Cisco Systems ATA187I1ARF manual Troubleshooting ATA 187 Security, General Troubleshooting Tips

Chapter 6 Troubleshooting and Maintenance

Troubleshooting ATA 187 Security

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 ATA 187 Security

Table 6-1provides troubleshooting information for the security features on the ATA 187. For information relating to the solutions for any of these issues, and for additional troubleshooting information about security, see the Cisco Unified Communications Manager Security Guide.

Table 6-1 ATA 187 Security Troubleshooting

Problem

Possible Cause

CTL File Problems

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 configuration	The configuration file may not be signed by the
files other than ITL file.	corresponding certificate in the phone’s Trust List.
Phone does not register with	The CTL file does not contain the correct
Cisco Unified Communications Manager.	information for the
	Cisco Unified Communications Manager server.
Phone does not request signed configuration files.	The CTL file does not contain any TFTP entries
	with certificates.

General Troubleshooting Tips

Table 6-2provides general troubleshooting information for the ATA 187.

Table 6-2 ATA 187 Troubleshooting

Summary	Explanation
Daisy-chaining phones	Cisco does not support connecting a phone to another phone through
	the PC port. Each phone should directly connect to a switch port. If
	phones are connected together in a line (by using the PC port), the
	phones will not work.
Poor quality when calling mobile	In Cisco Unified Communications Manager, you can configure the
phones using the G.729 protocol	network to use the G.729 protocol (the default is G.711). When
	using G.729, calls between a phone and a mobile phone will have
	poor voice quality. Use G.729 only when absolutely necessary.

Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.0

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