Steve Underwood wrote: > You might think a standard phone plugged into an adaptor, like a > Magic-jack, would be limited to narrow band voice, as that is all the > phone was designed for. It turns out most phones only aggressively > filter at the low end of the band. They let a lot of energy above 4kHz > through, and they do generally sound better through a wideband codec.
I found it quite interesting the first time I used a Polycom IP650 (the first wideband capable hardphone to arrive at Digium) that the voice quality was much improved even using G.711! Presumably this is due to using higher quality speakers, mics and other audio bits required to provide wideband audio quality, but it would appear from this (exhaustive) sample set that in fact many phones (even from high end manufacturers) don't even provide the maximum audio quality achievable with G.711. -- Kevin P. Fleming Director of Software Technologies Digium, Inc. - "The Genuine Asterisk Experience" (TM) _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
