Fixed force RTP through the engine

kamailio.cfg

@@ -200,7 +200,7 @@ branch_route[MANAGE_BRANCH] {
 onreply_route[MANAGE_REPLY] {
     if (is_method("INVITE")) {
         # Force RTP relay on reply
-        rtpengine_manage("force-relay");
+        rtpengine_manage("replace-origin force-relay");
 	xdbg("incoming reply\n");
 	}
 }