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voip的原理及技术（The principle and technology of VoIP）.doc

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voip的原理及技术（The principle and technology of VoIP）

voip的原理及技术（The principle and technology of VoIP） The principle and technical heat of VoIP The principle and technology of VoIP The author: anonymous fan: the original hits: 139 update: 2003-12-22: the input water float. Through the Internet speech communication is a very complicated system engineering, its application is very wide, so the technology involved is very much, one of the most fundamental technology is VoIP (Voice over IP) technology, it can be said that the Internet speech communication is one of the most typical and the most promising applications of VoIP Technology the. Therefore, before discussing the use of the Internet for voice communication, it is necessary to first analyze the basic principles of VoIP, and related technical issues in VoIP. I. The basic transmission process of VoIP The traditional telephone network transmits the voice by the circuit exchange way, the request transmission broadband is 64kbit/s. The so-called VoIP is the IP packet switching network as a transmission platform, the analog voice signal compression, packaging and a series of special processing, so that it can use connectionless UDP protocol for transmission. In order to transmit voice signals over an IP network, several elements and functions are required. The simplest form of network consists of two or more devices with VoIP functionality that are connected via a IP network. The basic structure of the VoIP model is shown in figure 2-18. From the diagram, you can find how the VoIP device converts the voice signals into IP data streams and forwards the data streams to the IP destination, and the IP destination converts them back to the voice signals. The network of the two tones must support IP transmission and can be any combination of the IP router and the network link. Therefore, the transmission process of VoIP can be simply divided into the following phases. Figure 2-18. Model structure of VoIP 1, voice data conversion The speech signal is analog waveform, to transm