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—This paper deals with the measurement uncertainty of the speech quality (SQ) achievable by an actual Voice-over-Internet-Protocol (VoIP) telephony network. The accuracy of end-to-end speech data provided by the Perceptual Estimation of SQ (PESQ) algorithm suggested in the International Telecommunica-tion Union (ITU) recommendation P.862 is discussed. Then,(More)
A measurement system for in-service characterization of telephone-type networks is described. It is based on in-line Digital Signal Processing of the transmitted signal observed at an easily accessible test-point. The adopted techniques for the estimation of the considered parameters are summarized and discussed, together with an example of a measurement(More)