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-rw-r--r--channels/chan_sip.c98
1 files changed, 62 insertions, 36 deletions
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 5790824f9..e04e33381 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -1007,6 +1007,7 @@ struct sip_auth {
#define SIP_PAGE2_RFC2833_COMPENSATE (1 << 25) /*!< DP: Compensate for buggy RFC2833 implementations */
#define SIP_PAGE2_BUGGY_MWI (1 << 26) /*!< DP: Buggy CISCO MWI fix */
#define SIP_PAGE2_DIALOG_ESTABLISHED (1 << 27) /*!< 29: Has a dialog been established? */
+#define SIP_PAGE2_FAX_DETECT (1 << 28) /*!< DP: Fax Detection support */
#define SIP_PAGE2_REGISTERTRYING (1 << 29) /*!< DP: Send 100 Trying on REGISTER attempts */
#define SIP_PAGE2_UDPTL_DESTINATION (1 << 30) /*!< DP: Use source IP of RTP as destination if NAT is enabled */
#define SIP_PAGE2_CONSTANT_SSRC (1 << 31) /*!< GDP: Don't change SSRC on reinvite */
@@ -1015,7 +1016,7 @@ struct sip_auth {
(SIP_PAGE2_ALLOWSUBSCRIBE | SIP_PAGE2_ALLOWOVERLAP | SIP_PAGE2_IGNORESDPVERSION | \
SIP_PAGE2_VIDEOSUPPORT | SIP_PAGE2_T38SUPPORT | SIP_PAGE2_RFC2833_COMPENSATE | \
SIP_PAGE2_BUGGY_MWI | SIP_PAGE2_TEXTSUPPORT | SIP_PAGE2_UDPTL_DESTINATION | \
- SIP_PAGE2_CONSTANT_SSRC)
+ SIP_PAGE2_CONSTANT_SSRC | SIP_PAGE2_FAX_DETECT)
/*@}*/
@@ -1280,7 +1281,7 @@ struct sip_pvt {
int laststate; /*!< SUBSCRIBE: Last known extension state */
int dialogver; /*!< SUBSCRIBE: Version for subscription dialog-info */
- struct ast_dsp *vad; /*!< Inband DTMF Detection dsp */
+ struct ast_dsp *dsp; /*!< A DSP for inband DTMF and fax CNG tone detection */
struct sip_peer *relatedpeer; /*!< If this dialog is related to a peer, which one
Used in peerpoke, mwi subscriptions */
@@ -5160,8 +5161,8 @@ static int sip_hangup(struct ast_channel *ast)
append_history(p, needcancel ? "Cancel" : "Hangup", "Cause %s", p->owner ? ast_cause2str(p->hangupcause) : "Unknown");
/* Disconnect */
- if (p->vad)
- ast_dsp_free(p->vad);
+ if (p->dsp)
+ ast_dsp_free(p->dsp);
p->owner = NULL;
ast->tech_pvt = NULL;
@@ -5774,12 +5775,19 @@ static struct ast_channel *sip_new(struct sip_pvt *i, int state, const char *tit
else
ast_debug(3, "This channel will not be able to handle video.\n");
- if ((ast_test_flag(&i->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) || (ast_test_flag(&i->flags[0], SIP_DTMF) == SIP_DTMF_AUTO)) {
- i->vad = ast_dsp_new();
- ast_dsp_set_features(i->vad, DSP_FEATURE_DTMF_DETECT);
- if (global_relaxdtmf)
- ast_dsp_digitmode(i->vad, DSP_DIGITMODE_DTMF | DSP_DIGITMODE_RELAXDTMF);
- }
+ if ((ast_test_flag(&i->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) || (ast_test_flag(&i->flags[0], SIP_DTMF) == SIP_DTMF_AUTO) ||
+ (ast_test_flag(&i->flags[1], SIP_PAGE2_FAX_DETECT))) {
+ int features = DSP_FEATURE_DTMF_DETECT;
+
+ if (ast_test_flag(&i->flags[1], SIP_PAGE2_FAX_DETECT)) {
+ features |= DSP_FEATURE_FAX_DETECT;
+ }
+
+ i->dsp = ast_dsp_new();
+ ast_dsp_set_features(i->dsp, features);
+ if (global_relaxdtmf)
+ ast_dsp_digitmode(i->dsp, DSP_DIGITMODE_DTMF | DSP_DIGITMODE_RELAXDTMF);
+ }
/* Set file descriptors for audio, video, realtime text and UDPTL as needed */
if (i->rtp) {
@@ -6087,12 +6095,20 @@ static struct ast_frame *sip_rtp_read(struct ast_channel *ast, struct sip_pvt *p
ast_set_write_format(p->owner, p->owner->writeformat);
}
- if (f && (ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) && p->vad) {
- f = ast_dsp_process(p->owner, p->vad, f);
- if (f && f->frametype == AST_FRAME_DTMF) {
- if (ast_test_flag(&p->flags[1], SIP_PAGE2_T38SUPPORT) && f->subclass == 'f') {
- ast_debug(1, "Fax CNG detected on %s\n", ast->name);
- *faxdetect = 1;
+ if (f && ((ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) || ast_test_flag(&p->flags[1], SIP_PAGE2_FAX_DETECT)) && p->dsp) {
+ f = ast_dsp_process(p->owner, p->dsp, f);
+ if (f && f->frametype == AST_FRAME_DTMF) {
+ if (f->subclass == 'f') {
+ if (option_debug)
+ ast_log(LOG_DEBUG, "Fax CNG detected on %s\n", ast->name);
