A layered approach for IN call modelling for the support of multimedia services in a B-ISDN environment

This paper deals with the integration between the intelligent network and the B-ISDN for the support of advanced multimedia services. The intelligent network (IN) introduces new capabilities for service provisioning and service handling. On the other hand, significant steps in the B-ISDN standardisation have been made, promoting an advanced signalling system to support multimedia services. These services call for new requirements and introduce more complexity on the control protocols. For these reasons, it is evident that an integration of these two architectures will be very useful for the realisation of a global network, service independent, flexible and efficient in resource utilisation. We investigate the different possibilities for an IN/B-ISDN interaction; in particular we propose a new architecture for the basic call state model and for the service switching function, in order to fully exploit the advantages introduced by B-ISDN signalling.