bfb86586_Test___Test_Your_ISP_Bandwidth__Why_It_Matters
[What's Measured] MOS [What Is It?] A numerical score of the perceived quality of a voice call. [How It's Measured] Calculated using the results of the packet loss, latency and jitter tests on a scale from 1 (worst) to 5 (best). [Why It Matters] 
Used to predict the quality of voice calls over your current network. A score of 4.4 is the perceived maximum for a VoIP call. A score less than 3.19 is "Poor", between 3.19 and 3.99 is "Fair", and 4.0 or higher is "Good".
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Why It Matters