• EN 300 356-19 : 4.2.1

    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 19: THREE-PARTY (3PTY) SUPPLEMENTARY SERVICE

    Publisher:  European Telecommunications Standards Institute

    Published: 

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