, p, "AUEP");
 /* removed unknown param VS */
 /*add_header(&resp, "F", "A,R,D,S,X,N,I,T,O,ES,E,MD,M");*/
 add_header(&resp, "F", "A");
 /* fill in new fields */
 resp.cmd = MGCP_CMD_AUEP;
 resp.trid = oseq;
 return send_request(p, NULL, &resp, oseq);
}

static int transmit_connection_del(struct mgcp_subchannel *sub)
{
 struct mgcp_endpoint *p = sub->parent;
 struct mgcp_request resp;
 unsigned int oseq;

 ast_debug(3, "Delete connection %s %s@%s-%d with new mode: %s on callid: %s\n",
 sub->cxident, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
 oseq = reqprep(&resp, p, "DLCX");
 /* check if call id is avail */
 if (sub->callid[0])
 add_header(&resp, "C", sub->callid);
 /* X header should not be sent. kept for compatibility */
 add_header(&resp, "X", sub->txident);
 /* check if cxident is avail */
 if (sub->cxident[0])
 add_header(&resp, "I", sub->cxident);
 /* fill in new fields */
 resp.cmd = MGCP_CMD_DLCX;
 resp.trid = oseq;
 return send_request(p, sub, &resp, oseq);
}

static int transmit_connection_del_w_params(struct mgcp_endpoint *p, char *callid, char *cxident)
{
 struct mgcp_request resp;
 unsigned int oseq;

 ast_debug(3, "Delete connection %s %s@%s on callid: %s\n",
 cxident ? cxident : "", p->name, p->parent->name, callid ? callid : "");
 oseq = reqprep(&resp, p, "DLCX");
 /* check if call id is avail */
 if (callid && *callid)
 add_header(&resp, "C", callid);
 /* check if cxident is avail */
 if (cxident && *cxident)
 add_header(&resp, "I", cxident);
 /* fill in new fields */
 resp.cmd = MGCP_CMD_DLCX;
 resp.trid = oseq;
 return send_request(p, p->sub, &resp, oseq);
}

/*! \brief dump_cmd_queues: (SC:) cleanup pending commands */
static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub)
{
 struct mgcp_request *t, *q;

 if (p) {
 ast_mutex_lock(&p->rqnt_queue_lock);
 for (q = p->rqnt_queue; q; t = q->next, ast_free(q), q=t);
 p->rqnt_queue = NULL;
 ast_mutex_unlock(&p->rqnt_queue_lock);

 ast_mutex_lock(&p->cmd_queue_lock);
 for (q = p->cmd_queue; q; t = q->next, ast_free(q), q=t);
 p->cmd_queue = NULL;
 ast_mutex_unlock(&p->cmd_queue_lock);

 ast_mutex_lock(&p->sub->cx_queue_lock);
 for (q = p->sub->cx_queue; q; t = q->next, ast_free(q), q=t);
 p->sub->cx_queue = NULL;
 ast_mutex_unlock(&p->sub->cx_queue_lock);

 ast_mutex_lock(&p->sub->next->cx_queue_lock);
 for (q = p->sub->next->cx_queue; q; t = q->next, ast_free(q), q=t);
 p->sub->next->cx_queue = NULL;
 ast_mutex_unlock(&p->sub->next->cx_queue_lock);
 } else if (sub) {
 ast_mutex_lock(&sub->cx_queue_lock);
 for (q = sub->cx_queue; q; t = q->next, ast_free(q), q=t);
 sub->cx_queue = NULL;
 ast_mutex_unlock(&sub->cx_queue_lock);
 }
}


/*! \brief find_command: (SC:) remove command transaction from queue */
static struct mgcp_request *find_command(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 struct mgcp_request **queue, ast_mutex_t *l, int ident)
{
 struct mgcp_request *prev, *req;

 ast_mutex_lock(l);
 for (prev = NULL, req = *queue; req; prev = req, req = req->next) {
 if (req->trid == ident) {
 /* remove from queue */
 if (!prev)
 *queue = req->next;
 else
 prev->next = req->next;

 /* send next pending command */
 if (*queue) {
 ast_debug(1, "Posting Queued Request:\n%s to %s:%d\n", (*queue)->data,
 ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));

 mgcp_postrequest(p, sub, (*queue)->data, (*queue)->len, (*queue)->trid);
 }
 break;
 }
 }
 ast_mutex_unlock(l);
 return req;
}

/* modified for new transport mechanism */
static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 int result, unsigned int ident, struct mgcp_request *resp)
{
 char *c;
 struct mgcp_request *req;
 struct mgcp_gateway *gw = p->parent;

 if (result < 200) {
 /* provisional response */
 return;
 }

 if (p->slowsequence)
 req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);
 else if (sub)
 req = find_command(p, sub, &sub->cx_queue, &sub->cx_queue_lock, ident);
 else if (!(req = find_command(p, sub, &p->rqnt_queue, &p->rqnt_queue_lock, ident)))
 req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);

 if (!req) {
 ast_verb(3, "No command found on [%s] for transaction %u. Ignoring...\n",
 gw->name, ident);
 return;
 }

 if (p && (result >= 400) && (result <= 599)) {
 switch (result) {
 case 401:
 p->hookstate = MGCP_OFFHOOK;
 break;
 case 402:
 p->hookstate = MGCP_ONHOOK;
 break;
 case 406:
 ast_log(LOG_NOTICE, "Transaction %u timed out\n", ident);
 break;
 case 407:
 ast_log(LOG_NOTICE, "Transaction %u aborted\n", ident);
 break;
 }
 if (sub) {
 if (!sub->cxident[0] && (req->cmd == MGCP_CMD_CRCX)) {
 ast_log(LOG_NOTICE, "DLCX for all connections on %s due to error %d\n", gw->name, result);
 transmit_connection_del(sub);
 }
 if (sub->owner) {
 ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
 result, p->name, p->parent->name, sub ? sub->id:-1);
 mgcp_queue_hangup(sub);
 }
 } else {
 if (p->sub->next->owner) {
 ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
 result, p->name, p->parent->name, sub ? sub->id:-1);
 mgcp_queue_hangup(p->sub);
 }

 if (p->sub->owner) {
 ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
 result, p->name, p->parent->name, sub ? sub->id:-1);
 mgcp_queue_hangup(p->sub);
 }

 dump_cmd_queues(p, NULL);
 }
 }

 if (resp) {
 /* responseAck: */
 if (result == 200 && (req->cmd == MGCP_CMD_CRCX || req->cmd == MGCP_CMD_MDCX)) {
 if (sub) {
 transmit_response(sub, "000", resp, "OK");
 if (sub->owner && ast_channel_state(sub->owner) == AST_STATE_RINGING) {
 ast_queue_control(sub->owner, AST_CONTROL_RINGING);
 }
 }
 }
 if (req->cmd == MGCP_CMD_CRCX) {
 if ((c = get_header(resp, "I"))) {
 if (!ast_strlen_zero(c) && sub) {
 /* if we are hanging up do not process this conn. */
 if (sub->owner) {
 if (!ast_strlen_zero(sub->cxident)) {
 if (strcasecmp(c, sub->cxident)) {
 ast_log(LOG_WARNING, "Subchannel already has a cxident. sub->cxident: %s requested %s\n", sub->cxident, c);
 }
 }
 ast_copy_string(sub->cxident, c, sizeof(sub->cxident));
 if (sub->tmpdest.sin_addr.s_addr) {
 transmit_modify_with_sdp(sub, NULL, 0);
 }
 } else {
 /* XXX delete this one
 callid and conn id may already be lost.
 so the following del conn may have a side effect of
 cleaning up the next subchannel */
 transmit_connection_del(sub);
 }
 }
 }
 }

 if (req->cmd == MGCP_CMD_AUEP) {
 /* check stale connection ids */
 if ((c = get_header(resp, "I"))) {
 char *v, *n;
 int len;
 while ((v = get_csv(c, &len, &n))) {
 if (len) {
 if (strncasecmp(v, p->sub->cxident, len) &&
 strncasecmp(v, p->sub->next->cxident, len)) {
 /* connection id not found. delete it */
 char cxident[80] = "";

 if (len > (sizeof(cxident) - 1))
 len = sizeof(cxident) - 1;
 ast_copy_string(cxident, v, len);
 ast_verb(3, "Non existing connection id %s on %s@%s \n",
 cxident, p->name, gw->name);
 transmit_connection_del_w_params(p, NULL, cxident);
 }
 }
 c = n;
 }
 }

 /* Try to determine the hookstate returned from an audit endpoint command */
 if ((c = get_header(resp, "ES"))) {
 if (!ast_strlen_zero(c)) {
 if (strstr(c, "hu")) {
 if (p->hookstate != MGCP_ONHOOK) {
 /* XXX cleanup if we think we are offhook XXX */
 if ((p->sub->owner || p->sub->next->owner ) &&
 p->hookstate == MGCP_OFFHOOK)
 mgcp_queue_hangup(sub);
 p->hookstate = MGCP_ONHOOK;

 /* update the requested events according to the new hookstate */
 transmit_notify_request(p->sub, "");

 ast_verb(3, "Setting hookstate of %s@%s to ONHOOK\n", p->name, gw->name);
 }
 } else if (strstr(c, "hd")) {
 if (p->hookstate != MGCP_OFFHOOK) {
 p->hookstate = MGCP_OFFHOOK;

 /* update the requested events according to the new hookstate */
 transmit_notify_request(p->sub, "");

 ast_verb(3, "Setting hookstate of %s@%s to OFFHOOK\n", p->name, gw->name);
 }
 }
 }
 }
 }

 if (resp && resp->lines) {
 /* do not process sdp if we are hanging up. this may be a late response */
 if (sub && sub->owner) {
 if (!sub->rtp)
 start_rtp(sub);
 if (sub->rtp)
 process_sdp(sub, resp);
 }
 }
 }

 ast_free(req);
}

static void start_rtp(struct mgcp_subchannel *sub)
{
 struct ast_sockaddr bindaddr_tmp;

 ast_mutex_lock(&sub->lock);
 /* check again to be on the safe side */
 if (sub->rtp) {
 ast_rtp_instance_destroy(sub->rtp);
 sub->rtp = NULL;
 }
 /* Allocate the RTP now */
 ast_sockaddr_from_sin(&bindaddr_tmp, &bindaddr);
 sub->rtp = ast_rtp_instance_new("asterisk", sched, &bindaddr_tmp, NULL);
 if (sub->rtp && sub->owner)
 ast_channel_set_fd(sub->owner, 0, ast_rtp_instance_fd(sub->rtp, 0));
 if (sub->rtp) {
 ast_rtp_instance_set_qos(sub->rtp, qos.tos_audio, qos.cos_audio, "MGCP RTP");
 ast_rtp_instance_set_prop(sub->rtp, AST_RTP_PROPERTY_NAT, sub->nat);
 }
 /* Make a call*ID */
 snprintf(sub->callid, sizeof(sub->callid), "%08lx%s", (unsigned long)ast_random(), sub->txident);
 /* Transmit the connection create */
 if(!sub->parent->pktcgatealloc) {
 transmit_connect_with_sdp(sub, NULL);
 } else {
 transmit_connect(sub);
 sub->gate = NULL;
 if(!mgcp_alloc_pktcgate(sub))
 mgcp_queue_hangup(sub);
 }
 ast_mutex_unlock(&sub->lock);
}

