SIP是由IETF提出的 电话信令协议，是NGN中的重要协议。本文在简要介绍SIP协议后，着重介绍SIP协议面临的安 全威胁模型，最后从三个方面给出了安全解决对策。-SIP is the IETF proposed by telephone signaling protocols is an important agreement NGN. In this paper, a brief introduction SIP agreement, the agreement focuses on

Since current studies on NGN mainly focus on passive defense, which has a certain limitation in such aspects as technique realization, the paper starts from a detailed analysis on security vulnerability of NGN, and then discussed possible attacks