when building a version string for a developer branch, include the base branch in...

[asterisk-bristuff.git] / channels / chan_phone.c

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Generic Linux Telephony Interface driver
 *
 * \author Mark Spencer <markster@digium.com>
 * 
 * \ingroup channel_drivers
 */

/*** MODULEINFO
        <depend>ixjuser</depend>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include <stdio.h>
#include <string.h>
#include <ctype.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 <signal.h>
#include <linux/telephony.h>
/* Still use some IXJ specific stuff */
#include <linux/version.h>
#include <linux/ixjuser.h>

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/utils.h"
#include "asterisk/callerid.h"
#include "asterisk/causes.h"
#include "asterisk/stringfields.h"
#include "asterisk/musiconhold.h"

#include "DialTone.h"

#ifdef QTI_PHONEJACK_TJ_PCI     /* check for the newer quicknet driver v.3.1.0 which has this symbol */
#define QNDRV_VER 310
#else
#define QNDRV_VER 100
#endif

#if QNDRV_VER > 100
#ifdef __linux__
#define IXJ_PHONE_RING_START(x) ioctl(p->fd, PHONE_RING_START, &x);
#else /* FreeBSD and others */
#define IXJ_PHONE_RING_START(x) ioctl(p->fd, PHONE_RING_START, x);
#endif /* __linux__ */
#else   /* older driver */
#define IXJ_PHONE_RING_START(x) ioctl(p->fd, PHONE_RING_START, &x);
#endif

#define DEFAULT_CALLER_ID "Unknown"
#define PHONE_MAX_BUF 480
#define DEFAULT_GAIN 0x100

static const char tdesc[] = "Standard Linux Telephony API Driver";
static const char config[] = "phone.conf";

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

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

static int echocancel = AEC_OFF;

static int silencesupression = 0;

static int prefformat = AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW;

/* Protect the interface list (of phone_pvt's) */
AST_MUTEX_DEFINE_STATIC(iflock);

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

/* Boolean value whether the monitoring thread shall continue. */
static unsigned int monitor;
   
/* This is the thread for the monitor which checks for input on the channels
   which are not currently in use.  */
static pthread_t monitor_thread = AST_PTHREADT_NULL;

static int restart_monitor(void);

/* The private structures of the Phone Jack channels are linked for
   selecting outgoing channels */
   
#define MODE_DIALTONE   1
#define MODE_IMMEDIATE  2
#define MODE_FXO        3
#define MODE_FXS        4
#define MODE_SIGMA      5

static struct phone_pvt {
        int fd;                                                 /* Raw file descriptor for this device */
        struct ast_channel *owner;              /* Channel we belong to, possibly NULL */
        int mode;                                               /* Is this in the  */
        int lastformat;                                 /* Last output format */
        int lastinput;                                  /* Last input format */
        int ministate;                                  /* Miniature state, for dialtone mode */
        char dev[256];                                  /* Device name */
        struct phone_pvt *next;                 /* Next channel in list */
        struct ast_frame fr;                    /* Frame */
        char offset[AST_FRIENDLY_OFFSET];
        char buf[PHONE_MAX_BUF];                                        /* Static buffer for reading frames */
        int obuflen;
        int dialtone;
        int txgain, rxgain;             /* gain control for playing, recording  */
                                                                        /* 0x100 - 1.0, 0x200 - 2.0, 0x80 - 0.5 */
        int cpt;                                                /* Call Progress Tone playing? */
        int silencesupression;
        char context[AST_MAX_EXTENSION];
        char obuf[PHONE_MAX_BUF * 2];
        char ext[AST_MAX_EXTENSION];
        char language[MAX_LANGUAGE];
        char cid_num[AST_MAX_EXTENSION];
        char cid_name[AST_MAX_EXTENSION];
} *iflist = NULL;

static char cid_num[AST_MAX_EXTENSION];
static char cid_name[AST_MAX_EXTENSION];

static struct ast_channel *phone_request(const char *type, int format, void *data, int *cause);
static int phone_digit_begin(struct ast_channel *ast, char digit);
static int phone_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
static int phone_call(struct ast_channel *ast, char *dest, int timeout);
static int phone_hangup(struct ast_channel *ast);
static int phone_answer(struct ast_channel *ast);
static struct ast_frame *phone_read(struct ast_channel *ast);
static int phone_write(struct ast_channel *ast, struct ast_frame *frame);
static struct ast_frame *phone_exception(struct ast_channel *ast);
static int phone_send_text(struct ast_channel *ast, const char *text);
static int phone_fixup(struct ast_channel *old, struct ast_channel *new);
static int phone_indicate(struct ast_channel *chan, int condition, const void *data, size_t datalen);

static const struct ast_channel_tech phone_tech = {
        .type = "Phone",
        .description = tdesc,
        .capabilities = AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW,
        .requester = phone_request,
        .send_digit_begin = phone_digit_begin,
        .send_digit_end = phone_digit_end,
        .call = phone_call,
        .hangup = phone_hangup,
        .answer = phone_answer,
        .read = phone_read,
        .write = phone_write,
        .exception = phone_exception,
        .indicate = phone_indicate,
        .fixup = phone_fixup
};

static struct ast_channel_tech phone_tech_fxs = {
        .type = "Phone",
        .description = tdesc,
        .requester = phone_request,
        .send_digit_begin = phone_digit_begin,
        .send_digit_end = phone_digit_end,
        .call = phone_call,
        .hangup = phone_hangup,
        .answer = phone_answer,
        .read = phone_read,
        .write = phone_write,
        .exception = phone_exception,
        .write_video = phone_write,
        .send_text = phone_send_text,
        .indicate = phone_indicate,
        .fixup = phone_fixup
};

static struct ast_channel_tech *cur_tech;

static int phone_indicate(struct ast_channel *chan, int condition, const void *data, size_t datalen)
{
        struct phone_pvt *p = chan->tech_pvt;
        int res=-1;
        ast_log(LOG_DEBUG, "Requested indication %d on channel %s\n", condition, chan->name);
        switch(condition) {
                case AST_CONTROL_FLASH:
                        ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_ON_HOOK);
                        usleep(320000);
                        ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_OFF_HOOK);
                        p->lastformat = -1;
                        res = 0;
                        break;
                case AST_CONTROL_HOLD:
                        ast_moh_start(chan, data, NULL);
                        break;
                case AST_CONTROL_UNHOLD:
                        ast_moh_stop(chan);
                        break;
                default:
                        ast_log(LOG_WARNING, "Condition %d is not supported on channel %s\n", condition, chan->name);
        }
        return res;
}

