Colored Petri Net model of the Session Initiation Protocol (SIP)

The Session Initiation Protocol (SIP) together with its extension for presence and messaging is considered to be an enabler of converged communications. At the core, SIP is a signaling protocol used for establishing sessions in an IP network. SIP has been adopted by 3GPP for multimedia streaming services in cellular networks. This paper presents a formalized and executable Colored Petri Net model of SIP and its components. Since the broader impact of SIP is the realization of SIP-based services, these models can be used to design and analyze such services for desired behaviors prior to implementation.