chan_dahdi.h

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013 Digium, Inc.
 *
 * Richard Mudgett <[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 DAHDI internal API definitions.
 *
 * \author Richard Mudgett <[email protected]>
 *
 * See Also:
 * \arg \ref AstCREDITS
 */

#ifndef _ASTERISK_CHAN_DAHDI_H
#define _ASTERISK_CHAN_DAHDI_H

#if defined(HAVE_OPENR2)
#include <openr2.h>
#endif /* defined(HAVE_OPENR2) */

#include <dahdi/user.h>
#include <dahdi/tonezone.h>

#include "asterisk/channel.h"
#include "asterisk/dsp.h"
#include "asterisk/app.h"
#include "asterisk/mwi.h"

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

/* ------------------------------------------------------------------- */

#if defined(HAVE_PRI)
struct sig_pri_span;
#endif /* defined(HAVE_PRI) */
#if defined(HAVE_SS7)
struct sig_ss7_linkset;
#endif /* defined(HAVE_SS7) */

#define SUB_REAL 0 /*!< Active call */
#define SUB_CALLWAIT 1 /*!< Call-Waiting call on hold */
#define SUB_THREEWAY 2 /*!< Three-way call */


struct distRingData {
 int ring[3];
 int range;
};
struct ringContextData {
 char contextData[AST_MAX_CONTEXT];
};
struct dahdi_distRings {
 struct distRingData ringnum[3];
 struct ringContextData ringContext[3];
};


extern const char * const subnames[];

struct dahdi_subchannel {
 int dfd;
 struct ast_channel *owner;
 int chan;
 short buffer[AST_FRIENDLY_OFFSET/2 + READ_SIZE];
 struct ast_frame f; /*!< One frame for each channel. How did this ever work before? */
 unsigned int needringing:1;
 unsigned int needbusy:1;
 unsigned int needcongestion:1;
 unsigned int needanswer:1;
 unsigned int needflash:1;
 unsigned int needhold:1;
 unsigned int needunhold:1;
 unsigned int linear:1;
 unsigned int inthreeway:1;
 struct dahdi_confinfo curconf;
};

#define MAX_SLAVES 4

/* States for sending MWI message
 * First three states are required for send Ring Pulse Alert Signal
 */
typedef enum {
 MWI_SEND_NULL = 0,
 MWI_SEND_SA,
 MWI_SEND_SA_WAIT,
 MWI_SEND_PAUSE,
 MWI_SEND_SPILL,
 MWI_SEND_CLEANUP,
 MWI_SEND_DONE,
} mwisend_states;

struct mwisend_info {
 struct timeval pause;
 mwisend_states mwisend_current;
};

/*! Specify the lists dahdi_pvt can be put in. */
enum DAHDI_IFLIST {
 DAHDI_IFLIST_NONE, /*!< The dahdi_pvt is not in any list. */
 DAHDI_IFLIST_MAIN, /*!< The dahdi_pvt is in the main interface list */
#if defined(HAVE_PRI)
 DAHDI_IFLIST_NO_B_CHAN, /*!< The dahdi_pvt is in a no B channel interface list */
#endif /* defined(HAVE_PRI) */
};

struct dahdi_pvt {
 ast_mutex_t lock; /*!< Channel private lock. */
 struct callerid_state *cs;
 struct ast_channel *owner; /*!< Our current active owner (if applicable) */
 /*!< Up to three channels can be associated with this call */

 struct dahdi_subchannel sub_unused; /*!< Just a safety precaution */
 struct dahdi_subchannel subs[3]; /*!< Sub-channels */
 struct dahdi_confinfo saveconf; /*!< Saved conference info */

 struct dahdi_pvt *slaves[MAX_SLAVES]; /*!< Slave to us (follows our conferencing) */
 struct dahdi_pvt *master; /*!< Master to us (we follow their conferencing) */
 int inconference; /*!< If our real should be in the conference */