+ *faxdetect = 1;
+ /* If we only needed this DSP for fax detection purposes we can just drop it now */
+ if (ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) {
+ ast_dsp_set_features(p->dsp, DSP_FEATURE_DTMF_DETECT);
+ } else {
+ ast_dsp_free(p->dsp);
+ p->dsp = NULL;
+ }
} else {
ast_debug(1, "* Detected inband DTMF '%c'\n", f->subclass);
}
@@ -6113,20 +6129,26 @@ static struct ast_frame *sip_read(struct ast_channel *ast)
fr = sip_rtp_read(ast, p, &faxdetected);
p->lastrtprx = time(NULL);
- /* If we are NOT bridged to another channel, and we have detected fax tone we issue T38 re-invite to a peer */
- /* If we are bridged then it is the responsibility of the SIP device to issue T38 re-invite if it detects CNG or fax preamble */
- if (faxdetected && ast_test_flag(&p->flags[1], SIP_PAGE2_T38SUPPORT) && (p->t38.state == T38_DISABLED) && !(ast_bridged_channel(ast))) {
- if (!ast_test_flag(&p->flags[0], SIP_GOTREFER)) {
- if (!p->pendinginvite) {
- ast_debug(3, "Sending reinvite on SIP (%s) for T.38 negotiation.\n", ast->name);
- change_t38_state(p, T38_LOCAL_REINVITE);
- transmit_reinvite_with_sdp(p, TRUE, FALSE);
- }
- } else if (!ast_test_flag(&p->flags[0], SIP_PENDINGBYE)) {
- ast_debug(3, "Deferring reinvite on SIP (%s) - it will be re-negotiated for T.38\n", ast->name);
- ast_set_flag(&p->flags[0], SIP_NEEDREINVITE);
- }
- }
+ /* If we detect a CNG tone and fax detection is enabled then send us off to the fax extension */
+ if (faxdetected && ast_test_flag(&p->flags[1], SIP_PAGE2_FAX_DETECT)) {
+ ast_channel_lock(ast);
+ if (strcmp(ast->exten, "fax")) {
+ const char *target_context = S_OR(ast->macrocontext, ast->context);
+ ast_channel_unlock(ast);
+ if (ast_exists_extension(ast, target_context, "fax", 1, ast->cid.cid_num)) {
+ ast_verbose(VERBOSE_PREFIX_2 "Redirecting '%s' to fax extension\n", ast->name);
+ pbx_builtin_setvar_helper(ast, "FAXEXTEN", ast->exten);
+ if (ast_async_goto(ast, target_context, "fax", 1)) {
+ ast_log(LOG_NOTICE, "Failed to async goto '%s' into fax of '%s'\n", ast->name, target_context);
+ }
+ fr = &ast_null_frame;
+ } else {
+ ast_log(LOG_NOTICE, "Fax detected but no fax extension\n");
+ }
+ } else {
+ ast_channel_unlock(ast);
+ }
+ }
/* Only allow audio through if they sent progress with SDP, or if the channel is actually answered */
if (fr && fr->frametype == AST_FRAME_VOICE && p->invitestate != INV_EARLY_MEDIA && ast->_state != AST_STATE_UP) {
@@ -21082,6 +21104,9 @@ static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask
} else if (!strcasecmp(v->name, "constantssrc")) {
ast_set_flag(&mask[1], SIP_PAGE2_CONSTANT_SSRC);
ast_set2_flag(&flags[1], ast_true(v->value), SIP_PAGE2_CONSTANT_SSRC);
+ } else if (!strcasecmp(v->name, "faxdetect")) {
+ ast_set_flag(&mask[1], SIP_PAGE2_FAX_DETECT);
+ ast_set2_flag(&flags[1], ast_true(v->value), SIP_PAGE2_FAX_DETECT);
} else
res = 0;
@@ -22301,6 +22326,7 @@ static int reload_config(enum channelreloadreason reason)
ast_clear_flag(&global_flags[1], SIP_PAGE2_VIDEOSUPPORT);
ast_clear_flag(&global_flags[1], SIP_PAGE2_TEXTSUPPORT);
ast_clear_flag(&global_flags[1], SIP_PAGE2_IGNORESDPVERSION);
+ ast_clear_flag(&global_flags[1], SIP_PAGE2_FAX_DETECT);
/* Read the [general] config section of sip.conf (or from realtime config) */
for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
@@ -23173,14 +23199,14 @@ static int sip_dtmfmode(struct ast_channel *chan, void *data)
if (p->rtp)
ast_rtp_setdtmf(p->rtp, ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_RFC2833);
if (ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) {
- if (!p->vad) {
- p->vad = ast_dsp_new();
- ast_dsp_set_features(p->vad, DSP_FEATURE_DTMF_DETECT);
+ if (!p->dsp) {
+ p->dsp = ast_dsp_new();
+ ast_dsp_set_features(p->dsp, DSP_FEATURE_DTMF_DETECT);
}
} else {
- if (p->vad) {
- ast_dsp_free(p->vad);
- p->vad = NULL;
+ if (p->dsp) {
+ ast_dsp_free(p->dsp);
+ p->dsp = NULL;
}
}
sip_pvt_unlock(p);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 19:00:15 +0000