I've noticed a difference in behavior between my old Desire and my wife's Desire Z when it comes to answer incoming calls while using BT headset.

On the old Desire/Froyo the audio gets directed to the answering unit; if I answer by pressing the BT headset answer button the voice audio comes through the headset, and if I answer on the phone unit answer button the call will be placed in the handset. But on the Desire Z/Gingerbread the audio will always stream through the BT headset regardless of on which unit I pressed the answer button. Annoying new "feature"...

I don't know if this is a Froyo/Gingerbread issue or if it's related to HTC Sense. Is it possible to get the old behavior on Desire Z?