static void *mgcp_ss(void *data)
{
 struct ast_channel *chan = data;
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(chan);
 struct mgcp_endpoint *p = sub->parent;
 /* char exten[AST_MAX_EXTENSION] = ""; */
 int len = 0;
 int timeout = firstdigittimeout;
 int res= 0;
 int getforward = 0;
 int loop_pause = 100;
 RAII_VAR(struct ast_features_pickup_config *, pickup_cfg, NULL, ao2_cleanup);
 const char *pickupexten;

 len = strlen(p->dtmf_buf);

 ast_channel_lock(chan);
 pickup_cfg = ast_get_chan_features_pickup_config(chan);
 if (!pickup_cfg) {
 ast_log(LOG_ERROR, "Unable to retrieve pickup configuration options. Unable to detect call pickup extension\n");
 pickupexten = "";
 } else {
 pickupexten = ast_strdupa(pickup_cfg->pickupexten);
 }
 ast_channel_unlock(chan);

 while (len < AST_MAX_EXTENSION - 1) {
 ast_debug(1, "Dtmf buffer '%s' for '%s@%s'\n", p->dtmf_buf, p->name, p->parent->name);
 res = 1; /* Assume that we will get a digit */
 while (strlen(p->dtmf_buf) == len) {
 ast_safe_sleep(chan, loop_pause);
 timeout -= loop_pause;
 if (timeout <= 0){
 res = 0;
 break;
 }
 res = 1;
 }

 timeout = 0;
 len = strlen(p->dtmf_buf);

 if (!ast_ignore_pattern(ast_channel_context(chan), p->dtmf_buf)) {
 /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
 ast_indicate(chan, -1);
 } else {
 /* XXX Redundant? We should already be playing dialtone */
 /*tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
 transmit_notify_request(sub, "L/dl");
 }
 if (ast_exists_extension(chan, ast_channel_context(chan), p->dtmf_buf, 1, p->cid_num)) {
 if (!res || !ast_matchmore_extension(chan, ast_channel_context(chan), p->dtmf_buf, 1, p->cid_num)) {
 if (getforward) {
 /* Record this as the forwarding extension */
 ast_copy_string(p->call_forward, p->dtmf_buf, sizeof(p->call_forward));
 ast_verb(3, "Setting call forward to '%s' on channel %s\n",
 p->call_forward, ast_channel_name(chan));
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 if (res)
 break;
 usleep(500000);
 /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
 ast_indicate(chan, -1);
 sleep(1);
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
 transmit_notify_request(sub, "L/dl");
 len = 0;
 getforward = 0;
 } else {
 /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
 ast_indicate(chan, -1);
 ast_channel_lock(chan);
 ast_channel_exten_set(chan, p->dtmf_buf);
 ast_channel_dialed(chan)->number.str = ast_strdup(p->dtmf_buf);
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 ast_set_callerid(chan,
 p->hidecallerid ? "" : p->cid_num,
 p->hidecallerid ? "" : p->cid_name,
 ast_channel_caller(chan)->ani.number.valid ? NULL : p->cid_num);
 ast_setstate(chan, AST_STATE_RING);
 ast_channel_unlock(chan);
 if (p->dtmfmode & MGCP_DTMF_HYBRID) {
 p->dtmfmode |= MGCP_DTMF_INBAND;
 ast_indicate(chan, -1);
 }
 res = ast_pbx_run(chan);
 if (res) {
 ast_log(LOG_WARNING, "PBX exited non-zero\n");
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
 /*transmit_notify_request(p, "nbz", 1);*/
 transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
 }
 return NULL;
 }
 } else {
 /* It's a match, but they just typed a digit, and there is an ambiguous match,
 so just set the timeout to matchdigittimeout and wait some more */
 timeout = matchdigittimeout;
 }
 } else if (res == 0) {
 ast_debug(1, "not enough digits (and no ambiguous match)...\n");
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
 transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
 /*dahdi_wait_event(p->subs[index].zfd);*/
 ast_hangup(chan);
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 return NULL;
 } else if (p->hascallwaiting && p->callwaiting && !strcmp(p->dtmf_buf, "*70")) {
 ast_verb(3, "Disabling call waiting on %s\n", ast_channel_name(chan));
 /* Disable call waiting if enabled */
 p->callwaiting = 0;
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 len = 0;
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 timeout = firstdigittimeout;
 } else if (!strcmp(p->dtmf_buf, pickupexten)) {
 /* Scan all channels and see if any there
 * ringing channqels with that have call groups
 * that equal this channels pickup group
 */
 if (ast_pickup_call(chan)) {
 ast_log(LOG_WARNING, "No call pickup possible...\n");
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
 transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
 }
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 ast_hangup(chan);
 return NULL;
 } else if (!p->hidecallerid && !strcmp(p->dtmf_buf, "*67")) {
 ast_verb(3, "Disabling Caller*ID on %s\n", ast_channel_name(chan));
 /* Disable Caller*ID if enabled */
 p->hidecallerid = 1;
 ast_set_callerid(chan, "", "", NULL);
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 len = 0;
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 timeout = firstdigittimeout;
 } else if (p->callreturn && !strcmp(p->dtmf_buf, "*69")) {
 res = 0;
 if (!ast_strlen_zero(p->lastcallerid)) {
 res = ast_say_digit_str(chan, p->lastcallerid, "", ast_channel_language(chan));
 }
 if (!res)
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 break;
 } else if (!strcmp(p->dtmf_buf, "*78")) {
 /* Do not disturb */
 ast_verb(3, "Enabled DND on channel %s\n", ast_channel_name(chan));
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 p->dnd = 1;
 getforward = 0;
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 len = 0;
 } else if (!strcmp(p->dtmf_buf, "*79")) {
 /* Do not disturb */
 ast_verb(3, "Disabled DND on channel %s\n", ast_channel_name(chan));
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 p->dnd = 0;
 getforward = 0;
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 len = 0;
 } else if (p->cancallforward && !strcmp(p->dtmf_buf, "*72")) {
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 getforward = 1;
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 len = 0;
 } else if (p->cancallforward && !strcmp(p->dtmf_buf, "*73")) {
 ast_verb(3, "Cancelling call forwarding on channel %s\n", ast_channel_name(chan));
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 memset(p->call_forward, 0, sizeof(p->call_forward));
 getforward = 0;
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 len = 0;
 } else if (ast_parking_provider_registered() && ast_parking_is_exten_park(ast_channel_context(chan), p->dtmf_buf) &&
 sub->next->owner) {
 RAII_VAR(struct ast_bridge_channel *, bridge_channel, NULL, ao2_cleanup);
 /* This is a three way call, the main call being a real channel,
 and we're parking the first call. */
 ast_channel_lock(chan);
 bridge_channel = ast_channel_get_bridge_channel(chan);
 ast_channel_unlock(chan);
 if (bridge_channel && !ast_parking_blind_transfer_park(bridge_channel, ast_channel_context(chan), p->dtmf_buf, NULL, NULL)) {
 ast_verb(3, "Parking call to '%s'\n", ast_channel_name(chan));
 }
 break;
 } else if (!ast_strlen_zero(p->lastcallerid) && !strcmp(p->dtmf_buf, "*60")) {
 ast_verb(3, "Blacklisting number %s\n", p->lastcallerid);
 res = ast_db_put("blacklist", p->lastcallerid, "1");
 if (!res) {
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 len = 0;
 }
 } else if (p->hidecallerid && !strcmp(p->dtmf_buf, "*82")) {
 ast_verb(3, "Enabling Caller*ID on %s\n", ast_channel_name(chan));
 /* Enable Caller*ID if enabled */
 p->hidecallerid = 0;
 ast_set_callerid(chan, p->cid_num, p->cid_name, NULL);
 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
 transmit_notify_request(sub, "L/sl");
 len = 0;
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 timeout = firstdigittimeout;
 } else if (!ast_canmatch_extension(chan, ast_channel_context(chan), p->dtmf_buf, 1,
 S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL))
 && ((p->dtmf_buf[0] != '*') || (strlen(p->dtmf_buf) > 2))) {
 ast_debug(1, "Can't match %s from '%s' in context %s\n", p->dtmf_buf,
 S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, "<Unknown Caller>"),
 ast_channel_context(chan));
 break;
 }
 if (!timeout)
 timeout = gendigittimeout;
 if (len && !ast_ignore_pattern(ast_channel_context(chan), p->dtmf_buf))
 /*tone_zone_play_tone(p->subs[index].zfd, -1);*/
 ast_indicate(chan, -1);
 }
#if 0
 for (;;) {
 res = ast_waitfordigit(chan, to);
 if (!res) {
 ast_debug(1, "Timeout...\n");
 break;
 }
 if (res < 0) {
 ast_debug(1, "Got hangup...\n");
 ast_hangup(chan);
 break;
 }
 exten[pos++] = res;
 if (!ast_ignore_pattern(chan->context, exten))
 ast_indicate(chan, -1);
 if (ast_matchmore_extension(chan, chan->context, exten, 1, chan->callerid)) {
 if (ast_exists_extension(chan, chan->context, exten, 1, chan->callerid))
 to = 3000;
 else
 to = 8000;
 } else
 break;
 }
 if (ast_exists_extension(chan, chan->context, exten, 1, chan->callerid)) {
 ast_copy_string(chan->exten, exten, sizeof(chan->exten)1);
 if (!p->rtp) {
 start_rtp(p);
 }
 ast_setstate(chan, AST_STATE_RING);
 chan->rings = 1;
 if (ast_pbx_run(chan)) {
 ast_log(LOG_WARNING, "Unable to launch PBX on %s\n", chan->name);
 } else {
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 return NULL;
 }
 }
#endif
 ast_hangup(chan);
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 return NULL;
}

/*! \brief Complete an attended transfer
 *
 * \param p The endpoint performing the attended transfer
 * \param sub The sub-channel completing the attended transfer
 *
 * \note p->sub is the currently active sub-channel (the channel the phone is using)
 * \note p->sub->next is the sub-channel not in use, potentially on hold
 *
 * \retval 0 when channel should be hung up
 * \retval 1 when channel should not be hung up
 */
static int attempt_transfer(struct mgcp_endpoint *p, struct mgcp_subchannel *sub)
{
 enum ast_transfer_result res;

 /* Ensure that the other channel goes off hold and that it is indicating properly */
 ast_queue_unhold(sub->next->owner);
 if (ast_channel_state(sub->owner) == AST_STATE_RINGING) {
 ast_queue_control(sub->next->owner, AST_CONTROL_RINGING);
 }

 ast_mutex_unlock(&p->sub->next->lock);
 ast_mutex_unlock(&p->sub->lock);
 res = ast_bridge_transfer_attended(sub->owner, sub->next->owner);

