Difference between HFP 1.6 and HFP 1.5?

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Can someone please help in getting the difference between HFP 1.6 and HFP 1.5 ? Any link or available document?

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JustSomeOne On BEST ANSWER

Have a look at the Wikipedia page on Bluetooth profiles:

https://en.wikipedia.org/wiki/Bluetooth_profile

Specifically under the HSP section:

Version 1.6 adds optional support for wide band speech with the mSBC codec, a 16 kHz monaural configuration of the SBC codec mandated by the A2DP profile.