Val J. Pietrasiewicz, J. Jay Austin, and Robert F. Linfield

Abstract: The factors that affect the design of a numbering plan for the Integrated Services Digital Network (ISDN) involved a complex interplay between existing plans, national priorities, and technical system limitations. These factors are the subject of this report. Desirable attributes of any numbering plan are explained, existing standards covering various plans are discussed and some actual plans currently in use are examined. The development of the Numbering plan for ISDN by the Consultative Committee for International Telegraph and Telephone is essentially complete. However there is still a need to understand and make sense of the relationship of all of the standardized plans and the implications on interworking as public networks evolve toward the ISDN concept and technology.

Keywords: ISDN; addressing; interworking; numbering plans; telephony

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

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