I believe VoiceMail is part of the basic feature set of VFX, right?
So I called the Voice Portal and recorded my name.
But in MyVfx I can't see any way to activate voice mail for that to answer after a number of rings and for voice messages to be forwarded to an e-mail address.
All I can see under Messaging>VoicePortal is:
Use Personalized Name for Auto Attendant and Voice Messaging
Recorded from Voice Portal
Auto-login to Voice Portal when calling from my phone
I've also tried enabling VoiceMail from the VFX Manager. Now I can see the options under "Messaging" but when they just don't get saved. After hitting 'Refresh' all tick boxes and text fields get cleared. Options under Forwarding and Control work fine though.
I've disabled any Call Forwarding option, that would interfere with VoiceMail.