 /* Subs are only freed when the endpoint itself is destroyed, so they will continue to exist
 * after ast_bridge_transfer_attended returns making this safe without reference counting
 */
 ast_mutex_lock(&p->sub->lock);
 ast_mutex_lock(&p->sub->next->lock);

 if (res != AST_BRIDGE_TRANSFER_SUCCESS) {
 /* If transferring fails hang up the other channel if present and us */
 if (sub->next->owner) {
 ast_channel_softhangup_internal_flag_add(sub->next->owner, AST_SOFTHANGUP_DEV);
 mgcp_queue_hangup(sub->next);
 }
 sub->next->alreadygone = 1;
 return 0;
 }

 unalloc_sub(sub->next);

 /* If the active sub is NOT the one completing the transfer change it to be, and hang up the other sub */
 if (p->sub != sub) {
 p->sub = sub;
 return 1;
 }

 return 0;
}

static void handle_hd_hf(struct mgcp_subchannel *sub, char *ev)
{
 struct mgcp_endpoint *p = sub->parent;
 struct ast_channel *c;
 pthread_t t;

 /* Off hook / answer */
 if (sub->outgoing) {
 /* Answered */
 if (sub->owner) {
 ast_queue_unhold(sub->owner);
 sub->cxmode = MGCP_CX_SENDRECV;
 if (!sub->rtp) {
 start_rtp(sub);
 } else {
 transmit_modify_request(sub);
 }
 /*transmit_notify_request(sub, "aw");*/
 transmit_notify_request(sub, "");
 mgcp_queue_control(sub, AST_CONTROL_ANSWER);
 }
 } else {
 /* Start switch */
 /*sub->cxmode = MGCP_CX_SENDRECV;*/
 if (!sub->owner) {
 if (!sub->rtp) {
 start_rtp(sub);
 } else {
 transmit_modify_request(sub);
 }
 if (p->immediate) {
 /* The channel is immediately up. Start right away */
#ifdef DLINK_BUGGY_FIRMWARE
 transmit_notify_request(sub, "rt");
#else
 transmit_notify_request(sub, p->ncs ? "L/rt" : "G/rt");
#endif
 c = mgcp_new(sub, AST_STATE_RING, NULL, NULL);
 if (!c) {
 ast_log(LOG_WARNING, "Unable to start PBX on channel %s@%s\n", p->name, p->parent->name);
 transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
 ast_hangup(c);
 }
 } else {
 if (has_voicemail(p)) {
 transmit_notify_request(sub, "L/sl");
 } else {
 transmit_notify_request(sub, "L/dl");
 }
 c = mgcp_new(sub, AST_STATE_DOWN, NULL, NULL);
 if (c) {
 if (ast_pthread_create_detached(&t, NULL, mgcp_ss, c)) {
 ast_log(LOG_WARNING, "Unable to create switch thread: %s\n", strerror(errno));
 ast_hangup(c);
 }
 } else {
 ast_log(LOG_WARNING, "Unable to create channel for %s@%s\n", p->name, p->parent->name);
 }
 }
 } else {
 if (p->hookstate == MGCP_OFFHOOK) {
 ast_log(LOG_WARNING, "Off hook, but already have owner on %s@%s\n", p->name, p->parent->name);
 } else {
 ast_log(LOG_WARNING, "On hook, but already have owner on %s@%s\n", p->name, p->parent->name);
 ast_log(LOG_WARNING, "If we're onhook why are we here trying to handle a hd or hf?\n");
 }
 ast_queue_unhold(sub->owner);
 sub->cxmode = MGCP_CX_SENDRECV;
 if (!sub->rtp) {
 start_rtp(sub);
 } else {
 transmit_modify_request(sub);
 }
 /*transmit_notify_request(sub, "aw");*/
 transmit_notify_request(sub, "");
 /*ast_queue_control(sub->owner, AST_CONTROL_ANSWER);*/
 }
 }
}

static int handle_request(struct mgcp_subchannel *sub, struct mgcp_request *req, struct sockaddr_in *sin)
{
 char *ev, *s;
 struct ast_frame f = { 0, };
 struct mgcp_endpoint *p = sub->parent;
 struct mgcp_gateway *g = NULL;
 int res;

 ast_debug(1, "Handling request '%s' on %s@%s\n", req->verb, p->name, p->parent->name);
 /* Clear out potential response */
 if (!strcasecmp(req->verb, "RSIP")) {
 /* Test if this RSIP request is just a keepalive */
 if (!strcasecmp( get_header(req, "RM"), "X-keepalive")) {
 ast_verb(3, "Received keepalive request from %s@%s\n", p->name, p->parent->name);
 transmit_response(sub, "200", req, "OK");
 } else {
 dump_queue(p->parent, p);
 dump_cmd_queues(p, NULL);

 if ((strcmp(p->name, p->parent->wcardep) != 0)) {
 ast_verb(3, "Resetting interface %s@%s\n", p->name, p->parent->name);
 }
 /* For RSIP on wildcard we reset all endpoints */
 if (!strcmp(p->name, p->parent->wcardep)) {
 /* Reset all endpoints */
 struct mgcp_endpoint *tmp_ep;

 g = p->parent;
 for (tmp_ep = g->endpoints; tmp_ep; tmp_ep = tmp_ep->next) {
 /*if ((strcmp(tmp_ep->name, "*") != 0) && (strcmp(tmp_ep->name, "aaln/" "*") != 0)) {*/
 if (strcmp(tmp_ep->name, g->wcardep) != 0) {
 struct mgcp_subchannel *tmp_sub, *first_sub;
 ast_verb(3, "Resetting interface %s@%s\n", tmp_ep->name, p->parent->name);

 first_sub = tmp_ep->sub;
 tmp_sub = tmp_ep->sub;
 while (tmp_sub) {
 mgcp_queue_hangup(tmp_sub);
 tmp_sub = tmp_sub->next;
 if (tmp_sub == first_sub)
 break;
 }
 }
 }
 } else if (sub->owner) {
 mgcp_queue_hangup(sub);
 }
 transmit_response(sub, "200", req, "OK");
 /* We don't send NTFY or AUEP to wildcard ep */
 if (strcmp(p->name, p->parent->wcardep) != 0) {
 transmit_notify_request(sub, "");
 /* Audit endpoint.
 Idea is to prevent lost lines due to race conditions
 */
 transmit_audit_endpoint(p);
 }
 }
 } else if (!strcasecmp(req->verb, "NTFY")) {
 /* Acknowledge and be sure we keep looking for the same things */
 transmit_response(sub, "200", req, "OK");
 /* Notified of an event */
 ev = get_header(req, "O");
 s = strchr(ev, '/');
 if (s) ev = s + 1;
 ast_debug(1, "Endpoint '%s@%s-%d' observed '%s'\n", p->name, p->parent->name, sub->id, ev);
 /* Keep looking for events unless this was a hangup */
 if (strcasecmp(ev, "hu") && strcasecmp(ev, "hd") && strcasecmp(ev, "ping")) {
 transmit_notify_request(sub, p->curtone);
 }
 if (!strcasecmp(ev, "hd")) {
 p->hookstate = MGCP_OFFHOOK;
 sub->cxmode = MGCP_CX_SENDRECV;

 if (p) {
 /* When the endpoint have a Off hook transition we allways
 starts without any previous dtmfs */
 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 }

 handle_hd_hf(sub, ev);
 } else if (!strcasecmp(ev, "hf")) {
 /* We can assume we are offhook if we received a hookflash */
 /* First let's just do call wait and ignore threeway */
 /* We're currently in charge */
 if (p->hookstate != MGCP_OFFHOOK) {
 /* Cisco c7940 sends hf even if the phone is onhook */
 /* Thanks to point on IRC for pointing this out */
 return -1;
 }
 /* do not let * conference two down channels */
 if (sub->owner && ast_channel_state(sub->owner) == AST_STATE_DOWN && !sub->next->owner)
 return -1;

 if (p->callwaiting || p->transfer || p->threewaycalling) {
 ast_verb(3, "Swapping %d for %d on %s@%s\n", p->sub->id, p->sub->next->id, p->name, p->parent->name);
 p->sub = p->sub->next;

 /* transfer control to our next subchannel */
 if (!sub->next->owner) {
 /* plave the first call on hold and start up a new call */
 sub->cxmode = MGCP_CX_MUTE;
 ast_verb(3, "MGCP Muting %d on %s@%s\n", sub->id, p->name, p->parent->name);
 transmit_modify_request(sub);
 if (sub->owner) {
 ast_queue_hold(sub->owner, NULL);
 }
 sub->next->cxmode = MGCP_CX_RECVONLY;
 handle_hd_hf(sub->next, ev);
 } else if (sub->owner && sub->next->owner) {
 /* We've got two active calls lets decide whether or not to conference or just flip flop */
 if ((!sub->outgoing) && (!sub->next->outgoing)) {
 /* We made both calls lets conference */
 ast_verb(3, "MGCP Conferencing %d and %d on %s@%s\n",
 sub->id, sub->next->id, p->name, p->parent->name);
 sub->cxmode = MGCP_CX_CONF;
 sub->next->cxmode = MGCP_CX_CONF;
 ast_queue_unhold(sub->next->owner);
 transmit_modify_request(sub);
 transmit_modify_request(sub->next);
 } else {
 /* Let's flipflop between calls */
 /* XXX Need to check for state up ??? */
 /* XXX Need a way to indicate the current call, or maybe the call that's waiting */
 ast_verb(3, "We didn't make one of the calls FLIPFLOP %d and %d on %s@%s\n",
 sub->id, sub->next->id, p->name, p->parent->name);
 sub->cxmode = MGCP_CX_MUTE;
 ast_verb(3, "MGCP Muting %d on %s@%s\n", sub->id, p->name, p->parent->name);
 transmit_modify_request(sub);

 ast_queue_hold(sub->owner, NULL);
 ast_queue_hold(sub->next->owner, NULL);

