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Marcelo pela documentação o cancelador oslec pode ocasionar isso, tenta
mudar no system.conf para echocanceller=mg2<br>
<p>Make sure <strong>echotraining</strong> is disabled when using
Oslec – this is not supported and if enabled will cause the channel to
be silent (i.e. no audio will pass through).</p>
<p>4/ The settings above have been shown to reliably cancel echo in 95%
of cases. If you can still hear echo you may have one of the rare cases
where your echo is longer than 16ms. To configure Oslec with a 32ms
tail:</p>
<pre> echocancel=256
echocancelwhenbridged=no
;echotraining=400</pre>
<a class="moz-txt-link-freetext" href="http://www.rowetel.com/blog/?page_id=454">http://www.rowetel.com/blog/?page_id=454</a><br>
<br>
Allan Ananian<br>
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