[Asterisk-Users] echo cancel from telco

[Imran Ahmed]

> here is a little explanation:
>
> End user (You) ---------> Your Telco ----------> Carrier 1 ----------->
> Carrier 2 ------------ Carrier 3 -----------> Carrier 4(PTT)
> --------------- > Far End User
>
> So basically, the Echo cancelling work backwards usually cancellation
> for you would be done by Carrier 4, 3, 2, 1, or your Telco in that order
> and echo for the Far End User would be done by Your Telco, Carrier 1, 2,
> 3, or 4 in that order.
>
> Why in that order?
>

AFAIK, the order is exactly the opposite, and if the user is
experiencing echo on the sip phone, its most likely that the other end
is the source of echo, which should be cancelled by the telco because
its is nearer to the source of echo than the sip phone gateway.