 handle_hd_hf(sub->next, ev);
 }
 } else {
 /* We've most likely lost one of our calls find an active call and bring it up */
 if (sub->owner) {
 p->sub = sub;
 } else if (sub->next->owner) {
 p->sub = sub->next;
 } else {
 /* We seem to have lost both our calls */
 /* XXX - What do we do now? */
 return -1;
 }
 ast_queue_unhold(p->sub->owner);
 p->sub->cxmode = MGCP_CX_SENDRECV;
 transmit_modify_request(p->sub);
 }
 } else {
 ast_log(LOG_WARNING, "Callwaiting, call transfer or threeway calling not enabled on endpoint %s@%s\n",
 p->name, p->parent->name);
 }
 } else if (!strcasecmp(ev, "hu")) {
 p->hookstate = MGCP_ONHOOK;
 sub->cxmode = MGCP_CX_RECVONLY;
 ast_debug(1, "MGCP %s@%s Went on hook\n", p->name, p->parent->name);
 /* Do we need to send MDCX before a DLCX ?
 if (sub->rtp) {
 transmit_modify_request(sub);
 }
 */
 if (p->transfer && (sub->owner && sub->next->owner) && ((!sub->outgoing) || (!sub->next->outgoing))) {
 /* We're allowed to transfer, we have two avtive calls and */
 /* we made at least one of the calls. Let's try and transfer */
 ast_mutex_lock(&p->sub->next->lock);
 res = attempt_transfer(p, sub);
 if (res) {
 ast_log(LOG_WARNING, "Transfer attempt failed\n");
 ast_mutex_unlock(&p->sub->next->lock);
 return -1;
 }
 ast_mutex_unlock(&p->sub->next->lock);
 } else {
 /* Hangup the current call */
 /* If there is another active call, mgcp_hangup will ring the phone with the other call */
 if (sub->owner) {
 sub->alreadygone = 1;
 mgcp_queue_hangup(sub);
 } else {
 ast_verb(3, "MGCP handle_request(%s@%s-%d) ast_channel already destroyed, resending DLCX.\n",
 p->name, p->parent->name, sub->id);
 /* Instruct the other side to remove the connection since it apparently *
 * still thinks the channel is active. *
 * For Cisco IAD2421 /BAK/ */
 transmit_connection_del(sub);
 }
 }
 if ((p->hookstate == MGCP_ONHOOK) && (!sub->rtp) && (!sub->next->rtp)) {
 p->hidecallerid = 0;
 if (p->hascallwaiting && !p->callwaiting) {
 ast_verb(3, "Enabling call waiting on MGCP/%s@%s-%d\n", p->name, p->parent->name, sub->id);
 p->callwaiting = -1;
 }
 if (has_voicemail(p)) {
 ast_verb(3, "MGCP handle_request(%s@%s) set vmwi(+)\n", p->name, p->parent->name);
 transmit_notify_request(sub, "L/vmwi(+)");
 } else {
 ast_verb(3, "MGCP handle_request(%s@%s) set vmwi(-)\n", p->name, p->parent->name);
 transmit_notify_request(sub, "L/vmwi(-)");
 }
 }
 } else if ((strlen(ev) == 1) &&
 (((ev[0] >= '0') && (ev[0] <= '9')) ||
 ((ev[0] >= 'A') && (ev[0] <= 'D')) ||
 (ev[0] == '*') || (ev[0] == '#'))) {
 if (sub && sub->owner && (ast_channel_state(sub->owner) >= AST_STATE_UP)) {
 f.frametype = AST_FRAME_DTMF;
 f.subclass.integer = ev[0];
 f.src = "mgcp";
 /* XXX MUST queue this frame to all subs in threeway call if threeway call is active */
 mgcp_queue_frame(sub, &f);
 ast_mutex_lock(&sub->next->lock);
 if (sub->next->owner)
 mgcp_queue_frame(sub->next, &f);
 ast_mutex_unlock(&sub->next->lock);
 if (strstr(p->curtone, (p->ncs ? "wt1" : "wt")) && (ev[0] == 'A')) {
 memset(p->curtone, 0, sizeof(p->curtone));
 }
 } else {
 p->dtmf_buf[strlen(p->dtmf_buf)] = ev[0];
 p->dtmf_buf[strlen(p->dtmf_buf)] = '\0';
 }
 } else if (!strcasecmp(ev, "T")) {
 /* Digit timeout -- unimportant */
 } else if (!strcasecmp(ev, "ping")) {
 /* ping -- unimportant */
 } else {
 ast_log(LOG_NOTICE, "Received unknown event '%s' from %s@%s\n", ev, p->name, p->parent->name);
 }
 } else {
 ast_log(LOG_WARNING, "Unknown verb '%s' received from %s\n", req->verb, ast_inet_ntoa(sin->sin_addr));
 transmit_response(sub, "510", req, "Unknown verb");
 }
 return 0;
}

static int find_and_retrans(struct mgcp_subchannel *sub, struct mgcp_request *req)
{
 int seqno=0;
 time_t now;
 struct mgcp_response *prev = NULL, *cur, *next, *answer = NULL;
 time(&now);
 if (sscanf(req->identifier, "%30d", &seqno) != 1) {
 seqno = 0;
 }
 for (cur = sub->parent->parent->responses, next = cur ? cur->next : NULL; cur; cur = next, next = cur ? cur->next : NULL) {
 if (now - cur->whensent > RESPONSE_TIMEOUT) {
 /* Delete this entry */
 if (prev)
 prev->next = next;
 else
 sub->parent->parent->responses = next;
 ast_free(cur);
 } else {
 if (seqno == cur->seqno)
 answer = cur;
 prev = cur;
 }
 }
 if (answer) {
 resend_response(sub, answer);
 return 1;
 }
 return 0;
}

static int mgcpsock_read(int *id, int fd, short events, void *ignore)
{
 struct mgcp_request req;
 struct sockaddr_in sin;
 struct mgcp_subchannel *sub;
 int res;
 socklen_t len;
 int result;
 int ident;
 len = sizeof(sin);
 memset(&req, 0, sizeof(req));
 res = recvfrom(mgcpsock, req.data, sizeof(req.data) - 1, 0, (struct sockaddr *)&sin, &len);
 if (res < 0) {
 if (errno != ECONNREFUSED)
 ast_log(LOG_WARNING, "Recv error: %s\n", strerror(errno));
 return 1;
 }
 req.data[res] = '\0';
 req.len = res;
 ast_debug(1, "MGCP read: \n%s\nfrom %s:%d\n", req.data, ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
 parse(&req);
 if (req.headers < 1) {
 /* Must have at least one header */
 return 1;
 }
 if (ast_strlen_zero(req.identifier)) {
 ast_log(LOG_NOTICE, "Message from %s missing identifier\n", ast_inet_ntoa(sin.sin_addr));
 return 1;
 }

 if (sscanf(req.verb, "%30d", &result) && sscanf(req.identifier, "%30d", &ident)) {
 if (result < 200) {
 ast_debug(1, "Ignoring provisional response on transaction %d\n", ident);
 return 1;
 }
 /* Try to find who this message is for, if it's important */
 sub = find_subchannel_and_lock(NULL, ident, &sin);
 if (sub) {
 struct mgcp_gateway *gw = sub->parent->parent;
 struct mgcp_message *cur, *prev;

 ast_mutex_unlock(&sub->lock);
 ast_mutex_lock(&gw->msgs_lock);
 for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
 if (cur->seqno == ident) {
 ast_debug(1, "Got response back on transaction %d\n", ident);
 if (prev)
 prev->next = cur->next;
 else
 gw->msgs = cur->next;
 break;
 }
 }

 /* stop retrans timer if the queue is empty */
 if (!gw->msgs) {
 AST_SCHED_DEL(sched, gw->retransid);
 }

 ast_mutex_unlock(&gw->msgs_lock);
 if (cur) {
 handle_response(cur->owner_ep, cur->owner_sub, result, ident, &req);
 ast_free(cur);
 return 1;
 }

 ast_log(LOG_NOTICE, "Got response back on [%s] for transaction %d we aren't sending?\n",
 gw->name, ident);
 }
 } else {
 if (ast_strlen_zero(req.endpoint) ||
 ast_strlen_zero(req.version) ||
 ast_strlen_zero(req.verb)) {
 ast_log(LOG_NOTICE, "Message must have a verb, an idenitifier, version, and endpoint\n");
 return 1;
 }
 /* Process request, with iflock held */
 sub = find_subchannel_and_lock(req.endpoint, 0, &sin);
 if (sub) {
 /* look first to find a matching response in the queue */
 if (!find_and_retrans(sub, &req))
 /* pass the request off to the currently mastering subchannel */
 handle_request(sub, &req, &sin);
 ast_mutex_unlock(&sub->lock);
 }
 }
 return 1;
}

static int *mgcpsock_read_id = NULL;

static int mgcp_prune_realtime_gateway(struct mgcp_gateway *g)
{
 struct mgcp_endpoint *enext, *e;
 struct mgcp_subchannel *s, *sub;
 int i, prune = 1;

 if (g->ha || !g->realtime || ast_mutex_trylock(&g->msgs_lock) || g->msgs) {
 ast_mutex_unlock(&g->msgs_lock);
 return 0;
 }

 for (e = g->endpoints; e; e = e->next) {
 ast_mutex_lock(&e->lock);
 if (e->dsp || ast_mutex_trylock(&e->rqnt_queue_lock) || ast_mutex_trylock(&e->cmd_queue_lock)) {
 prune = 0;
 } else if (e->rqnt_queue || e->cmd_queue) {
 prune = 0;
 }
 s = e->sub;
 for (i = 0; (i < MAX_SUBS) && s; i++) {
 ast_mutex_lock(&s->lock);
 if (!ast_strlen_zero(s->cxident) || s->rtp || ast_mutex_trylock(&s->cx_queue_lock) || s->gate) {
 prune = 0;
 } else if (s->cx_queue) {
 prune = 0;
 }
 s = s->next;
 }
 }

 for (e = g->endpoints, sub = e->sub, enext = e->next; e; e = enext, enext = e->next) {
 for (i = 0; (i < MAX_SUBS) && sub; i++) {
 s = sub;
 sub = sub->next;
 ast_mutex_unlock(&s->lock);
 ast_mutex_unlock(&s->cx_queue_lock);
 if (prune) {
 ast_mutex_destroy(&s->lock);
 ast_mutex_destroy(&s->cx_queue_lock);
 ast_free(s);
 }
 }
 ast_mutex_unlock(&e->lock);
 ast_mutex_unlock(&e->rqnt_queue_lock);
 ast_mutex_unlock(&e->cmd_queue_lock);
 if (prune) {
 ast_mutex_destroy(&e->lock);
 ast_mutex_destroy(&e->rqnt_queue_lock);
 ast_mutex_destroy(&e->cmd_queue_lock);
 ast_free(e);
 }
 }
 if (prune) {
 ast_debug(1, "***** MGCP REALTIME PRUNE GW: %s\n", g->name);
 }
 return prune;
}

static void *do_monitor(void *data)
{
 int res;
 int reloading;
 struct mgcp_gateway *g, *gprev;
 /*struct mgcp_gateway *g;*/
 /*struct mgcp_endpoint *e;*/
 /*time_t thispass = 0, lastpass = 0;*/
 time_t lastrun = 0;

 /* Add an I/O event to our UDP socket */
 if (mgcpsock > -1) {
 mgcpsock_read_id = ast_io_add(io, mgcpsock, mgcpsock_read, AST_IO_IN, NULL);
 }
 /* This thread monitors all the frame relay interfaces which are not yet in use
 (and thus do not have a separate thread) indefinitely */
 /* From here on out, we die whenever asked */
 for (;;) {
 /* Check for a reload request */
 ast_mutex_lock(&mgcp_reload_lock);
 reloading = mgcp_reloading;
 mgcp_reloading = 0;
 ast_mutex_unlock(&mgcp_reload_lock);
 if (reloading) {
 ast_verb(1, "Reloading MGCP\n");
 reload_config(1);
 /* Add an I/O event to our UDP socket */
 if (mgcpsock > -1 && !mgcpsock_read_id) {
 mgcpsock_read_id = ast_io_add(io, mgcpsock, mgcpsock_read, AST_IO_IN, NULL);
 }
 }

