详细描述了基于SIP的VoIP复杂的安全问题，并且阐述了身份认证、加载MIME消息体

来扩展SIP消息和加密包等解决方法。提出一套新的安全框架，在链路层和网络层(交换机)、传输和会话层(防火墙)及应用层(基f-jl~．务器的软件等)多个层实施安全措施来根本解决诸多安全隐患。-A detailed descr iption of SIP-based VoIP complex security issues and expounded on authentication, loading MIME message body to extend the SIP messages and packages, such as encryption solution. Proposed a new security framework, in the link layer and network layer (switches), transport and session layer (firewall) and the application layer (base f-jl ~. Server software, etc.) more than the implementation of safety measures to the fundamental layer solve the many security risks.