Beispiel #1
0
static int i4l_startrec(struct ast_modem_pvt *p)
{
    if (ast_modem_send(p, "AT+VRX+VTX", 0) ||
            ast_modem_expect(p, "CONNECT", 5)) {
        ast_log(LOG_WARNING, "Unable to start recording\n");
        return -1;
    }
    p->ministate = STATE_VOICE;

    /*  let ast dsp detect dtmf */
    if (p->dtmfmode & MODEM_DTMF_AST) {
        if (p->dsp) {
            ast_log(LOG_DEBUG, "Already have a dsp on %s?\n", p->dev);
        } else {
            p->dsp = ast_dsp_new();
            if (p->dsp) {
                ast_log(LOG_DEBUG, "Detecting DTMF inband with sw DSP on %s\n",p->dev);
                ast_dsp_set_features(p->dsp, DSP_FEATURE_DTMF_DETECT|DSP_FEATURE_FAX_DETECT);
                ast_dsp_digitmode(p->dsp, DSP_DIGITMODE_DTMF | 0);
            }
        }
    }

    return 0;
}
Beispiel #2
0
static int i4l_answer(struct ast_modem_pvt *p)
{
    if (ast_modem_send(p, "ATA\r", 4) ||
            ast_modem_expect(p, "VCON", 10)) {
        ast_log(LOG_WARNING, "Unable to answer: %s", p->response);
        return -1;
    }
#if 1
    if (ast_modem_send(p, "AT+VDD=0,8", 0) ||
            ast_modem_expect(p, "OK", 5)) {
        ast_log(LOG_WARNING, "Unable to set to phone line interface\n");
        return -1;
    }
#endif
    if (ast_modem_send(p, "AT+VTX+VRX", 0) ||
            ast_modem_expect(p, "CONNECT", 10)) {
        ast_log(LOG_WARNING, "Unable to answer: %s", p->response);
        return -1;
    }
    p->ministate = STATE_VOICE;

    /*  let ast dsp detect dtmf */
    if (p->dtmfmode & MODEM_DTMF_AST) {
        if (p->dsp) {
            ast_log(LOG_DEBUG, "Already have a dsp on %s?\n", p->dev);
        } else {
            p->dsp = ast_dsp_new();
            if (p->dsp) {
                ast_log(LOG_DEBUG, "Detecting DTMF inband with sw DSP on %s\n",p->dev);
                ast_dsp_set_features(p->dsp, DSP_FEATURE_DTMF_DETECT|DSP_FEATURE_FAX_DETECT);
                ast_dsp_digitmode(p->dsp, DSP_DIGITMODE_DTMF | 0);
            }
        }
    }

    return 0;
}
static int nv_detectfax_exec(struct ast_channel *chan, const char *data)
{
	int res = 0;
	char tmp[256] = "\0";
	char *p = NULL;
	char *waitstr = NULL;
	char *options = NULL;
	char *silstr = NULL;
	char *minstr = NULL;
	char *maxstr = NULL;
	struct ast_frame *fr = NULL;
	struct ast_frame *fr2 = NULL;
	int notsilent = 0;
	struct timeval start = {0, 0}, end = {0, 0};
	int waitdur = 4;
	int sildur = 1000;
	int mindur = 100;
	int maxdur = -1;
	int skipanswer = 0;
	int noextneeded = 0;
	int ignoredtmf = 0;
	int ignorefax = 0;
	int ignoretalk = 0;
	int x = 0;
	struct ast_format* origrformat = NULL;
	int features = 0;
	time_t timeout = 0;
	struct ast_dsp *dsp = NULL;
	
	struct ast_format_cap *cap;
	struct ast_format linearFormat;
	
