We have a T.38 faxing server that is having sporadic issues with specific boxes. Naturally, they say it's an issue with the voice connection and not their server. So we need to collect some logs. this is a PRI on a 2900 series router. The PRI is MGCP controlled and the fax server calls are routed to CUCM. In other words, they come in on the same MGCP dial peers as normal calls and then route patterns on the CUCM (10.x) route the appropriate extensions to the fax server's IP address. The fax server uses T.38.
I need to do continuous logging because the issues are sporadic and it may go a day or two without issues, have issues for 30 minutes, then be fine. The fax server can provide exact ANI/DNIS and call times. But I need to be able to go back and get debugs from the problematic call(s).
Should I be running debugs on the gateway (Q.931 and CCAPI) and offloading to a syslog server, pulling debugs from CUCM since the PRI backhauls L3, or something else?
In short, where do I debug and what debugs will help me with these troublesome T.38 calls.
On a side note, this is a new fax server. The old fax server never had these issues and the only difference in the phone system is the IP of the server. Literally, when the new one came online, I just changed the IP of the H323 fax server in CUCM.
