Hi there, Is it possible to configure 3CX on Iphone to work as an external extension of an 3CX Phone System connecting through 3G? I've configured the external extension on 3CX phone system, as well as the STUN and Tunnel settings. On the iphone, I configured the external server as the 3cx phone system public IP. The port is 5090, and the stun server is stun3.3cx.com. Also, the "use external server" is on. In the proxy field, I don't really have a clue on what IP address to use, since I don't have an remote proxy. In the server log, the iphone don't seem to be even trying to register. Am I missing something? Could someone help me?