/mcpissues and if you find one, correct the issue. 12 SCCPDeviceThrottling - (SCCP only) The indicated SCCP device exceeded the maximum number of events allowed per- SCCP device. Events can be phone calls, KeepAlive messages, or excessive SCCP or non-SCCP messages. The maximum number of allowed events is controlled by the Cisco CallManager service parameter, Max Events Allowed. When an individual device exceeds the number configured in that service parameter, Unified CM closes the TCP connection to the device; automatic reregistration generally follows. This action is an attempt to stop malicious attacks on Unified CM or to ward off excessive CPU usage. 13 KeepAliveTimeout - A KeepAlive message was not received. Possible causes include device power outage, network power outage, network configuration error, network delay, packet drops, and packet corruption. It is also possible to get this error if the Unified CM node is experiencing high CPU usage. Verify that the device is powered up and operating, verify that there is network connectivity between the device and Unified CM, and verify the CPU utilization is in the safe range (you can 5/24/26, 3:34 AM System Error Messages for Cisco Unified Communications Manager 15 - Cisco https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/err_msgs/15_x/ccmalarms15.html 202/343