Chapter9 Troubleshooting and Maintenance
Troubleshooting Cisco Unified IP Phone Security
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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
Step5 From Cisco Unified CallManager, choose Device > Phone and verify that you
have assigned the correct MAC address to this CiscoUnified IP Phone. For
information about determining a MAC address, see the “Determining the MAC
Address of a Cisco UnifiedIP Phone” section on page 2-20.
Step6 Power cycle the phone.

Checking Power Connection

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 UnifiedCallManager Security Guide.
Table9-1 Cisco Unified IP Phone Security Troubleshooting
Problem Possible Cause
CTL File Problems
Device authentication error. CTL file does not have a Cisco UnifiedCallManager
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
configuration files other than the CTL file.
Bad TFTP record.