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<DIV><FONT size=2 face=Verdana>Hi,</FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>The question is can you record the audio to
evaluate its quality? There is intrusive approach when you have a reference file
that you can test against the recorded audio, or non-intrusive approach, which
allows you evaluate voice quality of any call recording (no reference
needed). Both correspond to ITU-T standards: P.862 for intrusive and P.563 for
non-intrusive, or to Sevana AQuA (for intrusive) and Sevana NIQA (for
non-intrusive).</FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>The difference is that all ITU-T recommendations
related to voice quality measurement are quite expensive and involve annual
royalties, but they are recognized standards. Sevana products are not recognized
standards, but are used by many happy customers doing call quality assessment in
VoIP, PSTN and mobile networks.</FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>Welcome to our web site: <A
href="http://www.sevana.fi">http://www.sevana.fi</A> for further information and
customer references (many are Asterisk owners) or just contact us
directly.</FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>Best Regards,<BR>Sevana Oy</FONT></DIV>
<DIV><FONT size=2 face=Verdana>Finland</FONT></DIV>
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style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=dhaval.it01034@gmail.com
href="mailto:dhaval.it01034@gmail.com">DHAVAL INDRODIYA</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=asterisk-users@lists.digium.com
href="mailto:asterisk-users@lists.digium.com">Asterisk Users Mailing List -
Non-Commercial Discussion</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, February 04, 2011 12:53
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [asterisk-users] voice quality
measurement using dahdi_monitor</DIV>
<DIV><BR></DIV>hi group ,<BR><BR>i am working on dahdi_monitor for measuring
voice quality , so i want to know that on which data i can tell that this
PRI<BR>lines are working properly, is there any measurement on basis of that i
can make MOS. i am working from last 2-3 days <BR>but i only get idea about
making .raw file and making .wav file and visulal mode of RX and TX of PRI
line.<BR><BR>what i want is measurement of voice quality so that i can talk
with provider that i am getting % of voice quality.i am sure there is <BR>some
better way to solve or debug .raw file and taking a decision.<BR><BR><BR>let
me help please to solve and finding problem of voice
quality.<BR><BR><BR>regards<BR>Dhaval<BR>
<P>
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