Cisco Systems 7970G manual Cisco CallManager Serviceability, Choose Tools Control Center

Chapter 9 Troubleshooting and Maintenance

Resolving Startup Problems

Verifying DNS Settings

If you are using DNS to refer to the TFTP server or to

Cisco Unified CallManager, you must ensure that you have specified a DNS server. Verify this setting by pressing the Settings button on the phone, choosing Network Configuration, and scrolling to the DNS Server 1 option. You should also verify that there is a CNAME entry in the DNS server for the TFTP server and for the Cisco Unified CallManager system.

You must also ensure that DNS is configured to do reverse look-ups.

Verifying Cisco Unified CallManager Settings

On the Cisco Unified IP Phone, press the Settings button, choose Network Configuration, and look at the CallManager 1–5options. The Cisco Unified IP Phone attempts to open a TCP connection to all the Cisco Unified CallManager servers that are part of the assigned Cisco Unified CallManager group. If none of these options contain IP addresses or show Active or Standby, the phone is not properly registered with Cisco Unified CallManager. See the “Registering the Phone with Cisco Unified CallManager” section on page 9-8for tips on resolving this problem.

Cisco Unified CallManager and TFTP Services Are Not Running

		If the Cisco Unified CallManager or TFTP services are not running, phones may
		not be able to start up properly. However, in such a situation, it is likely that you
		are experiencing a system-wide failure and that other phones and devices are
		unable to start up properly.
		If the Cisco Unified CallManager service is not running, all devices on the
		network that rely on it to make phone calls will be affected. If the TFTP service
		is not running, many devices will not be able to start up successfully.
		To start a service, follow these steps:
		Procedure
	Step 1	From Cisco Unified CallManager Administration, choose Application >
		Cisco CallManager Serviceability.
	Step 2	Choose Tools > Control Center.
	Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
9-6		OL-11524-01