How to enable HD Voice (AMR-WB) in Padfone 2

[Guest rabins]

Dear all,

i'd like to know how to enable HD voice in padfone 2? tried every known setting and came failed.

in other brands, it required some secret codes to open special menu to enable it.

I know based on spec it support HD Voice (AMR-WB codec)

HD Voice also known as AMR-WB codec basically gives you crystal clear voice quality when making calls between supported handsets.

reference

http://en.wikipedia.org/wiki/Wideband_audio

http://www.gsacom.com/hdvoice/

[Guest narutofma]

that Codec Asus ROM do NOT have.