I have 3cx installed on windows 2003 server. If the internal phones are inbound there arent problems. But If I connect in outbond (over internet) i do not ear nothing . I have tried with x-lite. Es: server is xxxxxx.dyndns.org and the ports are all open the client is Display Name: 101 User Name: 101 Password: correct password for 101 domain: xxxxxx.dyndns.org stun server: stun.3cx.com Where a wrong ? When I call from client external o internal line I ear but the destinatary do not ear me.