diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index e762dec..23bbd0a 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -397,6 +397,7 @@ route[SANITY_CHECK]
         $ua == "sundayddr" ||
         $ua == "pplsip" ||
         $ua =~ "NiceGuy" ||
+        $ua =~ "PortSIP" ||
         $ua =~ "sipcli" ) {
         xlog("L_WARN", "$ci|end|dropping message with user-agent $ua from $si:$sp\n");
         exit;