[Asterisk-Users] Echo cancellation

[Lars Boegild Thomsen]

Hi Klaus,

Yes - el-cheapo BRI means the cheapest ISDN BRI card I could find at the
local hardware pusher, absolutely no-name locally (Malaysia) manufactured
Hisax type 20 card from isdn4linux point of view and yes - chan_modem_i4l.
I primarily bought the card just to check out how Asterisk perform with such
a card and generally it's ok actually.  Just that annoying echo thingy.

I don't think the Snom Phones can adjust the rx/tx gain in any way.  I don't
question your knowledge, but just out of curiousity - can you explain why I
only see this problem when I receive a call on the Snom's - not when I
originate a call?  Any ideas?  Any settings that can be modified in
Asterisk?

Regards,

	Lars

> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com
> [mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Klaus-Peter
> Junghanns
> Sent: 27 May 2003 20:02
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] Echo cancellation
>
>
> hi Lars,
>
> does el-cheapo BRI mean chan_modem_i4l? the echo you hear
> is caused by todays very sensitive pstn phones. the mic picks
> up the sound from the speaker and sends it back to you.
> try to reduce the rx and tx volumes of your snoms (if that is
> possible), or add rx/tx gain support to chan_modem_i4l like
> i have for chan_capi.
>
> regards
> kapejod
>
> --
> Klaus-Peter Junghanns
>
> CEO,CTO
> Junghanns.NET GmbH
> Breite Strasse 13 - 12167 Berlin - Germany
> fon:	+49 30 79705392
> fax:	+49 30 79705391
> iaxtel:	1-700-157-8753
> email:	kpj at junghanns.net
> http://www.junghanns.net/asterisk
>
> Am Die, 2003-05-27 um 14.49 schrieb Lars Boegild Thomsen:
> > Hi Everybody,
> >
> > Got a weird problem here I think.  Got a setup with an asterisk (current
> > from cvs as of a few hours ago) in a box with an el-cheapo ISDN BRI card
> > connected to the PSTN network and two Snom phones internally
> (one Snom-100
> > and one Snom-200).  Dialing between the snom phones or dialing
> out to PSTN
> > from any of the snom phones works perfectly.
> >
> > But when I receive a call FROM the PSTN network to any of the
> Snom phones,
> > the user on the Snom phone is hearing a bad echo of himself.
> This echo is
> > however NOT heard on the PSTN side.  Any hints?
> >
> > Regards,
> >
> >     Lars...
> >
> > --
> > Lars Boegild Thomsen
> > Technical Director
> > JustIT Sdn. Bhd.
> > Cell Phone (MY): +60 (16) 323 1999
> > ICQ: 6478559
> > Yahoo Chat: lars_boegild_thomsen at yahoo.com
> > MSN Chat: lars_boegild_thomsen at hotmail.com
> > http://www.justit.ws
> >
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