| In modern society, information means the chance. The fast development of society needs the modes of communication to be faster, more and more precise. Today, although there are many convenient communication modes, but none of them can satisfy these demands. The basic reasons that enforce the evolution of the telecommunication network are the demands of variety for service, the reduction of the management and the facility of the system. Now, NGN is an important thesis in the industry for its market prospects and the all uring multimedia applications. So more technologies' research and more efforts are made in this field for its key and market.Softswitch and IP are two important technologies that support the NGN. Meanwhile the emergence of VOIP and its success provide us good consultation for NGN achievement. IETF brings up the SIP protocol whose design idea is making good use of the IP's simplification and its ease for expanding more application to establish the IP's core role in NGN.The paper researched SIP and SIP terminal in NGN. First, compared SIP with other protocols; analyzed the structure of the SIP system and introduced the SIP's basic functions; secondly, stated the SIP stack and its practical applications; then studied the design of Transfer function of the SIP software terminal deeply.Finally, gave the summary of the paper and the forecast of the future. |
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