tweak

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3736 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_dingaling/mod_dingaling.c

@@ -698,6 +698,10 @@ static int activate_rtp(struct private_object *tech_pvt)
 		return 1;
 	}
 
+    if (!(tech_pvt->remote_ip && tech_pvt->remote_port)) {
+        return 0;
+    }
+
 	if (switch_core_codec_init(&tech_pvt->read_codec,
 							   tech_pvt->codec_name,
 							   NULL,