filter log for external reply

kamailio/default.cfg

@@ -639,7 +639,9 @@ route[EXTERNAL_TO_INTERNAL_RELAY]
 
 onreply_route[EXTERNAL_REPLY]
 {
-    xlog("L_INFO", "$ci|log|external reply $T_reply_code $T_reply_reason\n");
+    if ($rs < 300) {
+        xlog("L_INFO", "$ci|log|external reply $T_reply_code $T_reply_reason\n");
+    }
 
     if($rs == 100) {
         if($sel(cfg_get.kazoo.use_progressive_timers) == 1) {