Cisco Systems 7970G manual Checking Power Connection, Problem Possible Cause

Chapter 9 Troubleshooting and Maintenance

Troubleshooting Cisco Unified IP Phone Security

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 2-20.

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 9-1provides 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.

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 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	Bad TFTP record.
configuration files other than the CTL file.

	Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
9-12	OL-11524-01