Yes, right now we are only using span 1 on the quad span card with
plans to pull in another T1 PRI when we get this echo problem solved.
The echo is only experienced when the call terminates to traditional
analog circuits both local and long distance. Calls to cell phones,
and other known digital circuits do not exhibit the symptoms. I've
been sent a few articles off list which discussed the reasons why this
may occur, imperfect impedance where the digital circuit is switched to
the analog circuit.
In testing I've set echocancel=no made calls, and echocancel=yes and
made calls with no real audible difference. I haven't done a zap show
channel while on a call with echo, but I plan to this weekend. I was
informed that the number of taps would be shown. I used a stop watch
last night to try to get the delay, and it was about 1/2 to 1 second
delay and was continual so long as I was talking. It wasn't affected
by differing acoustical variations. I tested this using handset,
headset, and speakerphone. Disabling VPM and recompiling zaptel or
removing the VPM off the board completely is the only thing that has
any effect on the echo. Hopefully the zap show channel will provide to
me another data point to help me determine if the HW module is active.
More to come...
Stagg Shelton
www.oneringnetworks.com
Cory Andrews wrote:
Stagg - I know you get a full 128ms
tail of echo can on the Sangoma. I believe that on the TE411P, the
128ms tail is shared by all (4) spans, and as you add additional spans
up to maximum of 4, the echo can tail amount decreases accordingly. If
you are running 4 spans, you have 32ms of echo can tail on each span,
not the full 128ms.
Now that I'm reading back through
your post thread, it looks like you were only running 1 span on the
TE411P, so you should have been getting the full 128ms of echo can
tail. You may not find an improvement with the Sangoma. I have never
experience, nor heard of a 1-2 full second delay. Trial and error is
likely your course of action.
Cory J Andrews
++++++++++++
VOIPSupply.com
454 Sonwil Drive
Buffalo, NY 14225
++++++++++++++
voice - 716.630.1555 X22
email - [EMAIL PROTECTED]
AIM - B2CORY
-----
Original Message -----
Sent:
Friday, February 10, 2006 11:34 PM
Subject:
Re: [Asterisk-Users] TE411P Really Bad Echo
It was Digium's opinion that perhaps the card had a VPM. We got a
replacement TE411P, I implemented it tonight and still the exact same
echo problem. At this point I feel like I can rule out failed
hardware.
I contacted Digium support and now they are telling me it's something
with my carrier, and I should call them. I called Bellsouth, and they
ran a full stress test on the circuit taking me offline for about 30
minutes.
The end result is that the circuit test passed with no errors.
Bellsouth says it's not in their network, Digium says its not their
card, and I have a te411p with VPM disabled in the wct4xx kernel module
because something doesn't work the way it should. My customer is
wanting to know about sangoma cards with the echo cancellation, and at
this point I'm nervous to recommend any hardware. I'm going to look
into the sangoma that you suggested. Are there any other kinds of
products that I could look into either Passive or Active.
Thanks
Stagg Shelton
www.oneringnetworks.com
Matt wrote:
try sangoma carrier grade 104d hardware EC card. we're using it ourself.
Best Regards
Matt
----- Original Message -----
From: "Anthony Rodgers" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users@lists.digium.com>
Sent: Tuesday, February 07, 2006 12:57 PM
Subject: Re: [Asterisk-Users] TE411P Really Bad Echo
For what it's worth, we have been going through very similar issues
with a TE411P - with Digium support, we have basically gone as far as
we can with the HW EC, and are now using MG2 with much better results.
We have a Ditech EC box on order.....
Regards,
--
Anthony Rodgers
Business Systems Analyst
District of North Vancouver
Web: http://www.dnv.org
RSS Feed: http://www.dnv.org/rss.asp
On Feb 7, 2006, at 7:36 AM, Matthew Fredrickson wrote:
On Feb 5, 2006, at 9:36 PM, Stagg Shelton wrote:
I just implemented a system using a TE411P hardware echo cancellation
card. Per Digium, I setup zaptel.conf, and zapata.conf the same way
as
I always have. To my surprise calls out to the PSTN had a terrible
echo. 1 - 2 second delay, and quite clear. The echo was so bad that
I
had to remove the hardware echo cancellation module from the card.
We
are only using the 1st span of this card right now, and we have a
tdm400p with 4 fxs modules installed as well.
If anyone has experience with this card, can you tell me if I am
missing
something.
1 to 2 seconds?! That's ridiculously huge. I don't think you'll find
a echo canceler anywhere that can fix your echo problem. If it gets
better with the VPM disabled, then definitely contact Digium
tech-support about it.
Matthew Fredrickson
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