[Asterisk-Users] echo paid support

[Brian M. Arlinghaus]

James,

After three months of echo, I finally got mine to go away.

I am using a Dell Optiplex GX280 with a P4 3.2GHz processor and 512MB RAM 
and Asterisk version stable 1.07.
Here's what I came up with after reading many of the posts and much trial 
and error.

1. Make sure that ther is no GUI loaded on the asterisk box.

2. Recompile Zaptel with MMX enabled (I think this applies to Intel 
Processors only, but someone may correct me if I'm wrong.)

To enable MMX in zaptel, before you compile zaptel, uncomment the line in 
/usr/src/zaptel/zconfig.h file that says:
/* #define CONFIG_ZAPTEL_MMX */
and change it to:
#define CONFIG_ZAPTEL_MMX

3. Recompile Zaptel with the "Aggressive Suppressor" enabled.  I have never 
read anything about this, but saw it while I was enabling the MMX support. 
>From reading zconfig.h, there are different versions of the echo canceller, 
but the comments say that the "aggressive suppressor" works with "MARK2" 
which is what was enabled by default in stable 1.07.

To enable the MARK2 AGGRESSIVE SUPPRESSOR in zaptel, before you compile 
zaptel, uncomment the line in /usr/src/zaptel/zconfig.h file that says:
/* #define AGGRESSIVE_SUPPRESSOR */
and change it to:
#define AGGRESSIVE_SUPPRESSOR

4. Recompile Zaptel with the instructions "reordered."  I don't know what 
this does, but it was recommended in these posts for fixing echo.

To "reorder" the instructions in zaptel, before you compile zaptel, add the 
following in /usr/src/zaptel/Makefile underneath the comment in the Makefile 
talking about all the config settings being in zconfig.h.  From the looks of 
it, it might only effect Pentium 4s???

CFLAGS+=-march=pentium4

5. Make sure the Zaptel card is not sharing an IRQ with othe hardware.  In 
my case, this involved moving my T100P to another slot and disabling all USB 
ports.  (I login remotely to administer the asterisk box since the GX280 
doesn't have a PS/2 keyboard port.)

6. Make sure that you have a sufficient processor and sufficient RAM.  I 
didn't make any additions to my configuration, but I did remove one 256MB 
RAM chip that seemed to be bad leaving 256MB.

Hope this helps.  Again, most of this is not from me, but others here with 
much more knowledge.

Brian Arlinghaus

----- Original Message ----- 
From: "James Taylor" <jltaylor at metrotel.net>
To: <asterisk-users at lists.digium.com>
Sent: Thursday, March 17, 2005 10:40 AM
Subject: [Asterisk-Users] echo paid support


> I've got echo problems.
> *** I'm looking for paid support. ***
> I'll accept free support, but don't mind paying if someone really knows 
> what they are doing.
>
>
> I've read the wiki, etc.
> Played with the settings in zapata.conf
> Using V400P
>
> PSTN->_T1->_ASTERISK->_BROADVOICE->_PSTN    ECHO ON CALLED PHONE
> PSTN->_T1->_ASTERISK->_T1->_PSTN            NO ECHO
> VOIP->_ASTERISK->_T1->_PSTN                 ECHO ON VOIP PHONE G711
>
> I have another trunk group and different T1's that go to a MAX TNT first:
> PSTN->_T1->_MAX_TNT->_VOIP->_ASTERISK->_VOIP_PHONE      ECHO ON VOIP PHONE
> g711
>
> PSTN->_T1->_MAX_TNT->_VOIP_G711->_ASTERISK_IAX_GSM->_ASTERISK_IAX_GSM->_VOIP_PHONE_g711 
> NO ECHO
> -- 
> James Taylor
> MetroTel
> 3505 Summerihll Road
> Suite 11
> Texarkana, Texas  75503
> 903-793-1956
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