chan_vpb.c

/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * VoiceTronix Interface driver
 * 
 * Copyright (C) 2003, Paul Bagyenda
 *
 * Paul Bagyenda <bagyenda@dsmagic.com>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */


#include <stdio.h>
#include <pthread.h>
#include <string.h>
#include <asterisk/lock.h>
#include <asterisk/channel.h>
#include <asterisk/channel_pvt.h>
#include <asterisk/config.h>
#include <asterisk/logger.h>
#include <asterisk/module.h>
#include <asterisk/pbx.h>
#include <asterisk/options.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <ctype.h>

#include <vpbapi.h>

#define DEFAULT_GAIN 0
#define DEFAULT_ECHO_CANCEL 1
  
#define VPB_SAMPLES 240 
#define VPB_MAX_BUF VPB_SAMPLES*4 + AST_FRIENDLY_OFFSET

#define VPB_NULL_EVENT 200

#define VPB_WAIT_TIMEOUT 4000

#define MAX_VPB_GAIN 12.0

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

static char *desc = "VoiceTronix V6PCI/V12PCI/V4PCI  API Support";
static char *type = "vpb";
static char *tdesc = "Standard VoiceTronix API Driver";
static char *config = "vpb.conf";

/* Default context for dialtone mode */
static char context[AST_MAX_EXTENSION] = "default";

/* Default language */
static char language[MAX_LANGUAGE] = "";
static int usecnt =0;

static int gruntdetect_timeout = 3600000; /* Grunt detect timeout is 1hr. */

static const int prefformat = AST_FORMAT_SLINEAR;

static ast_mutex_t usecnt_lock = AST_MUTEX_INITIALIZER;

/* Protect the interface list (of vpb_pvt's) */
static ast_mutex_t iflock = AST_MUTEX_INITIALIZER;

/* Protect the monitoring thread, so only one process can kill or start it, and not
   when it's doing something critical. */
static ast_mutex_t monlock = AST_MUTEX_INITIALIZER;

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

static int mthreadactive = -1; /* Flag for monitoring monitorthread.*/


static int restart_monitor(void);

/* The private structures of the VPB channels are 
   linked for selecting outgoing channels */
   
#define MODE_DIALTONE 	1
#define MODE_IMMEDIATE	2
#define MODE_FXO	3

/* Pick a country or add your own! */
#define TONES_AU
#ifdef TONES_AU
static VPB_TONE Dialtone     = {440,   	440, 	440, 	-10,  	-10, 	-10, 	5000,	0   };
static VPB_TONE Busytone     = {470,   	0,   	0, 	-10,  	-100, 	-100,   5000, 	0 };
static VPB_TONE Ringbacktone = {400,   	50,   	440, 	-10,  	-10, 	-10,  	1400, 	800 };
#endif
/*
#define TONES_USA
#ifdef TONES_USA
static VPB_TONE Dialtone     = {425,   0,   0, -16,  -100, -100, 10000,    0};
static VPB_TONE Busytone     = {425,   0,   0, -10,  -100, -100,   500,  500};
static VPB_TONE Ringbacktone = {400,   425,   450, -20,  -20, -20,  1000, 1000};
#endif
*/

/* grunt tone defn's */
static VPB_DETECT toned_grunt = { 3, VPB_GRUNT, 1, 2000, 3000, 0, 0, -40, 0, 0, 0, 40, { { VPB_DELAY, 1000, 0, 0 }, { VPB_RISING, 0, 40, 0 }, { 0, 100, 0, 0 } } };
static VPB_DETECT toned_ungrunt = { 2, VPB_GRUNT, 1, 2000, 1, 0, 0, -40, 0, 0, 30, 40, { { 0, 0, 0, 0 } } };

/* Use loop drop detection */
static int UseLoopDrop=1;

#define TIMER_PERIOD_RINGBACK 2000
#define TIMER_PERIOD_BUSY 700
	  
#define VPB_EVENTS_ALL (VPB_MRING|VPB_MDIGIT|VPB_MDTMF|VPB_MTONEDETECT|VPB_MTIMEREXP|VPB_MPLAY_UNDERFLOW \
			|VPB_MRECORD_OVERFLOW|VPB_MSTATION_OFFHOOK|VPB_MSTATION_ONHOOK \
			|VPB_MRING_OFF|VPB_MDROP|VPB_MSTATION_FLASH)
#define VPB_EVENTS_NODTMF (VPB_MRING|VPB_MDIGIT|VPB_MTONEDETECT|VPB_MTIMEREXP|VPB_MPLAY_UNDERFLOW \
			|VPB_MRECORD_OVERFLOW|VPB_MSTATION_OFFHOOK|VPB_MSTATION_ONHOOK \
			|VPB_MRING_OFF|VPB_MDROP|VPB_MSTATION_FLASH)
#define VPB_EVENTS_STAT (VPB_MRING|VPB_MDIGIT|VPB_MDTMF|VPB_MTONEDETECT|VPB_MTIMEREXP|VPB_MPLAY_UNDERFLOW \
			|VPB_MRECORD_OVERFLOW|VPB_MSTATION_OFFHOOK|VPB_MSTATION_ONHOOK \
			|VPB_MRING_OFF|VPB_MSTATION_FLASH)


