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<div class="moz-cite-prefix">On 28/10/2013 4:12 PM, Mark Wiater
wrote:<br>
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<blockquote cite="mid:526EC522.7020809@greybeam.com" type="cite">
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<div class="moz-cite-prefix">On 10/28/2013 3:59 PM, Ron Wheeler
said:<br>
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<blockquote cite="mid:526EC23F.9000005@artifact-software.com"
type="cite">
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<div class="moz-cite-prefix">I am reaching the same level of
frustration.<br>
I have tried to find the source of the problems. <br>
We have IAX2 to our VoIP provider and SIP phones attached to
the Asterisk - No analogue.<br>
</div>
</blockquote>
I don't have any problems with IAX, but I hear some do.<br>
</blockquote>
I have now switched to SIP and will check the quality in the
morning.<br>
<blockquote cite="mid:526EC522.7020809@greybeam.com" type="cite"> <br>
<blockquote cite="mid:526EC23F.9000005@artifact-software.com"
type="cite">
<div class="moz-cite-prefix"> We have a very lightly loaded 60
Mbs cable link to the Internet that tests pretty close to that
most of the time.<br>
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</blockquote>
Bandwidth is less important than the overall quality of the
internet link, latency and jitter. Either way, there is no QoS on
the internet, all bets are off.<br>
<br>
The codec can matter too. What are you using?<br>
</blockquote>
G711<br>
<blockquote cite="mid:526EC522.7020809@greybeam.com" type="cite"> <br>
<blockquote cite="mid:526EC23F.9000005@artifact-software.com"
type="cite">
<div class="moz-cite-prefix"> <br>
I have not found any good tools to track down the causes of
poor voice quality.<br>
In my case, I have good incoming quality and terrible quality
going out.<br>
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</blockquote>
Oh, is your cable connection assymetric? Upload smaller than
download? If so, that correlates to terrible audio, right?<br>
</blockquote>
Just ran a test 50 Mbps download 10Mbps upload. Should be enough I
hope.<br>
<blockquote cite="mid:526EC522.7020809@greybeam.com" type="cite"> <br>
<blockquote cite="mid:526EC23F.9000005@artifact-software.com"
type="cite">
<div class="moz-cite-prefix"> That is, I can hear people
perfectly well but they complain that my voice drops out and
is garbled regardless of who places the call.<br>
As a result, I use Skype for all of my calls and if someone
calls me, I call them back on Skype if they have any problems.<br>
I don't understand why Skype works so well and Asterisk works
so poorly on the same environment.<br>
<br>
Googling "Asterisk poor audio quality" return several hundred
thousand references <br>
</div>
</blockquote>
I'd not shoot asterisk yet. I'd focus on the internet connection
and it's components (cable modem) first.<br>
<br>
</blockquote>
Good idea. I am sure that you are right but what to test and how are
not clear.<br>
<blockquote cite="mid:526EC522.7020809@greybeam.com" type="cite"> I
use asterisk all over the place. Mostly connected to PRI's and
Carrier provided SIP trunks, with internet SIP trunks as backup. I
get complaints on the Internet based SIP trunks sometimes, never
on other other two.<br>
<br>
I'd ask most of these questions of the OP too. Overall telephony
design matters.<br>
<br>
<br>
<br>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Ron Wheeler
President
Artifact Software Inc
email: <a class="moz-txt-link-abbreviated" href="mailto:rwheeler@artifact-software.com">rwheeler@artifact-software.com</a>
skype: ronaldmwheeler
phone: 866-970-2435, ext 102</pre>
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