Since your EC only needs to support a tail long enough to handle the
PSTN part of the call, I suspect even fairly short tails are fine.
Steve Underwood wrote:
I don't know about the Tellabs cancellers in particular, but I think any
echo canceller built in the 80s will be a fairly poor performer. Many
improvements in EC occurred in the early 90s, in response to the
problems of earlier cancellers. Also, most older cancellers only cancel
fairly short echo tails, as the compute needed for longer cancellation
was expensive.
On the other hand, they may be adequate for your needs, and are cheap.
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