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This paper focuses on the comparative statistical analysis of the performance of VoIP calls under various situations, namely, during a handover, under different background traffic conditions (normal and heavy traffic load/saturation conditions) at a wireless Access Point (AP). Using empirical-based measurements, it demonstrates that various network conditions exhibit distinct statistical behaviour in terms of SNR, packet losses and end-to-end delays, and thus, impact the VoIP user quality in a different manner. The paper shows that both network conditions and codec type, as well as their interaction, have a significant effect on the PESQ MOS values. Moreover, it indicates statistically highly significant differences between the predictions of the PESQ and E-model (e.g., in the heavy packet loss scenarios, E-model underestimates quality, reporting a very low MOS value).
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