// Dialing parameters for Australia
//#define DIAL_WITH_CALL_PROGRESS
VPB_TONE_MAP DialToneMap[] = { 	{ VPB_BUSY_AUST, VPB_CALL_DISCONNECT, 0 },
  				{ VPB_DIAL, VPB_CALL_DIALTONE, 0 },
				{ VPB_RINGBACK_308, VPB_CALL_RINGBACK, 0 },
				{ VPB_BUSY_AUST, VPB_CALL_BUSY, 0 },
				{ VPB_GRUNT, VPB_CALL_GRUNT, 0 },
				{ 0, 0, 1 } };
#define VPB_DIALTONE_WAIT 2000 /* Wait up to 2s for a dialtone */
#define VPB_RINGWAIT 4000 /* Wait up to 4s for ring tone after dialing */
#define VPB_CONNECTED_WAIT 4000 /* If no ring tone detected for 4s then consider call connected */
#define TIMER_PERIOD_NOANSWER 120000 /* Let it ring for 120s before deciding theres noone there */

#define MAX_BRIDGES_V4PCI 2
#define MAX_BRIDGES_V12PCI 128

/* port states */
#define VPB_STATE_ONHOOK	0
#define VPB_STATE_OFFHOOK	1
#define VPB_STATE_DIALLING	2
#define VPB_STATE_JOINED	3
#define VPB_STATE_GETDTMF	4
#define VPB_STATE_PLAYDIAL	5
#define VPB_STATE_PLAYBUSY	6
#define VPB_STATE_PLAYRING	7


typedef struct  {
	int inuse;
	struct ast_channel *c0, *c1, **rc;
	struct ast_frame **fo;
	int flags;
	ast_mutex_t lock;
	pthread_cond_t cond;
	int endbridge;
} vpb_bridge_t;
static vpb_bridge_t * bridges;
static int max_bridges = MAX_BRIDGES_V4PCI;

static ast_mutex_t bridge_lock = AST_MUTEX_INITIALIZER;

typedef enum {
	vpb_model_unknown = 0, 
	vpb_model_v4pci,
	vpb_model_v12pci
} vpb_model_t;

static struct vpb_pvt {

	ast_mutex_t owner_lock;			/* Protect blocks that expect ownership to remain the same */
	struct ast_channel *owner;		/* Channel who owns us, possibly NULL */

	int golock;				/* Got owner lock ? */

	int mode;				/* fxo/imediate/dialtone*/
	int handle;				/* Handle for vpb interface */

	int state;				/* used to keep port state (internal to driver) */

	int group;				/* Which group this port belongs to */

	char dev[256];				/* Device name, eg vpb/1-1 */
	vpb_model_t vpb_model;			/* card model */

	struct ast_frame f, fr;			/* Asterisk frame interface */
	char buf[VPB_MAX_BUF];			/* Static buffer for reading frames */

	int dialtone;				/* NOT USED */
	float txgain, rxgain;			/* Hardware gain control */
	float txswgain, rxswgain;		/* Software gain control */

	int wantdtmf;				/* Waiting for DTMF. */
	char context[AST_MAX_EXTENSION];	/* The context for this channel */

	char ext[AST_MAX_EXTENSION];		/* DTMF buffer for the ext[ens] */
	char language[MAX_LANGUAGE];		/* language being used */
	char callerid[AST_MAX_EXTENSION];	/* CallerId used for directly connected phone */

	int lastoutput;				/* Holds the last Audio format output'ed */
	int lastinput;				/* Holds the last Audio format input'ed */
	int last_ignore_dtmf;

	void *busy_timer;			/* Void pointer for busy vpb_timer */
	int busy_timer_id;			/* unique timer ID for busy timer */

	void *ringback_timer; 			/* Void pointer for ringback vpb_timer */
	int ringback_timer_id;			/* unique timer ID for ringback timer */

	double lastgrunt;			/* time stamp (secs since epoc) of last grunt event */

	ast_mutex_t lock;			/* This one just protects bridge ptr below */
	vpb_bridge_t *bridge;

	int stopreads; 				/* Stop reading...*/

	pthread_t readthread;			/* For monitoring read channel. One per owned channel. */

	ast_mutex_t record_lock;		/* This one prevents reentering a record_buf block */
	ast_mutex_t play_lock;			/* This one prevents reentering a play_buf block */

	ast_mutex_t play_dtmf_lock;
	char play_dtmf[16];

	struct vpb_pvt *next;			/* Next channel in list */

} *iflist = NULL;

static struct ast_channel *vpb_new(struct vpb_pvt *i, int state, char *context);
static void *do_chanreads(void *pvt);

