The role of ISDN in AT&T information systems architecture

AT&T Information Systems Architecture defines a framework for compatibility among AT&T products as well as with key products of other vendors. A key direction of Information Systems Architecture is the use of standard, open interfaces and protocols. Standards now being defined for the Integrated Services Digital Network (ISDN) play an important role in the architecture. Support of ISDN will provide customers with uniform access to integrated voice and data capabilities which are provided through digital transmission and common channel signaling. Support of ISDN within Information Systems Architecture promises to provide customers with compatibility and high functionality. The AT&T Information Systems PBX product family already supports many capabilities that provide ISDN functionality. These capabilities make incorporation of ISDN in Information Systems Architecture and full support of ISDN a direct step in product evolution.