 int bufsize; /*!< Size of the buffers */
 int buf_no; /*!< Number of buffers */
 int buf_policy; /*!< Buffer policy */
 int faxbuf_no; /*!< Number of Fax buffers */
 int faxbuf_policy; /*!< Fax buffer policy */
 int sig; /*!< Signalling style */
 /*!
 * \brief Nonzero if the signaling type is sent over a radio.
 * \note Set to a couple of nonzero values but it is only tested like a boolean.
 */
 int radio;
 int outsigmod; /*!< Outbound Signalling style (modifier) */
 int oprmode; /*!< "Operator Services" mode */
 struct dahdi_pvt *oprpeer; /*!< "Operator Services" peer tech_pvt ptr */
 /*! \brief Hardware Rx gain set by chan_dahdi.conf */
 float hwrxgain;
 /*! \brief Hardware Tx gain set by chan_dahdi.conf */
 float hwtxgain;
 /*! \brief Amount of gain to increase during caller id */
 float cid_rxgain;
 /*! \brief Software Rx gain set by chan_dahdi.conf */
 float rxgain;
 /*! \brief Software Tx gain set by chan_dahdi.conf */
 float txgain;

 float txdrc; /*!< Dynamic Range Compression factor. a number between 1 and 6ish */
 float rxdrc;

 int tonezone; /*!< tone zone for this chan, or -1 for default */
 enum DAHDI_IFLIST which_iflist; /*!< Which interface list is this structure listed? */
 struct dahdi_pvt *next; /*!< Next channel in list */
 struct dahdi_pvt *prev; /*!< Prev channel in list */

