The feasibility of the concepts are tested in a demonstrator which allows access from public networks. Full functionality is available for Euro-ISDN, and for GSM, but it has also been achieved to integrate existing simple telephones. As multimedia messaging is the service most likely to be taken up by a large part of the business community in the near future, the applications shown in the demonstrator are concentrated around a personal message service.
Special emphasis is placed on the security and database architecture.
The IN concept proved to be a useful platform for the development of the PSCS demonstrator. The use of standardized interfaces and protocols allows easy migration from PSCS as a value added service to PSCS as a public network service. The success of PSCS and PSCS like services will depend on the simplicity of services access. It is thus important to continue this work in large scale experiments with real users using the service in their everyday work over a longer period of time. The following sections give a survey of the cooperation of services and discuss realization alternatives and their performance implications.