Cisco 7961G Administration Guide

Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips for the Cisco IP Phone
9-14
Cisco IP Phone Administration Guide for Cisco CallManager, Cisco IP Phone 7961G/7961G-GE and 7941G/7941G-GE
OL-6966-01
Changing the telephone
configuration.
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 for
details.
Phone resetting. The phone resets when it loses contact with the
Cisco CallManager software. This lost connection can be due to
any network connectivity disruption, including cable breaks,
switch outages, and switch reboots.
LCD 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 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 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 is being used a conversation between this
Cisco 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.
Table 9-2 Cisco IP Phone Troubleshooting (continued)
Summary Explanation

Cisco 7961G Specifications

General

Brand	Cisco
Model	7961G
Category	IP Phone
Language	English