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Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
Resolving Voice Quality and Roaming Problems
9-12
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
By isolating the wireless phones on a separate auxiliary VLAN, you can use QoS
to prioritize the voice traffic over data traffic and improve the voice quality. See
the “Voice Quality in a Wireless Network” section on page 2-5 for details.
Verifying that the Phones Have Not Been Intentionally Reset
If you are not the only administrator with access to Cisco CallManager, you
should verify that no one else has intentionally reset the phones.
Eliminating DNS or Other Connectivity Errors
If the phone continues to reset, check to see if you are using host names or IP
addresses for Cisco CallManager servers. Follow these steps to eliminate DNS or
other connectivity errors:
Procedure
Step 1 Reset the phone to factory defaults. See the “Erasing the Local Configuration”
section on page 9-19 for details.
Step 2 Modify DHCP and IP settings.
a. Disable DHCP. See the “Modifying DHCP Settings” section on page 5-7 for
details.
b. Assign static IP values to the phone. See the “Configuring Static Settings”
section on page 5-9 for details. Use the same default router setting used for
other functioning Cisco IP Phones.
c. Assign a TFTP server. See the “Configuring TFTP Options” section on
page 5-13 for details. Use the same TFTP server used for other functioning
Cisco IP Phones.
Step 3 On the Cisco CallManager server, verify that the local host files have the correct
Cisco CallManager server name mapped to the correct IP address. If you are using
host names, you must be using DNS service so that the phone can resolve the host
names to their IP addresses. Refer to Configuring the IP Hosts File on a Windows
2000 CallManager Server, available at this URL:
http://www.cisco.com/warp/customer/788/AVVID/cm_hosts_file.html
Step 4 From Cisco CallManager, choose System > Server and verify that the server is
referred to by its IP address and not by its host name.