I have an odd problem.
I have a 7921, which registers as it should in an CUCME 8.6 environment.
4 ephones, (3) 7975G and (1) 7921. One incoming / outgoing pots line. No voip.
calls made from the 7921 to internal extensions work perfectly. Audio in both directions.
Calls made from the 7975's to internal extensions and external numbers work perfectly - audio in both directions.
Calls made from the 7921 to external numbers, however, have no outgoing audio. Inbound audio works fine.
Any ideas? Config is attached