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UPDATE - We have determined that the system fails when the call reference number (from the ISDN debug traces) reaches 0x8300 (768 calls). At this point, outbound calls to the Nortel 61c fail. When CallManager service is restarted, the reference number resets. This allows outbound calls to...

Yes - SR1 is installed. Debug on router shows: Cause i = 0x81AF1A01 - Resource Unavailable, unspecified This occurs on all outbound calls until CallManager service is restarted. Nortel is set to RRB, where Cisco is set to top down. Is it possible that this is a channel conflict?

The file looks fine to me. URL is correct. I assume: 1. The case of the files is correct 2. You have copied this to all TFTP servers 3. You have restarted the TFTP Service.

Unfortunately we do not have a license for QSIG on the Nortel System.

Thanks for the reply. It is not a QSIG Trunk - plain PRI. It is Succession 3.0, and CallManager 4.2.

Isn't the 7961 supposed to be: 320x196x4 ? The 7970 is 320x212x12 ... The XML looks fine.

Overview: PSTN ---> Nortel Option 61c ----> T1 MGCP C2821 -----> CallManager Issue: 1. At a random time interval (approximately once per 24 hours), CallManager subscribers are unavailable to place calls through the 2821 to the PSTN/Nortel devices. At the same time, Incoming calls are routed...