Digital cellular telecommunications system (Phase 2) - Line identification supplementary services - Stage 1 (Endorsement of the English version ETS 300514:1998-06 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Call Waiting (CW) and Call Hold (HOLD) supplementary services - Stage 3 (Endorsement of the English version ETS 300567:1996-08 as German standard)
Edition 2001-04

Integrated Services Digital Network (ISDN) - Three-party (3PTY) supplementary service - Digital Subscriber Signalling System No. 1 (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300188-1 V 1.2.4 (1998-06) as German standard)
Edition 2000-01

Digital cellular telecommunications system - Mobile radio interface layer 3 - Supplementary services specification; General aspects (Endorsement of the English version ETS 300941:1997-05 as German standard)
Edition 2001-06

Digital cellular telecommunications system (Phase 2) - Call Barring (CB) supplementary services - Stage 3 (Endorsement of the English version ETS 300571:1996-08 as German standard)
Edition 2001-04

Integrated Services Digital Network (ISDN) - Explicit Call Transfer (ECT) supplementary service - Functional capabilities and information flows (Endorsement of the English version EN 300368 V 1.2.2 (1998-12) as German standard)
Edition 2000-12

Integrated Services Digital Network (ISDN) - Narrowband Multi-service Delivery System (NMDS) - Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) specification for the NMDS Layer 2 PSTN-GW function (NTN side) (Endorsement of the English version EN 301141-6 V 1.1.1 (2002-02) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Narrowband Multi-service Delivery System (NMDS) - Part 8: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) specification for the PSTN NMDS interface Layer 3 (LE side) (Endorsement of the English version EN 301141-8 V 1.1.1 (2002-02) as German Standard)
Edition 2002-11

Cable networks for television signals, sound signals and interactive services - Part 2-4: Interference Mitigation Filters operating in the 700 MHz and 800 MHz bands for DTT reception; German version EN 50083-2-4:2019
Edition 2020-06

Data Link Services (DLS) System - Community Specification for application under the Single European Sky Interoperability Regulation EC 552/2004, Requirements for ground constituents and system testing (Endorsement of the English version EN 303214 V1.2.1 (2012-04) as German standard)
Edition 2012-11