Tuesday, May 26, 2015

How To Estimate VoIP Quality? Mean Opinion Score (MOS)

Some of you have asked us how we calculate a mean opinion score to estimate voice quality for over-the-top voice over internet protocol (VoIP) service. Well, here is the formula we use.


=IF(Effective latency<160,(93.2-(Effective latency/40)-2.5*Avg. UDP packet loss),(93.2-(Effective latency-120)/10-2.5*Avg. UDP packet loss))

Effective latency
=Avg. latency + Avg. jitter*2+10

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