Why won't Jawbone headset invoke Voice Search/Dialing?

I have an **Aliph Jawbone** (original) which worked fine with Sony Ericsson dumb-phones (K750, K810) but on my **HTC Desire S** (Gingerbread, 2.3.3) I can't figure out how to use it for voice dialing. The phone can find the headset, pair with it and connect to it. If I double tap on the Jawbone's call button, it triggers the phone's last number redial and calls a contact; but a single press (which should invoke voice dialing on the phone somehow), has no effect. With dumb-phones, I would just press the headset button, hear a low-pitched beep, then a higher pitched beep a second later when the phone responds, prompting me to speak. Then the phone would receive the noise I make, and go and do its thing. With this Android phone, I don't hear that 2nd beep, so apparently the phone isn't responding to the Jawbone. Am I going about this in the wrong way? Should I be using the Car Panel's Voice Dialer instead? *** Update *** I've tried the **Voice Dialer**, and it *almost* does what I need, but to use it I need the phone out and visible, with the screen on, and I have to tap on the screen to trigger the dialer. I didn't have to do this with phones from five years ago. **Note** I am looking for a *hands-free* solution, so any advice that involves unlocking the phone, staring at it, and stabbing at the screen simply isn't an answer. It would also be illegal under English driving law. I *am* considering buying Cyberon's Voice Speed Dial , because that seems to work the way I'd like it to (without needing a data connection to an online speech-to-text service); but I want to check that I'm not missing some daft configuration setting.