Thanks for responding. The 'compatibility page' that I mentioned above is the same URL that you supplied.
The problem is that on that list, the ones that support what I need (both dual band and voice), are no longer available - except for the ArrisTG1682G - which is why I was asking about that one in particular.
I was hoping that somebody here had found a suitable replacement for the Cox-supplied rental unit.
Oh well - I guess I'll either keep on looking, or maybe give up my land line. Which is one step closer to cutting the cable.
