For additional troubleshooting information, see the Cisco Unified Communications Manager Troubleshooting
Guide.
Phone Does Not Go Through the Normal Startup Process
Problem
The phone does not start up and information does not display on the phone.
Cause
When a phone connects to the wireless network, the phone should go through its normal startup process and
the phone screen should display information.
If the phone does not complete the startup process, the cause might be due to low RF signal strength, network
outages, a dead battery in the phone, or the phone might not be functional.
Solution
To determine whether the phone is functional, follow these suggestions to systematically eliminate potential
problems.
1
Verify that the wired network is accessible by placing calls to and from other wired IP Phones.
2
Verify that the wireless network is accessible:
•
Power on another previously functional phone to verify that the access point is active.
•
Power on the phone that will not start up and move to a different access point location that is known
to be good.
3
Verify that the phone is receiving power:
•
If the message Low Battery is displayed on the phone screen, the battery might be dead.
•
Insert a new or fully charged battery in the phone that will not start up.
•
If you are using the battery, try plugging in the external power supply instead.
4
If the phone does not power up successfully, and never shows the main screen, try using Recovery Mode:
•
Press both the Application button and the Speaker button, and then press the Power/End
Call button.
The phone goes into recovery mode and checks the integrity of the firmware files.
•
If the recovery required message is displayed, press Power/End Call and Asterisk
(*) at the same time to boot to the alternate firmware image.
•
Using a browser, access the web page for the phone. See Access Web Page for Phone, on page 94
for instructions.
Go to the Phone Recovery section on the web page and upload a new phone software TAR file.
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
113
Troubleshooting
Phone Does Not Go Through the Normal Startup Process
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