VoIP: MOS
Revision as of 08:25, 10 March 2010 by Onnowpurbo (talk | contribs) (New page: 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 o...)
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
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 |