// Can't get vpb_bridge() working on v4pci without either a horrible
// high pitched feedback noise or bad hiss noise depending on gain settings
// Get asterisk to do the bridging
#define BAD_V4PCI_BRIDGE

// This one enables a half duplex bridge which may be required to prevent high pitched
// feedback when getting asterisk to do the bridging and when using certain gain settings.
//#define HALF_DUPLEX_BRIDGE

static int vpb_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
{
	struct vpb_pvt *p0 = (struct vpb_pvt *)c0->pvt->pvt;
	struct vpb_pvt *p1 = (struct vpb_pvt *)c1->pvt->pvt;
	int i, res;

	#ifdef BAD_V4PCI_BRIDGE
	if(p0->vpb_model==vpb_model_v4pci)
		return -2;
	#endif

	ast_mutex_lock(&p0->lock);
	ast_mutex_lock(&p1->lock);

	/* Bridge channels, check if we can.  I believe we always can, so find a slot.*/

	ast_mutex_lock(&bridge_lock); {
		for (i = 0; i < max_bridges; i++) 
			if (!bridges[i].inuse)
				break;
		if (i < max_bridges) {
			bridges[i].inuse = 1;
			bridges[i].endbridge = 0;
			bridges[i].flags = flags;
			bridges[i].rc = rc;
			bridges[i].fo = fo;
			bridges[i].c0 = c0;
			bridges[i].c1 = c1;
			ast_mutex_init(&bridges[i].lock);
			pthread_cond_init(&bridges[i].cond, NULL);
		} 	       
	} ast_mutex_unlock(&bridge_lock); 

	if (i == max_bridges) {
		ast_log(LOG_WARNING, "Failed to bridge %s and %s!\n", c0->name, c1->name);
		ast_mutex_unlock(&p0->lock);
		ast_mutex_unlock(&p1->lock);
		return -2;
	} else {
		/* Set bridge pointers. You don't want to take these locks while holding bridge lock.*/
		ast_mutex_lock(&p0->lock); {
			p0->bridge = &bridges[i];
		} ast_mutex_unlock(&p0->lock);

		ast_mutex_lock(&p1->lock); {
			p1->bridge = &bridges[i];
		} ast_mutex_unlock(&p1->lock);

		if (option_verbose>1) 
			ast_verbose(VERBOSE_PREFIX_2 "Bridging call entered with [%s, %s]\n", c0->name, c1->name);
	}

	#ifdef HALF_DUPLEX_BRIDGE

	if (option_verbose>1) 
		ast_verbose(VERBOSE_PREFIX_2 "Starting half-duplex bridge [%s, %s]\n", c0->name, c1->name);

	int dir = 0;

	memset(p0->buf, 0, sizeof p0->buf);
	memset(p1->buf, 0, sizeof p1->buf);

	vpb_record_buf_start(p0->handle, VPB_ALAW);
	vpb_record_buf_start(p1->handle, VPB_ALAW);

	vpb_play_buf_start(p0->handle, VPB_ALAW);
	vpb_play_buf_start(p1->handle, VPB_ALAW);

	while( !bridges[i].endbridge ) {
		struct vpb_pvt *from, *to;
		if(++dir%2) {
			from = p0;
			to = p1;
		} else {
			from = p1;
			to = p0;
		}
		vpb_record_buf_sync(from->handle, from->buf, VPB_SAMPLES);
		vpb_play_buf_sync(to->handle, from->buf, VPB_SAMPLES);
	}

	vpb_record_buf_finish(p0->handle);
	vpb_record_buf_finish(p1->handle);

	vpb_play_buf_finish(p0->handle);
	vpb_play_buf_finish(p1->handle);

	if (option_verbose>1) 
		ast_verbose(VERBOSE_PREFIX_2 "Finished half-duplex bridge [%s, %s]\n", c0->name, c1->name);

	res = VPB_OK;

	#else

	res = vpb_bridge(p0->handle, p1->handle, VPB_BRIDGE_ON, i+1 /* resource 1 & 2 only for V4PCI*/ );
	if (res == VPB_OK) {
		//pthread_cond_wait(&bridges[i].cond, &bridges[i].lock); /* Wait for condition signal. */
		while( !bridges[i].endbridge ) {};
		vpb_bridge(p0->handle, p1->handle, VPB_BRIDGE_OFF, i+1 /* resource 1 & 2 only for V4PCI*/ ); 
	}

