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Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
General Troubleshooting Information
9-18
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
Related Topics
• Logging Information for Troubleshooting, page 9-18
• Erasing the Local Configuration, page 9-19
Logging Information for Troubleshooting
The following options can help you gather troubleshooting information:
• Using a System Log Server, page 9-18
• Using the Trace Route Option on the Cisco Wireless IP Phone, page 9-18
Using a System Log Server
To gather information about problems with the wired network that can cause
roaming delays or no connectivity, set up a system log server. Enable “syslog” on
the network switches and access points that is logged to the system log server.
Also enable Network Time Protocol (NTP) so that all APs and switches use the
same times.
Using the Trace Route Option on the Cisco Wireless IP Phone
When you are experiencing problems with registering with Cisco CallManager, or
call connections, you can use this function to trace the path of a packet from the
phone to Cisco CallManager. The result shows the number of hops and the IP
address of each hop to reach the Cisco CallManager server. You can use this
information to check connectivity between the phone, Cisco CallManager servers
and gateways during a call.
Phone firmware downgrades After applying a Cisco CallManager upgrade or patch, that is
older than the current Cisco Wireless IP Phone 7920 firmware,
the phones could automatically downgrade to the load
contained in the patch. Check the Cisco CallManager 7920
device default image and the OS7920.txt file in the TFTP folder
to fix this problem.
Table 9-1 Cisco Wireless IP Phone Troubleshooting (continued)
Summary Explanation