static int phone_fixup(struct ast_channel *old, struct ast_channel *new)
{
        struct phone_pvt *pvt = old->tech_pvt;
        if (pvt && pvt->owner == old)
                pvt->owner = new;
        return 0;
}

static int phone_digit_begin(struct ast_channel *chan, char digit)
{
        /* XXX Modify this callback to let Asterisk support controlling the length of DTMF */
        return 0;
}

static int phone_digit_end(struct ast_channel *ast, char digit, unsigned int duration)
{
        struct phone_pvt *p;
        int outdigit;
        p = ast->tech_pvt;
        ast_log(LOG_DEBUG, "Dialed %c\n", digit);
        switch(digit) {
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
                outdigit = digit - '0';
                break;
        case '*':
                outdigit = 11;
                break;
        case '#':
                outdigit = 12;
                break;
        case 'f':       /*flash*/
        case 'F':
                ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_ON_HOOK);
                usleep(320000);
                ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_OFF_HOOK);
                p->lastformat = -1;
                return 0;
        default:
                ast_log(LOG_WARNING, "Unknown digit '%c'\n", digit);
                return -1;
        }
        ast_log(LOG_DEBUG, "Dialed %d\n", outdigit);
        ioctl(p->fd, PHONE_PLAY_TONE, outdigit);
        p->lastformat = -1;
        return 0;
}

static int phone_call(struct ast_channel *ast, char *dest, int timeout)
{
        struct phone_pvt *p;

        PHONE_CID cid;
        time_t UtcTime;
        struct tm tm;
        int start;

        time(&UtcTime);
        localtime_r(&UtcTime,&tm);

        memset(&cid, 0, sizeof(PHONE_CID));
        if(&tm != NULL) {
                snprintf(cid.month, sizeof(cid.month), "%02d",(tm.tm_mon + 1));
                snprintf(cid.day, sizeof(cid.day),     "%02d", tm.tm_mday);
                snprintf(cid.hour, sizeof(cid.hour),   "%02d", tm.tm_hour);
                snprintf(cid.min, sizeof(cid.min),     "%02d", tm.tm_min);
        }
        /* the standard format of ast->callerid is:  "name" <number>, but not always complete */
        if (ast_strlen_zero(ast->cid.cid_name))
                strcpy(cid.name, DEFAULT_CALLER_ID);
        else
                ast_copy_string(cid.name, ast->cid.cid_name, sizeof(cid.name));

        if (ast->cid.cid_num) 
                ast_copy_string(cid.number, ast->cid.cid_num, sizeof(cid.number));

        p = ast->tech_pvt;

        if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
                ast_log(LOG_WARNING, "phone_call called on %s, neither down nor reserved\n", ast->name);
                return -1;
        }
        if (option_debug)
                ast_log(LOG_DEBUG, "Ringing %s on %s (%d)\n", dest, ast->name, ast->fds[0]);

        start = IXJ_PHONE_RING_START(cid);
        if (start == -1)
                return -1;
        
        if (p->mode == MODE_FXS) {
                char *digit = strchr(dest, '/');
                if (digit)
                {
                  digit++;
                  while (*digit)
                    phone_digit_end(ast, *digit++, 0);
                }
        }
 
        ast_setstate(ast, AST_STATE_RINGING);
        ast_queue_control(ast, AST_CONTROL_RINGING);
        return 0;
}

static int phone_hangup(struct ast_channel *ast)
{
        struct phone_pvt *p;
        p = ast->tech_pvt;
        if (option_debug)
                ast_log(LOG_DEBUG, "phone_hangup(%s)\n", ast->name);
        if (!ast->tech_pvt) {
                ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
                return 0;
        }
        /* XXX Is there anything we can do to really hang up except stop recording? */
        ast_setstate(ast, AST_STATE_DOWN);
        if (ioctl(p->fd, PHONE_REC_STOP))
                ast_log(LOG_WARNING, "Failed to stop recording\n");
        if (ioctl(p->fd, PHONE_PLAY_STOP))
                ast_log(LOG_WARNING, "Failed to stop playing\n");
        if (ioctl(p->fd, PHONE_RING_STOP))
                ast_log(LOG_WARNING, "Failed to stop ringing\n");
        if (ioctl(p->fd, PHONE_CPT_STOP))
                ast_log(LOG_WARNING, "Failed to stop sounds\n");

        /* If it's an FXO, hang them up */
        if (p->mode == MODE_FXO) {
                if (ioctl(p->fd, PHONE_PSTN_SET_STATE, PSTN_ON_HOOK)) 
                        ast_log(LOG_DEBUG, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n",ast->name, strerror(errno));
        }

        /* If they're off hook, give a busy signal */
        if (ioctl(p->fd, PHONE_HOOKSTATE)) {
                if (option_debug)
                        ast_log(LOG_DEBUG, "Got hunghup, giving busy signal\n");
                ioctl(p->fd, PHONE_BUSY);
                p->cpt = 1;
        }
        p->lastformat = -1;
        p->lastinput = -1;
        p->ministate = 0;
        p->obuflen = 0;
        p->dialtone = 0;
        memset(p->ext, 0, sizeof(p->ext));
        ((struct phone_pvt *)(ast->tech_pvt))->owner = NULL;
        ast_module_unref(ast_module_info->self);
        if (option_verbose > 2) 
                ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
        ast->tech_pvt = NULL;
        ast_setstate(ast, AST_STATE_DOWN);
        restart_monitor();
        return 0;
}

