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In last few years, Voice over Internet Protocol (VoIP) has been gaining popularity as an alternative to traditional telephone by transmitting voice signals as packets over the Internet and private IP-based networks. However, voice packets experience loss, delay, and delay variation, which require buffering, playout scheduling and loss concealment at the receiver. This paper gives an overview of a VoIP application and shows how playout scheduling and loss concealment are jointly used to optimize perceived speech quality. The paper uses this optimization criterion to design a histogram-based playout scheduling algorithm. Then, it identifies the limitations of the VoIP application for this scheme and proposes improvement using path diversity approach that can be implemented via a Service Overlay Network (SON).

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Format:PDFSize:87 KB
Date:Jun 2006
Pages:6

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