Small simplification
[asterisk/asterisk.git] / channels / chan_zap.c
1 /*
2  * Asterisk -- A telephony toolkit for Linux.
3  *
4  * Zaptel Pseudo TDM interface 
5  * 
6  * Copyright (C) 2003 Digium
7  *
8  * Mark Spencer <markster@digium.com>
9  *
10  * This program is free software, distributed under the terms of
11  * the GNU General Public License
12  */
13
14 #include <stdio.h>
15 #include <string.h>
16 #include <asterisk/lock.h>
17 #include <asterisk/channel.h>
18 #include <asterisk/channel_pvt.h>
19 #include <asterisk/config.h>
20 #include <asterisk/logger.h>
21 #include <asterisk/module.h>
22 #include <asterisk/pbx.h>
23 #include <asterisk/options.h>
24 #include <asterisk/file.h>
25 #include <asterisk/ulaw.h>
26 #include <asterisk/alaw.h>
27 #include <asterisk/callerid.h>
28 #include <asterisk/adsi.h>
29 #include <asterisk/cli.h>
30 #include <asterisk/cdr.h>
31 #include <asterisk/parking.h>
32 #include <asterisk/musiconhold.h>
33 #include <asterisk/say.h>
34 #include <asterisk/tdd.h>
35 #include <asterisk/app.h>
36 #include <asterisk/dsp.h>
37 #include <asterisk/astdb.h>
38 #include <asterisk/manager.h>
39 #include <asterisk/causes.h>
40 #include <asterisk/term.h>
41 #include <asterisk/utils.h>
42 #include <sys/signal.h>
43 #include <errno.h>
44 #include <stdlib.h>
45 #include <stdint.h>
46 #include <unistd.h>
47 #include <sys/ioctl.h>
48 #ifdef __linux__
49 #include <linux/zaptel.h>
50 #else
51 #include <zaptel.h>
52 #endif /* __linux__ */
53 #include <math.h>
54 #include <tonezone.h>
55 #include <ctype.h>
56 #ifdef ZAPATA_PRI
57 #include <libpri.h>
58 #ifndef PRI_SETUP_CALL
59 #error "You need newer libpri"
60 #endif
61 #endif
62 #ifdef ZAPATA_R2
63 #include <libmfcr2.h>
64 #endif
65
66 #include "../asterisk.h"
67
68 #ifndef ZT_SIG_EM_E1
69 #error "Your zaptel is too old.  please cvs update"
70 #endif
71
72 /*
73  * Define ZHONE_HACK to cause us to go off hook and then back on hook when
74  * the user hangs up to reset the state machine so ring works properly.
75  * This is used to be able to support kewlstart by putting the zhone in
76  * groundstart mode since their forward disconnect supervision is entirely
77  * broken even though their documentation says it isn't and their support
78  * is entirely unwilling to provide any assistance with their channel banks
79  * even though their web site says they support their products for life.
80  */
81
82 /* #define ZHONE_HACK */
83
84 /* Typically, how many rings before we should send Caller*ID */
85 #define DEFAULT_CIDRINGS 1
86
87 #define CHANNEL_PSEUDO -12
88
89 #define AST_LAW(p) (((p)->law == ZT_LAW_ALAW) ? AST_FORMAT_ALAW : AST_FORMAT_ULAW)
90
91 static char *desc = "Zapata Telephony"
92 #ifdef ZAPATA_PRI
93                " w/PRI"
94 #endif
95 #ifdef ZAPATA_R2
96                " w/R2"
97 #endif
98 ;
99
100 static char *tdesc = "Zapata Telephony Driver"
101 #ifdef ZAPATA_PRI
102                " w/PRI"
103 #endif
104 #ifdef ZAPATA_R2
105                " w/R2"
106 #endif
107 ;
108
109 static char *type = "Zap";
110 static char *typecompat = "Tor";        /* Retain compatibility with chan_tor */
111 static char *config = "zapata.conf";
112
113 #define SIG_EM          ZT_SIG_EM
114 #define SIG_EMWINK      (0x100000 | ZT_SIG_EM)
115 #define SIG_FEATD       (0x200000 | ZT_SIG_EM)
116 #define SIG_FEATDMF     (0x400000 | ZT_SIG_EM)
117 #define SIG_FEATB       (0x800000 | ZT_SIG_EM)
118 #define SIG_E911        (0x1000000 | ZT_SIG_EM)
119 #define SIG_FXSLS       ZT_SIG_FXSLS
120 #define SIG_FXSGS       ZT_SIG_FXSGS
121 #define SIG_FXSKS       ZT_SIG_FXSKS
122 #define SIG_FXOLS       ZT_SIG_FXOLS
123 #define SIG_FXOGS       ZT_SIG_FXOGS
124 #define SIG_FXOKS       ZT_SIG_FXOKS
125 #define SIG_PRI         ZT_SIG_CLEAR
126 #define SIG_R2          ZT_SIG_CAS
127 #define SIG_SF          ZT_SIG_SF
128 #define SIG_SFWINK      (0x100000 | ZT_SIG_SF)
129 #define SIG_SF_FEATD    (0x200000 | ZT_SIG_SF)
130 #define SIG_SF_FEATDMF  (0x400000 | ZT_SIG_SF)
131 #define SIG_SF_FEATB    (0x800000 | ZT_SIG_SF)
132 #define SIG_EM_E1       ZT_SIG_EM_E1
133 #define SIG_GR303FXOKS   (0x100000 | ZT_SIG_FXOKS)
134
135 #define NUM_SPANS       32
136 #define NUM_DCHANS      4               /* No more than 4 d-channels */
137 #define MAX_CHANNELS    672     /* No more than a DS3 per trunk group */
138 #define RESET_INTERVAL  3600    /* How often (in seconds) to reset unused channels */
139
140 #define CHAN_PSEUDO     -2
141
142 #define DCHAN_PROVISIONED (1 << 0)
143 #define DCHAN_NOTINALARM  (1 << 1)
144 #define DCHAN_UP          (1 << 2)
145
146 #define DCHAN_AVAILABLE (DCHAN_PROVISIONED | DCHAN_NOTINALARM | DCHAN_UP)
147
148 static char context[AST_MAX_EXTENSION] = "default";
149 static char callerid[256] = "";
150
151 static char language[MAX_LANGUAGE] = "";
152 static char musicclass[MAX_LANGUAGE] = "";
153 static char progzone[10]= "";
154
155 static int usedistinctiveringdetection = 0;
156
157 static int use_callerid = 1;
158 static int zaptrcallerid = 0;
159 static int cur_signalling = -1;
160
161 static unsigned int cur_group = 0;
162 static unsigned int cur_callergroup = 0;
163 static unsigned int cur_pickupgroup = 0;
164 static int relaxdtmf = 0;
165
166 static int immediate = 0;
167
168 static int stripmsd = 0;
169
170 static int callwaiting = 0;
171
172 static int callwaitingcallerid = 0;
173
174 static int hidecallerid = 0;
175
176 static int restrictcid = 0;
177
178 static int use_callingpres = 0;
179
180 static int callreturn = 0;
181
182 static int threewaycalling = 0;
183
184 static int transfer = 0;
185
186 static int cancallforward = 0;
187
188 static float rxgain = 0.0;
189
190 static float txgain = 0.0;
191
192 static int tonezone = -1;
193
194 static int echocancel;
195
196 static int echotraining;
197
198 static int echocanbridged = 0;
199
200 static int busydetect = 0;
201
202 static int busycount = 3;
203
204 static int callprogress = 0;
205
206 static char accountcode[20] = "";
207
208 static char mailbox[AST_MAX_EXTENSION];
209
210 static int amaflags = 0;
211
212 static int adsi = 0;
213
214 static int numbufs = 4;
215
216 static int cur_prewink = -1;
217 static int cur_preflash = -1;
218 static int cur_wink = -1;
219 static int cur_flash = -1;
220 static int cur_start = -1;
221 static int cur_rxwink = -1;
222 static int cur_rxflash = -1;
223 static int cur_debounce = -1;
224
225 #ifdef ZAPATA_PRI
226 static int minunused = 2;
227 static int minidle = 0;
228 static char idleext[AST_MAX_EXTENSION];
229 static char idledial[AST_MAX_EXTENSION];
230 static int overlapdial = 0;
231 static struct ast_channel inuse = { "GR-303InUse" };
232 #endif
233
234 /* Wait up to 16 seconds for first digit (FXO logic) */
235 static int firstdigittimeout = 16000;
236
237 /* How long to wait for following digits (FXO logic) */
238 static int gendigittimeout = 8000;
239
240 /* How long to wait for an extra digit, if there is an ambiguous match */
241 static int matchdigittimeout = 3000;
242
243 static int usecnt =0;
244 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
245
246 /* Protect the interface list (of zt_pvt's) */
247 AST_MUTEX_DEFINE_STATIC(iflock);
248
249 static int ifcount = 0;
250
251 /* Protect the monitoring thread, so only one process can kill or start it, and not
252    when it's doing something critical. */
253 AST_MUTEX_DEFINE_STATIC(monlock);
254
255 /* This is the thread for the monitor which checks for input on the channels
256    which are not currently in use.  */
257 static pthread_t monitor_thread = AST_PTHREADT_NULL;
258
259 static int restart_monitor(void);
260
261 static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc);
262
263 static int zt_sendtext(struct ast_channel *c, char *text);
264
265 static inline int zt_get_event(int fd)
266 {
267         /* Avoid the silly zt_getevent which ignores a bunch of events */
268         int j;
269         if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
270         return j;
271 }
272
273 static inline int zt_wait_event(int fd)
274 {
275         /* Avoid the silly zt_waitevent which ignores a bunch of events */
276         int i,j=0;
277         i = ZT_IOMUX_SIGEVENT;
278         if (ioctl(fd, ZT_IOMUX, &i) == -1) return -1;
279         if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
280         return j;
281 }
282
283 /* Chunk size to read -- we use 20ms chunks to make things happy.  */   
284 #define READ_SIZE 160
285
286 #define MASK_AVAIL              (1 << 0)                /* Channel available for PRI use */
287 #define MASK_INUSE              (1 << 1)                /* Channel currently in use */
288
289 #define CALLWAITING_SILENT_SAMPLES      ( (300 * 8) / READ_SIZE) /* 300 ms */
290 #define CALLWAITING_REPEAT_SAMPLES      ( (10000 * 8) / READ_SIZE) /* 300 ms */
291 #define CIDCW_EXPIRE_SAMPLES            ( (500 * 8) / READ_SIZE) /* 500 ms */
292 #define MIN_MS_SINCE_FLASH                      ( (2000) )      /* 2000 ms */
293 #define RINGT                                           ( (8000 * 8) / READ_SIZE)
294
295 struct zt_pvt;
296
297
298 #ifdef ZAPATA_R2
299 static int r2prot = -1;
300 #endif
301
302
303 #ifdef ZAPATA_PRI
304
305 #define PVT_TO_CHANNEL(p) (((p)->prioffset) | ((p)->logicalspan << 8))
306 #define PRI_CHANNEL(p) ((p) & 0xff)
307 #define PRI_SPAN(p) (((p) >> 8) & 0xff)
308
309 struct zt_pri {
310         pthread_t master;                       /* Thread of master */
311         ast_mutex_t lock;               /* Mutex */
312         char idleext[AST_MAX_EXTENSION];                /* Where to idle extra calls */
313         char idlecontext[AST_MAX_EXTENSION];            /* What context to use for idle */
314         char idledial[AST_MAX_EXTENSION];               /* What to dial before dumping */
315         int minunused;                          /* Min # of channels to keep empty */
316         int minidle;                            /* Min # of "idling" calls to keep active */
317         int nodetype;                           /* Node type */
318         int switchtype;                         /* Type of switch to emulate */
319         int dialplan;                   /* Dialing plan */
320         int dchannels[NUM_DCHANS];      /* What channel are the dchannels on */
321         int trunkgroup;                 /* What our trunkgroup is */
322         int mastertrunkgroup;   /* What trunk group is our master */
323         int prilogicalspan;             /* Logical span number within trunk group */
324         int numchans;                   /* Num of channels we represent */
325         int overlapdial;                /* In overlap dialing mode */
326         struct pri *dchans[NUM_DCHANS]; /* Actual d-channels */
327         int dchanavail[NUM_DCHANS];             /* Whether each channel is available */
328         struct pri *pri;                                /* Currently active D-channel */
329         int debug;
330         int fds[NUM_DCHANS];    /* FD's for d-channels */
331         int offset;
332         int span;
333         int resetting;
334         int resetpos;
335         time_t lastreset;
336         struct zt_pvt *pvts[MAX_CHANNELS];      /* Member channel pvt structs */
337         struct zt_pvt *crvs;                            /* Member CRV structs */
338         struct zt_pvt *crvend;                          /* Pointer to end of CRV structs */
339 };
340
341
342 static struct zt_pri pris[NUM_SPANS];
343
344 static int pritype = PRI_CPE;
345
346 #if 0
347 #define DEFAULT_PRI_DEBUG (PRI_DEBUG_Q931_DUMP | PRI_DEBUG_Q921_DUMP | PRI_DEBUG_Q921_RAW | PRI_DEBUG_Q921_STATE)
348 #else
349 #define DEFAULT_PRI_DEBUG 0
350 #endif
351
352 static inline void pri_rel(struct zt_pri *pri)
353 {
354         ast_mutex_unlock(&pri->lock);
355 }
356
357 static int switchtype = PRI_SWITCH_NI2;
358 static int dialplan = PRI_NATIONAL_ISDN + 1;
359
360 #else
361 /* Shut up the compiler */
362 struct zt_pri;
363 #endif
364
365 #define SUB_REAL                0                       /* Active call */
366 #define SUB_CALLWAIT    1                       /* Call-Waiting call on hold */
367 #define SUB_THREEWAY    2                       /* Three-way call */
368
369
370 static struct zt_distRings drings;
371
372 struct distRingData {
373         int ring[3];
374 };
375 struct ringContextData {
376         char contextData[AST_MAX_EXTENSION];
377 };
378 struct zt_distRings {
379         struct distRingData ringnum[3];
380         struct ringContextData ringContext[3];
381 };
382
383 static char *subnames[] = {
384         "Real",
385         "Callwait",
386         "Threeway"
387 };
388
389 struct zt_subchannel {
390         int zfd;
391         struct ast_channel *owner;
392         int chan;
393         short buffer[AST_FRIENDLY_OFFSET/2 + READ_SIZE];
394         struct ast_frame f;             /* One frame for each channel.  How did this ever work before? */
395         int needringing;
396         int needbusy;
397         int needcongestion;
398         int needcallerid;
399         int needanswer;
400         int linear;
401         int inthreeway;
402         ZT_CONFINFO curconf;
403 };
404
405 #define CONF_USER_REAL          (1 << 0)
406 #define CONF_USER_THIRDCALL     (1 << 1)
407
408 #define MAX_SLAVES      4
409
410 static struct zt_pvt {
411         ast_mutex_t lock;
412         struct ast_channel *owner;      /* Our current active owner (if applicable) */
413                 /* Up to three channels can be associated with this call */
414                 
415         struct zt_subchannel sub_unused;        /* Just a safety precaution */
416         struct zt_subchannel subs[3];   /* Sub-channels */
417         struct zt_confinfo saveconf;    /* Saved conference info */
418
419         struct zt_pvt *slaves[MAX_SLAVES];      /* Slave to us (follows our conferencing) */
420         struct zt_pvt *master;  /* Master to us (we follow their conferencing) */
421         int inconference;               /* If our real should be in the conference */
422         
423         int sig;                                        /* Signalling style */
424         int radio;                              /* radio type */
425         int firstradio;                         /* first radio flag */
426         float rxgain;
427         float txgain;
428         int tonezone;                           /* tone zone for this chan, or -1 for default */
429         struct zt_pvt *next;                    /* Next channel in list */
430         struct zt_pvt *prev;                    /* Prev channel in list */
431
432         struct zt_distRings drings;
433         int usedistinctiveringdetection;
434
435         char context[AST_MAX_EXTENSION];
436         char defcontext[AST_MAX_EXTENSION];
437         char exten[AST_MAX_EXTENSION];
