[opus] Are the ITU's stretched-to-wideband codecs being used?

[Steve Underwood]

Hi,

The ITU has been churning out a series of codecs which stretch older 
codecs to support wideband or super wideband and stereo. Does anyone 
know of these things being used in the real world? They push the idea of 
these things offering high compatibility, as the narrowband bitstream is 
embedded in the wideband stream. However, I'm skeptical this offers any 
real world advantage.

Regards,
Steve