My client is having intermittent problems their CM 4.2.3. I think it is a GATEWAY/PRI (2851’s) related. I need some help trouble shooting advice from a CM Gateway standpoint.
There is nothing to obvious in the system logs. When callers call from the outside they get an AT&T message saying (All circuits are busy). Is there anything obvious I can check? This only happened for about an hour yesterday and today from 8:00AM to 9:00AM., and then the (All circuits are busy) message for AT&T disappears. From the logs, the PRI’s are under utilized and never get close to capacity.
When in doubt, check show isdn active. If you see any stuck call, reload is the safest option.
If you have the CUCM traces from that time you can use VLT or triple combo to look at the ISDN messages and the disconnect side and reason.
This really should have been looked into at the time and with debugs in the GWs.
If this helps, please rate