438         char language[MAX_LANGUAGE];
439         char musicclass[MAX_LANGUAGE];
440         char callerid[AST_MAX_EXTENSION];
441         char lastcallerid[AST_MAX_EXTENSION];
442         char *origcallerid;                     /* malloced original callerid */
443         char callwaitcid[AST_MAX_EXTENSION];
444         char rdnis[AST_MAX_EXTENSION];
445         char dnid[AST_MAX_EXTENSION];
446         unsigned int group;
447         int law;
448         int confno;                                     /* Our conference */
449         int confusers;                          /* Who is using our conference */
450         int propconfno;                         /* Propagated conference number */
451         unsigned int callgroup;
452         unsigned int pickupgroup;
453         int immediate;                          /* Answer before getting digits? */
454         int channel;                            /* Channel Number or CRV */
455         int span;                                       /* Span number */
456         int dialing;
457         time_t guardtime;                       /* Must wait this much time before using for new call */
458         int dialednone;
459         int use_callerid;                       /* Whether or not to use caller id on this channel */
460         int hidecallerid;
461         int callreturn;
462         int permhidecallerid;           /* Whether to hide our outgoing caller ID or not */
463         int restrictcid;                /* Whether restrict the callerid -> only send ANI */
464         int use_callingpres;            /* Whether to use the callingpres the calling switch sends */
465         int callingpres;                /* The value of callling presentation that we're going to use when placing a PRI call */
466         int callwaitingrepeat;          /* How many samples to wait before repeating call waiting */
467         int cidcwexpire;                        /* When to expire our muting for CID/CW */
468         unsigned char *cidspill;
469         int cidpos;
470         int cidlen;
471         int ringt;
472         int stripmsd;
473         int callwaiting;
474         int callwaitcas;
475         int callwaitrings;
476         int echocancel;
477         int echotraining;
478         int echocanbridged;
479         int echocanon;
480         int echobreak;
481         char echorest[10];
482         int permcallwaiting;
483         int callwaitingcallerid;
484         int threewaycalling;
485         int transfer;
486         int digital;
487         int outgoing;
488         int dnd;
489         int busydetect;
490         int busycount;
491         int callprogress;
492         struct timeval flashtime;       /* Last flash-hook time */
493         struct ast_dsp *dsp;
494         int cref;                                       /* Call reference number */
495         ZT_DIAL_OPERATION dop;
496         int destroy;
497         int ignoredtmf;                         
498         int inalarm;
499         char accountcode[20];           /* Account code */
500         int amaflags;                           /* AMA Flags */
501         char didtdd;                    /* flag to say its done it once */
502         struct tdd_state *tdd;          /* TDD flag */
503         int adsi;
504         int cancallforward;
505         char call_forward[AST_MAX_EXTENSION];
506         char mailbox[AST_MAX_EXTENSION];
507         char dialdest[256];
508         int onhooktime;
509         int msgstate;
510         
511         int confirmanswer;              /* Wait for '#' to confirm answer */
512         int distinctivering;    /* Which distinctivering to use */
513         int cidrings;                   /* Which ring to deliver CID on */
514         
515         int faxhandled;                 /* Has a fax tone already been handled? */
516         
517         char mate;                      /* flag to say its in MATE mode */
518         int pulsedial;          /* whether a pulse dial phone is detected */
519         int dtmfrelax;          /* whether to run in relaxed DTMF mode */
520         int fake_event;
521         int zaptrcallerid;      /* should we use the callerid from incoming call on zap transfer or not */
522 #ifdef ZAPATA_PRI
523         struct zt_pri *pri;
524         struct zt_pvt *bearer;
525         struct zt_pvt *realcall;
526         q931_call *call;
527         int isidlecall;
528         int resetting;
529         int prioffset;
530         int logicalspan;
531         int alreadyhungup;
532         int proceeding;
533         int setup_ack;          /* wheter we received SETUP_ACKNOWLEDGE or not */
534 #endif  
535 #ifdef ZAPATA_R2
536         int r2prot;
537         mfcr2_t *r2;
538         int hasr2call;
539         int r2blocked;
540         int sigchecked;
541 #endif  
542 } *iflist = NULL, *ifend = NULL;
543
544 struct zt_pvt *round_robin[32];
545
546 #ifdef ZAPATA_PRI
547 static inline int pri_grab(struct zt_pvt *pvt, struct zt_pri *pri)
548 {
549         int res;
550         /* Grab the lock first */
551         do {
552             res = ast_mutex_trylock(&pri->lock);
553                 if (res) {
554                         ast_mutex_unlock(&pvt->lock);
555                         /* Release the lock and try again */
556                         usleep(1);
557                         ast_mutex_lock(&pvt->lock);
558                 }
559         } while(res);
560         /* Then break the poll */
561         pthread_kill(pri->master, SIGURG);
562         return 0;
563 }
564 #endif
565
566 #define NUM_CADENCE_MAX 25
567 static int num_cadence = 4;
568 static int user_has_defined_cadences = 0;
569
570 static struct zt_ring_cadence cadences[NUM_CADENCE_MAX] = {
571         { { 125, 125, 2000, 4000 } },                   /* Quick chirp followed by normal ring */
572         { { 250, 250, 500, 1000, 250, 250, 500, 4000 } }, /* British style ring */
573         { { 125, 125, 125, 125, 125, 4000 } },  /* Three short bursts */
574         { { 1000, 500, 2500, 5000 } },  /* Long ring */
575 };
576
577 int receivedRingT; /* Used to find out what ringtone we are on */
578
579 /* cidrings says in which pause to transmit the cid information, where the first pause
580  * is 1, the second pause is 2 and so on.
581  */
582
583 static int cidrings[NUM_CADENCE_MAX] = {
584         2,                                                                              /* Right after first long ring */
585         4,                                                                              /* Right after long part */
586         3,                                                                              /* After third chirp */
587         2,                                                                              /* Second spell */
588 };
589
590 #define ISTRUNK(p) ((p->sig == SIG_FXSLS) || (p->sig == SIG_FXSKS) || \
591                         (p->sig == SIG_FXSGS) || (p->sig == SIG_PRI))
592
593 #define CANBUSYDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
594 #define CANPROGRESSDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
595
596 #ifdef ZAPATA_PRI
597 /* translate between PRI causes and asterisk's */
598 static int hangup_pri2cause(int cause)
599 {
600         switch(cause) {
601                 case PRI_CAUSE_USER_BUSY:
602                         return AST_CAUSE_BUSY;
603                 case PRI_CAUSE_NORMAL_CLEARING:
604                         return AST_CAUSE_NORMAL;
605                 case PRI_CAUSE_NORMAL_CIRCUIT_CONGESTION:
606                 case PRI_CAUSE_REQUESTED_CHAN_UNAVAIL:
607                         return AST_CAUSE_CONGESTION;
608                 case PRI_CAUSE_UNALLOCATED:
609                 case PRI_CAUSE_NUMBER_CHANGED:
610                         return AST_CAUSE_UNALLOCATED;
611                 default:
612                         return AST_CAUSE_FAILURE;
613         }
614         /* never reached */
615         return 0;
616 }
617
618 /* translate between ast cause and PRI */
619 static int hangup_cause2pri(int cause)
620 {
621         switch(cause) {
622                 case AST_CAUSE_BUSY:
623                         return PRI_CAUSE_USER_BUSY;
624                 case AST_CAUSE_UNALLOCATED:
625                         return PRI_CAUSE_UNALLOCATED;
626                 case AST_CAUSE_CONGESTION:
627                         return PRI_CAUSE_NORMAL_CIRCUIT_CONGESTION;
628                 case AST_CAUSE_NORMAL:
629                 default:
630                         return PRI_CAUSE_NORMAL_CLEARING;
631         }
632         /* never reached */
633         return 0;
634 }
635 #endif
636
637 static int zt_get_index(struct ast_channel *ast, struct zt_pvt *p, int nullok)
638 {
639         int res;
640         if (p->subs[0].owner == ast)
641                 res = 0;
642         else if (p->subs[1].owner == ast)
643                 res = 1;
644         else if (p->subs[2].owner == ast)
645                 res = 2;
646         else {
647                 res = -1;
648                 if (!nullok)
649                         ast_log(LOG_WARNING, "Unable to get index, and nullok is not asserted\n");
650         }
651         return res;
652 }
653
654 static void wakeup_sub(struct zt_pvt *p, int a)
655 {
656         struct ast_frame null = { AST_FRAME_NULL, };
657         for (;;) {
658                 if (p->subs[a].owner) {
659                         if (ast_mutex_trylock(&p->subs[a].owner->lock)) {
660                                 ast_mutex_unlock(&p->lock);
661                                 usleep(1);
662                                 ast_mutex_lock(&p->lock);
663                         } else {
664                                 ast_queue_frame(p->subs[a].owner, &null);
665                                 ast_mutex_unlock(&p->subs[a].owner->lock);
666                                 break;
667                         }
668                 } else
669                         break;
670         }
671 }
672
673 static void zap_queue_frame(struct zt_pvt *p, struct ast_frame *f)
674 {
675         for (;;) {
676                 if (p->owner) {
677                         if (ast_mutex_trylock(&p->owner->lock)) {
678                                 ast_mutex_unlock(&p->lock);
679                                 usleep(1);
680                                 ast_mutex_lock(&p->lock);
681                         } else {
682                                 ast_queue_frame(p->owner, f);
683                                 ast_mutex_unlock(&p->owner->lock);
684                                 break;
685                         }
686                 } else
687                         break;
688         }
689 }
690
691 static void swap_subs(struct zt_pvt *p, int a, int b)
692 {
693         int tchan;
694         int tinthreeway;
695         struct ast_channel *towner;
696
697         ast_log(LOG_DEBUG, "Swapping %d and %d\n", a, b);
698
699         tchan = p->subs[a].chan;
700         towner = p->subs[a].owner;
701         tinthreeway = p->subs[a].inthreeway;
702
703         p->subs[a].chan = p->subs[b].chan;
704         p->subs[a].owner = p->subs[b].owner;
705         p->subs[a].inthreeway = p->subs[b].inthreeway;
706
707         p->subs[b].chan = tchan;
708         p->subs[b].owner = towner;
709         p->subs[b].inthreeway = tinthreeway;
710
711         if (p->subs[a].owner) 
712                 p->subs[a].owner->fds[0] = p->subs[a].zfd;
713         if (p->subs[b].owner) 
714                 p->subs[b].owner->fds[0] = p->subs[b].zfd;
715         wakeup_sub(p, a);
716         wakeup_sub(p, b);
717 }
718
719 static int zt_open(char *fn)
720 {
721         int fd;
722         int isnum;
723         int chan = 0;
724         int bs;
725         int x;
726         isnum = 1;
727         for (x=0;x<strlen(fn);x++) {
728                 if (!isdigit(fn[x])) {
729                         isnum = 0;
730                         break;
731                 }
732         }
733         if (isnum) {
734                 chan = atoi(fn);
735                 if (chan < 1) {
736                         ast_log(LOG_WARNING, "Invalid channel number '%s'\n", fn);
737                         return -1;
738                 }
739                 fn = "/dev/zap/channel";
740         }
741         fd = open(fn, O_RDWR | O_NONBLOCK);
742         if (fd < 0) {
743                 ast_log(LOG_WARNING, "Unable to open '%s': %s\n", fn, strerror(errno));
744                 return -1;
745         }
746         if (chan) {
747                 if (ioctl(fd, ZT_SPECIFY, &chan)) {
748                         x = errno;
749                         close(fd);
750                         errno = x;
751                         ast_log(LOG_WARNING, "Unable to specify channel %d: %s\n", chan, strerror(errno));
752                         return -1;
753                 }
754         }
755         bs = READ_SIZE;
756         if (ioctl(fd, ZT_SET_BLOCKSIZE, &bs) == -1) return -1;
757         return fd;
758 }
759
760 static void zt_close(int fd)
761 {
762         close(fd);
763 }
764
765 int zt_setlinear(int zfd, int linear)
766 {
767         int res;
768         res = ioctl(zfd, ZT_SETLINEAR, &linear);
769         if (res)
770                 return res;
771         return 0;
772 }
773
774
775 int zt_setlaw(int zfd, int law)
776 {
777         int res;
778         res = ioctl(zfd, ZT_SETLAW, &law);
779         if (res)
780                 return res;
781         return 0;
782 }
783
784 static int alloc_sub(struct zt_pvt *p, int x)
785 {
786         ZT_BUFFERINFO bi;
787         int res;
788         if (p->subs[x].zfd < 0) {
789                 p->subs[x].zfd = zt_open("/dev/zap/pseudo");
790                 if (p->subs[x].zfd > -1) {
791                         res = ioctl(p->subs[x].zfd, ZT_GET_BUFINFO, &bi);
792                         if (!res) {
793                                 bi.txbufpolicy = ZT_POLICY_IMMEDIATE;
794                                 bi.rxbufpolicy = ZT_POLICY_IMMEDIATE;
795                                 bi.numbufs = numbufs;
796                                 res = ioctl(p->subs[x].zfd, ZT_SET_BUFINFO, &bi);
797                                 if (res < 0) {
798                                         ast_log(LOG_WARNING, "Unable to set buffer policy on channel %d\n", x);
799                                 }
800                         } else 
801                                 ast_log(LOG_WARNING, "Unable to check buffer policy on channel %d\n", x);
802                         if (ioctl(p->subs[x].zfd, ZT_CHANNO, &p->subs[x].chan) == 1) {
803                                 ast_log(LOG_WARNING,"Unable to get channel number for pseudo channel on FD %d\n",p->subs[x].zfd);
