Hello Joe,
I asked the same question. It is probably a
combination of things, hardware issues like PCI bus latency, plus an issue of
interest. I suspect the big companies have managed to cover this, but also
because they charge a lot for their equipment.
Being open source, yes you could write your own, and their
probably are bounties out there right now (of which I would add to). I am
going with a hardware tellabs can via a channel bank. A real
solution? I asked this a while ago on the list, and my opinion is it
probably will not happen within the next 3-6 months. After that I would
not know either, but the popularity of asterisk has grown so much that possibly
we would get lucky with some good algo's that cover more diverse
situations.
I find that digium has a great product, and the echo is a
big issue. Many people can usually tweak it out, some cannot (especially
those with issues on lines or long loops). Even if you are on a long loop
that does not mean the $1000 card will be perfect. I spent more than that
on a bank and t1 card, but there is also a lot of flexibility.
If you are running 12 ports I would certainly consider a
channel bank or one of those digium cards (which is actually less than your
three tdm400's I beleive), but keep in mind that using a hardware EC like a
tellabs requires either a shelf, or some good project
skills.
The aggressive works well, though I cannot say it is 100%
perfect.
Maybe a pci-express digium card would help :) Just an
idea.
Greg
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Joe
PukepailSent: Friday, December 02, 2005 6:28 PMTo:
Asterisk Users Mailing List - Non-Commercial DiscussionSubject: Re:
[Asterisk-Users] echo canceling algorithm
I have been wondering about echo canceling, it seems to be one of the major
problems people have with asterisk. I've gotten it to acceptable levels
(using mark2 aggressive), but everything I've read indicates that the echo
canceling software isn't very effective.
My question would be, what do we need to get an effective echo canceler (in
asterisk software)? Is it patent issues? No experience (I know I
don't know anything about how to write a echo can algorithm) or just getting the
right people interested in writing one ($)?
With digium offering hardware echo can, I can only conclude that echo can
can't be done effectively in software? If it is a matter of money perhaps
a bunch of users can offer bounties for someone (or some company) to write an
good echo canceler?
With the amount of money that a hardware echo canceling card costs (+$1000
per T1/E1) if half of this were spent on a fund for software echo cancel it
would seem we could do it (if it is even possible using todays technology??).
I don't mean this as critical of the developers who have done so much, just
an honest question what we (as users) can do to help improve the product.
On 12/2/05, Patrick
Fortin [EMAIL PROTECTED]
wrote:
HiJust
wandering what solution worked to eliminate echo on your setup.I am
trying every solutions I can find on the wiki and none is working
perfectly.We have asterisk 1.2.03 x digium TDM400P30
Snom320 + 5 Snom360For now the best setup I have is using Mark2 Echo
cancel.ThanksPatrick___
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