Contents
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Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
OL-14029-01
C H A P T E R
7
Troubleshooting and Maintenance
7-1
Resolving Startup Problems
7-1
Symptom: The Cisco Unified IP Phone Does Not Go Through its Normal
Startup Process
7-2
Symptom: The Cisco Unified IP Phone Does Not Register with Cisco Unified
Communications Manager
7-3
Identifying Error Messages
7-3
Registering the Phone with Cisco Unified Communications Manager
7-4
Checking Network Connectivity
7-4
Verifying TFTP Server Settings
7-4
Verifying IP Addressing and Routing
7-5
Verifying DNS Settings
7-5
Verifying Cisco Unified Communications Manager Settings
7-5
Cisco Unified Communications Manager and TFTP Services Are Not
Running
7-6
Creating a New Configuration File
7-6
Symptom: Cisco Unified IP Phone Unable to Obtain IP Address
7-8
Cisco Unified IP Phone Resets Unexpectedly
7-8
Verifying Physical Connection
7-9
Identifying Intermittent Network Outages
7-9
Verifying DHCP Settings
7-9
Checking Static IP Address Settings
7-10
Verifying Voice VLAN Configuration
7-10
Verifying that the Phones Have Not Been Intentionally Reset
7-10
Eliminating DNS or Other Connectivity Errors
7-11
General Troubleshooting Tips for the Cisco Unified IP Phone
7-12
Resetting or Restoring the Cisco Unified IP Phone
7-15
Performing a Basic Reset
7-16
Where to Go for More Troubleshooting Information
7-16
Cleaning the Cisco Unified IP Phone
7-16
Summary of Contents for 3911
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