[Asterisk-Users] Echo Problem with T411P

[Idris AVCI]

Hi Steve,

Thank you for your answers. First of all span 3 is not a satellite link
and  no echo occurs when I connect this line to another pbx with HW EC
feature. I use TE411P with hardware EC and asterisk version 1.2.5. Do I
have to do something to enable EC for this card ?

Idris

-----Original Message-----
From: Steve Davies [mailto:davies147 at gmail.com] 
Sent: Monday, June 19, 2006 1:28 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Echo Problem with T411P

> >> More than 128ms?
> >
> > 128 = 128 taps = 16ms of 8KHz audio, so no, not more that 128ms, but
> > definitely more than 16ms.
> No, 128ms = 1024 taps
>
> Like what sangoma offers.
>
> Ding, Ding, Ding, Ding!

Okay, to be complete in my answers:

No I do not get more than 128ms delay caused by European routing (I
only threw that in as an example anyway), but asterisk's software
cancellers only cancel 16ms, any more than that seems fairly buggy,
and eats CPU.

On the other hand, if that is a satellite link on span 3, you could
easily get latency in excess of 1 second, which it should be the
provider's responsibility to cancel, not the end user's IMHO.

I also agree that the sangoma EC is excellent :) Do we know what E1/T1
hardware is in use here, and whether hardware EC is available?

Steve
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