Re: [asterisk-users] Echo Cancelation

[Kevin P. Fleming]

Robert Boardman wrote:

> I Have an ISDN 30 circuit passing through an asterisk box to a legacy 
> pbx, all is working well but I have had a problem that modems do not 
> work, I thought of turning off echo cancelation but I cann t seem to 
> find the ial switch do do it, could someone point me in the right 
> direction to enable /disbale ec on a zap channel per call?

Modems and FAXes already disable echo cancellation by themselves during
all setup (on the Asterisk console you'll see messages telling you the
canceller was disabled due to reception of a CED tone).

-- 
Kevin P. Fleming
Director of Software Technologies
Digium, Inc. - "The Genuine Asterisk Experience" (TM)

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[asterisk-users] Echo Cancelation

[Robert Boardman]

Hi All

I Have an ISDN 30 circuit passing through an asterisk box to a legacy 
pbx, all is working well but I have had a problem that modems do not 
work, I thought of turning off echo cancelation but I cann t seem to 
find the ial switch do do it, could someone point me in the right 
direction to enable /disbale ec on a zap channel per call?

Thanks
Robb

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Re: [asterisk-users] Echo Cancelation

[Jorge Mendoza]

Robor,

The echo arise at the far end, where the 4W/2W conversion take place,
not between the E1's. So, you should need an EC.

Regards

Jorge M.

Robor Oghene wrote:
> Thanks Steve, Its an Ericsson and Siemens Switch within same room.
>
> On Thu, Jun 26, 2008 at 5:23 PM, Steve Totaro
> <[EMAIL PROTECTED]
> > wrote:
>
> On Thu, Jun 26, 2008 at 12:17 PM, Robor Oghene
> <[EMAIL PROTECTED] > wrote:
> > Hello,
> >
> > If am connecting a  digium E1 card to a PSTN Switch in the same
> equipment
> > room would I need an echo canceller? wouldnt the Switch handle echo
> > cancellation for dial-in users?
> >
> > Responses would be appreciated.
> >
> > BR,
> >
> > Robor
>
> "Switch" is very generic and you give no real details.  But, I would
> say you should be fine based on the tiny bit of info provided.
>
> Thanks,
> Steve T
>
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Re: [asterisk-users] Echo Cancelation

[Robor Oghene]

Thanks Steve, Its an Ericsson and Siemens Switch within same room.

On Thu, Jun 26, 2008 at 5:23 PM, Steve Totaro <
[EMAIL PROTECTED]> wrote:

> On Thu, Jun 26, 2008 at 12:17 PM, Robor Oghene <[EMAIL PROTECTED]>
> wrote:
> > Hello,
> >
> > If am connecting a  digium E1 card to a PSTN Switch in the same equipment
> > room would I need an echo canceller? wouldnt the Switch handle echo
> > cancellation for dial-in users?
> >
> > Responses would be appreciated.
> >
> > BR,
> >
> > Robor
>
> "Switch" is very generic and you give no real details.  But, I would
> say you should be fine based on the tiny bit of info provided.
>
> Thanks,
> Steve T
>
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Re: [asterisk-users] Echo Cancelation

[Steve Totaro]

On Thu, Jun 26, 2008 at 12:17 PM, Robor Oghene <[EMAIL PROTECTED]> wrote:
> Hello,
>
> If am connecting a  digium E1 card to a PSTN Switch in the same equipment
> room would I need an echo canceller? wouldnt the Switch handle echo
> cancellation for dial-in users?
>
> Responses would be appreciated.
>
> BR,
>
> Robor

"Switch" is very generic and you give no real details.  But, I would
say you should be fine based on the tiny bit of info provided.

Thanks,
Steve T

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[asterisk-users] Echo Cancelation

[Robor Oghene]

Hello,

If am connecting a  digium E1 card to a PSTN Switch in the same equipment
room would I need an echo canceller? wouldnt the Switch handle echo
cancellation for dial-in users?