804                                 zt_close(p->subs[x].zfd);
805                                 p->subs[x].zfd = -1;
806                                 return -1;
807                         }
808                         if (option_debug)
809                                 ast_log(LOG_DEBUG, "Allocated %s subchannel on FD %d channel %d\n", subnames[x], p->subs[x].zfd, p->subs[x].chan);
810                         return 0;
811                 } else
812                         ast_log(LOG_WARNING, "Unable to open pseudo channel: %s\n", strerror(errno));
813                 return -1;
814         }
815         ast_log(LOG_WARNING, "%s subchannel of %d already in use\n", subnames[x], p->channel);
816         return -1;
817 }
818
819 static int unalloc_sub(struct zt_pvt *p, int x)
820 {
821         if (!x) {
822                 ast_log(LOG_WARNING, "Trying to unalloc the real channel %d?!?\n", p->channel);
823                 return -1;
824         }
825         ast_log(LOG_DEBUG, "Released sub %d of channel %d\n", x, p->channel);
826         if (p->subs[x].zfd > -1) {
827                 zt_close(p->subs[x].zfd);
828         }
829         p->subs[x].zfd = -1;
830         p->subs[x].linear = 0;
831         p->subs[x].chan = 0;
832         p->subs[x].owner = NULL;
833         p->subs[x].inthreeway = 0;
834         memset(&p->subs[x].curconf, 0, sizeof(p->subs[x].curconf));
835         return 0;
836 }
837
838 static int zt_digit(struct ast_channel *ast, char digit)
839 {
840         ZT_DIAL_OPERATION zo;
841         struct zt_pvt *p;
842         int res = 0;
843         int index;
844         p = ast->pvt->pvt;
845         ast_mutex_lock(&p->lock);
846         index = zt_get_index(ast, p, 0);
847         if (index == SUB_REAL) {
848 #ifdef ZAPATA_PRI
849                 if (p->sig == SIG_PRI && ast->_state == AST_STATE_DIALING && (p->proceeding < 2)) {
850                         if (p->setup_ack) {
851                                 if (!pri_grab(p, p->pri)) {
852                                         pri_information(p->pri->pri,p->call,digit);
853                                         pri_rel(p->pri);
854                                 } else
855                                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
856                         } else if (strlen(p->dialdest) < sizeof(p->dialdest) - 1) {
857                                 ast_log(LOG_DEBUG, "Queueing digit '%c' since setup_ack not yet received\n", digit);
858                                 res = strlen(p->dialdest);
859                                 p->dialdest[res++] = digit;
860                                 p->dialdest[res] = '\0';
861                         }
862                 } else {
863 #else
864                 {
865 #endif
866                         zo.op = ZT_DIAL_OP_APPEND;
867                         zo.dialstr[0] = 'T';
868                         zo.dialstr[1] = digit;
869                         zo.dialstr[2] = 0;
870                         if ((res = ioctl(p->subs[SUB_REAL].zfd, ZT_DIAL, &zo)))
871                                 ast_log(LOG_WARNING, "Couldn't dial digit %c\n", digit);
872                         else
873                                 p->dialing = 1;
874                 }
875         }
876         ast_mutex_unlock(&p->lock);
877         return res;
878 }
879
880 static char *events[] = {
881         "No event",
882         "On hook",
883         "Ring/Answered",
884         "Wink/Flash",
885         "Alarm",
886         "No more alarm",
887                 "HDLC Abort",
888                 "HDLC Overrun",
889                 "HDLC Bad FCS",
890                 "Dial Complete",
891                 "Ringer On",
892                 "Ringer Off",
893                 "Hook Transition Complete",
894                 "Bits Changed",
895                 "Pulse Start"
896 };
897
898 static struct {
899         int alarm;
900         char *name;
901 } alarms[] = {
902         { ZT_ALARM_RED, "Red Alarm" },
903         { ZT_ALARM_YELLOW, "Yellow Alarm" },
904         { ZT_ALARM_BLUE, "Blue Alarm" },
905         { ZT_ALARM_RECOVER, "Recovering" },
906         { ZT_ALARM_LOOPBACK, "Loopback" },
907         { ZT_ALARM_NOTOPEN, "Not Open" },
908         { ZT_ALARM_NONE, "None" },
909 };
910
911 static char *alarm2str(int alarm)
912 {
913         int x;
914         for (x=0;x<sizeof(alarms) / sizeof(alarms[0]); x++) {
915                 if (alarms[x].alarm & alarm)
916                         return alarms[x].name;
917         }
918         return alarm ? "Unknown Alarm" : "No Alarm";
919 }
920
921 static char *event2str(int event)
922 {
923         static char buf[256];
924         if ((event < 15) && (event > -1))
925                 return events[event];
926         sprintf(buf, "Event %d", event);
927         return buf;
928 }
929
930 #ifdef ZAPATA_R2
931 static int str2r2prot(char *swtype)
932 {
933     if (!strcasecmp(swtype, "ar"))
934         return MFCR2_PROT_ARGENTINA;
935     /*endif*/
936     if (!strcasecmp(swtype, "cn"))
937         return MFCR2_PROT_CHINA;
938     /*endif*/
939     if (!strcasecmp(swtype, "kr"))
940         return MFCR2_PROT_KOREA;
941     /*endif*/
942     return -1;
943 }
944 #endif
945
946 static char *sig2str(int sig)
947 {
948         static char buf[256];
949         switch(sig) {
950         case SIG_EM:
951                 return "E & M Immediate";
952         case SIG_EMWINK:
953                 return "E & M Wink";
954         case SIG_EM_E1:
955                 return "E & M E1";
956         case SIG_FEATD:
957                 return "Feature Group D (DTMF)";
958         case SIG_FEATDMF:
959                 return "Feature Group D (MF)";
960         case SIG_FEATB:
961                 return "Feature Group B (MF)";
962         case SIG_E911:
963                 return "E911 (MF)";
964         case SIG_FXSLS:
965                 return "FXS Loopstart";
966         case SIG_FXSGS:
967                 return "FXS Groundstart";
968         case SIG_FXSKS:
969                 return "FXS Kewlstart";
970         case SIG_FXOLS:
971                 return "FXO Loopstart";
972         case SIG_FXOGS:
973                 return "FXO Groundstart";
974         case SIG_FXOKS:
975                 return "FXO Kewlstart";
976         case SIG_PRI:
977                 return "PRI Signalling";
978         case SIG_R2:
979                 return "R2 Signalling";
980         case SIG_SF:
981                 return "SF (Tone) Signalling Immediate";
982         case SIG_SFWINK:
983                 return "SF (Tone) Signalling Wink";
984         case SIG_SF_FEATD:
985                 return "SF (Tone) Signalling with Feature Group D (DTMF)";
986         case SIG_SF_FEATDMF:
987                 return "SF (Tone) Signalling with Feature Group D (MF)";
988         case SIG_SF_FEATB:
989                 return "SF (Tone) Signalling with Feature Group B (MF)";
990         case SIG_GR303FXOKS:
991                 return "GR-303 Signalling with FXOKS";
992         case 0:
993                 return "Pseudo Signalling";
994         default:
995                 snprintf(buf, sizeof(buf), "Unknown signalling %d", sig);
996                 return buf;
997         }
998 }
999
1000 static int conf_add(struct zt_pvt *p, struct zt_subchannel *c, int index, int slavechannel)
1001 {
1002         /* If the conference already exists, and we're already in it
1003            don't bother doing anything */
1004         ZT_CONFINFO zi;
1005         
1006         memset(&zi, 0, sizeof(zi));
1007         zi.chan = 0;
1008
1009         if (slavechannel > 0) {
1010                 /* If we have only one slave, do a digital mon */
1011                 zi.confmode = ZT_CONF_DIGITALMON;
1012                 zi.confno = slavechannel;
1013         } else {
1014                 if (!index) {
1015                         /* Real-side and pseudo-side both participate in conference */
1016                         zi.confmode = ZT_CONF_REALANDPSEUDO | ZT_CONF_TALKER | ZT_CONF_LISTENER |
1017                                                                 ZT_CONF_PSEUDO_TALKER | ZT_CONF_PSEUDO_LISTENER;
1018                 } else
1019                         zi.confmode = ZT_CONF_CONF | ZT_CONF_TALKER | ZT_CONF_LISTENER;
1020                 zi.confno = p->confno;
1021         }
1022         if ((zi.confno == c->curconf.confno) && (zi.confmode == c->curconf.confmode))
1023                 return 0;
1024         if (c->zfd < 0)
1025                 return 0;
1026         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1027                 ast_log(LOG_WARNING, "Failed to add %d to conference %d/%d\n", c->zfd, zi.confmode, zi.confno);
1028                 return -1;
1029         }
1030         if (slavechannel < 1) {
1031                 p->confno = zi.confno;
1032         }
1033         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1034         ast_log(LOG_DEBUG, "Added %d to conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1035         return 0;
1036 }
1037
1038 static int isourconf(struct zt_pvt *p, struct zt_subchannel *c)
1039 {
1040         /* If they're listening to our channel, they're ours */ 
1041         if ((p->channel == c->curconf.confno) && (c->curconf.confmode == ZT_CONF_DIGITALMON))
1042                 return 1;
1043         /* If they're a talker on our (allocated) conference, they're ours */
1044         if ((p->confno > 0) && (p->confno == c->curconf.confno) && (c->curconf.confmode & ZT_CONF_TALKER))
1045                 return 1;
1046         return 0;
1047 }
1048
1049 static int conf_del(struct zt_pvt *p, struct zt_subchannel *c, int index)
1050 {
1051         ZT_CONFINFO zi;
1052         if (/* Can't delete if there's no zfd */
1053                 (c->zfd < 0) ||
1054                 /* Don't delete from the conference if it's not our conference */
1055                 !isourconf(p, c)
1056                 /* Don't delete if we don't think it's conferenced at all (implied) */
1057                 ) return 0;
1058         memset(&zi, 0, sizeof(zi));
1059         zi.chan = 0;
1060         zi.confno = 0;
1061         zi.confmode = 0;
1062         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1063                 ast_log(LOG_WARNING, "Failed to drop %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1064                 return -1;
1065         }
1066         ast_log(LOG_DEBUG, "Removed %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1067         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1068         return 0;
1069 }
1070
1071 static int isslavenative(struct zt_pvt *p, struct zt_pvt **out)
1072 {
1073         int x;
1074         int useslavenative;
1075         struct zt_pvt *slave = NULL;
1076         /* Start out optimistic */
1077         useslavenative = 1;
1078         /* Update conference state in a stateless fashion */
1079         for (x=0;x<3;x++) {
1080                 /* Any three-way calling makes slave native mode *definitely* out
1081                    of the question */
1082                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway)
1083                         useslavenative = 0;
1084         }
1085         /* If we don't have any 3-way calls, check to see if we have
1086            precisely one slave */
1087         if (useslavenative) {
1088                 for (x=0;x<MAX_SLAVES;x++) {
1089                         if (p->slaves[x]) {
1090                                 if (slave) {
1091                                         /* Whoops already have a slave!  No 
1092                                            slave native and stop right away */
1093                                         slave = NULL;
1094                                         useslavenative = 0;
1095                                         break;
1096                                 } else {
1097                                         /* We have one slave so far */
1098                                         slave = p->slaves[x];
1099                                 }
1100                         }
1101                 }
1102         }
1103         /* If no slave, slave native definitely out */
1104         if (!slave)
1105                 useslavenative = 0;
1106         else if (slave->law != p->law) {
1107                 useslavenative = 0;
1108                 slave = NULL;
1109         }
1110         if (out)
1111                 *out = slave;
1112         return useslavenative;
1113 }
1114
1115 static int update_conf(struct zt_pvt *p)
1116 {
1117         int needconf = 0;
1118         int x;
1119         int useslavenative;
1120         struct zt_pvt *slave = NULL;
1121
1122         useslavenative = isslavenative(p, &slave);
1123         /* Start with the obvious, general stuff */
1124         for (x=0;x<3;x++) {
1125                 /* Look for three way calls */
1126                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway) {
1127                         conf_add(p, &p->subs[x], x, 0);
1128                         needconf++;
1129                 } else {
1130                         conf_del(p, &p->subs[x], x);
1131                 }
1132         }
1133         /* If we have a slave, add him to our conference now. or DAX
1134            if this is slave native */
1135         for (x=0;x<MAX_SLAVES;x++) {
1136                 if (p->slaves[x]) {
1137                         if (useslavenative)
1138                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, p->channel);
1139                         else {
1140                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, 0);
1141                                 needconf++;
1142                         }
1143                 }
1144         }
1145         /* If we're supposed to be in there, do so now */
1146         if (p->inconference && !p->subs[SUB_REAL].inthreeway) {
1147                 if (useslavenative)
1148                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, slave->channel);
1149                 else {
1150                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, 0);
1151                         needconf++;
1152                 }
1153         }
1154         /* If we have a master, add ourselves to his conference */
1155         if (p->master) {
1156                 if (isslavenative(p->master, NULL)) {
1157                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, p->master->channel);
1158                 } else {
1159                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, 0);
1160                 }
1161         }
1162         if (!needconf) {
1163                 /* Nobody is left (or should be left) in our conference.  
