Abstract:

                     Over Internet (VOIP) is an emerging popular Internet application that provides good services through Mobile Adhoc Network(MANET).MANET provides a suitable platform for the deployment of voice and multimedia session over IP network in many application scenarios that range from safety to comfort related services. But this network also faces many challenges on QoS issues due to packet loss because of transmission errors, short battery life and dynamic changing topologies. WiMAX is a wireless 4G technology, currently using by various industries &institutions which provides many advantages due to its high speed and large coverage area. Combining these technology together, in this paper we estimated the performance of various VOIP codecs with WiMAX in different scenarios (sparse and dense) over MANET.  Mobile ad-hoc networks one can extend the reach of existing fixed telephony. This whole mechanism of extending the reach of fixed telephony is also termed as Fixed to Mobile Convergence FMC)

Key words: IP address allocation; MANET, VoIP, QoS, Codecs, WiMAX