[Asterisk-Users] how do i get rid of this blasted echo !!!

[Brett, Gary]

Sorry for the delay in replying to this post, my hardware platform is an HP
Compaq D530 SFF - 2.4gb /512mb /40gb. I have a TDM02b configuration (2xFXO).
You mention FCC and the mode for UK impedance, can you explain a little
further on this one as I am a little lost, I cant see any setting with "FCC"
anywhere (even in the config samples) so could you explain whereabouts I set
this ?

The other question I have is regarding the MMX stuff you talk about. My
processor is a P4 2.4ghz, excuse my lack of knowledge here but I thought MMX
was a feature bundled with processors of about 5 years ago?? Do I still need
to recompile with MMX support, and if so, some pointer on how to do this
would be appreciated (also, can I recompile the zaptel drivers and carry on
as normal, or will I need to reinstall asterisk again?)

Any help would be greatly appreciated

Regards
Gary



-----Original Message-----
From: Andrew Kohlsmith [mailto:akohlsmith-asterisk at benshaw.com] 
Sent: 03 March 2005 12:32
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] how do i get rid of this blasted echo !!!

On March 3, 2005 07:02 am, Brett, Gary wrote:
> I have 2 TDM400P's, 2 asterisk servers (running on powerful boxes with FC1
> and * v CVS 1.0.02), and 4 analogue PSTN lines from BT and whatever I do,
I
> cannot get rid of this damn local echo. Ive tried setting the
echoTraining,
> echoCancel (in phone.conf and Zapata.conf) , echocancelwhenbridged to
every
> possible combination , Ive even tried running the fxotune utility to no
> avail. Ive swapped cards, telephone lines, servers and also tried
different
> phones (budgetone, x-lite, 7940) but still it's the same.

You haven't told us what hardware (platform) you're on, nor have you told us

if your FXO ports are in whatever mode they need to be in for UK impedances 
(I think they default to FCC or North American).

For echo on my PRI I could not get rid of it until I recompiled the zaptel
and 
wct4xxp drivers with MMX support enabled and with the instructions reordered

and used for the pentium 4 processor (which I'm using, Xeon 2.6 to be
exact).

After that, the echo magically disappeared.  I haven't reverted back to my 
original (non-processor-optimized, non-MMX-enabled) drivers to see if it 
comes back, but that's all that's changed and it's in production so I am 
hesitant to screw around with it any more.  

-A.
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