	/* linear format capabilities */
	ast_format_set(&linearFormat, AST_FORMAT_SLINEAR, 0);
	cap = ast_format_cap_alloc_nolock();
	ast_format_cap_add(cap, &linearFormat);
	/* done */
	
	pbx_builtin_setvar_helper(chan, "FAX_DETECTED", "");
	pbx_builtin_setvar_helper(chan, "FAXEXTEN", "");
	pbx_builtin_setvar_helper(chan, "DTMF_DETECTED", "");
	pbx_builtin_setvar_helper(chan, "TALK_DETECTED", "");
	
	if (data || !ast_strlen_zero(data)) {
		strncpy(tmp, data, sizeof(tmp)-1);
	}	
	
	p = tmp;
	
	waitstr = strsep(&p, ",");
	options = strsep(&p, ",");
	silstr = strsep(&p, ",");
	minstr = strsep(&p, ",");	
	maxstr = strsep(&p, ",");	
	
	if (waitstr) {
		if ((sscanf(waitstr, "%d", &x) == 1) && (x > 0))
			waitdur = x;
	}
	
	if (options) {
		if (strchr(options, 'n'))
			skipanswer = 1;
		if (strchr(options, 'x'))
			noextneeded = 1;
		if (strchr(options, 'd'))
			ignoredtmf = 1;
		if (strchr(options, 'f'))
			ignorefax = 1;
		if (strchr(options, 't'))
			ignoretalk = 1;
	}
	
	if (silstr) {
		if ((sscanf(silstr, "%d", &x) == 1) && (x > 0))
			sildur = x;
	}
	
	if (minstr) {
		if ((sscanf(minstr, "%d", &x) == 1) && (x > 0))
			mindur = x;
	}
	
	if (maxstr) {
		if ((sscanf(maxstr, "%d", &x) == 1) && (x > 0))
			maxdur = x;
	}
	
	ast_log(LOG_DEBUG, "Preparing detect of fax (waitdur=%dms, sildur=%dms, mindur=%dms, maxdur=%dms)\n", 
						waitdur, sildur, mindur, maxdur);
						
	//	LOCAL_USER_ADD(u);
// 	if (chan->_state != AST_STATE_UP && !skipanswer) {
	if (ast_channel_state(chan) != AST_STATE_UP && !skipanswer) {
		/* Otherwise answer unless we're supposed to send this while on-hook */
		res = ast_answer(chan);
	}
	if (!res) {
// 		origrformat = chan->readformat;
		origrformat = ast_channel_readformat(chan);
		
// 		if ((res = ast_set_read_format(chan, AST_FORMAT_SLINEAR))) 
		if ((res = ast_set_read_format_from_cap(chan, cap)) ){
			ast_log(LOG_WARNING, "Unable to set read format to linear!\n");
		}
	}
	if (!(dsp = ast_dsp_new())) {
		ast_log(LOG_WARNING, "Unable to allocate DSP!\n");
		res = -1;
	}
	
	if (dsp) {	
		if (!ignoretalk)
			; /* features |= DSP_FEATURE_SILENCE_SUPPRESS; */
		if (!ignorefax)
			features |= DSP_FEATURE_FAX_DETECT;
		//if (!ignoredtmf)
			features |= DSP_FEATURE_DIGIT_DETECT;
			
		ast_dsp_set_threshold(dsp, 256); 
		ast_dsp_set_features(dsp, features | DSP_DIGITMODE_RELAXDTMF);
		ast_dsp_set_digitmode(dsp, DSP_DIGITMODE_DTMF);
	}

	if (!res) {
		if (waitdur > 0)
			timeout = time(NULL) + (time_t)waitdur;

		while(ast_waitfor(chan, -1) > -1) {
			if (waitdur > 0 && time(NULL) > timeout) {
				res = 0;
				break;
			}

			fr = ast_read(chan);
			if (!fr) {
				ast_log(LOG_DEBUG, "Got hangup\n");
				res = -1;
				break;
			}

			fr2 = ast_dsp_process(chan, dsp, fr);
			if (!fr2) {
				ast_log(LOG_WARNING, "Bad DSP received (what happened?)\n");
				fr2 = fr;
			} 

