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)
Edition 2000-05

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300286-1 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) 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 300286-2 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification for the user (Endorsement of the English version EN 300286-3 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - Generic keypad protocol for the support of supplementary services - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300122-1 V 1.2.4 (1998-06) as German standard)
Edition 2000-01

Digital Enhanced Cordless Telecommunications (DECT) - Integrated Services Digital Network (ISDN); ISDN Mobility protocol Interworking specification Profile (IMIP) - Part 2: DECT/ISDN interworking for Global System for Mobile communications (GSM) support (Endorsement of the English version EN 301361-2 V 1.1.1 (2000-02) as German standard)
Edition 2000-09

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)
Edition 2000-12

Integrated Services Digital Network (ISDN) - Signalling System No. 7 - ISDN User Part (ISUP) version 3 interactions with the Intelligent Network Application Part (INAP) - Part 1: Protocol specification (ITU-T Recommendation Q.1600 (1997), modified) (Endorsement of the English version EN 301070-1 V 1.2.2 (1998-09) as German standard)
Edition 2000-12

Integrated Services Digital Network (ISDN); Line Hunting (LH) supplementary service - Digital Subscriber Signalling System No. one (DSS1) - Part 1: Protocol specification (Endorsement of the English version EN 301484-1 V 1.1.1 (2000-04) as German standard)
Edition 2001-02

Integrated Services Digital Network (ISDN) - Explicit Call Transfer (ECT) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300369-1 V 1.2.4 (1998-10) as German standard)
Edition 2000-10