 /* Check for interfaces needing to be killed */
 /* Don't let anybody kill us right away. Nobody should lock the interface list
 and wait for the monitor list, but the other way around is okay. */
 ast_mutex_lock(&monlock);
 /* Lock the network interface */
 ast_mutex_lock(&netlock);

#if 0
 /* XXX THIS IS COMPLETELY HOSED */
 /* The gateway goes into a state of panic */
 /* If the vmwi indicator is sent while it is reseting interfaces */
 lastpass = thispass;
 thispass = time(NULL);
 g = gateways;
 while(g) {
 if (thispass != lastpass) {
 e = g->endpoints;
 while(e) {
 if (e->type == TYPE_LINE) {
 res = has_voicemail(e);
 if ((e->msgstate != res) && (e->hookstate == MGCP_ONHOOK) && (!e->rtp)){
 if (res) {
 transmit_notify_request(e, "L/vmwi(+)");
 } else {
 transmit_notify_request(e, "L/vmwi(-)");
 }
 e->msgstate = res;
 e->onhooktime = thispass;
 }
 }
 e = e->next;
 }
 }
 g = g->next;
 }
#endif
 /* pruning unused realtime gateways, running in every 60 seconds*/
 if(time(NULL) > (lastrun + 60)) {
 ast_mutex_lock(&gatelock);
 g = gateways;
 gprev = NULL;
 while(g) {
 if(g->realtime) {
 if(mgcp_prune_realtime_gateway(g)) {
 if(gprev) {
 gprev->next = g->next;
 } else {
 gateways = g->next;
 }
 ast_mutex_unlock(&g->msgs_lock);
 ast_mutex_destroy(&g->msgs_lock);
 ast_free(g);
 } else {
 ast_mutex_unlock(&g->msgs_lock);
 gprev = g;
 }
 } else {
 gprev = g;
 }
 g = g->next;
 }
 ast_mutex_unlock(&gatelock);
 lastrun = time(NULL);
 }
 /* Okay, now that we know what to do, release the network lock */
 ast_mutex_unlock(&netlock);
 /* And from now on, we're okay to be killed, so release the monitor lock as well */
 ast_mutex_unlock(&monlock);
 pthread_testcancel();
 /* Wait for sched or io */
 res = ast_sched_wait(sched);
 /* copied from chan_sip.c */
 if ((res < 0) || (res > 1000)) {
 res = 1000;
 }
 res = ast_io_wait(io, res);
 ast_mutex_lock(&monlock);
 if (res >= 0) {
 ast_sched_runq(sched);
 }
 ast_mutex_unlock(&monlock);
 }
 /* Never reached */
 return NULL;
}

static int restart_monitor(void)
{
 /* If we're supposed to be stopped -- stay stopped */
 if (monitor_thread == AST_PTHREADT_STOP)
 return 0;
 if (ast_mutex_lock(&monlock)) {
 ast_log(LOG_WARNING, "Unable to lock monitor\n");
 return -1;
 }
 if (monitor_thread == pthread_self()) {
 ast_mutex_unlock(&monlock);
 ast_log(LOG_WARNING, "Cannot kill myself\n");
 return -1;
 }
 if (monitor_thread != AST_PTHREADT_NULL) {
 /* Wake up the thread */
 pthread_kill(monitor_thread, SIGURG);
 } else {
 /* Start a new monitor */
 if (ast_pthread_create_background(&monitor_thread, NULL, do_monitor, NULL) < 0) {
 ast_mutex_unlock(&monlock);
 ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
 return -1;
 }
 }
 ast_mutex_unlock(&monlock);
 return 0;
}

static struct ast_channel *mgcp_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *dest, int *cause)
{
 struct mgcp_subchannel *sub;
 struct ast_channel *tmpc = NULL;
 char tmp[256];

 if (!(ast_format_cap_iscompatible(cap, global_capability))) {
 struct ast_str *cap_buf = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
 ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%s'\n",
 ast_format_cap_get_names(cap, &cap_buf));
 /*return NULL;*/
 }
 ast_copy_string(tmp, dest, sizeof(tmp));
 if (ast_strlen_zero(tmp)) {
 ast_log(LOG_NOTICE, "MGCP Channels require an endpoint\n");
 return NULL;
 }
 if (!(sub = find_subchannel_and_lock(tmp, 0, NULL))) {
 ast_log(LOG_WARNING, "Unable to find MGCP endpoint '%s'\n", tmp);
 *cause = AST_CAUSE_UNREGISTERED;
 return NULL;
 }

 ast_verb(3, "MGCP mgcp_request(%s)\n", tmp);
 ast_verb(3, "MGCP cw: %d, dnd: %d, so: %d, sno: %d\n",
 sub->parent->callwaiting, sub->parent->dnd, sub->owner ? 1 : 0, sub->next->owner ? 1: 0);
 /* Must be busy */
 if (((sub->parent->callwaiting) && ((sub->owner) && (sub->next->owner))) ||
 ((!sub->parent->callwaiting) && (sub->owner)) ||
 (sub->parent->dnd && (ast_strlen_zero(sub->parent->call_forward)))) {
 if (sub->parent->hookstate == MGCP_ONHOOK) {
 if (has_voicemail(sub->parent)) {
 transmit_notify_request(sub,"L/vmwi(+)");
 } else {
 transmit_notify_request(sub,"L/vmwi(-)");
 }
 }
 *cause = AST_CAUSE_BUSY;
 ast_mutex_unlock(&sub->lock);
 return NULL;
 }
 tmpc = mgcp_new(sub->owner ? sub->next : sub, AST_STATE_DOWN, assignedids, requestor);
 ast_mutex_unlock(&sub->lock);
 if (!tmpc)
 ast_log(LOG_WARNING, "Unable to make channel for '%s'\n", tmp);
 restart_monitor();
 return tmpc;
}

/* modified for reload support */
/*! \brief build_gateway: parse mgcp.conf and create gateway/endpoint structures */
static struct mgcp_gateway *build_gateway(char *cat, struct ast_variable *v)
{
 struct mgcp_gateway *gw;
 struct mgcp_endpoint *e;
 struct mgcp_subchannel *sub;
 struct ast_variable *chanvars = NULL;

 /*char txident[80];*/
 int i=0, y=0;
 int gw_reload = 0;
 int ep_reload = 0;
 directmedia = DIRECTMEDIA;

 /* locate existing gateway */
 for (gw = gateways; gw; gw = gw->next) {
 if (!strcasecmp(cat, gw->name)) {
 /* gateway already exists */
 gw->delme = 0;
 gw_reload = 1;
 break;
 }
 }

 if (!gw && !(gw = ast_calloc(1, sizeof(*gw)))) {
 return NULL;
 }

 if (!gw_reload) {
 gw->expire = -1;
 gw->realtime = 0;
 gw->retransid = -1;
 ast_mutex_init(&gw->msgs_lock);
 ast_copy_string(gw->name, cat, sizeof(gw->name));
 /* check if the name is numeric ip */
 if ((strchr(gw->name, '.')) && inet_addr(gw->name) != INADDR_NONE)
 gw->isnamedottedip = 1;
 }
 for (; v; v = v->next) {
 if (!strcasecmp(v->name, "host")) {
 if (!strcasecmp(v->value, "dynamic")) {
 /* They'll register with us */
 gw->dynamic = 1;
 memset(&gw->addr.sin_addr, 0, 4);
 if (gw->addr.sin_port) {
 /* If we've already got a port, make it the default rather than absolute */
 gw->defaddr.sin_port = gw->addr.sin_port;
 gw->addr.sin_port = 0;
 }
 } else {
 /* Non-dynamic. Make sure we become that way if we're not */
 AST_SCHED_DEL(sched, gw->expire);
 gw->dynamic = 0;
 {
 struct ast_sockaddr tmp;

 ast_sockaddr_from_sin(&tmp, &gw->addr);
 if (ast_get_ip(&tmp, v->value)) {
 if (!gw_reload) {
 ast_mutex_destroy(&gw->msgs_lock);
 ast_free(gw);
 }
 return NULL;
 }
 ast_sockaddr_to_sin(&tmp, &gw->addr);
 }
 }
 } else if (!strcasecmp(v->name, "defaultip")) {
 struct ast_sockaddr tmp;

