I do not have a Tberd, unfortunately.

The T1 card was previously used for a T1 (not PRI) less than a year ago. The PBX was switched to POTS lines, now to back to the T1 card, but with a PRI this time.

There is no Adtran in use.

I'm thinking it's a config issue on the PBX. The vendor reused the config from prior T1 circuit for the current PRI circuit, and I had issues getting that working from the beginning. Now this issue has come up. It was a COS setting that got the circuit working. Anything else in there that would be different between a T1 vs a PRI?

Thanks.