“I have a NetGear Nighthawk AC1900 WiFiCable Modem Router (C7000-100NAS) that I purchased from Best Buy last year. I've added VOICE (telephony) to my XFinity account. What do I need to work with my existing modem/router to let me add the Voice option?”

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• Unfortunately, I think you're going to need to purchase a voice-compatible cable modem. I do not believe the VOIP provisioned by Xfinity otherwise, unless you essentially have the coax cable passing into a first device for voice (only) with a coax pass-through to your current cable modem for internet. Check here for Xfinity authorized devices: https://www.xfinity.com/support/articles/list-of-approved-cable-modems

  I would recommend:

  • 
    NETGEAR - Nighthawk 32 x 8 DOCSIS 3.1 Voice Cable Modem, Voice support - Black

    Rating: 4.4 out of 5 stars with 796 reviews

    4.4(796)

  Answered by MCSmo 5 years ago

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