Integrated Services Digital Network (ISDN); Terminal Portability (TP) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300055-1 V 1.2.4 (1998-06) as German standard)
Edition 1999-12

Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony, audiographic conference and videoconference teleservices - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300267-2 V 1.3.2 (2000-05) as German standard)
Edition 2001-02

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1); Signalling network layer for circuit-mode basic call control - Part 3: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300403-3 V 1.4.1 (2001-05) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Diversion supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300207-2 V 3.1.1 (2001-06) as German Standard)
Edition 2002-11

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Generic functional protocol for the support of supplementary services [ISO/IEC 11582 (2002) modified] (Endorsement of the English version EN 300239 V1.3.1 (2003-06) as German standard)
Edition 2004-03

Integrated Services Digital Network (ISDN) - Malicious Call Identification (MCID) supplementary service; 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 300130-4 V 1.3.2 (2000-06) as German standard)
Edition 2000-12

Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; 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 300141-4 V 1.3.3 (2000-05) as German standard)
Edition 2001-02

Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony, audiographic conference and videotelephony teleservices - 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 300267-6 V 1.2.6 (2000-06) as German standard)
Edition 2001-02

Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling System No. two (DSS2) protocol; Switched virtual path capability - Part 1: Protocol specification (ITU-T Recommendation Q.2934 (1999), modified) (Endorsement of the English version EN 301487-1 V 1.1.1 (2000-09) as German standard)
Edition 2001-05

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Generic functional protocol for the support of supplementary services at the "b" service entry point for Virtual Private Network (VPN) applications - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 301061-2 V 1.1.3 (1998-10) as German standard)
Edition 2000-04