I got off the phone with TAC and got some information that we were having slips and errors on our PRI circuits. I don't know your level of familiarity with the gateway devices, but I will give you the commands I was able to learn in order to help diagnose our issue and maybe they will help you...
First, they had me telnet/ssh to my gateway router, in my case a 2821 router. From there I logged in and ran the following:
show controllers t1
>> This showed the statistics on my PRI channels which revealed the slips and errors we were experiencing.
Afterwards, we ran:
show network-clocks
>> This showed the order and status of my PRI's network clock to verify they were in proper sync with the circuits.
They looked good for us, but it did reveal that only one of my PRI's was actually being utilized. (Network-clock-select 1 t1 0/0/0), so we enable and go to configure terminal which allowed us to add the second one:
network-clock-select 2 t1 0/0/1
>> This may vary depending on your setup, but essentially it allows your gateway to use that circuit.
From that point, we ran a clear counters from the main prompt and then issued the show controllers t1 command again to verify that the slips were either stopped or continuing. I'm continuing to monitor, but unfortunately it's after business hours, so I likely won't see any issues until tomorrow morning when business picks up again.
Now that said... the appearance of slips/errors on the controller ports is a sign of issues between you and the provider, but it could be anything from cabling issue to circuit issue or internal. For example, my not having the second PRI active may have caused load issues for us... or it could still be an AT&T issue. But, at least with this info it may help you narrow the issue down.
Hope it helps... good luck!
