/mcpcorrect the IP address and press Apply; the phone should restart automatically. If you are using a Load server to serve configuration file, check the IP address or hostname on the Phone Configuration page in Cisco Unified CM Administration for the phone identified in this alarm, to ensure that the information is accurate. If it is not, update the IP address or hostname and restart the phone. Also, verify that network connectivity exists between the phone and the Load server or TFTP server. Restart the phone to attempt connection again unless the restart occurs automatically. 11 Specified CTL file is not found on the TFTP server. Check that file name is correct and file exist on TFTP server. 12 Authentication for CTL file failed; reset the phone to correct the issue 13 The Load server or TFTP server could not process the phone's configuration file download request. It's possible that congestion is causing a delay in TFTP response. To allow the phone to attempt the download again, wait a few minutes then reset the phone. The phone will attempt to download its configuration file again. If resetting the phone does not solve the issue, restart the Load server or TFTP server (whichever server provides configuration file). 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 319/343