1164                    Kill it.  */
1165                 p->confno = -1;
1166         }
1167         ast_log(LOG_DEBUG, "Updated conferencing on %d, with %d conference users\n", p->channel, needconf);
1168         return 0;
1169 }
1170
1171 static void zt_enable_ec(struct zt_pvt *p)
1172 {
1173         int x;
1174         int res;
1175         if (p->echocanon) {
1176                 ast_log(LOG_DEBUG, "Echo cancellation already on\n");
1177                 return;
1178         }
1179         if (p && p->echocancel) {
1180                 if (p->sig == SIG_PRI) {
1181                         x = 1;
1182                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x);
1183                         if (res)
1184                                 ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1185                 }
1186                 x = p->echocancel;
1187                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1188                 if (res) 
1189                         ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1190                 else {
1191                         p->echocanon = 1;
1192                         ast_log(LOG_DEBUG, "Enabled echo cancellation on channel %d\n", p->channel);
1193                 }
1194         } else
1195                 ast_log(LOG_DEBUG, "No echocancellation requested\n");
1196 }
1197
1198 static void zt_train_ec(struct zt_pvt *p)
1199 {
1200         int x;
1201         int res;
1202         if (p && p->echocancel && p->echotraining) {
1203                 x = 400;
1204                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOTRAIN, &x);
1205                 if (res) 
1206                         ast_log(LOG_WARNING, "Unable to request echo training on channel %d\n", p->channel);
1207                 else {
1208                         ast_log(LOG_DEBUG, "Engaged echo training on channel %d\n", p->channel);
1209                 }
1210         } else
1211                 ast_log(LOG_DEBUG, "No echo training requested\n");
1212 }
1213
1214 static void zt_disable_ec(struct zt_pvt *p)
1215 {
1216         int x;
1217         int res;
1218         if (p->echocancel) {
1219                 x = 0;
1220                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1221                 if (res) 
1222                         ast_log(LOG_WARNING, "Unable to disable echo cancellation on channel %d\n", p->channel);
1223                 else
1224                         ast_log(LOG_DEBUG, "disabled echo cancellation on channel %d\n", p->channel);
1225         }
1226         p->echocanon = 0;
1227 }
1228
1229 int set_actual_gain(int fd, int chan, float rxgain, float txgain, int law)
1230 {
1231         struct  zt_gains g;
1232         float ltxgain;
1233         float lrxgain;
1234         int j,k;
1235         g.chan = chan;
1236         if ((rxgain != 0.0)  || (txgain != 0.0)) {
1237                 /* caluculate linear value of tx gain */
1238                 ltxgain = pow(10.0,txgain / 20.0);
1239                 /* caluculate linear value of rx gain */
1240                 lrxgain = pow(10.0,rxgain / 20.0);
1241                 if (law == ZT_LAW_ALAW) {
1242                         for (j=0;j<256;j++) {
1243                                 k = (int)(((float)AST_ALAW(j)) * lrxgain);
1244                                 if (k > 32767) k = 32767;
1245                                 if (k < -32767) k = -32767;
1246                                 g.rxgain[j] = AST_LIN2A(k);
1247                                 k = (int)(((float)AST_ALAW(j)) * ltxgain);
1248                                 if (k > 32767) k = 32767;
1249                                 if (k < -32767) k = -32767;
1250                                 g.txgain[j] = AST_LIN2A(k);
1251                         }
1252                 } else {
1253                         for (j=0;j<256;j++) {
1254                                 k = (int)(((float)AST_MULAW(j)) * lrxgain);
1255                                 if (k > 32767) k = 32767;
1256                                 if (k < -32767) k = -32767;
1257                                 g.rxgain[j] = AST_LIN2MU(k);
1258                                 k = (int)(((float)AST_MULAW(j)) * ltxgain);
1259                                 if (k > 32767) k = 32767;
1260                                 if (k < -32767) k = -32767;
1261                                 g.txgain[j] = AST_LIN2MU(k);
1262                         }
1263                 }
1264         } else {
1265                 for (j=0;j<256;j++) {
1266                         g.rxgain[j] = j;
1267                         g.txgain[j] = j;
1268                 }
1269         }
1270                 
1271           /* set 'em */
1272         return(ioctl(fd,ZT_SETGAINS,&g));
1273 }
1274
1275 static inline int zt_set_hook(int fd, int hs)
1276 {
1277         int x, res;
1278         x = hs;
1279         res = ioctl(fd, ZT_HOOK, &x);
1280         if (res < 0) 
1281         {
1282                 if (errno == EINPROGRESS) return 0;
1283                 ast_log(LOG_WARNING, "zt hook failed: %s\n", strerror(errno));
1284         }
1285         return res;
1286 }
1287
1288 static inline int zt_confmute(struct zt_pvt *p, int muted)
1289 {
1290         int x, y, res;
1291         x = muted;
1292         if (p->sig == SIG_PRI) {
1293                 y = 1;
1294                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &y);
1295                 if (res)
1296                         ast_log(LOG_WARNING, "Unable to set audio mode on '%d'\n", p->channel);
1297         }
1298         res = ioctl(p->subs[SUB_REAL].zfd, ZT_CONFMUTE, &x);
1299         if (res < 0) 
1300                 ast_log(LOG_WARNING, "zt confmute(%d) failed on channel %d: %s\n", muted, p->channel, strerror(errno));
1301         return res;
1302 }
1303
1304 static int save_conference(struct zt_pvt *p)
1305 {
1306         struct zt_confinfo c;
1307         int res;
1308         if (p->saveconf.confmode) {
1309                 ast_log(LOG_WARNING, "Can't save conference -- already in use\n");
1310                 return -1;
1311         }
1312         p->saveconf.chan = 0;
1313         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GETCONF, &p->saveconf);
1314         if (res) {
1315                 ast_log(LOG_WARNING, "Unable to get conference info: %s\n", strerror(errno));
1316                 p->saveconf.confmode = 0;
1317                 return -1;
1318         }
1319         c.chan = 0;
1320         c.confno = 0;
1321         c.confmode = ZT_CONF_NORMAL;
1322         res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &c);
1323         if (res) {
1324                 ast_log(LOG_WARNING, "Unable to set conference info: %s\n", strerror(errno));
1325                 return -1;
1326         }
1327         if (option_debug)
1328                 ast_log(LOG_DEBUG, "Disabled conferencing\n");
1329         return 0;
1330 }
1331
1332 static int restore_conference(struct zt_pvt *p)
1333 {
1334         int res;
1335         if (p->saveconf.confmode) {
1336                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &p->saveconf);
1337                 p->saveconf.confmode = 0;
1338                 if (res) {
1339                         ast_log(LOG_WARNING, "Unable to restore conference info: %s\n", strerror(errno));
1340                         return -1;
1341                 }
1342         }
1343         if (option_debug)
1344                 ast_log(LOG_DEBUG, "Restored conferencing\n");
1345         return 0;
1346 }
1347
1348 static int send_callerid(struct zt_pvt *p);
1349
1350 int send_cwcidspill(struct zt_pvt *p)
1351 {
1352         p->callwaitcas = 0;
1353         p->cidcwexpire = 0;
1354         p->cidspill = malloc(MAX_CALLERID_SIZE);
1355         if (p->cidspill) {
1356                 memset(p->cidspill, 0x7f, MAX_CALLERID_SIZE);
1357                 p->cidlen = ast_callerid_callwaiting_generate(p->cidspill, p->callwaitcid, AST_LAW(p));
1358                 /* Make sure we account for the end */
1359                 p->cidlen += READ_SIZE * 4;
1360                 p->cidpos = 0;
1361                 send_callerid(p);
1362                 if (option_verbose > 2)
1363                         ast_verbose(VERBOSE_PREFIX_3 "CPE supports Call Waiting Caller*ID.  Sending '%s'\n", p->callwaitcid);
1364         } else return -1;
1365         return 0;
1366 }
1367
1368 static int has_voicemail(struct zt_pvt *p)
1369 {
1370
1371         return ast_app_has_voicemail(p->mailbox);
1372 }
1373
1374 static int send_callerid(struct zt_pvt *p)
1375 {
1376         /* Assumes spill in p->cidspill, p->cidlen in length and we're p->cidpos into it */
1377         int res;
1378         /* Take out of linear mode if necessary */
1379         if (p->subs[SUB_REAL].linear) {
1380                 p->subs[SUB_REAL].linear = 0;
1381                 zt_setlinear(p->subs[SUB_REAL].zfd, 0);
1382         }
1383         while(p->cidpos < p->cidlen) {
1384                 res = write(p->subs[SUB_REAL].zfd, p->cidspill + p->cidpos, p->cidlen - p->cidpos);
1385                 if (res < 0) {
1386                         if (errno == EAGAIN)
1387                                 return 0;
1388                         else {
1389                                 ast_log(LOG_WARNING, "write failed: %s\n", strerror(errno));
1390                                 return -1;
1391                         }
1392                 }
1393                 if (!res)
1394                         return 0;
1395                 p->cidpos += res;
1396         }
1397         free(p->cidspill);
1398         p->cidspill = NULL;
1399         if (p->callwaitcas) {
1400                 /* Wait for CID/CW to expire */
1401                 p->cidcwexpire = CIDCW_EXPIRE_SAMPLES;
1402         } else
1403                 restore_conference(p);
1404         return 0;
1405 }
1406
1407 static int zt_callwait(struct ast_channel *ast)
1408 {
1409         struct zt_pvt *p = ast->pvt->pvt;
1410         p->callwaitingrepeat = CALLWAITING_REPEAT_SAMPLES;
1411         if (p->cidspill) {
1412                 ast_log(LOG_WARNING, "Spill already exists?!?\n");
1413                 free(p->cidspill);
1414         }
1415         p->cidspill = malloc(2400 /* SAS */ + 680 /* CAS */ + READ_SIZE * 4);
1416         if (p->cidspill) {
1417                 save_conference(p);
1418                 /* Silence */
1419                 memset(p->cidspill, 0x7f, 2400 + 600 + READ_SIZE * 4);
1420                 if (!p->callwaitrings && p->callwaitingcallerid) {
1421                         ast_gen_cas(p->cidspill, 1, 2400 + 680, AST_LAW(p));
1422                         p->callwaitcas = 1;
1423                         p->cidlen = 2400 + 680 + READ_SIZE * 4;
1424                 } else {
1425                         ast_gen_cas(p->cidspill, 1, 2400, AST_LAW(p));
1426                         p->callwaitcas = 0;
1427                         p->cidlen = 2400 + READ_SIZE * 4;
1428                 }
1429                 p->cidpos = 0;
1430                 send_callerid(p);
1431         } else {
1432                 ast_log(LOG_WARNING, "Unable to create SAS/CAS spill\n");
1433                 return -1;
1434         }
1435         return 0;
1436 }
1437
1438 static int zt_call(struct ast_channel *ast, char *rdest, int timeout)
1439 {
1440         struct zt_pvt *p = ast->pvt->pvt;
1441         int x, res, index;
1442         char *c, *n, *l;
1443 #ifdef ZAPATA_PRI
1444         char *s;
1445 #endif
1446         char callerid[256];
1447         char dest[256]; /* must be same length as p->dialdest */
1448         ast_mutex_lock(&p->lock);
1449         strncpy(dest, rdest, sizeof(dest) - 1);
1450         strncpy(p->dialdest, rdest, sizeof(dest) - 1);
1451         if ((ast->_state == AST_STATE_BUSY)) {
1452                 p->subs[SUB_REAL].needbusy = 1;
1453                 ast_mutex_unlock(&p->lock);
1454                 return 0;
1455         }
1456         if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
1457                 ast_log(LOG_WARNING, "zt_call called on %s, neither down nor reserved\n", ast->name);
1458                 ast_mutex_unlock(&p->lock);
1459                 return -1;
1460         }
1461         p->dialednone = 0;
1462         if (p->radio)  /* if a radio channel, up immediately */
1463         {
1464                 /* Special pseudo -- automatically up */
1465                 ast_setstate(ast, AST_STATE_UP); 
1466                 ast_mutex_unlock(&p->lock);
1467                 return 0;
1468         }
1469         x = ZT_FLUSH_READ | ZT_FLUSH_WRITE;
1470         res = ioctl(p->subs[SUB_REAL].zfd, ZT_FLUSH, &x);
1471         if (res)
1472                 ast_log(LOG_WARNING, "Unable to flush input on channel %d\n", p->channel);
1473         p->outgoing = 1;
1474
1475         set_actual_gain(p->subs[SUB_REAL].zfd, 0, p->rxgain, p->txgain, p->law);
1476
1477         switch(p->sig) {
1478         case SIG_FXOLS:
1479         case SIG_FXOGS:
1480         case SIG_FXOKS:
1481                 if (p->owner == ast) {
1482                         /* Normal ring, on hook */
1483                         
1484                         /* Don't send audio while on hook, until the call is answered */
1485                         p->dialing = 1;
1486                         if (p->use_callerid) {
1487                                 /* Generate the Caller-ID spill if desired */
1488                                 if (p->cidspill) {
1489                                         ast_log(LOG_WARNING, "cidspill already exists??\n");
1490                                         free(p->cidspill);
1491                                 }
1492                                 p->cidspill = malloc(MAX_CALLERID_SIZE);
1493                                 p->callwaitcas = 0;
1494                                 if (p->cidspill) {
1495                                         p->cidlen = ast_callerid_generate(p->cidspill, ast->callerid, AST_LAW(p));
1496                                         p->cidpos = 0;
1497                                         send_callerid(p);
1498                                 } else
1499                                         ast_log(LOG_WARNING, "Unable to generate CallerID spill\n");
1500                         }
1501                         /* Choose proper cadence */
1502                         if ((p->distinctivering > 0) && (p->distinctivering <= num_cadence)) {
1503                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, &cadences[p->distinctivering-1]))
1504                                         ast_log(LOG_WARNING, "Unable to set distinctive ring cadence %d on '%s'\n", p->distinctivering, ast->name);
1505                                 p->cidrings = cidrings[p->distinctivering - 1];
1506                         } else {
1507                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, NULL))
1508                                         ast_log(LOG_WARNING, "Unable to reset default ring on '%s'\n", ast->name);
1509                                 p->cidrings = DEFAULT_CIDRINGS;
1510                         }
1511
1512
1513                         /* nick@dccinc.com 4/3/03 mods to allow for deferred dialing */
1514                         c = strchr(dest, '/');
1515                         if (c)
1516                                 c++;
1517                         if (c && (strlen(c) < p->stripmsd)) {
1518                                 ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1519                                 c = NULL;
1520                         }
1521                         if (c) {
1522                                 p->dop.op = ZT_DIAL_OP_REPLACE;
1523                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "Tw%s", c);
1524                                 ast_log(LOG_DEBUG, "FXO: setup deferred dialstring: %s\n", c);
1525                         } else {
1526                                 strcpy(p->dop.dialstr, "");
1527                         }
1528                         x = ZT_RING;
1529                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x) && (errno != EINPROGRESS)) {
1530                                 ast_log(LOG_WARNING, "Unable to ring phone: %s\n", strerror(errno));
1531                                 ast_mutex_unlock(&p->lock);
1532                                 return -1;
1533                         }
1534                         p->dialing = 1;
1535                 } else {
1536                         /* Call waiting call */
1537                         p->callwaitrings = 0;
1538                         if (ast->callerid)
1539                                 strncpy(p->callwaitcid, ast->callerid, sizeof(p->callwaitcid)-1);
1540                         else
1541                                 strcpy(p->callwaitcid, "");
1542                         /* Call waiting tone instead */
1543                         if (zt_callwait(ast)) {
1544                                 ast_mutex_unlock(&p->lock);
1545                                 return -1;
1546                         }
1547                         /* Make ring-back */
1548                         if (tone_zone_play_tone(p->subs[SUB_CALLWAIT].zfd, ZT_TONE_RINGTONE))
1549                                 ast_log(LOG_WARNING, "Unable to generate call-wait ring-back on channel %s\n", ast->name);
1550                                 
1551                 }
1552                 if (ast->callerid) 
1553                         strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1554                 else
1555                         strcpy(callerid, "");
1556                 ast_callerid_parse(callerid, &n, &l);
1557                 if (l) {
1558                         ast_shrink_phone_number(l);
1559                         if (!ast_isphonenumber(l))
1560                                 l = NULL;
1561                 }
1562                 if (l)
1563                         strcpy(p->lastcallerid, l);
1564                 else
1565                         strcpy(p->lastcallerid, "");
1566                 ast_setstate(ast, AST_STATE_RINGING);
1567                 index = zt_get_index(ast, p, 0);
1568                 if (index > -1) {
1569                         p->subs[index].needringing = 1;
1570                 }
1571                 break;
1572         case SIG_FXSLS:
1573         case SIG_FXSGS:
1574         case SIG_FXSKS:
1575         case SIG_EMWINK:
1576         case SIG_EM:
1577         case SIG_EM_E1:
1578         case SIG_FEATD:
1579         case SIG_FEATDMF:
1580         case SIG_E911:
1581         case SIG_FEATB:
1582         case SIG_SFWINK:
1583         case SIG_SF:
1584         case SIG_SF_FEATD:
1585         case SIG_SF_FEATDMF:
1586         case SIG_SF_FEATB:
1587                 c = strchr(dest, '/');
1588                 if (c)
1589                         c++;
1590                 else
1591                         c = "";
1592                 if (strlen(c) < p->stripmsd) {
1593                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1594                         ast_mutex_unlock(&p->lock);
1595                         return -1;
1596                 }
1597                 x = ZT_START;
1598                 /* Start the trunk */
1599                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
1600                 if (res < 0) {
1601                         if (errno != EINPROGRESS) {
1602                                 ast_log(LOG_WARNING, "Unable to start channel: %s\n", strerror(errno));
1603                                 ast_mutex_unlock(&p->lock);
1604                                 return -1;
1605                         }
1606                 }
1607                 ast_log(LOG_DEBUG, "Dialing '%s'\n", c);
1608                 p->dop.op = ZT_DIAL_OP_REPLACE;
1609                 if (p->sig == SIG_FEATD) {
1610                         if (ast->callerid) {
1611                                 strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1612                                 ast_callerid_parse(callerid, &n, &l);
1613                                 if (l) {
1614                                         ast_shrink_phone_number(l);
1615                                         if (!ast_isphonenumber(l))
