Verifying That The Phones Have Not Been Intentionally Reset; Eliminating Dns Or Other Connectivity Errors - Cisco 7920 - Unified Wireless IP Phone VoIP Administration Manual

Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920

Verifying that the Phones Have Not Been Intentionally Reset

Eliminating DNS or Other Connectivity Errors

Step 1
Step 2
Step 3
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
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If you are not the only administrator with access to Cisco CallManager, you
should verify that no one else has intentionally reset the phones.
If the phone does not register with Cisco CallManager, check to see if you are
using host names or IP addresses for Cisco CallManager servers.
To eliminate DNS or other connectivity errors, follow these steps:
Procedure
Reset the phone to factory defaults. See the
section on page 9-22 for details.
Modify DHCP and IP settings:
Disable DHCP. See the
a.
details.
Assign static IP values to the phone. See the
b.
section on page 5-6
other functioning Cisco IP Phones.
Assign a TFTP server. See the
c.
page 5-9 for details. Use the same TFTP server used for other functioning
Cisco IP Phones.
From Cisco CallManager, choose System > Server and verify that the server is
referred to by its IP address and not by its host name.
Cisco recommends that you configure IP addresses only and not host
Note
names to eliminate the DNS resolution in the phone registration process.
Resolving Voice Quality and Roaming Problems
"Erasing the Local Configuration"
"Modifying DHCP Settings" section on page 5-4
for details. Use the same default router setting used for
"Configuring TFTP Option" section on
"Configuring Static Settings"
for
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