Phone Cannot Authenticate Ctl File; Ctl File Authenticates But Other Configuration Files Do Not Authenticate; Phone Does Not Register; Signed Configuration Files Are Not Requested - Cisco Unified IP Phone 8941 Administration Manual

Cisco IP Phone Security Problems
Solution
Install a correct certificate.

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.

CTL File Authenticates but Other Configuration Files Do Not Authenticate

Problem
Phone cannot authenticate any configuration files other than the CTL file.
Cause
A bad TFTP record exists, or the configuration file may not be signed by the corresponding certificate in the
phone Trust List.
Solution
Check the TFTP record and the certificate in the Trust List.

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.
Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 10.0
(SCCP and SIP)
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