 ast_sockaddr_from_sin(&tmp, &gw->defaddr);
 if (ast_get_ip(&tmp, v->value)) {
 if (!gw_reload) {
 ast_mutex_destroy(&gw->msgs_lock);
 ast_free(gw);
 }
 return NULL;
 }
 ast_sockaddr_to_sin(&tmp, &gw->defaddr);
 } else if (!strcasecmp(v->name, "permit") ||
 !strcasecmp(v->name, "deny")) {
 int acl_error = 0;
 gw->ha = ast_append_ha(v->name, v->value, gw->ha, &acl_error);
 if (acl_error) {
 ast_log(LOG_ERROR, "Invalid ACL '%s' specified for MGCP gateway '%s' on line %d. Not creating.\n",
 v->value, cat, v->lineno);
 if (!gw_reload) {
 ast_mutex_destroy(&gw->msgs_lock);
 ast_free(gw);
 } else {
 gw->delme = 1;
 }
 return NULL;
 }
 } else if (!strcasecmp(v->name, "port")) {
 gw->addr.sin_port = htons(atoi(v->value));
 } else if (!strcasecmp(v->name, "context")) {
 ast_copy_string(context, v->value, sizeof(context));
 } else if (!strcasecmp(v->name, "dtmfmode")) {
 if (!strcasecmp(v->value, "inband"))
 dtmfmode = MGCP_DTMF_INBAND;
 else if (!strcasecmp(v->value, "rfc2833"))
 dtmfmode = MGCP_DTMF_RFC2833;
 else if (!strcasecmp(v->value, "hybrid"))
 dtmfmode = MGCP_DTMF_HYBRID;
 else if (!strcasecmp(v->value, "none"))
 dtmfmode = 0;
 else
 ast_log(LOG_WARNING, "'%s' is not a valid DTMF mode at line %d\n", v->value, v->lineno);
 } else if (!strcasecmp(v->name, "nat")) {
 nat = ast_true(v->value);
 } else if (!strcasecmp(v->name, "ncs")) {
 ncs = ast_true(v->value);
 } else if (!strcasecmp(v->name, "hangupongateremove")) {
 hangupongateremove = ast_true(v->value);
 } else if (!strcasecmp(v->name, "pktcgatealloc")) {
 pktcgatealloc = ast_true(v->value);
 } else if (!strcasecmp(v->name, "callerid")) {
 if (!strcasecmp(v->value, "asreceived")) {
 cid_num[0] = '\0';
 cid_name[0] = '\0';
 } else {
 ast_callerid_split(v->value, cid_name, sizeof(cid_name), cid_num, sizeof(cid_num));
 }
 } else if (!strcasecmp(v->name, "language")) {
 ast_copy_string(language, v->value, sizeof(language));
 } else if (!strcasecmp(v->name, "accountcode")) {
 ast_copy_string(accountcode, v->value, sizeof(accountcode));
 } else if (!strcasecmp(v->name, "amaflags")) {
 y = ast_channel_string2amaflag(v->value);
 if (y < 0) {
 ast_log(LOG_WARNING, "Invalid AMA flags: %s at line %d\n", v->value, v->lineno);
 } else {
 amaflags = y;
 }
 } else if (!strcasecmp(v->name, "setvar")) {
 chanvars = add_var(v->value, chanvars);
 } else if (!strcasecmp(v->name, "clearvars")) {
 if (chanvars) {
 ast_variables_destroy(chanvars);
 chanvars = NULL;
 }
 } else if (!strcasecmp(v->name, "musiconhold")) {
 ast_copy_string(musicclass, v->value, sizeof(musicclass));
 } else if (!strcasecmp(v->name, "parkinglot")) {
 ast_copy_string(parkinglot, v->value, sizeof(parkinglot));
 } else if (!strcasecmp(v->name, "callgroup")) {
 cur_callergroup = ast_get_group(v->value);
 } else if (!strcasecmp(v->name, "pickupgroup")) {
 cur_pickupgroup = ast_get_group(v->value);
 } else if (!strcasecmp(v->name, "immediate")) {
 immediate = ast_true(v->value);
 } else if (!strcasecmp(v->name, "cancallforward")) {
 cancallforward = ast_true(v->value);
 } else if (!strcasecmp(v->name, "singlepath")) {
 singlepath = ast_true(v->value);
 } else if (!strcasecmp(v->name, "directmedia") || !strcasecmp(v->name, "canreinvite")) {
 directmedia = ast_true(v->value);
 } else if (!strcasecmp(v->name, "mailbox")) {
 ast_copy_string(mailbox, v->value, sizeof(mailbox));
 } else if (!strcasecmp(v->name, "hasvoicemail")) {
 if (ast_true(v->value) && ast_strlen_zero(mailbox)) {
 /*
 * hasvoicemail is a users.conf legacy voicemail enable method.
 * hasvoicemail is only going to work for app_voicemail mailboxes.
 */
 if (strchr(gw->name, '@')) {
 ast_copy_string(mailbox, gw->name, sizeof(mailbox));
 } else {
 snprintf(mailbox, sizeof(mailbox), "%s@default", gw->name);
 }
 }
 } else if (!strcasecmp(v->name, "adsi")) {
 adsi = ast_true(v->value);
 } else if (!strcasecmp(v->name, "callreturn")) {
 callreturn = ast_true(v->value);
 } else if (!strcasecmp(v->name, "callwaiting")) {
 callwaiting = ast_true(v->value);
 } else if (!strcasecmp(v->name, "slowsequence")) {
 slowsequence = ast_true(v->value);
 } else if (!strcasecmp(v->name, "transfer")) {
 transfer = ast_true(v->value);
 } else if (!strcasecmp(v->name, "threewaycalling")) {
 threewaycalling = ast_true(v->value);
 } else if (!strcasecmp(v->name, "wcardep")) {
 /* locate existing endpoint */
 for (e = gw->endpoints; e; e = e->next) {
 if (!strcasecmp(v->value, e->name)) {
 /* endpoint already exists */
 e->delme = 0;
 ep_reload = 1;
 break;
 }
 }

 if (!e) {
 /* Allocate wildcard endpoint */
 e = ast_calloc(1, sizeof(*e));
 ep_reload = 0;
 }

 if (e) {
 if (!ep_reload) {
 memset(e, 0, sizeof(struct mgcp_endpoint));
 ast_mutex_init(&e->lock);
 ast_mutex_init(&e->rqnt_queue_lock);
 ast_mutex_init(&e->cmd_queue_lock);
 e->cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
 ast_copy_string(e->name, v->value, sizeof(e->name));
 e->needaudit = 1;
 }
 ast_copy_string(gw->wcardep, v->value, sizeof(gw->wcardep));
 /* XXX Should we really check for uniqueness?? XXX */
 ast_copy_string(e->accountcode, accountcode, sizeof(e->accountcode));
 ast_copy_string(e->context, context, sizeof(e->context));
 ast_copy_string(e->cid_num, cid_num, sizeof(e->cid_num));
 ast_copy_string(e->cid_name, cid_name, sizeof(e->cid_name));
 ast_copy_string(e->language, language, sizeof(e->language));
 ast_copy_string(e->musicclass, musicclass, sizeof(e->musicclass));
 ast_copy_string(e->mailbox, mailbox, sizeof(e->mailbox));
 ast_copy_string(e->parkinglot, parkinglot, sizeof(e->parkinglot));
 if (!ast_strlen_zero(e->mailbox)) {
 /* This module does not handle MWI in an event-based manner. However, it
 * subscribes to MWI for each mailbox that is configured so that the core
 * knows that we care about it. Then, chan_mgcp will get the MWI from the
 * event cache instead of checking the mailbox directly. */
 e->mwi_event_sub = ast_mwi_subscribe_pool(e->mailbox, stasis_subscription_cb_noop, NULL);
 }
 snprintf(e->rqnt_ident, sizeof(e->rqnt_ident), "%08lx", (unsigned long)ast_random());
 e->msgstate = -1;
 e->amaflags = amaflags;
 ast_format_cap_append_from_cap(e->cap, global_capability, AST_MEDIA_TYPE_UNKNOWN);
 e->parent = gw;
 e->ncs = ncs;
 e->dtmfmode = dtmfmode;
 if (!ep_reload && e->sub && e->sub->rtp) {
 e->dtmfmode |= MGCP_DTMF_INBAND;
 }
 e->adsi = adsi;
 e->type = TYPE_LINE;
 e->immediate = immediate;
 e->callgroup=cur_callergroup;
 e->pickupgroup=cur_pickupgroup;
 e->callreturn = callreturn;
 e->cancallforward = cancallforward;
 e->singlepath = singlepath;
 e->directmedia = directmedia;
 e->callwaiting = callwaiting;
 e->hascallwaiting = callwaiting;
 e->slowsequence = slowsequence;
 e->transfer = transfer;
 e->threewaycalling = threewaycalling;
 e->onhooktime = time(NULL);
 /* ASSUME we're onhook */
 e->hookstate = MGCP_ONHOOK;
 e->chanvars = copy_vars(chanvars);
 if (!ep_reload) {
 /*snprintf(txident, sizeof(txident), "%08lx", (unsigned long)ast_random());*/
 for (i = 0; i < MAX_SUBS; i++) {
 sub = ast_calloc(1, sizeof(*sub));
 if (sub) {
 ast_verb(3, "Allocating subchannel '%d' on %s@%s\n", i, e->name, gw->name);
 ast_mutex_init(&sub->lock);
 ast_mutex_init(&sub->cx_queue_lock);
 sub->parent = e;
 sub->id = i;
 snprintf(sub->txident, sizeof(sub->txident), "%08lx", (unsigned long)ast_random());
 /*stnrcpy(sub->txident, txident, sizeof(sub->txident) - 1);*/
 sub->cxmode = MGCP_CX_INACTIVE;
 sub->nat = nat;
 sub->gate = NULL;
 sub->sdpsent = 0;
 sub->next = e->sub;
 e->sub = sub;
 } else {
 /* XXX Should find a way to clean up our memory */
 ast_log(LOG_WARNING, "Out of memory allocating subchannel\n");
 return NULL;
 }
 }
 /* Make out subs a circular linked list so we can always sping through the whole bunch */
 /* find the end of the list */
 for (sub = e->sub; sub && sub->next; sub = sub->next);
 /* set the last sub->next to the first sub */
 sub->next = e->sub;

 e->next = gw->endpoints;
 gw->endpoints = e;
 }
 }
 } else if (!strcasecmp(v->name, "trunk") ||
 !strcasecmp(v->name, "line")) {

 /* locate existing endpoint */
 for (e = gw->endpoints; e; e = e->next) {
 if (!strcasecmp(v->value, e->name)) {
 /* endpoint already exists */
 e->delme = 0;
 ep_reload = 1;
 break;
 }
 }

 if (!e) {
 e = ast_calloc(1, sizeof(*e));
 ep_reload = 0;
 }

 if (e) {
 if (!ep_reload) {
 ast_mutex_init(&e->lock);
 ast_mutex_init(&e->rqnt_queue_lock);
 ast_mutex_init(&e->cmd_queue_lock);
 e->cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
 ast_copy_string(e->name, v->value, sizeof(e->name));
 e->needaudit = 1;
 }
 /* XXX Should we really check for uniqueness?? XXX */
 ast_copy_string(e->accountcode, accountcode, sizeof(e->accountcode));
 ast_copy_string(e->context, context, sizeof(e->context));
 ast_copy_string(e->cid_num, cid_num, sizeof(e->cid_num));
 ast_copy_string(e->cid_name, cid_name, sizeof(e->cid_name));
 ast_copy_string(e->language, language, sizeof(e->language));
 ast_copy_string(e->musicclass, musicclass, sizeof(e->musicclass));
 ast_copy_string(e->mailbox, mailbox, sizeof(e->mailbox));
 ast_copy_string(e->parkinglot, parkinglot, sizeof(e->parkinglot));
 if (!ast_strlen_zero(mailbox)) {
 ast_verb(3, "Setting mailbox '%s' on %s@%s\n", mailbox, gw->name, e->name);
 }
 if (!ep_reload) {
 /* XXX potential issue due to reload */
 e->msgstate = -1;
 e->parent = gw;
 }
 e->amaflags = amaflags;
 ast_format_cap_append_from_cap(e->cap, global_capability, AST_MEDIA_TYPE_UNKNOWN);
 e->dtmfmode = dtmfmode;
 e->ncs = ncs;
 e->pktcgatealloc = pktcgatealloc;
 e->hangupongateremove = hangupongateremove;
 e->adsi = adsi;
 e->type = (!strcasecmp(v->name, "trunk")) ? TYPE_TRUNK : TYPE_LINE;
 e->immediate = immediate;
 e->callgroup=cur_callergroup;
 e->pickupgroup=cur_pickupgroup;
 e->callreturn = callreturn;
 e->cancallforward = cancallforward;
 e->directmedia = directmedia;
 e->singlepath = singlepath;
 e->callwaiting = callwaiting;
 e->hascallwaiting = callwaiting;
 e->slowsequence = slowsequence;
 e->transfer = transfer;
 e->threewaycalling = threewaycalling;