static int phone_setup(struct ast_channel *ast)
{
        struct phone_pvt *p;
        p = ast->tech_pvt;
        ioctl(p->fd, PHONE_CPT_STOP);
        /* Nothing to answering really, just start recording */
        if (ast->rawreadformat == AST_FORMAT_G723_1) {
                /* Prefer g723 */
                ioctl(p->fd, PHONE_REC_STOP);
                if (p->lastinput != AST_FORMAT_G723_1) {
                        p->lastinput = AST_FORMAT_G723_1;
                        if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
                                ast_log(LOG_WARNING, "Failed to set codec to g723.1\n");
                                return -1;
                        }
                }
        } else if (ast->rawreadformat == AST_FORMAT_SLINEAR) {
                ioctl(p->fd, PHONE_REC_STOP);
                if (p->lastinput != AST_FORMAT_SLINEAR) {
                        p->lastinput = AST_FORMAT_SLINEAR;
                        if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
                                ast_log(LOG_WARNING, "Failed to set codec to signed linear 16\n");
                                return -1;
                        }
                }
        } else if (ast->rawreadformat == AST_FORMAT_ULAW) {
                ioctl(p->fd, PHONE_REC_STOP);
                if (p->lastinput != AST_FORMAT_ULAW) {
                        p->lastinput = AST_FORMAT_ULAW;
                        if (ioctl(p->fd, PHONE_REC_CODEC, ULAW)) {
                                ast_log(LOG_WARNING, "Failed to set codec to uLaw\n");
                                return -1;
                        }
                }
        } else if (p->mode == MODE_FXS) {
                ioctl(p->fd, PHONE_REC_STOP);
                if (p->lastinput != ast->rawreadformat) {
                        p->lastinput = ast->rawreadformat;
                        if (ioctl(p->fd, PHONE_REC_CODEC, ast->rawreadformat)) {
                                ast_log(LOG_WARNING, "Failed to set codec to %d\n", 
                                        ast->rawreadformat);
                                return -1;
                        }
                }
        } else {
                ast_log(LOG_WARNING, "Can't do format %s\n", ast_getformatname(ast->rawreadformat));
                return -1;
        }
        if (ioctl(p->fd, PHONE_REC_START)) {
                ast_log(LOG_WARNING, "Failed to start recording\n");
                return -1;
        }
        /* set the DTMF times (the default is too short) */
        ioctl(p->fd, PHONE_SET_TONE_ON_TIME, 300);
        ioctl(p->fd, PHONE_SET_TONE_OFF_TIME, 200);
        return 0;
}

static int phone_answer(struct ast_channel *ast)
{
        struct phone_pvt *p;
        p = ast->tech_pvt;
        /* In case it's a LineJack, take it off hook */
        if (p->mode == MODE_FXO) {
                if (ioctl(p->fd, PHONE_PSTN_SET_STATE, PSTN_OFF_HOOK)) 
                        ast_log(LOG_DEBUG, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n", ast->name, strerror(errno));
                else
                        ast_log(LOG_DEBUG, "Took linejack off hook\n");
        }
        phone_setup(ast);
        if (option_debug)
                ast_log(LOG_DEBUG, "phone_answer(%s)\n", ast->name);
        ast->rings = 0;
        ast_setstate(ast, AST_STATE_UP);
        return 0;
}

#if 0
static char phone_2digit(char c)
{
        if (c == 12)
                return '#';
        else if (c == 11)
                return '*';
        else if ((c < 10) && (c >= 0))
                return '0' + c - 1;
        else
                return '?';
}
#endif

static struct ast_frame  *phone_exception(struct ast_channel *ast)
{
        int res;
        union telephony_exception phonee;
        struct phone_pvt *p = ast->tech_pvt;
        char digit;

        /* Some nice norms */
        p->fr.datalen = 0;
        p->fr.samples = 0;
        p->fr.data =  NULL;
        p->fr.src = "Phone";
        p->fr.offset = 0;
        p->fr.mallocd=0;
        p->fr.delivery = ast_tv(0,0);
        
        phonee.bytes = ioctl(p->fd, PHONE_EXCEPTION);
        if (phonee.bits.dtmf_ready)  {
                if (option_debug)
                        ast_log(LOG_DEBUG, "phone_exception(): DTMF\n");
        
                /* We've got a digit -- Just handle this nicely and easily */
                digit =  ioctl(p->fd, PHONE_GET_DTMF_ASCII);
                p->fr.subclass = digit;
                p->fr.frametype = AST_FRAME_DTMF;
                return &p->fr;
        }
        if (phonee.bits.hookstate) {
                if (option_debug)
                        ast_log(LOG_DEBUG, "Hookstate changed\n");
                res = ioctl(p->fd, PHONE_HOOKSTATE);
                /* See if we've gone on hook, if so, notify by returning NULL */
                if (option_debug)
                        ast_log(LOG_DEBUG, "New hookstate: %d\n", res);
                if (!res && (p->mode != MODE_FXO))
                        return NULL;
                else {
                        if (ast->_state == AST_STATE_RINGING) {
                                /* They've picked up the phone */
                                p->fr.frametype = AST_FRAME_CONTROL;
                                p->fr.subclass = AST_CONTROL_ANSWER;
                                phone_setup(ast);
                                ast_setstate(ast, AST_STATE_UP);
                                return &p->fr;
                        }  else 
                                ast_log(LOG_WARNING, "Got off hook in weird state %d\n", ast->_state);
                }
        }
#if 1
        if (phonee.bits.pstn_ring)
                ast_verbose("Unit is ringing\n");
        if (phonee.bits.caller_id) {
                ast_verbose("We have caller ID\n");
        }
        if (phonee.bits.pstn_wink)
                ast_verbose("Detected Wink\n");
#endif
        /* Strange -- nothing there.. */
        p->fr.frametype = AST_FRAME_NULL;
        p->fr.subclass = 0;
        return &p->fr;
}

static struct ast_frame  *phone_read(struct ast_channel *ast)
{
        int res;
        struct phone_pvt *p = ast->tech_pvt;
        

        /* Some nice norms */
        p->fr.datalen = 0;
        p->fr.samples = 0;
        p->fr.data =  NULL;
        p->fr.src = "Phone";
        p->fr.offset = 0;
        p->fr.mallocd=0;
        p->fr.delivery = ast_tv(0,0);

