I've just got the above phone and it is working fine for voice.
However, when I try to access another company's voice conference system I can't use the number pad to enter the codes.
I can access the menu system of Voipfone's voicemail system.
I 've currently got the default settings of:
- Automatic Negotiation of DTMF Transmission: No
- Send Settings for DTMF Transmission: RFC 2833