Contents

C H A P T E R 9

Troubleshooting and Maintenance 9-1

 

Resolving Startup Problems 9-2

 

Symptom: The Cisco Unified IP Phone Does Not Go Through its Normal

 

Startup Process 9-2

 

Symptom: The Cisco Unified IP Phone Does Not Register with Cisco

 

Unified CallManager 9-3

 

Identifying Error Messages 9-4

 

 

 

 

 

 

 

Checking Network Connectivity

9-4

 

 

 

 

 

 

Verifying TFTP Server Settings

9-4

 

 

 

 

 

 

Verifying IP Addressing and Routing

9-5

 

 

 

 

 

Verifying DNS Settings

9-6

 

 

 

 

 

 

 

Verifying Cisco Unified CallManager Settings 9-6

 

 

 

 

Cisco Unified CallManager and TFTP Services Are Not Running 9-6

 

Creating a New Configuration File 9-7

 

 

 

 

 

Registering the Phone with Cisco Unified CallManager

9-8

 

 

 

Symptom: Cisco Unified IP Phone Unable to Obtain IP Address 9-8

 

Cisco Unified IP Phone Resets Unexpectedly

9-9

 

 

 

 

 

Verifying Physical Connection 9-9

 

 

 

 

 

 

 

Identifying Intermittent Network Outages

9-9

 

 

 

 

Verifying DHCP Settings

9-10

 

 

 

 

 

 

 

Checking Static IP Address Settings

9-10

 

 

 

 

 

Verifying Voice VLAN Configuration

9-10

 

 

 

 

 

 

Verifying that the Phones Have Not Been Intentionally Reset

9-11

 

 

Eliminating DNS or Other Connectivity Errors

9-11

 

 

 

 

Checking Power Connection

9-12

 

 

 

 

 

 

 

Troubleshooting Cisco Unified IP Phone Security

9-12

 

 

 

 

General Troubleshooting Tips

9-15

 

 

 

 

 

 

 

Resetting or Restoring the Cisco Unified IP Phone

9-17

 

 

 

 

Performing a Basic Reset

9-18

 

 

 

 

 

 

 

Performing a Factory Reset

9-19

 

 

 

 

 

 

 

Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones

 

 

 

 

OL-11524-01

 

 

 

 

 

 

 

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Cisco Systems 7970G manual Troubleshooting and Maintenance