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
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