Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 15019)
+++ channels/chan_sip.c	(working copy)
@@ -715,6 +715,7 @@
 	int stateid;
 	int laststate;				/*!< Last known extension state */
 	int dialogver;
+	int sendonly;				/*!< Sendonly stream state (RFC 3264) */
 	
 	struct ast_dsp *vad;			/*!< Voice Activation Detection dsp */
 	
@@ -3576,7 +3577,6 @@
 	int codec;
 	int destiterator = 0;
 	int iterator;
-	int sendonly = 0;
 	int x,y;
 	int debug=sip_debug_test_pvt(p);
 	struct ast_channel *bridgepeer = NULL;
@@ -3719,11 +3719,11 @@
 	while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
 		char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
 		if (!strcasecmp(a, "sendonly")) {
-			sendonly=1;
+			p->sendonly=1;
 			continue;
 		}
 		if (!strcasecmp(a, "sendrecv")) {
-		  	sendonly=0;
+		  	p->sendonly=0;
 		}
 		if (sscanf(a, "rtpmap: %u %[^/]/", &codec, mimeSubtype) != 2) continue;
 		if (debug)
@@ -3791,7 +3791,7 @@
 	if ((bridgepeer=ast_bridged_channel(p->owner))) {
 		/* We have a bridge */
 		/* Turn on/off music on hold if we are holding/unholding */
-		if (sin.sin_addr.s_addr && !sendonly) {
+		if (sin.sin_addr.s_addr && !p->sendonly) {
 			ast_moh_stop(bridgepeer);
 		
 			/* Activate a re-invite */
@@ -3800,7 +3800,7 @@
 			/* No address for RTP, we're on hold */
 			
 			ast_moh_start(bridgepeer, NULL);
-			if (sendonly)
+			if (p->sendonly)
 				ast_rtp_stop(p->rtp);
 			/* Activate a re-invite */
 			ast_queue_frame(p->owner, &ast_null_frame);
@@ -4637,6 +4637,9 @@
 				    debug);
 	}
 
+	if (p->sendonly == 1)
+		ast_build_string(&a_audio_next, &a_audio_left, "a=recvonly\r\n");
+
 	ast_build_string(&a_audio_next, &a_audio_left, "a=silenceSupp:off - - - -\r\n");
 
 	if ((m_audio_left < 2) || (m_video_left < 2) || (a_audio_left == 0) || (a_video_left == 0))