[USR-TC] Channelized T1 in a DSP

Anyone using a Channelized T1 into a DSP? We have a TC boxes with PRI's into the DSP's running no problem. But in this location we are using a T1 (no PRI tarriff) and cannot get the TC to accept a call. It rings, 3 seconds of silence and then busy. I have swapped complete chassis and all cards, and reset everything to defaults and reconfigured. I have a feeling that there is some setting in the ARC that I am missing that is different between a T1 and a PRI (like modem mapping or something??) I changed the DSP card from "Message Oriented" to "Bit Robbed." But everything else is the same as our PRI chassis. Help??? Wayne Griswold (906) 774-4847