cucm

A phone that has never been registered to Cisco CallManager would be in Unknown status. But, a phone that was registered to the Cisco CallManager at some point of time can be in Unregistered or Unknown status depending on a service parameter in the “RIS Data collector” service. This parameter specifies the RIS database information storage period for any unregistered or rejected device information from the Cisco CallManager service. After the time specified in this parameter expires, Cisco CallManager removes the expired entries during the next RIS database cleanup time (specified in the RIS Cleanup Time of the Day parameter) Default: 3 Minimum: 1 Maximum: 30 Unit: day...