I’ve just diagnosed an issue a customer had getting a Voipfone SIP trunk Registered on a SnomONE PBX.
The trick to getting this to work is:
- Turn on long SIP headers. Go to the admin, general settings page and set “Use Short SIP Headers” to “long”
- If you are using IP access control then you need to enable the IP range 220.127.116.11 – 18.104.22.168 to ensure Voipfone will work