Specifications
Table Of Contents
- Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0 and Later
- Contents
- Preface
- An Overview of the Cisco Unified Wireless IP Phone 7921G
- An Overview of the Voice Over IP Wireless Network
- Understanding the Wireless LAN
- Components of the VoIP Wireless Network
- Voice Over IP Wireless Network Configuration
- Site Survey Verification
- Setting Up the Cisco Unified Wireless IP Phone 7921G
- Before You Begin
- Installing the Cisco Unified Wireless IP Phone 7921G
- Powering On the Cisco Unified Wireless IP Phone 7921G
- Understanding the Phone Startup Process
- Using the Cisco Unified Wireless IP Phone 7921G Web Pages
- Using the USB Connection for Initial Phone Configuration
- Updating Phones Remotely
- Configuring Network Profiles
- Configuring USB Settings
- Configuring Trace Settings
- Using System Settings
- Configuring Settings on the Cisco Unified Wireless IP Phone 7921G
- Accessing Network and Phone Settings
- Configuring Network Profile Settings
- Changing Phone Settings
- Configuring the Security Certificate on the Phone
- Changing the USB Configuration
- Configuring Features, Templates, Services, and Users
- Configuring Cisco Unified Wireless IP Phones in Cisco Unified CallManager
- Telephony Features Available for the Phone
- Specific Configuration Options for the Cisco Unified Wireless IP Phone 7921G
- Configuring Softkey Templates
- Modifying Phone Button Templates
- Setting Up Services
- Configuring Corporate and Personal Directories
- Adding Users to Cisco Unified CallManager
- Managing the User Options Web Pages
- Creating Custom Phone Rings
- Viewing Security, Device, Model, and Status Information on the Phone
- Monitoring the Cisco Unified Wireless IP Phone Remotely
- Troubleshooting the Cisco Unified Wireless IP Phone 7921G
- Resolving Startup and Connectivity Problems
- Resolving Voice Quality and Roaming Problems
- General Troubleshooting Information
- Erasing the Local Configuration
- Providing Information to Users By Using a Website
- Supporting International Users
- Physical and Operating Environment Specifications
- Checklist for Deploying the Cisco Unified Wireless IP Phone 7921G
- Index
9-11
Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0
OL-10802-02
Chapter 9 Troubleshooting the Cisco Unified Wireless IP Phone 7921G
Resolving Voice Quality and Roaming Problems
Resolving Voice Quality and Roaming Problems
Cisco Unified Wireless IP Phone 7921G users might have problems with voice
quality and connectivity when roaming with their phones. See the following
sections for troubleshooting information:
• Symptom: unified IP phone Resets Unexpectedly, page 9-11
• Symptom: The unified IP phone Has Audio Problems, page 9-14
• Symptom: The unified IP phone Does Not Roam Properly, page 9-15
• Monitoring the Voice Quality of Calls, page 9-17
Symptom: unified IP phone Resets Unexpectedly
If users report that their phones are resetting during calls or resetting while idle
on their desk, you should investigate the cause. If the network connection and
Cisco
Unified CallManager connection are stable, a Cisco Unified Wireless
IP
Phone 7921G should not reset on its own.
Typically, a phone resets if it has problems connecting to the access point and
LAN or to Cisco
Unified CallManager. These sections can help you identify the
cause of a phone resetting in your network:
• Verifying Access Point Settings, page 9-11
• Identifying Intermittent Network Outages, page 9-12
• Verifying DHCP Settings, page 9-12
• Verifying Voice VLAN Configuration, page 9-12
• Verifying that the Phones Have Not Been Intentionally Reset, page 9-13
• Eliminating DNS or Other Connectivity Errors, page 9-13
Verifying Access Point Settings
Verify that the wireless configuration is correct. For example, check if the
particular access point or switch to which the phone is connected is down. See the
“Voice Over IP Wireless Network Configuration” section on page 2-27 for
information about access point settings.