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OPUS Codec is HD+G722 is the best, it's an HD codec but not recommended for primary use, G729 and PCMU/PCMA are better for general use.
OPUS Codec is HD+
https://en.wikipedia.org/wiki/Opus_(audio_format)
http://opus-codec.org/comparison/
https://www.disruptivetelephony.com...atters-even-if-you-dont-care-about-audio.html
Lowest delay, Lowest Bit-rate, Totally open, Royalty-free, Highly versatile, Best Quality.
Good for narrow-band and full-band (HD Voice)