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会话初始协议SIP用以邀请用户参加多媒体会议，并且内嵌SDP（会话描述协议）来描述参数配置。SIP的设计目标是通过对用户的重定位和转发邀请来支持对移动用户的邀请。介绍了SIP的工作原理并且给出一种会议初始化的实现方法。
Session Initiation Protocol SIP is used to invite users to participate in multimedia conferences, and embedded SDP (Session Description Protocol) to describe the parameter configuration. SIP is designed to support invitations to mobile users through user relocation and forwarding invitations. This paper introduces the working principle of SIP and gives a method of meeting initialization.