Responses would be appreciated.

BR,

Robor
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Re: [Asterisk-Users] Echo Cancelation on TE110P

[Matt Riddell [NZ]]

Kerry Garrison wrote:
> On a 55 station install onto a Cox PRI with a TE110P (Polycom 501 phones) a
> few users are complaiining about echo. According to the users, the echo
> seems to be phone number dependant. They claim that certain phone numbers
> have echo while others dont. Are there any tuning parametes like there is
> for a TDM400 card? 

You can either run the software echo can or use a hardware one.

You will have to enable it for all calls however.

The echo will be coming from the remote system.

-- 
Cheers,

Matt Riddell
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RE: [Asterisk-Users] Echo Cancelation on TE110P

[mustardman29]

There is a great little article on the unique challenges of Echo
Cancellation for a VoIP system written by The Sangoma CEO.  It points out
some things I was not aware of even after having read a lot of other
articles talking about Echo Cancellation in general.
http://www.linuxjournal.com/article/8424 

> -Original Message-
> From: Sean Cook [mailto:[EMAIL PROTECTED] 
> Sent: Friday, March 03, 2006 7:16 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Echo Cancelation on TE110P
> 
> In theory I would say I agree how ever in practice... I have 
> a PBX (Merlin Legend) that I am connected to via PRI (10 foot 
> pre-fab'ed
> cable) and I get intermittent echo on the voip side.   There 
> is nothing
> in between * and the PBX...
> 
> sean
> 
> On Fri, 2006-03-03 at 13:42 -0600, Michael Sampson wrote:
> > It is my understanding that when you hear echo the problem 
> is on the 
> > other end. So if a caller complains they hear echo that is 
> something 
> > you should be dealing with, but if you hear echo that is the phone 
> > companies fault. Now with a normal phone, the phone company 
> will only 
> > echo cancel long distance calls. For local calls the latency is not 
> > high enough to matter. But with VOIP the added latency creates echo 
> > even for local calls. I think the reason you hear it on 
> some numbers 
> > and not others is that the phone companies are doing echo cancel on 
> > some of those calls and not on others.
> > Michael Sampson
> > Information Systems Manager
> > Customer Contact Services
> > [EMAIL PROTECTED]
> > 952-936-4000
> > 
> > 
> > Kerry Garrison wrote: 
> > > On a 55 station install onto a Cox PRI with a TE110P (Polycom 501
> > > phones) a few users are complaiining about echo. According to the 
> > > users, the echo seems to be phone number dependant. They 
> claim that 
> > > certain phone numbers have echo while others dont. Are there any 
> > > tuning parametes like there is for a TDM400 card?
> > >  
> > > Kerry Garrison
> > > Director of Technical Services
> > > Tech Data Pros - Orange County's Mobile IT Service Provider
> > > (949) 502-7819 x200 - [EMAIL PROTECTED] 
> > > http://www.techdatapros.com
> > >  
> > > 
> > > 
> 
> > > 
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> 
> 
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Re: [Asterisk-Users] Echo Cancelation on TE110P

[Martin Joseph]

On Mar 3, 2006, at 11:42 AM, Michael Sampson wrote:

It is my understanding that when you hear echo the problem is on the other end. So if a caller complains they hear echo that is something you should be dealing with, but if you hear echo that is the phone companies fault. Now with a normal phone, the phone company will only echo cancel long distance calls. For local calls the latency is not high enough to matter. But with VOIP the added latency creates echo even for local calls. I think the reason you hear it on some numbers and not others is that the phone companies are doing echo cancel on  some of those calls and not on others.
More likely some handsets are just louder, causing feedback through the far end mic.

Sometimes you can fix this by reducing the gain on your mic.  ie if your mic is too amplified, it's too loud at the other end, and is picked up by the far end mic and sent back to you as an echo.


