Encode SIP username

When constructing reg_success routing key, realm and username need encoding before building the routing key.

kamailio/registrar-role.cfg

@@ -146,7 +146,7 @@ route[ATTEMPT_AUTHORIZATION]
 
     $var(amqp_payload_request) = '{"Event-Category" : "directory", "Event-Name" : "reg_success", "Contact" : "' + $var(fs_contact) + '", "Call-ID" : "' + $ci + '", "Realm" : "' + $fd + '", "Username" : "' + $fU + '", "From-User" : "' + $fU + '", "From-Host" : "' + $fd + '", "To-User" : "' + $tU + '", "To-Host" : "' + $td + '", "User-Agent" : "' + $ua + '" ,' + $var(register_contants) + ' }';
 
-    $var(amqp_routing_key) = "registration.success." + $(fd{kz.encode}) + "." + $fU;
+    $var(amqp_routing_key) = "registration.success." + $(fd{kz.encode}) + "." + $(fU{kz.encode});
 
     kazoo_publish("callmgr", $var(amqp_routing_key), $var(amqp_payload_request));