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

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Signalling network layer for circuit-mode basic call control - Part 4: Test Suite Structure and Test Purposes (TSS&TP) specification for the user; English version ETS 300403-4:1997
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

Electromagnetic compatibility and Radio spectrum Matters (ERM) - Enhanced Radio MEssage System (ERMES) - Part 3: Network aspects; English version ETS 300133-3:1997
Edition 1998-12

Intelligent Network (IN) - Intelligent Network Capability Set 1 (CS1), Core Intelligent Network Application Protocol (INAP) - Part 1: Protocol specification; English Version ETS 300374-1:1994
Edition 1995-04