I never knew VM did Voip - fair play
FTTP can't do normal POTS. Newest build HFC areas also no normal telephony - saves money on expensive MSANs, copper cabling, cabinets and indeed labour.
Uses the voice ports on the Hub. Rest of the Liberty Global family and every other cable company I'm aware of throughout the world have been doing it this way since they started.
Longer term project is to have that one Hub device terminating all connectivity. No 2-way connectivity to the TV boxes, one-way coax and using the Hub for all IPTV, no POTS telephony, VoIP via Hub. Better for overall network performance and more efficient.
Building better networks, not just faster ones.