DIN EN 300210-2:2000-05
Действует
Integrated Services Digital Network (ISDN) - Freephone (FPH) supplementary service - Digital Subcsriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300210-2 V 1.2.4 (1998-06) as German Standard)
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