early return for in-dialog transactions

kamailio/default.cfg

@@ -732,6 +732,11 @@ failure_route[INTERNAL_FAULT]
         exit;
     }
 
+    if (!is_method("INVITE") ||  has_totag()) {
+       xlog("L_INFO", "$ci|failure|internal reply $T_reply_code $T_reply_reason\n");
+       return;
+    }
+
     # Handle redirects
     if (t_check_status("302")) {
         $var(redirect) = @from.uri.user + "@" + @from.uri.host + "->"