 /* flags */

 /*!
 * \brief TRUE if ADSI (Analog Display Services Interface) available
 * \note Set from the "adsi" value read in from chan_dahdi.conf
 */
 unsigned int adsi:1;
 /*!
 * \brief TRUE if we can use a polarity reversal to mark when an outgoing
 * call is answered by the remote party.
 * \note Set from the "answeronpolarityswitch" value read in from chan_dahdi.conf
 */
 unsigned int answeronpolarityswitch:1;
 /*!
 * \brief TRUE if busy detection is enabled.
 * (Listens for the beep-beep busy pattern.)
 * \note Set from the "busydetect" value read in from chan_dahdi.conf
 */
 unsigned int busydetect:1;
 /*!
 * \brief TRUE if call return is enabled.
 * (*69, if your dialplan doesn't catch this first)
 * \note Set from the "callreturn" value read in from chan_dahdi.conf
 */
 unsigned int callreturn:1;
 /*!
 * \brief TRUE if busy extensions will hear the call-waiting tone
 * and can use hook-flash to switch between callers.
 * \note Can be disabled by dialing *70.
 * \note Initialized with the "callwaiting" value read in from chan_dahdi.conf
 */
 unsigned int callwaiting:1;
 /*!
 * \brief TRUE if send caller ID for Call Waiting
 * \note Set from the "callwaitingcallerid" value read in from chan_dahdi.conf
 */
 unsigned int callwaitingcallerid:1;
 /*!
 * \brief TRUE if support for call forwarding enabled.
 * Dial *72 to enable call forwarding.
 * Dial *73 to disable call forwarding.
 * \note Set from the "cancallforward" value read in from chan_dahdi.conf
 */
 unsigned int cancallforward:1;
 /*!
 * \brief TRUE if support for call parking is enabled.
 * \note Set from the "canpark" value read in from chan_dahdi.conf
 */
 unsigned int canpark:1;
 /*! \brief TRUE if to wait for a DTMF digit to confirm answer */
 unsigned int confirmanswer:1;
 /*!
 * \brief TRUE if the channel is to be destroyed on hangup.
 * (Used by pseudo channels.)
 */
 unsigned int destroy:1;
 unsigned int didtdd:1; /*!< flag to say its done it once */
 /*! \brief TRUE if analog type line dialed no digits in Dial() */
 unsigned int dialednone:1;
 /*!
 * \brief TRUE if in the process of dialing digits or sending something.
 * \note This is used as a receive squelch for ISDN until connected.
 */
 unsigned int dialing:1;
 /*! \brief TRUE if the transfer capability of the call is digital. */
 unsigned int digital:1;
 /*! \brief TRUE if Do-Not-Disturb is enabled, present only for non sig_analog */
 unsigned int dnd:1;
 /*! \brief XXX BOOLEAN Purpose??? */
 unsigned int echobreak:1;
 /*!
 * \brief TRUE if echo cancellation enabled when bridged.
 * \note Initialized with the "echocancelwhenbridged" value read in from chan_dahdi.conf
 * \note Disabled if the echo canceller is not setup.
 */
 unsigned int echocanbridged:1;
 /*! \brief TRUE if echo cancellation is turned on. */
 unsigned int echocanon:1;
 /*! \brief TRUE if a fax tone has already been handled. */
 unsigned int faxhandled:1;
 /*! TRUE if dynamic faxbuffers are configured for use, default is OFF */
 unsigned int usefaxbuffers:1;
 /*! TRUE while buffer configuration override is in use */
 unsigned int bufferoverrideinuse:1;
 /*! \brief TRUE if over a radio and dahdi_read() has been called. */
 unsigned int firstradio:1;
 /*!
 * \brief TRUE if the call will be considered "hung up" on a polarity reversal.
 * \note Set from the "hanguponpolarityswitch" value read in from chan_dahdi.conf
 */
 unsigned int hanguponpolarityswitch:1;
 /*! \brief TRUE if DTMF detection needs to be done by hardware. */
 unsigned int hardwaredtmf:1;
 /*!
 * \brief TRUE if the outgoing caller ID is blocked/hidden.
 * \note Caller ID can be disabled by dialing *67.
 * \note Caller ID can be enabled by dialing *82.
 * \note Initialized with the "hidecallerid" value read in from chan_dahdi.conf
 */
 unsigned int hidecallerid:1;
 /*!
 * \brief TRUE if hide just the name not the number for legacy PBX use.
 * \note Only applies to PRI channels.
 * \note Set from the "hidecalleridname" value read in from chan_dahdi.conf
 */
 unsigned int hidecalleridname:1;
 /*! \brief TRUE if DTMF detection is disabled. */
 unsigned int ignoredtmf:1;
 /*!
 * \brief TRUE if the channel should be answered immediately
 * without attempting to gather any digits.
 * \note Set from the "immediate" value read in from chan_dahdi.conf
 */
 unsigned int immediate:1;
 /*! \brief TRUE if in an alarm condition. */
 unsigned int inalarm:1;
 /*! \brief TRUE if TDD in MATE mode */
 unsigned int mate:1;
 /*! \brief TRUE if we originated the call leg. */
 unsigned int outgoing:1;
 /*!
 * \brief TRUE if busy extensions will hear the call-waiting tone
 * and can use hook-flash to switch between callers.
 * \note Set from the "callwaiting" value read in from chan_dahdi.conf
 */
 unsigned int permcallwaiting:1;
 /*!
 * \brief TRUE if the outgoing caller ID is blocked/restricted/hidden.
