sig_ss7.h

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2010 Digium, Inc.
 *
 * Richard Mudgett <rmudgett@digium.com>
 *
 * 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 Interface header for SS7 signaling module.
 *
 * \author Matthew Fredrickson <creslin@digium.com>
 * \author Richard Mudgett <rmudgett@digium.com>
 *
 * See Also:
 * \arg \ref AstCREDITS
 */

#ifndef _ASTERISK_SIG_SS7_H
#define _ASTERISK_SIG_SS7_H

#include "asterisk/channel.h"
#include <libss7.h>

#ifdef __cplusplus
extern "C" {
#endif

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

/*! SS7 debug message flags when SS7 debugging is turned on at the command line. */
#define SIG_SS7_DEBUG   \
   (SS7_DEBUG_MTP2 | SS7_DEBUG_MTP3 | SS7_DEBUG_ISUP)

#if 0
/*! SS7 debug message flags set on initial startup. */
#define SIG_SS7_DEBUG_DEFAULT SIG_SS7_DEBUG
#else
/*! SS7 debug message flags set on initial startup. */
#define SIG_SS7_DEBUG_DEFAULT 0
#endif

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

#define SIG_SS7_NUM_DCHANS    4     /*!< No more than 4 d-channels */
#define SIG_SS7_MAX_CHANNELS  672      /*!< No more than a DS3 per trunk group */

#define SIG_SS7      (0x1000000 | DAHDI_SIG_CLEAR)

#define LINKSTATE_INALARM  (1 << 0)
#define LINKSTATE_STARTING (1 << 1)
#define LINKSTATE_UP    (1 << 2)
#define LINKSTATE_DOWN     (1 << 3)

#define SS7_NAI_DYNAMIC    -1

#define LINKSET_FLAG_EXPLICITACM (1 << 0)


enum sig_ss7_tone {
   SIG_SS7_TONE_RINGTONE = 0,
   SIG_SS7_TONE_STUTTER,
   SIG_SS7_TONE_CONGESTION,
   SIG_SS7_TONE_DIALTONE,
   SIG_SS7_TONE_DIALRECALL,
   SIG_SS7_TONE_INFO,
   SIG_SS7_TONE_BUSY,
};

enum sig_ss7_law {
   SIG_SS7_DEFLAW = 0,
   SIG_SS7_ULAW,
   SIG_SS7_ALAW
};

/*! Call establishment life cycle level for simple comparisons. */
enum sig_ss7_call_level {
   /*! Call does not exist. */
   SIG_SS7_CALL_LEVEL_IDLE,
   /*!
    * Call is allocated to the channel.
    * We have not sent or responded to IAM yet.
    */
   SIG_SS7_CALL_LEVEL_ALLOCATED,
   /*!
    * Call is performing continuity check after receiving IAM.
    * We are waiting for COT to proceed further.
    */
   SIG_SS7_CALL_LEVEL_CONTINUITY,
   /*!
    * Call is present.
    * We have not seen a response or sent further call progress to an IAM yet.
    */
   SIG_SS7_CALL_LEVEL_SETUP,
   /*!
    * Call routing is happening.
    * We have sent or received ACM.
    */
   SIG_SS7_CALL_LEVEL_PROCEEDING,
   /*!
    * Called party is being alerted of the call.
    * We have sent or received CPG(ALERTING)/ACM(ALERTING).
    */
   SIG_SS7_CALL_LEVEL_ALERTING,
   /*!
    * Call is connected/answered.
    * We have sent or received CON/ANM.
    */
   SIG_SS7_CALL_LEVEL_CONNECT,
   /*! Call has collided with incoming call. */
   SIG_SS7_CALL_LEVEL_GLARE,
};

struct sig_ss7_linkset;

struct sig_ss7_callback {
   /* Unlock the private in the signaling private structure. */
   void (* const unlock_private)(void *pvt);
   /* Lock the private in the signaling private structure. */
   void (* const lock_private)(void *pvt);
   /* Do deadlock avoidance for the private signaling structure lock.  */
   void (* const deadlock_avoidance_private)(void *pvt);

