Point-to-multipoint call modelling for IN/B-ISDN integration

This paper deals with integration of IN and B-ISDN for the support of new sophisticated multimedia multipoint services. A survey of results of the ACTS INSIGNIA project is given, successively some enhancements of the INSIGNIA architecture in order to integrate advanced B-ISDN capability are discussed. In particular, the impact of point-to-multipoint on the IN call modelling is considered and the needed enhancements of the Basic Call State Model are presented. Moreover, the evolution of the IN Service Switching Functions (SSF) entity and of the interface with the IN Service Control Function (SCF) entity is investigated. Finally an experimental test-bed developed in the framework of the CORITEL IBIS project is described. This test bed aims at validating, with reference to the control-plane, the main features of the proposed architecture.