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会话初始协议(SIP)与会话描述协议(SDP)是IETF提出的用于VoIP系统或IP多媒体子系统(IMS)的呼叫/会话管理和信息编码协议。SIP基于文本,简单灵活,易于升级扩展,是固定和移动网络向下一代网络演进的核心控制协议。SDP可用于多媒体会话的SIP消息编码,以便进行会话和媒体协商。文章在深入分析SIP/SDP协议及其扩展机制的基础上,针对专用IMS网络的特殊应用需求,提出了兼容服务质量(QoS)和密钥分发功能的SIP/SDP协议扩展方法,并对支持扩展功能的业务流程进行描述,最后对SIP/SDP扩展应用的相关问题进行了探讨。
Session Initiation Protocol (SIP) and Session Description Protocol (SDP) is a call / session management and information encoding protocol proposed by the IETF for use in a VoIP system or IP Multimedia Subsystem (IMS). SIP is text-based, simple and flexible, easy to upgrade and extend, and is the core control protocol for the evolution of fixed and mobile networks to next-generation networks. SDP can encode SIP messages for multimedia sessions for session and media negotiation. Based on the deep analysis of the SIP / SDP protocol and its extension mechanism, this paper proposes a SIP / SDP protocol extension method that is compatible with Quality of Service (QoS) and key distribution for the special application needs of the private IMS network. Function of the business process description, and finally SIP / SDP extension of the application of the issue were discussed.