Digital cellular telecommunications system (Phase 2) - Call Forwarding (CF) supplementary services - Stage 1 (Endorsement of the English version ETS 300515:1996-05 as German standard)
Edition 2001-04

Integrated Services Digital Network (ISDN) - Advice of charge (AOC) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300182-1 V 1.3.6 (1999-09) as German standard)
Edition 2000-12

Integrated Services Digital Network (ISDN); User-to-User Signalling (UUS) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endorsement of the English version EN 300286-5 V 1.4.1 (2003-01) as German standard)
Edition 2003-11

Integrated Services Digital Network (ISDN); Direct Dialling In (DDI) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300064-1 V 1.3.4 (1998-06) as German standard)
Edition 1999-12

Integrated Services Digital Network (ISDN) - Malicious Call Identification (MCID) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300130-1 V 1.2.4 (1998-06) as German version)
Edition 2000-01

Integrated Services Digital Network (ISDN) - Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300359-1 V 1.3.2 (2000-06) as German standard)
Edition 2001-05

Integrated Services Digital Network (ISDN); Multiple Subscriber Number (MSN) 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 300052-2 V 1.2.4 (1998-06) as German standard)
Edition 1999-12

Integrated Services Digital Network (ISDN); Call Waiting (CW) 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 300058-2 V 1.2.4 (1998-06) as German standard)
Edition 1999-12

Digital cellular telecommunications system (Phase 2+) - Mobile radio interface layer 3 supplementary services specification - Formats and coding (Endorsement of the English version ETS 300950:1999-07 as German standard)
Edition 2001-06

Integrated Services Digital Network (ISDN) - Freephone (FPH) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300210-1 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05