ETS 300661-1:1997-07

Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling System No. two (DSS2) protocol; Direct Dialling In (DDI) supplementary service - Part 1: Protocol specification (ITU-T Recommendation Q.2951, clause 1:1995, modified) (Endorsement of the English version ETS 300661-1:1997 as German standard)

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