I just bought a NetGear CM 500 modem which is compatible with Xfinity service to replace the one I am renting from Xfinity. However, there is no port on the back for a phone line. It has a Cable/Internet, Ethernet and power port but no phone jack. Can I use this modem or do I have to get something else?
Sounds like you bought a cable modem and you need a DSL modem. They are different types.
I believe that they are talking about needing an eMTA ?