In the Next Generation Network (NGN), all networks are speculatively expected to be converged to create a ubiquitous communicating environment that will enable one to avail seamless multimedia communication from any internet connectivity enabled device to another in
any network. In this convergence, gateway is the key element in the network to enable ubiquitous communication. This thesis discusses about the special effort for the design and implementation of a unique PC-to-3G video call gateway for universal multimedia communication along with its supporting soft reduced-SIP (Session Initiation Protocol) client. In 3G circuit switched network, 3G-324M umbrella protocol stack has been adopted by 3GPP for supporting video conversation. 3G-324M consists of two core components ITU-T H.245 (for call control) and ITU-T H.223 (for packet multiplexing/demultiplexing). Meanwhile, SIP is the commonly used session initiation protocol for multimedia communication in IP network performing similar functions as H.245.
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