Current IN services are basically services which provide additional capabilities-added value-to telephony calls. Therefore, IN services operate on top of the basic call model for single-connection 2-party-calls. Multiparty calls are provided by IN as an "addendum" to the "normal" basic call. In future broadband networks the basic call is expected to evolve to support multi-party multi-media and multi-connection features. In order to deal with the complexity of such a service, it is necessary to decompose the service and model it as a set of manageable elements. TINA has worked on the definition of an information model which could be used as the basis for the definition of such a future basic call model. This model is referred to as the service session graph. The article covers some TINA basics; session decomposition; and the service session graph.
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