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

Public Switched Telephone Network (PSTN) - Calling Line Identification Restriction (CLIR) supplementary service - Service description
Edition 2000-06-01

Public Switched Telephone Network (PSTN) - Subscriber line protocol over the local loop for display (and related) services - Part 1: one hook data transmission
Edition 2000-09-01

Public switched telephone Network (PSTN) - Suscriber line protocol over the local loop for display (and related) services - Part 2: off-hook data transmission
Edition 2000-09-01

Integrated Services Digital Network (ISDN) - Public Switched Telephone Network (PSTN) - Universal Access Number (UAN) service - Service description
Edition 2001-03-01

Integrated Services Digital Network (ISDN) - Public Switched Telephone Network (PSTN) - Virtual Card Calling (VCC) - Service description
Edition 2001-03-01

Integrated Services Digital Network (ISDN) - Public switched Telephone Network (PSTN) - Premium Rate (PRM) service - Service description
Edition 2001-05-01

Integrated Services Digital Network (ISDN) - Public Switched Telephone Network (PSTN) - Televoting (VOT) service - Service description
Edition 2001-03-01

Universal Personal Telecommunication (UPT) - UPT phase 2 - Functional specification of the interface of a UPT Integrated Circuit Card (ICC) and Public Switched Telephone Network (PSTN), Integrated Services Digital Network (ISDN) and Global System for Mobile communications (GSM) terminals (one pass and multiple pass authentication); Conformance test specification (Endorsement of the English version EN 301363 V 1.1.2 (1999-05) as German Standard)
Edition 2001-08

Terminal Equipment (TE) - Attachment requirements for pan-European approval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE supporting the voice telephony service in wich network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) signalling (Endorsement of the English version EN 301437 V 1.1.1 (1999-06) as German standard)
Edition 2000-10