Transmission and Multiplexing (TM) - Physical and electrical characteristics of hierarchical digital interfaces for equipment using the 2048 kbit/s-based plesiochronous or synchronous digital hierarchies; (Endorsement of the English version EN 300166 V 1.2.1 (2001-09) as German Standard)
Edition 2002-06

Private Integrated Services Network (PISN) - Service description, functional capabilities and information flows - Circuit-mode 64 kbit/s bearer services [ISO/IEC 11574 (2000) modified] (Endorsement of the English version EN 300171 V1.3.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Circuit-mode basic services [ISO/IEC 11572 (2000) modified] (Endorsement of the English version EN 300172 V1.5.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Name identification supplementary services [ISO/IEC 13864 (1995) modified] (Endorsement of the English version EN 300237 V1.3.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Call offer supplementary service [ISO/IEC 14841 (1996) modified] (Endorsement of the English version EN 300361 V1.3.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Call completion supplementary services [ISO/IEC 13866 (1995) modified] (Endorsement of the English version EN 300365 V1.3.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Do not disturb and do not disturb override supplementary services [ISO/IEC 14842 (1996) modified] (Endorsement of the English version EN 300363 V1.3.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Call intrusion supplementary service [ISO/IEC 14845 (1996) modified] (Endorsement of the English version EN 300425 V1.3.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Advice of charge supplementary services [ISO/IEC 15049 (1997) modified] (Endorsement of the English version EN 301254 V1.2.1 (2003-06) as German standard)
Edition 2004-03

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Private User Mobility (PUM) - Call handling additional network features [ISO/IEC 17877 (2000) modified] (Endorsement of the English version EN 301657 V1.2.1 (2003-06) as German standard)
Edition 2004-03