asterisk users - Jul 2004 - SPA-2000, call for help testing echo issues...

In my hunt to track down my echo issues, I tried disabling all echo
cancellation, suppression, adaption, on my SPA-2000 (Advanced section of
the config, under Line 1/2). Then calling from one local extension to
another. (SPA-2000 Line1, to Line2 on the same device)

I was pretty shocked with the results, the echo was HORRIBLE! I even
tried 3 different analog phones. 

Now, once I turned the echo cancellation back on, I tried a few tests to
see if I could hear any echo. The test was saying: "test",
"check", and
hitting my desk with a single finger fairly hard. 

When I would say "test" and "check" I would try all sorts of
different
voice tones, volumes, etc... I found I could still hear echo when doing
this. When I hit the table with my finger (while still holding the phone
to my ear and not talking of course), you could _really_ notice the
echo. I could hear the "hit" perfectly clear coming back through the
phone. 

As well if you change the Input/Output gains under the Regional section,
cranking them both up to 5 or so, you could easily hear the echo, and
the SPA-2000's poor attempts to cancel it. 

I'm curious to know if anyone else using SPA-2000's have the same
issues. I wonder if when calls are made from SPA-2000's to PSTN numbers
through Asterisk, asterisk is just amplifying the SPA-2000's own echo
somehow. 

Any test results are welcome, I would be very interested if other people
are unable to replicate my results. 

-- 
Mike Benoit <ipso@snappymail.ca>

Mike Benoit wrote:
>I'm curious to know if anyone else using SPA-2000's have the same
>issues. I wonder if when calls are made from SPA-2000's to PSTN numbers
>through Asterisk, asterisk is just amplifying the SPA-2000's own echo
>somehow.
>  
>
I've noticed that my SPA-2000 has very bad echoing at the start of calls 
going over the X100P to/from the PSTN.  However, within 60 seconds, the 
echo will eventually completely eliminate itself.  The echo is only 
heard from the SPA end, the remote caller does not hear any echo.

Currently I only have two X100Ps and the SPA-2000, so there isn't much 
to test with, but those are my out-of-the-box results.  I have yet to 
tweak any settings to see if I can eliminate the echo problem altogether.

I do have both asterisk's echo cancellation and the SPA's echo 
cancellation enabled.

Best regards,
Trevor Peirce