 /* If we already have a valid chanvars, it's not a new endpoint (it's a reload),
 so first, free previous mem
 */
 if (e->chanvars) {
 ast_variables_destroy(e->chanvars);
 e->chanvars = NULL;
 }
 e->chanvars = copy_vars(chanvars);

 if (!ep_reload) {
 e->onhooktime = time(NULL);
 /* ASSUME we're onhook */
 e->hookstate = MGCP_ONHOOK;
 snprintf(e->rqnt_ident, sizeof(e->rqnt_ident), "%08lx", (unsigned long)ast_random());
 }

 for (i = 0, sub = NULL; i < MAX_SUBS; i++) {
 if (!ep_reload) {
 sub = ast_calloc(1, sizeof(*sub));
 } else {
 if (!sub) {
 sub = e->sub;
 } else {
 sub = sub->next;
 }
 }

 if (sub) {
 if (!ep_reload) {
 ast_verb(3, "Allocating subchannel '%d' on %s@%s\n", i, e->name, gw->name);
 ast_mutex_init(&sub->lock);
 ast_mutex_init(&sub->cx_queue_lock);
 ast_copy_string(sub->magic, MGCP_SUBCHANNEL_MAGIC, sizeof(sub->magic));
 sub->parent = e;
 sub->id = i;
 snprintf(sub->txident, sizeof(sub->txident), "%08lx", (unsigned long)ast_random());
 sub->cxmode = MGCP_CX_INACTIVE;
 sub->next = e->sub;
 e->sub = sub;
 }
 sub->nat = nat;
 } else {
 /* XXX Should find a way to clean up our memory */
 ast_log(LOG_WARNING, "Out of memory allocating subchannel\n");
 return NULL;
 }
 }
 if (!ep_reload) {
 /* Make out subs a circular linked list so we can always sping through the whole bunch */
 /* find the end of the list */
 for (sub = e->sub; sub && sub->next; sub = sub->next);
 /* set the last sub->next to the first sub */
 sub->next = e->sub;

 e->next = gw->endpoints;
 gw->endpoints = e;
 }
 }
 } else if (!strcasecmp(v->name, "name") || !strcasecmp(v->name, "lines")) {
 /* just eliminate realtime warnings */
 } else {
 ast_log(LOG_WARNING, "Don't know keyword '%s' at line %d\n", v->name, v->lineno);
 }
 }
 if (!ntohl(gw->addr.sin_addr.s_addr) && !gw->dynamic) {
 ast_log(LOG_WARNING, "Gateway '%s' lacks IP address and isn't dynamic\n", gw->name);
 if (!gw_reload) {
 ast_mutex_destroy(&gw->msgs_lock);
 ast_free(gw);
 }

 /* Return NULL */
 gw_reload = 1;
 } else {
 gw->defaddr.sin_family = AF_INET;
 gw->addr.sin_family = AF_INET;
 if (gw->defaddr.sin_addr.s_addr && !ntohs(gw->defaddr.sin_port)) {
 gw->defaddr.sin_port = htons(DEFAULT_MGCP_GW_PORT);
 }
 if (gw->addr.sin_addr.s_addr && !ntohs(gw->addr.sin_port)) {
 gw->addr.sin_port = htons(DEFAULT_MGCP_GW_PORT);
 }
 {
 struct ast_sockaddr tmp1, tmp2;
 struct sockaddr_in tmp3 = {0,};

 tmp3.sin_addr = gw->ourip;
 ast_sockaddr_from_sin(&tmp1, &gw->addr);
 ast_sockaddr_from_sin(&tmp2, &tmp3);
 if (gw->addr.sin_addr.s_addr && ast_ouraddrfor(&tmp1, &tmp2)) {
 memcpy(&gw->ourip, &__ourip, sizeof(gw->ourip));
 } else {
 ast_sockaddr_to_sin(&tmp2, &tmp3);
 gw->ourip = tmp3.sin_addr;
 }
 }
 }

 if (chanvars) {
 ast_variables_destroy(chanvars);
 chanvars = NULL;
 }
 return (gw_reload ? NULL : gw);
}

static enum ast_rtp_glue_result mgcp_get_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance **instance)
{
 struct mgcp_subchannel *sub = NULL;

 if (!(sub = ast_channel_tech_pvt(chan)) || !(sub->rtp))
 return AST_RTP_GLUE_RESULT_FORBID;

 ao2_ref(sub->rtp, +1);
 *instance = sub->rtp;

 if (sub->parent->directmedia)
 return AST_RTP_GLUE_RESULT_REMOTE;
 else
 return AST_RTP_GLUE_RESULT_LOCAL;
}

static int mgcp_set_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance *rtp, struct ast_rtp_instance *vrtp, struct ast_rtp_instance *trtp, const struct ast_format_cap *cap, int nat_active)
{
 /* XXX Is there such thing as video support with MGCP? XXX */
 struct mgcp_subchannel *sub;
 sub = ast_channel_tech_pvt(chan);
 if (sub && !sub->alreadygone) {
 transmit_modify_with_sdp(sub, rtp, cap);
 return 0;
 }
 return -1;
}

static void mgcp_get_codec(struct ast_channel *chan, struct ast_format_cap *result)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(chan);
 struct mgcp_endpoint *p = sub->parent;

 ast_format_cap_append_from_cap(result, p->cap, AST_MEDIA_TYPE_UNKNOWN);
}

static struct ast_rtp_glue mgcp_rtp_glue = {
 .type = "MGCP",
 .get_rtp_info = mgcp_get_rtp_peer,
 .update_peer = mgcp_set_rtp_peer,
 .get_codec = mgcp_get_codec,
};


static int acf_channel_read(struct ast_channel *chan, const char *funcname, char *args, char *buf, size_t buflen)
{
 struct mgcp_subchannel *sub = ast_channel_tech_pvt(chan);
 int res = 0;

 /* Sanity check */
 if (!chan || ast_channel_tech(chan) != &mgcp_tech) {
 ast_log(LOG_ERROR, "This function requires a valid MGCP channel\n");
 return -1;
 }

 if (!strcasecmp(args, "ncs")) {
 snprintf(buf, buflen, "%s", sub->parent->ncs ? "yes":"no");
 } else {
 res = -1;
 }
 return res;
}


static void destroy_endpoint(struct mgcp_endpoint *e)
{
 struct mgcp_subchannel *sub = e->sub->next, *s;
 int i;

 for (i = 0; i < MAX_SUBS; i++) {
 ast_mutex_lock(&sub->lock);
 if (!ast_strlen_zero(sub->cxident)) {
 transmit_connection_del(sub);
 }
 if (sub->rtp) {
 ast_rtp_instance_destroy(sub->rtp);
 sub->rtp = NULL;
 }
 memset(sub->magic, 0, sizeof(sub->magic));
 mgcp_queue_hangup(sub);
 dump_cmd_queues(NULL, sub);
 if(sub->gate) {
 sub->gate->tech_pvt = NULL;
 sub->gate->got_dq_gi = NULL;
 sub->gate->gate_remove = NULL;
 sub->gate->gate_open = NULL;
 }
 ast_mutex_unlock(&sub->lock);
 sub = sub->next;
 }

 if (e->dsp) {
 ast_dsp_free(e->dsp);
 }

 dump_queue(e->parent, e);
 dump_cmd_queues(e, NULL);

 sub = e->sub;
 for (i = 0; (i < MAX_SUBS) && sub; i++) {
 s = sub;
 sub = sub->next;
 ast_mutex_destroy(&s->lock);
 ast_mutex_destroy(&s->cx_queue_lock);
 ast_free(s);
 }

 if (e->mwi_event_sub) {
 e->mwi_event_sub = ast_mwi_unsubscribe(e->mwi_event_sub);
 }

 if (e->chanvars) {
 ast_variables_destroy(e->chanvars);
 e->chanvars = NULL;
 }

 ast_mutex_destroy(&e->lock);
 ast_mutex_destroy(&e->rqnt_queue_lock);
 ast_mutex_destroy(&e->cmd_queue_lock);
 ao2_ref(e->cap, -1);
 ast_free(e);
}

static void destroy_gateway(struct mgcp_gateway *g)
{
 if (g->ha)
 ast_free_ha(g->ha);

 dump_queue(g, NULL);

 ast_free(g);
}

static void prune_gateways(void)
{
 struct mgcp_gateway *g, *z, *r;
 struct mgcp_endpoint *e, *p, *t;

 ast_mutex_lock(&gatelock);

 /* prune gateways */
 for (z = NULL, g = gateways; g;) {
 /* prune endpoints */
 for (p = NULL, e = g->endpoints; e; ) {
 if (!g->realtime && (e->delme || g->delme)) {
 t = e;
 e = e->next;
 if (!p)
 g->endpoints = e;
 else
 p->next = e;
 destroy_endpoint(t);
 } else {
 p = e;
 e = e->next;
 }
 }

 if (g->delme) {
 r = g;
 g = g->next;
 if (!z)
 gateways = g;
 else
 z->next = g;

 destroy_gateway(r);
 } else {
 z = g;
 g = g->next;
 }
 }

 ast_mutex_unlock(&gatelock);
}

static struct ast_variable *add_var(const char *buf, struct ast_variable *list)
{
 struct ast_variable *tmpvar = NULL;
 char *varname = ast_strdupa(buf), *varval = NULL;

 if ((varval = strchr(varname, '='))) {
 *varval++ = '\0';
 if ((tmpvar = ast_variable_new(varname, varval, ""))) {
 tmpvar->next = list;
 list = tmpvar;
 }
 }
 return list;
}

/*! \brief
 * duplicate a list of channel variables, \return the copy.
 */
static struct ast_variable *copy_vars(struct ast_variable *src)
{
 struct ast_variable *res = NULL, *tmp, *v = NULL;

 for (v = src ; v ; v = v->next) {
 if ((tmp = ast_variable_new(v->name, v->value, v->file))) {
 tmp->next = res;
 res = tmp;
 }
 }
 return res;
}


static int reload_config(int reload)
{
 struct ast_config *cfg;
 struct ast_variable *v;
 struct mgcp_gateway *g;
 struct mgcp_endpoint *e;
 char *cat;
 struct ast_hostent ahp;
 struct hostent *hp;
 struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };

 if (gethostname(ourhost, sizeof(ourhost)-1)) {
 ast_log(LOG_WARNING, "Unable to get hostname, MGCP disabled\n");
 return 0;
 }
 cfg = ast_config_load(config, config_flags);

 /* We *must* have a config file otherwise stop immediately */
 if (!cfg) {
 ast_log(LOG_NOTICE, "Unable to load config %s, MGCP disabled\n", config);
 return 0;
 } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
 return 0;
 } else if (cfg == CONFIG_STATUS_FILEINVALID) {
 ast_log(LOG_ERROR, "Config file %s is in an invalid format. Aborting.\n", config);
 return 0;
 }

 memset(&bindaddr, 0, sizeof(bindaddr));
 dtmfmode = 0;

 /* Copy the default jb config over global_jbconf */
 memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));

 for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
 /* handle jb conf */
 if (!ast_jb_read_conf(&global_jbconf, v->name, v->value)) {
 continue;
 }

