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This paper describes the work on real-time two-party and multi-party VoIP (voice-over-IP) systems that can achieve high perceptual conversational quality. It focuses on the fundamental understanding of conversational quality and its trade-offs among the design of speech codecs and strategies for network control, playout scheduling, and loss concealments. The authors' have studied three key aspects that address the limitations of existing work and improve the perceptual quality of VoIP systems.
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