I've used Voicetronix FXO/FXS ports and noted pretty heavy echo on both short and long runs to other switches. We went through some steps to try to tune the echo out using some settings on the card, and it helped with some of the higher frequencies, but the problem still remains for many users. We decided, based on this and other problems, to pick up a Digium TDM board with 4 FXS ports and it virtually eliminated all our problems. The digium are short run (<20 feet) to our PBX.
The next step is probably going to be buying a 12 FXS / 8 FXO port TDM24XX card with hardware echo cancellation. The FXS will be all short run to our PBX and the FXO will be relatively long runs to the phone. So I'm very curious (and hopeful) that the problems will be much abated. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James Harper Sent: Monday, February 06, 2006 5:46 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: RE: [Asterisk-Users] BAD/GOOD Echo Cancel > > virtually all software echo cancelers cannot get double echo removed > completly. It can get the first one but not the second one. There are > instances where you get a 2nd echo, so ... Asterisk is no exception > from this afaik nothing software only based is. > > If you really want good echo cancelation a hardware solution is the way > to go. > Just an enquiring mind wanting to know, but how is a hardware solution different to a software solution? The echo cancellers in the Digium hardware presumably just use the same sort of algorithms as the software versions, so it is just that they are dedicated and perform better, that they are closer to the source of the echo, or some other thing that I've overlooked? Thanks james _______________________________________________ --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
