> My SPA-3000 has never crashed, but echo cancellation has always been a bit[color=blue]
> poor (particularly at the remote caller's end), and dependent on audio
> gain levels set in the poorly-documented, over-complex web GUI.[/color]

Martin,

Maybe you tried this already, and maybe you're already tired of trying stuff
with the SPA-3000 already, but you might want to try different line
impedance configurations in the SPA-configuration, this does have an effect
on the echo canceller.

Trying another analog phone also sometimes help, the local echo canceller
(which is the one that causes the echo at the remote site) sometimes can't
cope very well with specific (cheaper) phones, or a lot of phones parallel.

Christian