We have a Verizon SIP trunk terminated on a 3845 router running 12.4(22)T IOS and sending calls to CUCM 7.0.
The trunk is SIP from 3845 to CUCM. We are transcoding most of the inbound calls from 729 to 711.
After a number of days (no set pattern), the router locks up and there not even console access.
I can see the ethernet and serial ports are showing up, and ethernet ports are showing activity, but there is no access to the box at all.
Only access is to reload.
This same router was working fine for months with no problem before the upgrade from Call Manager 4.x to CUCM 7.0.
Same number of calls same everything.
Prior to the upgrade, the SIP was the same, same router hardware, same config.
Per Verizon they will only support IOS 12.4(20)T, so we had that prior to CUCM upgrade, but have tried that IOS since upgrade and still router locks up.
Both Verizon and Cisco are saying they have no idea why this is happening
Once thing we have noticed on "sh sccp stat" is that over time the StopMediaTransmission counters are showing 0 sucessful stops, and transmissions accumulate over time.
StartMediaTransmission rx 86108, successful 86108, failed 0
StopMediaTransmission rx 86062, successful 0, failed 0
I happened to take the above snapshot a couple of hours prior to the lock up, and then looked after reboot and all counters are showing 0.
Are the sccp channels staying open and possible causing a memory leak over time?