】会话初始协议(srP)是IETF制订的多媒体通信系统框架协议之一，也是3GPP的rP多媒体子系统(IMs)的重要组成

部分。面对复杂、开放的因特网环境，SIP协议自身缺乏有力的安全机制，使其在安全性方面显得较为薄弱。该文从分析SIP

的安全威胁入手，针对SIP协议报文明文传送、缺乏有力的身份认证这两大脆弱性，从数据加密和身份鉴定两方面研究了相应

的安全解决方案，讨论了如何利用现有技术和手段改善SIP的安全性，并提出了进一步改善SIP安全性的一些思路。-】 Session Initiation Protocol (srP) is the IETF to develop a multimedia communication system, one of the framework agreement, rP is the 3GPP s Multimedia Subsystem (IMs) an important part. The face of complex, open Internet environment, SIP protocol lack strong security mechanisms, so that security seems weak. In this paper, from the analysis of security threats SIP start with SIP protocol for text transmission of civilization reported the lack of strong authentication vulnerability of these two, from data encryption and the identification of two studies the corresponding security solutions, discussed how to make use of the existing technology and means to improve the security of SIP and SIP to further improve the safety of some ideas.