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We've had the same issue. For calls that go between a SIP connection
(desktop phones) and Zaptel connections, there was a lot of problems
with half duplex. We switched<br>
from the Digium card to the Sangoma card and the problem went away.<br>
<br>
Doug Lytle wrote:
<blockquote cite="mid:4921A978.40303@drdos.info" type="cite">
<pre wrap="">Ken Williams wrote:
</pre>
<blockquote type="cite">
<pre wrap="">We’ve had an issue since we went live nearly two years ago on Asterisk
where people complain about not being able to talk while someone else
is talking. I had assumed for a very long time this was because of the
phones we went live with (Grandstream GXP-2000’s) and for the longest
time I
</pre>
</blockquote>
<pre wrap=""><!---->
Sound like your echo canceller is set to aggressive. Make it like a
walky-talky.
From the archives, January 2006:
On Friday 20 January 2006 15:36, Ronald Hartmann wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">Anyone know if it is possible to control how aggressively the
"Aggressive" mode behaves.
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
<pre wrap=""><!---->
No.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">I have a situation where Normal echo cancellation is not quite enough,
however when I turn on aggressive mode
We are attacking it to hard and I am unhappy with the walkie talkie
behaviour of the Aggressive mode.
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
<pre wrap=""><!---->
The agressive canceller is agressive because it is designed to turn your voice
channel into a half-duplex (walkie-talkie) communications channel. You can't
have a "half half duplex" situation. :-)
Have you tried recent SVN trunk with the MG2 echo canceller? I have found
that to be the absolute best to date.
-A.
Doug
</pre>
</blockquote>
<br>
<br>
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<font face="Arial"><b>Singer Wang</b><br>
<i>System and Database Engineer</i><br>
The Pythian Group<br>
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