Cisco 7961G-GE - IP Phone VoIP Administration Manual page 238

General Troubleshooting Tips
Table 9-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary
Changing the telephone
configuration.
Phone resetting.
LCD 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.
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.0
9-16
Explanation
By default, the network configuration options are locked to
prevent users from making changes that could impact their
network connectivity. You must unlock the network
configuration options before you can configure them. See the
"Unlocking and Locking Options" section on page 4-3
details.
The phone resets when it loses contact with the Cisco
Unified Communications Manager software. This lost
connection can be due to any network connectivity disruption,
including cable breaks, switch outages, and switch reboots.
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 7-17
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.
Chapter 9 Troubleshooting and Maintenance
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