Integrated Services Digital Network (ISDN) - Outgoing Call Barring (OCB) supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification [Endorsement of the English version EN 301001-1 V 1.2.2 (1998-08) as German standard]
Edition 1999-11

Integrated Services Digital Network (ISDN) - Generic functional protocol for the support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network (Endorsement of the English version EN 300196-6 V 1.2.1 (2001-11) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Generic functional protocol for the support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user (Endorsement of the English version EN 300196-4 V 1.2.1 (2001-11) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Generic functional protocol for the support of supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300196-2 V 1.3.2 (2001-06) as German Standard)
Edition 2002-03

Intelligent Network (IN) - Intelligent Network Capability Set 3 (CS3); Intelligent Network Application Protocol (INAP); Protocol specification - Part 4: SDLs for SCF-SSF interface (Endorsement of the English version EN 301931-4 V 1.1.2 (2001-09) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Freephone (FPH) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300210-1 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - Explicit Call Transfer (ECT) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300369-1 V 1.2.4 (1998-10) as German standard)
Edition 2000-10

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300286-1 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - Conference call, add-on (CONF) supplementary service - Digital Subscriber Signalling System No. one (DSS 1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300185-1 V 1.2.4 (1998-06) as German standard)
Edition 2000-01

Integrated Services Digital Network (ISDN) - Supplementary service interactions; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network (Endorsement of the English version EN 300195-6 V 1.2.1 (2000-11) as German standard)
Edition 2001-09