This document provides information to help you determine whether a
hardware replacement is likely to solve the problems you are experiencing with
your Cisco 7921, 7925, 7926 Wireless Phones via troubleshooting steps.
Some of the questions in this document refer to the "Diagnostic tool"
that is built in to the phone menu. This tool is available for use as of
release 1.3.4. Refer to this link for more information on the Diagnostic Tool:
"Viewing Hardware Diagnostics" in the
Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G User Guide.
There are no specific requirements for this document.
This document is not restricted to specific software and hardware
Technical Tips Conventions for more information on document
If the 792x phone will not power on,
may need to hold the red power button down for as much as 10
check with known good AC adapter and/or battery
replace the defective part (handset, AC adapter or
If the 792x battery will not hold a charge, check with known good AC
adapter and battery.
If the 792x has audio issues, test the microphone, handset, headset
or speakerphone via the
hardware diagnostics tool.
the phone to factory default and reconfigure the phone to access the
local network. If the audio problems persist, and if other phones in the same
location work fine, then ask for a hardware replacement of the 792x
For non-hardware related issues, contact the TAC by
raising a service request
(registered customers only)
to pursue troubleshooting.
Wireless TAC issues typically include:
Experiencing voice gaps, one-way or no way audio, or choppy
Experiencing roaming failures
Experiencing WLAN authentication
Voice TAC issues typically include:
Unable to register to CUCM
Unable to upgrade firmware
Unable to place or receive a call
CUCM feature issues
Echo while on call, noise