I get a bunch, between 10 and 20, phone that unregister. If I look in the CCM event logs under application I see the following...
Error: DeviceUnregistered - Device unregistered.
Device name.: SEPXXXXXXXXXXXX
Device IP address.: 10.XX.XX.XX
Device type. [Optional]: 308
Device description [Optional].: San Conference room-xxxxxxxx
Reason Code [Optional].: 8
App ID: Cisco CallManager
Cluster ID: NPPUB-Cluster
Node ID: 10.XX.XX.XX
Explanation: A device that has previously registered with Cisco CallManager has unregistered. This event may be issued as part of normal unregistration event or due to some other reason such as loss of keepalives.
Recommended Action: No action is required if unregistration of this device was expected..
I looked up reason code 8 and it says
What can I look at to correct this problem or what would or could be causing this?