Chapter 9 Troubleshooting and Maintenance

Troubleshooting Cisco Unified IP Phone Security

Troubleshooting Cisco Unified IP Phone Security

Table 9-1provides troubleshooting information for the security features on the Cisco Unified IP Phone. For information relating to the solutions for any of these issues, and for additional troubleshooting information about security, refer to Cisco Unified CallManager Security Guide.

Table 9-1 Cisco Unified IP Phone Security Troubleshooting

Problem

Possible Cause

 

 

Device authentication error.

CTL file does not have a

 

Cisco Unified CallManager certificate or

 

has an incorrect certificate.

 

 

Phone cannot authenticate CTL file.

The security token that signed the

 

updated CTL file does not exist in the

 

CTL file on the phone.

 

 

Phone cannot authenticate any of the

Invalid TFTP record.

configuration files other than the

 

CTL file.

 

 

 

Phone reports TFTP authorization

• The TFTP address for the phone does

failure.

not exist in the CTL file.

 

• If you created a new CTL file with a

 

new TFTP record, the existing CTL

 

file on the phone may not contain a

 

record for the new TFTP server.

 

 

Phone does not register with

The CTL file does not contain the correct

Cisco Unified CallManager.

information for the

 

Cisco Unified CallManager server.

 

 

Phone does not request signed

The CTL file does not contain any TFTP

configuration files.

entries with certificates.

 

 

General Troubleshooting Tips

This section provides troubleshooting information for some common issues that might occur on the Cisco Unified IP Phone.

 

Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager

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Cisco Systems 7906G, 7911G manual General Troubleshooting Tips, Problem Possible Cause
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7906G, 7911G specifications

The Cisco Systems 7911G is a versatile IP phone designed to enhance communication in enterprise environments. Targeting workers in various organizational settings, this model is known for its reliability, ease of use, and robust features that cater to both basic and advanced telephony requirements.

One of the key features of the Cisco 7911G is its support for Voice over IP (VoIP) technology. Using this technology allows for the transmission of voice signals over the internet rather than through traditional telephone lines. This not only reduces telephony costs but also offers enhanced functionality that integrates seamlessly with existing communication systems.

The phone is equipped with a monochrome graphical display that provides users with clear visibility of their call status, directory information, and menu options. With a resolution of 128x64 pixels, the screen is large enough to offer important information without overwhelming the user. This simplicity makes it an ideal choice for users who require straightforward functionality without the complexity of advanced features.

Ergonomically designed, the Cisco 7911G features a comfortable keypad with dedicated buttons for frequently used functions such as mute, hold, and transfer. It supports multiple lines, providing users with the ability to manage multiple calls simultaneously. Additionally, it offers programmable line keys that can be customized for speed dial or as soft keys for quick access to features.

The device supports Power over Ethernet (PoE), which allows the phone to receive power through the network cable rather than needing a separate power source. This feature not only simplifies installation but also enhances mobility within the workspace, as it reduces cable clutter.

Another significant characteristic of the Cisco 7911G is its compatibility with Cisco Unified Communications Manager, which ensures centralized management of telephony systems. It also supports a range of audio codecs that help in delivering high-quality audio during calls, reducing latency and improving overall communication quality.

Security is also a focus with the Cisco 7911G, as it features a secure access feature that includes Transport Layer Security (TLS) and Secure Real-Time Transport Protocol (SRTP) for encrypted voice communications. This ensures that sensitive conversations are protected from eavesdropping.

Overall, the Cisco Systems 7911G is a reliable, feature-rich IP phone that provides an excellent solution for organizations looking to upgrade their communication systems. Its combination of user-friendly design, powerful integrations, and security features makes it a cornerstone in the suite of Cisco telecommunications solutions.
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