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<p>Hi,</p>
<p><br>
</p>
<p>It depends on your definition of pipes not too overloaded. And
I'm presuming from mention of pipes that you mean network induced
call quality problems.<br>
</p>
<p><br>
</p>
<p>Usually bufferbloat. Routers with too much memory cause a lot
of latency at the point of a fast to slow transition in the
network.</p>
<p><br>
</p>
<p><br>
</p>
<p>And this can be caused by anything from a crappy DSL router on
upstream, and somebody emails a large attachment during a call.
Or it can be something like a unsupported 100meg optic on the
customer side of a juniper edge router on a 10gig core.
Customer does a download, latency goes nuts and all the phone
calls sound naff.</p>
<p><br>
</p>
<p>Tools to test.</p>
<p>fast.com and press the `Show more info` button. Forget the
bandwidth figures, and look at the difference between the loaded
and unloaded latency. If a big difference, you have a problem.</p>
<p><br>
</p>
<p><br>
</p>
<p><a class="moz-txt-link-freetext" href="http://www.dslreports.com/speedtest">http://www.dslreports.com/speedtest</a> This will give a bufferbloat
score. Then look at the results, and scroll down a bit and it
will show you upload and download latency figures for idle,
downloading and uploading. (This is one of the most amazing
tools, and I'd love a way to pay them some money each month to
support the service. They were struggling a bit at some stage.)<br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<p>Tim<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 13/06/2021 19:11, Mike Hammett
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1920878232.3381.1623607886331.JavaMail.mhammett@Thunderfuck2">
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<div style="font-family: arial,helvetica,sans-serif; font-size:
10pt; color: #000000">I've heard a variety of complaints and
concerns over the years about call quality. How are these
quality issues introduced? As long as pipes and equipment aren't
overloaded, where is a quality issue to come from?
<div><br>
</div>
<div><br>
</div>
<div>Obviously, the closer you are to the handsets, the less
opportunity there is for issues. What else is there to take
into account?<br>
<br>
<div><span name="x"></span><br>
<br>
-----<br>
Mike Hammett<br>
Intelligent Computing Solutions<br>
<a class="moz-txt-link-freetext" href="http://www.ics-il.com">http://www.ics-il.com</a><br>
<br>
<br>
<br>
Midwest Internet Exchange<br>
<a class="moz-txt-link-freetext" href="http://www.midwest-ix.com">http://www.midwest-ix.com</a><br>
<br>
<span name="x"></span><br>
</div>
<br>
</div>
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<br>
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