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
I'm in the US and had bad echo problems with the SPA3K and the latest firmware. I was under the impression that the echo was due to my long cable run to the CO ~15000'. Changing the impedance (900 ohms) would help for a while, but after a few days the echo came back. If I rebooted the SPA3K the echo would go away for a while, but always came back. Assuming a software problem, I back-revved to an earlier F/W version. This seemed to help, but was not a cure. It did not pass muster with my wife. BTW: I did not experience echo on SIP calls through my ITSP or locally w/in my network. I've seen some chatter about a Global option helping, but never tried it. I gave up and switched to a TDM11B. There was also some talk about having the earpiece volume up too high such that the phone's microphone picked up the sidetone and caused echo. I did have better results when the phone's volume was turned down, but I the SPA3k echo problem was never cured Bob... 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 > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
Stephen Davies
2006-Nov-05 13:18 UTC
[asterisk-users] SPA3k wired to PAP2 for echo testing
On 05/11/06, James Harper <james.harper@bendigoit.com.au> wrote:> 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!'course there is. The telephone interface on the one end and the line interface on the other are both 2 wire. Did you have a phone line connected to the "other side". Running into an unconnected FXO port is likely to make echo because of the unbalanced impedance. Steve
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 > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >"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@crompton.com * * http://www.crompton.com * ****************************
In case anyone cares, I fixed the problem in the end by RA-ing the unit and getting another one. Whatever was wrong with it meant that the echo training just never happened. With the replacement unit, without having adjusted any gains or anything, there is initial echo which trains down to nothing in a fairly short time. James> -----Original Message----- > From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users- > bounces@lists.digium.com] On Behalf Of James Harper > Sent: Sunday, 5 November 2006 15:37 > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: [asterisk-users] SPA3k wired to PAP2 for echo testing > > 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 echoas> 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 theyplease> 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 inbalanceon> the PSTN port that causes echo right there rather than further downthe> line? > > Thanks > > James > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users