“…Different queuing models, like First-in-First-out (FIFO), request type based priority queues, were analyzed through analytical methods and simulation methods, for recognizing and controlling overload condition in SIP servers [18][20] [27]. D. Y. Yavas et.al proposed a fluid-flow modeling [29] and priority based modeling [30] for processing SIP requests with a queuing system that gives higher priority for initial requests instead of retransmitted requests. However if the original requests are dropped in the network, retransmitted requests will starve in low priority queues for longer durations.…”