[Asterisk-Users] BAD/GOOD Echo Cancel

[James Harper]

> 
> virtually all software echo cancelers cannot get double echo removed
> completly.  It can get the first one but not the second one.  There
are
> instances where you get a 2nd echo, so ...  Asterisk is no exception
> from this afaik nothing software only based is.
> 
> If you really want good echo cancelation a hardware solution is the
way
> to go.
> 

Just an enquiring mind wanting to know, but how is a hardware solution
different to a software solution? The echo cancellers in the Digium
hardware presumably just use the same sort of algorithms as the software
versions, so it is just that they are dedicated and perform better, that
they are closer to the source of the echo, or some other thing that I've
overlooked?

Thanks

james