What does it mean to check the network and find it in good order?<div><br></div><div>A few things to watch for:</div><div><br></div><div>- FDX/HDX mismatches (which shows up as collisions and runts)</div><div>- multicast/broadcast bursts</div>
<div>- queue drops on switches</div><div>- stp events</div><div><br></div><div>If you're handy with wireshark you can also set it to watch a port and look for problems in the RTP. Garbled voice is either packet loss, latency, or phone hardware. Wireshark will show you if it's one of the first two.</div>
<div><br></div><div>Sean<br><br><div class="gmail_quote">On Mon, Sep 13, 2010 at 10:54 PM, <a href="http://LES.NET">LES.NET</a> (1996) INC. <span dir="ltr"><<a href="mailto:sales@les.net">sales@les.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff" text="#000000">
One thing to do, is run MTR or something that does 10 pings per
second.<br>
Monitor the pings in real-time, and when the audio anomaly is
occurring, see what MTR says for ping times.<br>
Or better yet, an SNMP octet counter for that interface that is your
bottleneck (default gateway)<br>
<br>
My suspicion is that something is consuming your full bandwidth for
a short period of time.<br>
<br>
Pinging on 1 second intervals would not reveal this..<br>
<br>
Les<br>
<br>
On 13/09/2010 8:26 PM, Bergen, Mark wrote:
<blockquote type="cite">
<div>
<p class="MsoNormal">We have noticed on occasion the outbound
audio on our phone system is garbled. We have checked the
network and it seems to be in good order. It happens randomly
and usually only for a few seconds (just long enough to annoy
users). It has also happened when there was only a light load
on the network.</p>
<p class="MsoNormal">We configured one of the snom 320 handsets
to only use the G711u codec and no real change (outbound audio
was still garbled a couple of times briefly over a 1.5hr phone
call). Our system uses VoIP only inside our local network, we
have an MTS PRI for outbound calls.</p>
<p class="MsoNormal">Anyone have any ideas or pointers?</p>
<p class="MsoNormal">Thanks;</p>
<p class="MsoNormal">Mark</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b><span style="color:maroon" lang="EN-US">Mark Bergen</span></b><span style="font-size:9pt;color:rgb(31, 73, 125)" lang="EN-US"></span></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Sean Walberg <<a href="mailto:sean@ertw.com">sean@ertw.com</a>> <a href="http://ertw.com/">http://ertw.com/</a><br>
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