9-13
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
Resolving Voice Quality and Roaming Problems
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 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
Step 1
Reset the phone to factory defaults. See the
“Erasing the Local Configuration”
section on page 9-22
for details.
Step 2
Modify DHCP and IP settings:
a.
Disable DHCP. See the
“Modifying DHCP Settings” section on page 5-4
for
details.
b.
Assign static IP values to the phone. See the
“Configuring Static Settings”
section on page 5-6
for details. Use the same default router setting used for
other functioning Cisco IP Phones.
c.
Assign a TFTP server. See the
“Configuring TFTP Option” section on
page 5-9
for details. Use the same TFTP server used for other functioning
Cisco IP Phones.
Step 3
From Cisco CallManager, choose
System > Server
and verify that the server is
referred to by its IP address and not by its host name.
Note
Cisco recommends that you configure IP addresses only and not host
names to eliminate the DNS resolution in the phone registration process.
Содержание 7920 - Unified Wireless IP Phone VoIP
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