Cisco 7965G Administration Manual page 181

Chapter 9 Troubleshooting and Maintenance
Table 9-2
Summary
Sound sample mismatch
between the phone and
another device
Gaps in voice calls
Loopback condition
One-way audio
Peer Firmware Sharing
fails.
Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.0
OL-12650-01
Cisco Unified IP Phone Troubleshooting (continued)
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 7-13
for information about 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 7-13
for information about 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_THRESHO
LD
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
configures.
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
Note
messages sent to the phone log.
General Troubleshooting Tips
9-13