• EN 300 356-21 : 4.2.1

    Current The latest, up-to-date edition.

    INTEGRATED SERVICES DIGITAL NETWORK (ISDN); SIGNALLING SYSTEM NO. 7 (SS7); ISDN USER PART (ISUP) VERSION 4 FOR THE INTERNATIONAL INTERFACE; PART 21: ANONYMOUS CALL REJECTION (ACR) SUPPLEMENTARY SERVICE

    Publisher:  European Telecommunications Standards Institute

    Published: 

    Add To Cart

    add to cart