Thanks Richard for a quick reply!

Audio 30 does not have a CLR button or keypad either. I popped by a dealer and they weren't able to help with the issue as they had no car with the correct telephone equipment available.

However, I managed to to get into another car and make the pairing in a 2006 S203 with audio 50, and now the cradle works also in my car. SAP V2 takes the control of the phone, but I can use the steering wheel controls to scroll through and dial contacts stored in the SIM card.