 * \note Set from the "hidecallerid" value read in from chan_dahdi.conf
 */
 unsigned int permhidecallerid:1;
 /*!
 * \brief TRUE if PRI congestion/busy indications are sent out-of-band.
 * \note Set from the "priindication" value read in from chan_dahdi.conf
 */
 unsigned int priindication_oob:1;
 /*!
 * \brief TRUE if PRI B channels are always exclusively selected.
 * \note Set from the "priexclusive" value read in from chan_dahdi.conf
 */
 unsigned int priexclusive:1;
 /*!
 * \brief TRUE if we will pulse dial.
 * \note Set from the "pulsedial" value read in from chan_dahdi.conf
 */
 unsigned int pulse:1;
 /*! \brief TRUE if a pulsed digit was detected. (Pulse dial phone detected) */
 unsigned int pulsedial:1;
 unsigned int restartpending:1; /*!< flag to ensure counted only once for restart */
 /*!
 * \brief TRUE if caller ID is restricted.
 * \note Set but not used. Should be deleted. Redundant with permhidecallerid.
 * \note Set from the "restrictcid" value read in from chan_dahdi.conf
 */
 unsigned int restrictcid:1;
 /*!
 * \brief TRUE if three way calling is enabled
 * \note Set from the "threewaycalling" value read in from chan_dahdi.conf
 */
 unsigned int threewaycalling:1;
 /*!
 * \brief TRUE if call transfer is enabled
 * \note For FXS ports (either direct analog or over T1/E1):
 * Support flash-hook call transfer
 * \note For digital ports using ISDN PRI protocols:
 * Support switch-side transfer (called 2BCT, RLT or other names)
 * \note Set from the "transfer" value read in from chan_dahdi.conf
 */
 unsigned int transfer:1;
 /*!
 * \brief TRUE if caller ID is used on this channel.
 * \note PRI and SS7 spans will save caller ID from the networking peer.
 * \note FXS ports will generate the caller ID spill.
 * \note FXO ports will listen for the caller ID spill.
 * \note Set from the "usecallerid" value read in from chan_dahdi.conf
 */
 unsigned int use_callerid:1;
 /*!
 * \brief TRUE if we will use the calling presentation setting
 * from the Asterisk channel for outgoing calls.
 * \note Only applies to PRI and SS7 channels.
 * \note Set from the "usecallingpres" value read in from chan_dahdi.conf
 */
 unsigned int use_callingpres:1;
 /*!
 * \brief TRUE if distinctive rings are to be detected.
 * \note For FXO lines
 * \note Set indirectly from the "usedistinctiveringdetection" value read in from chan_dahdi.conf
 */
 unsigned int usedistinctiveringdetection:1;
 /*!
 * \brief TRUE if we should use the callerid from incoming call on dahdi transfer.
 * \note Set from the "useincomingcalleridondahditransfer" value read in from chan_dahdi.conf
 */
 unsigned int dahditrcallerid:1;
 /*!
 * \brief TRUE if allowed to flash-transfer to busy channels.
 * \note Set from the "transfertobusy" value read in from chan_dahdi.conf
 */
 unsigned int transfertobusy:1;
 /*!
 * \brief TRUE if the FXO port monitors for neon type MWI indications from the other end.
 * \note Set if the "mwimonitor" value read in contains "neon" from chan_dahdi.conf
 */
 unsigned int mwimonitor_neon:1;
 /*!
 * \brief TRUE if the FXO port monitors for fsk type MWI indications from the other end.
 * \note Set if the "mwimonitor" value read in contains "fsk" from chan_dahdi.conf
 */
 unsigned int mwimonitor_fsk:1;
 /*!
 * \brief TRUE if the FXO port monitors for rpas precursor to fsk MWI indications from the other end.
 * \note RPAS - Ring Pulse Alert Signal
 * \note Set if the "mwimonitor" value read in contains "rpas" from chan_dahdi.conf
 */
 unsigned int mwimonitor_rpas:1;
 /*! \brief TRUE if an MWI monitor thread is currently active */
 unsigned int mwimonitoractive:1;
 /*! \brief TRUE if a MWI message sending thread is active */
 unsigned int mwisendactive:1;
 /*!
 * \brief TRUE if channel is out of reset and ready
 * \note Used by SS7. Otherwise set but not used.
 */
 unsigned int inservice:1;
 /*!
 * \brief Bitmask for the channel being locally blocked.
 * \note Applies to SS7 and MFCR2 channels.
 * \note For MFCR2 only the first bit is used - TRUE if blocked
 * \note For SS7 two bits are used
 * \note Bit 0 - TRUE if maintenance blocked
 * \note Bit 1 - TRUE if hardware blocked
 */
 unsigned int locallyblocked:2;
 /*!
 * \brief Bitmask for the channel being remotely blocked. 1 maintenance, 2 blocked in hardware.
 * \note Applies to SS7 and MFCR2 channels.
 * \note For MFCR2 only the first bit is used - TRUE if blocked
 * \note For SS7 two bits are used
 * \note Bit 0 - TRUE if maintenance blocked
 * \note Bit 1 - TRUE if hardware blocked
 */
 unsigned int remotelyblocked:2;
 /*!
 * \brief TRUE if the channel alarms will be managed also as Span ones
 * \note Applies to all channels
 */
 unsigned int manages_span_alarms:1;
 /*! \brief TRUE if hardware Rx gain set by Asterisk */
 unsigned int hwrxgain_enabled;
 /*! \brief TRUE if hardware Tx gain set by Asterisk */
 unsigned int hwtxgain_enabled;