			if (fr2->frametype == AST_FRAME_DTMF) {
				if (fr2->subclass.integer == 'f' && !ignorefax) {
					/* Fax tone -- Handle and return NULL */
					ast_log(LOG_DEBUG, "Fax detected on %s\n", ast_channel_name(chan));
					ast_log(LOG_DEBUG, "Fax detected on %s\n", ast_channel_name(chan));
					if (strcmp(ast_channel_exten(chan), "fax")) {
						ast_log(LOG_NOTICE, "Redirecting %s to fax extension\n", ast_channel_name(chan));
						pbx_builtin_setvar_helper(chan, "FAX_DETECTED", "1");
						pbx_builtin_setvar_helper(chan,"FAXEXTEN",ast_channel_exten(chan));								
						if (ast_exists_extension(chan, ast_channel_context(chan), "fax", 1, ast_channel_caller(chan)->id.number.str)) {
							/* Save the DID/DNIS when we transfer the fax call to a "fax" extension */
// 							strncpy(ast_channel_exten(chan), "fax", sizeof(ast_channel_exten(chan))-1);
// 							chan->priority = 0;
							ast_channel_exten_set(chan, "fax");
							ast_channel_priority_set(chan, 0);
						} else
							ast_log(LOG_WARNING, "Fax detected, but no fax extension\n");
					} else
						ast_log(LOG_WARNING, "Already in a fax extension, not redirecting\n");

					res = 0;
					ast_frfree(fr);
					break;
				} else if (!ignoredtmf) {
					ast_log(LOG_DEBUG, "DTMF detected on %s\n", ast_channel_name(chan));
					char t[2];
					t[0] = fr2->subclass.integer;
					t[1] = '\0';
					if (noextneeded || ast_canmatch_extension(chan, ast_channel_context(chan), t, 1, ast_channel_caller(chan)->id.number.str)) {
						pbx_builtin_setvar_helper(chan, "DTMF_DETECTED", "1");
						/* They entered a valid extension, or might be anyhow */
						if (noextneeded) {
							ast_log(LOG_NOTICE, "DTMF received (not matching to exten)\n");
							res = 0;
						} else {
							ast_log(LOG_NOTICE, "DTMF received (matching to exten)\n");
							res = fr2->subclass.integer;
						}
						ast_frfree(fr);
						break;
					} else
						ast_log(LOG_DEBUG, "Valid extension requested and DTMF did not match\n");
				}
// 			} else if ((fr->frametype == AST_FRAME_VOICE) && (fr->subclass == AST_FORMAT_SLINEAR) && !ignoretalk) {
			} else if ((fr->frametype == AST_FRAME_VOICE) && ( ast_format_cap_iscompatible(cap, &fr->subclass.format)) && !ignoretalk) {
				int totalsilence;
				int ms;
				res = ast_dsp_silence(dsp, fr, &totalsilence);
				if (res && (totalsilence > sildur)) {
					/* We've been quiet a little while */
					if (notsilent) {
						/* We had heard some talking */
						gettimeofday(&end, NULL);
						ms = (end.tv_sec - start.tv_sec) * 1000;
						ms += (end.tv_usec - start.tv_usec) / 1000;
						ms -= sildur;
						if (ms < 0)
							ms = 0;
						if ((ms > mindur) && ((maxdur < 0) || (ms < maxdur))) {
							char ms_str[10];
							ast_log(LOG_DEBUG, "Found qualified token of %d ms\n", ms);
							ast_log(LOG_NOTICE, "Redirecting %s to talk extension\n", ast_channel_name(chan));

							/* Save detected talk time (in milliseconds) */ 
							sprintf(ms_str, "%d", ms);	
							pbx_builtin_setvar_helper(chan, "TALK_DETECTED", ms_str);

							if (ast_exists_extension(chan, ast_channel_context(chan), "talk", 1, ast_channel_caller(chan)->id.number.str)) {
// 								strncpy(ast_channel_exten(chan), "talk", sizeof(ast_channel_exten(chan)) - 1);
// 								chan->priority = 0;
								ast_channel_exten_set(chan, "talk");
								ast_channel_priority_set(chan, 0);
							} else
								ast_log(LOG_WARNING, "Talk detected, but no talk extension\n");
							res = 0;
							ast_frfree(fr);
							break;
						} else
							ast_log(LOG_DEBUG, "Found unqualified token of %d ms\n", ms);
						notsilent = 0;
					}
				} else {
					if (!notsilent) {
						/* Heard some audio, mark the begining of the token */
						gettimeofday(&start, NULL);
						ast_log(LOG_DEBUG, "Start of voice token!\n");
						notsilent = 1;
					}
				}						
			}
			ast_frfree(fr);
		}
	} else
		ast_log(LOG_WARNING, "Could not answer channel '%s'\n", ast_channel_name(chan));
	
	if (res > -1) {
		if (origrformat && ast_set_read_format(chan, origrformat)) {
			ast_log(LOG_WARNING, "Failed to restore read format for %s to %s\n", 
				ast_channel_name(chan), ast_getformatname(origrformat));
		}
	}
	
	if (dsp)
		ast_dsp_free(dsp);
	
