[Asterisk-Users] fax receive using TDM400P

[Rich Adamson]

If memory serves correctly, I believe the echo canceller is automatically
turned off when fax tones/negotiation occurs on a zap channel.

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> That's what I imagined. I read somewhere that echocancel kills faxes.. Also,
> I guess hardward cards with echo cancel modules are a nono :)? 
> 
> |-----Original Message-----
> |Anton Krall wrote:
> |
> |>Any modification made to zapata as far as echo and gains?
> |>  
> |>
> |
> |As a rule, don't let anything manipulate the audio at all... 
> |even echo cancellation.  That said, I have seen situations 
> |where gain had to be increased.
> |
> |>Should echocancel be on or off? 
> |>
> |
> |Off, most definitely off.  I can't imagine an echo cancellor 
> |being capable of knowing what is echo and what isn't echo in a 
> |fax call.
> |
> |Lee.