[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:scook at kinex.net] 
> 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
> > msampson at yourccsteam.com
> > 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 - kerryg at techdatapros.com 
> > > http://www.techdatapros.com
> > >  
> > > 
> > > 
> ____________________________________________________________________
> > > 
> > > _______________________________________________
> > > --Bandwidth and Colocation provided by Easynews.com --
> > > 
> > > Asterisk-Users mailing list
> > > To UNSUBSCRIBE or update options visit:
> > >    http://lists.digium.com/mailman/listinfo/asterisk-users
> > >   
> > _______________________________________________
> > --Bandwidth and Colocation provided by Easynews.com --
> > 
> > Asterisk-Users mailing list
> > To UNSUBSCRIBE or update options visit:
> >    http://lists.digium.com/mailman/listinfo/asterisk-users
> 
> 
>