I gave a phone to my boss to take to Dubai, its set for Dhcp and everything. I also set external extension and bind to media server in the 3CX system, but for some reason the phone will not register, not even try to register, I see nothing in the system logs about the phone connecting. But it will connect to the tftp server on the same box, under the same IP address as the 3CX, and I can telnet into the phone. So I know the phone can connect to my server, and I can connect to the phone, but the phone just will not register with 3CX. I have tried multiple ports, even high number ports, and nothing. The phone has registered as an external extension before, so I know the phone works. Any Ideas?