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Chapter 9
Troubleshooting and Maintenance
Table 9-2
Cisco Unified IP Phone Troubleshooting (continued)
Summary
Sound sample mismatch between the
phone and another device.
Gaps in voice calls.
Loopback condition.
One-way audio.
Peer Firmware Sharing fails.
Cisco VT Advantage/Unified Video
Advantage (CVTA)
OL-15483-01
Explanation
The RxSize and the TxSize statistics show the size of the voice packets that are
being used in a conversation between this Cisco Unified IP phone and the other
device. The values of these statistics should match.
See the
"Call Statistics Screen" section on page 7-12
displaying these statistics.
Check the AvgJtr and the MaxJtr statistics. A large variance between these
statistics might indicate a problem with jitter on the network or periodic high
rates of network activity.
See the
"Call Statistics Screen" section on page 7-12
displaying these statistics.
A loopback condition can occur when the following conditions are met:
•
The SW Port Configuration option in the Network Configuration menu on
the phone is set to 10 Half
(10-BaseT / half duplex)
The phone receives power from an external power supply
•
The phone is powered down (the power supply is disconnected)
•
In this case, the switch port on the phone can become disabled and the
following message will appear in the switch console log:
HALF_DUX_COLLISION_EXCEED_THRESHOLD
To resolve this problem, re-enable the port from the switch.
When at least one person in a call does not receive audio, IP connectivity
between phones is not established. Check the configurations in routers and
switches to ensure that IP connectivity is properly configured.
If the Peer Firmware Sharing fails, the phone will default to using the TFTP
server to download firmware. Access the log messages stored on the remote
logging machine to help debug the Peer Firmware Sharing feature.
These log messages are different than the log messages sent to the
Note
phone log.
If you are having problems getting CVTA to work, make sure that the PC Port
is enabled, and that CDP is enabled on the PC port.
See
Network Configuration Menu, page 4-5
Cisco Unified IP Phone 7962G and 7942G Administration Guide for Cisco Unified Communications Manager 7.0
General Troubleshooting Tips
for information about
for information about
for more information.
9-11
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Table of Contents
Troubleshooting
