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