Displaying 20 results from an estimated 10000 matches similar to: "Cisco's description of echo"
2006 Feb 08
3
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
2006 Jun 19
3
ECHO Tutorial
Is there anyone that could explain to me the phenomenon of Echo or at
least point me where I can learn more? Why is this affecting the VoIP
world so much and not the regular PSTN analog world? What does the
PSTN industry have that they can handle such high volume of calls and
there is "no" echo problem?
Thanks,
Daniel
2006 Jun 08
7
Fun with Echo
I've spent the last week or so troubleshooting echo problems at my
Wife's business, and I've been able to clear up about 99% of the
echo, but there is still a little residual echo that I can't seem to
"tweak out". The users describe it as "buzzing or crackling", but
what it sounds like to me is a slight echo, but just of one syllable
of the word.
2011 May 12
1
Disabling echo cancellation by software
Dear, I have Asterisk 1.6 with an E1 Digium card with echo
cancellation module. So I need to use just the echo cancellation by
hardware and disable the echo cancellation by software. I use DAHDI
for my telephony hardware.
If the lines involved with echo cancel are:
In /etc/dahdi/system.conf:
echocanceller=mg2,1-15,17-31
In /etc/asterisk/chan_dahdi.conf:
echocancel=yes
echocancelwhenbridged=no
2006 Feb 06
7
BAD/GOOD Echo Cancel
>
> hi,
>
> How good or bad is the EC in Asterisk?
>
> Can anyone prove that it works at all and what it's limitations are?
>
> I ask cause I have some problems with this myself which variate from
> call to call, and I see from others that Echo Cancel is a quite common
> topic.
>
> Jan
>
>
I have installed systems that had absolutely no echo
2005 Aug 18
2
Hardware echo cancellation
Anybody using hardware echo cancelers a PRI at a time ?
What did you use ? How much did they cost ? Where'd you get em.
Tell us about them !
Alan
2009 Aug 25
2
Echo
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body bgcolor="#ffffff" text="#000000">
I recently upgraded my Asterisk system to Dahdi and now I have an echo
<br>
problem.
<br>
<br>
I am running Asterisk 1.4.25 with Dahdi Complete 2.2.0, on a Digium
<br>
TE121B PCI express
2003 May 27
21
Echo cancellation
Hi Everybody,
Got a weird problem here I think. Got a setup with an asterisk (current
from cvs as of a few hours ago) in a box with an el-cheapo ISDN BRI card
connected to the PSTN network and two Snom phones internally (one Snom-100
and one Snom-200). Dialing between the snom phones or dialing out to PSTN
from any of the snom phones works perfectly.
But when I receive a call FROM the PSTN
2006 Jun 19
0
Re: Asterisk-Users Digest, Vol 23, Issue 135
There's an excellent tutorial on Cisco's web page at
http://www.cisco.com/en/US/tech/tk652/tk701/technologies_white_paper09186a00800d6b68.shtml
It will tell you just about everything you wanted to know about echo and
more :)
The short answer to your question, however, is that echo is comprised of
two components: volume and delay. Increase either one and the problem
gets worse. In the
2009 Aug 18
3
Zaptel -> DAHDI: now echo
Hello
I have upgraded our asterisk box from zaptel to dhadi two weeks ago...
Since, there has been quite a significant amount of echo when making a
call. Only for the local outgoing call, the person on the other side
doesn't hear any echo.
This is with a TE-110P ISDN PRI card ..
I've pretty much took the original zaptel configuration and used it
as-is with the dahdi one ; to no
2006 Mar 28
3
R: Echo cancellation
Ok, but is there a way to check if echo cancellation is active on a call in progress ?
Thanks
Giordano
-----Messaggio originale-----
Da: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] Per conto di Steve Davies
Inviato: marted? 28 marzo 2006 16.43
A: Asterisk Users Mailing List - Non-Commercial Discussion
Oggetto: Re: [Asterisk-Users] Echo cancellation
2004 Aug 19
3
Echo SIP-T100P-PRI
I'm experience echo on outgoing calls:
Snom 200 ----> Asterisk ----> T100P ----> PRI ----> called party
I am getting echo on the Snom 200 phone. The called party does not
hear the echo.
