Say dialing *555 and VOIPo would say:
For the last incoming call <234-437-9876>
Press 1 for Whitelist
Press 2 for Blacklist
Press 3 for Voicemail
Press 4 for Busy Signal
Press 5 for Disconnected
Press 6 to Exit

Then
You selected 3 Voicemail
Press 3 again to accept
Any other key to cancel