Attachements to the Public Switched Telephone Network (PSTN) - General technical requirements for equipment connected to an analogue subscriber interface in the PSTN (Endorsement of the English version EN 300001 V 1.5.1 (1998-10) as German Standard)
Edition 2000-09

Integrated Services Digital Network (ISDN) - Signalling System No. 7 - Message Transfer Part (MTP) to support international interconnection - Part 1: Protocol specification [ITU-T Recommendations Q.701, Q.702, Q.703, Q.704, Q.705, Q.706, Q.707 and Q.708 modified] (Endorsement of the English version EN 300008-1 V1.3.2 (2003-06) as German standard)
Edition 2004-07

Integrated Services Digital Network (ISDN) - Signalling system No. 7; Signalling Connection Control Part (SCCP) (connectionless and connection-oriented) to support international interconnection - Part 1: Protocol specification (ITU-T-Recommendation Q.711 to Q.716, modified); (Endorsement of the English version ETS 300009-1 V 1.4.3 (2001-02) as German Standard)
Edition 2001-09

Integrated Services Digital Network (ISDN) - Signalling System No. 7 (SS7); Signalling Connection Control Part (SCCP) (connectionless and connection-oriented class 2) to support international interconnection - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300009-2 V 1.4.1 (2002-04) as German standard)
Edition 2003-08

Integrated Services Digital Network (ISDN) - Primary rate User Network Interface (UNI) - Part 1: Layer 1 specification (Endorsement of the English version EN 300011-1 V 1.2.2. (2000-05) as German standard)
Edition 2001-05

Integrated Services Digital Network (ISDN) - Basic User Network Interface (UNI) - Part 1: Layer 1 specification (Endorsement of the English version EN 300012-1 V 1.2.2. (2000-05) as German standard)
Edition 2001-05

Equipment Engineering (EE) - Environmental conditions and environmental tests for telecommunications equipment - Part 1-0: Classification of environmental conditions; Introduction (Endorsement of the English version EN 300019-1-0 V2.1.2 (2003-05) as German standard)
Edition 2004-03

Environmental Engineering (EE) - Environmental conditions and environmental tests for telecommunications equipment - Part 1-1: Classification of environmental conditions; Storage (Endorsement of the English version EN 300 019-1-1 V2.2.1 (2014-04) as German standard)
Edition 2016-02

Environmental Engineering (EE) - Environmental conditions and environmental tests for telecommunications equipment - Part 1-2: Classification of environmental conditions; Transportation (Endorsement of the English version EN 300 019-1-2 V2.2.1 (2014-04) as German standard)
Edition 2016-02

Environmental Engineering (EE) - Environmental conditions and environmental tests for telecommunications equipment - Part 1-3: Classification of environmental conditions; Stationary use at weatherprotected locations (Endorsement of the English version EN 300 019-1-3 V2.4.1 (2014-04) as German standard)
Edition 2016-02