Hi, I'm not a "techie" and I have a question that probably has a logical solution other than just using an Xfinity modem. I bought this great modem-router and it gives great service on Xfinity internet. However, I also subscribed to Xfinity Voice as AT&T is not available in my area (I'm old school and want a phone line other than just my cell). Now I come to understand that I cannot have Xfinity Voice if I want to keep my expensive Nighthawk modem-router. The issue is that the Nighthawk modem-router only has 5 Ethernet ports and I need a modem with a voice/phone (rj11) port to connect a phone. I see there are RJ11 (F) to RJ45 (M) adapters out there, but will this work with my modem and get me Xfinity voice service? If not, does anyone know of someone who's resolved this issue? I've scoured all the Xfinity blogs and no-one has a solution other than paying $14/month for an Xfinity modem.

To use xfinity voice, you need an xfinity compatible modem. Getting an adapter won't work.

Nighthawk AC3200 Model C7800 not capable of Xfinity Voice

plemans
Guru - Experienced User
May 02, 2021
You can't simple put an rj45 to rj11 adapter in and get voice. I wish it was that simple.
Options?
1. get a modem/voice device like the cm1150v or the cm2050v and then buy a router seperate. Then you'd have voice.
There is the C7100V that also integrates modem/voice/router but its only docsis 3.0
2. You don't have to use xfinity voice. There's other VOIP options. You could go with something like Ooma that is a voip service option and tends to be cheaper than xfinity voice anyway.
- Brucep7
  Tutor
  May 02, 2021
  Thanks Plemans. The Oomans looks like a possible solution without having to buy more equipment (except the Ooman phone).
  
  I came across an Ethernet phone on Amazon. Will this phone work with Xfinity Voice thru the C7800 Cable Modem?
  - plemans
    Guru - Experienced User
    May 02, 2021
    To use xfinity voice, you need an xfinity compatible modem. Getting an adapter won't work.
Brucep7
Tutor
May 02, 2021
I came across an Ethernet phone on Amazon. Will this phone work with Xfinity Voice thru the C7800 Cable Modem?