Index: chan_sip.c
===================================================================
--- chan_sip.c	(revision 316037)
+++ chan_sip.c	(working copy)
@@ -13261,6 +13261,34 @@
 	int start = 0;
 	int wildcard_found = 0;
 	int single_binding_found = 0;
+	
+	
+	
+	/* check if we have already a tcp connection */
+	if(!ast_sockaddr_isnull(&peer->addr) && peer->socket.type != SIP_TRANSPORT_UDP){
+		/* if the remote address is not me, close this tcp helper thread */
+		if(ast_sockaddr_cmp_addr(&peer->addr, &pvt->recv)){
+			if (peer->socket.tcptls_session) {
+				struct sip_threadinfo *th;
+				
+				struct sip_threadinfo tmp = {
+					.tcptls_session = peer->socket.tcptls_session,
+				};
+				
+				/* search for the tcp_helper_thread */
+				th = ao2_t_find(threadt, &tmp, OBJ_POINTER, "ao2_find, getting sip_threadinfo in tcp helper thread");				
+				if(th){
+					/* stopping the thread also closes socket an destroy it */
+					ao2_t_ref(th, -1, "Decrementing threadinfo from callback");
+					pthread_t thread = th->threadid;
+					th->stop = 1;
+					pthread_kill(thread, SIGURG);
+					pthread_join(thread, NULL);
+				}
+			}
+		}
+	} /* end; search for older tcp connection */
+	
 
 	ast_copy_string(contact, __get_header(req, "Contact", &start), sizeof(contact));