 /* Create the interface list */
 if (!strcasecmp(v->name, "bindaddr")) {
 if (!(hp = ast_gethostbyname(v->value, &ahp))) {
 ast_log(LOG_WARNING, "Invalid address: %s\n", v->value);
 } else {
 memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
 }
 } else if (!strcasecmp(v->name, "allow")) {
 ast_format_cap_update_by_allow_disallow(global_capability, v->value, 1);
 } else if (!strcasecmp(v->name, "disallow")) {
 ast_format_cap_update_by_allow_disallow(global_capability, v->value, 0);
 } else if (!strcasecmp(v->name, "tos")) {
 if (ast_str2tos(v->value, &qos.tos)) {
 ast_log(LOG_WARNING, "Invalid tos value at line %d, refer to QoS documentation\n", v->lineno);
 }
 } else if (!strcasecmp(v->name, "tos_audio")) {
 if (ast_str2tos(v->value, &qos.tos_audio))
 ast_log(LOG_WARNING, "Invalid tos_audio value at line %d, refer to QoS documentation\n", v->lineno);
 } else if (!strcasecmp(v->name, "cos")) {
 if (ast_str2cos(v->value, &qos.cos))
 ast_log(LOG_WARNING, "Invalid cos value at line %d, refer to QoS documentation\n", v->lineno);
 } else if (!strcasecmp(v->name, "cos_audio")) {
 if (ast_str2cos(v->value, &qos.cos_audio))
 ast_log(LOG_WARNING, "Invalid cos_audio value at line %d, refer to QoS documentation\n", v->lineno);
 } else if (!strcasecmp(v->name, "port")) {
 if (sscanf(v->value, "%5d", &ourport) == 1) {
 bindaddr.sin_port = htons(ourport);
 } else {
 ast_log(LOG_WARNING, "Invalid port number '%s' at line %d of %s\n", v->value, v->lineno, config);
 }
 } else if (!strcasecmp(v->name, "firstdigittimeout")) {
 firstdigittimeout = atoi(v->value);
 } else if (!strcasecmp(v->name, "gendigittimeout")) {
 gendigittimeout = atoi(v->value);
 } else if (!strcasecmp(v->name, "matchdigittimeout")) {
 matchdigittimeout = atoi(v->value);
 }
 }

 /* mark existing entries for deletion */
 ast_mutex_lock(&gatelock);
 for (g = gateways; g; g = g->next) {
 g->delme = 1;
 for (e = g->endpoints; e; e = e->next) {
 e->delme = 1;
 }
 }
 ast_mutex_unlock(&gatelock);

 for (cat = ast_category_browse(cfg, NULL); cat; cat = ast_category_browse(cfg, cat)) {
 if (strcasecmp(cat, "general")) {
 ast_mutex_lock(&gatelock);
 if ((g = build_gateway(cat, ast_variable_browse(cfg, cat)))) {
 ast_verb(3, "Added gateway '%s'\n", g->name);
 g->next = gateways;
 gateways = g;
 }
 ast_mutex_unlock(&gatelock);

 /* FS: process queue and IO */
 if (monitor_thread == pthread_self()) {
 if (sched) ast_sched_runq(sched);
 if (io) ast_io_wait(io, 10);
 }
 }
 }

 /* prune deleted entries etc. */
 prune_gateways();

 if (ntohl(bindaddr.sin_addr.s_addr)) {
 memcpy(&__ourip, &bindaddr.sin_addr, sizeof(__ourip));
 } else {
 hp = ast_gethostbyname(ourhost, &ahp);
 if (!hp) {
 ast_log(LOG_WARNING, "Unable to get our IP address, MGCP disabled\n");
 ast_config_destroy(cfg);
 return 0;
 }
 memcpy(&__ourip, hp->h_addr, sizeof(__ourip));
 }
 if (!ntohs(bindaddr.sin_port))
 bindaddr.sin_port = htons(DEFAULT_MGCP_CA_PORT);
 bindaddr.sin_family = AF_INET;
 ast_mutex_lock(&netlock);
 if (mgcpsock > -1)
 close(mgcpsock);

 if (mgcpsock_read_id != NULL)
 ast_io_remove(io, mgcpsock_read_id);
 mgcpsock_read_id = NULL;

 mgcpsock = socket(AF_INET, SOCK_DGRAM, 0);
 if (mgcpsock < 0) {
 ast_log(LOG_WARNING, "Unable to create MGCP socket: %s\n", strerror(errno));
 } else {
 if (bind(mgcpsock, (struct sockaddr *)&bindaddr, sizeof(bindaddr)) < 0) {
 ast_log(LOG_WARNING, "Failed to bind to %s:%d: %s\n",
 ast_inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port),
 strerror(errno));
 close(mgcpsock);
 mgcpsock = -1;
 } else {
 ast_verb(2, "MGCP Listening on %s:%d\n",
 ast_inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port));
 ast_set_qos(mgcpsock, qos.tos, qos.cos, "MGCP");
 }
 }
 ast_mutex_unlock(&netlock);
 ast_config_destroy(cfg);

 /* send audit only to the new endpoints */
 for (g = gateways; g; g = g->next) {
 for (e = g->endpoints; e && e->needaudit; e = e->next) {
 e->needaudit = 0;
 transmit_audit_endpoint(e);
 ast_verb(3, "MGCP Auditing endpoint %s@%s for hookstate\n", e->name, g->name);
 }
 }

 return 0;
}

/*!
 * \brief Load the module
 *
 * Module loading including tests for configuration or dependencies.
 * This function can return AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_DECLINE,
 * or AST_MODULE_LOAD_SUCCESS. If a dependency or environment variable fails
 * tests return AST_MODULE_LOAD_FAILURE. If the module can not load the
 * configuration file or other non-critical problem return
 * AST_MODULE_LOAD_DECLINE. On success return AST_MODULE_LOAD_SUCCESS.
 */
static int load_module(void)
{
 if (!(global_capability = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
 return AST_MODULE_LOAD_DECLINE;
 }
 if (!(mgcp_tech.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
 ao2_ref(global_capability, -1);
 return AST_MODULE_LOAD_DECLINE;
 }
 ast_format_cap_append(global_capability, ast_format_ulaw, 0);
 ast_format_cap_append(mgcp_tech.capabilities, ast_format_ulaw, 0);
 ast_format_cap_append(mgcp_tech.capabilities, ast_format_alaw, 0);
 if (!(sched = ast_sched_context_create())) {
 ast_log(LOG_WARNING, "Unable to create schedule context\n");
 ao2_ref(global_capability, -1);
 ao2_ref(mgcp_tech.capabilities, -1);
 return AST_MODULE_LOAD_DECLINE;
 }

 if (!(io = io_context_create())) {
 ast_log(LOG_WARNING, "Unable to create I/O context\n");
 ast_sched_context_destroy(sched);
 ao2_ref(global_capability, -1);
 ao2_ref(mgcp_tech.capabilities, -1);
 return AST_MODULE_LOAD_DECLINE;
 }

 if (reload_config(0)) {
 ao2_ref(global_capability, -1);
 ao2_ref(mgcp_tech.capabilities, -1);
 return AST_MODULE_LOAD_DECLINE;
 }

 /* Make sure we can register our mgcp channel type */
 if (ast_channel_register(&mgcp_tech)) {
 ast_log(LOG_ERROR, "Unable to register channel class 'MGCP'\n");
 io_context_destroy(io);
 ast_sched_context_destroy(sched);
 ao2_ref(global_capability, -1);
 ao2_ref(mgcp_tech.capabilities, -1);
 return AST_MODULE_LOAD_DECLINE;
 }

 ast_rtp_glue_register(&mgcp_rtp_glue);
 ast_cli_register_multiple(cli_mgcp, sizeof(cli_mgcp) / sizeof(struct ast_cli_entry));

 /* And start the monitor for the first time */
 restart_monitor();

 return AST_MODULE_LOAD_SUCCESS;
}

static char *mgcp_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
 static int deprecated = 0;

 if (e) {
 switch (cmd) {
 case CLI_INIT:
 e->command = "mgcp reload";
 e->usage =
 "Usage: mgcp reload\n"
 " 'mgcp reload' is deprecated. Please use 'reload chan_mgcp.so' instead.\n";
 return NULL;
 case CLI_GENERATE:
 return NULL;
 }
 }

 if (!deprecated && a && a->argc > 0) {
 ast_log(LOG_WARNING, "'mgcp reload' is deprecated. Please use 'reload chan_mgcp.so' instead.\n");
 deprecated = 1;
 }

 ast_mutex_lock(&mgcp_reload_lock);
 if (mgcp_reloading) {
 ast_verbose("Previous mgcp reload not yet done\n");
 } else {
 mgcp_reloading = 1;
 }
 ast_mutex_unlock(&mgcp_reload_lock);
 restart_monitor();
 return CLI_SUCCESS;
}

static int reload(void)
{
 mgcp_reload(NULL, 0, NULL);
 return 0;
}

static int unload_module(void)
{
 struct mgcp_endpoint *e;
 struct mgcp_gateway *g;

 /* Check to see if we're reloading */
 if (ast_mutex_trylock(&mgcp_reload_lock)) {
 ast_log(LOG_WARNING, "MGCP is currently reloading. Unable to remove module.\n");
 return -1;
 } else {
 mgcp_reloading = 1;
 ast_mutex_unlock(&mgcp_reload_lock);
 }

 /* First, take us out of the channel loop */
 ast_channel_unregister(&mgcp_tech);

 /* Shut down the monitoring thread */
 if (!ast_mutex_lock(&monlock)) {
 if (monitor_thread && (monitor_thread != AST_PTHREADT_STOP)) {
 pthread_cancel(monitor_thread);
 pthread_kill(monitor_thread, SIGURG);
 pthread_join(monitor_thread, NULL);
 }
 monitor_thread = AST_PTHREADT_STOP;
 ast_mutex_unlock(&monlock);
 } else {
 ast_log(LOG_WARNING, "Unable to lock the monitor\n");
 /* We always want to leave this in a consistent state */
 ast_channel_register(&mgcp_tech);
 mgcp_reloading = 0;
 mgcp_reload(NULL, 0, NULL);
 return -1;
 }

 if (!ast_mutex_lock(&gatelock)) {
 for (g = gateways; g; g = g->next) {
 g->delme = 1;
 for (e = g->endpoints; e; e = e->next) {
 e->delme = 1;
 }
 }

 prune_gateways();
 ast_mutex_unlock(&gatelock);
 } else {
 ast_log(LOG_WARNING, "Unable to lock the gateways list.\n");
 /* We always want to leave this in a consistent state */
 ast_channel_register(&mgcp_tech);
 /* Allow the monitor to restart */
 monitor_thread = AST_PTHREADT_NULL;
 mgcp_reloading = 0;
 mgcp_reload(NULL, 0, NULL);
 return -1;
 }

 if (mgcpsock > -1) {
 close(mgcpsock);
 }
 ast_rtp_glue_unregister(&mgcp_rtp_glue);
 ast_cli_unregister_multiple(cli_mgcp, sizeof(cli_mgcp) / sizeof(struct ast_cli_entry));
 ast_sched_context_destroy(sched);

 ao2_ref(global_capability, -1);
 global_capability = NULL;
 ao2_ref(mgcp_tech.capabilities, -1);
 mgcp_tech.capabilities = NULL;

 return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Media Gateway Control Protocol (MGCP)",
 .support_level = AST_MODULE_SUPPORT_EXTENDED,
 .load = load_module,
 .unload = unload_module,
 .reload = reload,
 .load_pri = AST_MODPRI_CHANNEL_DRIVER,
 .optional_modules = "res_pktccops",
);