[Asterisk-Users] Echo cancellation

Tue May 27 05:02:02 MST 2003

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

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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.
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