The Research And The Realization Of Explanation Of MGCP Protocol In VoIP

In the past years, packet-switching was taking the place of circuit-switching as the important means to transport data, and more and more studies were devoted in this field. People enjoy the high performance-cost rate of packet-switch based network, and they are more likely communicate on it instead of circuit-switch based network to lower communication costs.Further more, with the development of Internet, the popularization of Broad Band technology, people carry out a lot of business more and more such as Voice, Data and so on by network. Being fitted for the new development of the direction, VoIP is a new technology, transferring traditional phone business on PSTN to IP network, achieving Voice, Data, Video and so on multimedia communication by IP network, and basic VoIP system have already corned true.MGCP (Media Gateway Control Protocol) is presented as a media gateway control protocol that the Softswitch device first supports. It is very important for VoIP (Voice Over Internet Protocol) to be used extensively, particularly at home.This paper takes MGCP as research object, according to VoIP.Firstly; it introduces the definition, basic frame, characteristic, application form, development. It analyses H.323, SIP, MGCP associated with VoIP. It simply expounds MGC and the function, command, response, the flow of call and release of MGCP protocol etc .It comprehensively and systemically studies MGCP, and detailedly explains MGCP,achieving the design of data structure,inner, outer,interface and,briefly/detailedly explains and realizes, achieving all frame and flow from technology features,function. While, presenting a prospect for MGCP's development.Finally,with a view to improve problems that it is difficult to update the modules for protocol explanation embedded in network maintainment or test, we design and realize a protocol explanation DLL (Dynamic Link Library), taking the explanation of MGCP as a main objective.The application and test in Ethernet accord with the basic requests.The DLL's design idea and realization method may be directly used to develop explain the application for other protocols.