[Asterisk-Users] TE411P Really Bad Echo

[Eric "ManxPower" Wieling]

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.