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

[C F]

On Thu, 10 Mar 2005 12:29:32 -0000, Brett, Gary
<gary.brett at cetelem.co.uk> wrote:
> 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?)

MMX is a feature that is bundled since the early days of PentiumII
(around 1997), it has never been removed, and is still with every
pentium cpu from intel.
To enable MMX in zaptel, before you compile zaptel, uncomment the line
that says:
/* #define CONFIG_ZAPTEL_MMX */
and change it to:
#define CONFIG_ZAPTEL_MMX


 
> 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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