Glossary

TFTP

ToS

Trivial File Transfer Protocol. Simplified version of FTP that allows files to be transferred from one computer to another over a network, usually without the use of client authentication (for example, username and password).

Type of service. See CoS.

U

UAC

 

 

User agent client. A client application that initiates the SIP request.

UAS

 

 

User agent server (or user agent). A server application that contacts the user

 

 

 

when a SIP request is received, and then returns a response on behalf of the user.

 

 

 

The response accepts, rejects, or redirects the request.

UDP

 

 

User Datagram Protocol. Connectionless transport layer protocol in the TCP/IP

 

 

 

protocol stack. UDP is a simple protocol that exchanges datagrams without

 

 

 

acknowledgments or guaranteed delivery, requiring that error processing and

 

 

 

retransmission be handled by other protocols. UDP is defined in RFC 768.

u-law

 

 

See mu-law.

\

 

 

 

 

 

 

 

 

 

V

 

 

 

 

VAD

 

 

Voice activity detection. When enabled on a voice port or a dial peer, silence is

 

 

 

not transmitted over the network, only audible speech. When VAD is enabled,

 

 

 

the sound quality is slightly degraded but the connection monopolizes much less

 

 

 

bandwidth.

VoIP

 

 

Voice over IP. The capability to carry normal telephony-style voice over an

 

 

 

IP-based Internet with POTS-like functionality, reliability, and voice quality.

 

 

 

VoIP enables a router to carry voice traffic (for example, telephone calls and

 

 

 

faxes) over an IP network. In VoIP, the DSP segments the voice signal into

 

 

 

frames, which then are coupled in groups of two and stored in voice packets.

 

 

 

VoIP is a blanket term, which generally refers to Cisco’s standard-based

 

 

 

approach to IP voice traffic.

 

 

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

 

 

GL-10

 

 

OL-4277-01

 

 

 

Page 220
Image 220
Cisco Systems 7905G, 7912G manual GL-10

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.