<html>I use Sipwise C5 CE 8.2.1 with my topo like this:<br />SIP client => NAT => Internet = > NAT => Sipwise<br />SIP Clients can call together well.<br />But if I call to SIP account that don't have in my system or call to wrong SIP number, nothing happened. I've setup sound set for my domain.<br /><br />Do you have any advice?</html>