[Asterisk-Users] Tiny Echo on PSTN via Zaptel

[Shaw Terwilliger]

On Thu, Sep 29, 2005 at 08:33:03AM -0400, Tony Nichols wrote:
> I have had problems between the sip/FXO lies and was able to "kill" the echo
> by trying different combinations of the echocancel line to 64 (I think it
> has settings in 32 bit increments)
> Just kept trying different ones till it went away. Here is my config:

I think I finally found the problem (but I'm not sure).  The rxgain on
my phone ports was set to -8.  When I turned them back up to 0.0 (to
boost the outgoing signal on the POTS lines when a call was going on),
the echo canceller seems to work pretty well.  I've been using ztmonitor
to verify this: previously the echo was 20-40% of the original signal.
Now it's hardly ever there.

I thought I had my gains set correctly, but it seems like louder is
better (except for distortingly loud) for the echo canceller.

-- 
Shaw Terwilliger <sterwill at sourcegear.com>
SourceGear LLC
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