Update:

Issue appears to be with the interface between the DMS 100 Central Office Switch and the OS 7100. We're in the old BellSouth footprint so we see a lot of DMS connections.

We are able to ask AT&T to "bounce" the circuit or force the D Channel and it will pop right up. Otherwise takes around 1 and 1/2 hours to come up on its own. Once it's up it works properly until you need to power down or reset the system.

For those that asked there is an Adtran CSU between the smart jack and the OS 7100.

Thanks for all the input.