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I don't know what technology it is specifically, but it's a brand name they used for actual high quality calls. Think, 128 kB/s MP3, rather than the standard cups-and-string quality.

It only seems to work on mobile.



I know the difference, used G722. On mobile its G722.2, a totally different codec, but with the same ~7KHz range.

But there were some companies that advertised a lower frequency range as "HD".




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