[asterisk-users] TDM400 native bridge echo

[Mervyn Yeo]

Hi Shaun,

I'm new at this but I do have some queries on your setup. You have two
interfaces and three channels? And there's only signalling specified
for channel 3? If I am not wrong, the channel inherits all the
settings from before it.

Mervyn

On 11/21/06, Shaun Kruger <shaun.kruger at gmail.com> wrote:
> I have a TDM400 with an FXS and FXO interface.  I have adjusted the TX
> and RX gain for both the FXS and FXO channels so that everything is
> balanced.
>
> I hear myself very loudly with no lag.  I also get alot of background
> noise when the bridge is formed between the FXS and FXO channels.  I
> have read the following articles:
> http://www.voip-info.org/wiki/view/Asterisk+echo+cancellation
> http://www.voip-info.org/wiki/view/Causes+of+Echo
>
> I have read these multiple times.  My system is now useable, but it's
> definitely worse than when I plug the phone directly into the wall.
>
> My loadzone is 'us'.
> I have the following in my zapata.conf
> usecallerid=yes
> transfer=yes
>
> channel => 1
> context=outbound
> mailbox=00
> channel => 2
>
> echocancel=yes
> echocancelwhenbridged=yes
> context=inbound
> signalling=fxs_ks
> faxdetect=incoming
> busydetect=yes
> busycount=5
> rxgain=5.2
> txgain=-0.5
> channel => 3
>
> Is there anything I'm missing?  I assume there is because it's not
> working as well as I had hoped.  Any suggestions of what to try next,
> what to look for, or what additional documentation I should be reading
> would be much appreciated.
>
> Shaun
>
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