	#endif

	ast_mutex_lock(&bridge_lock); {
		bridges[i].inuse = 0;
		ast_mutex_destroy(&bridges[i].lock);
		pthread_cond_destroy(&bridges[i].cond);	
	} ast_mutex_unlock(&bridge_lock); 

	p0->bridge = NULL;
	p1->bridge = NULL;


	if (option_verbose>1) 
		ast_verbose(VERBOSE_PREFIX_2 "Bridging call done with [%s, %s] => %d\n", c0->name, c1->name, res);

	ast_mutex_unlock(&p0->lock);
	ast_mutex_unlock(&p1->lock);
	return (res==VPB_OK)?0:-1;
}

static double get_time_in_ms()
{
	struct timeval tv;
	gettimeofday(&tv, NULL);
	return ((double)tv.tv_sec*1000)+((double)tv.tv_usec/1000);
}

// Caller ID can be located in different positions between the rings depending on your Telco
// Australian (Telstra) callerid starts 700ms after 1st ring and finishes 1.5s after first ring
// Use ANALYSE_CID to record rings and determine location of callerid
//#define ANALYSE_CID
#define RING_SKIP 600
#define CID_MSECS 1700

static void get_callerid(struct vpb_pvt *p)
{
	short buf[CID_MSECS*8]; // 8kHz sampling rate
	double cid_record_time;
	int rc;

	if(strcasecmp(p->callerid, "on")) {
		p->owner->callerid = strdup("unknown");
		return;
	}

	if( ast_mutex_trylock(&p->record_lock) == 0 ) {

		char callerid[AST_MAX_EXTENSION] = ""; 

		cid_record_time = get_time_in_ms();
		if (option_verbose>3) 
			ast_verbose(VERBOSE_PREFIX_4 "CID record - start\n");

		#ifdef ANALYSE_CID
		VPB_RECORD record_parms = { "", 8 * 1000 }; // record a couple of rings
		vpb_record_set(p->handle,&record_parms);
		ast_verbose(VERBOSE_PREFIX_4 "Recording debug CID sample to /tmp/cid.raw\n");
		vpb_record_file_sync(p->handle,"/tmp/cid.raw",VPB_LINEAR);
		rc = 1; // don't try to decode_cid
		#else	
		// Skip any trailing ringtone
		vpb_sleep(RING_SKIP);

		if (option_verbose>3) 
			ast_verbose(VERBOSE_PREFIX_4 "CID record - skipped %fms trailing ring\n",
				 get_time_in_ms() - cid_record_time);
		cid_record_time = get_time_in_ms();

		// Record bit between the rings which contains the callerid
		vpb_record_buf_start(p->handle, VPB_LINEAR);
		rc = vpb_record_buf_sync(p->handle, (char*)buf, sizeof(buf));
		vpb_record_buf_finish(p->handle);
		#endif

		if (option_verbose>3) 
			ast_verbose(VERBOSE_PREFIX_4 "CID record - recorded %fms between rings\n", 
				get_time_in_ms() - cid_record_time);

		ast_mutex_unlock(&p->record_lock);

		if( rc != VPB_OK ) {
			ast_log(LOG_ERROR, "Failed to record caller id sample on %s\n", p->dev );
			return;
		}

		// This decodes FSK 1200baud type callerid
		if ((rc=vpb_cid_decode(callerid, buf, CID_MSECS*8)) == VPB_OK ) {
			if(!*callerid) 
				strcpy(callerid,"undisclosed"); // blocked CID (eg caller used 1831)
		} else {
			ast_log(LOG_ERROR, "Failed to decode caller id on %s - %s\n", p->dev, vpb_strerror(rc) );
			strcpy(callerid,"unknown");
		}
		p->owner->callerid = strdup(callerid);

	} else 
		ast_log(LOG_ERROR, "Failed to set record mode for caller id on %s\n", p->dev );
}

// Terminate any tones we are presently playing
static void stoptone( int handle)
{
	int ret;
	VPB_EVENT je;
	while(vpb_playtone_state(handle)!=VPB_OK){
		vpb_tone_terminate(handle);
		ret = vpb_get_event_ch_async(handle,&je);
		if ((ret == VPB_OK)&&(je.type != VPB_DIALEND)){
			if (option_verbose > 3){
					ast_verbose(VERBOSE_PREFIX_4 "Stop tone collected a wrong event!!\n");
			}
			vpb_put_event(&je);
		}
		vpb_sleep(10);
	}
}

