Glossary

CDP

Cisco Discovery Protocol. Used primarily to obtain protocol addresses of

 

neighboring devices and discover the platform of those devices. CDP can also

 

be used to show information about the interfaces your router uses. CDP is media-

 

and protocol-independent, and runs on all Cisco-manufactured equipment

 

including routers, bridges, access servers, and switches.

CED tone

CELP

CallED station identification. A 3-second, 2100-Hz tone generated by a fax machine while answering a call, which is used in the handshaking used to set the call; the response from a called fax machine to a CNG tone.

Code excited linear prediction compression. Compression algorithm used in low bit-rate voice encoding. Used in ITU-T Recommendations G.728, G.729, and G.723.1.

CLIP

Calling Line Identification Presentation. Shows your identity to callers with

 

Caller ID.

CLIR

Calling Line Identification Restriction. Hides your identity from callers with

 

Caller ID.

CNG

Comfort noise generation or calling tone. Distinctive, repeating 1100-Hz tone (on

 

for 0.5 seconds, off for 3 seconds) generated by a fax machine when placing a call.

codec

Coder-decoder. In Voice over IP, Voice over Frame Relay, and Voice over

 

ATM, a DSP software algorithm used to compress/decompress speech or audio

 

signals.

companding

Contraction derived from the opposite processes of compression and expansion.

 

Part of the PCM process whereby analog signal values are rounded logically to

 

discrete scale-step values on a nonlinear scale. The decimal step number then is

 

coded in its binary equivalent before transmission. The process is reversed at the

 

receiving terminal using the same nonlinear scale. Compare with compression

 

and expansion. See also A-law and u-law.

 

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

GL-2

OL-4277-01

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Cisco Systems 7905G, 7912G manual GL-2

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.