Sorry perhaps I have misled you on this.

The phone is connected to my bluetooth headset, when it rings it does not auto answer, i have to press answer on the phone.

On my previous Nokia handsets there was an option to tell the phone to auto answer after 2 rings when connect to BT headset but i cant find this option in N900.

@zlatko and @kureyon I have never tried that but make sense, i will try that indeed. cheers.