said by sapreaper:
Even Comcast under their policy does not allow 2 modems to be connected via the same drop. Again maybe there is lee-way, but even a Comcast authorized contractor states: "If you have two modems, they must have separate connections to the main line tap plate. They can not both exists on the same RG6 coax building drop."
That would mean that a business class customer who had both Internet and voice services would need to have two drops, because none of the officially approved "modems" that are allowed to be used for a business class account have FXS (voice) ports. That restricted modem list means that two modems are required if a business class customer is a CDV subscriber. I really don't think that Comcast is going to run a separate drop just for the voice modem.