add "pass" log to early return

kamailio/default.cfg

@@ -790,6 +790,7 @@ failure_route[INTERNAL_FAULT]
 
     if (!is_method("INVITE") ||  has_totag()) {
        xlog("L_INFO", "$ci|failure|internal reply $T_reply_code $T_reply_reason\n");
+       xlog("L_INFO", "$ci|pass|$si:$sp\n");
        return;
     }