[Asterisk-Dev] Echo cancellation

[Kevin P. Fleming]

Aaron Daniel wrote:

> This question is regarding both possible user based solutions and I was 
> curious about the developers and how the code for the echo cancellers 
> were written.  Guess I didn't mention the second part.  Basically, does 
> the echo canceller cancel in both directions.

Generally speaking there is only one direction of echo cancellation 
needed: towards the 4-wire (digital) party. Any echo heard by the 2-wire 
party is normally acoustic echo, which we don't try to alleviate.