I've done a help desk request about this, perhaps some here can also help.
I've got an AG310 which was setup in NZ and was working. I'm in South Africa for a few days and brought it with me. Here the modem had to be setup for PPPoE with a guest login, then your PC has to be setup with your account loging (with Telkom SA). I got the internet working, but VFX does not register. Am I missing something? If the internet setup works then VFX must also work? The voice tab is still locked, it reports it has sent and received SIP data, the VoIP LED is on, but the phone is engaged all the time.