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In recent years Voice over Internet Protocol (VoIP) has become a popular multimedia application over the Internet. At the same time critical security issues in VoIP have started to emerge. The Session Initiation Protocol (SIP) is a predominant signaling protocol for VoIP. It is used to establish, maintain and terminate VoIP calls, playing a crucial role in VoIP. This paper is aimed at developing a Coloured Petri Net (CPN)-based approach to analyzing security vulnerabilities in SIP, with the ultimate goal of achieving a formal and comprehensive security assessment of SIP specification, and creating a platform for evaluating countermeasures for securing SIP.
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