Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300058-1 V 1.2.4 (1998-06) as German standard)
Edition 1999-12

Integrated Services Digital Network (ISDN); Subaddressing (SUB) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300061-1 V 1.2.4 (1998-06) as German standard)
Edition 1999-12

Integrated Services Digital Network (ISDN) - Message Waiting Indication (MWI) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300745-1 V 1.2.4 (1998-06) as German standard)
Edition 1999-11

Integrated Services Digital Network (ISDN) - Line Hunting (LH) supplementary service; Digital Subscriber Signalling System No. one (DSS1) - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 301484-2 V 1.1.1 (2000-04) as German standard)
Edition 2001-02

Integrated Services Digital Network (ISDN); Signalling System No. 7 (SS7); ISDN User Part (ISUP) version 4 for the international interface - Part 2: ISDN supplementary service (ITU-T Recommendation Q.730 (1999), modified) (Endorsement of the English version EN 300356-2 V 4.2.1 (2002-07) as German standard)
Edition 2003-08

Methods of measurement for equipment used in digital microwave radio transmission systems - Part 2: Measurements on terrestrial radio-relay systems - Section 9: Services channels (IEC 60835-2-9:1995); German version EN 60835-2-9:1995
Edition 1996-06

Digital Enhanced Cordless Telecommunications (DECT) - Global System for Mobile communications (GSM) - DECT/GSM Interworking Profile (IWP); GSM Phase 2 supplementary services implementation (Endorsement of the English version EN 300703 V 1.2.2 (1998-02) as a German standard)
Edition 1999-07

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Wireless terminal location registration supplementary service and wireless terminal information exchange additional network feature [ISO/IEC 15428 (1999) modified] (Endorsement of the English version EN 301824 V1.1.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Wireless terminal location registration supplementary service and wireless terminal information exchange Additional Network Feature (ANF) (ISO/IEC 15429 (2003), modified) (Endorsement of the English version EN 301825 V1.1.1 (2004-01) as German standard)
Edition 2004-12

Corporate telecommunication Networks (CN) - Signalling interworking between QSIG and H.323 - Generic functional protocol for the support of supplementary services (ISO/IEC 21409 (2001), modified) (Endorsement of the English version EN 301905 V 1.1.1 (2003-02) as German standard)
Edition 2003-07