No abstract

The network of stored program control communication processors interconnected with common‐channel interoffice signaling (ccis) is commonly referred to as the Stored Program Controlled (spc) Network. The spc network will result in new call handling and routing improvements and in new network‐based services. It is desirable to tailor the services to meet special customer needs and to deploy them rapidly. A generic plan is described which provides a basis for building services from basic functional capabilities that are deployed in network action points and controlled by network control points. Terminating‐end office features can be used to provide additional customer service options. Thus, service for a customer can be composed of sequences of actions stored at appropriate network central points using basic switching capabilities deployed in the network. As needs for customer service evolve, new capabilities can be added to the repertoire of existing capabilities. By equipping key nodes with the capabilities described, the generic plan will also allow the spc network to evolve efficiently to meet future customer needs.

This paper traces the evolution of the AT&T common channel signaling (CCS) network from its initial deployment as the common channel interoffice signaling (CCIS) network in 1976 to its present and future forms. Since the introduction of CCIS, the network has: added datagram direct‐signaling capability, been reconfigured as a result of the AT&T divestiture, and been modernized by new digital and processor technology and by developments in software engineering techniques. In addition, the CCS network has become a key part of the AT&T service architecture, allowing faster nationwide deployment of services. The globalization and further functional enhancements of the network are also discussed.

A B S "This paper dcrcribes work done by AT&K KDD and BTI to define an international common channel signalling specijication based on CCl'IT No. 7 for use in supporting international serv- ices.Thir work began in I986 with the goal of reaching agreement on a signaIlingprrrtocol specification that would be the bas& for supporting new and hpmved international services.As a result of this work, a specification forIntegrated.5ervice.s Digital Network User Pprt (ISUP) has been written to initially provide a fronrovork for operations among the k e companies, rmd, late5 pot&& wrldwide.