        /* Try to read some data... */
        CHECK_BLOCKING(ast);
        res = read(p->fd, p->buf, PHONE_MAX_BUF);
        ast_clear_flag(ast, AST_FLAG_BLOCKING);
        if (res < 0) {
#if 0
                if (errno == EAGAIN) {
                        ast_log(LOG_WARNING, "Null frame received\n");
                        p->fr.frametype = AST_FRAME_NULL;
                        p->fr.subclass = 0;
                        return &p->fr;
                }
#endif
                ast_log(LOG_WARNING, "Error reading: %s\n", strerror(errno));
                return NULL;
        }
        p->fr.data = p->buf;
        if (p->mode != MODE_FXS)
        switch(p->buf[0] & 0x3) {
        case '0':
        case '1':
                /* Normal */
                break;
        case '2':
        case '3':
                /* VAD/CNG, only send two words */
                res = 4;
                break;
        }
        p->fr.samples = 240;
        p->fr.datalen = res;
        p->fr.frametype = p->lastinput <= AST_FORMAT_MAX_AUDIO ?
                          AST_FRAME_VOICE : 
                          p->lastinput <= AST_FORMAT_PNG ? AST_FRAME_IMAGE 
                          : AST_FRAME_VIDEO;
        p->fr.subclass = p->lastinput;
        p->fr.offset = AST_FRIENDLY_OFFSET;
        /* Byteswap from little-endian to native-endian */
        if (p->fr.subclass == AST_FORMAT_SLINEAR)
                ast_frame_byteswap_le(&p->fr);
        return &p->fr;
}

static int phone_write_buf(struct phone_pvt *p, const char *buf, int len, int frlen, int swap)
{
        int res;
        /* Store as much of the buffer as we can, then write fixed frames */
        int space = sizeof(p->obuf) - p->obuflen;
        /* Make sure we have enough buffer space to store the frame */
        if (space < len)
                len = space;
        if (swap)
                ast_swapcopy_samples(p->obuf+p->obuflen, buf, len/2);
        else
                memcpy(p->obuf + p->obuflen, buf, len);
        p->obuflen += len;
        while(p->obuflen > frlen) {
                res = write(p->fd, p->obuf, frlen);
                if (res != frlen) {
                        if (res < 1) {
/*
 * Card is in non-blocking mode now and it works well now, but there are
 * lot of messages like this. So, this message is temporarily disabled.
 */
                                return 0;
                        } else {
                                ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frlen);
                        }
                }
                p->obuflen -= frlen;
                /* Move memory if necessary */
                if (p->obuflen) 
                        memmove(p->obuf, p->obuf + frlen, p->obuflen);
        }
        return len;
}

static int phone_send_text(struct ast_channel *ast, const char *text)
{
    int length = strlen(text);
    return phone_write_buf(ast->tech_pvt, text, length, length, 0) == 
           length ? 0 : -1;
}

static int phone_write(struct ast_channel *ast, struct ast_frame *frame)
{
        struct phone_pvt *p = ast->tech_pvt;
        int res;
        int maxfr=0;
        char *pos;
        int sofar;
        int expected;
        int codecset = 0;
        char tmpbuf[4];
        /* Write a frame of (presumably voice) data */
        if (frame->frametype != AST_FRAME_VOICE && p->mode != MODE_FXS) {
                if (frame->frametype != AST_FRAME_IMAGE)
                        ast_log(LOG_WARNING, "Don't know what to do with  frame type '%d'\n", frame->frametype);
                return 0;
        }
        if (!(frame->subclass &
                (AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW)) && 
            p->mode != MODE_FXS) {
                ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
                return -1;
        }
#if 0
        /* If we're not in up mode, go into up mode now */
        if (ast->_state != AST_STATE_UP) {
                ast_setstate(ast, AST_STATE_UP);
                phone_setup(ast);
        }
#else
        if (ast->_state != AST_STATE_UP) {
                /* Don't try tos end audio on-hook */
                return 0;
        }
#endif  
        if (frame->subclass == AST_FORMAT_G723_1) {
                if (p->lastformat != AST_FORMAT_G723_1) {
                        ioctl(p->fd, PHONE_PLAY_STOP);
                        ioctl(p->fd, PHONE_REC_STOP);
                        if (ioctl(p->fd, PHONE_PLAY_CODEC, G723_63)) {
                                ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
                                return -1;
                        }
                        if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
                                ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
                                return -1;
                        }
                        p->lastformat = AST_FORMAT_G723_1;
                        p->lastinput = AST_FORMAT_G723_1;
                        /* Reset output buffer */
                        p->obuflen = 0;
                        codecset = 1;
                }
                if (frame->datalen > 24) {
                        ast_log(LOG_WARNING, "Frame size too large for G.723.1 (%d bytes)\n", frame->datalen);
                        return -1;
                }
                maxfr = 24;
        } else if (frame->subclass == AST_FORMAT_SLINEAR) {
                if (p->lastformat != AST_FORMAT_SLINEAR) {
                        ioctl(p->fd, PHONE_PLAY_STOP);
                        ioctl(p->fd, PHONE_REC_STOP);
                        if (ioctl(p->fd, PHONE_PLAY_CODEC, LINEAR16)) {
                                ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
                                return -1;
                        }
                        if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
                                ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
                                return -1;
                        }
                        p->lastformat = AST_FORMAT_SLINEAR;
                        p->lastinput = AST_FORMAT_SLINEAR;
                        codecset = 1;
                        /* Reset output buffer */
                        p->obuflen = 0;
                }
                maxfr = 480;
        } else if (frame->subclass == AST_FORMAT_ULAW) {
                if (p->lastformat != AST_FORMAT_ULAW) {
                        ioctl(p->fd, PHONE_PLAY_STOP);
                        ioctl(p->fd, PHONE_REC_STOP);
                        if (ioctl(p->fd, PHONE_PLAY_CODEC, ULAW)) {
                                ast_log(LOG_WARNING, "Unable to set uLaw mode\n");
                                return -1;
                        }
                        if (ioctl(p->fd, PHONE_REC_CODEC, ULAW)) {
                                ast_log(LOG_WARNING, "Unable to set uLaw mode\n");
                                return -1;
                        }
                        p->lastformat = AST_FORMAT_ULAW;
                        p->lastinput = AST_FORMAT_ULAW;
                        codecset = 1;
                        /* Reset output buffer */
                        p->obuflen = 0;
                }
                maxfr = 240;
        } else {
                if (p->lastformat != frame->subclass) {
                        ioctl(p->fd, PHONE_PLAY_STOP);
                        ioctl(p->fd, PHONE_REC_STOP);
                        if (ioctl(p->fd, PHONE_PLAY_CODEC, frame->subclass)) {
                                ast_log(LOG_WARNING, "Unable to set %d mode\n",
                                        frame->subclass);
                                return -1;
                        }
                        if (ioctl(p->fd, PHONE_REC_CODEC, frame->subclass)) {
                                ast_log(LOG_WARNING, "Unable to set %d mode\n",
                                        frame->subclass);
                                return -1;
                        }
                        p->lastformat = frame->subclass;
                        p->lastinput = frame->subclass;
                        codecset = 1;
                        /* Reset output buffer */
                        p->obuflen = 0;
                }
                maxfr = 480;
        }
        if (codecset) {
                ioctl(p->fd, PHONE_REC_DEPTH, 3);
                ioctl(p->fd, PHONE_PLAY_DEPTH, 3);
                if (ioctl(p->fd, PHONE_PLAY_START)) {
                        ast_log(LOG_WARNING, "Failed to start playback\n");
                        return -1;
                }
                if (ioctl(p->fd, PHONE_REC_START)) {
                        ast_log(LOG_WARNING, "Failed to start recording\n");
                        return -1;
                }
        }
        /* If we get here, we have a frame of Appropriate data */
        sofar = 0;
        pos = frame->data;
        while(sofar < frame->datalen) {
                /* Write in no more than maxfr sized frames */
                expected = frame->datalen - sofar;
                if (maxfr < expected)
                        expected = maxfr;
                /* XXX Internet Phone Jack does not handle the 4-byte VAD frame properly! XXX 
                   we have to pad it to 24 bytes still.  */
                if (frame->datalen == 4) {
                        if (p->silencesupression) {
                                memset(tmpbuf + 4, 0, sizeof(tmpbuf) - 4);
                                memcpy(tmpbuf, frame->data, 4);
                                expected = 24;
                                res = phone_write_buf(p, tmpbuf, expected, maxfr, 0);
                        }
                        res = 4;
                        expected=4;
                } else {
                        int swap = 0;
#if __BYTE_ORDER == __BIG_ENDIAN
                        if (frame->subclass == AST_FORMAT_SLINEAR)
                                swap = 1; /* Swap big-endian samples to little-endian as we copy */
#endif
                        res = phone_write_buf(p, pos, expected, maxfr, swap);
                }
                if (res != expected) {
                        if ((errno != EAGAIN) && (errno != EINTR)) {
                                if (res < 0) 
                                        ast_log(LOG_WARNING, "Write returned error (%s)\n", strerror(errno));
        /*
         * Card is in non-blocking mode now and it works well now, but there are
         * lot of messages like this. So, this message is temporarily disabled.
         */
#if 0
                                else
                                        ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frame->datalen);
#endif
                                return -1;
                        } else /* Pretend it worked */
                                res = expected;
                }
                sofar += res;
                pos += res;
        }
        return 0;
}

