NETGEAR Nighthawk Ultra-High Speed Cable Modem for XFINITY Voice (CM1150V) delivers gigabit speed cable internet and the best call clarity. This high-performance DOCSIS 3.1 cable modem supports all of todays internet service plans and is designed for the fastest internet speed tiers in near future. CM1150V includes two telephones ports that automatically prioritize voice over internet for clear and uninterrupted calls. Enhanced call features include 3-way conference calling, caller ID, call forwarding and more. Gigabit Ethernet ports (with LAN port aggregation) for faster wired connections. Easily install this modem with a service call and save up to $156 per year on monthly cable modem rental fees.