diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index f0253d0..3441d0f 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -391,6 +391,8 @@ route[SANITY_CHECK]
 
     if ($ua == "friendly-scanner" ||
         $ua == "sundayddr" ||
+        $ua == "pplsip" ||
+        $ua =~ "NiceGuy" ||
         $ua =~ "sipcli" ) {
         xlog("L_WARN", "$ci|end|dropping message with user-agent $ua from $si:$sp\n");
         exit;