[Asterisk-Users] Fun with Echo -- Follow up

[Matt]

I eliminated my echo almost instantly by purchasing an echo canceling
card :)  I had about 30 minutes into to get the card installed and
asterisk up and running.

On 6/20/06, Brian Swan <swannie at swannie.net> wrote:
> I figured I'd answer my own thread and document what it took to get
> rid of the echo at my location.  For those of you trying to get rid
> of echo, let me tell you, "what worked for that guy, probably won't
> work for you".  I think we've all heard that before, and it's true.
> Let me assure you that echo can be removed from your phone lines.  At
> 20 hours into my 40 hours spent purging echo from my system, I didn't
> believe that, but its true.  So, here's what it took to get it out of
> my system:
>
> 1. Download zaptel-trunk from SVN:  As of this writing (6/20/06)
> using the "trunk" code instead of the 1.2.6 code was a major
> contributor in getting my echo to go away.
>
> 2. Use fxotune in zaptel-trunk:  Find a silent-termination test
> number from the phone company and use FXOTune.  I couldn't get it to
> dial right in order to get silence on the line.  You can verify if
> it's working correctly by running it with an analog handset connected
> to your phone line.  Pickup the handset and then run the command.  In
> my case, fxotune would never clear the line, or dial the silent
> termination number I was giving it, not sure if this is a bug or
> not.  What I eventually had to do was pick up the phone, dial the
> silent-termination number manually, run "./fxotune -i -b 4 -e 4", and
> quickly hangup the phone.  This was the only way I got good results
> from the program.
>
> 3. Patience and lots of "vi zconfig.h": Try each echo canceler, with
> and without the "Aggressive" option.  What eventually worked for me
> was the MG2 with Aggressive cancelation.
>
> 4. Along with above, you need to also try each and every combination
> of echocancel=xx and echotraining=xx.  These setting do make a
> difference.  I went through every possible value of each setting with
> each echo canceler, and kept notes along the way.
>
> 5. TIME: As I said above, I probably have 40 hours into eliminating
> the echo, but it is genuinely gone.  Your echo problem can be solved,
> it will just take some time.
>
> Hope this helps someone!
>
> Thanks,
> Brian
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