	//	LOCAL_USER_REMOVE(u);
	ast_format_cap_destroy(cap);
	return res;
}
Beispiel #4
0
static int set_caps(struct ast_sip_session *session, struct ast_sip_session_media *session_media,
		    const struct pjmedia_sdp_media *stream)
{
	RAII_VAR(struct ast_format_cap *, caps, NULL, ao2_cleanup);
	RAII_VAR(struct ast_format_cap *, peer, NULL, ao2_cleanup);
	RAII_VAR(struct ast_format_cap *, joint, NULL, ao2_cleanup);
	enum ast_media_type media_type = stream_to_media_type(session_media->stream_type);
	struct ast_rtp_codecs codecs = AST_RTP_CODECS_NULL_INIT;
	int fmts = 0;
	int direct_media_enabled = !ast_sockaddr_isnull(&session_media->direct_media_addr) &&
		ast_format_cap_count(session->direct_media_cap);
	int dsp_features = 0;

	if (!(caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT)) ||
	    !(peer = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT)) ||
	    !(joint = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
		ast_log(LOG_ERROR, "Failed to allocate %s capabilities\n", session_media->stream_type);
		return -1;
	}

	/* get the endpoint capabilities */
	if (direct_media_enabled) {
		ast_format_cap_get_compatible(session->endpoint->media.codecs, session->direct_media_cap, caps);
		format_cap_only_type(caps, media_type);
	} else {
		ast_format_cap_append_from_cap(caps, session->endpoint->media.codecs, media_type);
	}

	/* get the capabilities on the peer */
	get_codecs(session, stream, &codecs,  session_media);
	ast_rtp_codecs_payload_formats(&codecs, peer, &fmts);

	/* get the joint capabilities between peer and endpoint */
	ast_format_cap_get_compatible(caps, peer, joint);
	if (!ast_format_cap_count(joint)) {
		struct ast_str *usbuf = ast_str_alloca(256);
		struct ast_str *thembuf = ast_str_alloca(256);

		ast_rtp_codecs_payloads_destroy(&codecs);
		ast_log(LOG_NOTICE, "No joint capabilities for '%s' media stream between our configuration(%s) and incoming SDP(%s)\n",
			session_media->stream_type,
			ast_format_cap_get_names(caps, &usbuf),
			ast_format_cap_get_names(peer, &thembuf));
		return -1;
	}

	ast_rtp_codecs_payloads_copy(&codecs, ast_rtp_instance_get_codecs(session_media->rtp),
				     session_media->rtp);

	ast_format_cap_append_from_cap(session->req_caps, joint, AST_MEDIA_TYPE_UNKNOWN);

	if (session->channel) {
		ast_channel_lock(session->channel);
		ast_format_cap_remove_by_type(caps, AST_MEDIA_TYPE_UNKNOWN);
		ast_format_cap_append_from_cap(caps, ast_channel_nativeformats(session->channel),
			AST_MEDIA_TYPE_UNKNOWN);
		ast_format_cap_remove_by_type(caps, media_type);
		ast_format_cap_append_from_cap(caps, joint, media_type);

