Private Telecommunication Network (PTN); signalling at the S-reference point; generic feature key management protocol for the control of supplementary services; English version ETS 300240:1993
Edition 1993-12

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; signalling network layer for circuit-mode basic call control - Part 5: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user; English version ETS 300403-5:1997
Edition 1998-08

Human Factors (HF) - Minimum Man-Machine Interface (MMI) to public network based supplementary services; English version ETS 300738:1997
Edition 1998-04

Radio Equipment and Systems (RES) - Terrestrial Flight Telephone System (TFTS) - Packet mode data; English version ETS 300752:1997
Edition 1998-07

Intelligent Network (IN) - Intelligent Network Capability Set 1 (CS1), Core Intelligent Network Application Protocol (INAP) - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification for Service Switching Function (SSF), Specialized Resource Function (SRF) and Service Control Function (SCF); English version ETS 300374-2:1996
Edition 1996-10

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Data link layer - Part 6: Test Suite Structure and Test Purposes (TSS&TP) specification for the general protocol; English version ETS 300402-6:1997
Edition 1997-11

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol, Generic functional protocol for the support of supplementary services - Part 1: Test Suite Structure and Test Purposes (TSS&TP); English version ETS 300806-1:1998
Edition 1998-12