DIN EN 300185-2:2000-01
Действует
Integrated Services Digital Network (ISDN) - Conference call, add-on (CONF) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300185-2 V 1.2.4 (1998-06) as German standard)
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