Hands-free? Not exactly

Here’s an idea from Kay which is more of a product improvement than an idea, but worth throwing into the volcano anyway… Why is it that hands-free kits need you to press a button to accept and drop calls. We have voice activated dialing on phones, why can’t we have voice activated hands-free kits. To answer an incoming call all you would need to do is say accept or to ignore say decline. There is no need to press any buttons and outgoing calls could be made in the same way, for example all you would need to do is say “call idea volcano” and your call would be connected.