Chapter 9 Troubleshooting and Maintenance

General Troubleshooting Tips for the Cisco Unified IP Phone Expansion Module 7914

Table 9-2

Cisco Unified IP Phone Troubleshooting (continued)

 

 

 

Summary

 

Explanation

 

 

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

If the peer to peer image distribution fails, the phone will default to

fails.

 

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

If you are having problems getting CVTA to work, make sure that

Video Advantage (CVTA)

the PC Port is enabled, and that CDP is enabled on the PC port.

 

 

 

General Troubleshooting Tips for the Cisco Unified IP Phone Expansion Module 7914

Table 9-3provides general troubleshooting information for the Cisco Unified IP Phone Expansion Module 7914.

Table 9-3 Cisco Unified IP Phone Expansion Module 7914 Troubleshooting

Problem

Solution

 

 

No display on the Cisco Unified

Verify that all of the cable connections are correct.

IP Phone Expansion Module

Verify that you have power to the Cisco Unified IP Phone

7914.

Expansion Module 7914.

 

 

 

 

Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0

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Cisco Systems 7970G, 7971G-GE Halfduxcollisionexceedthreshold, To resolve this problem, re-enable the port from the switch
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7970G, 7971G-GE specifications

The Cisco Systems 7971G-GE is a sophisticated IP phone designed for enterprise communication, offering a range of features that enhance productivity and collaboration. As part of the Cisco Unified Communications portfolio, this phone is known for its impressive technology and reliable performance.

One of the main features of the 7971G-GE is its high-resolution color display. The 5-inch LCD screen provides users with a visually appealing and intuitive interface, allowing for easy navigation through menus and contacts. The phone supports up to six lines, making it ideal for users who require multiple lines for simultaneous calls. Users can effortlessly manage calls with the ability to switch between lines and access important call features like hold, transfer, and conference calling.

In terms of audio quality, the Cisco 7971G-GE is equipped with high-definition voice technology. This feature ensures crystal-clear sound during calls, reducing background noise and enhancing the clarity of conversations. The phone also supports wideband audio codecs, enabling a richer voice experience that is particularly valuable in business environments.

The phone is designed with user convenience in mind. It offers programmable buttons that can be customized to suit individual needs, allowing easy access to frequently used functions or contact lists. Additionally, the presence indicator feature lets users see the availability of their colleagues in real-time, promoting more effective communication and collaboration.

Networking capabilities are another strong point of the Cisco 7971G-GE. The phone supports both Power over Ethernet (PoE) and standard Ethernet connectivity. This enables easy deployment without the need for additional power outlets. Moreover, the device is compatible with various Cisco communication platforms, integrating seamlessly with existing Cisco infrastructure, which is essential for businesses looking to upgrade their communications systems.

Security is a crucial consideration for modern enterprises, and Cisco addresses this with robust encryption features that protect voice and video calls. The phone supports secure signaling and media encryption, ensuring that sensitive conversations remain confidential.

Overall, the Cisco Systems 7971G-GE is a feature-rich IP phone that combines advanced technology with user-friendly design. Its high-definition audio, customizable features, and seamless integration with Cisco networks make it a popular choice for businesses seeking to improve their communication systems. With its reliability and performance, the Cisco 7971G-GE continues to support effective collaboration in an increasingly connected world.
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