Cisco 7962G Administration Guide - Page 160

The SW Port Configuration option in the Network Configuration menu on, Unified Communications Manager - work without callmanager

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General Troubleshooting Tips Chapter 9 Troubleshooting and Maintenance Table 9-2 Cisco Unified IP Phone Troubleshooting (continued) Summary Loopback condition. One-way audio. Peer Firmware Sharing fails. Cisco VT Advantage/Unified Video Advantage (CVTA) Phone call cannot be established Explanation 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 configured. 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. The phone does not have a DHCP IP address, is unable to register to Cisco Unified Communications Manager, and shows a Configuring IP or Registering message. Verify the following: 1. The Ethernet cable is attached. 2. The Cisco CallManager service is running on the Cisco Unified Communications Manager server. 3. Both phones are registered to the same Cisco Unified Communications Manager. 4. Audio server debug and capture logs are enabled for both phones. If needed, enable Java debug. 9-12 Cisco Unified IP Phone 7962G and 7942G Administration Guide for Cisco Unified Communications Manager 6.1 OL-14625-01

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9-12
Cisco Unified IP Phone 7962G and 7942G Administration Guide for Cisco Unified Communications Manager 6.1
OL-14625-01
Chapter 9
Troubleshooting and Maintenance
General Troubleshooting Tips
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 configured.
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.
Phone call cannot be established
The phone does not have a DHCP IP address, is unable to register to Cisco
Unified Communications Manager, and shows a Configuring IP or Registering
message.
Verify the following:
1.
The Ethernet cable is attached.
2.
The Cisco CallManager service is running on the Cisco Unified
Communications Manager server.
3.
Both phones are registered to the same Cisco Unified Communications
Manager.
4.
Audio server debug and capture logs are enabled for both phones. If
needed, enable Java debug.
Table 9-2
Cisco Unified IP Phone Troubleshooting (continued)
Summary
Explanation