This paper will attempt to study the effects & performance of three queuing techniques (First In First Out Queuing, Priority Queuing, Weighted Fair Queuing) with VOIP application in WiMAX throughOPNET 14.5 simulator. In recent years VOIP (Voice over Internet Protocol) is one of the most modern and interesting technology. This work inspects the execution of VOIP traffic characteristics over WiMAX (Worldwide Interoperability for Microwave Access). Applications like web browsing (HTTP), email and FTP are very careless or insensitive towards any kind of delay in transmission of information while VOIP technology is very delicate and sensitive towards delay, packet losses and jitter.

For this reason three different queuing methods are put into operation to manage, regulate, arrange and also to prioritizing the packets in buffers before their transmission. Here FIFO, PQ and WFQ queuing are implemented with the help of OPNET simulator and various parameters like jitter, mean opinion score, packet delay variation and packet end to end delay are studied. After this analysis and evaluation we can pick the best and right queuing scheme. In this document we are also investigating that how performance of various queuing schemes are affected with different numbers of nodes.

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