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

Telecommunications Management Network (TMN) - Management interfaces associated with the VB5.2 reference point (Endorsement of the English version EN 301754 V 1.1.1 (2001-09) as German Standard)
Edition 2002-11

Private Integrated Services Network (PISN) - Use of QSIG at the C reference point between a PINX and an interconnecting network (ISO/IEC 20161 (2001), modified) (Endorsement of the English version EN 301914 V1.1.1 (2004-01) as German standard)
Edition 2004-12

Private Telecommunication Network (PTN); signalling at the S-reference point; generic keypad protocol for the support of supplementary services; English version ETS 300190:1992
Edition 1993-09

Private Telecommunication Network (PTN); signalling protocol at the S-reference point; identification supplementary services; English version ETS 300191:1992
Edition 1993-09

Private Telecommunication Network (PTN); signalling protocol at the S-reference point; circuit mode basic services; English version ETS 300192:1992
Edition 1993-09

Private Telecommunication Network (PTN) - Signalling protocol at the S-reference point - Circuit mode basic services; English version ETS 300192/A1:1996
Edition 1996-08

Private Telecommunication Network (PTN); signalling at the S-reference point; generic feature key management protocol for the control of supplementary services; English version ETS 300240:1993
Edition 1993-12

Private Integrated Services Network (PISN) - Use of QSIG at the C reference point between a PINX and an interconnecting network (V1.1.1)
Edition 2004-06-01