That is exactly my point! If you go to the Arris website, they even have a tech note document on the E-MTA/ATA concerning proper ringing current, but Cox seems to be very dumb about it! They act as if nobody uses "real" ringers (ringers with gongs, not the electronic crap) in phones anymore, a la 2500 sets, or even 1A2 KTS. In fact one Cox tech told me, they were planning to convert the entire system to a VOIP type MTA that sits on the desk, but I don't recall the brand. It may be Motorola. So who knows what kind of ringing supply those will have.
The large Arris Cornerstone E-MTA MAX24 shoe box seems to be much better. It is powered from the cable system. My Irvine client has one of those in the phone room, and have not had any problems with ringing current, but their phone system is a quantity of Vtech 945s and a 984, four line phones.
....JIM....