Private Integrated Services Network (PISN) - Specification, functional models and information flows - Recall supplementary service (ISO/IEC 15051 (2003), modified) (Endorsement of the English version EN 301257 V1.2.1 (2004-01) as German standard)
Edition 2004-12

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Recall supplementary service (ISO/IEC 15052 (2003), modified) (Endorsement of the English version EN 301258 V1.2.1 (2004-01) as German standard)
Edition 2004-12

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

Private Integrated Services Network (PISN) - Specification, functional models and information flows - Message waiting indication supplementary service (ISO/IEC 15505 (2003), modified) (Endorsement of the English version EN 301260 V1.2.1 (2004-01) as German standard)
Edition 2004-12

Telecommunications Management Network (TMN) - Security - Part 3: Security services - Authentication of users and entities in a TMN environment (Endorsement of the English version EN 301261-3 V 1.2.1 (1999-01) as German Standard)
Edition 1999-12

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Advice of charge supplementary services (ISO/IEC 15050 (2003), modified) (Endorsement of the English version EN 301264 V1.2.1 (2004-01) as German standard)
Edition 2004-12

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Call interception Additional Network Feature (ANF) (ISO/IEC 15054 (2003), modified) (Endorsement of the English version EN 301265 V1.2.1 (2004-01) as German standard)
Edition 2004-12

Telecommunications Management Network (TMN) - Linear multiplex section protection configuration information model for the Network Element (NE) view (Endorsement of the English version EN 301268 V 1.1.1 (1999-05) as German Standard)
Edition 1999-12

Telecommunications Management Network (TMN) - Management interfaces associated with the VB5.1 reference point (Endorsement of the English version EN 301271 V 1.2.1 (2001-07) as German Standard)
Edition 2001-12

Cordless Terminal Mobility (CTM) - Phase 2 - Service description (Endorsement of the English version EN 301273 V 1.1.3 (2000-01) as German standard)
Edition 2000-10