[asterisk-users] Full Duplex

Ken Williams ken at intermountainelectronics.com
Mon Nov 17 11:35:30 CST 2008

I thought the echo canceller you're referring to was for the zaptel
lines only.  Does this MG2 echo canceller also affect SIP-SIP and
IAX-IAX conversations?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Doug Lytle
Sent: Monday, November 17, 2008 10:27 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Full Duplex

Ken Williams wrote:
> We've had an issue since we went live nearly two years ago on Asterisk

> where people complain about not being able to talk while someone else 
> is talking. I had assumed for a very long time this was because of the

> phones we went live with (Grandstream GXP-2000's) and for the longest 
> time I

Sound like your echo canceller is set to aggressive. Make it like a 

 From the archives, January 2006:

On Friday 20 January 2006 15:36, Ronald Hartmann wrote:

> > Anyone know if it is possible to control how aggressively the
> > "Aggressive" mode behaves.


> > I have a situation where Normal echo cancellation is not quite
> > however when I turn on aggressive mode
> > We are attacking it to hard and I am unhappy with the walkie talkie
> > behaviour of the Aggressive mode.

The agressive canceller is agressive because it is designed to turn your
channel into a half-duplex (walkie-talkie) communications channel.  You
have a "half half duplex" situation.   :-) 

Have you tried recent SVN trunk with the MG2 echo canceller?  I have
that to be the absolute best to date.



Ben Franklin quote:

"Those who would give up Essential Liberty to purchase a little
Temporary Safety, deserve neither Liberty nor Safety."

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