[asterisk-users] Echo...

[Ken Williams]

Well here's what I did to finally get some sort of ground.  I was going
to move the card to a different slot, when I opened up the box I saw
there was a power split between the connector & the card to feed a fan
in the system.  I removed this split so it was straight in from the
power supply.  I then moved the card to another slot, and between the
two, echo cancellation actually started to work.

I played with the settings a bit, then got your e-mail and noticed I was
in fact using the wrong fxotune.  I used the new version, switched back
to MG2 from MARK2 and removed aggressive suppressor.  Now I am
practically echo free.

Thanks for the tips, any ideas why either the power split or the card
slot would keep add echo, or at least make it so my echo settings
weren't taking?  As soon as I modified the hardware the echo was vastly
improved, then the minor modifications mentioned above wrapped it up. 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Matthew
Fredrickson
Sent: Friday, January 12, 2007 9:14 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Echo...


On Jan 11, 2007, at 8:53 PM, Ken Williams wrote:

> I tried to be thorough, but of course left fxotune out.  I did try 
> fxotune, it resulted in something like 9,0,0,0,0,0,0,0 for each fxo 
> (I'm not at work now, I can post the results if it'll help).

Make sure you run fxotune from 1.4 (or trunk).  From your output values,
it looks like you just tried the 1.2 version of it.  The 1.4 version
sets the remaining values.  It got a pretty considerable rework between
1.2 and 1.4 and runs a lot better.

So here's your order of operations:
1.) Run 1.4 (or trunk) version of fxotune on your lines.
2.) Make sure your init scripts have fxotune -s in it (to set the values
when you reboot).
3.) Use the MG2 echo canceler from 1.4.
4.) And if all else fails, try the aggressive suppressor option.  I
recommend that as the last and final option since it's a really non
elegant way of fixing it.

Matthew Fredrickson


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