RTMT(REAL TIME MONITORING TOOL)===============================Phone registration issues in RTMTRTMT-->system--->Syslog Viewer-->Select the Node to which Phone registered----> Application Log--->Filter the time to check messageRTMT > go to Syslog viewer > Select the Node where the phone got registered > click on the Application Logs or Get console logs of ip phone to check what happened. In logs ReasonForOutOfService value will show you the exact reason why the phone rebooted or check EndPointUnregistered keyword in logs.If you need to get logs for IP phone registration issue then collect the Event viewer application logs from RTMT (Select call manager on 1st page of log selection window and select Event viewer application logs on 2nd page in RTMT) and analyze syslog.Reason code 8 means a device initiated reset, so the device reset itself for some reason and reason code 9 means that the device reset was initiated from the CUCM.The Session Manager logs the call data in new log files. These new log files are located in the following folder: /var/log/active/cm/trace/ccm/calllogs/.Session Trace Log View is used to Live tracing of Calls based on Calling and Called NumberDatabase SummaryRTMT-->Service-->Database Summary