Cisco 7906G Administration Guide

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Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager 5.1
OL-11515-01
Chapter 9 Troubleshooting and Maintenance
Troubleshooting Cisco Unified IP Phone Security
Step 4 From Cisco Unified CallManager, choose System > Server and verify that the
server is referred to by its IP address and not by its DNS name.
Step 5 From Cisco Unified CallManager, 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 2-19.
Step 6 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
Unified CallManager Security Guide.
Ta b l e 9-1 Cisco Unified IP Phone Security Troubleshooting
Problem Possible Cause
Device authentication error. CTL file does not have a
Cisco
Unified CallManager 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.
Invalid TFTP record.

Cisco 7906G Specifications

General

Brand	Cisco
Model	7906G
Category	IP Phone
Language	English