EC2 - you are running under a VM.  Perhaps you are getting glitches due to timing issues that are more severe when the audio is being mixed as apposed to just passing the audio between endpoints?<br><br><div class="gmail_quote">
On Thu, Mar 25, 2010 at 2:48 PM, Chris Fowler <span dir="ltr">&lt;chris@fowler.cc&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">








<div lang="EN-US" link="blue" vlink="purple">

<div>

<p class="MsoNormal">Hi,</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">Here’s the problem I’m “hearing”:</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">Test Case #1</p>

<p class="MsoNormal">x1001 calls x1002</p>

<p class="MsoNormal">- Audio is rock solid</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">Test Case #2</p>

<p class="MsoNormal">x1001 calls x3001 (Conference Bridge)</p>

<p class="MsoNormal">x1002 calls x3001 (Conference Bridge)</p>

<p class="MsoNormal">- Audio is mostly perfect.  However, occasional “glitches”
in the audio can be heard</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">Notes:</p>

<p class="MsoNormal">- Bypass media is switched off.  FreeSWITCH routes
audio for both the bridged, and the conferenced call</p>

<p class="MsoNormal">- rtp<span style="color:black">-</span>autoflush<span style="color:black">-during-bridge is “true” on Sofia profile internal.xml</span></p>

<p class="MsoNormal"><span style="color:black">-
I enabled the debug trace for auto-flush in switch_rtp.c (line 1895) and see
occasional auto flush of rtp packets for *<b>both</b>* test cases.  The
glitches don’t coincide with the flushing.  In fact with flushing
you can’t hear when data gets flushed (2x20ms packets).</span></p>

<p class="MsoNormal"><span style="color:black"> </span></p>

<p class="MsoNormal">Environment</p>

<p class="MsoNormal">- CentOS 5.4</p>

<p class="MsoNormal">- Tested on AWS EC2 Small, Medium, Large instances.  On
Medium and Large CPU affinity for FreeSWITCH set to the 2<sup>nd</sup> core.</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">Questions:</p>

<p class="MsoNormal">- What’s different between bridging a call and a
conference call run through mod_conference in terms of audio processing?  </p>

<p class="MsoNormal">- Thoughts on how to debug this?</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">Thanks, Chris.</p>

</div>

</div>


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<br></blockquote></div><br><br clear="all"><br>-- <br>-Rupa<br>