Venu 3 - transfer call to paired BT headset

Hi all,

is there some chance / possibility to transfer ongoing call to paired BT headset?

If I answer call on the watch or make a call from watch, audio is comming from watch speaker, but in case of using BT headset during workout, is there a way to use paired headset for calling? if I hit the icon (back to phone) call is transfered back to phone, but audio output is phone speaker, not connected headset unfornunately, so I need to unlock phone manually and change call audio to connected BT headset. 

Any experiences, ideas? 

Thanks