Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control - Part 1: Protocol specification [ITU-T-Recommendation Q.931 (1993), modified] (Endorsement of the English version EN 300403-1 V 1.3.2 (1999-11) as German standard)
Edition 2000-10

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control - Part 2: Specification and Description language (SDL) diagrams (Endorsement of the English version EN 300403-2 V 1.3.1 (2000-11) as German standard)
Edition 2001-05

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1); Signalling network layer for circuit-mode basic call control - Part 3: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300403-3 V 1.4.1 (2001-05) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control - Part 6: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endorsement of the English version EN 300403-6 V 1.2.2 (2000-02) as German Standard)
Edition 2002-12

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control - Part 7: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network (Endorsement of the English version EN 300403-7 V 2.1.2 (2000-02) as German standard)
Edition 2000-12

Fixed radio systems - Point-to-point equipment - Parameters for digital radio systems for the transmission of digital signals operating at 55 GHz (Endorsement of the English version EN 300407 V 1.3.1 (2001-08) as German Standard)
Edition 2002-01

Fixed Radio Systems - Point-to-point equipment - Parameters for digital radio systems for the transmission of digital signals and analogue video signals operating at around 58 GHz, which do not require co-ordinated frequency planning (Endorsement of the English version EN 300408 V 1.3.1 (2002-11) as German standard)
Edition 2003-11

Network Aspects (NA) - Availability performance of path elements of international digital paths (Endorsement of the English version EN 300416 V 1.2.1 (1998-08) as German standard)
Edition 2000-09

Transmission and Multiplexing (TM) - Generic requirements for transport functionality of equipment - Part 1-1: Generic processes and performance (Endorsement of the English version EN 300417-1-1 V 1.2.1 (2001-10) as German Standard)
Edition 2002-06

Transmission and Multiplexing (TM) - Generic requirements for transport functionality of equipment - Part 1-2: General information about Implementation Conformance Statement (ICS) proforma (Endorsement of the English version EN 300417-1-2 V 1.1.3 (1999-05) as German Standard)
Edition 2000-06