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WAV file samples depicting MOS values?

Has anyone come across WAV files that depict VoIP calls matched to various MOS values?

I want to be able to play the files to demonstrate the call quality levels. I know that MOS=4 is good, and MOS=3.2 is less-good. I can't tell whether either of those will be perceived as good enough, or how easy it is to distinguish between the two.

I realize that delay would be a tough aspect to detect in such a recorded call. I'm looking for tone quality, hollowness, echo, scratchiness, pops, gaps/lapses. All of those latter aspects would seem to be related to the codec and potentially packet loss, and the playback-speaker. I'm familiar with differences of speakerphones even in the fully wired/circuit switched world.

Thanks,

Richard Berke

T. Rowe Price Investment Technologies

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