New to Landline Phone Service

I don't use it, but I have an original 20th century SW Bell telephone that works like a champ for making and receiving phone calls.  Cox Voice doesn't recognize phone codes keyed with it though. I doubt your phone is that old, so it should work.  I'm not familair with ports on that modem, but a TM3402A requires Tel1 for phone.  If there's another port, try it and see if you get a dial tone.