/* Safe vpb_playtone_async */
static int playtone( int handle, VPB_TONE *tone)
{
	int ret=VPB_OK;
	stoptone(handle);
	if (option_verbose > 3) 
		ast_verbose(VERBOSE_PREFIX_4 "[%02d]: Playing tone\n", handle);
	ret = vpb_playtone_async(handle, tone);
	return ret;
}

static inline int monitor_handle_owned(struct vpb_pvt *p, VPB_EVENT *e)
{
	struct ast_frame f = {AST_FRAME_CONTROL}; /* default is control, Clear rest. */
	int endbridge = 0;

	if (option_verbose > 3) 
		ast_verbose(VERBOSE_PREFIX_4 "%s: handle_owned: got event: [%d=>%d]\n",
			p->dev, e->type, e->data);

	f.src = type;
	switch (e->type) {
		case VPB_RING:
			if (p->mode == MODE_FXO) {
				f.subclass = AST_CONTROL_RING;
			} else
				f.frametype = -1; /* ignore ring on station port. */
			break;

		case VPB_RING_OFF:
			f.frametype = -1;
			break;

		case VPB_TIMEREXP:
			if (e->data == p->busy_timer_id) {
				playtone(p->handle,&Busytone);
				p->state = VPB_STATE_PLAYBUSY;
				vpb_timer_stop(p->busy_timer);
				vpb_timer_start(p->busy_timer);
				f.frametype = -1;
			} else if (e->data == p->ringback_timer_id) {
				playtone(p->handle, &Ringbacktone);
				vpb_timer_stop(p->ringback_timer);
				vpb_timer_start(p->ringback_timer);
				f.frametype = -1;
			} else {
				f.frametype = -1; /* Ignore. */
			}
			break;

		case VPB_DTMF:
			if (p->owner->_state == AST_STATE_UP) {
				f.frametype = AST_FRAME_DTMF;
				f.subclass = e->data;
			} else
				f.frametype = -1;
			break;

		case VPB_TONEDETECT:
			if (e->data == VPB_BUSY || e->data == VPB_BUSY_308 || e->data == VPB_BUSY_AUST ) {
				f.subclass = AST_CONTROL_HANGUP;
				if (p->owner->_state == AST_STATE_UP) {
					f.subclass = AST_CONTROL_HANGUP;
				}
				else {
					f.subclass = AST_CONTROL_BUSY;
				}
			} else if (e->data == VPB_GRUNT) {
				if( ( get_time_in_ms() - p->lastgrunt ) > gruntdetect_timeout ) {
					// Nothing heard on line for a very long time
					// Timeout connection
					if (option_verbose > 2) 
						ast_verbose(VERBOSE_PREFIX_3 "grunt timeout\n");
					ast_log(LOG_NOTICE,"%s: Line hangup due of lack of conversation\n",p->dev); 
					f.subclass = AST_CONTROL_HANGUP;
				} else {
					p->lastgrunt = get_time_in_ms();
					f.frametype = -1;
				}
			} else
				f.frametype = -1;
			break;

		case VPB_CALLEND:
			#ifdef DIAL_WITH_CALL_PROGRESS
			if (e->data == VPB_CALL_CONNECTED) 
				f.subclass = AST_CONTROL_ANSWER;
			else if (e->data == VPB_CALL_NO_DIAL_TONE || e->data == VPB_CALL_NO_RING_BACK)
				f.subclass =  AST_CONTROL_CONGESTION;
			else if (e->data == VPB_CALL_NO_ANSWER || e->data == VPB_CALL_BUSY)
				f.subclass = AST_CONTROL_BUSY;
			else if (e->data  == VPB_CALL_DISCONNECTED) 
				f.subclass = AST_CONTROL_HANGUP;
			#else
			ast_log(LOG_NOTICE,"%s: Got call progress callback but blind dialing \n", p->dev); 
			f.frametype = -1;
			#endif
			break;

		case VPB_STATION_OFFHOOK:
			f.subclass = AST_CONTROL_ANSWER;
			break;

		/* not sure why this was commented out */	  
		case VPB_DROP:
			if ((p->mode == MODE_FXO)&&(UseLoopDrop)){ /* ignore loop drop on stations */
				if (p->owner->_state == AST_STATE_UP) 
					f.subclass = AST_CONTROL_HANGUP;
				else
					f.frametype = -1;
			}
			break;
		/* */	  
		case VPB_STATION_ONHOOK:
			f.subclass = AST_CONTROL_HANGUP;
			break;

		case VPB_STATION_FLASH:
			f.subclass = AST_CONTROL_FLASH;
			break;