1616                                                 l = NULL;
1617                                 }
1618                         } else
1619                                 l = NULL;
1620                         if (l) 
1621                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T*%s*%s*", l, c + p->stripmsd);
1622                         else
1623                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T**%s*", c + p->stripmsd);
1624                 } else 
1625                 if (p->sig == SIG_FEATDMF) {
1626                         if (ast->callerid) {
1627                                 strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1628                                 ast_callerid_parse(callerid, &n, &l);
1629                                 if (l) {
1630                                         ast_shrink_phone_number(l);
1631                                         if (!ast_isphonenumber(l))
1632                                                 l = NULL;
1633                                 }
1634                         } else
1635                                 l = NULL;
1636                         if (l) 
1637                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*00%s#*%s#", l, c + p->stripmsd);
1638                         else
1639                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*02#*%s#", c + p->stripmsd);
1640                 } else 
1641                 if (p->sig == SIG_E911) {
1642                         strcpy(p->dop.dialstr,"M*911#");
1643                 } else
1644                 if (p->sig == SIG_FEATB) {
1645                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*%s#", c + p->stripmsd);
1646                 } else 
1647                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%sw", c + p->stripmsd);
1648                 if (strlen(p->dop.dialstr) > 4) {
1649                         strcpy(p->echorest, "w");
1650                         strcpy(p->echorest + 1, p->dop.dialstr + strlen(p->dop.dialstr) - 2);
1651                         p->echobreak = 1;
1652                         p->dop.dialstr[strlen(p->dop.dialstr)-2] = '\0';
1653                 } else
1654                         p->echobreak = 0;
1655                 if (!res) {
1656                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_DIAL, &p->dop)) {
1657                                 x = ZT_ONHOOK;
1658                                 ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
1659                                 ast_log(LOG_WARNING, "Dialing failed on channel %d: %s\n", p->channel, strerror(errno));
1660                                 ast_mutex_unlock(&p->lock);
1661                                 return -1;
1662                         }
1663                 } else
1664                         ast_log(LOG_DEBUG, "Deferring dialing...\n");
1665                 p->dialing = 1;
1666                 if (strlen(c + p->stripmsd) < 1) p->dialednone = 1;
1667                 ast_setstate(ast, AST_STATE_DIALING);
1668                 break;
1669         case 0:
1670                 /* Special pseudo -- automatically up*/
1671                 ast_setstate(ast, AST_STATE_UP);
1672                 break;          
1673         case SIG_PRI:
1674                 /* We'll get it in a moment -- but use dialdest to store pre-setup_ack digits */
1675                 strcpy(p->dialdest, "");
1676                 break;
1677         default:
1678                 ast_log(LOG_DEBUG, "not yet implemented\n");
1679                 ast_mutex_unlock(&p->lock);
1680                 return -1;
1681         }
1682 #ifdef ZAPATA_PRI
1683         if (p->pri) {
1684                 struct pri_sr *sr;
1685                 c = strchr(dest, '/');
1686                 if (c)
1687                         c++;
1688                 else
1689                         c = dest;
1690                 if (ast->callerid && !p->hidecallerid) {
1691                         strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1692                         ast_callerid_parse(callerid, &n, &l);
1693                         if (l) {
1694                                 ast_shrink_phone_number(l);
1695                                 if (!ast_isphonenumber(l))
1696                                         l = NULL;
1697                         }
1698                 } else
1699                         l = NULL;
1700                 if (strlen(c) < p->stripmsd) {
1701                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1702                         ast_mutex_unlock(&p->lock);
1703                         return -1;
1704                 }
1705                 p->dop.op = ZT_DIAL_OP_REPLACE;
1706                 s = strchr(c + p->stripmsd, 'w');
1707                 if (s) {
1708                         if (strlen(s))
1709                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%s", s);
1710                         else
1711                                 strcpy(p->dop.dialstr, "");
1712                         *s = '\0';
1713                 } else {
1714                         strcpy(p->dop.dialstr, "");
1715                 }
1716                 if (pri_grab(p, p->pri)) {
1717                         ast_log(LOG_WARNING, "Failed to grab PRI!\n");
1718                         ast_mutex_unlock(&p->lock);
1719                         return -1;
1720                 }
1721                 if (!(p->call = pri_new_call(p->pri->pri))) {
1722                         ast_log(LOG_WARNING, "Unable to create call on channel %d\n", p->channel);
1723                         pri_rel(p->pri);
1724                         ast_mutex_unlock(&p->lock);
1725                         return -1;
1726                 }
1727                 if (!(sr = pri_sr_new())) {
1728                         ast_log(LOG_WARNING, "Failed to allocate setup request channel %d\n", p->channel);
1729                         pri_rel(p->pri);
1730                         ast_mutex_unlock(&p->lock);
1731                 }
1732                 if (p->bearer) {
1733                         ast_log(LOG_DEBUG, "Oooh, I have a bearer on %d (%d:%d)\n", PVT_TO_CHANNEL(p->bearer), p->bearer->logicalspan, p->bearer->channel);
1734                         pri_set_crv(p->pri->pri, p->call, p->channel, 0);
1735                         p->bearer->call = p->call;
1736                 }
1737                 p->digital = ast_test_flag(ast,AST_FLAG_DIGITAL);
1738                 pri_sr_set_channel(sr, p->bearer ? PVT_TO_CHANNEL(p->bearer) : PVT_TO_CHANNEL(p), 
1739                                                                 p->pri->nodetype == PRI_NETWORK ? 0 : 1, 1);
1740                 pri_sr_set_bearer(sr, p->digital ? PRI_TRANS_CAP_DIGITAL : PRI_TRANS_CAP_SPEECH, 
1741                                         (p->digital ? -1 : 
1742                                                 ((p->law == ZT_LAW_ALAW) ? PRI_LAYER_1_ALAW : PRI_LAYER_1_ULAW)));
1743                 pri_sr_set_called(sr, c + p->stripmsd, p->pri->dialplan - 1,  s ? 1 : 0);
1744                 pri_sr_set_caller(sr, l, n, p->pri->dialplan - 1, 
1745                                         l ? (ast->restrictcid ? PRES_PROHIB_USER_NUMBER_PASSED_SCREEN : 
1746                                                 (p->use_callingpres ? ast->callingpres : PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN)) : 
1747                                                  PRES_NUMBER_NOT_AVAILABLE);
1748                 if (pri_setup(p->pri->pri, p->call,  sr)) {
1749                         ast_log(LOG_WARNING, "Unable to setup call to %s\n", c + p->stripmsd);
1750                         pri_rel(p->pri);
1751                         ast_mutex_unlock(&p->lock);
1752                         pri_sr_free(sr);
1753                         return -1;
1754                 }
1755                 pri_sr_free(sr);
1756                 ast_setstate(ast, AST_STATE_DIALING);
1757                 pri_rel(p->pri);
1758         }
1759 #endif          
1760         ast_mutex_unlock(&p->lock);
1761         return 0;
1762 }
1763
1764 static void destroy_zt_pvt(struct zt_pvt **pvt)
1765 {
1766         struct zt_pvt *p = *pvt;
1767         ast_mutex_destroy(&p->lock);
1768         free(p);
1769         *pvt = NULL;
1770 }
1771
1772 static int destroy_channel(struct zt_pvt *prev, struct zt_pvt *cur, int now)
1773 {
1774         int owned = 0;
1775         int i = 0;
1776
1777         if (!now) {
1778                 if (cur->owner) {
1779                         owned = 1;
1780                 }
1781
1782                 for (i = 0; i < 3; i++) {
1783                         if (cur->subs[i].owner) {
1784                                 owned = 1;
1785                         }
1786                 }
1787                 if (!owned) {
1788                         if (prev) {
1789                                 prev->next = cur->next;
1790                                 if (prev->next)
1791                                         prev->next->prev = prev;
1792                                 else
1793                                         ifend = prev;
1794                         } else {
1795                                 iflist = cur->next;
1796                                 if (iflist)
1797                                         iflist->prev = NULL;
1798                                 else
1799                                         ifend = NULL;
1800                         }
1801                         if (cur->subs[SUB_REAL].zfd > -1) {
1802                                 zt_close(cur->subs[SUB_REAL].zfd);
1803                         }
1804                         destroy_zt_pvt(&cur);
1805                 }
1806         } else {
1807                 if (prev) {
1808                         prev->next = cur->next;
1809                         if (prev->next)
1810                                 prev->next->prev = prev;
1811                         else
1812                                 ifend = prev;
1813                 } else {
1814                         iflist = cur->next;
1815                         if (iflist)
1816                                 iflist->prev = NULL;
1817                         else
1818                                 ifend = NULL;
1819                 }
1820                 if (cur->subs[SUB_REAL].zfd > -1) {
1821                         zt_close(cur->subs[SUB_REAL].zfd);
1822                 }
1823                 destroy_zt_pvt(&cur);
1824         }
1825         return 0;
1826 }
1827
1828 #ifdef ZAPATA_PRI
1829 int pri_is_up(struct zt_pri *pri)
1830 {
1831         int x;
1832         for (x=0;x<NUM_DCHANS;x++) {
1833                 if (pri->dchanavail[x] == DCHAN_AVAILABLE)
1834                         return 1;
1835         }
1836         return 0;
1837 }
1838
1839 int pri_assign_bearer(struct zt_pvt *crv, struct zt_pri *pri, struct zt_pvt *bearer)
1840 {
1841         bearer->owner = &inuse;
1842         bearer->master = crv;
1843         crv->subs[SUB_REAL].zfd = bearer->subs[SUB_REAL].zfd;
1844         crv->bearer = bearer;
1845         crv->call = bearer->call;
1846         crv->pri = pri;
1847         return 0;
1848 }
1849
1850 static char *pri_order(int level)
1851 {
1852         switch(level) {
1853         case 0:
1854                 return "Primary";
1855         case 1:
1856                 return "Secondary";
1857         case 2:
1858                 return "Tertiary";
1859         case 3:
1860                 return "Quaternary";
1861         default:
1862                 return "<Unknown>";
1863         }               
1864 }
1865
1866 int pri_find_dchan(struct zt_pri *pri)
1867 {
1868         int oldslot = -1;
1869         struct pri *old;
1870         int newslot = -1;
1871         int x;
1872         old = pri->pri;
1873         for(x=0;x<NUM_DCHANS;x++) {
1874                 if ((pri->dchanavail[x] == DCHAN_AVAILABLE) && (newslot < 0))
1875                         newslot = x;
1876                 if (pri->dchans[x] == old) {
1877                         oldslot = x;
1878                 }
1879         }
1880         if (newslot < 0) {
1881                 newslot = 0;
1882                 ast_log(LOG_WARNING, "No D-channels available!  Using Primary on channel anyway %d!\n",
1883                         pri->dchannels[newslot]);
1884         }
1885         if (old && (oldslot != newslot))
1886                 ast_log(LOG_NOTICE, "Switching from from d-channel %d to channel %d!\n",
1887                         pri->dchannels[oldslot], pri->dchannels[newslot]);
1888         pri->pri = pri->dchans[newslot];
1889         return 0;
1890 }
1891 #endif
1892
1893 static int zt_hangup(struct ast_channel *ast)
1894 {
1895         int res;
1896         int index,x, law;
1897         static int restore_gains(struct zt_pvt *p);
1898         struct zt_pvt *p = ast->pvt->pvt;
1899         struct zt_pvt *tmp = NULL;
1900         struct zt_pvt *prev = NULL;
1901         ZT_PARAMS par;
1902
1903         if (option_debug)
1904                 ast_log(LOG_DEBUG, "zt_hangup(%s)\n", ast->name);
1905         if (!ast->pvt->pvt) {
1906                 ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
1907                 return 0;
1908         }
1909         
1910         ast_mutex_lock(&p->lock);
1911         
1912         index = zt_get_index(ast, p, 1);
1913
1914         if (p->sig == SIG_PRI) {
1915                 x = 1;
1916                 ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
1917         }
1918
1919         x = 0;
1920         zt_confmute(p, 0);
1921         restore_gains(p);
1922         if (p->origcallerid) {
1923                 strncpy(p->callerid, p->origcallerid, sizeof(p->callerid) - 1);
1924                 free(p->origcallerid);
1925                 p->origcallerid = NULL;
1926         }       
1927         if (p->dsp)
1928                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);
1929         if (p->exten)
1930                 strcpy(p->exten, "");
1931
1932         ast_log(LOG_DEBUG, "Hangup: channel: %d index = %d, normal = %d, callwait = %d, thirdcall = %d\n",
1933                 p->channel, index, p->subs[SUB_REAL].zfd, p->subs[SUB_CALLWAIT].zfd, p->subs[SUB_THREEWAY].zfd);
1934         p->ignoredtmf = 0;
1935         
1936         if (index > -1) {
1937                 /* Real channel, do some fixup */
1938                 p->subs[index].owner = NULL;
1939                 p->subs[index].needanswer = 0;
1940                 p->subs[index].needringing = 0;
1941                 p->subs[index].needbusy = 0;
1942                 p->subs[index].needcongestion = 0;
1943                 p->subs[index].linear = 0;
1944                 p->subs[index].needcallerid = 0;
1945                 zt_setlinear(p->subs[index].zfd, 0);
1946                 if (index == SUB_REAL) {
1947                         if ((p->subs[SUB_CALLWAIT].zfd > -1) && (p->subs[SUB_THREEWAY].zfd > -1)) {
1948                                 ast_log(LOG_DEBUG, "Normal call hung up with both three way call and a call waiting call in place?\n");
1949                                 if (p->subs[SUB_CALLWAIT].inthreeway) {
1950                                         /* We had flipped over to answer a callwait and now it's gone */
1951                                         ast_log(LOG_DEBUG, "We were flipped over to the callwait, moving back and unowning.\n");
1952                                         /* Move to the call-wait, but un-own us until they flip back. */
1953                                         swap_subs(p, SUB_CALLWAIT, SUB_REAL);
1954                                         unalloc_sub(p, SUB_CALLWAIT);
1955                                         p->owner = NULL;
1956                                 } else {
1957                                         /* The three way hung up, but we still have a call wait */
1958                                         ast_log(LOG_DEBUG, "We were in the threeway and have a callwait still.  Ditching the threeway.\n");
1959                                         swap_subs(p, SUB_THREEWAY, SUB_REAL);
1960                                         unalloc_sub(p, SUB_THREEWAY);
1961                                         if (p->subs[SUB_REAL].inthreeway) {
1962                                                 /* This was part of a three way call.  Immediately make way for
1963                                                    another call */
1964                                                 ast_log(LOG_DEBUG, "Call was complete, setting owner to former third call\n");
1965                                                 p->owner = p->subs[SUB_REAL].owner;
1966                                         } else {
1967                                                 /* This call hasn't been completed yet...  Set owner to NULL */
1968                                                 ast_log(LOG_DEBUG, "Call was incomplete, setting owner to NULL\n");
1969                                                 p->owner = NULL;
1970                                         }
1971                                         p->subs[SUB_REAL].inthreeway = 0;
1972                                 }
1973                         } else if (p->subs[SUB_CALLWAIT].zfd > -1) {
1974                                 /* Move to the call-wait and switch back to them. */
1975                                 swap_subs(p, SUB_CALLWAIT, SUB_REAL);
1976                                 unalloc_sub(p, SUB_CALLWAIT);
1977                                 p->owner = p->subs[SUB_REAL].owner;
1978                                 if (p->owner->_state != AST_STATE_UP)
1979                                         p->subs[SUB_REAL].needanswer = 1;
1980                                 if (p->subs[SUB_REAL].owner->bridge)
1981                                         ast_moh_stop(p->subs[SUB_REAL].owner->bridge);
1982                         } else if (p->subs[SUB_THREEWAY].zfd > -1) {
1983                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
1984                                 unalloc_sub(p, SUB_THREEWAY);
1985                                 if (p->subs[SUB_REAL].inthreeway) {
1986                                         /* This was part of a three way call.  Immediately make way for
1987                                            another call */
1988                                         ast_log(LOG_DEBUG, "Call was complete, setting owner to former third call\n");
1989                                         p->owner = p->subs[SUB_REAL].owner;
1990                                 } else {
1991                                         /* This call hasn't been completed yet...  Set owner to NULL */
1992                                         ast_log(LOG_DEBUG, "Call was incomplete, setting owner to NULL\n");
1993                                         p->owner = NULL;
1994                                 }
1995                                 p->subs[SUB_REAL].inthreeway = 0;
1996                         }
1997                 } else if (index == SUB_CALLWAIT) {
1998                         /* Ditch the holding callwait call, and immediately make it availabe */
1999                         if (p->subs[SUB_CALLWAIT].inthreeway) {
2000                                 /* This is actually part of a three way, placed on hold.  Place the third part
2001                                    on music on hold now */
2002                                 if (p->subs[SUB_THREEWAY].owner && p->subs[SUB_THREEWAY].owner->bridge)
2003                                         ast_moh_start(p->subs[SUB_THREEWAY].owner->bridge, NULL);
2004                                 p->subs[SUB_THREEWAY].inthreeway = 0;
2005                                 /* Make it the call wait now */
2006                                 swap_subs(p, SUB_CALLWAIT, SUB_THREEWAY);
2007                                 unalloc_sub(p, SUB_THREEWAY);
2008                         } else
2009                                 unalloc_sub(p, SUB_CALLWAIT);
2010                 } else if (index == SUB_THREEWAY) {
2011                         if (p->subs[SUB_CALLWAIT].inthreeway) {
2012                                 /* The other party of the three way call is currently in a call-wait state.
