This paper investigates the effects of packet loss and delay jitter on speech quality in voice over Internet protocol (VoIP) scenarios. A new formula is proposed to quantify these effects and incorporated into ITU-T G.107, the E-model. In the simulation, codecs ITU-T G.723.1 and G.729 are used; random packet loss and Pareto distributed network delay are introduced. The prediction errors range between -0.20 and + 0.12 MOS. The formula extends the coverage of the current E-model, and is very useful in MOS prediction as well as network planning.

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Conference IEEE Global Telecommunications Conference GLOBECOM'03
Ding, L. (Lijing), & Goubran, R. (2003). Speech Quality Prediction in VoIP Using the Extended E-Model. In Conference Record / IEEE Global Telecommunications Conference (pp. 3974–3978).