分析了会话发起协议及其特点，指出了SIP网络面临的一些典型攻击和安全威胁，并针

对SIP网络面临的安全风险提出了基于PKI公钥基础设施的SIP协议安全的解决方案，完善

了SIP的安全机制，使SIP能进一步为用户提供更加多样、安全的服务。-Analysis of the Session Initiation Protocol and its characteristics, pointing out that the SIP network is facing some of the typical attacks and security threats, and SIP networks for security risks faced by PKI based on public key infrastructure of the SIP protocol security solutions, improved the SIP- security mechanism, so that SIP will further provide users with a more diverse, security services.