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Voice over IP is expected to be very promising application in the next generation communication networks. The objective of this paper is to analyse the VoIP performance among the most competing next generation wireless networks like WiMAX, WLAN and its integrated frameworks etc. WiMAX having higher bandwidth provides higher capacity but with degraded quality of service while WLAN provides low capacity and coverage. Hence, an integrated network using WiMAX backbone and WLAN hotspots has been developed and VoIP application has been setup. As OPNET 14.5.A provides a real life simulation environment, the authors have opted OPNET as the simulation platform for all performance studies in this work.
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