Equipment Engineering (EE) - Acoustic noise emitted by telecommunications equipment; English version ETS 300753:1997
Edition 1998-08

Private Telecommunication Network (PTN) - Reference configuration - Part 1: Reference configuration for PTN eXchanges (PTNX) [ISO/IEC 11579-1 (1994), modified]; English version ETS 300475-1:1995
Edition 1996-06

Terminal Equipment (TE); videotex; audio syntax; english version ETS 300149:1992
Edition 1992-11

Private Integrated Services Network (PISN) - Specification, functional models and information flows - Identification supplementary services [ISO/IEC 14136 (1995), modified] (Endorsement of the English version ETS 300173:1996 as German standard)
Edition 2000-06

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Circuit Mode Bearer Services - Inter-Exchange Signalling Procedures and Protocol
Edition 2001-02-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Specification, Functional Model and Information Flows - Simple Dialog Supplementary Service
Edition 2004-01-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Specification, Functional Model and Information Flows - Message Waiting Indication Supplementary Service
Edition 2004-12-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Specification, Functional Model and Information Flows - Call Interception Additional Network Feature
Edition 2004-12-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Specification, Functional Model and Information Flows - Recall Supplementary Service
Edition 2004-12-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Inter-Exchange Signalling Protocol - Path Replacement Additional Network Feature
Edition 2004-12-01