Chapter 6 Configuring the Cisco IP Phone Models 7905G and 7912G Using a TFTP Server

Using Encryption

Step 5 Put the binary file in the root directory on the TFTP server

When the Cisco IP Phone powers up or refreshes, the phone will download this file as its profile file unless it first finds a phone-specific profile.

If you want to refresh the phone immediately, see the “Refreshing or Resetting the Cisco IP Phone” section on page 6-17.) If you do not perform a refresh procedure, the phone will update its configuration the next time it contacts the TFTP server.

Related Topics

•Creating a Phone-Specific Profile, page 6-11

•Using Encryption, page 6-15

•Refreshing or Resetting the Cisco IP Phone, page 6-17

Using Encryption

The EncryptKey parameter encrypts binary files that are transferred over TFTP. You can change this key for each Cisco IP Phone so that only one specific phone can decode the information.

By default, the phone-specific profile is not encrypted. If encryption is required, you must manually configure the phone with the encryption key. Use either the Profile Encrypt Key parameter on the phone’s Network Configuration menu or the EncryptKey key parameter in the Network Parameters area on a phone’s web page.

Note Because the factory-fresh phone cannot accept encrypted configuration files, the first unencrypted file, if intercepted, can easily be read. (You would still have to know the data structure format in order to decode the binary information from the unencrypted file.) Therefore, the new encryption key in the unencrypted file can be compromised.

When the EncryptKey parameter is set to a nonzero value, the Cisco IP Phone assumes that the binary configuration file on the TFTP server is to be encrypted with this key by means of the RC4 cipher algorithm. The phone will use this key to decrypt the configuration file.

 

 

Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)

 

 

 

 

 

 

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Cisco Systems 7912G, 7905G manual Using Encryption
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7912G, 7905G specifications

Cisco Systems is a leading provider of networking and telecommunications equipment, and among its extensive range of products, the Cisco 7900 Series of IP phones has made a notable impact in enterprise communication. Key models in this series include the Cisco 7905G, 7912G, and 7902G, each designed to enhance productivity through advanced features, intuitive interfaces, and robust technology.

The Cisco 7905G is designed for basic telephony needs and is ideal for administrative environments or areas with high call volumes. It features a large single-line LCD display, providing users with clear visibility of call information. The phone supports Power over Ethernet (PoE), making installation easier and reducing clutter by eliminating the need for an additional power supply. Its hands-free and headset support enhances user convenience, allowing for easy multitasking during calls.

Moving on to the Cisco 7912G, this model is designed for more demanding communication requirements. It features a larger, backlit display, providing improved visibility in various lighting conditions. The Cisco 7912G supports up to 12 programmable line or feature keys, giving users the flexibility to tailor the phone to their specific needs. Additionally, it incorporates advanced audio technologies, such as wideband audio for enhanced voice clarity and a built-in speakerphone, allowing users to communicate effectively in busy environments.

The Cisco 7902G, while offering basic features, is a reliable choice for users who need straightforward, cost-effective telephony solutions. It features an intuitive design with three dedicated buttons for line status, a built-in speakerphone, and support for wideband audio. The phone is geared for users who require essential telephony features without the complexity of additional functionalities, making it suitable for front-desk and general office use.

Overall, these models within the Cisco 7900 series exemplify the company's commitment to providing high-quality enterprise communication tools. With a focus on advanced audio technologies, user-friendly interfaces, and adaptability to various business environments, the Cisco 7905G, 7912G, and 7902G cater to the diverse needs of modern organizations. As companies continue to pursue seamless communication, these IP phones remain a valuable asset in their telephony infrastructure, enhancing collaboration and productivity among teams everywhere.
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