static struct ast_channel *phone_new(struct phone_pvt *i, int state, char *context)
{
        struct ast_channel *tmp;
        struct phone_codec_data codec;
        tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, "", i->ext, i->context, 0, "Phone/%s", i->dev + 5);
        if (tmp) {
                tmp->tech = cur_tech;
                tmp->fds[0] = i->fd;
                /* XXX Switching formats silently causes kernel panics XXX */
                if (i->mode == MODE_FXS &&
                    ioctl(i->fd, PHONE_QUERY_CODEC, &codec) == 0) {
                        if (codec.type == LINEAR16)
                                tmp->nativeformats =
                                tmp->rawreadformat =
                                tmp->rawwriteformat =
                                AST_FORMAT_SLINEAR;
                        else {
                                tmp->nativeformats =
                                tmp->rawreadformat =
                                tmp->rawwriteformat =
                                prefformat & ~AST_FORMAT_SLINEAR;
                        }
                }
                else {
                        tmp->nativeformats = prefformat;
                        tmp->rawreadformat = prefformat;
                        tmp->rawwriteformat = prefformat;
                }
                /* no need to call ast_setstate: the channel_alloc already did its job */
                if (state == AST_STATE_RING)
                        tmp->rings = 1;
                tmp->tech_pvt = i;
                ast_copy_string(tmp->context, context, sizeof(tmp->context));
                if (!ast_strlen_zero(i->ext))
                        ast_copy_string(tmp->exten, i->ext, sizeof(tmp->exten));
                else
                        strcpy(tmp->exten, "s");
                if (!ast_strlen_zero(i->language))
                        ast_string_field_set(tmp, language, i->language);

                /* Don't use ast_set_callerid() here because it will
                 * generate a NewCallerID event before the NewChannel event */
                tmp->cid.cid_num = ast_strdup(i->cid_num);
                tmp->cid.cid_ani = ast_strdup(i->cid_num);
                tmp->cid.cid_name = ast_strdup(i->cid_name);

                i->owner = tmp;
                ast_module_ref(ast_module_info->self);
                if (state != AST_STATE_DOWN) {
                        if (state == AST_STATE_RING) {
                                ioctl(tmp->fds[0], PHONE_RINGBACK);
                                i->cpt = 1;
                        }
                        if (ast_pbx_start(tmp)) {
                                ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
                                ast_hangup(tmp);
                        }
                }
        } else
                ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
        return tmp;
}

static void phone_mini_packet(struct phone_pvt *i)
{
        int res;
        char buf[1024];
        /* Ignore stuff we read... */
        res = read(i->fd, buf, sizeof(buf));
        if (res < 1) {
                ast_log(LOG_WARNING, "Read returned %d: %s\n", res, strerror(errno));
                return;
        }
}

