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随着互联网的迅速发展和IMS系统的逐渐成熟,基于SIP协议的Presence/IM业务研究和应用日趋增多.Presence/IM业务的需求带来了一系列的问题,而标准的制定工作更是首当其冲.IETF提供了很多规范来支持基于SIP协议的Presence/IM功能,这些规范被称为SIMPLE.本文详细分析了SIMPLE所涉及的规范和标准,并结合SIP事件扩展和IMPP协议总结了SIMPLE提供的具体功能,同时按照规范的功能进行了分类,并说明了这些规范之间的关系.论文还讨论了Presence/IM技术未来的研究方向和发展趋势.
With the rapid development of the Internet and the gradual maturity of the IMS system, the research and application of the Presence / IM service based on the SIP protocol is increasing day by day. The demand of the Presence / IM service poses a series of problems, and the standard formulation work is the first to bear the brunt. IETF provides a number of specifications to support Presence / IM functions based on the SIP protocol, which are called SIMPLE.This paper analyzes the norms and standards involved in SIMPLE in detail, and summarizes the specific functions provided by SIMPLE in combination with the SIP event extension and IMPP protocol , And at the same time classified according to normative functions, and explained the relationship between these norms.The paper also discussed the research direction and development trend of Presence / IM technology in the future.