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1.1. ISDN Features and Benefits

The Integrated Services Digital Network (ISDN) is a digital communications network capable of carrying all forms (voice, computer and facsimile) of digitized data between switched end points. This network is a digital-switched system that makes a connection only when requested.

Control over switched connections is provided by a protocol of messages that pass between the two ends of the digital link. Any type of equipment can be connected to an ISDN, provided the equipment is capable of generating a digital bit stream that conforms to ISDN standards.

ISDN technology offers the benefits inherent in digital connectivity such as fast connection (setup and tear-down), fast Direct Dialing In service (DDI), and fast Automatic Number Identification (ANI) acquisition. In addition, ISDN Primary Rate Interface (PRI) applications can take advantage of the following features, if offered by the network (see Appendix B, "ISDN Call Scenarios", for details):


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