Study on the security of SIP

With the widespread use of multimedia communications,SIP(Session Initiation Protocol) is becoming one of the most important protocols in the VoIP field.Facing the complex and open Internet environment,the security of SIP needs to be improved and enhanced.This paper analyzed the security threats to SIP at first,and then proved the existence of these threats by simulated attacking experiments,finally improved the authentication mechanism and provided security solution to SIP.