Modelling chaotic behaviour of SIP retransmission mechanism

The SIP retransmission mechanism can cause SIP network collapse with short term overload. In this paper, we investigate with a fluid modeling approach the chaotic behaviour of the SIP retransmission mechanism in SIP networks. We capture the complex correlation structure in SIP systems through a detailed and novel queuing analysis. To dimension a buffer size which can avoid unnecessary message drop in a SIP server, we develop a sufficient condition for a stable SIP system analytically based on our fluid model. We also apply our fluid model to the simulation of a complex SIP system. We compare the simulation results achieved through our fluid models with those based on OPNET event-driven approach to demonstrate the validity of our approach.