Cisco 7970G Administration Guide - Page 246

Troubleshooting Cisco Unified IP Phone Security Chapter 9 Troubleshooting and Maintenance Checking Power Connection In most cases, a phone will restart if it powers up by using external power but loses that connection and switches to PoE. Similarly, a phone may restart if it powers up by using PoE and then gets connected to an external power supply. Troubleshooting Cisco Unified IP Phone Security Table 9-1 provides troubleshooting information for the security features on the Cisco Unified IP Phone. For information relating to the solutions for any of these issues, and for additional troubleshooting information about security, refer to Cisco Unified Communications Manager Security Guide. Table 9-1 Cisco Unified IP Phone Security Troubleshooting Problem Possible Cause CTL File Problems 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 There is a bad 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. 9-12 Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1 OL-14626-01