		/*
		 * Apply the new formats to the channel, potentially changing
		 * raw read/write formats and translation path while doing so.
		 */
		ast_channel_nativeformats_set(session->channel, caps);
		if (media_type == AST_MEDIA_TYPE_AUDIO) {
			ast_set_read_format(session->channel, ast_channel_readformat(session->channel));
			ast_set_write_format(session->channel, ast_channel_writeformat(session->channel));
		}
		if ((session->endpoint->dtmf == AST_SIP_DTMF_AUTO)
		    && (ast_rtp_instance_dtmf_mode_get(session_media->rtp) == AST_RTP_DTMF_MODE_RFC2833)
		    && (session->dsp)) {
			dsp_features = ast_dsp_get_features(session->dsp);
			dsp_features &= ~DSP_FEATURE_DIGIT_DETECT;
			if (dsp_features) {
				ast_dsp_set_features(session->dsp, dsp_features);
			} else {
				ast_dsp_free(session->dsp);
				session->dsp = NULL;
			}
		}
		ast_channel_unlock(session->channel);
	}

	ast_rtp_codecs_payloads_destroy(&codecs);
	return 0;
}
Beispiel #5
0
static int transmit_audio(fax_session *s)
{
	int res = -1;
	int original_read_fmt = AST_FORMAT_SLINEAR;
	int original_write_fmt = AST_FORMAT_SLINEAR;
	fax_state_t fax;
	struct ast_dsp *dsp = NULL;
	int detect_tone = 0;
	struct ast_frame *inf = NULL;
	struct ast_frame *fr;
	int last_state = 0;
	struct timeval now, start, state_change;
	enum ast_control_t38 t38control;

	original_read_fmt = s->chan->readformat;
	if (original_read_fmt != AST_FORMAT_SLINEAR) {
		res = ast_set_read_format(s->chan, AST_FORMAT_SLINEAR);
		if (res < 0) {
			ast_log(LOG_WARNING, "Unable to set to linear read mode, giving up\n");
			goto done;
		}
	}

	original_write_fmt = s->chan->writeformat;
	if (original_write_fmt != AST_FORMAT_SLINEAR) {
		res = ast_set_write_format(s->chan, AST_FORMAT_SLINEAR);
		if (res < 0) {
			ast_log(LOG_WARNING, "Unable to set to linear write mode, giving up\n");
			goto done;
		}
	}

	/* Initialize T30 terminal */
	fax_init(&fax, s->caller_mode);

	/* Setup logging */
	set_logging(&fax.logging);
	set_logging(&fax.t30_state.logging);

	/* Configure terminal */
	set_local_info(&fax.t30_state, s);
	set_file(&fax.t30_state, s);
	set_ecm(&fax.t30_state, TRUE);

	fax_set_transmit_on_idle(&fax, TRUE);

	t30_set_phase_e_handler(&fax.t30_state, phase_e_handler, s);

	if (s->t38state == T38_STATE_UNAVAILABLE) {
		ast_debug(1, "T38 is unavailable on %s\n", s->chan->name);
	} else if (!s->direction) {
		/* We are receiving side and this means we are the side which should
		   request T38 when the fax is detected. Use DSP to detect fax tone */
		ast_debug(1, "Setting up CNG detection on %s\n", s->chan->name);
		dsp = ast_dsp_new();
		ast_dsp_set_features(dsp, DSP_FEATURE_FAX_DETECT);
		ast_dsp_set_faxmode(dsp, DSP_FAXMODE_DETECT_CNG);
		detect_tone = 1;
	}

	start = state_change = ast_tvnow();

	ast_activate_generator(s->chan, &generator, &fax);

	while (!s->finished) {
		res = ast_waitfor(s->chan, 20);
		if (res < 0)
			break;
		else if (res > 0)
			res = 0;

		inf = ast_read(s->chan);
		if (inf == NULL) {
			ast_debug(1, "Channel hangup\n");
			res = -1;
			break;
		}

		ast_debug(10, "frame %d/%d, len=%d\n", inf->frametype, inf->subclass, inf->datalen);

		/* Detect fax tone */
		if (detect_tone && inf->frametype == AST_FRAME_VOICE) {
			/* Duplicate frame because ast_dsp_process may free the frame passed */
			fr = ast_frdup(inf);