static void phone_check_exception(struct phone_pvt *i)
{
        int offhook=0;
        char digit[2] = {0 , 0};
        union telephony_exception phonee;
        /* XXX Do something XXX */
#if 0
        ast_log(LOG_DEBUG, "Exception!\n");
#endif
        phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION);
        if (phonee.bits.dtmf_ready)  {
                digit[0] = ioctl(i->fd, PHONE_GET_DTMF_ASCII);
                if (i->mode == MODE_DIALTONE || i->mode == MODE_FXS || i->mode == MODE_SIGMA) {
                        ioctl(i->fd, PHONE_PLAY_STOP);
                        ioctl(i->fd, PHONE_REC_STOP);
                        ioctl(i->fd, PHONE_CPT_STOP);
                        i->dialtone = 0;
                        if (strlen(i->ext) < AST_MAX_EXTENSION - 1)
                                strncat(i->ext, digit, sizeof(i->ext) - strlen(i->ext) - 1);
                        if ((i->mode != MODE_FXS ||
                             !(phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION)) ||
                             !phonee.bits.dtmf_ready) &&
                            ast_exists_extension(NULL, i->context, i->ext, 1, i->cid_num)) {
                                /* It's a valid extension in its context, get moving! */
                                phone_new(i, AST_STATE_RING, i->context);
                                /* No need to restart monitor, we are the monitor */
                        } else if (!ast_canmatch_extension(NULL, i->context, i->ext, 1, i->cid_num)) {
                                /* There is nothing in the specified extension that can match anymore.
                                   Try the default */
                                if (ast_exists_extension(NULL, "default", i->ext, 1, i->cid_num)) {
                                        /* Check the default, too... */
                                        phone_new(i, AST_STATE_RING, "default");
                                        /* XXX This should probably be justified better XXX */
                                }  else if (!ast_canmatch_extension(NULL, "default", i->ext, 1, i->cid_num)) {
                                        /* It's not a valid extension, give a busy signal */
                                        if (option_debug)
                                                ast_log(LOG_DEBUG, "%s can't match anything in %s or default\n", i->ext, i->context);
                                        ioctl(i->fd, PHONE_BUSY);
                                        i->cpt = 1;
                                }
                        }
#if 0
                        ast_verbose("Extension is %s\n", i->ext);
#endif
                }
        }
        if (phonee.bits.hookstate) {
                offhook = ioctl(i->fd, PHONE_HOOKSTATE);
                if (offhook) {
                        if (i->mode == MODE_IMMEDIATE) {
                                phone_new(i, AST_STATE_RING, i->context);
                        } else if (i->mode == MODE_DIALTONE) {
                                ast_module_ref(ast_module_info->self);
                                /* Reset the extension */
                                i->ext[0] = '\0';
                                /* Play the dialtone */
                                i->dialtone++;
                                ioctl(i->fd, PHONE_PLAY_STOP);
                                ioctl(i->fd, PHONE_PLAY_CODEC, ULAW);
                                ioctl(i->fd, PHONE_PLAY_START);
                                i->lastformat = -1;
                        } else if (i->mode == MODE_SIGMA) {
                                ast_module_ref(ast_module_info->self);
                                /* Reset the extension */
                                i->ext[0] = '\0';
                                /* Play the dialtone */
                                i->dialtone++;
                                ioctl(i->fd, PHONE_DIALTONE);
                        }
                } else {
                        if (i->dialtone)
                                ast_module_unref(ast_module_info->self);
                        memset(i->ext, 0, sizeof(i->ext));
                        if (i->cpt)
                        {
                                ioctl(i->fd, PHONE_CPT_STOP);
                                i->cpt = 0;
                        }
                        ioctl(i->fd, PHONE_PLAY_STOP);
                        ioctl(i->fd, PHONE_REC_STOP);
                        i->dialtone = 0;
                        i->lastformat = -1;
                }
        }
        if (phonee.bits.pstn_ring) {
                ast_verbose("Unit is ringing\n");
                phone_new(i, AST_STATE_RING, i->context);
        }
        if (phonee.bits.caller_id)
                ast_verbose("We have caller ID\n");
        
        
}

static void *do_monitor(void *data)
{
        fd_set rfds, efds;
        int n, res;
        struct phone_pvt *i;
        int tonepos = 0;
        /* The tone we're playing this round */
        struct timeval tv = {0,0};
        int dotone;
        /* This thread monitors all the frame relay interfaces which are not yet in use
           (and thus do not have a separate thread) indefinitely */
        while (monitor) {
                /* Don't let anybody kill us right away.  Nobody should lock the interface list
                   and wait for the monitor list, but the other way around is okay. */
                /* Lock the interface list */
                if (ast_mutex_lock(&iflock)) {
                        ast_log(LOG_ERROR, "Unable to grab interface lock\n");
                        return NULL;
                }
                /* Build the stuff we're going to select on, that is the socket of every
                   phone_pvt that does not have an associated owner channel */
                n = -1;
                FD_ZERO(&rfds);
                FD_ZERO(&efds);
                i = iflist;
                dotone = 0;
                while (i) {
                        if (FD_ISSET(i->fd, &rfds)) 
                                ast_log(LOG_WARNING, "Descriptor %d appears twice (%s)?\n", i->fd, i->dev);
                        if (!i->owner) {
                                /* This needs to be watched, as it lacks an owner */
                                FD_SET(i->fd, &rfds);
                                FD_SET(i->fd, &efds);
                                if (i->fd > n)
                                        n = i->fd;
                                if (i->dialtone && i->mode != MODE_SIGMA) {
                                        /* Remember we're going to have to come back and play
                                           more dialtones */
                                        if (ast_tvzero(tv)) {
                                                /* If we're due for a dialtone, play one */
                                                if (write(i->fd, DialTone + tonepos, 240) != 240)
                                                        ast_log(LOG_WARNING, "Dial tone write error\n");
                                        }
                                        dotone++;
                                }
                        }
                        
                        i = i->next;
                }
                /* Okay, now that we know what to do, release the interface lock */
                ast_mutex_unlock(&iflock);

