IETF SIPPING (Session Initiation Protocol Investigation) working group has propo sed 3 approaches to extend the base functions of SIP: method extension, header e xtension and body extension.

With regard to the representative security threats to SIP, Session Initiation Protocol(SIP) secure authentication model based on strong authentication technology was put forward, and its security was analyzed.

Based on the Mobile IP and its sub Mobile IP, this scheme adopted the Session Initiation Protocol(SIP)and optimized the joint design of network layer mobility management and application layer mobility management.

In this paper,the authors propose a way of access control based on SIP.

SIP is one of the hot research topics in recent years.

SIP is proposed by IETF as IP phone call order protocol which is totally a text modality that to be used to establish, modify and terminate multimedia calls and conversation.

Research On the Security Testing Approach of SIP;

In this paper,the floor control in SIP-based MCS is realized in the architecture of JAIN SIP by using the scalability of the Session Initiation Protocol(SIP),which is characteristic of diversity in the way of control and adaptability to distributed systems.

SIP is subject to many security threats because of its characteristic and application environment, This paper first analyzes the security threats faced with by SIP, particularly an important security threat-Registration Hijacking Attack.