Yealink W70B

I am trying to find out if I can use a DECT IP Base station with the Comcast Business service.

Here is what I have for service: Voice Package, Including Business Internet Gigabit Extra, 1 Mobility Voice Line, and SecurityEdge.

My plan is to use the W70B DECT IP Base Station in the IT Closet, with a Yealink T54W IP phone and a Yealink CP930W Conference DECT IP Phone.

The manual for my modern, Technicolor CGA4332, states the following:

"Eight Telephone ports - The CGA4332 supports up to eight traditional phones or DECT base stations to connect to the gateway. Single-line customers can use the Tel 2/Alarm port to connect an auto-dial alarm system."

But the DECT station is ethernet (RJ45), and the Comcast Business instruction plug the phone to one of the telephone jacks in the modem instead of Ethernet.