On Thursday 15 June 2006 10:22, Warren wrote: > I was just told that for my forthcoming system I will be getting a data > T-1 instead of a voice T-1. Given that all of the handsets will be voip > phones, no analog at all, do I need echo cancellation? I looked at the > voip-info wiki and it seems to me that the answer should be "no" but I > would like to confirm that.
All-digital setups do not *generate* echo since there is no hybrid circuit to reflect energy. However all-digital systems can still have echo if the far-side is a 2-wire system and the latency is sufficiently high. (Anything with a PCI bus can bring this latency up easily.) Also, if you have an ueber-cheap phone which acoustically couples the speaker in the handset with the mic you can introduce echo on your all-digital system that way. The same goes for cheap speakerphones and/or acoustically "hard" rooms. -A. _______________________________________________ --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
