add extension point for internal to external relay

kamailio/default.cfg

@@ -581,6 +581,8 @@ route[INTERNAL_TO_EXTERNAL_RELAY]
     }
     #!endif
 
+    route_if_exists("CUSTOM_INTERNAL_TO_EXTERNAL_RELAY");
+
     t_on_reply("EXTERNAL_REPLY");
     t_on_failure("EXTERNAL_FAULT");
 
@@ -814,7 +816,7 @@ route[ROUTE_TO_AOR]
        } else {
           xlog("L_INFO", "$ci|end|lookup for AOR $hdr(X-KAZOO-AOR) failed\n");
           append_to_reply("$def(AOR_NOT_SUBSCRIBED_REASON)\r\n");
-          sl_send_reply("480", "Not registered");
+          send_reply("480", "Not registered");
           exit;
        }
     } else if (reg_fetch_contacts("location", "$hdr(X-KAZOO-AOR)", "callee")) {
@@ -826,7 +828,7 @@ route[ROUTE_TO_AOR]
     } else {
        xlog("L_INFO", "$ci|end|user is not registered\n");
        append_to_reply("$def(AOR_NOT_SUBSCRIBED_REASON)\r\n");
-       sl_send_reply("410", "Not registered");
+       send_reply("410", "Not registered");
        exit;
     }
 }