DIN EN 301001-1:1999-11
Действует
Integrated Services Digital Network (ISDN) - Outgoing Call Barring (OCB) supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification [Endorsement of the English version EN 301001-1 V 1.2.2 (1998-08) as German standard]
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