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Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP and SIP)
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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 7-13
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_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 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