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Re: [Asterisk-Users] Echo Cancelation on TE110P

[Sean Cook]

In theory I would say I agree how ever in practice... I have a PBX
(Merlin Legend) that I am connected to via PRI (10 foot pre-fab'ed
cable) and I get intermittent echo on the voip side.   There is nothing
in between * and the PBX...

sean

On Fri, 2006-03-03 at 13:42 -0600, Michael Sampson wrote:
> It is my understanding that when you hear echo the problem is on the
> other end. So if a caller complains they hear echo that is something
> you should be dealing with, but if you hear echo that is the phone
> companies fault. Now with a normal phone, the phone company will only
> echo cancel long distance calls. For local calls the latency is not
> high enough to matter. But with VOIP the added latency creates echo
> even for local calls. I think the reason you hear it on some numbers
> and not others is that the phone companies are doing echo cancel on
> some of those calls and not on others.
> Michael Sampson
> Information Systems Manager
> Customer Contact Services
> [EMAIL PROTECTED]
> 952-936-4000
> 
> 
> Kerry Garrison wrote: 
> > On a 55 station install onto a Cox PRI with a TE110P (Polycom 501
> > phones) a few users are complaiining about echo. According to the
> > users, the echo seems to be phone number dependant. They claim that
> > certain phone numbers have echo while others dont. Are there any
> > tuning parametes like there is for a TDM400 card? 
> >  
> > Kerry Garrison
> > Director of Technical Services
> > Tech Data Pros - Orange County's Mobile IT Service Provider
> > (949) 502-7819 x200 - [EMAIL PROTECTED]
> > http://www.techdatapros.com 
> >  
> > 
> > 
> > 
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> >http://lists.digium.com/mailman/listinfo/asterisk-users
> >   
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Re: [Asterisk-Users] Echo Cancelation on TE110P

[Michael Sampson]

It is my understanding that when you hear echo the problem is on
the other end. So if a caller complains they hear echo that is
something you should be dealing with, but if you hear echo that is the
phone companies fault. Now with a normal phone, the phone company will
only echo cancel long distance calls. For local calls the latency is
not high enough to matter. But with VOIP the added latency creates echo
even for local calls. I think the reason you hear it on some numbers
and not others is that the phone companies are doing echo cancel on 
some of those calls and not on others.
Michael Sampson
Information Systems Manager
Customer Contact Services
[EMAIL PROTECTED]
952-936-4000


Kerry Garrison wrote:

  
  
  On
a 55 station install onto a Cox PRI with a TE110P (Polycom 501 phones)
a few users are complaiining about echo. According to the users, the
echo seems to be phone number dependant. They claim that certain phone
numbers have echo while others dont. Are there any tuning parametes
like there is for a TDM400 card? 
   
  Kerry Garrison
Director of Technical Services
  Tech Data Pros - Orange County's Mobile IT Service
Provider
  (949) 502-7819 x200 - [EMAIL PROTECTED]
  http://www.techdatapros.com
   
  

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RE: [Asterisk-Users] Echo Cancelation on TE110P

[Darren Wright]

only for the whole cardthe tx and rx gain affect all 24 channels.
 
-D
 



From: [EMAIL PROTECTED] on behalf of Kerry Garrison
Sent: Fri 3/3/2006 11:19 AM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: [Asterisk-Users] Echo Cancelation on TE110P


On a 55 station install onto a Cox PRI with a TE110P (Polycom 501 phones) a few 
users are complaiining about echo. According to the users, the echo seems to be 
phone number dependant. They claim that certain phone numbers have echo while 
others dont. Are there any tuning parametes like there is for a TDM400 card? 
 
