What Bluetooth stack supports HFP on Windows XP?

I am looking for a Bluetooth stack for Windows XP that supports HFP. Here is what I have found so far:

• Wildcomm - HFP not supported or no one has be able to enable it.
• Microsoft - support for HFP in their embedded platforms.
• Toshiba - supports HFP, but their Bluetooth stack seems to be only for their products.

Has anyone had any luck using HFP with any B开发者_StackOverflowluetooth stack on Windows XP? In addition to the audio connection, I also need the hands-free signals to answer and hang-up a call.

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Not that it helps you much, but some information anyway... The Microsoft Bluetooth stack on Windows XP does not support SCO, see http://www.techtalkz.com/microsoft-device-drivers/297889-how-can-i-get-sco-data-based-micrisoft-bluetoot-stack.html

Vista added support for it, and Windows 7 adds in-the-box support for HFP (and HSP, A2DP and AVRCP). See section "slide 15" at http://www.alanjmcf.me.uk/comms/bluetooth/Bluetooth%20in%20Windows%207.html

So seems unlikely that a third-party one can add HFP support to XP+MSFT. :-(