   int (* const set_echocanceller)(void *pvt, int enable);
   void (* const set_loopback)(void *pvt, int enable);

   struct ast_channel * (* const new_ast_channel)(void *pvt, int state, enum sig_ss7_law law, char *exten, const struct ast_channel *requestor);
   int (* const play_tone)(void *pvt, enum sig_ss7_tone tone);

   void (* const handle_link_exception)(struct sig_ss7_linkset *linkset, int which);
   void (* const set_alarm)(void *pvt, int in_alarm);
   void (* const set_dialing)(void *pvt, int is_dialing);
   void (* const set_digital)(void *pvt, int is_digital);
   void (* const set_outgoing)(void *pvt, int is_outgoing);
   void (* const set_inservice)(void *pvt, int is_inservice);
   void (* const set_locallyblocked)(void *pvt, int is_blocked);
   void (* const set_remotelyblocked)(void *pvt, int is_blocked);
   void (* const set_callerid)(void *pvt, const struct ast_party_caller *caller);
   void (* const set_dnid)(void *pvt, const char *dnid);

   void (* const queue_control)(void *pvt, int subclass);
   void (* const open_media)(void *pvt);
};

/*! Global sig_ss7 callbacks to the upper layer. */
extern struct sig_ss7_callback sig_ss7_callbacks;

struct sig_ss7_chan {
   void *chan_pvt;               /*!< Private structure of the user of this module. */
   struct sig_ss7_linkset *ss7;
   struct ast_channel *owner;

   /*! \brief Opaque libss7 call control structure */
   struct isup_call *ss7call;

   /*! Call establishment life cycle level for simple comparisons. */
   enum sig_ss7_call_level call_level;

   int channel;               /*!< Channel Number */
   int cic;                /*!< CIC associated with channel */
   unsigned int dpc;          /*!< CIC's DPC */

   /* Options to be set by user */
   /*!
    * \brief Number of most significant digits/characters to strip from the dialed number.
    * \note Feature is deprecated.  Use dialplan logic.
    */
   int stripmsd;
   /*!
    * \brief TRUE if the outgoing caller ID is blocked/hidden.
    */
   unsigned int hidecallerid:1;
   /*! \brief TRUE if caller ID is used on this channel. */
   unsigned int use_callerid:1;
   /*!
    * \brief TRUE if we will use the calling presentation setting
    * from the Asterisk channel for outgoing calls.
    */
   unsigned int use_callingpres:1;
   unsigned int immediate:1;     /*!< Answer before getting digits? */

   /*! \brief TRUE if the channel is locally blocked.  Set by user and link. */
   unsigned int locallyblocked:1;
   /*! \brief TRUE if the channel is remotely blocked.  Set by user and link. */
   unsigned int remotelyblocked:1;

   char context[AST_MAX_CONTEXT];
   char mohinterpret[MAX_MUSICCLASS];

   /* Options to be checked by user */
   int cid_ani2;              /*!< Automatic Number Identification number (Alternate PRI caller ID number) */
   int cid_ton;               /*!< Type Of Number (TON) */
   int callingpres;           /*!< The value of calling presentation that we're going to use when placing a PRI call */
   char cid_num[AST_MAX_EXTENSION];
   char cid_subaddr[AST_MAX_EXTENSION];/*!< XXX SS7 may not support. */
   char cid_name[AST_MAX_EXTENSION];
   char cid_ani[AST_MAX_EXTENSION];
   char exten[AST_MAX_EXTENSION];

   /* Options to be checked by user that are stuffed into channel variables. */
   char charge_number[50];
   char gen_add_number[50];
   char gen_dig_number[50];
   char orig_called_num[50];
   char redirecting_num[50];
   char generic_name[50];
   unsigned char gen_add_num_plan;
   unsigned char gen_add_nai;
   unsigned char gen_add_pres_ind;
   unsigned char gen_add_type;
   unsigned char gen_dig_type;
   unsigned char gen_dig_scheme;
   char jip_number[50];
#if 0
   unsigned char lspi_type;
   unsigned char lspi_scheme;
   unsigned char lspi_context;
#endif
   char lspi_ident[50];
   unsigned int call_ref_ident;
   unsigned int call_ref_pc;
   unsigned char calling_party_cat;