2013                                    Start music on hold for them, and take the main guy out of the third call */
2014                                 if (p->subs[SUB_CALLWAIT].owner && p->subs[SUB_CALLWAIT].owner->bridge)
2015                                         ast_moh_start(p->subs[SUB_CALLWAIT].owner->bridge, NULL);
2016                                 p->subs[SUB_CALLWAIT].inthreeway = 0;
2017                         }
2018                         p->subs[SUB_REAL].inthreeway = 0;
2019                         /* If this was part of a three way call index, let us make
2020                            another three way call */
2021                         unalloc_sub(p, SUB_THREEWAY);
2022                 } else {
2023                         /* This wasn't any sort of call, but how are we an index? */
2024                         ast_log(LOG_WARNING, "Index found but not any type of call?\n");
2025                 }
2026         }
2027
2028
2029         if (!p->subs[SUB_REAL].owner && !p->subs[SUB_CALLWAIT].owner && !p->subs[SUB_THREEWAY].owner) {
2030                 p->owner = NULL;
2031                 p->ringt = 0;
2032                 p->distinctivering = 0;
2033                 p->confirmanswer = 0;
2034                 p->cidrings = 1;
2035                 p->outgoing = 0;
2036                 p->digital = 0;
2037                 p->faxhandled = 0;
2038                 p->pulsedial = 0;
2039                 p->onhooktime = time(NULL);
2040 #ifdef ZAPATA_PRI
2041                 p->proceeding = 0;
2042                 p->setup_ack = 0;
2043 #endif          
2044                 if (p->dsp) {
2045                         ast_dsp_free(p->dsp);
2046                         p->dsp = NULL;
2047                 }
2048
2049                 law = ZT_LAW_DEFAULT;
2050                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETLAW, &law);
2051                 if (res < 0) 
2052                         ast_log(LOG_WARNING, "Unable to set law on channel %d to default\n", p->channel);
2053                 /* Perform low level hangup if no owner left */
2054 #ifdef ZAPATA_PRI
2055                 if (p->pri) {
2056                         /* Make sure we have a call (or REALLY have a call in the case of a PRI) */
2057                         if (p->call && (!p->bearer || (p->bearer->call == p->call))) {
2058                                 if (!pri_grab(p, p->pri)) {
2059                                         if (p->alreadyhungup) {
2060                                                 ast_log(LOG_DEBUG, "Already hungup...  Calling hangup once, and clearing call\n");
2061                                                 pri_hangup(p->pri->pri, p->call, -1);
2062                                                 p->call = NULL;
2063                                                 if (p->bearer) 
2064                                                         p->bearer->call = NULL;
2065                                         } else {
2066                                                 char *cause = pbx_builtin_getvar_helper(ast,"PRI_CAUSE");
2067                                                 int icause = ast->hangupcause ? hangup_cause2pri(ast->hangupcause) : -1;
2068                                                 ast_log(LOG_DEBUG, "Not yet hungup...  Calling hangup once with icause, and clearing call\n");
2069                                                 p->alreadyhungup = 1;
2070                                                 if (p->bearer)
2071                                                         p->bearer->alreadyhungup = 1;
2072                                                 if (cause) {
2073                                                         if (atoi(cause))
2074                                                                 icause = atoi(cause);
2075                                                 }
2076                                                 pri_hangup(p->pri->pri, p->call, icause);
2077                                         }
2078                                         if (res < 0) 
2079                                                 ast_log(LOG_WARNING, "pri_disconnect failed\n");
2080                                         pri_rel(p->pri);                        
2081                                 } else {
2082                                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
2083                                         res = -1;
2084                                 }
2085                         } else {
2086                                 if (p->bearer)
2087                                         ast_log(LOG_DEBUG, "Bearer call is %p, while ours is still %p\n", p->bearer->call, p->call);
2088                                 p->call = NULL;
2089                                 res = 0;
2090                         }
2091                 }
2092 #endif
2093 #ifdef ZAPATA_R2
2094                 if (p->sig == SIG_R2) {
2095                         if (p->hasr2call) {
2096                                 mfcr2_DropCall(p->r2, NULL, UC_NORMAL_CLEARING);
2097                                 p->hasr2call = 0;
2098                                 res = 0;
2099                         } else
2100                                 res = 0;
2101
2102                 }
2103 #endif
2104                 if (p->sig && (p->sig != SIG_PRI) && (p->sig != SIG_R2))
2105                         res = zt_set_hook(p->subs[SUB_REAL].zfd, ZT_ONHOOK);
2106                 if (res < 0) {
2107                         ast_log(LOG_WARNING, "Unable to hangup line %s\n", ast->name);
2108                 }
2109                 switch(p->sig) {
2110                 case SIG_FXOGS:
2111                 case SIG_FXOLS:
2112                 case SIG_FXOKS:
2113                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GET_PARAMS, &par);
2114                         if (!res) {
2115 #if 0
2116                                 ast_log(LOG_DEBUG, "Hanging up channel %d, offhook = %d\n", p->channel, par.rxisoffhook);
2117 #endif
2118                                 /* If they're off hook, try playing congestion */
2119                                 if (par.rxisoffhook)
2120                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, ZT_TONE_CONGESTION);
2121                                 else
2122                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2123                         }
2124                         break;
2125                 case SIG_FXSGS:
2126                 case SIG_FXSLS:
2127                 case SIG_FXSKS:
2128                         /* Make sure we're not made available for at least two seconds */
2129                         time(&p->guardtime);
2130                         p->guardtime += 2;
2131                         break;
2132                 default:
2133                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2134                 }
2135                 if (p->cidspill)
2136                         free(p->cidspill);
2137                 if (p->sig)
2138                         zt_disable_ec(p);
2139                 x = 0;
2140                 ast_channel_setoption(ast,AST_OPTION_TONE_VERIFY,&x,sizeof(char),0);
2141                 ast_channel_setoption(ast,AST_OPTION_TDD,&x,sizeof(char),0);
2142                 p->didtdd = 0;
2143                 p->cidspill = NULL;
2144                 p->callwaitcas = 0;
2145                 p->callwaiting = p->permcallwaiting;
2146                 p->hidecallerid = p->permhidecallerid;
2147                 p->dialing = 0;
2148                 strcpy(p->rdnis, "");
2149                 update_conf(p);
2150                 /* Restore data mode */
2151                 if (p->sig == SIG_PRI) {
2152                         x = 0;
2153                         ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
2154                 }
2155 #ifdef ZAPATA_PRI
2156                 if (p->bearer) {
2157                         ast_log(LOG_DEBUG, "Freeing up bearer channel %d\n", p->bearer->channel);
2158                         /* Free up the bearer channel as well, and
2159                            don't use its file descriptor anymore */
2160                         p->bearer->owner = NULL;
2161                         p->bearer = NULL;
2162                         p->subs[SUB_REAL].zfd = -1;
2163                         p->pri = NULL;
2164                 }
2165 #endif
2166                 restart_monitor();
2167         }
2168
2169
2170         p->callwaitingrepeat = 0;
2171         p->cidcwexpire = 0;
2172         ast->pvt->pvt = NULL;
2173         ast_mutex_unlock(&p->lock);
2174         ast_mutex_lock(&usecnt_lock);
2175         usecnt--;
2176         if (usecnt < 0) 
2177                 ast_log(LOG_WARNING, "Usecnt < 0???\n");
2178         ast_mutex_unlock(&usecnt_lock);
2179         ast_update_use_count();
2180         if (option_verbose > 2) 
2181                 ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
2182
2183         ast_mutex_lock(&iflock);
2184         tmp = iflist;
2185         prev = NULL;
2186         if (p->destroy) {
2187                 while (tmp) {
2188                         if (tmp == p) {
2189                                 destroy_channel(prev, tmp, 0);
2190                                 break;
2191                         } else {
2192                                 prev = tmp;
2193                                 tmp = tmp->next;
2194                         }
2195                 }
2196         }
2197         ast_mutex_unlock(&iflock);
2198         return 0;
2199 }
2200
2201 static int zt_answer(struct ast_channel *ast)
2202 {
2203         struct zt_pvt *p = ast->pvt->pvt;
2204         int res=0;
2205         int index;
2206         int oldstate = ast->_state;
2207         ast_setstate(ast, AST_STATE_UP);
2208         ast_mutex_lock(&p->lock);
2209         index = zt_get_index(ast, p, 0);
2210         if (index < 0)
2211                 index = SUB_REAL;
2212         /* nothing to do if a radio channel */
2213         if (p->radio) {
2214                 ast_mutex_unlock(&p->lock);
2215                 return 0;
2216         }
2217         switch(p->sig) {
2218         case SIG_FXSLS:
2219         case SIG_FXSGS:
2220         case SIG_FXSKS:
2221                 p->ringt = 0;
2222                 /* Fall through */
2223         case SIG_EM:
2224         case SIG_EM_E1:
2225         case SIG_EMWINK:
2226         case SIG_FEATD:
2227         case SIG_FEATDMF:
2228         case SIG_E911:
2229         case SIG_FEATB:
2230         case SIG_SF:
2231         case SIG_SFWINK:
2232         case SIG_SF_FEATD:
2233         case SIG_SF_FEATDMF:
2234         case SIG_SF_FEATB:
2235         case SIG_FXOLS:
2236         case SIG_FXOGS:
2237         case SIG_FXOKS:
2238                 /* Pick up the line */
2239                 ast_log(LOG_DEBUG, "Took %s off hook\n", ast->name);
2240                 res =  zt_set_hook(p->subs[SUB_REAL].zfd, ZT_OFFHOOK);
2241                 tone_zone_play_tone(p->subs[index].zfd, -1);
2242                 p->dialing = 0;
2243                 if ((index == SUB_REAL) && p->subs[SUB_THREEWAY].inthreeway) {
2244                         if (oldstate == AST_STATE_RINGING) {
2245                                 ast_log(LOG_DEBUG, "Finally swapping real and threeway\n");
2246                                 tone_zone_play_tone(p->subs[SUB_THREEWAY].zfd, -1);
2247                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
2248                                 p->owner = p->subs[SUB_REAL].owner;
2249                         }
2250                 }
2251                 if (p->sig & __ZT_SIG_FXS) {
2252                         zt_enable_ec(p);
2253                         zt_train_ec(p);
2254                 }
2255                 break;
2256 #ifdef ZAPATA_PRI
2257         case SIG_PRI:
2258                 /* Send a pri acknowledge */
2259                 if (!pri_grab(p, p->pri)) {
2260                         p->proceeding = 2;
2261                         res = pri_answer(p->pri->pri, p->call, 0, 1);
2262                         pri_rel(p->pri);
2263                 } else {
2264                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
2265                         res= -1;
2266                 }
2267                 break;
2268 #endif
2269 #ifdef ZAPATA_R2
2270         case SIG_R2:
2271                 res = mfcr2_AnswerCall(p->r2, NULL);
2272                 if (res)
2273                         ast_log(LOG_WARNING, "R2 Answer call failed :( on %s\n", ast->name);
2274                 break;
2275 #endif                  
2276         case 0:
2277                 ast_mutex_unlock(&p->lock);
2278                 return 0;
2279         default:
2280                 ast_log(LOG_WARNING, "Don't know how to answer signalling %d (channel %d)\n", p->sig, p->channel);
2281                 res = -1;
2282         }
2283         ast_mutex_unlock(&p->lock);
2284         return res;
2285 }
2286
2287 static int zt_setoption(struct ast_channel *chan, int option, void *data, int datalen)
2288 {
2289 char    *cp;
2290 int     x;
2291
2292         struct zt_pvt *p = chan->pvt->pvt;
2293
2294         
2295         if ((option != AST_OPTION_TONE_VERIFY) && (option != AST_OPTION_AUDIO_MODE) &&
2296                 (option != AST_OPTION_TDD) && (option != AST_OPTION_RELAXDTMF))
2297            {
2298                 errno = ENOSYS;
2299                 return -1;
2300            }
2301         cp = (char *)data;
2302         if ((!cp) || (datalen < 1))
2303            {
2304                 errno = EINVAL;
2305                 return -1;
2306            }
2307         switch(option) {
2308             case AST_OPTION_TONE_VERIFY:
2309                 if (!p->dsp)
2310                         break;
2311                 switch(*cp) {
2312                     case 1:
2313                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF(1) on %s\n",chan->name);
2314                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | p->dtmfrelax);  /* set mute mode if desired */
2315                         break;
2316                     case 2:
2317                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF/MAX(2) on %s\n",chan->name);
2318                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX | p->dtmfrelax);  /* set mute mode if desired */
2319                         break;
2320                     default:
2321                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: OFF(0) on %s\n",chan->name);
2322                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);  /* set mute mode if desired */
2323                         break;
2324                 }
2325                 break;
2326             case AST_OPTION_TDD:  /* turn on or off TDD */
2327                 if (!*cp) { /* turn it off */
2328                         ast_log(LOG_DEBUG, "Set option TDD MODE, value: OFF(0) on %s\n",chan->name);
2329                         if (p->tdd) tdd_free(p->tdd);
2330                         p->tdd = 0;
2331                         p->mate = 0;
2332                         break;
2333                 }
2334                 if (*cp == 2)
2335                         ast_log(LOG_DEBUG, "Set option TDD MODE, value: MATE(2) on %s\n",chan->name);
2336                 else ast_log(LOG_DEBUG, "Set option TDD MODE, value: ON(1) on %s\n",chan->name);
2337                 p->mate = 0;
2338                 zt_disable_ec(p);
2339                 /* otherwise, turn it on */
2340                 if (!p->didtdd) { /* if havent done it yet */
2341                         unsigned char mybuf[41000],*buf;
2342                         int size,res,fd,len;
2343                         int index;
2344                         struct pollfd fds[1];
