• EN 300 403-1 : 1.3.2

    Current The latest, up-to-date edition.

    INTEGRATED SERVICES DIGITAL NETWORK (ISDN) - DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. ONE (DSS1) PROTOCOL - SIGNALLING NETWORK LAYER FOR CIRCUIT-MODE BASIC CALL CONTROL - PART 1: PROTOCOL SPECIFICATION [ITU-T RECOMMENDATION Q.931 (1993) MODIFIED]

    Publisher:  European Telecommunications Standards Institute

    Published: 

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