[asterisk-users] SPA3k wired to PAP2 for echo testing

[Doug Crompton]

Yes I agree, the SPA3000 can be a bear with echo on the PSTN. I did find
that using older fimware helped some and that the levels - there are 4
settings - FXO/FXS in/out can be juggled to help. I also found out after
adding a Budgetone 200 that I had much less echo problem going through it
and the spa3000 FXO - vs. using the local analog phones on the spa3000 fxs
port to FXO port. So some of the answer might be to get rid of as much (or
all) local analog as you can. I plan to buy more hard sip phones and do
that here eventually. This is ultimately more flexible as each extension
has it's own number and they can dial each other as well as dial more then
one place simutaneously. The big problem is that SIP phones are generally
ugly and black and not styled for home use.

Doug

On Sun, 5 Nov 2006, James Harper wrote:

> In my seemingly endless search for the cause of echo on my SPA3000, I
> wired it up in the following configuration:
>
> Analogue Handset <--> (FXS)SPA3000(FXO) <--> PAP2
>
> And set the Line1 dialplan on the SPA3k to '(<:@gw0>S0)' which means
> that as soon as I pick up the handset I get linked straight through to
> the PAP2, which gives me dialtone.
>
> Even in this configuration, with my impedance settings set to the
> Australian standard of 220+820||120nf, and the PSTN and PAP2 echo
> cancellers enabled (or not, and all combinations of) I get local echo as
> soon as I pick up the handset (I hear my voice bounced back to me).
> Surely this shouldn't be??? There is no hybrid involved at all!
>
> If anyone on this list with a SPA3k (that doesn't have any local echo
> problems on the PSTN port) and an ATA with a FXS port, could they please
> try the above setup and post the results (including SPA3k hardware and
> firmware versions, and the ATA used)? I wonder if there is a problem
> with some versions of the SPA3k where there is some sort of inbalance on
> the PSTN port that causes echo right there rather than further down the
> line?
>
> Thanks
>
> James
>
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****************************
*  Doug Crompton	   *
*  Richboro, PA 18954	   *
*  215-431-6307		   *
*		  	   *
* doug at crompton.com        *
* http://www.crompton.com  *
****************************