I configured all correclty, checked STUN server if works, then ExpressTalk completely IGNORES all configurations about Public IP recognition.
I tried also to insert manually the public IP, but nothing...
this is the log:
18:35:54 SIP Private IP is: 39.7.143.200:5060
18:35:54 SIP Public IP is: 39.7.143.200:5060
39.7.143.200 is my LAN IP address, not public...