Cisco 7931G - Unified IP Phone VoIP Administration Manual page 220

General Troubleshooting Tips
Table 9-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary
Display issues
Dual-Tone Multi-Frequency (DTMF)
delay
Codec mismatch between the phone
and another device
Sound sample mismatch between the
phone and another device
Gaps in voice calls
Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.0
9-16
Explanation
If the display appears to have rolling lines or a wavy pattern, it
might be interacting with certain types of older fluorescent
lights in the building. Moving the phone away from the lights,
or replacing the lights, should resolve the problem.
When you are on a call that requires keypad input, if you press
the keys too quickly, some of them might not be recognized.
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 7-16
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 7-16
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 7-16
information about displaying these statistics.
Chapter 9 Troubleshooting and Maintenance
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