• ITU Q.850 : 98 AMD 1 2001

    Current The latest, up-to-date edition.

    USAGE OF CAUSE AND LOCATION IN THE DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 1 AND THE SIGNALLING SYSTEM NO. 7 ISDN USER PART

    Publisher:  International Telecommunications Union (CCIR) and (CCITT)

    Published: 

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