[Asterisk-Dev] Measuring MOS Scores

[Steve Underwood]

Hi James,

MOS = Mean Opinion Score

Do machines have opinions? :-)

MOS is a costly, and definitely not an automatable, process. It requires 
an extensive formalised test of the system with a large number of 
humans. If you have seen packages which say they automate MOS testing, 
they are lying. Sometimes they just seem to use the term MOS for 
something other than a real MOS.

I believe the R-factor, and other similar factors, are a problem for 
free software. Although P.853 defines a testing method, I understand 
there are patents on the methods used, as the wiki page mentions.

Regards,
Steve


James H. Thompson wrote:

>We are looking for automated solutions to measure call quality (MOS scores
>or R-Factor) to/from several points in our network.  After looking at whats
>its going to cost buy an off-the-shelf system to do this, and suffering
>sticker shock, I thought maybe this is something that could be measured on a
>call between two Asterisk systems.
>
>If anyone has suggestions, or is interesting in doing development (possibly
>for $) on this let me know.
>
>Information on MOS and R-Factor
>http://www.voip-info.org/wiki-Call+Quality+Metrics
>  
>