Cisco 7961G - IP Phone VoIP Administration Manual page 222

General Troubleshooting Tips
Table 9-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary
Codec mismatch between the phone
and another device.
Sound sample mismatch between the
phone and another device.
Gaps in voice calls.
Loopback condition.
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE Administration Guide for Cisco Unified CallManager
9-16
Explanation
The RxType and the TxType statistics show the codec that is
being used for a conversation between this Cisco
Unified IP phone and the other device. The values of these
statistics should match. If they do not, verify that the other
device can handle the codec conversation or that a transcoder is
in place to handle the service.
See the "Call Statistics Screen" section on page 7-17
information about displaying these statistics.
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 7-17
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 7-17
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_THRESHOLD
To resolve this problem, re-enable the port from the switch.
Chapter 9 Troubleshooting and Maintenance
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