Cisco 8961 Administration Manual page 299

Troubleshooting and Maintenance
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Cause
The TFTP address for the phone does not exist in the CTL file.
If you created a new CTL file with a new TFTP record, the existing CTL file on the phone may not contain
a record for the new TFTP server.
Solution
Check the configuration of the TFTP address in the phone CTL file.
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.
Solution
Configure TFTP entries with certificates in the CTL file.
802.1X Authentication Problems
801.1X authentication problems can be broken into the categories that are described in the following table.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
Cisco Unified IP Phone Security Problems
(SIP)
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