Any way to get Bluetooh headset to override wired jack (for calls) on a GSM Treo?

[brett]

I have a GSM Treo with the wired jack connected to the "AUX in" on my car stereo for playing of Audiobooks via Audible and MP3s.

I would like to be able to use a Bluetooth headset to make and receive calls (while the audio-out jack is still connected to my car) , but there doesn't appear to be a way to get the bluetooth headset to override the wired jack for phone calls on a GSM Treo.

Apparently this is not an issue w/ CDMA Treos.
They behave in this manner by default.

So when a call comes in, I would like to re-route the audio to the Bluetooth headset so I can take the call, then when I terminate the call the audio would be re-routed back to the wired jack so I can continue listening to my book/music.

Does anyone know of any applications that I could use to either manually do this or have it occur automatically?

I tried this with a Bluetooth Stereo headset and Softick Audio Gateway, but even that could not override the wired jack when it is connected.

Any help would be greatly appreciated.

Thanks

-Brett