Cisco SPA303-G2

Cisco SPA303-G2 is a balanced low-cost but functional model of a modern IP-phone designed for small businesses.

Cisco SPA303-G2 is designed to operate with three communication lines; it has a built-in switch for two Ethernet-ports and is equipped with a large LCD-display. Having all the necessary functions for modern IP-device, this model has a large number of adjustable parameters. The device is ideal for use with VoiceView Express, as well as Cisco XML business applications.
Phone keys have unobtrusive lighting and can be configured for fast access to your contacts phonebook. It is particularly easy to use the phone functions that are provided by a special four-way navigation joystick. Built-in speakerphone offers its users a great sound of voice without noise and distortion.

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RTP Delivers Multimedia Data In Real Time

A Real-time Transport Protocol (RTP) is a protocol standard defined by the Internet Engineering Task Force (IETF) that outlines a management system for programs using real-time transmission of data through mutlicast or unicast network services in multimedia situations. Originally designed by the IETF for videoconferencing for multiple participants, the protocol is largely used in Voice over Internet Protocol applications. Despite its name, the protocol cannot guarantee real-time delivery of data, however, the RTP does compensate for jitters and can detect when data arrives out of sequence, both issues being popular in VoIP communication. In IP telephony, RTP works with a signaling protocol, such as SIP or H.323, in order to set up connections in a network.

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