--- ./res/res_pjsip_sdp_rtp.c.orig	2017-03-10 14:35:54.023556130 +1100
+++ ./res/res_pjsip_sdp_rtp.c	2017-03-10 16:41:19.036036397 +1100
@@ -179,6 +179,14 @@
 	if (session->endpoint->media.bind_rtp_to_media_address && !ast_strlen_zero(session->endpoint->media.address)) {
 		ast_sockaddr_parse(&temp_media_address, session->endpoint->media.address, 0);
 		media_address = &temp_media_address;
+	} else {
+		struct ast_sip_transport *transport = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "transport", session->endpoint->transport);
+		if (transport && transport->state) {
+			char hoststr[PJ_INET6_ADDRSTRLEN];
+			pj_sockaddr_print(&transport->state->host, hoststr, sizeof(hoststr), 0);
+			ast_debug(1, "Transport: %s bound to host: %s, using this for media.\n", session->endpoint->transport, hoststr);
+			ast_sockaddr_parse(media_address, hoststr, 0);
+		}
 	}
 
 	if (!(session_media->rtp = ast_rtp_instance_new(session->endpoint->media.rtp.engine, sched, media_address, NULL))) {