Kerry Garrison
Director of Technical Services
Tech Data Pros - Orange County's Mobile IT Service Provider
(949) 502-7819 x200 - [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> 
http://www.techdatapros.com <http://www.techdatapros.com/>  
 
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[Asterisk-Users] Echo Cancelation on TE110P

[Kerry Garrison]

On a 55 station 
install onto a Cox PRI with a TE110P (Polycom 501 phones) a few users are 
complaiining about echo. According to the users, the echo seems to be phone 
number dependant. They claim that certain phone numbers have echo while others 
dont. Are there any tuning parametes like there is for a TDM400 card? 

 Kerry GarrisonDirector of 
Technical ServicesTech Data Pros - Orange County's Mobile IT Service 
Provider(949) 502-7819 x200 - [EMAIL PROTECTED]http://www.techdatapros.com 

 
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Re: [Asterisk-Users] echo cancelation on Digium T1 cards

[denon]

That's data or fax CNG, not dtmf. And yes, it's disabled for the duration 
of the fax or data session.

-d
At 11:36 PM 1/10/2005, you wrote:
Hello all,
I am getting console debug messages about "tone detected on channel XX, 
disabling echo cancelation on channel XX" when using echocancel=yes with a 
Digium T1 card.

does this mean that DTMF breaks the echo can?  Does Asterisk permanently 
disable the echo can or is it for that channel instance only?

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[Asterisk-Users] echo cancelation on Digium T1 cards

[Matthew Simpson]

Hello all,
I am getting console debug messages about "tone detected on channel XX, 
disabling echo cancelation on channel XX" when using echocancel=yes with a 
Digium T1 card.

does this mean that DTMF breaks the echo can?  Does Asterisk permanently 
disable the echo can or is it for that channel instance only?

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[Asterisk-Users] echo cancelation

[[EMAIL PROTECTED]]

i've browsed the the voip site... but cant find is there a way the asterisk server
to cut the ECHO, or it is only possible with hardware solution ?
I'm connecting 2 voip phones. 

tia
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Re: [Asterisk-Users] echo cancelation

[Lee Goodman]

Check the debug log to see if echo cancel is really kicking in.
Also, you have to have the echocancel=yes before the individual channel
statements
- Original Message -
From: "Linus Surguy" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 15, 2003 11:19 AM
Subject: [Asterisk-Users] echo cancelation


> HI all,
>
> Having a mental block today - can someone confirm which direction the echo
> cancelation applies to for the Zap PRI channels?
>
> ie. is it removing traces of the transmitted data to the PSTN from the
> received data,
>
> *or* is it removing traces of the data transmitted to Asterisk from the
data
> received back from Asterisk?
>
> Got a configuration that is based on a call made from the PSTN to a SIP
> user:
>
> PSTN -> Telco Switch -> PRI -> Asterisk -> SIP -> X-Lite
>
> PSTN caller hears no echo
> X-Lite user hears significant (1 second or so) echo
>
> If we setup a call so that the 'telco switch' runs an IVR process instead
of
> linking to the PSTN, keeping the call entirely in the digital domain so no
> signal reflection the X-Lite user does not hear echo.
>
> Echocancel=yes etc. is enabled in the zapata.conf
>
> Which party is at fault?
>
> Linus
>
>
>
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[Asterisk-Users] echo cancelation

[Linus Surguy]

HI all,

Having a mental block today - can someone confirm which direction the echo
cancelation applies to for the Zap PRI channels?

ie. is it removing traces of the transmitted data to the PSTN from the
received data,

*or* is it removing traces of the data transmitted to Asterisk from the data
received back from Asterisk?

Got a configuration that is based on a call made from the PSTN to a SIP
user:

PSTN -> Telco Switch -> PRI -> Asterisk -> SIP -> X-Lite

PSTN caller hears no echo
X-Lite user hears significant (1 second or so) echo

If we setup a call so that the 'telco switch' runs an IVR process instead of
linking to the PSTN, keeping the call entirely in the digital domain so no
signal reflection the X-Lite user does not hear echo.

Echocancel=yes etc. is enabled in the zapata.conf

Which party is at fault?

Linus



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