Research And Design Of SIP Instant Messaging System Based On UML

Along with the network technology's development and the network's popularization,the network has been prevailing. Network can provide many functions such as working, recreation and communication for the people by means of Network Services. However the network's rapid development also causes the people's demands for the network more and more,people want to get facile and all-sided service,single network service is difficult to satisfy the needs. Becuse of people's requirement,the Instant Messaging system which is research in this article has become an electronic communication system which includes individual space,games,news,community,Blog, multimedia telephone and multimedia conference.The next generation network want to achieve services'composition. SIP is proposed by IETF as IP phone call order protocol which is totally a text modality that to be used to established,modify and terminate multimedia calls and conversation, It has many characters,for example:Requst and Response Protocol,Simple and Extensible,Design for Mobility,Capability Negotiation,etc.SIP is as a core protocol of the next generation network. .The Instant Message system has a big vantage in the services'composition based on SIP.The article analyse the SIP protocal,it elaborates the big vantage of the Instant Messaging system based on SIP ,for the technology of instant message is populated and more service is provided in the next generation network. The article provides the structure of Instant Messaging system. According to the method of oriented object establishe UML model,analysing requirement and providing use case and class diagram.