BFG-
There is a hack for this and that process is spelled out in a lengthy thread on
http://www.pdaphonehome.com/forums/showthread.php?t=57066
But be sure to read the entire thread and associated links. The problem with this and many hacks is these are, of course, unsupported and often come with hidden issues that get created in the process, that, you will be left to discover. So, I give you this with the ubiquitous caveat emptor!
I also discovered a blog from Microsoft some time back that discusses the specific reason why MS Voice command software specifically does not allow you to operate the Voice command from the blue tooth headset. The link to that may be in that thread somewhere but you'll have to find it because I don't recall it. Here is the theme of what was discusses in that Blog from the MS Voice Command software engr:
Blue tooth uses only an 8 bit audio transfer file process and in order for Voice Command to recognize the audio words it relies on 16 bit audio resolution. VC developers found that the 8 bit audio of BT was just too coarse for the VC to work properly and therefore don't allow this to function. It was a choice between compromise of poor recognition and BT featureset. They chose not to allow BT because it would generate errors too often
OK, that makes lots of sense, yet the hackers have discovered a way for this to work. I suppose that having a perfect environment, background noise free and using the finest quality BT headset would offer better recognition but as I stated earlier, this and other hacks are often given with some gotchas you will be left to discover.
This also begs the question about using BT for other audio relays. While I enjoy listening to podcasts in monaural thin BT quality, what about listening to mp3 music via BT in those new stereo head phones? Seems that music is more a function of high quality sound than just understanding the voice. Why would I want to listen to mp3 music at 8 bit 5Khz sound? I guess until a new BT standard goes into effect, making the 1.2 version we have in out phones today obsolete, we are stuck with this limitation and compromise.
One hack, kinda, I saw on that forum you may find convenient and I just added it here is the Voice mail hands free hack-
Verizon and sprint like you to tap in your Passcode in order to check your messages- The hack is to have the pass code entered into the dial up for you so when you call it by pushing 1 and holding it down until it dials, it calls: *86ppxxxx#
This generates a pause twice and adds the passcode xxxx after it answers and you go straight to your messages. I know that when driving and I called VM it was always an annoying nuisance to have to pick up the phone and enter it. Now I just have to say call voice mail with the VC button and it goes to messages. or in a noisy environment, push and hold 1 on the keypad.
Have fun!