Not reliably. The VAD might detect &quot;We&#39;re sorry, you have reached a number that is disconnected...&quot; and consider that an &quot;answer.&quot; You might possibly be able to use the spandsp tone detect stuff to listen for ringback and then act accordingly if you no longer hear ringback, but that&#39;s a scary scenario. You are better off figuring out why the ATA isn&#39;t working in the first place. <br>
<br>-MC<br><br><div class="gmail_quote">On Thu, May 17, 2012 at 6:23 AM, cristian re <span dir="ltr">&lt;<a href="mailto:cristian.re.work@gmail.com" target="_blank">cristian.re.work@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>The ATA has both &quot;call answer supervision&quot; and &quot;polarity reversal&quot; but they doesn&#39;t works worldwide but only with some carriers.</div><div>Is there a way to delegate this job to Freeswitch? using voice activity detection?</div>

<div><br></div><div>Cristian</div><div><br></div><div><br></div><div>&gt;Technically, answer detection is the job of the ATA. The problem is that it</div><div>&gt;is an inexact science. I would look in the GXW docs to see if they have a</div>

<div>&gt;section on &#39;answer supervision&#39;. It might also be in a section along with</div><div>&gt;&#39;disconnect supervision.&#39;</div><div>&gt;</div><div>&gt;-MC</div><div><br></div><div><br></div>
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