I have a customer that has been plagued with an annoying problem for a couple months now. We have had a TAC case open with Cisco and haven't been able to get anywhere with them. Here is the issue.
Periodically (at least once a day), a small group of phones registered to CUCM 7.0.2 reboot themselves with no administrator involvment. Now at first I thought it was a network problem (missing keepalives), but further investigation into the QoS configuration showed that there were no packet drops in the priority or call control queues and that MOS scores throughout the network were averaging 4.43 with a low score of 4.3. Second I considered the possibility of a firmware bug (8-5-2s) however the issue happens to different phones everyday and not necessarily the SAME phones. The issue moves around the network affecting different phones one day and other phones another day. The only thing that we have been able to identify is that the syslogs show transient connection errors and it seems to be around 9:00AM and 9:00PM when the phones lose connection. Any ideas that anyone might have are GREATLY appreciated. Thanks for taking the time to read and consider.
I came across this when looking for another problem. Did you resolve the issue?
We had a similar issue when the DHCP lease time was set to anything other than infinite.