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

[Bob Chiodini]

I forgot about the levels.  One thing that really helps is lowering the
"to PSTN" gain.  Unfortunately, you may find that to reduce echo to a
tolerable level you will need to reduce the gain so low that the called
party may have a hard time hearing you.  I think I dropped the gain
values by 4 dB.

Bob...

On Sun, 2006-11-05 at 21:55 -0500, Doug Crompton wrote:
> 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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> 
> 
> "Those that sacrifice essential liberty to obtain a little temporary safety
>  deserve neither liberty nor safety."  -- Ben Franklin (1759)
> 
> ****************************
> *  Doug Crompton	   *
> *  Richboro, PA 18954	   *
> *  215-431-6307		   *
> *		  	   *
> * doug at crompton.com        *
> * http://www.crompton.com  *
> ****************************
> 
> 
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