中文摘要：

会话初始协议（SIP）协议将成为NGN的核心信令协议之一。通过对SIP协议安全问题的深入探究，针对其安全威胁讨论了相应的测试方案，并在此基础上，提出了SIP的安全性测试模型。

英文摘要：

Session Initiation Protocol（SIP） is to be one of the promising signaling protocol in the Next Generation Network （NGN）. In this article , based on probing into Security issues of SIP, testing programs against security threats in SIP are discussed, and the model of the Security Testing of SIP are put forward.