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Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
Resolving Voice Quality and Roaming Problems
9-10
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
Resolving Voice Quality and Roaming Problems
Cisco Wireless IP Phone 7920 users might have problems with voice quality and
connectivity when roaming with their phones. See the following sections for
troubleshooting information:
• Symptom: Cisco Wireless IP Phone Resets Unexpectedly, page 9-10
• Symptom: The Cisco Wireless IP Phone Has Audio Problems, page 9-13
• Symptom: The Cisco Wireless IP Phone Does Not Roam Properly, page 9-14
Symptom: Cisco Wireless 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 CallManager connection are stable, a Cisco Wireless IP Phone 7920 should
not reset on its own.
Typically, a phone resets if it has problems connecting to the AP and Ethernet
network or to Cisco CallManager. These sections can help you identify the cause
of a phone resetting in your network:
• Verifying Access Point Settings, page 9-10
• Identifying Intermittent Network Outages, page 9-11
• Verifying DHCP Settings, page 9-11
• Checking Static IP Address Settings, page 9-11
• Verifying Voice VLAN Configuration, page 9-11
• Verifying that the Phones Have Not Been Intentionally Reset, page 9-12
• Eliminating DNS or Other Connectivity Errors, page 9-12
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
“Wireless Network and Access Point Configuration” section on page 3-3 for
information about AP settings.