Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Private Integrated Network eXchange (PINX) clock synchronization (ISO/IEC 15507 (1997), modified) (Endorsement of the English version EN 301259 V 1.1.1 (1998-10) as German standard)
Edition 2000-03

Digital cellular telecommunications system (Phase 2+) - GSM Cordless Telephony System (CTS), Phase 1 - Service description - Stage 1 (GSM 02.56 version 8.0.1 Release 1999) (Endorsement of the English version EN 302403 V8.0.1 (2000-10) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Functional requirements for static circuit-mode inter-PINX connections (ISO/IEC 14474 (1998), modified) (Endorsement of the English version EN 301765 V 1.1.1 (2000-08) as German standard)
Edition 2001-06

Corporate telecommunication Networks (CN) - Signalling interworking between QSIG and H.323 - Call Diversion supplementary services (ISO/IEC 21411 (2001), modified) (Endorsement of the English version EN 301906 V 1.1.1 (2003-02) as German standard)
Edition 2003-07

Corporate telecommunication Networks (CN) - Signalling interworking between QSIG and H.323 - Call Completion supplementary services (ISO/IEC 21991 (2002), modified) (Endorsement of the English version EN 301989 V 1.1.1 (2003-02) as German standard)
Edition 2003-07

Digital cellular telecommunications system (Phase 2) - Multi Party (MPTY) supplementary services - Stage 1 (Endorsement of the English version ETS 300517:1996-05 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Call Barring (CB) supplementary services - Stage 1 (Endorsement of the English version ETS 300520:1996-05 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Call Forwarding (CF) supplementary services - Stage 3 (Endorsement of the English version ETS 300566:1996-08 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Call Forwarding (CF) supplementary services - Stage 2 (Endorsement of the English version ETS 300543:1997-01 as German standard)
Edition 2001-04

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