DIN EN 300899-1:2000-12
Действует
Integrated Services Digital Network (ISDN) - Signalling System No. 7 - Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1) - Part 1: Protocol specification (ITU-T Recommendation Q.699, modified) (Endorsement of the English version EN 300899-1 V 1.1.2 (1998-09) as German standard)
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