I've used to work quite a bit with the Newbridge 3624 and a tiny bit with the Carrier Access.
With the Newbridge, you can connect to the "Terminal" port located behind the locked access door.
We would use ProComm and configure it for 9600, N,8,1. The most common voice modules used with that channelbank supported loop start/ground start lines.
I will admit that channelbanks have pretty much disappeared from the scene since most PBX equipment today can connect directly to a T1 & CSU.
