3 button hands free & the HTC One

[harryv]

Hi all,
I'm not clear on wether the HTC One actually supports 3-button wired headsets or not?

I have tried many headsets, and besides the PTT (push to talk) button, neither of the volume buttons seem to function.

Headsets tried included standard iPhone 3 button hands free, Sennheiser hands frees, amongst others.

Can anyone confirm or deny whether the volume controls on any wired headsets work with the HTC One?

Cheers
Harry