Cisco 7965G Administration Guide - Page 170

The SW Port Configuration option in the Network Configuration, Cisco VT Advantage/Unified

Page 170 highlights

General Troubleshooting Tips Chapter 9 Troubleshooting and Maintenance Table 9-2 Cisco Unified IP Phone Troubleshooting (continued) Summary Gaps in voice calls Loopback condition One-way audio Peer Firmware Sharing fails. Cisco VT Advantage/Unified Video Advantage (CVTA) Explanation 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 7-11 for information about displaying these statistics. 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_THRESHOLD To resolve this problem, re-enable the port from the switch. 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. 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. If you are having problems getting CVTA to work, make sure that the PC Port is enabled, and that CDP is enabled on the PC port. See Network Configuration Menu, page 4-5 for more information. 9-12 Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.1 OL-14641-01

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9-12
Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.1
OL-14641-01
Chapter 9
Troubleshooting and Maintenance
General Troubleshooting Tips
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 7-11
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_THRESHOLD
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.
Cisco VT Advantage/Unified
Video Advantage (CVTA)
If you are having problems getting CVTA to work, make sure that the
PC Port is enabled, and that CDP is enabled on the PC port.
See
Network Configuration Menu, page 4-5
for more information.
Table 9-2
Cisco Unified IP Phone Troubleshooting (continued)
Summary
Explanation