As far as I underastand I can request for tutorial here
It will be very good to have a tutorial "How to work with address book". Specialy I am interested in the way of the integration with internal Andoid's address book. For example how to add a new field to the contacts. There are a list of fileds there. They are Mobile, Home, ..., SMS. I want to add SIP address there to re-use already existing mechanism.