[Asterisk-Users] Echo calibration with ztmonitor and a test line from a telco

[Dan Littlejohn]

On 8/15/05, Ken Dresdell <kdresdell at globetrotter.net> wrote:
> Hello everyone,
> 
> Does anyone have experience with echo calibration for TDM card with
> rxgain and txgain (Zapata.conf) and ztmonitor (CVS Head)?
> 
> I have found very few information about it and what I have found makes
> me confused. I have a phone number provided by my TelCo(1004 hz at 0db)
> and from what I saw, I am supposed to calibrate my rxgain to get a 14800
> value with ztmonitor .
> 
> Here is the information I found:
> 
> 
> http://lists.digium.com/pipermail/asterisk-users/2004-November/071301.ht
> ml
> 
> 
> Does anyone have successfully reduced echo with this procedure?
> 
> My main problem is that when I get 14800 with ztmonitor, I have now a
> rxgain=14 and it seem to be too high for asterisk and I cannot dial out
> anymore.
> 
> Any suggestions?
> 
> 
> Thanks in advance for your pointers
> 
> Regards
> 
> Ken
> 
> 
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I have been doing a bit of this too lately.  This was also useful.

http://www.asteriskdocs.org/modules/tinycontent/content/docbook/current/docs-html/x1695.html

Dan