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Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified Communications Manager Release 7.0
OL-15985-01
Chapter 10 Troubleshooting the Cisco Unified Wireless IP Phone 7921G
General Troubleshooting Information
Ring volume is too low
To see if the ring volume is set correctly on the phone, choose Settings
>Phone Settings > Sound Settings > Volumes. Scroll up for the highest
volume
You can also press the volume button on the side of the phone and the volume
setting appears on the phone screen.
Phone does not ring
To see if the phone is set to ring, choose Settings > Phone Settings > Sound
Settings > Alert Pattern, and check that it a ring setting is selected.
To see if a ring tone has been set for the phone, choose Settings > Phone
Settings > Ring Tone. If none is set, add a ring tone for the phone.
To see if the speaker is functioning properly, adjust the ring volume settings
to the highest level. Enable keypad tones or call the phone to check the
speaker.
One-way audio on phone
Check that the speaker is functioning properly. Adjust the speaker volume
setting and call the phone to check the speaker.
Check that ARP caching has been set on the AP. See
“VoIP WLAN
Configuration” section on page 2-18
.
Delays when roaming from one location to
another
If Cisco Catalyst 45xx series switches are being used as the main Layer 3
switches in the network, ensure that the supervisor blades are a minimum
SUP2+ or later version. The Cisco Unified Wireless IP Phone 7921G (or any
wireless client) experiences roaming delays when an earlier version (SUP 1
or SUP2) blade is used.
Phone firmware downgrades
After applying a Cisco Unified Communications Manager upgrade or patch,
that is older than the current Cisco Unified Wireless IP Phone 7921G
firmware, the phones could automatically downgrade to the load contained in
the patch. Check the Cisco Unified Communications Manager 7921G device
default image in the TFTP folder to fix this problem.
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.
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 call cannot be established
The phone does not have a DHCP IP address, is unable to register to Cisco
Unified Communications Manager, and shows a Configuring IP or
Registering message.
Verify the following:
1.
The Cisco CallManager service is running on the Cisco Unified
Communications Manager server.
2.
Both phones are registered to the same Cisco Unified Communications
Manager.
3.
Audio server debug and capture logs are enabled for both phones. If
needed, enable Java debug.
Table 10-3
Cisco Unified Wireless IP Phone Troubleshooting Tips (continued)
Summary
Explanation
