I have an Xfinity gateway router. I have Internet, TV, and telephone service.
I already have a line connected from the RJ-11 POTS port on the gateway to the RJ-11 jack on the wall. That all works.
Now I want to also plug in a Cisco 7281 IP phone into the gateway router without disabling the POTS ports. That means I want this IP phone to be an extension of the same number, just like the other analog phones in the house.
1. Is there any setup parameters that I have to program into the phone?
2. Is there information that I have to provide to Comcast in order to activate this phone?
3. Will I be able to add additional IP phones in the future that all work as an extension of the same number?
Cisco IP phones only work with a PBX system. You need to configure one of those first. I suggest RasPBX on a raspberry pi. You will need a SIP trunk from comcast business to use.