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); 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) - 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); Digital Subscriber Signalling System No. one (DSS1) protocol - Data link layer - Part 7: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the general protocol (Endorsement of the English version EN 300402-7 V 1.4.5 (2000-08) as German standard)
Edition 2001-02

V interfaces at the digital Local Exchange (LE) - V5.1 interface for the support of Access Network (AN) - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300324-2 V 2.1.1 (2000-04) as German standard)
Edition 2001-09

Integrated Services Digital Network (ISDN) - Calling Line Identification Presentation (CLIP) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300092-1 V 2.1.1 (2001-02) as German standard)
Edition 2001-09

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

Terrestrial Trunked Radio (TETRA) - Packet Data Optimized (PDO) - Part 11: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version ETS 300393-11:1998 as German standard)
Edition 1999-12