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

[C F]

---------- Forwarded message ----------
From: C F <shmaltz at gmail.com>
Date: Thu, 10 Mar 2005 11:43:06 -0500
Subject: Re: [Asterisk-Users] how do i get rid of this blasted echo !!!
To: Jon Bebeau <jbebeau at 1nettw.net>


On Thu, 10 Mar 2005 10:43:54 -0500, Jon Bebeau <jbebeau at 1nettw.net> wrote:
> Hi all,
>
> I'm still fighting echo on a T1-PRI too.  I see the suggestion about
> enabling MMX in zaptel/zconfig.h but I didn't understand the bit about
> reordering the instructions.  Can you elaborate?
In /usr/src/zaptel/Makefile add
CFLAGS+=-march=pentium4

underneath the comment in the Makefile talking about all the config settings
being in zconfig.h.


> Thanks,
>
> Jon
> ----- Original Message -----
> From: "C F" <shmaltz at gmail.com>
> To: "Asterisk Users Mailing List - Non-Commercial Discussion"
> <asterisk-users at lists.digium.com>
> Sent: Thursday, March 10, 2005 9:07 AM
> Subject: Re: [Asterisk-Users] how do i get rid of this blasted echo !!!
>
> > 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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