#if defined(HAVE_PRI)
 struct sig_pri_span *pri;
 int logicalspan;
#endif /* defined(HAVE_PRI) */
 /*!
 * \brief TRUE if SMDI (Simplified Message Desk Interface) is enabled
 * \note Set from the "usesmdi" value read in from chan_dahdi.conf
 */
 unsigned int use_smdi:1;
 struct mwisend_info mwisend_data;
 /*! \brief The SMDI interface to get SMDI messages from. */
 struct ast_smdi_interface *smdi_iface;

 /*! \brief Distinctive Ring data */
 struct dahdi_distRings drings;

 /*!
 * \brief The configured context for incoming calls.
 * \note The "context" string read in from chan_dahdi.conf
 */
 char context[AST_MAX_CONTEXT];
 /*!
 * \brief A description for the channel configuration
 * \note The "description" string read in from chan_dahdi.conf
 */
 char description[32];
 /*!
 * \brief Default distinctive ring context.
 */
 char defcontext[AST_MAX_CONTEXT];
 /*! \brief Extension to use in the dialplan. */
 char exten[AST_MAX_EXTENSION];
 /*!
 * \brief Language configured for calls.
 * \note The "language" string read in from chan_dahdi.conf
 */
 char language[MAX_LANGUAGE];
 /*!
 * \brief The configured music-on-hold class to use for calls.
 * \note The "musicclass" or "mohinterpret" or "musiconhold" string read in from chan_dahdi.conf
 */
 char mohinterpret[MAX_MUSICCLASS];
 /*!
 * \brief Suggested music-on-hold class for peer channel to use for calls.
 * \note The "mohsuggest" string read in from chan_dahdi.conf
 */
 char mohsuggest[MAX_MUSICCLASS];
 char parkinglot[AST_MAX_EXTENSION]; /*!< Parking lot for this channel */
#if defined(HAVE_PRI) || defined(HAVE_SS7)
 /*! \brief Automatic Number Identification number (Alternate PRI caller ID number) */
 char cid_ani[AST_MAX_EXTENSION];
#endif /* defined(HAVE_PRI) || defined(HAVE_SS7) */
 /*! \brief Automatic Number Identification code from PRI */
 int cid_ani2;
 /*! \brief Caller ID number from an incoming call. */
 char cid_num[AST_MAX_EXTENSION];
 /*!
 * \brief Caller ID tag from incoming call
 * \note the "cid_tag" string read in from chan_dahdi.conf
 */
 char cid_tag[AST_MAX_EXTENSION];
 /*! \brief Caller ID Q.931 TON/NPI field values. Set by PRI. Zero otherwise. */
 int cid_ton;
 /*! \brief Caller ID name from an incoming call. */
 char cid_name[AST_MAX_EXTENSION];
 /*! \brief Caller ID subaddress from an incoming call. */
 char cid_subaddr[AST_MAX_EXTENSION];
 char *origcid_num; /*!< malloced original callerid */
 char *origcid_name; /*!< malloced original callerid */
 /*! \brief Call waiting number. */
 char callwait_num[AST_MAX_EXTENSION];
 /*! \brief Call waiting name. */
 char callwait_name[AST_MAX_EXTENSION];
 /*! \brief Redirecting Directory Number Information Service (RDNIS) number */
 char rdnis[AST_MAX_EXTENSION];
 /*! \brief Dialed Number Identifier */
 char dnid[AST_MAX_EXTENSION];
 /*!
 * \brief Bitmapped groups this belongs to.
 * \note The "group" bitmapped group string read in from chan_dahdi.conf
 */
 ast_group_t group;
 /*! \brief Default call PCM encoding format: DAHDI_LAW_ALAW or DAHDI_LAW_MULAW. */
 int law_default;
 /*! \brief Active PCM encoding format: DAHDI_LAW_ALAW or DAHDI_LAW_MULAW */
 int law;
 int confno; /*!< Our conference */
 int confusers; /*!< Who is using our conference */
 int propconfno; /*!< Propagated conference number */
 /*!
 * \brief Bitmapped call groups this belongs to.
 * \note The "callgroup" bitmapped group string read in from chan_dahdi.conf
 */
 ast_group_t callgroup;
 /*!
 * \brief Bitmapped pickup groups this belongs to.
 * \note The "pickupgroup" bitmapped group string read in from chan_dahdi.conf
 */
 ast_group_t pickupgroup;
 /*!
 * \brief Named call groups this belongs to.
 * \note The "namedcallgroup" string read in from chan_dahdi.conf
 */
 struct ast_namedgroups *named_callgroups;
 /*!
 * \brief Named pickup groups this belongs to.
 * \note The "namedpickupgroup" string read in from chan_dahdi.conf
 */
 struct ast_namedgroups *named_pickupgroups;
 /*!
 * \brief Channel variable list with associated values to set when a channel is created.
 * \note The "setvar" strings read in from chan_dahdi.conf
 */
 struct ast_variable *vars;
 int channel; /*!< Channel Number */
 int span; /*!< Span number */
 time_t guardtime; /*!< Must wait this much time before using for new call */
 int cid_signalling; /*!< CID signalling type bell202 or v23 */
 int cid_start; /*!< CID start indicator, polarity or ring or DTMF without warning event */
 int dtmfcid_holdoff_state; /*!< State indicator that allows for line to settle before checking for dtmf energy */
 struct timeval dtmfcid_delay; /*!< Time value used for allow line to settle */
 int callingpres; /*!< The value of calling presentation that we're going to use when placing a PRI call */
 int callwaitingrepeat; /*!< How many samples to wait before repeating call waiting */
 int cidcwexpire; /*!< When to stop waiting for CID/CW CAS response (In samples) */
 int cid_suppress_expire; /*!< How many samples to suppress after a CID spill. */
 /*! \brief Analog caller ID waveform sample buffer */
 unsigned char *cidspill;
 /*! \brief Position in the cidspill buffer to send out next. */
 int cidpos;
 /*! \brief Length of the cidspill buffer containing samples. */
 int cidlen;
 /*! \brief Ring timeout timer?? */
 int ringt;
 /*!
 * \brief Ring timeout base.
 * \note Value computed indirectly from "ringtimeout" read in from chan_dahdi.conf
 */
 int ringt_base;
 /*!
 * \brief Number of most significant digits/characters to strip from the dialed number.
 * \note Feature is deprecated. Use dialplan logic.
 * \note The characters are stripped before the PRI TON/NPI prefix
 * characters are processed.
 */
 int stripmsd;
 /*!
