Phone Cannot Authenticate CTL File
Problem
Phone cannot authenticate the CTL file.
Cause
The security token that signed the updated CTL file does not exist in the CTL file on the phone.
Solution
Change the security token in the CTL file and install the new file on the phone.
ITL File Authenticates but Other Configuration Files Do Not Authenticate
Problem
Phone cannot authenticate any configuration files other than the ITL file.
Cause
The configuration file may not be signed by the corresponding certificate in the phone Trust List.
Solution
Re-sign the configuration file by using the correct certificate.
Phone Does Not Register
Problem
Phone does not register with Cisco Unified Communications Manager.
Cause
The CTL file does not contain the correct information for the Cisco Unified Communications Manager server.
Solution
Change the Cisco Unified Communications Manager server information in the CTL file.
Signed Configuration Files Are Not Requested
Problem
Phone does not request signed configuration files.
Cause
The CTL file does not contain any TFTP entries with certificates.
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Communications Manager 9.0 (SCCP and SIP)
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Troubleshooting and Maintenance
Cisco Unified IP Phone Security Problems