2345                         buf = mybuf;
2346                         memset(buf,0x7f,sizeof(mybuf)); /* set to silence */
2347                         ast_tdd_gen_ecdisa(buf + 16000,16000);  /* put in tone */
2348                         len = 40000;
2349                         index = zt_get_index(chan, p, 0);
2350                         if (index < 0) {
2351                                 ast_log(LOG_WARNING, "No index in TDD?\n");
2352                                 return -1;
2353                         }
2354                         fd = p->subs[index].zfd;
2355                         while(len) {
2356                                 if (ast_check_hangup(chan)) return -1;
2357                                 size = len;
2358                                 if (size > READ_SIZE)
2359                                         size = READ_SIZE;
2360                                 fds[0].fd = fd;
2361                                 fds[0].events = POLLPRI | POLLOUT;
2362                                 res = poll(fds, 1, -1);
2363                                 if (!res) {
2364                                         ast_log(LOG_DEBUG, "poll (for write) ret. 0 on channel %d\n", p->channel);
2365                                         continue;
2366                                 }
2367                                   /* if got exception */
2368                                 if (fds[0].revents & POLLPRI) return -1;
2369                                 if (!(fds[0].revents & POLLOUT)) {
2370                                         ast_log(LOG_DEBUG, "write fd not ready on channel %d\n", p->channel);
2371                                         continue;
2372                                 }
2373                                 res = write(fd, buf, size);
2374                                 if (res != size) {
2375                                         if (res == -1) return -1;
2376                                         ast_log(LOG_DEBUG, "Write returned %d (%s) on channel %d\n", res, strerror(errno), p->channel);
2377                                         break;
2378                                 }
2379                                 len -= size;
2380                                 buf += size;
2381                         }
2382                         p->didtdd = 1; /* set to have done it now */            
2383                 }
2384                 if (*cp == 2) { /* Mate mode */
2385                         if (p->tdd) tdd_free(p->tdd);
2386                         p->tdd = 0;
2387                         p->mate = 1;
2388                         break;
2389                         }               
2390                 if (!p->tdd) { /* if we dont have one yet */
2391                         p->tdd = tdd_new(); /* allocate one */
2392                 }               
2393                 break;
2394             case AST_OPTION_RELAXDTMF:  /* Relax DTMF decoding (or not) */
2395                 if (!*cp)
2396                 {               
2397                         ast_log(LOG_DEBUG, "Set option RELAX DTMF, value: OFF(0) on %s\n",chan->name);
2398                         x = 0;
2399                 }
2400                 else
2401                 {               
2402                         ast_log(LOG_DEBUG, "Set option RELAX DTMF, value: ON(1) on %s\n",chan->name);
2403                         x = 1;
2404                 }
2405                 ast_dsp_digitmode(p->dsp,x ? DSP_DIGITMODE_RELAXDTMF : DSP_DIGITMODE_DTMF | p->dtmfrelax);
2406                 break;
2407             case AST_OPTION_AUDIO_MODE:  /* Set AUDIO mode (or not) */
2408                 if (!*cp)
2409                 {               
2410                         ast_log(LOG_DEBUG, "Set option AUDIO MODE, value: OFF(0) on %s\n",chan->name);
2411                         x = 0;
2412                         zt_disable_ec(p);
2413                 }
2414                 else
2415                 {               
2416                         ast_log(LOG_DEBUG, "Set option AUDIO MODE, value: ON(1) on %s\n",chan->name);
2417                         x = 1;
2418                 }
2419                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x) == -1)
2420                         ast_log(LOG_WARNING, "Unable to set audio mode on channel %d to %d\n", p->channel, x);
2421                 break;
2422         }
2423         errno = 0;
2424         return 0;
2425 }
2426
2427 static void zt_unlink(struct zt_pvt *slave, struct zt_pvt *master, int needlock)
2428 {
2429         /* Unlink a specific slave or all slaves/masters from a given master */
2430         int x;
2431         int hasslaves;
2432         if (!master)
2433                 return;
2434         if (needlock) {
2435                 ast_mutex_lock(&master->lock);
2436                 if (slave) {
2437                         while(ast_mutex_trylock(&slave->lock)) {
2438                                 ast_mutex_unlock(&master->lock);
2439                                 usleep(1);
2440                                 ast_mutex_lock(&master->lock);
2441                         }
2442                 }
2443         }
2444         hasslaves = 0;
2445         for (x=0;x<MAX_SLAVES;x++) {
2446                 if (master->slaves[x]) {
2447                         if (!slave || (master->slaves[x] == slave)) {
2448                                 /* Take slave out of the conference */
2449                                 ast_log(LOG_DEBUG, "Unlinking slave %d from %d\n", master->slaves[x]->channel, master->channel);
2450                                 conf_del(master, &master->slaves[x]->subs[SUB_REAL], SUB_REAL);
2451                                 conf_del(master->slaves[x], &master->subs[SUB_REAL], SUB_REAL);
2452                                 master->slaves[x]->master = NULL;
2453                                 master->slaves[x] = NULL;
2454                         } else
2455                                 hasslaves = 1;
2456                 }
2457                 if (!hasslaves)
2458                         master->inconference = 0;
2459         }
2460         if (!slave) {
2461                 if (master->master) {
2462                         /* Take master out of the conference */
2463                         conf_del(master->master, &master->subs[SUB_REAL], SUB_REAL);
2464                         conf_del(master, &master->master->subs[SUB_REAL], SUB_REAL);
2465                         hasslaves = 0;
2466                         for (x=0;x<MAX_SLAVES;x++) {
2467                                 if (master->master->slaves[x] == master)
2468                                         master->master->slaves[x] = NULL;
2469                                 else if (master->master->slaves[x])
2470                                         hasslaves = 1;
2471                         }
2472                         if (!hasslaves)
2473                                 master->master->inconference = 0;
2474                 }
2475                 master->master = NULL;
2476         }
2477         update_conf(master);
2478         if (needlock) {
2479                 if (slave)
2480                         ast_mutex_unlock(&slave->lock);
2481                 ast_mutex_unlock(&master->lock);
2482         }
2483 }
2484
2485 static void zt_link(struct zt_pvt *slave, struct zt_pvt *master) {
2486         int x;
2487         if (!slave || !master) {
2488                 ast_log(LOG_WARNING, "Tried to link to/from NULL??\n");
2489                 return;
2490         }
2491         for (x=0;x<MAX_SLAVES;x++) {
2492                 if (!master->slaves[x]) {
2493                         master->slaves[x] = slave;
2494                         break;
2495                 }
2496         }
2497         if (x >= MAX_SLAVES) {
2498                 ast_log(LOG_WARNING, "Replacing slave %d with new slave, %d\n", master->slaves[MAX_SLAVES - 1]->channel, slave->channel);
2499                 master->slaves[MAX_SLAVES - 1] = slave;
2500         }
2501         if (slave->master) 
2502                 ast_log(LOG_WARNING, "Replacing master %d with new master, %d\n", slave->master->channel, master->channel);
2503         slave->master = master;
2504         
2505         ast_log(LOG_DEBUG, "Making %d slave to master %d at %d\n", slave->channel, master->channel, x);
2506 }
2507
2508 static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
2509 {
2510         struct ast_channel *who = NULL, *cs[3];
2511         struct zt_pvt *p0, *p1, *op0, *op1;
2512         struct zt_pvt *master=NULL, *slave=NULL;
2513         struct ast_frame *f;
2514         int to;
2515         int inconf = 0;
2516         int nothingok = 0;
2517         int ofd1, ofd2;
2518         int oi1, oi2, i1 = -1, i2 = -1, t1, t2;
2519         int os1 = -1, os2 = -1;
2520         struct ast_channel *oc1, *oc2;
2521
2522         /* if need DTMF, cant native bridge */
2523         if (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))
2524                 return -2;
2525                 
2526         ast_mutex_lock(&c0->lock);
2527         ast_mutex_lock(&c1->lock);
2528
2529         p0 = c0->pvt->pvt;
2530         p1 = c1->pvt->pvt;
2531         /* cant do pseudo-channels here */
2532         if (!p0 || (!p0->sig) || !p1 || (!p1->sig)) {
2533                 ast_mutex_unlock(&c0->lock);
2534                 ast_mutex_unlock(&c1->lock);
2535                 return -2;
2536         }
2537
2538         op0 = p0 = c0->pvt->pvt;
2539         op1 = p1 = c1->pvt->pvt;
2540         ofd1 = c0->fds[0];
2541         ofd2 = c1->fds[0];
2542         oi1 = zt_get_index(c0, p0, 0);
2543         oi2 = zt_get_index(c1, p1, 0);
2544         oc1 = p0->owner;
2545         oc2 = p1->owner;
2546         if ((oi1 < 0) || (oi2 < 0)) {
2547                 ast_mutex_unlock(&c0->lock);
2548                 ast_mutex_unlock(&c1->lock);
2549                 return -1;
2550         }
2551
2552
2553
2554         ast_mutex_lock(&p0->lock);
2555         if (ast_mutex_trylock(&p1->lock)) {
2556                 /* Don't block, due to potential for deadlock */
2557                 ast_mutex_unlock(&p0->lock);
2558                 ast_mutex_unlock(&c0->lock);
2559                 ast_mutex_unlock(&c1->lock);
2560                 ast_log(LOG_NOTICE, "Avoiding deadlock...\n");
2561                 return -3;
2562         }
2563         if ((oi1 == SUB_REAL) && (oi2 == SUB_REAL)) {
2564                 if (!p0->owner || !p1->owner) {
2565                         /* Currently unowned -- Do nothing.  */
2566                         nothingok = 1;
2567                 } else {
2568                         /* If we don't have a call-wait in a 3-way, and we aren't in a 3-way, we can be master */
2569                         if (!p0->subs[SUB_CALLWAIT].inthreeway && !p1->subs[SUB_REAL].inthreeway) {
2570                                 master = p0;
2571                                 slave = p1;
2572                                 inconf = 1;
2573                         } else if (!p1->subs[SUB_CALLWAIT].inthreeway && !p0->subs[SUB_REAL].inthreeway) {
2574                                 master = p1;
2575                                 slave = p0;
2576                                 inconf = 1;
2577                         } else {
2578                                 ast_log(LOG_WARNING, "Huh?  Both calls are callwaits or 3-ways?  That's clever...?\n");
2579                                 ast_log(LOG_WARNING, "p0: chan %d/%d/CW%d/3W%d, p1: chan %d/%d/CW%d/3W%d\n", p0->channel, oi1, (p0->subs[SUB_CALLWAIT].zfd > -1) ? 1 : 0, p0->subs[SUB_REAL].inthreeway,
2580                                                 p0->channel, oi1, (p1->subs[SUB_CALLWAIT].zfd > -1) ? 1 : 0, p1->subs[SUB_REAL].inthreeway);
2581                         }
2582                 }
2583         } else if ((oi1 == SUB_REAL) && (oi2 == SUB_THREEWAY)) {
2584                 if (p1->subs[SUB_THREEWAY].inthreeway) {
2585                         master = p1;
2586                         slave = p0;
2587                 } else {
2588                         nothingok = 1;
2589                 }
2590         } else if ((oi1 == SUB_THREEWAY) && (oi2 == SUB_REAL)) {
2591                 if (p0->subs[SUB_THREEWAY].inthreeway) {
2592                         master = p0;
2593                         slave = p1;
2594                 } else {
2595                         nothingok  = 1;
2596                 }
2597         } else if ((oi1 == SUB_REAL) && (oi2 == SUB_CALLWAIT)) {
2598                 /* We have a real and a call wait.  If we're in a three way call, put us in it, otherwise, 
2599                    don't put us in anything */
2600                 if (p1->subs[SUB_CALLWAIT].inthreeway) {
2601                         master = p1;
2602                         slave = p0;
2603                 } else {
2604                         nothingok = 1;
2605                 }
2606         } else if ((oi1 == SUB_CALLWAIT) && (oi2 == SUB_REAL)) {
2607                 /* Same as previous */
2608                 if (p0->subs[SUB_CALLWAIT].inthreeway) {
2609                         master = p0;
2610                         slave = p1;
2611                 } else {
2612                         nothingok = 1;
2613                 }
2614         }
2615         ast_log(LOG_DEBUG, "master: %d, slave: %d, nothingok: %d\n",
2616                 master ? master->channel : 0, slave ? slave->channel : 0, nothingok);
2617         if (master && slave) {
2618                 /* Stop any tones, or play ringtone as appropriate.  If they're bridged
2619                    in an active threeway call with a channel that is ringing, we should
2620                    indicate ringing. */
2621                 if ((oi2 == SUB_THREEWAY) && 
2622                         p1->subs[SUB_THREEWAY].inthreeway && 
2623                         p1->subs[SUB_REAL].owner && 
2624                         p1->subs[SUB_REAL].inthreeway && 
2625                         (p1->subs[SUB_REAL].owner->_state == AST_STATE_RINGING)) {
2626                                 ast_log(LOG_DEBUG, "Playing ringback on %s since %s is in a ringing three-way\n", c0->name, c1->name);
2627                                 tone_zone_play_tone(p0->subs[oi1].zfd, ZT_TONE_RINGTONE);
2628                                 os2 = p1->subs[SUB_REAL].owner->_state;
2629                 } else {
2630                                 ast_log(LOG_DEBUG, "Stoping tones on %d/%d talking to %d/%d\n", p0->channel, oi1, p1->channel, oi2);
2631                                 tone_zone_play_tone(p0->subs[oi1].zfd, -1);
2632                 }
2633                 if ((oi1 == SUB_THREEWAY) && 
2634                         p0->subs[SUB_THREEWAY].inthreeway && 
2635                         p0->subs[SUB_REAL].owner && 
2636                         p0->subs[SUB_REAL].inthreeway && 
2637                         (p0->subs[SUB_REAL].owner->_state == AST_STATE_RINGING)) {
2638                                 ast_log(LOG_DEBUG, "Playing ringback on %s since %s is in a ringing three-way\n", c1->name, c0->name);
2639                                 tone_zone_play_tone(p1->subs[oi2].zfd, ZT_TONE_RINGTONE);
2640                                 os1 = p0->subs[SUB_REAL].owner->_state;
2641                 } else {
2642                                 ast_log(LOG_DEBUG, "Stoping tones on %d/%d talking to %d/%d\n", p1->channel, oi2, p0->channel, oi1);
2643                                 tone_zone_play_tone(p1->subs[oi1].zfd, -1);
2644                 }
2645                 if ((oi1 == SUB_REAL) && (oi2 == SUB_REAL)) {
2646                         if (!p0->echocanbridged || !p1->echocanbridged) {
2647                                 /* Disable echo cancellation if appropriate */
2648                                 zt_disable_ec(p0);
