Randomly calls to the receptionist (internal and external), will display on the UCC operator console but the phone does not ring at all. Caller hears a single ringback and then nothing. Call doesn't go to no answer destination of ephone-dn for the receptionist.
I started logging debug ephone error and debug isdn q931 off to a syslog server but don't see anything in the logs to help.
The receptionist pays close attention and is able to see the calls in the operator console and records the time and calling number. I have compared to the q931 debug logs but nothing is standing out.
I have engaged TAC but they have pushed me over to the AAA team do to some random tracebacks for radius buffer overruns (AAA accounting on the router sends call info to the UCC server so realtime phone state info can be seen).
At a total loss on this. I can't figure out why the phone doesn't ring or why it is random.
Has anyone seen this?
Any idea of some other troubleshooting steps I could perform?
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