Integrated Services Digital Network (ISDN) - Call Forwarding Busy (CFB) supplementary service - Service description (Endorsement of the English version EN 300199 V 1.2.1 (2001-06) as German standard)
Edition 2002-07

Integrated Services Digital Network (ISDN) - Call Forwarding No Reply (CFNR) supplementary service - Service description (Endorsement of the English version EN 300201 V 1.2.1 (2001-05) as German standard)
Edition 2002-07

Integrated Services Digital Network (ISDN) - Diversion supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300207-1 V 3.1.1 (2001-06) 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

Integrated Services Digital Network (ISDN) - Diversion supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification for the user (Endorsement of the English version EN 300207-3 V 3.1.1 (2001-06) as German Standard)
Edition 2002-03

Integrated Services Digital Network (ISDN) - Diversion 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 300207-4 V 3.1.1 (2001-11) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Diversion supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endorsement of the English version EN 300207-5 V 3.1.1 (2001-06) as German Standard)
Edition 2002-03

Integrated Services Digital Network (ISDN); Diversion 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 300207-6 V 3.2.1 (2003-01) as German standard)
Edition 2003-11

Private Integrated Services Network (PISN) - Specification, functional models and information flows - Call diversion supplementary service (ISO/IEC 13872 (2003), modified) (Endorsement of the English version EN 300256 V1.3.1 (2004-01) as German standard)
Edition 2004-12

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Call diversion supplementary service (ISO/IEC 13873 (2003), modified) (Endorsement of the English version EN 300257 V1.3.1 (2004-01) as German standard)
Edition 2004-12