Volkswagon bluetooth universal pairing adaptor

I got the Pairing adaptor for my 06 passat sport from VW as mentioned on page 4 in the link below,Hey presto fits straight into the factory fit dash mount and paired no probs with my sony erricson K800i phone.Only problem is that there is no bluetooth activation button on the adaptor like an ordinary kit,such as the parrot.I dont have a button on the steering wheel.so when the phone rings I have to press the answer button on my phone.I can then take the call through the car kit.To end the call I have to press end on my phone.There are two buttons on the vw pairing adaptor but one is to quickdial for breakdown assistance and the other is a information quickdial number.I would rather have a blutooth button to answer and hang up the phone.Is any one aware of a way or a combination of buttons to use this as an answer or hang up function - or is there another way round this so that I can keep the phone in my pocket in the car? (part number 3C0.051.435.PA)

http://www.volkswagen-zubehoer.de/fi...004_doc_gb.pdf