MOS

Mean Opinion Score (MOS) is the overall measurement of the quality of a telephony service. In reference to your internet connection, MOS is a score that reflects the quality of voice communications such as VoIP, Skype, and other services that use your internet connection.​

Back to Internet Speed Test.

quality of service

What is MOS?

The score ranges from 1 to 5, with a theoretical maximum of 4.4 (because of overhead caused by codecs used to encapsulate voice over the wire). It is calculated by average latency, average jitter, and packet loss.

A = (latency + jitter) * 2

If A < 160 then B = 93.2 - ( A / 40 )

If A >= 160 then B = 93.2 - ( A - 120 ) / 10

C = B - ( packet loss * 2.5 )

MOS = 1 + (0.035) * C + (.000007) * C * (C-60) * (100-C)

A MOS score above 4.0 should support most VoIP applications, provided the bandwidth is also available.

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