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Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
Resolving Startup and Connectivity Problems
9-6
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
The Cisco Wireless IP Phone 7920 does not cache the IP information passed from
the DHCP server, so the TFTP request must be sent and responded to every time
the phone power cycles.
If you have assigned a static IP address to the phone, you must manually enter this
setting. See the “Configuring Static Settings” section on page 5-9.
If you are using DHCP, the phone obtains the address for the TFTP server from
the DHCP server. Check the IP address configured in Option 150 or Option 66.
Refer to Configuring Windows 2000 DHCP Server for Cisco Call Manager
available at this URL:
http://www.cisco.com/warp/customer/788/AVVID/win2000_dhcp.html
You can also enable the phone to use an alternate TFTP server. Such a setting is
particularly useful if the phone was recently moved from one location to another.
For information about determining and changing TFTP server settings, see
“Configuring TFTP Options” section on page 5-13 or “Viewing the Current
Configuration” section on page 8-1.
Verifying IP Addressing and Routing
You should verify the IP addressing and routing settings for the Cisco Wireless
IP Phone 7920. If you are using DHCP, the DHCP server should provide these
values. If you have assigned a static IP address to the phone, you must enter these
values manually.
Note When the Cisco Wireless IP Phone loses the RF signal, the phone will not release
the DHCP unless it reaches the time-out state.
Check for the following problems:
• DHCP Server—If you have assigned a static IP address to the phone, you do
not need to enter a value for the DHCP Server option. However, if you are
using a DHCP server, this option must have a value. If it does not, check your
IP routing and VLAN configuration. Refer to Troubleshooting Switch Port
Problems, available at this URL:
http://www.cisco.com/warp/customer/473/53.shtml
• IP Address, Subnet Mask, Primary Gateway—If you have assigned a static
IP address to the phone, you must manually enter settings for these options.
See the “Configuring Static Settings” section on page 5-9.