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1 SIP概述 SIP(Session Initiation Protocol,会话发起协议)是由IETF(Internet工程任务组)提出的IP电话信令协议。它的主要目的是为了解决IP网中的信令控制,以及同SoftSwitch的通信,从而构成下一代的增值业务平台,对电信,银行,金融等行业提供更好的增值业务。正如其名字所隐含的,SIP用于发起会话,它能控制多个参与者参加的多媒体会话的建立和终结,并能动态调整和修改会话属性,如会话带宽要求、传输的媒体类型(语音、视频和数据
1 SIP Overview SIP (Session Initiation Protocol) is an IP telephony signaling protocol proposed by IETF (Internet Engineering Task Force). Its main purpose is to solve signaling control in the IP network and communicate with the SoftSwitch to form the next generation of value-added service platform that provides better value-added services to the telecommunications, banking and finance industries. As its name implies, SIP is used to initiate a session. It controls the establishment and termination of multimedia sessions attended by multiple participants and dynamically adjusts and modifies session attributes such as session bandwidth requirements, media type of transmission (voice , Video and data