<p dir="ltr">For what it's worth, here's some history on it (MOS):</p>
<p dir="ltr">MOS stands for "Mean Opinion Score" and is a concept that's a holdover from good old fashioned analog telephony; 5 is "excellent", 1 is "poor".</p>
<p dir="ltr">Virtually every aspect of a telephone network - right down to the microphone and speaker in an analog telephone set - were engineered for optimal voice quality.</p>
<p dir="ltr">Voice quality wasn't accurately measurable instrumentally or algorithmically; it's a subjective thing that can vary from listener to listener. So, the test was performed in a manner such as the following: actual people read standardized passages to other actual people on the other end of a phone line, who then rated what they perceived to be the quality of what they heard. The MOS was the calculated arithmetic mean of the values reported by the listeners.</p>
<p dir="ltr">MOS is still used today albeit in a slightly different way; for example, you could compare the effect of different CODECS on both MOS and on bandwidth. </p>
<p dir="ltr">Hope that's of use to someone. </p>
<p dir="ltr">- Larry <br>
</p>
<div class="gmail_quote">On Dec 22, 2015 5:25 AM, "Regis M" <<a href="mailto:regis.freeswitch.org@tornad.net">regis.freeswitch.org@tornad.net</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Is there any docs page in confluence that described the mos/cdr value... there's RTP value, but no explication.<div><br></div><div>Regards,</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-12-21 16:56 GMT+01:00 Sergey Safarov <span dir="ltr"><<a href="mailto:s.safarov@gmail.com" target="_blank">s.safarov@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">xml_cdr log contains channel RTP statistic.<br>
For b-leg statistic is need to enable cdr for b-leg</p>
<br><div class="gmail_quote"><div><div><div dir="ltr">On Mon, Dec 21, 2015, 18:33 Grant Bagdasarian <<a href="mailto:gb@cm.nl" target="_blank">gb@cm.nl</a>> wrote:<br></div></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>
<div lang="NL" link="#0563C1" vlink="#954F72">
<div>
<p class="MsoNormal"><span lang="EN-US">Hello,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Is it possible to show channel stats in freeswitch, like on asterisk (sip show channelstats)?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Or perhaps another way of measuring call quality?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Grant <u></u><u></u></span></p>
</div>
</div></div></div>
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