Since the PRI is digital, I don't really understand where the
echo is coming from.
I turned on echotraining, echocancellation=yes (128), and echowhenbridged
in zapata.conf, to no avail.
2005 Jan 29
3
Channel Bank Echo
We are a voip terminating company, we're using Channelbank with FXS
modules, Rhino, CAC, etc.. What we're wondering is, is how to would you
echo cancel a channelbank. Of course we're realizing that cancel'ing on
the T1 (on Ast) does no good (we think?) because the analog conversion
is at the channelbank. Suggestions? Lowering the gain helps but we're
looking for a real solution
2010 Dec 15
2
Echo Cancellation Problem - Invalid Argument?!?
Greetings folks-
I'm experiencing issues with a freshly installed box. When a call comes in via PRI (Sangoma AFT-A104), I see this in my logs:
[Dec 15 14:26:10] WARNING[23546] chan_dahdi.c: Unable to enable echo cancellation on channel 12 (Invalid argument)
[Dec 15 14:26:10] WARNING[23546] chan_dahdi.c: Unable to enable echo cancellation on channel 8 (Invalid argument)
[Dec 15 14:26:10]
2010 Sep 15
3
Echo on Sangoma A400 and background noise
I'm a long time user of Digium carts and stupid me i wanted to give Sangoma
a try.
We got Sangoma A400 with 6 FXO ports.
Asterisk version: 1.4.35
Zaptel version: 1.4.11
Wanpipe version: 3.5.11
we tried to use fxtune but looks like it wont work with Sangoma card, (
please correct me if i'm wrong)
Echo is really bad and also we have background noise on all lines.
We tried both mg2 and
2005 Oct 04
3
Echo Canceling
I have been battling echo since we installed a new system at one of
our clients. I am using a single span digium card. I believe this is
the first time someone has setup a PRI in this area (its way out in
the middle of nowhere). We get slight echo on all calls, and when
calling some numbers (long distance calls but still in the local
area), we get very loud echo. The person calling out can hear
2004 Sep 23
3
Help with strategy for echo cancellation.
I have just installed * (RH9, P4 3.0GHZ, 1G RAM) in a small office,
using three TDM400's with 4 FXO's each for incoming calls. Outgoing
calls are (for the moment) routed via VoicePulse. Phone sets are Cisco
7940G's using SIP. I'm getting intermittent echo on outgoing calls, and
my understanding, based on reviewing the wiki and several posts here, is
this:
>>>> The
2007 Jun 25
1
Echo Cancellation
Hi All, I have tried using echo cancellation, and I think it doesn't
work well, because of how I resample. I take the raw 44100 Hz on my
mac and just do a loop averaging every 5.5 samples to 1 sample to get
8018.18 Hz, and feed that to speex in 160 sample buffers. I realize
that this introduces some aliasing, and I may try the new speex
resampler, but I find it hard to believe that
2005 Sep 30
2
Echo Cancellation not working in Zapata.conf
I have echocancel=yes in zapata.conf but when I do a zap show channel 1,
I notice echo cancellation is turned off.
I followed the article that talks about the order in which the
statements need to be in zapata.conf to get echo canceling to work:
http://lists.digium.com/pipermail/asterisk-users/2005-June/110615.html
But it is still not working. Does anyone know how to get echo
2008 Sep 12
1
Echo Cancellation not working on WinCE
Hello Friends,
I am trying to use speex-1.2beta3 version for echo cancelling.
On my WinCE board I am using WaveIn/WaveOut functions to record and playback
audio.
I am receiving audio data on udp socket, then playing it on speaker using
WaveOutWrite function.
I registered callback to capture microphone data, then data chunk came from
socket ( which I played on speaker) and data captured from