Yes, there was an interesting discussion on the freetel-codec2 mailing list: https://sourceforge.net/p/freetel/mailman/message/37229056/ . On Wed, Apr 7, 2021 at 5:44 PM Guillermo Ruiz Camauer <grcamauer@gmail.com> wrote:

This looks like an interesting development in voice codecs: https://m.slashdot.org/story/383876

3 kbps for decent voice quality.

Guillermo

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