Integrated Services Digital Network (ISDN); conference call, add-on (CONF) supplementary service; service description; English version ETS 300183:1992
Edition 1993-09

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

Terminal Equipment (TE); syntax-based videotex lower layer protocols using packet mode access over the Public Switched Telephone Network (PSTN); English version ETS 300221:1993
Edition 1994-01

European digital cellular telecommunications system (Phase 2) - Routeing of calls to/from Public Data Networks (PDN); English version ETS 300541:1994
Edition 1995-02

Integrated Services Digital Network (ISDN); routing in support of ISUP version 1 services; english version ETS 300100:1992
Edition 1992-09

Terminal Equipment (TE); international videotex interworking between a terminal and a host; english version ETS 300106:1991
Edition 1993-04

Integrated Services Digital Network (ISDN); Calling Line Identification Presentation (CLIP) and Calling Line Identification Restriction (CLIR) supplementary services; functional capabilities and information flows; english version ETS 300091:1992
Edition 1992-12

Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; service description; english version ETS 300136:1992
Edition 1992-12

Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; functional capabilities and information flows; english version ETS 300137:1992
Edition 1992-12

Business telecommunications (BT); Open Network Provision (ONP) technical requirements; 2048 kbit/s digital unstructured leased line (D2048U); network interface presentation; English version ETS 300246:1993
Edition 1994-04