Xfinity branded TG862G in bridge mode for voice calls?

Hi,

My Xfinity branded TG862G is around 5 years old. I keep getting emails from xfinity to upgrade my modem (am on a 250Mbps plan) . I just bought the Netgear CM600 which does not have voice (tel) ports. Can I use my TG862G in bridge mode just for voice and connect it to the CM600? I have an ASUS wireless router that today I connect to the TG862G and now I plan to connect to the CM600.

Thanks for any technical input on whether this setup will work.

-MK