Thank you all for valuable input,
another question: when do I actually need the echo cancellation
(hardware / on board /on module ) ?
It depends on your environment. If there are still analog devices in addition to VoIP, I'd say
always, but Asterisk has a rudimentary echo canceller already on board. The Telcos use echo
cancellers themselves, but it cannot hurt to have a hardware canceller on your BRI card.
Nowadays I see more problems with reverberation in connection with cheap speakerphones or simple
mics and speakers on PCs, but that's a different story.
jh
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