			/* Do not pass channel to ast_dsp_process otherwise it may queue modified audio frame back */
			fr = ast_dsp_process(NULL, dsp, fr);
			if (fr && fr->frametype == AST_FRAME_DTMF && fr->subclass == 'f') {
				ast_debug(1, "Fax tone detected. Requesting T38\n");
				t38control = AST_T38_REQUEST_NEGOTIATE;
				ast_indicate_data(s->chan, AST_CONTROL_T38, &t38control, sizeof(t38control));
				detect_tone = 0;
			}

			ast_frfree(fr);
		}


		/* Check the frame type. Format also must be checked because there is a chance
		   that a frame in old format was already queued before we set chanel format
		   to slinear so it will still be received by ast_read */
		if (inf->frametype == AST_FRAME_VOICE && inf->subclass == AST_FORMAT_SLINEAR) {

			if (fax_rx(&fax, inf->data, inf->samples) < 0) {
				/* I know fax_rx never returns errors. The check here is for good style only */
				ast_log(LOG_WARNING, "fax_rx returned error\n");
				res = -1;
				break;
			}

			/* Watchdog */
			if (last_state != fax.t30_state.state) {
				state_change = ast_tvnow();
				last_state = fax.t30_state.state;
			}
		} else if (inf->frametype == AST_FRAME_CONTROL && inf->subclass == AST_CONTROL_T38 &&
				inf->datalen == sizeof(enum ast_control_t38)) {
			t38control =*((enum ast_control_t38 *) inf->data);
			if (t38control == AST_T38_NEGOTIATED) {
				/* T38 switchover completed */
				ast_debug(1, "T38 negotiated, finishing audio loop\n");
				res = 1;
				break;
			}
		}

		ast_frfree(inf);
		inf = NULL;

		/* Watchdog */
		now = ast_tvnow();
		if (ast_tvdiff_sec(now, start) > WATCHDOG_TOTAL_TIMEOUT || ast_tvdiff_sec(now, state_change) > WATCHDOG_STATE_TIMEOUT) {
			ast_log(LOG_WARNING, "It looks like we hung. Aborting.\n");
			res = -1;
			break;
		}
	}

	ast_debug(1, "Loop finished, res=%d\n", res);

	if (inf)
		ast_frfree(inf);

	if (dsp)
		ast_dsp_free(dsp);

	ast_deactivate_generator(s->chan);

	/* If we are switching to T38, remove phase E handler. Otherwise it will be executed
	   by t30_terminate, display diagnostics and set status variables although no transmittion
	   has taken place yet. */
	if (res > 0) {
		t30_set_phase_e_handler(&fax.t30_state, NULL, NULL);
	}

	t30_terminate(&fax.t30_state);
	fax_release(&fax);

done:
	if (original_write_fmt != AST_FORMAT_SLINEAR) {
		if (ast_set_write_format(s->chan, original_write_fmt) < 0)
			ast_log(LOG_WARNING, "Unable to restore write format on '%s'\n", s->chan->name);
	}

	if (original_read_fmt != AST_FORMAT_SLINEAR) {
		if (ast_set_read_format(s->chan, original_read_fmt) < 0)
			ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", s->chan->name);
	}

	return res;

}
static int nv_background_detect_exec(struct ast_channel *chan, void *data)
{
	int res = 0;
	struct ast_module_user *u;
	char tmp[256] = "\0";
	char *p = NULL;
	char *filename = NULL;
	char *options = NULL;
	char *silstr = NULL;
	char *minstr = NULL;
	char *maxstr = NULL;
	struct ast_frame *fr = NULL;
	struct ast_frame *fr2 = NULL;
	int notsilent = 0;
	struct timeval start = {0, 0}, end = {0, 0};
	int sildur = 1000;
	int mindur = 100;
	int maxdur = -1;
	int skipanswer = 0;
	int noextneeded = 0;
	int ignoredtmf = 0;
	int ignorefax = 0;
	int ignoretalk = 0;
	int x = 0;
	int origrformat = 0;
	int features = 0;
	struct ast_dsp *dsp = NULL;
	
	pbx_builtin_setvar_helper(chan, "FAX_DETECTED", "");
	pbx_builtin_setvar_helper(chan, "FAXEXTEN", "");
	pbx_builtin_setvar_helper(chan, "DTMF_DETECTED", "");
	pbx_builtin_setvar_helper(chan, "TALK_DETECTED", "");
	
