Added block rule for PortSIP VoIP SDK user agents

(cherry picked from commit 6a27ddb197)

kamailio/default.cfg

@@ -393,6 +393,7 @@ 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;