[Asterisk-Users] MOS Scores and LCR

[Philippe Lindheimer]

I don't have any links, but there has been work done to 'measure' MOS scores and I believe they are a little more sophisticated than simply tracking latency, jitter and packet loss. An example of one box that does measure/predict MOS is Edgewater Network's Edgemarc. (I have no experience with it so I don't know how good of a job it does nor if it uses any of the more 'sophisticated' measures).

p

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From: Daniel Salama <lists at infoway.net>
To: Asterisk Users Mailing List - Non-Commercial Discussion
 <asterisk-users at lists.digium.com>
Date: Sat, 17 Jun 2006 01:55:28 -0400
Subject: Re: [Asterisk-Users] MOS Scores and LCR

 Thanks for the lecture. Yes, I thought MOS was more of a perception  
type of measurement, but I can't say I know enough to opinion-ate and  
thus the reason for the question.

Also, thanks for the links. They seem helpful. Since I have several  
scripts in Cacti and Nagios, I'm gonna see if I can come up with  
something that could create some performance data per provider. Then  
I'll give it a such at integrating that with Asterisk, unless someone  
out there has done something like it.

Thanks,
Daniel

On Jun 17, 2006, at 2:00 AM, trixter aka Bret McDanel wrote:

> On Sat, 2006-06-17 at 01:26 -0400, Daniel Salama wrote:
>> Is there any tool that can do LCR for Asterisk but also take into
>> account MOS scores?
>>
>> Is it possible to automatically generate MOS scores on random "calls"
>> so as to keep an updated database on a per provider, per destination,
>> per time-of-day score? Hopefully, with that information we can create
>> a better LCR module or script?
>
> MOS (Mean Opinion Score) is generally a bunch of people sitting there
> listening to audio and rating it 1-5 (there is a newer method that is
> "twice as good" becuase it goes 1-10, basically all values are  
> double).
> Its their opinion.  This generally cant be dont automagically and  
> still
> be MOS.  You can try to track frame drops and other things on your end
> to rate call quality and try to come up with something, but that
> technically isnt MOS.
>
> AFAIK asterisk doesnt keep statistics of jitter, frame drops or  
> anything
> else, that might be a good project for someone to take on,  
> especially if
> you have multiple providers so you can rate quality in a more  
> meaningful
> way.  The human ear really isnt the best tool for much of this.
>
> http://searchnetworking.techtarget.com/sDefinition/ 
> 0,,sid7_gci786677,00.html
> http://www.tmcnet.com/tmcnet/articles/2005/voice-quality- 
> measurement-voip-alan-clark-telchemy.htm
> http://channels.lockergnome.com/it/archives/ 
> 20050715_voipqos_mos_mean_opinion_score_explained.phtml
>
>
> -- 
> Trixter http://www.0xdecafbad.com     Bret McDanel
> Belfast IE +44 28 9099 6461    DE +49 801 777 555 3402
> Utrecht NL +31 306 553058      US WA +1 360 207 0479
> US NY +1 516 687 5200          FreeWorldDialup: 635378
> http://www.trxtel.com the VoIP provider that pays you!
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