Nick wrote:[color=blue]
> Steve Hayes wrote:
>[color=green]
>> 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.
>
>[color=green]
>> Steve
>>[/color][/color]
Just ordered a C475IP a snip at £80, I am 'upgrading' from a SPA3000