Even though the Motorola SBV6220 telephony DOCSIS 3.0 modem isn't on the approved list, would it work with Comcast telephony service in the Chicago area? I currently have Blast level service and an Arris TM502, which isn't listed for Blast, and I've been thinking of just going out and buying my own modem, but I also have CDV. Would the SBV6220 work?
The current consensus is that the only customer-owned telephony modem approved by Comcast is the Arris TM722G, which you must purchase from your local Best Buy (if available) that has a Comcast Communications Center/kiosk. About $150 for the modem plus professional installation. Some stores/areas will allow a "self install". Those may supply a kit that looks like this;