Data transfer over internet protocol

Session Initiation Protocol (SIP) is an application layer protocol which is generally used in ?voice over internet protocol? (VoIP) technology. This protocol is utilized in order to establish, modify and terminate variable kinds of sessions such as VoIP, videoconferencing or data. SIP is suggested as the signalling protocol of 3rd generation networks which increases its popularity and application area.Current trends in the telecommunication industry favour VoIP technology. In the future, this technology may substitute for ?public switched telephony network? (PSTN). Since PSTN network has been tuned for performance and evolved to become highly reliable with individual switches experiencing only a few seconds of downtime per year, the performance of VoIP network should be closer to the performance of PSTN in order to realize substitution of PSTN network. At that point, characterization of the performance of VoIP network becomes essential, which is directly related to the performance analysis of the SIP.In this paper, performance analysis is performed using an analytical model of SIP messaging with respect to varying arrival rates and service rates. The SIP messaging is modeled as a queuing network and performance analysis is based on this network model. The main performance criteria used in the analysis are total number of customers in the system and the mean waiting time. Real time SIP messaging data are obtained by using real server and clients systems and it is modeled as a known probability density function (PDF) by analytical analysis. This known PDF is used for realizing queuing network performance analysis. As a conclusion, the performance analysis of real time SIP messaging is realized.Keywords: Session Initiation Protocol, Queuing analysis