2649                                 zt_disable_ec(p1);
2650                         }
2651                 }
2652                 zt_link(slave, master);
2653                 master->inconference = inconf;
2654         } else if (!nothingok)
2655                 ast_log(LOG_WARNING, "Can't link %d/%s with %d/%s\n", p0->channel, subnames[oi1], p1->channel, subnames[oi2]);
2656
2657         update_conf(p0);
2658         update_conf(p1);
2659         t1 = p0->subs[SUB_REAL].inthreeway;
2660         t2 = p1->subs[SUB_REAL].inthreeway;
2661
2662         ast_mutex_unlock(&p0->lock);
2663         ast_mutex_unlock(&p1->lock);
2664
2665         ast_mutex_unlock(&c0->lock);
2666         ast_mutex_unlock(&c1->lock);
2667
2668         /* Native bridge failed */
2669         if ((!master || !slave) && !nothingok) {
2670                 if (op0 == p0)
2671                         zt_enable_ec(p0);
2672                 if (op1 == p1)
2673                         zt_enable_ec(p1);
2674                 return -1;
2675         }
2676         
2677         cs[0] = c0;
2678         cs[1] = c1;
2679         cs[2] = NULL;
2680         for (;;) {
2681                 /* Here's our main loop...  Start by locking things, looking for private parts, 
2682                    and then balking if anything is wrong */
2683                 ast_mutex_lock(&c0->lock);
2684                 ast_mutex_lock(&c1->lock);
2685                 p0 = c0->pvt->pvt;
2686                 p1 = c1->pvt->pvt;
2687                 if (op0 == p0)
2688                         i1 = zt_get_index(c0, p0, 1);
2689                 if (op1 == p1)
2690                         i2 = zt_get_index(c1, p1, 1);
2691                 ast_mutex_unlock(&c0->lock);
2692                 ast_mutex_unlock(&c1->lock);
2693                 if ((op0 != p0) || (op1 != p1) || 
2694                     (ofd1 != c0->fds[0]) || 
2695                         (ofd2 != c1->fds[0]) ||
2696                     (p0->subs[SUB_REAL].owner && (os1 > -1) && (os1 != p0->subs[SUB_REAL].owner->_state)) || 
2697                     (p1->subs[SUB_REAL].owner && (os2 > -1) && (os2 != p1->subs[SUB_REAL].owner->_state)) || 
2698                     (oc1 != p0->owner) || 
2699                         (oc2 != p1->owner) ||
2700                         (t1 != p0->subs[SUB_REAL].inthreeway) ||
2701                         (t2 != p1->subs[SUB_REAL].inthreeway) ||
2702                         (oi1 != i1) ||
2703                         (oi2 != i2)) {
2704                         if (slave && master)
2705                                 zt_unlink(slave, master, 1);
2706                         ast_log(LOG_DEBUG, "Something changed out on %d/%d to %d/%d, returning -3 to restart\n",
2707                                                                         op0->channel, oi1, op1->channel, oi2);
2708                         if (op0 == p0)
2709                                 zt_enable_ec(p0);
2710                         if (op1 == p1)
2711                                 zt_enable_ec(p1);
2712                         return -3;
2713                 }
2714                 to = -1;
2715                 who = ast_waitfor_n(cs, 2, &to);
2716                 if (!who) {
2717                         ast_log(LOG_DEBUG, "Ooh, empty read...\n");
2718                         continue;
2719                 }
2720                 if (who->pvt->pvt == op0) 
2721                         op0->ignoredtmf = 1;
2722                 else if (who->pvt->pvt == op1)
2723                         op1->ignoredtmf = 1;
2724                 f = ast_read(who);
2725                 if (who->pvt->pvt == op0) 
2726                         op0->ignoredtmf = 0;
2727                 else if (who->pvt->pvt == op1)
2728                         op1->ignoredtmf = 0;
2729                 if (!f) {
2730                         *fo = NULL;
2731                         *rc = who;
2732                         if (slave && master)
2733                                 zt_unlink(slave, master, 1);
2734                         if (op0 == p0)
2735                                 zt_enable_ec(p0);
2736                         if (op1 == p1)
2737                                 zt_enable_ec(p1);
2738                         return 0;
2739                 }
2740                 if (f->frametype == AST_FRAME_DTMF) {
2741                         if (((who == c0) && (flags & AST_BRIDGE_DTMF_CHANNEL_0)) || 
2742                             ((who == c1) && (flags & AST_BRIDGE_DTMF_CHANNEL_1))) {
2743                                 *fo = f;
2744                                 *rc = who;
2745                                 if (slave && master)
2746                                         zt_unlink(slave, master, 1);
2747                                 return 0;
2748                         } else if ((who == c0) && p0->pulsedial) {
2749                                 ast_write(c1, f);
2750                         } else if ((who == c1) && p1->pulsedial) {
2751                                 ast_write(c0, f);
2752                         }
2753                 }
2754                 ast_frfree(f);
2755
2756                 /* Swap who gets priority */
2757                 cs[2] = cs[0];
2758                 cs[0] = cs[1];
2759                 cs[1] = cs[2];
2760         }
2761 }
2762
2763 static int zt_indicate(struct ast_channel *chan, int condition);
2764
2765 static int zt_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
2766 {
2767         struct zt_pvt *p = newchan->pvt->pvt;
2768         int x;
2769         ast_mutex_lock(&p->lock);
2770         ast_log(LOG_DEBUG, "New owner for channel %d is %s\n", p->channel, newchan->name);
2771         if (p->owner == oldchan) {
2772                 p->owner = newchan;
2773         }
2774         for (x=0;x<3;x++)
2775                 if (p->subs[x].owner == oldchan) {
2776                         if (!x)
2777                                 zt_unlink(NULL, p, 0);
2778                         p->subs[x].owner = newchan;
2779                 }
2780         if (newchan->_state == AST_STATE_RINGING) 
2781                 zt_indicate(newchan, AST_CONTROL_RINGING);
2782         update_conf(p);
2783         ast_mutex_unlock(&p->lock);
2784         return 0;
2785 }
2786
2787 static int zt_ring_phone(struct zt_pvt *p)
2788 {
2789         int x;
2790         int res;
2791         /* Make sure our transmit state is on hook */
2792         x = 0;
2793         x = ZT_ONHOOK;
2794         res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2795         do {
2796                 x = ZT_RING;
2797                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2798 #if 0
2799                 printf("Res: %d, error: %s\n", res, strerror(errno));
2800 #endif                                          
2801                 if (res) {
2802                         switch(errno) {
2803                         case EBUSY:
2804                         case EINTR:
2805                                 /* Wait just in case */
2806                                 usleep(10000);
2807                                 continue;
2808                         case EINPROGRESS:
2809                                 res = 0;
2810                                 break;
2811                         default:
2812                                 ast_log(LOG_WARNING, "Couldn't ring the phone: %s\n", strerror(errno));
2813                                 res = 0;
2814                         }
2815                 }
2816         } while (res);
2817         return res;
2818 }
2819
2820 static void *ss_thread(void *data);
2821
2822 static struct ast_channel *zt_new(struct zt_pvt *, int, int, int, int, int);
2823
2824 static int attempt_transfer(struct zt_pvt *p)
2825 {
2826         /* In order to transfer, we need at least one of the channels to
2827            actually be in a call bridge.  We can't conference two applications
2828            together (but then, why would we want to?) */
2829         if (p->subs[SUB_REAL].owner->bridge) {
2830                 /* The three-way person we're about to transfer to could still be in MOH, so
2831                    stop if now if appropriate */
2832                 if (p->subs[SUB_THREEWAY].owner->bridge)
2833                         ast_moh_stop(p->subs[SUB_THREEWAY].owner->bridge);
2834                 if (p->subs[SUB_THREEWAY].owner->_state == AST_STATE_RINGING) {
2835                         ast_indicate(p->subs[SUB_REAL].owner->bridge, AST_CONTROL_RINGING);
2836                 }
2837                 if (ast_channel_masquerade(p->subs[SUB_THREEWAY].owner, p->subs[SUB_REAL].owner->bridge)) {
2838                         ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
2839                                         p->subs[SUB_REAL].owner->bridge->name, p->subs[SUB_THREEWAY].owner->name);
2840                         return -1;
2841                 }
2842                 /* Orphan the channel */
2843                 unalloc_sub(p, SUB_THREEWAY);
2844         } else if (p->subs[SUB_THREEWAY].owner->bridge) {
2845                 if (p->subs[SUB_REAL].owner->_state == AST_STATE_RINGING) {
2846                         ast_indicate(p->subs[SUB_THREEWAY].owner->bridge, AST_CONTROL_RINGING);
2847                 }
2848                 ast_moh_stop(p->subs[SUB_THREEWAY].owner->bridge);
2849                 if (ast_channel_masquerade(p->subs[SUB_REAL].owner, p->subs[SUB_THREEWAY].owner->bridge)) {
2850                         ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
2851                                         p->subs[SUB_THREEWAY].owner->bridge->name, p->subs[SUB_REAL].owner->name);
2852                         return -1;
2853                 }
2854                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
2855                 unalloc_sub(p, SUB_THREEWAY);
2856                 /* Tell the caller not to hangup */
2857                 return 1;
2858         } else {
2859                 ast_log(LOG_DEBUG, "Neither %s nor %s are in a bridge, nothing to transfer\n",
2860                                         p->subs[SUB_REAL].owner->name, p->subs[SUB_THREEWAY].owner->name);
2861                 p->subs[SUB_THREEWAY].owner->_softhangup |= AST_SOFTHANGUP_DEV;
2862         }
2863         return 0;
2864 }
2865
2866 #ifdef ZAPATA_R2
2867 static struct ast_frame *handle_r2_event(struct zt_pvt *p, mfcr2_event_t *e, int index)
2868 {
2869         struct ast_frame *f;
2870         f = &p->subs[index].f;
2871         if (!p->r2) {
2872                 ast_log(LOG_WARNING, "Huh?  No R2 structure :(\n");
2873                 return NULL;
2874         }
2875         switch(e->e) {
2876         case MFCR2_EVENT_BLOCKED:
2877                 if (option_verbose > 2)
2878                         ast_verbose(VERBOSE_PREFIX_3 "Channel %d blocked\n", p->channel);
2879                 break;
2880         case MFCR2_EVENT_UNBLOCKED:
2881                 if (option_verbose > 2)
2882                         ast_verbose(VERBOSE_PREFIX_3 "Channel %d unblocked\n", p->channel);
2883                 break;
2884         case MFCR2_EVENT_CONFIG_ERR:
2885                 if (option_verbose > 2)
2886                         ast_verbose(VERBOSE_PREFIX_3 "Config error on channel %d\n", p->channel);
2887                 break;
2888         case MFCR2_EVENT_RING:
2889                 if (option_verbose > 2)
2890                         ast_verbose(VERBOSE_PREFIX_3 "Ring on channel %d\n", p->channel);
2891                 break;
2892         case MFCR2_EVENT_HANGUP:
2893                 if (option_verbose > 2)
2894                         ast_verbose(VERBOSE_PREFIX_3 "Hangup on channel %d\n", p->channel);
2895                 break;
2896         case MFCR2_EVENT_RINGING:
2897                 if (option_verbose > 2)
2898                         ast_verbose(VERBOSE_PREFIX_3 "Ringing on channel %d\n", p->channel);
2899                 break;
2900         case MFCR2_EVENT_ANSWER:
2901                 if (option_verbose > 2)
2902                         ast_verbose(VERBOSE_PREFIX_3 "Answer on channel %d\n", p->channel);
2903                 break;
2904         case MFCR2_EVENT_HANGUP_ACK:
2905                 if (option_verbose > 2)
2906                         ast_verbose(VERBOSE_PREFIX_3 "Hangup ACK on channel %d\n", p->channel);
2907                 break;
2908         case MFCR2_EVENT_IDLE:
2909                 if (option_verbose > 2)
2910                         ast_verbose(VERBOSE_PREFIX_3 "Idle on channel %d\n", p->channel);
2911                 break;
2912         default:
2913                 ast_log(LOG_WARNING, "Unknown MFC/R2 event %d\n", e->e);
2914                 break;
2915         }
2916         return f;
2917 }
2918
2919 static mfcr2_event_t *r2_get_event_bits(struct zt_pvt *p)
2920 {
2921         int x;
2922         int res;
2923         mfcr2_event_t *e;
2924         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GETRXBITS, &x);
2925         if (res) {
2926                 ast_log(LOG_WARNING, "Unable to check received bits\n");
2927                 return NULL;
2928         }
2929         if (!p->r2) {
2930                 ast_log(LOG_WARNING, "Odd, no R2 structure on channel %d\n", p->channel);
2931                 return NULL;
2932         }
2933         e = mfcr2_cas_signaling_event(p->r2, x);
2934         return e;
2935 }
2936 #endif
2937
2938 static int check_for_conference(struct zt_pvt *p)
2939 {
2940         ZT_CONFINFO ci;
2941         /* Fine if we already have a master, etc */
2942         if (p->master || (p->confno > -1))
2943                 return 0;
2944         memset(&ci, 0, sizeof(ci));
2945         if (ioctl(p->subs[SUB_REAL].zfd, ZT_GETCONF, &ci)) {
2946                 ast_log(LOG_WARNING, "Failed to get conference info on channel %d\n", p->channel);
2947                 return 0;
2948         }
2949         /* If we have no master and don't have a confno, then 
2950            if we're in a conference, it's probably a MeetMe room or
2951            some such, so don't let us 3-way out! */
2952         if ((p->subs[SUB_REAL].curconf.confno != ci.confno) || (p->subs[SUB_REAL].curconf.confmode != ci.confmode)) {
2953                 if (option_verbose > 2) 
2954                         ast_verbose(VERBOSE_PREFIX_3 "Avoiding 3-way call when in an external conference\n");
2955                 return 1;
2956         }
2957         return 0;
2958 }
2959
2960 static int get_alarms(struct zt_pvt *p)
2961 {
2962         int res;
2963         ZT_SPANINFO zi;
2964         memset(&zi, 0, sizeof(zi));
2965         zi.spanno = p->span;
2966         res = ioctl(p->subs[SUB_REAL].zfd, ZT_SPANSTAT, &zi);
2967         if (res < 0) {
2968                 ast_log(LOG_WARNING, "Unable to determine alarm on channel %d\n", p->channel);
2969                 return 0;
2970         }
2971         return zi.alarms;
2972 }
2973                         
2974 static struct ast_frame *zt_handle_event(struct ast_channel *ast)
2975 {
2976         int res,x;
2977         int index;
2978         char *c;
2979         struct zt_pvt *p = ast->pvt->pvt;
2980         pthread_t threadid;
2981         pthread_attr_t attr;
2982         struct ast_channel *chan;
2983         pthread_attr_init(&attr);
2984         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
2985         index = zt_get_index(ast, p, 0);
2986         p->subs[index].f.frametype = AST_FRAME_NULL;
2987         p->subs[index].f.datalen = 0;
2988         p->subs[index].f.samples = 0;
2989         p->subs[index].f.mallocd = 0;
2990         p->subs[index].f.offset = 0;
2991         p->subs[index].f.src = "zt_handle_event";
2992         p->subs[index].f.data = NULL;
2993         if (index < 0)
2994                 return &p->subs[index].f;
2995         if (p->fake_event) {
2996                 res = p->fake_event;