The NETGEAR Nighthawk CM1150V XFINITY Voice cable modem was made only for Comcast customers. The CM1150V provides for speeds up to 2 Gbps, making it future proof for many years to come. Also, it is backward compatible with DOCSIS 3.0. Furthermore, the Netgear CM1150V can support 2 separate phone lines and many calling features like Caller ID and Call waiting. The perfect modem for XFINITY Double & Triple Play package deals.