Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips
9-16
Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.0
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Display issues 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.
Dual-Tone Multi-Frequency (DTMF)
delay
When you are on a call that requires keypad input, if you press
the keys too quickly, some of them might not be recognized.
Codec mismatch between the phone
and another device
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 for
information about displaying these statistics.
Sound sample mismatch between the
phone and another device
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 for
information about displaying these statistics.
Gaps in voice calls 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 for
information about displaying these statistics.
Table 9-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary Explanation
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