 * \brief TRUE if Call Waiting (CW) CPE Alert Signal (CAS) is being sent.
 * \note
 * After CAS is sent, the call waiting caller id will be sent if the phone
 * gives a positive reply.
 */
 int callwaitcas;
 /*! \brief Number of call waiting rings. */
 int callwaitrings;
 /*! \brief Echo cancel parameters. */
 struct {
 struct dahdi_echocanparams head;
 struct dahdi_echocanparam params[DAHDI_MAX_ECHOCANPARAMS];
 } echocancel;
 /*!
 * \brief Echo training time. 0 = disabled
 * \note Set from the "echotraining" value read in from chan_dahdi.conf
 */
 int echotraining;
 /*! \brief Filled with 'w'. XXX Purpose?? */
 char echorest[20];
 /*!
 * \brief Number of times to see "busy" tone before hanging up.
 * \note Set from the "busycount" value read in from chan_dahdi.conf
 */
 int busycount;
 /*!
 * \brief Busy cadence pattern description.
 * \note Set from the "busypattern" value read from chan_dahdi.conf
 */
 struct ast_dsp_busy_pattern busy_cadence;
 /*!
 * \brief Bitmapped call progress detection flags. CALLPROGRESS_xxx values.
 * \note Bits set from the "callprogress" and "faxdetect" values read in from chan_dahdi.conf
 */
 int callprogress;
 /*!
 * \brief Number of milliseconds to wait for dialtone.
 * \note Set from the "waitfordialtone" value read in from chan_dahdi.conf
 */
 int waitfordialtone;
 /*!
 * \brief Number of frames to watch for dialtone in incoming calls
 * \note Set from the "dialtone_detect" value read in from chan_dahdi.conf
 */
 int dialtone_detect;
 int dialtone_scanning_time_elapsed; /*!< Amount of audio scanned for dialtone, in frames */
 /*!
 * \brief The number of seconds into call to disable fax detection. (0 = disabled)
 * \note Set from the "faxdetect_timeout" value read in from chan_dahdi.conf
 */
 unsigned int faxdetect_timeout;
 /*!
 * \brief Time (ms) to detect first digit (in an analog phone)
 * \note Set from the "firstdigit_timeout" value read in from chan_dahdi.conf
 */
 int firstdigit_timeout;
 /*!
 * \brief Time (ms) to detect following digits (in an analog phone)
 * \note Set from the "interdigit_timeout" value read in from chan_dahdi.conf
 */
 int interdigit_timeout;
 /*!
 * \brief Time (ms) to wait, in case of ambiguous match (in an analog phone)
 * \note Set from the "matchdigit_timeout" value read in from chan_dahdi.conf
 */
 int matchdigit_timeout;
 struct timeval waitingfordt; /*!< Time we started waiting for dialtone */
 struct timeval flashtime; /*!< Last flash-hook time */
 /*! \brief Opaque DSP configuration structure. */
 struct ast_dsp *dsp;
 /*! \brief DAHDI dial operation command struct for ioctl() call. */
 struct dahdi_dialoperation dop;
 int whichwink; /*!< SIG_FEATDMF_TA Which wink are we on? */
 /*! \brief Second part of SIG_FEATDMF_TA wink operation. */
 char finaldial[64];
 char accountcode[AST_MAX_ACCOUNT_CODE]; /*!< Account code */
 int amaflags; /*!< AMA Flags */
 struct tdd_state *tdd; /*!< TDD flag */
 /*! \brief Accumulated call forwarding number. */
 char call_forward[AST_MAX_EXTENSION];
 /*!
 * \brief Voice mailbox location.
 * \note Set from the "mailbox" string read in from chan_dahdi.conf
 */
 char mailbox[AST_MAX_MAILBOX_UNIQUEID];
 /*! \brief Opaque event subscription parameters for message waiting indication support. */
 struct ast_mwi_subscriber *mwi_event_sub;
 /*! \brief Delayed dialing for E911. Overlap digits for ISDN. */
 char dialdest[256];
#ifdef HAVE_DAHDI_LINEREVERSE_VMWI
 struct dahdi_vmwi_info mwisend_setting; /*!< Which VMWI methods to use */
 unsigned int mwisend_fsk: 1; /*! Variable for enabling FSK MWI handling in chan_dahdi */
 unsigned int mwisend_rpas:1; /*! Variable for enabling Ring Pulse Alert before MWI FSK Spill */
#endif
 int distinctivering; /*!< Which distinctivering to use */
 int dtmfrelax; /*!< whether to run in relaxed DTMF mode */
 /*! \brief Holding place for event injected from outside normal operation. */
 int fake_event;
 /*!
 * \brief Minimal time period (ms) between the answer polarity
 * switch and hangup polarity switch.
 */
 int polarityonanswerdelay;
 /*! \brief Start delay time if polarityonanswerdelay is nonzero. */
 struct timeval polaritydelaytv;
 /*!
 * \brief Send caller ID on FXS after this many rings. Set to 1 for US.
 * \note Set from the "sendcalleridafter" value read in from chan_dahdi.conf
 */
 int sendcalleridafter;
 /*! \brief Current line interface polarity. POLARITY_IDLE, POLARITY_REV */
 int polarity;
 /*! \brief DSP feature flags: DSP_FEATURE_xxx */
 int dsp_features;
#if defined(HAVE_SS7)
 /*! \brief SS7 control parameters */
 struct sig_ss7_linkset *ss7;
#endif /* defined(HAVE_SS7) */
#if defined(HAVE_OPENR2)
 struct dahdi_mfcr2 *mfcr2;
 openr2_chan_t *r2chan;
 openr2_calling_party_category_t mfcr2_recvd_category;
 openr2_calling_party_category_t mfcr2_category;
 int mfcr2_dnis_index;
 int mfcr2_ani_index;
 unsigned int mfcr2call:1;
 unsigned int mfcr2_answer_pending:1;
 unsigned int mfcr2_charge_calls:1;
 unsigned int mfcr2_allow_collect_calls:1;
 unsigned int mfcr2_forced_release:1;
 unsigned int mfcr2_dnis_matched:1;
 unsigned int mfcr2_call_accepted:1;
 unsigned int mfcr2_accept_on_offer:1;
 unsigned int mfcr2_progress_sent:1;
#endif /* defined(HAVE_OPENR2) */
 /*! \brief DTMF digit in progress. 0 when no digit in progress. */
 char begindigit;
 /*! \brief TRUE if confrence is muted. */
 int muting;
 void *sig_pvt;
 struct ast_cc_config_params *cc_params;
 /* DAHDI channel names may differ greatly from the
 * string that was provided to an app such as Dial. We
 * need to save the original string passed to dahdi_request
 * for call completion purposes. This way, we can replicate
 * the original dialed string later.
 */
 char dialstring[AST_CHANNEL_NAME];
};


