Cisco Systems 8941 Troubleshooting Cisco Unified IP Phone Security, Checking Power Connection

Chapter

Troubleshooting Cisco Unified IP Phone Security

Step 4 From Cisco Unified Communications Manager, 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 Communications Manager, choose Device > Phone > Find 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 for a Cisco Unified IP Phone” section on page 2-11.

Step 6 Power cycle the phone.

Checking Power Connection

In most cases, a phone will restart 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 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 and encryption, 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 the		Bad TFTP record.
configuration files other than the CTL file.
Phone does not register with Cisco Unified		The CTL file does not contain the correct information for the Cisco
Communications Manager.		Unified Communications Manager server.
Phone does not request signed configuration		The CTL file does not contain any TFTP entries with certificates.
files.

Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)

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