Cisco 7975G - Unified IP Phone VoIP Troubleshooting And Maintenance - Page 8

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Also for Cisco 7975G - Unified IP Phone VoIP: Datasheet (5 pages), User Manual (21 pages), Preparing To Install (17 pages), Customizing (11 pages), Installation Manual (19 pages), Quick Manual (15 pages), Installation Manual (12 pages), Admin Manual (6 pages), User Manual (42 pages)

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Cisco Unified IP Phone Security Problems

Solution

In most cases, a phone restarts 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 connects to an external power

supply.

Cisco Unified IP Phone Security Problems

The following sections provide troubleshooting information for the security features on the Cisco Unified IP

Phone. For information about the solutions for any of these issues, and for additional troubleshooting

information about security, see Cisco Unified Communications Manager Security Guide.

The following sections assist in troubleshooting CTL file problems.

Authentication Error, Phone Cannot Authenticate CTL File

Problem

A device authentication error occurs.

Cause

CTL file does not have a Cisco Unified Communications Manager certificate or has an incorrect certificate.

Solution

Install a correct certificate.

Phone Cannot Authenticate CTL File

Problem

Phone cannot authenticate the CTL file.

Cause

The security token that signed the updated CTL file does not exist in the CTL file on the phone.

Solution

Change the security token in the CTL file and install the new file on the phone.

ITL File Authenticates but Other Configuration Files Do Not Authenticate

Problem

Phone cannot authenticate any configuration files other than the ITL file.

Cause

The configuration file may not be signed by the corresponding certificate in the phone Trust List.

Troubleshooting and Maintenance