	if (!data || ast_strlen_zero((char *)data)) {
		ast_log(LOG_WARNING, "NVBackgroundDetect requires an argument (filename)\n");
		return -1;
	}	
	
	strncpy(tmp, (char *)data, sizeof(tmp)-1);
	p = tmp;
	
	filename = strsep(&p, "|");
	options = strsep(&p, "|");
	silstr = strsep(&p, "|");
	minstr = strsep(&p, "|");	
	maxstr = strsep(&p, "|");	
	
	if (options) {
		if (strchr(options, 'n'))
			skipanswer = 1;
		if (strchr(options, 'x'))
			noextneeded = 1;
		if (strchr(options, 'd'))
			ignoredtmf = 1;
		if (strchr(options, 'f'))
			ignorefax = 1;
		if (strchr(options, 't'))
			ignoretalk = 1;
	}
	
	if (silstr) {
		if ((sscanf(silstr, "%d", &x) == 1) && (x > 0))
			sildur = x;
	}
	
	if (minstr) {
		if ((sscanf(minstr, "%d", &x) == 1) && (x > 0))
			mindur = x;
	}
	
	if (maxstr) {
		if ((sscanf(maxstr, "%d", &x) == 1) && (x > 0))
			maxdur = x;
	}
	
	ast_log(LOG_DEBUG, "Preparing detect of '%s' (sildur=%dms, mindur=%dms, maxdur=%dms)\n", 
						tmp, sildur, mindur, maxdur);
						
	u = ast_module_user_add(chan);
	if (chan->_state != AST_STATE_UP && !skipanswer) {
		/* Otherwise answer unless we're supposed to send this while on-hook */
		res = ast_answer(chan);
	}
	if (!res) {
		origrformat = chan->readformat;
		if ((res = ast_set_read_format(chan, AST_FORMAT_SLINEAR))) 
			ast_log(LOG_WARNING, "Unable to set read format to linear!\n");
	}
	if (!(dsp = ast_dsp_new())) {
		ast_log(LOG_WARNING, "Unable to allocate DSP!\n");
		res = -1;
	}

	if (dsp) {	
		if (!ignoretalk)
			; /* features |= DSP_FEATURE_SILENCE_SUPPRESS; */
		if (!ignorefax)
			features |= DSP_FEATURE_FAX_DETECT;
		//if (!ignoredtmf)
			features |= DSP_FEATURE_DTMF_DETECT;
			
		ast_dsp_set_threshold(dsp, 256);
		ast_dsp_set_features(dsp, features | DSP_DIGITMODE_RELAXDTMF);
		ast_dsp_digitmode(dsp, DSP_DIGITMODE_DTMF);
	}
	
	if (!res) {
		ast_stopstream(chan);
		res = ast_streamfile(chan, tmp, chan->language);
		if (!res) {
			while(chan->stream) {
				res = ast_sched_wait(chan->sched);
				if ((res < 0) && !chan->timingfunc) {
					res = 0;
					break;
				}
				if (res < 0)
					res = 1000;
				res = ast_waitfor(chan, res);
				if (res < 0) {
					ast_log(LOG_WARNING, "Waitfor failed on %s\n", chan->name);
					break;
				} else if (res > 0) {
					fr = ast_read(chan);
					if (!fr) {
						ast_log(LOG_DEBUG, "Got hangup\n");
						res = -1;
						break;
					}
					
					fr2 = ast_dsp_process(chan, dsp, fr);
					if (!fr2) {
						ast_log(LOG_WARNING, "Bad DSP received (what happened?)\n");
						fr2 = fr;
					} 
					
					if (fr2->frametype == AST_FRAME_DTMF) {
						if (fr2->subclass == 'f' && !ignorefax) {
							/* Fax tone -- Handle and return NULL */
							ast_log(LOG_DEBUG, "Fax detected on %s\n", chan->name);
							if (strcmp(chan->exten, "fax")) {
								ast_log(LOG_NOTICE, "Redirecting %s to fax extension\n", chan->name);
								pbx_builtin_setvar_helper(chan, "FAX_DETECTED", "1");
								pbx_builtin_setvar_helper(chan,"FAXEXTEN",chan->exten);								
								if (ast_exists_extension(chan, chan->context, "fax", 1, chan->CALLERID_FIELD)) {
									/* Save the DID/DNIS when we transfer the fax call to a "fax" extension */
									strncpy(chan->exten, "fax", sizeof(chan->exten)-1);
									chan->priority = 0;									
								} else
									ast_log(LOG_WARNING, "Fax detected, but no fax extension\n");
							} else
								ast_log(LOG_WARNING, "Already in a fax extension, not redirecting\n");

