We have a remote site, fiber-connected with a single 24-port powered switch. I am getting alot of reports of phones spontaeously resetting. When I look at the CCM Syslog, I see the reason code as Keepalive timeouts. However, QoS is configured on this switch and the phone resets are happening one at a time, rather than several at once. Even more bizarre, when I started looking for patterns, I found that only phones that had pulled an odd DHCP IP address are having a problem. No phone with an even numbered IP address has had a problem and every phone with an odd numbered IP has, typically 3 or 4 times a day.
The switch is a 3560-24PS running IPBase 12.2(46). There are no ACL's or firewalls on the voice network. Has anyone seen anything like this before?
I am currently waiting on one of the network engineers to get on-site to manually switch one of the phones to an even address for one of the power users to verify.
We seem to have found the solution. I don't know why, but the issue seems to have been very short lease times on the Cisco Router DHCP Server. We were using 1 hour leases, and the problem has disappeared now that we have increased those lease times to 12 hour leases.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...