   /*
    * Channel status bits.
    */
   /*! TRUE if channel is associated with a link that is down. */
   unsigned int inalarm:1;
   /*! TRUE if this channel is being used for an outgoing call. */
   unsigned int outgoing:1;
   /*! \brief TRUE if the call has seen inband-information progress through the network. */
   unsigned int progress:1;
   /*! \brief TRUE if the call has already gone/hungup */
   unsigned int alreadyhungup:1;
   /*! \brief XXX BOOLEAN Purpose??? */
   unsigned int rlt:1;
   /*! TRUE if this channel is in loopback. */
   unsigned int loopedback:1;
};

struct sig_ss7_linkset {
   pthread_t master;             /*!< Thread of master */
   ast_mutex_t lock;             /*!< libss7 access lock */
   struct ss7 *ss7;
   struct sig_ss7_chan *pvts[SIG_SS7_MAX_CHANNELS];/*!< Member channel pvt structs */
   int fds[SIG_SS7_NUM_DCHANS];
   int numsigchans;
   int linkstate[SIG_SS7_NUM_DCHANS];
   int numchans;
   int span;                     /*!< span number put into user output messages */
   int debug;                    /*!< set to true if to dump SS7 event info */
   enum {
      LINKSET_STATE_DOWN = 0,
      LINKSET_STATE_UP
   } state;

   /* Options to be set by user */
   int flags;                    /*!< Linkset flags (LINKSET_FLAG_EXPLICITACM) */
   int type;                     /*!< SS7 type ITU/ANSI. Used for companding selection. */
   char called_nai;              /*!< Called Nature of Address Indicator */
   char calling_nai;             /*!< Calling Nature of Address Indicator */
   char internationalprefix[10];    /*!< country access code ('00' for european dialplans) */
   char nationalprefix[10];         /*!< area access code ('0' for european dialplans) */
   char subscriberprefix[20];       /*!< area access code + area code ('0'+area code for european dialplans) */
   char unknownprefix[20];          /*!< for unknown dialplans */
};

void sig_ss7_set_alarm(struct sig_ss7_chan *p, int in_alarm);

void *ss7_linkset(void *data);

void sig_ss7_link_alarm(struct sig_ss7_linkset *linkset, int which);
void sig_ss7_link_noalarm(struct sig_ss7_linkset *linkset, int which);
int sig_ss7_add_sigchan(struct sig_ss7_linkset *linkset, int which, int ss7type, int transport, int inalarm, int networkindicator, int pointcode, int adjpointcode);

int sig_ss7_available(struct sig_ss7_chan *p);
int sig_ss7_call(struct sig_ss7_chan *p, struct ast_channel *ast, const char *rdest);
int sig_ss7_hangup(struct sig_ss7_chan *p, struct ast_channel *ast);
int sig_ss7_answer(struct sig_ss7_chan *p, struct ast_channel *ast);
void sig_ss7_fixup(struct ast_channel *oldchan, struct ast_channel *newchan, struct sig_ss7_chan *pchan);
int sig_ss7_indicate(struct sig_ss7_chan *p, struct ast_channel *chan, int condition, const void *data, size_t datalen);
struct ast_channel *sig_ss7_request(struct sig_ss7_chan *p, enum sig_ss7_law law, const struct ast_channel *requestor, int transfercapability);
void sig_ss7_chan_delete(struct sig_ss7_chan *doomed);
struct sig_ss7_chan *sig_ss7_chan_new(void *pvt_data, struct sig_ss7_linkset *ss7);
void sig_ss7_init_linkset(struct sig_ss7_linkset *ss7);

void sig_ss7_cli_show_channels_header(int fd);
void sig_ss7_cli_show_channels(int fd, struct sig_ss7_linkset *linkset);


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

#ifdef __cplusplus
}
#endif

#endif   /* _ASTERISK_SIG_SS7_H */
/* ------------------------------------------------------------------- */
/* end sig_ss7.h */