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]  
http://www.techdatapros.com   
 
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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

[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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> > Asterisk-Users mailing list
> > To UNSUBSCRIBE or update options visit:
> >http://lists.digium.com/mailman/listinfo/asterisk-users
> >   
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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

[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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> > > Asterisk-Users mailing list
> > > To UNSUBSCRIBE or update options visit:
> > >http://lists.digium.com/mailman/listinfo/asterisk-users
> > >   
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> 
> 
> 
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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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