I'm trying to provision a 3CX phone at work, but It won't register. Same phone, same settings will register at home on PlusNet or on a 4G LTE router. Using a Yealink W70B phone, what I have tried:
1) Factory reset the phone, add the sipgate account to line 1, works fine, at work, home or on a 4G LTE router.
2) Factory reset the phone, auto provision the 3CX account. Won't register at work on my BT business hub. Works at home on my Plusnet router. Works on a 4G LTE router.
3) As 2), but add sipgate to line 2. Sipgate won't work anywhere. On the phone the 2nd line has a red phone with crossed circle symbol and can't be selected.
Firewall on my BT hub is set to allow all outgoing and I can't see any setting that could affect it. The Sipgate account works on the BT hub with the same port number 5060 (only in situation 1 though). Any ideas why the 3CX won't work through the BT hub?
