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 > > > > > > > > > > ____________________________________________________________________ > > > > > > _______________________________________________ > > > --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 > > > _______________________________________________ --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
