| Summary: | 碩士 === 國立臺灣大學 === 資訊工程學研究所 === 87 === The revolutions of electronic data networks have broken the constraint on communication of human beings. Among those applications, multimedia conferencing is the most important one. In order to speed the development of it, and provide better quality of communication service, international organization ITU-T (International Telecommunication Union) issued H.323-seris protocol recommendations as communication standards over packet-based networks.
In this dissertation, we present the protocol stack of H.323, and propose our results on implementing an H.323 conferencing system and interoperability testing. In addition, we design a media synchronization mechanism, a CPU job scheduler, and an adaptive flow control model to make our system more comfort to nowadays non-guaranteed QoS networking environment so that end users can get a better playout quality. These issues are left open in the standards but play an important rule on real-time media playback quality. Most Importantly, they do not affect interoperability but may have a critical impact on performance.
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