		// Called when dialing has finished and ringing starts
		// No indication that call has really been answered when using blind dialing
		case VPB_DIALEND:
			if (p->state < 5){
				f.subclass = AST_CONTROL_ANSWER;
				if (option_verbose > 1) 
					ast_verbose(VERBOSE_PREFIX_2 "%s: Dialend\n", p->dev);
			} else {
				f.frametype = -1;
			}
			break;

		case VPB_PLAY_UNDERFLOW:
			f.frametype = -1;
			vpb_reset_play_fifo_alarm(p->handle);
			break;

		case VPB_RECORD_OVERFLOW:
			f.frametype = -1;
			vpb_reset_record_fifo_alarm(p->handle);
			break;

		default:
			f.frametype = -1;
			break;
	}

	if (option_verbose > 3) 
		ast_verbose(VERBOSE_PREFIX_4 "%s: handle_owned: putting frame type[%d]subclass[%d], bridge=%p\n",
			p->dev, f.frametype, f.subclass, (void *)p->bridge);

	ast_mutex_lock(&p->lock); {
		if (p->bridge) { /* Check what happened, see if we need to report it. */
			switch (f.frametype) {
				case AST_FRAME_DTMF:
					if (!(p->bridge->c0 == p->owner && 
							(p->bridge->flags & AST_BRIDGE_DTMF_CHANNEL_0) ) &&
							!(p->bridge->c1 == p->owner && 
							(p->bridge->flags & AST_BRIDGE_DTMF_CHANNEL_1) )) 
						/* Kill bridge, this is interesting. */
						endbridge = 1;
					break;

				case AST_FRAME_CONTROL:
					if (!(p->bridge->flags & AST_BRIDGE_IGNORE_SIGS)) 
					#if 0
					if (f.subclass == AST_CONTROL_BUSY ||
					f.subclass == AST_CONTROL_CONGESTION ||
					f.subclass == AST_CONTROL_HANGUP ||
					f.subclass == AST_CONTROL_FLASH)
					#endif
						endbridge = 1;
					break;

				default:
					break;
			}
			if (endbridge) {
				if (p->bridge->fo)
					*p->bridge->fo = ast_frisolate(&f);
				if (p->bridge->rc)
					*p->bridge->rc = p->owner;

				ast_mutex_lock(&p->bridge->lock); {
					p->bridge->endbridge = 1;
					pthread_cond_signal(&p->bridge->cond);
				} ast_mutex_unlock(&p->bridge->lock); 	       		   
			}	  
		}
	} ast_mutex_unlock(&p->lock);

	if (endbridge) return 0;

	// Trylock used here to avoid deadlock that can occur if we
	// happen to be in here handling an event when hangup is called
	// Problem is that hangup holds p->owner->lock
	if (f.frametype >= 0 && f.frametype != AST_FRAME_NULL) {
		if (ast_mutex_trylock(&p->owner->lock)==0)  {
			ast_queue_frame(p->owner, &f);
			ast_mutex_unlock(&p->owner->lock);
		} else {
			ast_verbose("%s: handled_owned: Missed event %d/%d \n",
				p->dev,f.frametype, f.subclass);
		}
	}

	return 0;
}

static inline int monitor_handle_notowned(struct vpb_pvt *p, VPB_EVENT *e)
{
	char s[2] = {0};

	if (option_verbose > 3) {
		char str[VPB_MAX_STR];
		vpb_translate_event(e, str);
		ast_verbose(VERBOSE_PREFIX_4 "%s: handle_notowned: mode=%d, event[%d][%s]=[%d]\n",
			p->dev, p->mode, e->type,str, e->data);
	}

	switch(e->type) {
		case VPB_RING:
			if (p->mode == MODE_FXO) /* FXO port ring, start * */ {
				vpb_new(p, AST_STATE_RING, p->context);
				get_callerid(p);	/* Australian Caller ID only between 1st and 2nd ring */
			}
			break;

		case VPB_RING_OFF:
			break;

		case VPB_STATION_OFFHOOK:
			if (p->mode == MODE_IMMEDIATE) 
				vpb_new(p,AST_STATE_RING, p->context);
			else {
				ast_verbose(VERBOSE_PREFIX_4 "%s: handle_notowned: playing dialtone\n",p->dev);
				playtone(p->handle, &Dialtone);
				p->wantdtmf = 1;
				p->ext[0] = 0;	/* Just to be sure & paranoid.*/
				p->state=VPB_STATE_PLAYDIAL;
			}
			break;

