For the record, I've done a couple of Asterisk installs, and HATED echo -- or feebly attempting to get Asterisk's flakey software algorithms to do anything about it. Finally got sick 'n tired, and threw money at it -- got the Sangoma quad-span T1 card.
And echo freaking VANISHED. (Note that, with EC disabled, I do get echo about 1/6 of the places I call. So it's really, truly working, and not just luck.) They use the G.168-2002 algorithm; I, personally, had never heard of it before, but I bounced it off a friend of mine (he's a hardware architect for a major VoIP switch manufacturer -- they sell to places like Time Warner), and he was of the opinion that G.168 is the _ONLY_ algorithm. So, from now on, I'm doing DSP-based EC. And Sangoma just came out with some analog cards with EC -- haven't tried 'em out yet, but I'm looking forward to doing so. -Ken Krystian Filiks wrote: > Did you test the echo delay? > will 64ms be suffitient? > > You can easily test the delay by recording the transmit and receive > path to a sound file and using some sound editing software see how big > the delay is. > That is how I did it when I worked for a Telco in Switzerland on theis > TDM switch they had a big Echo problem on their SS7 links and PRI's > > Krystian > > Doug Lytle wrote: > >> [EMAIL PROTECTED] wrote: >> >>> On Mon, 6 Feb 2006, trixter aka Bret McDanel wrote: >>> >>>> Again, I know Sangoma is a sore subject with some on this list, but >>>> the >>>> echo cancelation stuff I heard while presented by a Sangoma >>>> employee was >>>> not Sangoma specific, although it did include some research into >>>> different hardware/software based cancelers. >>> >>> >> >> I put a Tellabs 64ms echo canceller into my facility this weekend and >> am praying that it removes are echo problem. If it does, I plan on >> making it a standard on my Asterisk installs that have a channel bank >> or T1. >> >> Doug >> >> _______________________________________________ >> --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
