Cisco 7965G Administration Guide

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Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.0
OL-12650-01
Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips
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 7-13
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 7-13
for information about displaying these statistics.
Loopback condition A loopback condition can occur when the following
conditions are met:
• The SW Port Configuration option in the
Network Configuration menu on the phone is set
to 10 Half
(10-BaseT/half duplex)
• The phone receives power from an external
power supply
• The phone is powered down (the power supply is
disconnected)
In this case, the switch port on the phone can become
disabled and the following message will appear in
the switch console log:
HALF_DUX_COLLISION_EXCEED_THRESHO
LD
To resolve this problem, re-enable the port from the
switch.
One-way audio When at least one person in a call does not receive
audio, IP connectivity between phones is not
established. Check the configurations in routers and
switches to ensure that IP connectivity is properly
configures.
Peer Firmware Sharing
fails.
If the Peer Firmware Sharing fails, the phone will
default to using the TFTP server to download
firmware. Access the log messages stored on the
remote logging machine to help debug the Peer
Firmware Sharing feature.
Note These log messages are different than the log
messages sent to the phone log.
Table 9-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary Explanation

Cisco 7965G Specifications

General

Protocol Support	SIP, SCCP
Weight	3.5 lbs (1.6 kg)
Ethernet	10/100 Mbps
Power	IEEE 802.3af Power over Ethernet (PoE)
Expansion Module Support	Supports up to two Cisco Unified IP Phone Expansion Modules
Speakerphone	Full-duplex speakerphone
Lines	6 lines
Codecs	G.711, G.729a, iLBC