                /* Wait indefinitely for something to happen */
                if (dotone && i->mode != MODE_SIGMA) {
                        /* If we're ready to recycle the time, set it to 30 ms */
                        tonepos += 240;
                        if (tonepos >= sizeof(DialTone))
                                        tonepos = 0;
                        if (ast_tvzero(tv)) {
                                tv = ast_tv(30000, 0);
                        }
                        res = ast_select(n + 1, &rfds, NULL, &efds, &tv);
                } else {
                        res = ast_select(n + 1, &rfds, NULL, &efds, NULL);
                        tv = ast_tv(0,0);
                        tonepos = 0;
                }
                /* Okay, select has finished.  Let's see what happened.  */
                if (res < 0) {
                        ast_log(LOG_DEBUG, "select return %d: %s\n", res, strerror(errno));
                        continue;
                }
                /* If there are no fd's changed, just continue, it's probably time
                   to play some more dialtones */
                if (!res)
                        continue;
                /* Alright, lock the interface list again, and let's look and see what has
                   happened */
                if (ast_mutex_lock(&iflock)) {
                        ast_log(LOG_WARNING, "Unable to lock the interface list\n");
                        continue;
                }

                i = iflist;
                for(; i; i=i->next) {
                        if (FD_ISSET(i->fd, &rfds)) {
                                if (i->owner) {
                                        continue;
                                }
                                phone_mini_packet(i);
                        }
                        if (FD_ISSET(i->fd, &efds)) {
                                if (i->owner) {
                                        continue;
                                }
                                phone_check_exception(i);
                        }
                }
                ast_mutex_unlock(&iflock);
        }
        return NULL;
        
}

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

static struct phone_pvt *mkif(char *iface, int mode, int txgain, int rxgain)
{
        /* Make a phone_pvt structure for this interface */
        struct phone_pvt *tmp;
        int flags;      
        
        tmp = malloc(sizeof(struct phone_pvt));
        if (tmp) {
                tmp->fd = open(iface, O_RDWR);
                if (tmp->fd < 0) {
                        ast_log(LOG_WARNING, "Unable to open '%s'\n", iface);
                        free(tmp);
                        return NULL;
                }
                if (mode == MODE_FXO) {
                        if (ioctl(tmp->fd, IXJCTL_PORT, PORT_PSTN)) 
                                ast_log(LOG_DEBUG, "Unable to set port to PSTN\n");
                } else {
                        if (ioctl(tmp->fd, IXJCTL_PORT, PORT_POTS)) 
                                 if (mode != MODE_FXS)
                                      ast_log(LOG_DEBUG, "Unable to set port to POTS\n");
                }
                ioctl(tmp->fd, PHONE_PLAY_STOP);
                ioctl(tmp->fd, PHONE_REC_STOP);
                ioctl(tmp->fd, PHONE_RING_STOP);
                ioctl(tmp->fd, PHONE_CPT_STOP);
                if (ioctl(tmp->fd, PHONE_PSTN_SET_STATE, PSTN_ON_HOOK)) 
                        ast_log(LOG_DEBUG, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n",iface, strerror(errno));
                if (echocancel != AEC_OFF)
                        ioctl(tmp->fd, IXJCTL_AEC_START, echocancel);
                if (silencesupression) 
                        tmp->silencesupression = 1;
#ifdef PHONE_VAD
                ioctl(tmp->fd, PHONE_VAD, tmp->silencesupression);
#endif
                tmp->mode = mode;
                flags = fcntl(tmp->fd, F_GETFL);
                fcntl(tmp->fd, F_SETFL, flags | O_NONBLOCK);
                tmp->owner = NULL;
                tmp->lastformat = -1;
                tmp->lastinput = -1;
                tmp->ministate = 0;
                memset(tmp->ext, 0, sizeof(tmp->ext));
                ast_copy_string(tmp->language, language, sizeof(tmp->language));
                ast_copy_string(tmp->dev, iface, sizeof(tmp->dev));
                ast_copy_string(tmp->context, context, sizeof(tmp->context));
                tmp->next = NULL;
                tmp->obuflen = 0;
                tmp->dialtone = 0;
                tmp->cpt = 0;
                ast_copy_string(tmp->cid_num, cid_num, sizeof(tmp->cid_num));
                ast_copy_string(tmp->cid_name, cid_name, sizeof(tmp->cid_name));
                tmp->txgain = txgain;
                ioctl(tmp->fd, PHONE_PLAY_VOLUME, tmp->txgain);
                tmp->rxgain = rxgain;
                ioctl(tmp->fd, PHONE_REC_VOLUME, tmp->rxgain);
        }
        return tmp;
}

static struct ast_channel *phone_request(const char *type, int format, void *data, int *cause)
{
        int oldformat;
        struct phone_pvt *p;
        struct ast_channel *tmp = NULL;
        char *name = data;

        /* Search for an unowned channel */
        if (ast_mutex_lock(&iflock)) {
                ast_log(LOG_ERROR, "Unable to lock interface list???\n");
                return NULL;
        }
        p = iflist;
        while(p) {
                if (p->mode == MODE_FXS ||
                    format & (AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW)) {
                    size_t length = strlen(p->dev + 5);
                if (strncmp(name, p->dev + 5, length) == 0 &&
                    !isalnum(name[length])) {
                    if (!p->owner) {
                     tmp = phone_new(p, AST_STATE_DOWN, p->context);
                     break;
                } else
                     *cause = AST_CAUSE_BUSY;
            }
                }
                p = p->next;
        }
        ast_mutex_unlock(&iflock);
        restart_monitor();
        if (tmp == NULL) {
                oldformat = format;
                format &= (AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW);
                if (!format) {
                        ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", oldformat);
                        return NULL;
                }
        }
        return tmp;
}

/* parse gain value from config file */
static int parse_gain_value(char *gain_type, char *value)
{
        float gain;

        /* try to scan number */
        if (sscanf(value, "%f", &gain) != 1)
        {
                ast_log(LOG_ERROR, "Invalid %s value '%s' in '%s' config\n",
                        value, gain_type, config);
                return DEFAULT_GAIN;
        }

        /* multiplicate gain by 1.0 gain value */ 
        gain = gain * (float)DEFAULT_GAIN;