							res = 0;
							ast_frfree(fr);
							break;
						} else if (!ignoredtmf) {
							char t[2];
							t[0] = fr2->subclass;
							t[1] = '\0';
							ast_log(LOG_DEBUG, "DTMF detected on %s\n", chan->name);
							if (noextneeded || ast_canmatch_extension(chan, chan->context, t, 1, chan->CALLERID_FIELD)) {
								pbx_builtin_setvar_helper(chan, "DTMF_DETECTED", "1");
								/* They entered a valid extension, or might be anyhow */
								if (noextneeded) {
									ast_log(LOG_NOTICE, "DTMF received (not matching to exten)\n");
									res = 0;
								} else {
									ast_log(LOG_NOTICE, "DTMF received (matching to exten)\n");
									res = fr2->subclass;
								}
								ast_frfree(fr);
								break;
							} else
								ast_log(LOG_DEBUG, "Valid extension requested and DTMF did not match\n");
						}
					} else if ((fr->frametype == AST_FRAME_VOICE) && (fr->subclass == AST_FORMAT_SLINEAR) && !ignoretalk) {
						int totalsilence;
						int ms;
						res = ast_dsp_silence(dsp, fr, &totalsilence);
						if (res && (totalsilence > sildur)) {
							/* We've been quiet a little while */
							if (notsilent) {
								/* We had heard some talking */
								gettimeofday(&end, NULL);
								ms = (end.tv_sec - start.tv_sec) * 1000;
								ms += (end.tv_usec - start.tv_usec) / 1000;
								ms -= sildur;
								if (ms < 0)
									ms = 0;
								if ((ms > mindur) && ((maxdur < 0) || (ms < maxdur))) {
									char ms_str[10];
									ast_log(LOG_DEBUG, "Found qualified token of %d ms\n", ms);
									ast_log(LOG_NOTICE, "Redirecting %s to talk extension\n", chan->name);

									/* Save detected talk time (in milliseconds) */ 
									sprintf(ms_str, "%d", ms);	
									pbx_builtin_setvar_helper(chan, "TALK_DETECTED", ms_str);
									
									if (ast_exists_extension(chan, chan->context, "talk", 1, chan->CALLERID_FIELD)) {
										strncpy(chan->exten, "talk", sizeof(chan->exten) - 1);
										chan->priority = 0;
									} else
										ast_log(LOG_WARNING, "Talk detected, but no talk extension\n");
									res = 0;
									ast_frfree(fr);
									break;
								} else
									ast_log(LOG_DEBUG, "Found unqualified token of %d ms\n", ms);
								notsilent = 0;
							}
						} else {
							if (!notsilent) {
								/* Heard some audio, mark the begining of the token */
								gettimeofday(&start, NULL);
								ast_log(LOG_DEBUG, "Start of voice token!\n");
								notsilent = 1;
							}
						}						
					}
					ast_frfree(fr);
				}
				ast_sched_runq(chan->sched);
			}
			ast_stopstream(chan);
		} else {
			ast_log(LOG_WARNING, "ast_streamfile failed on %s for %s\n", chan->name, (char *)data);
			res = 0;
		}
	} else
		ast_log(LOG_WARNING, "Could not answer channel '%s'\n", chan->name);
	
	if (res > -1) {
		if (origrformat && ast_set_read_format(chan, origrformat)) {
			ast_log(LOG_WARNING, "Failed to restore read format for %s to %s\n", 
				chan->name, ast_getformatname(origrformat));
		}
	}
	
	if (dsp)
		ast_dsp_free(dsp);
	
	ast_module_user_remove(u);
	
	return res;
}