Difference between revisions of "VoIP Cookbook: Mean Opinion Score (MOS)"

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To find out how good your voice quality is, you can measure it in terms of Mean Opinion Score (MOS) and R Factor, both of which are the unit measurement derived from the users perception on the voice they hear. MOS can be found at http://www.voiptroubleshooter.com/diagnosis/emodel.html. Below we have provided you with examples of MOS measurements based on a number of Codecs.
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{| border="1" cellpadding=2 style="border-collapse: collapse"
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! User's opinion
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! R Factor
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! MOS Score
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|-
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| Maximum values obtained by G.711
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| 93
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| 4.4
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|-
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| Highly satisfactory
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| 90-100
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| 4.3-5.0
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|-
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| Satisfactory
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| 80-90
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| 4.0-4.3
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|-
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| Good
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| 70-80
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| 3.6-4.0
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|-
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| Unasatisfactory
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| 60-70
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| 3.1-3.6
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|-
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| Poor
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| 50-60
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| 2.6-3.1
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|-
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| Not recommended
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| 0 – 50
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| 1.0-2.6
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|}
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 +
'''MOS Score and R Factor are measured
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based on users' experience on a communication session'''
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[[Image:Voip-mos-calculator.jpg|center|200px|thumb|VoIP Quality and Bandwidth Calculator]]
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Entering other types of codec and values pertaining to our bandwidth for every codec, we obtained the following MOS and R Factor calculation:
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{| border="1" cellpadding=2 style="border-collapse: collapse"
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! Codec
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! Frame
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! Packet Loss
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! MOS
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! R Factor
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! Kbps
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|-
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| G.711
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| 20ms
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| 0%
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| 4.4
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| 93
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| 80.8
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|-
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| G.723 5kbps
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| 20ms
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| 0%
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| 3.8
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| 74
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| 16.5
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|-
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| G.723 6kbps
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| 20ms
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| 0%
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| 4.0
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| 78
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| 17.5
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|-
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| G.729
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| 20ms
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| 0%
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| 4.1
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| 83
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| 24.8
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|}
  
  

Latest revision as of 08:24, 10 March 2010

To find out how good your voice quality is, you can measure it in terms of Mean Opinion Score (MOS) and R Factor, both of which are the unit measurement derived from the users perception on the voice they hear. MOS can be found at http://www.voiptroubleshooter.com/diagnosis/emodel.html. Below we have provided you with examples of MOS measurements based on a number of Codecs.

User's opinion R Factor MOS Score
Maximum values obtained by G.711 93 4.4
Highly satisfactory 90-100 4.3-5.0
Satisfactory 80-90 4.0-4.3
Good 70-80 3.6-4.0
Unasatisfactory 60-70 3.1-3.6
Poor 50-60 2.6-3.1
Not recommended 0 – 50 1.0-2.6

MOS Score and R Factor are measured based on users' experience on a communication session

VoIP Quality and Bandwidth Calculator

Entering other types of codec and values pertaining to our bandwidth for every codec, we obtained the following MOS and R Factor calculation:

Codec Frame Packet Loss MOS R Factor Kbps
G.711 20ms 0% 4.4 93 80.8
G.723 5kbps 20ms 0% 3.8 74 16.5
G.723 6kbps 20ms 0% 4.0 78 17.5
G.729 20ms 0% 4.1 83 24.8


See Also

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