Integrated Services Digital Network (ISDN) - Signalling System No. 7; Signalling Connection Control Part (SCCP) - Interoperability test specification (Endorsement of the English version EN 301008 V 1.1.2 (1998-05) as German standard)
Edition 1999-09

Integrated Services Digital Network (ISDN) - Advice of charge (AOC) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300182-1 V 1.3.6 (1999-09) as German standard)
Edition 2000-12

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) - Signalling System No. 7; Operations, Maintenance and Administration Part (OMAP) - Part 1: Protocol specification (Endorsement of the English version EN 301007-1 V 1.1.3 (1998-05) as German standard)
Edition 1999-09

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) - 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

Broadband Integrated Services Digital Network (B-ISDN) - Signalling System No. 7; B-ISDN User Part (B-ISUP) - Part 9: Network generated session identifier [ITU-T Recommendation Q.2726.3 (1996)] (Endorsement of the English version EN 301029-9 V 1.1.2 (1998-04) as German standard)
Edition 1999-09

Integrated Services Digital Network (ISDN) - Signalling System No. 7 - Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1) - Part 1: Protocol specification (ITU-T Recommendation Q.699, modified) (Endorsement of the English version EN 300899-1 V 1.1.2 (1998-09) as German standard)
Edition 2000-12

Broadband Integrated Services Digital Network (B-ISDN) and Broadband Private Integrated Services Network (B-PISN) - Digital Subscriber Signalling System No. two (DSS2); Broadband Inter-Exchange Signalling (B-QSIG) and Signalling System No. 7 (SS7); Prenegotiation - Part 1: Protocol specification (Endorsement of the English version EN 302091-1 V 1.1.3 (1999-11) as German standard)
Edition 2000-10

Broadband Integrated Services Digital Network (B-ISDN) and Broadband Private Integrated Services Network (B-PISN) - Digital Subscriber Signalling System No. two (DSS2); Broadband Inter-Exchange Signalling (B-QSIG) and Signalling System No. 7 (SS7); Prenegotiation - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 302091-2 V 1.1.3 (1999-11) as German standard)
Edition 2000-10