/* Analog signaling */
#define SIG_EM DAHDI_SIG_EM
#define SIG_EMWINK (0x0100000 | DAHDI_SIG_EM)
#define SIG_FEATD (0x0200000 | DAHDI_SIG_EM)
#define SIG_FEATDMF (0x0400000 | DAHDI_SIG_EM)
#define SIG_FEATB (0x0800000 | DAHDI_SIG_EM)
#define SIG_E911 (0x1000000 | DAHDI_SIG_EM)
#define SIG_FEATDMF_TA (0x2000000 | DAHDI_SIG_EM)
#define SIG_FGC_CAMA (0x4000000 | DAHDI_SIG_EM)
#define SIG_FGC_CAMAMF (0x8000000 | DAHDI_SIG_EM)
#define SIG_FXSLS DAHDI_SIG_FXSLS
#define SIG_FXSGS DAHDI_SIG_FXSGS
#define SIG_FXSKS DAHDI_SIG_FXSKS
#define SIG_FXOLS DAHDI_SIG_FXOLS
#define SIG_FXOGS DAHDI_SIG_FXOGS
#define SIG_FXOKS DAHDI_SIG_FXOKS
#define SIG_SF DAHDI_SIG_SF
#define SIG_SFWINK (0x0100000 | DAHDI_SIG_SF)
#define SIG_SF_FEATD (0x0200000 | DAHDI_SIG_SF)
#define SIG_SF_FEATDMF (0x0400000 | DAHDI_SIG_SF)
#define SIG_SF_FEATB (0x0800000 | DAHDI_SIG_SF)
#define SIG_EM_E1 DAHDI_SIG_EM_E1

