• EN 300 356-20 : 4.3.1

    Current The latest, up-to-date edition.

    INTEGRATED SERVICES DIGITAL NETWORK (ISDN); SIGNALLING SYSTEM NO. 7; ISDN USER PART (ISUP) VERSION 3 FOR THE INTERNATIONAL INTERFACE PART 20: COMPLETION OF CALLS ON NO REPLY (CCNR) SUPPLEMENTARY SERVICE

    Publisher:  European Telecommunications Standards Institute

    Published: 

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