Performance analysis of VoIP data over IP networks

Dariusz Strzeciwilk

Abstract


The paper presents the results of research and analysis of voice data transmission quality in IP packet networks. It analyses mechanisms allowing for the assessment of packet telephony data transmission quality. Possible transmission quality levels and adequate quality metrics, applicable in the recommen- dations of standardisation organisations, as well as suggested limit values conditioning acceptable voice data transmission quality were indicated and discussed. A packet network model was designed and tested, taking into account VoIP architecture supporting various audio codecs used for voice compression. Transmission mechanisms based on audio codecs G.711, G.723, G.726, G.728 and G.729 were investigated. It was shown that    for delay-sensitive traffic which fluctuates beyond its nominal rate, selected codecs have an advantage over others and allow   for better transmission quality of VoIP traffic with guaranteed bandwidth and delay.

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