Kevin P. Fleming wrote: > 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. > That is certainly true. Many of the comments people make about codecs owe more to the phone than the codec. However, there are various types of impairment. Even a phone which doesn't sound nearly as good as it could in G.711 mode may still sound much better in wideband mode.
A typical $200 business desk phone costs more than a typical mini-Hi Fi set that has a lot more complex bits in it, and sounds fantastic by comparison. Basically business desk phones are a swindle. Steve _______________________________________________ -- 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
