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Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
General Troubleshooting Information
9-16
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
Battery life is shorter than specified An unstable RF environment can cause the phone to remain in
active mode because it is constantly seeking an AP. This
reduces the battery life considerably. When leaving an area of
coverage, shut down the phone.
Vibrate mode can reduce battery life, but back light should not
affect the battery.
Higher phone transmit power can affect battery life.
To maximize idle time on the phone and conserve battery life,
you need to optimize the registration time so the phone can go
into power save mode more often.
Phone is resetting The phone resets when it loses contact with the
Cisco CallManager software. This lost connection can be due to
any network connectivity disruption, including AP problems,
switch outages, and switch reboots.
See the “Symptom: Cisco Wireless IP Phone Resets
Unexpectedly” section on page 9-10.
Time on phone is incorrect Sometimes the time or date on the phone is incorrect. The
Cisco Wireless IP Phone 7920 gets its time and date when it
registers with Cisco CallManager. Power cycle the phone to
reset the time or date.
Ring volume is too low To see if the ring volume is set correctly on the phone, choose
Menu > Profiles > Ring Volume. Choose 6 for the highest
volume.
You can download loud ring tones from the Software Download
page on Cisco.com. See the “Downloading Loud Ring Tones”
section on page 7-5.
Table 9-1 Cisco Wireless IP Phone Troubleshooting (continued)
Summary Explanation