Cisco CP-7911G Administration Guide - Page 233

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