Abstract
In this work, Session Initiation Protocol model is established by using Timed Colored Petri Nets (TCPN). SIP (Session Initiation Protocol) is a protocol developed to assist in providing advanced telephony services across the Internet. The Session Initiation Protocol (SIP) has become the quasi-standard for Voiceover-Internet Protocol (VoIP) communications. SIP is based on a client–server infrastructure in which user agents represent the end-terminals as clients, proxy servers handle SIP message routing between the user agents, and registrar servers store the client’s contact information into a location service. By use of timed color set and useful time attributes in tokens defined in CPN tools, timer and time-related problems of SIP are modeled and analyzed. Timer is an important part for SIP, especially the INVITE transaction.
Highlights
Communications with Voice over Internet Protocol (IP) (VoIP) have been popular because of developments of Internet
Session Initiation Protocol model is established by using Timed Colored Petri Nets (TCPN)
We have modelled and analysed Session Initiation Protocol (SIP) INVITE transaction using timed Coloured Petri Nets
Summary
Communications with Voice over IP (VoIP) have been popular because of developments of Internet. VoIP uses the Internet Protocol (IP) to transmit voice as packets over an IP network. Our current work is aimed at verifying the functional properties of the INVITE transaction. We use Timed Colored Petri Nets (CPNs) [6] as the modeling and analyzing technique. SIP Invite Transaction is modelled and analysed with CPN in [7,8,9,10]. In [8], SIP INVITE transaction was modelled and analysed when the medium is unreliable. Various forms of real-time multimedia session data such as voice, video, or text messages are carried by several protocols [11,12].
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