Specifications

Chapter 9 Troubleshooting the Cisco Unified Wireless IP Phone 7921G
Resolving Startup and Connectivity Problems
9-2
Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0
OL-10802-02
• Symptom: The Wireless IP Phone Does Not Associate with a Cisco Aironet
Access Point, page 9-3
• Symptom: The unified IP phone Does Not Register with Cisco
Unified CallManager, page 9-5
Symptom: The unified IP phone Does Not Complete the Normal
Start Up Process
When a unified IP 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.
To determine whether the phone is functional, follow these suggestions to
systematically eliminate these potential problems:
1. Verify that the wired network is accessible by placing calls to and from other
wired Cisco
Unified IP Phones.
2. Verify that the wireless network is accessible:
• Power on another previously functional Cisco Unified Wireless
IP
Phone 7921G to verify that the access point is active.
• Power on the wireless IP 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 you see “Low Battery” on the phone screen, the battery might be dead.
• Insert a new or fully charged battery in the wireless IP 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 Push to Talk button and the Speaker button and then press
the Power-on button.