On 5 Jan 2011, at 13:07, Steve Underwood wrote:

> G.722.1 is a 7kHz bandwidth codec. G.722.1C is a stretched version offering 
> 14kHz bandwidth. These are most often found in Polycom phones, but they are 
> available elsewhere. The only widely supported HD codec is G.722. Pretty much 
> anything offering wideband voice supports G.722.

Except skype which only supports SiLK as the HD codec. I mention this because 
most people's experience with HD will be in a Skype-to-skype call,
although admittedly not in this group.


Tim Panton - Web/VoIP consultant and implementor

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