/* PRI signaling */
#define SIG_PRI DAHDI_SIG_CLEAR
#define SIG_BRI (0x2000000 | DAHDI_SIG_CLEAR)
#define SIG_BRI_PTMP (0X4000000 | DAHDI_SIG_CLEAR)

/* SS7 signaling */
#define SIG_SS7 (0x1000000 | DAHDI_SIG_CLEAR)

/* MFC/R2 signaling */
#define SIG_MFCR2 DAHDI_SIG_CAS


#define SIG_PRI_LIB_HANDLE_CASES \
 SIG_PRI: \
 case SIG_BRI: \
 case SIG_BRI_PTMP

/*!
 * \internal
 * \brief Determine if sig_pri handles the signaling.
 * \since 1.8
 *
 * \param signaling Signaling to determine if is for sig_pri.
 *
 * \return TRUE if the signaling is for sig_pri.
 */
static inline int dahdi_sig_pri_lib_handles(int signaling)
{
 int handles;

 switch (signaling) {
 case SIG_PRI_LIB_HANDLE_CASES:
 handles = 1;
 break;
 default:
 handles = 0;
 break;
 }

 return handles;
}

static inline int dahdi_analog_lib_handles(int signalling, int radio, int oprmode)
{
 switch (signalling) {
 case SIG_FXOLS:
 case SIG_FXOGS:
 case SIG_FXOKS:
 case SIG_FXSLS:
 case SIG_FXSGS:
 case SIG_FXSKS:
 case SIG_EMWINK:
 case SIG_EM:
 case SIG_EM_E1:
 case SIG_FEATD:
 case SIG_FEATDMF:
 case SIG_E911:
 case SIG_FGC_CAMA:
 case SIG_FGC_CAMAMF:
 case SIG_FEATB:
 case SIG_SFWINK:
 case SIG_SF:
 case SIG_SF_FEATD:
 case SIG_SF_FEATDMF:
 case SIG_FEATDMF_TA:
 case SIG_SF_FEATB:
 break;
 default:
 /* The rest of the function should cover the remainder of signalling types */
 return 0;
 }

 if (radio) {
 return 0;
 }

 if (oprmode) {
 return 0;
 }

 return 1;
}

#define dahdi_get_index(ast, p, nullok) _dahdi_get_index(ast, p, nullok, __PRETTY_FUNCTION__, __LINE__)
int _dahdi_get_index(struct ast_channel *ast, struct dahdi_pvt *p, int nullok, const char *fname, unsigned long line);

void dahdi_dtmf_detect_disable(struct dahdi_pvt *p);
void dahdi_dtmf_detect_enable(struct dahdi_pvt *p);

void dahdi_ec_enable(struct dahdi_pvt *p);
void dahdi_ec_disable(struct dahdi_pvt *p);

void dahdi_conf_update(struct dahdi_pvt *p);
void dahdi_master_slave_link(struct dahdi_pvt *slave, struct dahdi_pvt *master);
void dahdi_master_slave_unlink(struct dahdi_pvt *slave, struct dahdi_pvt *master, int needlock);

/* ------------------------------------------------------------------- */

#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

#endif /* _ASTERISK_CHAN_DAHDI_H */