A835 & Bluetooth headset?

Hi,

I've just got a bluetooth headset (Plantronics M3000) for my A835 and
have only one problem with it!

I can't make the phone sound its ordinary signal when I get an
incoming call. I only get small beeps out of the headset and if I
select the "ring and vibrate" mode the phone vibrates but doesn't ring
at all. This is despite whatever selection I make under
settings->portable headset...

Anyone knows?

Regards

JP