Today, the user is usually confronted with a lot of different multimedia- and telecommunication services in his home environment. These services are delivered on different networks, have different user-interfaces, have different billing-systems and are running on different devices. Furthermore, the services are only used separately and can not be combined. Not until these services have uniform user interfaces, one billing-system are delivered on a unified IP-based network, these would not lead to an advantage for the user as well as for the network operators and service providers....