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What is MOS (Mean Opinion Score)?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

MOS (Mean Opinion Score) is the standard measure of voice call quality, rated 1 (bad) to 5 (excellent). 4.0 and above is toll quality; below 3.5 is noticeably degraded. Originally a human listening test, MOS is now usually estimated automatically (per ITU-T models) from measured latency, jitter, and packet loss. It is the single number carriers use to compare routes and diagnose a poor call path. See /answers/voip-quality, /answers/what-is-jitter, and /products/voice.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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