Mean Opinion Score (MOS)

The metric used for estimating voice quality is a Mean Opinion Score (MOS) based on the ITU-T E-model (Recommendation G.107). The inputs are network statistics such as speech codec usage, network delay, jitter, and packet loss. The modified E-model outputs an R-value, which is straightforwardly converted to a MOS value.

The MOS scale is laid out in the following table:

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