[Asterisk-Users] echo cancellation: the never-ending quest for truth

[Bryan Vyhmeister]

I am having good luck with MARK2 in aggressive mode here as well. I have 
also found that setting rxgain=-2.0 and txgain=-6.0 works very well for 
SBC lines in two different installations thus far. Should the same 
settings consistently work about the same? I guess I was under the 
impression that hardware differences and whatever would cause each 
installation to be a good bit different. When I was originally trying to 
figure this out I was going to try the other echo cancellation 
algorithms but the fact that MARK2 had an aggressive mode made me stop 
there.

Bryan

Darren Nickerson wrote:
> "Bruce Komito" <brucek at bagel.com> spake thusly:
> 
>> Asterisk apparently has five echo cancellation algorithms: STEVE, STEVE2,
>> MARK, MARK2 and MARK3.  The current default appears to be MARK2.
>>
>> My question is, has anyone had any experience with any of the others
>> (other than MARK2), and is there some conventional wisdom as to when to
>> use one over another?
> 
> 
> Bruce,
> 
> I asked Mark that question at Astricon, since it seems to me that this 
> section of the code offers lots of options with little guidance, and I 
> haven't seen this matter receive any in-depth treatment on the list 
> lately either (I guess most people simply accept the out-of-the-box 
> default, and those who do have echo problems for any reason (like us) 
> dig a little deeper).
> 
> He said that MARK2 is the recommended one, and that some people have 
> found the aggressive option help.
> 
> FWIW, we run MARK2 in aggressive mode here.
> 
> -Darren
> 
> -- 
> Darren Nickerson
> Senior Sales & Support Engineer
> iFax Solutions, Inc. www.ifax.com
> darren.nickerson at ifax.com
> +1.215.438.4638 x8106
> +1.215.243.8335 (fax)
> 
> 
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