[asterisk-users] The High Performance Echo Canceller (HPEC)

[Wireless]

----- Original Message ----- 
From: "Nic Bellamy" <nicb-lists at vadacom.co.nz>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Thursday, February 15, 2007 8:53 PM
Subject: Re: [asterisk-users] The High Performance Echo Canceller (HPEC)


> Wireless wrote:
> > Does anyone know if the HPEC will work on a Sangoma A200 / 2 port FXO
card?
> > (I'm assuming so as it still uses Zapel)  I've 2 PSTN lines one of which
I
> > cannot get rid of the echo, I've tried a 2GHz machine as apposed to my
> > normal P3 650MHz and this made no difference. Would the 650Mhz be enough
to
> > run HPEC on one line (I assume only needing one licence)
> >
> It should work, providing all the Wanpipe stuff is ready to work with
> Zaptel 1.2.13.
>
> As far as performance, you should be able to get one, maybe two channels
> of 1024 tap cancellation on the P3, but I'd advise careful testing,
> perhaps even using oprofile for a while to keep an eye on what's using
what.
>
> You also have to watch out extra carefully due to the following: HPEC
> works in "sparse" mode, meaning it can cover 1024 taps, but just cancels
> echo in the parts where there is echo - hence CPU usage will likely
> change quite a bit with different echo paths - ie. a simple single
> reflection path will use less CPU than a complicated path with more than
> one reflection.
>
> Cheers,
>     Nic.
>
> -- 
> Nic Bellamy,
> Head Of Engineering, Vadacom Ltd - http://www.vadacom.co.nz/
>

Thanks Nic, I have bought a couple of HPEC channel licences from Digium and
been trying to get them working, all seems fine until I get to 9 and 10 of
this doc ftp://ftp.digium.com/pub/telephony/hpec/README - at which point
Asterisk is not running and I've issued a: "wanrouter start" command and all
looks good.

9 says type
[root at asterisk ~]# modprobe zaptel

which returns nothing... when I run 10
[root at asterisk ~]# ./zaphpec_enable
I get - No valid licenses for HPEC found.

If anyone can shed I bit of light on how to register my licence I'd be very
greatful, I've checked in /var/lib/digium/licenses and there is a licence
there.

Thanks

Harvey