Steve Hayes wrote:
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> I've been round and round on this one with the SPA3102. The basic problem is
> a stupid design. Using VOIP internally between the FXS and FXO ports is
> unnecessary and the resulting delay makes echoes a problem.
>
> There is loads of advice on-line about tweaking gains, etc. but I never
> found that this helped significantly. In the end, I just tried the three
> echo cancellation/suppression settings on the PSTN tab to find the least
> objectionable combination:
>
> Echo canc enable needs to be on.
>
> Turning Echo canc adapt enable on works great most of the time but it fails
> horribly when both ends speak at once. Then there are really loud and
> disconcerting bursts of echo. Keep this one off.
>
> Then there is a tradeoff with Echo supp enable. If it's off, the echo is
> annoying. If it's on, you won't hear the other end if you both speak at
> once. On balance, I've resorted to having it on and get relatively few
> complaints.
>
> The SPA3102 is a great device except for two big flaws: far too many
> settings and awful echo problems. They should have consulted someone who
> knew something about telephony when they were designing it.
>[/color]

Thanks this sounds very similar to the problems I've been having. I
haven't been analytic about it but this all sounds very convincing.

I think you are right about the 3102, it is ok as a toy but it isn't
really good enough for normal users.

I was thinking of buying siemans SP450 IP but some people are reporting
problems with them so I thought I'd wait a bit in the hope that the
market matures. I don't want to spend another £100 on a product that
isn't quite there.

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> Steve
>[/color]