Cisco 7911G - IP Phone VoIP Administration Manual page 233

Chapter 9 Troubleshooting and Maintenance
Table 9-1
Problem
Device authentication error.
Phone cannot authenticate CTL file. The security token that signed the
Phone cannot authenticate any of the
configuration files other than the
CTL file.
Phone reports TFTP authorization
failure.
Phone does not register with
Cisco Unified Communications
Manager.
Phone does not request signed
configuration files.
Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0
OL11954-01
Cisco Unified IP Phone Security Troubleshooting
Troubleshooting Cisco Unified IP Phone Security
Possible Cause
CTL file does not have a
Cisco Unified Communications Manager
certificate or has an incorrect certificate.
updated CTL file does not exist in the
CTL file on the phone.
Invalid TFTP record.
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.
The CTL file does not contain the correct
information for the
Cisco Unified Communications Manager
server.
The CTL file does not contain any TFTP
entries with certificates.
9-13