Cisco 7906G Administration Guide - Page 228

Troubleshooting Cisco Unified IP Phone Security Chapter 9 Troubleshooting and Maintenance Step 5 Step 6 From Cisco Unified Communications Manager, choose Device > Phone and verify that you have assigned the correct MAC address to this Cisco Unified IP Phone. For information about determining a MAC address, see the "Determining the MAC Address of a Cisco Unified IP Phone" section on page 2-17. Power cycle the phone. Checking Power Connection (SIP Phones Only) In most cases, a phone will restart if it powers up using external power but loses that connection and switches to PoE. Similarly, a phone may restart if it powers up 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 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 Invalid TFTP record. the configuration files other than the CTL file. 9-12 Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.1 OL-14585-01