		case VPB_DIALEND:
			if (p->mode == MODE_DIALTONE){
				if (p->state == VPB_STATE_PLAYDIAL) {
					playtone(p->handle, &Dialtone);
					p->wantdtmf = 1;
					p->ext[0] = 0;	// Just to be sure & paranoid.
				}
				/* These are not needed as they have timers to restart them
				else if (p->state == VPB_STATE_PLAYBUSY) {
					playtone(p->handle, &Busytone);
					p->wantdtmf = 1;
					p->ext[0] = 0;	// Just to be sure & paranoid.
				}
				else if (p->state == VPB_STATE_PLAYRING) {
					playtone(p->handle, &Ringbacktone);
					p->wantdtmf = 1;
					p->ext[0] = 0;	// Just to be sure & paranoid.
				}
				*/
			} else {
				ast_verbose(VERBOSE_PREFIX_4 "%s: handle_notowned: Got a DIALEND when not really expected\n",p->dev);
			}
			break;

		case VPB_STATION_ONHOOK:	/* clear ext */
			stoptone(p->handle);
			p->wantdtmf = 1 ;
			p->ext[0] = 0;
			p->state=VPB_STATE_ONHOOK;
			break;

		case VPB_DTMF:
			if (p->state == VPB_STATE_ONHOOK){
				/* DTMF's being passed while on-hook maybe Caller ID */
				break;
			}
			if (p->wantdtmf == 1) {
				stoptone(p->handle);
				p->wantdtmf = 0;
			}
			p->state=VPB_STATE_GETDTMF;
			s[0] = e->data;
			strcat(p->ext, s);
			if (ast_exists_extension(NULL, p->context, p->ext, 1, p->callerid)){
				vpb_new(p,AST_STATE_RING, p->context);
			} else if (!ast_canmatch_extension(NULL, p->context, p->ext, 1, p->callerid)){
				if (ast_exists_extension(NULL, "default", p->ext, 1, p->callerid)) {
					vpb_new(p,AST_STATE_RING, "default");	      
				} else if (!ast_canmatch_extension(NULL, "default", p->ext, 1, p->callerid)) {
					if (option_verbose > 3) {
						ast_verbose(VERBOSE_PREFIX_4 "%s: handle_notowned: can't match anything in %s or default\n",
							 p->dev, p->context);
					}
					playtone(p->handle, &Busytone);
					vpb_timer_stop(p->busy_timer);
					vpb_timer_start(p->busy_timer);
					p->state = VPB_STATE_PLAYBUSY;
				}
			}
			break;

		default:
			/* Ignore.*/
			break;
	}

	if (option_verbose > 3) 
		ast_verbose(VERBOSE_PREFIX_4 "%s: handle_notowned: mode=%d, [%d=>%d]\n",
			p->dev, p->mode, e->type, e->data);

	return 0;
}

static void *do_monitor(void *unused)
{

	/* Monitor thread, doesn't die until explicitly killed. */

	if (option_verbose > 1) 
		ast_verbose(VERBOSE_PREFIX_2 "Starting vpb monitor thread[%ld]\n",
	pthread_self());

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

	for(;;) {
		VPB_EVENT e;
		VPB_EVENT je;
		char str[VPB_MAX_STR];
		struct vpb_pvt *p;

		/*
		if (option_verbose > 3)
		     ast_verbose(VERBOSE_PREFIX_4 "Monitor waiting for event\n");
		*/

		int res = vpb_get_event_sync(&e, VPB_WAIT_TIMEOUT);
		if( (res==VPB_NO_EVENTS) || (res==VPB_TIME_OUT) ){
			/*
			if (option_verbose > 3){
				if (res ==  VPB_NO_EVENTS){
					ast_verbose(VERBOSE_PREFIX_4 "No events....\n");
				} else {
					ast_verbose(VERBOSE_PREFIX_4 "No events, timed out....\n");
				}
			}
			*/
			continue;
		}

		if (res != VPB_OK) {
			ast_log(LOG_ERROR,"Monitor get event error %s\n", vpb_strerror(res) );
			ast_verbose("Monitor get event error %s\n", vpb_strerror(res) );
			continue;
		}

		str[0] = 0;

		p = NULL;

		ast_mutex_lock(&monlock); {
			vpb_translate_event(&e, str);

			if (e.type == VPB_NULL_EVENT) {
				if (option_verbose > 3)
					ast_verbose(VERBOSE_PREFIX_4 "Monitor got null event\n");
				goto done; /* Nothing to do, just a wakeup call.*/
			}
			if (strlen(str)>1){
				str[(strlen(str)-1)]='\0';
			}

			ast_mutex_lock(&iflock); {
				p = iflist;
				while (p && p->handle != e.handle)
					p = p->next;
			} ast_mutex_unlock(&iflock);

			if (p && (option_verbose > 3))
				ast_verbose(VERBOSE_PREFIX_4 "%s: Event [%d=>%s] \n", 
					p ? p->dev : "null", e.type, str );
			done: (void)0;

