asterisk users - Feb 2006 - more cpu intensive echo cancellers ?

Hi,
I've had some decent luck with the mark3 echo canceller from the zaptel
driver, echos on about 20% of the calls, people I've called say I sound
great now, but our side hears echos.
I was wondering if there was any way to tweak the current software
cancelers into using more CPU (and hopefully doing a better job, close
to a hardware canceler), I only have 10 lines, and a single call takes
0.5% cpu, I would have no problem if it went up to 5-10% if they would
work better.
Or should I just give up now and buy the channel bank, tellabs hardware
echo canceler and a T1 pci card? (hope TDM400P cards have decent resale
value ;)

-- 
Thanks,
Gerard Saraber
Network Admin, Rarcoa, Inc.
(630) 654-2580 x11
gsaraber@rarcoa.com

Gerard,

I'll bet your side is working great for echo cancellation.  It sounds
like the equipment at the other end of the call might need some help.
You know the old rule if you and I are talking on the phone: If I hear
echo, you've got a problem; if you hear echo, I've got a problem.  If
only all echo problems were so easy to diagnose!  In any case, is it
possible that some of the echo you're hearing is being caused by poor
echo handling on the other end of the line?

Just a thought.

-MC

-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Gerard
Saraber
Sent: Wednesday, February 08, 2006 11:03 AM
To: Asterisk Users Mailing List
Subject: [Asterisk-Users] more cpu intensive echo cancellers ?

Hi,
I've had some decent luck with the mark3 echo canceller from the zaptel
driver, echos on about 20% of the calls, people I've called say I sound
great now, but our side hears echos.
I was wondering if there was any way to tweak the current software
cancelers into using more CPU (and hopefully doing a better job, close
to a hardware canceler), I only have 10 lines, and a single call takes
0.5% cpu, I would have no problem if it went up to 5-10% if they would
work better.
Or should I just give up now and buy the channel bank, tellabs hardware
echo canceler and a T1 pci card? (hope TDM400P cards have decent resale
value ;)

-- 
Thanks,
Gerard Saraber
Network Admin, Rarcoa, Inc.
(630) 654-2580 x11
gsaraber@rarcoa.com

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I appreciate the input, but after doing a little research on that card,
it looks like I'll still need the channel bank, I think with some
carefull ebaying, I should be able to do the hardware canceling for
about $1000 less then what i saw the 104d card for.
not to mention it seems total overkill, I've got a wimpy 10 pstn phone
lines, a quad T1 card seems a little excessive to me. If there was a
single T1 with the G.168 echo canceler card for say $800, I'd be all
over that (still researching).

I've got all this extra cpu power, and nothing to use it on ;)
in the mean time, I'll put the 104d card on the list of possibilities,

Thanks,
Gerard Saraber
gsaraber@rarcoa.com



On Wed, 2006-02-08 at 17:26 -0800, Canuck15 wrote:
> Gerard,
> 
> Just get yourself a Sangoma card with hardware echo can and be done with
it.
> It is worth every penny just for the headaches it will save you.  It's
a
> better solution for most situations compared to a channel bank.  Cheaper,
> simpler and works just as good IMHO.
> 
> -----Original Message-----
> From: Gerard Saraber [mailto:gsaraber@rarcoa.com] 
> Sent: Wednesday, February 08, 2006 12:20 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: RE: [Asterisk-Users] more cpu intensive echo cancellers ?
> 
> Thanks for the quick reply :)
> It happens when we call a lot of different people, and obviously
doesn't
> happen with our old analog phone system, so even if its caused by someone
> else, *we* still have to fix it.
> we're kind of weighing our options, I'm hoping to take care of this
with
> some fancy software, but if not we'll be going the hardware canceller
route.
> 
> Thanks,
> Gerard Saraber
> gsaraber@rarcoa.com
> 
> On Wed, 2006-02-08 at 11:45 -0800, Michael Collins wrote:
> > Gerard,
> > 
> > I'll bet your side is working great for echo cancellation.  It
sounds
> > like the equipment at the other end of the call might need some help.
> > You know the old rule if you and I are talking on the phone: If I hear
> > echo, you've got a problem; if you hear echo, I've got a
problem.  If
> > only all echo problems were so easy to diagnose!  In any case, is it 
> > possible that some of the echo you're hearing is being caused by
poor
> > echo handling on the other end of the line?
> > 
> > Just a thought.
> > 
> > -MC
> > 
> > -----Original Message-----
> > From: asterisk-users-bounces@lists.digium.com
> > [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Gerard 
> > Saraber
> > Sent: Wednesday, February 08, 2006 11:03 AM
> > To: Asterisk Users Mailing List
> > Subject: [Asterisk-Users] more cpu intensive echo cancellers ?
> > 
> > Hi,
> > I've had some decent luck with the mark3 echo canceller from the 
> > zaptel driver, echos on about 20% of the calls, people I've called
say
> > I sound great now, but our side hears echos.
> > I was wondering if there was any way to tweak the current software 
> > cancelers into using more CPU (and hopefully doing a better job, close
> > to a hardware canceler), I only have 10 lines, and a single call takes
> > 0.5% cpu, I would have no problem if it went up to 5-10% if they would
> > work better.
> > Or should I just give up now and buy the channel bank, tellabs 
> > hardware echo canceler and a T1 pci card? (hope TDM400P cards have 
> > decent resale value ;)
> > 
> --
> Regards,
> Gerard Saraber
> Network Admin, Rarcoa, Inc.
> (630) 654-2580 x11
> gsaraber@rarcoa.com
> 
> 
> 
-- 
Regards,
Gerard Saraber
Network Admin, Rarcoa, Inc.
(630) 654-2580 x11
gsaraber@rarcoa.com

On Feb 8, 2006, at 1:03 PM, Gerard Saraber wrote:
> Hi,
> I've had some decent luck with the mark3 echo canceller from the zaptel
> driver, echos on about 20% of the calls, people I've called say I sound
> great now, but our side hears echos.
> I was wondering if there was any way to tweak the current software
> cancelers into using more CPU (and hopefully doing a better job, close
> to a hardware canceler), I only have 10 lines, and a single call takes
> 0.5% cpu, I would have no problem if it went up to 5-10% if they would
> work better.
> Or should I just give up now and buy the channel bank, tellabs hardware
> echo canceler and a T1 pci card? (hope TDM400P cards have decent resale
> value ;)
>
Yeah there is, upgrade to trunk and use the new echo canceller there 
(MG2).  It's supposed to rock, at least from what I've heard.  All the 
MEC cancellers are _OLD_.  At least switch to 1.2 and the KB1 echo 
canceler before giving up.

---
Matthew Fredrickson