--- chan_sip.c_before_dtmf_fix	2012-09-05 17:33:16.000000000 +0200
+++ chan_sip.c	2012-09-10 17:35:19.000000000 +0200
@@ -1289,6 +1289,7 @@
 /*---------------------------- Forward declarations of functions in chan_sip.c */
 /* Note: This is added to help splitting up chan_sip.c into several files
 	in coming releases. */
+static int  _dtmf_timeout(void * data);
 
 /*--- PBX interface functions */
 static struct ast_channel *sip_request_call(const char *type, struct ast_format_cap *cap, const struct ast_channel *requestor, const char *dest, int *cause);
@@ -3163,6 +3164,11 @@
 	if (dialog->t38id > -1) {
 		AST_SCHED_DEL_UNREF(sched, dialog->t38id, dialog_unref(dialog, "when you delete the t38id sched, you should dec the refcount for the stored dialog ptr"));
 	}
+	if (dialog->dtmf_timeout > -1)
+	{
+		AST_SCHED_DEL_UNREF(sched, dialog->dtmf_timeout, dialog_unref(dialog, "when you delete the dtmf_timeout timer sched, you should dec the refcount for the stored dialog ptr"));
+
+	}
 
 	if (dialog->stimer) {
 		stop_session_timer(dialog);
@@ -7035,6 +7041,13 @@
 		res = -1; /* Tell Asterisk to generate inband indications */
 		break;
 	case SIP_DTMF_RFC2833:
+		ast_debug (1,"Inside sip_senddigit_begin to emulate DTMF begin");
+		if (p->dtmf_timeout > -1)
+		{	
+			AST_SCHED_DEL_UNREF(sched, p->dtmf_timeout, dialog_unref(p, "when you delete the dtmf_timeout timer sched, you should dec the refcount for the stored dialog ptr"));
+
+		}
+		p->dtmf_timeout=ast_sched_add(sched, (unsigned int)100 + 10, _dtmf_timeout, dialog_ref(p, "setting ref as passing into ast_sched_add for _dtmf_timeout"));
 		if (p->rtp)
 			ast_rtp_instance_dtmf_begin(p->rtp, digit);
 		break;
@@ -8256,6 +8269,7 @@
 	p->sessionversion_remote = -1;
 	p->session_modify = TRUE;
 	p->stimer = NULL;
+	p->dtmf_timeout = -1;
 	p->prefs = default_prefs;		/* Set default codecs for this call */
 	ast_copy_string(p->zone, default_zone, sizeof(p->zone));
 	p->maxforwards = sip_cfg.default_max_forwards;
@@ -33213,6 +33227,23 @@
 	return 0;
 }
 
+static int  _dtmf_timeout(void * data)
+{
+	ast_debug(1, "Inside _dtmf_timeout");
+        struct sip_pvt *p = (struct sip_pvt *)data;
+	sip_pvt_lock(p); /* It locks both the channel and dialog */
+	/* Reset the timer object */
+	p->dtmf_timeout = -1;
+	struct ast_channel* bridged = ast_bridged_channel(p->owner);
+        sip_pvt_unlock(p);
+	if (bridged)
+	{
+        	ast_log(LOG_DTMF, "dtmf timeout, sending null to clear\n");
+        	ast_queue_frame(bridged, &ast_null_frame);
+	}	
+        return 0;
+}
+
 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Session Initiation Protocol (SIP)",
 		.load = load_module,
 		.unload = unload_module,