[Asterisk-Dev] IAX to zaptel echo

[pgrace at fierymoon.com]

I'm not too smart about these phone voodoos, but all I know is that I have
echo when using SIP to an FXO on a local 100mbit lan...  Something else
causing it in my case, maybe?

Pete



> Out of curiosity, isn't echo a function of delay?  It sounds like Claude
> may be running a this on a small development LAN which should have low
> latency.  Does anyone know if Asterisk introduces enough latency to cause
> echo?
>
> John
>
>
>
> -----Original Message-----
> From: asterisk-dev at lists.digium.com
> Sent: 8/20/2003 6:00 PM
> To: asterisk-dev at lists.digium.com
> Subject: RE: [Asterisk-Dev] IAX to zaptel echo
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I think the local echo is a fact of life for now -- if you
> compile in MARK2 and AGGRESSIVE_SUPRESSOR, the echo will
> usually equalize after 10 seconds of sent audio (or
> thereabouts depending on the speed of your system).  It's
> incredibly annoying, but I know for a fact that many of us
> experience it..  Someday we'll find a way to make it no
> more!
>
> Vanquish the evil demon that is echo!  Spencer, where are
> youuu? :)
>
> Pete
>
>
> - -----Original Message-----
> From: asterisk-dev-admin at lists.digium.com
> [mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of
> Claude Klimos
> Sent: Wednesday, August 20, 2003 2:17 PM
> To: asterisk-dev at lists.digium.com
> Subject: [Asterisk-Dev] IAX to zaptel echo
>
>
> Hi all,
>
> I am experiencing a problem with the quality of the voice
> communication between an IAX based softphone (WinIAX) and
> an outside line through a FXO port or even with a regular
> analog phone connected to a FXS port. The party using the
> IAX softphone hears his own echo a plit of a second after
> speaking. The party on the analog end does not experience
> any echo. I tried to modify the KFLAG parameter in the
> Makefile of zaptel to change the algorithm without results.
> I also tried to modify the value of the echocancel paramter
> in zapata.conf (tried 32,64,yes/128,256) without success.
> Note the parameter echocancelwhenbridged is set to yes.
>
> On the other hand, when I establish a communication between
> two IAX softphones, I hear no echo. This leads me to
> suspect the cards I am using. I have one X100P and one
> TDM400P card with 2 modules enabled.
>
> I would like to know if anyone encoutered this problem and
> how to minimize/eliminate the echo, if possible. Also, we
> will eventually be using a PRI with a T100P or a T400P,
> would the echo problem still be present?
>
> Regards,
>
> Claude Klimos
>
>
>
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