Cisco 7960G Administration Manual page 153

Chapter 8 Troubleshooting the Cisco IP Phone
Table 8-2 Cisco 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.
Checking signaling.
Cisco IP Phone Administration Guide for Cisco CallManager 4.0, Cisco IP Phones 7960G/7940G
OL-4825-01
General Troubleshooting Tips for the Cisco IP Phone
Explanation
The RxType and the TxType statistics show the codec that is
being used for a conversation between this IP phone and the
other device. These 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 6-13
information about displaying these statistics.
The RxSize and the TxSize statistics show the size of the voice
packets that is being used a conversation between this IP phone
and the other device. The values of these statistics should
match.
See the "Call Statistics Screen" section on page 6-13
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 6-13
information about displaying these statistics.
To check that signaling is working properly between the phone
and Cisco CallManager, press the Speaker button on the phone
to answer a call. If you can answer a call and if you hear a dial
tone, signaling is working properly.
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