Public Switched Telephone Network (PSTN) - Calling Line Identification Restriction (CLIR) supplementary service - Service description; English version ETS 300649:1997
Edition 1997-12

Integrated Services Digital Network (ISDN) - Public Switched Telephone Network (PSTN) - Universal Access Number (UAN) service - Service description; English version ETS 300710:1997
Edition 1997-12

Integrated Services Digital Network (ISDN) - Public Switched Telephone Network (PSTN) - Virtual Card Calling (VCC); service description; English version ETS 300711:1997
Edition 1997-12

Integrated Services Digital Network (ISDN) - Public Switched Telephone Network (PSTN) - Premium Rate (PRM) service; service description; English version ETS 300712:1997
Edition 1997-12

Integrated Services Digital Network (ISDN) - Public Switched Telephone Network (PSTN) - Televoting (VOT) service; service description; English version ETS 300713:1997
Edition 1997-12

Digital Video Broadcasting (DVB) - Interaction channel through Public Switched Telecommunications Network (PSTN)/Integrated Services Digital Network (ISDN); English version ETS 300801:1997
Edition 1998-06

Terminal Equipment (TE) - Narrowband networks (PSTN or ISDN) - Access to interactive audio-visual retrieval services without data-facility; access for ISDN or PSTN videophony terminals to audio-visual databases (Endorsement of the English version ETS 300834:1998 as German standard)
Edition 1999-06

Digital cellular telecommunications system (Phase 2+) - General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (Endorsement of the English version ETS 300976:2000-06 as German standard)
Edition 2001-06

Information technology - International Standardized Profile RA - Relaying the Connectionless-mode Network Service - Part 8: Definition of profile RA51.1111, relaying the Connectionless-mode - Network Service between CSMA/CD LAN subnetworks and PSDNs using virtual calls over PSTN leased line permanent access (ISO/IEC ISP 10613-8:1994) (Ersatz für ENV 41801 T 8)
Edition 1996-04-01

Attachments to Public Switched Telephone Network (PSTN) - General technical requirements for equipment connected to an analogue subscriber interface in the PSTN
Edition 1999-02-01