VOIP called the IP telephone or the IP network telephone, is the Voice Over IP abbreviation, this kind of technology through carries on the code digitization, the compression to the pronunciation signal processes the compression frame, then the transformation is the IP data wraps in the IP network to carry on the transmission, thus had achieved carries on the pronunciation correspondence in the IP network the goal.The IP telephone enormous improvement network band width use factor, reduced the correspondence expense greatly, its widespread application also promoted the wide band multimedia application development.
the VoIP biggest superiority is can widely use Internet and the global IP interconnection environment, provides are more than the traditional service, a better service.VoIP may in the IP network the cheap transmission pronunciation, the facsimile, the video frequency, and services and so on data, like the unification news, the hypothesized telephone, the hypothesized pronunciation/facsimile mailbox, look up a number the service, the Internet call center, the Internet call management, the TV conference, electronic commerce, the facsimile memory repeater and each kind of information memory repeater and so on.
VoIP basic transmission process: The
tradition telephone network is by the electric circuit switching scheme transmission pronunciation, requests the transmission wide band is 64kbit/s.But so-called VoIP is as transmits the platform take the IP grouping exchange network, carries on the compression, the pack to the simulation pronunciation signal and so on a series of special handling, enables it to be possible to use the connectionless UDP agreement to carry on the transmission.In order to
transmits the pronunciation signal in a IP network, requests several elements and the function.The simple form network has the VoIP function equipment by two or many to be composed, this equipment through a IP network connection.How is the VoIP equipment the pronunciation signal transformation is the IP data stream, and pasts these data sends the IP destination, the IP destination transforms them returns the pronunciation signal.Both the sound network must support the IP transmission, also may be the IP router and the network link willfully combination.The pronunciation signal must pass through in IP network transmission from the simulated signal to the digital signal transformation, the digital pronunciation seals the IP grouping, the IP grouping through the network transmission, the IP grouping solution package of and the digital pronunciation returns to original state to processes and so on simulated signal.

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