Try<br><br>In chan_zap.c change the following line:<br><br>#define READ_SIZE 160<br><br>to<br><br>#define READ_SIZE 16<br><br>In zapata.conf<br><br>jitterbuffers=40<br><br>This will also increase system load by a factor of 10.
<br><br><div><span class="gmail_quote">2006/1/15, Aryanto Rachmad <<a href="mailto:aryanto.rachmad@chello.at">aryanto.rachmad@chello.at</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><font face="Courier New" size="2">Hello everybody,</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">I am sorry to bring this up again if this
kind of echo issue has ever discussed.</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">Phone2 in below call path experiences quite
annoying echo:</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">Phone1 --> FXS (TDM400P) --> Asterisk
--> SIP GW --> PSTN --> Phone2</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">It is annoying as on phone2, we can hear
the whole words we say with the level of maybe 25% of the original sound. I can
reduce the echo to maximum with the following settings for my FXS port on
zapata.conf:</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">rxgain=-8.0<br>txgain=2.0<br>echocancel=256<br>echotraining=500</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">But it is still not entirely
eliminated as we still sometimes hear the last syllables, with the level
of maybe 5% of the original sound.</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">What I did was just playing around with the
values of those parameters, use ztmonitor to have the FXS rx/tx
signal visualised and use only my ears to check it. I think my ears are
fine :), as I do this because my friends complain about the echo they
hear.</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">Does anybody know a better method
to find the best value for those parameters?</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">There is no echo on phone2 when
I use softphone like this:</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">
<div><font face="Courier New" size="2">PC(X-Lite) --> Asterisk --> SIP GW
--> PSTN --> Phone2</font></div></font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">The following is the version of asterisk I
am using:</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">CLI> show version</font></div>
<div><font face="Courier New" size="2">Asterisk SVN-branch-1.2-r7999 built by root
@ atvie-asterisk on a i686 running Linux on 2006-01-13 06:15:02 UTC</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">And I set the echo canceller in zconfig.h
to ECHO_CAN_MG2.</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">Cheers,</font></div>
<div><font face="Courier New" size="2"></font> </div>
<div><font face="Courier New" size="2">Anto</font></div>
<div><font face="Courier New" size="2"></font> </div>
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</a><br><br><br></blockquote></div><br><br clear="all"><br>-- <br>Giovanni Miano