		} ast_mutex_unlock(&monlock); 

		if (!p) {
			if (e.type != VPB_NULL_EVENT){
				ast_log(LOG_WARNING, "Got event [%s][%d], no matching iface!\n", str,e.type);    
				if (option_verbose > 3){
					ast_verbose(VERBOSE_PREFIX_4 "vpb/ERR: No interface for Event [%d=>%s] \n",e.type,str );
				}
			}
			continue;
		} 

		/* flush the event from the channel event Q */
		vpb_get_event_ch_async(e.handle,&je);
		if (option_verbose > 3){
			vpb_translate_event(&je, str);
			ast_verbose( VERBOSE_PREFIX_4 "%s: Flushing event [%d]=>%s\n",p->dev,je.type,str);
		}

		/* Check for ownership and locks */
		if ((p->owner)&&(!p->golock)){
			/* Need to get owner lock */
			/* Safely grab both p->lock and p->owner->lock so that there
			cannot be a race with something from the other side */
			/*
			ast_mutex_lock(&p->lock);
			while(ast_mutex_trylock(&p->owner->lock)) {
				ast_mutex_unlock(&p->lock);
				usleep(1);
				ast_mutex_lock(&p->lock);
				if (!p->owner)
					break;
			}
			if (p->owner)
				p->golock=1;
			*/
		}
		/* Two scenarios: Are you owned or not. */
		if (p->owner) {
			monitor_handle_owned(p, &e);
		} else {
			monitor_handle_notowned(p, &e);
		}
		if ((!p->owner)&&(p->golock)){
			ast_mutex_unlock(&p->owner->lock);
			ast_mutex_unlock(&p->lock);
		}

	}

	return NULL;
}

static int restart_monitor(void)
{
	int error = 0;

	/* If we're supposed to be stopped -- stay stopped */
	if (mthreadactive == -2)
		return 0;

	if (option_verbose > 3)
		ast_verbose(VERBOSE_PREFIX_4 "Restarting monitor\n");

	ast_mutex_lock(&monlock); {
		if (monitor_thread == pthread_self()) {
			ast_log(LOG_WARNING, "Cannot kill myself\n");
			error = -1;
			if (option_verbose > 3)
				ast_verbose(VERBOSE_PREFIX_4 "Monitor trying to kill monitor\n");
			goto done;
		}
		if (mthreadactive != -1) {
			/* Why do other drivers kill the thread? No need says I, simply awake thread with event. */
			VPB_EVENT e;
			e.handle = 0;
			e.type = VPB_NULL_EVENT;
			e.data = 0;

			if (option_verbose > 3)
				ast_verbose(VERBOSE_PREFIX_4 "Trying to reawake monitor\n");

			vpb_put_event(&e);
		} else {
			/* Start a new monitor */
			int pid = pthread_create(&monitor_thread, NULL, do_monitor, NULL); 
			if (option_verbose > 3)
				ast_verbose(VERBOSE_PREFIX_4 "Created new monitor thread %d\n",pid);
			if (pid < 0) {
				ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
				error = -1;
				goto done;
			} else
				mthreadactive = 0; /* Started the thread!*/
		}
		done: (void)0;
	} ast_mutex_unlock(&monlock);

	if (option_verbose > 3)
		ast_verbose(VERBOSE_PREFIX_4 "Monitor restarted\n");

	return error;
}

// Per board config that must be called after vpb_open()
static void mkbrd(vpb_model_t model, int echo_cancel)
{
	if(!bridges) {
		if(model==vpb_model_v4pci) 
			max_bridges = MAX_BRIDGES_V4PCI;
		bridges = (vpb_bridge_t *)malloc(max_bridges * sizeof(vpb_bridge_t) );
		if(!bridges) 
			ast_log(LOG_ERROR, "Failed to initialize bridges\n");
		else 
			memset(bridges,0,max_bridges * sizeof(vpb_bridge_t));
	}
	if(!echo_cancel) {
		if (model==vpb_model_v4pci) {
			vpb_echo_canc_disable();
			ast_log(LOG_NOTICE, "Voicetronix echo cancellation OFF\n");
		} 
		else {
		/* need to it port by port for OpenSwitch*/
		}
	} else {
		if (model==vpb_model_v4pci) {
			vpb_echo_canc_enable();
			ast_log(LOG_NOTICE, "Voicetronix echo cancellation ON\n");
		}
		else {
		/* need to it port by port for OpenSwitch*/
		}
	}
}

struct vpb_pvt *mkif(int board, int channel, int mode, float txgain, float rxgain,
			 float txswgain, float rxswgain, int bal1, int bal2, int bal3,
			 char * callerid, int echo_cancel, int group )
{
	struct vpb_pvt *tmp;
	char buf[64];

	tmp = (struct vpb_pvt *)calloc(1, sizeof *tmp);

	if (!tmp)
		return NULL;