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

Broadband Integrated Services Digital Network (B-ISDN) - AAL Type 2 Signalling protocol; Capability Set 1 - Part 1: Protocol specification (ITU-T Recommendation Q.2630.1 (1999), modified) (Endorsement of the English version EN 301816-1 V 1.1.1 (2000-11) as German standard)
Edition 2001-05

Broadband Integrated Services Digital Network (B-ISDN) - AAL, Type 2: Signalling protocol; Capability Set 1 - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 301816-2 V 1.1.1 (2001-09) as German Standard)
Edition 2002-12

Broadband Integrated Services Digital Network (B-ISDN) - AAL, Type 2 Signalling protocol; Capability Set 1 - Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification (Endorsement of the English version EN 301816-3 V 1.1.1 (2001-09) as German Standard)
Edition 2002-12

Broadband Integrated Services Digital Network (B-ISDN) - AAL Type 2 Signalling protocol; Capability Set 1 - Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification (Endorsement of the English version EN 301816-4 V 1.1.2 (2002-04) as German Standard)
Edition 2002-12

Private Telecommunication Network (PTN); signalling protocol at the S-reference point; identification supplementary services; English version ETS 300191:1992
Edition 1993-09

Private Telecommunication Network (PTN); signalling protocol at the S-reference point; circuit mode basic services; English version ETS 300192:1992
Edition 1993-09

Private Telecommunication Network (PTN) - Signalling protocol at the S-reference point - Circuit mode basic services; English version ETS 300192/A1:1996
Edition 1996-08

Broadband Integrated Services Digital Network (B-ISDN) - Meta-signalling protocol - Part 1: Protocol specification; English version ETS 300486-1:1996
Edition 1997-07

Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit mode bearer services - Inter-exchange signalling procedures and protocol
Edition 2000-03