/mcpnetwork 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 monitor this via the CPU Pegging Alert in RTMT). 7 InitializationError - An internal error occurred within Unified CM while processing the device registration. Cisco recommends that you restart the Cisco CallManager service. If this issue occurs repeatedly, collect SDL/SDI detailed traces with "Enable SIP Keep Alive (REGISTER Refresh) Trace" and "Enable SCCP Keep Alive Trace" under Cisco CallManager services turned on and contact the Cisco Technical Assistance Center (TAC). 10 AuthenticationError - The device failed either TLS or SIP digest security authentication. If the device is a SIP phone and is enabled for digest authentication (on the System > Security Profile > Phone Security Profile, check if "Enable Digest Authentication" checkbox is checked), verify that the information in the Digest Credentials field on the End User Configuration page is configured. Also, check the Phone Configuration page to determine whether the phone is associated with the specified end user in the Digest User drop box. If the device is a third-party SIP device, verify that the digest credentials configured on the phone match the Digest Credentials configured in the End User Configuration page. 11 InvalidX509NameInCertificate - Configured "X.509 Subject Name" doesn't match the information in the certificate from the device. Check the Security profile of the indicated device and verify that the Device Security Mode is set to either Authenticated or Encrypted. Verify that the X.509 Subject Name field has the appropriate content; it should match the Subject Name in the certificate from the peer. 12 InvalidTLSCipher - Unsupported cipher algorithm used by the device; Unified CM only supports AES_128_SHA cipher algorithm. Recommended 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 164/343