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).<br><br>p<br><blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><dgarstang@oneeighty.com><asterisk-users@lists.digium.com><br>-- <br>Trixter http://www.0xdecafbad.com Bret McDanel<br>Belfast IE +44 28 9099 6461 DE +49 801 777 555 3402<br>Utrecht NL +31 306 553058 US WA +1 360 207 0479<br>US NY +1 516 687 5200 FreeWorldDialup: 635378<br>http://www.trxtel.com the VoIP provider that pays you!<br>From: Daniel Salama <lists@infoway.net><br>To: Asterisk Users Mailing List - Non-Commercial Discussion<br>
<asterisk-users@lists.digium.com><br>Date: Sat, 17 Jun 2006 01:55:28 -0400<br>Subject: Re: [Asterisk-Users] MOS Scores and LCR<br><br> Thanks for the lecture. Yes, I thought MOS was more of a perception <br>type of measurement, but I can't say I know enough to opinion-ate and <br>thus the reason for the question.<br><br>Also, thanks for the links. They seem helpful. Since I have several <br>scripts in Cacti and Nagios, I'm gonna see if I can come up with <br>something that could create some performance data per provider. Then <br>I'll give it a such at integrating that with Asterisk, unless someone <br>out there has done something like it.<br><br>Thanks,<br>Daniel<br><br>On Jun 17, 2006, at 2:00 AM, trixter aka Bret McDanel wrote:<br><br>> On Sat, 2006-06-17 at 01:26 -0400, Daniel Salama wrote:<br>>> Is there any tool that can do LCR for Asterisk but also take into<br>>> account MOS scores?<br>>><br>>> Is it possible to automatically
generate MOS scores on random "calls"<br>>> so as to keep an updated database on a per provider, per destination,<br>>> per time-of-day score? Hopefully, with that information we can create<br>>> a better LCR module or script?<br>><br>> MOS (Mean Opinion Score) is generally a bunch of people sitting there<br>> listening to audio and rating it 1-5 (there is a newer method that is<br>> "twice as good" becuase it goes 1-10, basically all values are <br>> double).<br>> Its their opinion. This generally cant be dont automagically and <br>> still<br>> be MOS. You can try to track frame drops and other things on your end<br>> to rate call quality and try to come up with something, but that<br>> technically isnt MOS.<br>><br>> AFAIK asterisk doesnt keep statistics of jitter, frame drops or <br>> anything<br>> else, that might be a good project for someone to take on, <br>> especially if<br>> you have multiple
providers so you can rate quality in a more <br>> meaningful<br>> way. The human ear really isnt the best tool for much of this.<br>><br>> http://searchnetworking.techtarget.com/sDefinition/ <br>> 0,,sid7_gci786677,00.html<br>> http://www.tmcnet.com/tmcnet/articles/2005/voice-quality- <br>> measurement-voip-alan-clark-telchemy.htm<br>> http://channels.lockergnome.com/it/archives/ <br>> 20050715_voipqos_mos_mean_opinion_score_explained.phtml<br>><br>><br>> -- <br>> Trixter http://www.0xdecafbad.com Bret McDanel<br>> Belfast IE +44 28 9099 6461 DE +49 801 777 555 3402<br>> Utrecht NL +31 306 553058 US WA +1 360 207 0479<br>> US NY +1 516 687 5200 FreeWorldDialup: 635378<br>> http://www.trxtel.com the VoIP provider that pays you!<br>> _______________________________________________<br>> --Bandwidth and Colocation provided by Easynews.com --<br>><br>> Asterisk-Users mailing list<br>> To
UNSUBSCRIBE or update options visit:<br>> http://lists.digium.com/mailman/listinfo/asterisk-users<br><br><br>_______________________________________________<br>--Bandwidth and Colocation provided by Easynews.com --<br><br>Asterisk-Users mailing list<br>To UNSUBSCRIBE or update options visit:<br> http://lists.digium.com/mailman/listinfo/asterisk-users<br></asterisk-users@lists.digium.com></dgarstang@oneeighty.com></blockquote><br><p> 
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