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ABSTRACT
<p>Delay, echo, codec type, and packet loss all come into play in achieving the quality of PSTN calls in packet-based telephony.</p>
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CITATION

J. Janssen, D. De Vleeschauwer, M. Büchli and G. H. Petit, "Assessing Voice Quality in Packet-Based Telephony," in IEEE Internet Computing, vol. 6, no. , pp. 48-57, 2002.
doi:10.1109/MIC.2002.1003131
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