Aryanto Rachmad wrote:
Hello everybody,
I am sorry to bring this up again if this kind of echo issue has ever discussed.
Phone2 in below call path experiences quite annoying echo:
Phone1 --> FXS (TDM400P) --> Asterisk --> SIP GW --> PSTN --> Phone2
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:
rxgain=-8.0
txgain=2.0
echocancel=256
echotraining=500
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.
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.
Does anybody know a better method to find the best value for those parameters?
There is no echo on phone2 when I use softphone like this:
PC(X-Lite) --> Asterisk --> SIP GW --> PSTN --> Phone2
Are you sure that X-Lite is not running an echo can?
I'd say it's more likely that the SIP GW is causing the echo and that
when you use X-Lite, it's echo cans are removing the echo.
Try to make a call from Phone->FXS->Asterisk->X-Lite
I suspect there will be no echo.
BTW what is the SIP Gateway?
--
Cheers,
Matt Riddell
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