        /* percentage? */
        if (value[strlen(value) - 1] == '%')
                return (int)(gain / (float)100);

        return (int)gain;
}

static int __unload_module(void)
{
        struct phone_pvt *p, *pl;
        /* First, take us out of the channel loop */
        ast_channel_unregister(cur_tech);
        if (!ast_mutex_lock(&iflock)) {
                /* Hangup all interfaces if they have an owner */
                p = iflist;
                while(p) {
                        if (p->owner)
                                ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
                        p = p->next;
                }
                iflist = NULL;
                ast_mutex_unlock(&iflock);
        } else {
                ast_log(LOG_WARNING, "Unable to lock the monitor\n");
                return -1;
        }
        if (!ast_mutex_lock(&monlock)) {
                if (monitor_thread > AST_PTHREADT_NULL) {
                        monitor = 0;
                        while (pthread_kill(monitor_thread, SIGURG) == 0)
                                sched_yield();
                        pthread_join(monitor_thread, NULL);
                }
                monitor_thread = AST_PTHREADT_STOP;
                ast_mutex_unlock(&monlock);
        } else {
                ast_log(LOG_WARNING, "Unable to lock the monitor\n");
                return -1;
        }

        if (!ast_mutex_lock(&iflock)) {
                /* Destroy all the interfaces and free their memory */
                p = iflist;
                while(p) {
                        /* Close the socket, assuming it's real */
                        if (p->fd > -1)
                                close(p->fd);
                        pl = p;
                        p = p->next;
                        /* Free associated memory */
                        free(pl);
                }
                iflist = NULL;
                ast_mutex_unlock(&iflock);
        } else {
                ast_log(LOG_WARNING, "Unable to lock the monitor\n");
                return -1;
        }
                
        return 0;
}

static int unload_module(void)
{
        return __unload_module();
}

static int load_module(void)
{
        struct ast_config *cfg;
        struct ast_variable *v;
        struct phone_pvt *tmp;
        int mode = MODE_IMMEDIATE;
        int txgain = DEFAULT_GAIN, rxgain = DEFAULT_GAIN; /* default gain 1.0 */
        cfg = ast_config_load(config);

        /* We *must* have a config file otherwise stop immediately */
        if (!cfg) {
                ast_log(LOG_ERROR, "Unable to load config %s\n", config);
                return AST_MODULE_LOAD_DECLINE;
        }
        if (ast_mutex_lock(&iflock)) {
                /* It's a little silly to lock it, but we mind as well just to be sure */
                ast_log(LOG_ERROR, "Unable to lock interface list???\n");
                return -1;
        }
        v = ast_variable_browse(cfg, "interfaces");
        while(v) {
                /* Create the interface list */
                if (!strcasecmp(v->name, "device")) {
                                tmp = mkif(v->value, mode, txgain, rxgain);
                                if (tmp) {
                                        tmp->next = iflist;
                                        iflist = tmp;
                                        
                                } else {
                                        ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
                                        ast_config_destroy(cfg);
                                        ast_mutex_unlock(&iflock);
                                        __unload_module();
                                        return -1;
                                }
                } else if (!strcasecmp(v->name, "silencesupression")) {
                        silencesupression = ast_true(v->value);
                } else if (!strcasecmp(v->name, "language")) {
                        ast_copy_string(language, v->value, sizeof(language));
                } else if (!strcasecmp(v->name, "callerid")) {
                        ast_callerid_split(v->value, cid_name, sizeof(cid_name), cid_num, sizeof(cid_num));
                } else if (!strcasecmp(v->name, "mode")) {
                        if (!strncasecmp(v->value, "di", 2)) 
                                mode = MODE_DIALTONE;
                        else if (!strncasecmp(v->value, "sig", 3))
                                mode = MODE_SIGMA;
                        else if (!strncasecmp(v->value, "im", 2))
                                mode = MODE_IMMEDIATE;
                        else if (!strncasecmp(v->value, "fxs", 3)) {
                                mode = MODE_FXS;
                                prefformat = 0x01ff0000; /* All non-voice */
                        }
                        else if (!strncasecmp(v->value, "fx", 2))
                                mode = MODE_FXO;
                        else
                                ast_log(LOG_WARNING, "Unknown mode: %s\n", v->value);
                } else if (!strcasecmp(v->name, "context")) {
                        ast_copy_string(context, v->value, sizeof(context));
                } else if (!strcasecmp(v->name, "format")) {
                        if (!strcasecmp(v->value, "g723.1")) {
                                prefformat = AST_FORMAT_G723_1;
                        } else if (!strcasecmp(v->value, "slinear")) {
                                if (mode == MODE_FXS)
                                    prefformat |= AST_FORMAT_SLINEAR;
                                else prefformat = AST_FORMAT_SLINEAR;
                        } else if (!strcasecmp(v->value, "ulaw")) {
                                prefformat = AST_FORMAT_ULAW;
                        } else
                                ast_log(LOG_WARNING, "Unknown format '%s'\n", v->value);
                } else if (!strcasecmp(v->name, "echocancel")) {
                        if (!strcasecmp(v->value, "off")) {
                                echocancel = AEC_OFF;
                        } else if (!strcasecmp(v->value, "low")) {
                                echocancel = AEC_LOW;
                        } else if (!strcasecmp(v->value, "medium")) {
                                echocancel = AEC_MED;
                        } else if (!strcasecmp(v->value, "high")) {
                                echocancel = AEC_HIGH;
                        } else 
                                ast_log(LOG_WARNING, "Unknown echo cancellation '%s'\n", v->value);
                } else if (!strcasecmp(v->name, "txgain")) {
                        txgain = parse_gain_value(v->name, v->value);
                } else if (!strcasecmp(v->name, "rxgain")) {
                        rxgain = parse_gain_value(v->name, v->value);
                }       
                v = v->next;
        }
        ast_mutex_unlock(&iflock);

        if (mode == MODE_FXS) {
                phone_tech_fxs.capabilities = prefformat;
                cur_tech = &phone_tech_fxs;
        } else
                cur_tech = (struct ast_channel_tech *) &phone_tech;

        /* Make sure we can register our Adtranphone channel type */

        if (ast_channel_register(cur_tech)) {
                ast_log(LOG_ERROR, "Unable to register channel class 'Phone'\n");
                ast_config_destroy(cfg);
                __unload_module();
                return -1;
        }
        ast_config_destroy(cfg);
        /* And start the monitor for the first time */
        restart_monitor();
        return 0;
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Linux Telephony API Support");