Question

What Is MOS Score In Voice Calls?

Applies To

• Voice API

Answer

The Mean Opinion Score (MOS) is one metric for measuring overall voice call quality. MOS score ranges between 1 to 5 of the perceived quality of a voice call (1-lowest and 5-highest). 

With a call sample, our Vonage Support Engineers can look up the MOS Score for that specific call. This helps Vonage and the customer determine if a network quality problem may be affecting the quality of a call concerning symptoms such as garbled audio, missing audio, or one-way audio.  A MOS Score of less than 4 may indicate network quality which may impact the call quality.