Good call, bad call The MOS and the R-Value score are the most common scoring methods for voice quality. The compression characteristics of voice codecs limit possible scores for VOIP networks, so the highest grades are never actually achievable.
MOS Subjective voice assessment score traditionally based on user-perception reports, with a score of 1 meaning unusable and 5 meaning excellent.
R-Value Part of the ITU (International Telecommunication Union) G.107 specification to measure call quality. On a 1-to-100 scale, R-Value is an objective measurement technique that accounts for loudness and various signal impairments and even includes a fudge factor to weigh for user expectations.
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