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Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
OL-15299-01
Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips for the Cisco Unified IP Phone Expansion Module 7914
General Troubleshooting Tips for the Cisco Unified IP Phone
Expansion Module 7914
Table 9-3 provides general troubleshooting information for the Cisco Unified IP Phone Expansion
Module 7914.
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 to peer image distribution
fails.
If the peer to peer image distribution 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 to peer image distribution 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.
Table 9-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary Explanation
Table 9-3 Cisco Unified IP Phone Expansion Module 7914 Troubleshooting
Problem Solution
No display on the Cisco Unified
IP Phone Expansion Module
7914.
Verify that all of the cable connections are correct.
Verify that you have power to the Cisco Unified IP Phone
Expansion Module 7914.