Cisco CP-3911 - Unified SIP Phone 3911 VoIP Administration Manual page 8

Contents
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C H A P T E R
Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
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Troubleshooting and Maintenance
Resolving Startup Problems
Symptom: The Cisco Unified IP Phone Does Not Go Through its Normal
Startup Process
Symptom: The Cisco Unified IP Phone Does Not Register with Cisco Unified
Communications Manager
Identifying Error Messages
Registering the Phone with Cisco Unified Communications Manager
Checking Network Connectivity
Verifying TFTP Server Settings
Verifying IP Addressing and Routing
Verifying DNS Settings
Verifying Cisco Unified Communications Manager Settings
Cisco Unified Communications Manager and TFTP Services Are Not
Running
Creating a New Configuration File
Symptom: Cisco Unified IP Phone Unable to Obtain IP Address
Cisco Unified IP Phone Resets Unexpectedly
Verifying Physical Connection
Identifying Intermittent Network Outages
Verifying DHCP Settings
Checking Static IP Address Settings
Verifying Voice VLAN Configuration
Verifying that the Phones Have Not Been Intentionally Reset
Eliminating DNS or Other Connectivity Errors
General Troubleshooting Tips for the Cisco Unified IP Phone
Resetting or Restoring the Cisco Unified IP Phone
Performing a Basic Reset
Where to Go for More Troubleshooting Information
Cleaning the Cisco Unified IP Phone
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