Attachements to the Public Switched Telephone Network (PSTN) - General technical requirements for equipment connected to an analogue subscriber interface in the PSTN (Endorsement of the English version EN 300001 V 1.5.1 (1998-10) as German Standard)
Edition 2000-09

Access and terminals (AT) - Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services - Part 1: On-hook data transmission (Endorsement of the English version EN 300659-1 V 1.3.1 (2001-01) as German Standard)
Edition 2001-12

Access and terminals (AT) - Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services - Part 2: Off-hook data transmission (Endorsement of the English version EN 300659-2 V 1.3.1 (2001-01) as German Standard)
Edition 2001-12

Access and terminals (AT) - Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services - Part 3: Data link message and parameter codings (Endorsement of the English version EN 300659-3 V 1.3.1 (2001-01) as German Standard)
Edition 2001-12

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) (Endorsement of the English version EN 300823 V 1.2.2 (1999-04) as German Standard)
Edition 2000-06

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

Public Switched Telephone Network (PSTN) - Category II specification for 9600 or 4800 bits per second duplex modems standardized for use on the PSTN; English version ETS 300002:1996
Edition 1997-08

Public Switched Telephone Network (PSTN) - Basic Category I and Category II specifications for modems standardized for use on the PSTN; English version ETS 300114:1996
Edition 1997-08

Public Switched Telephone Network (PSTN) - Category II specification for 300 bit/s duplex modems standardized for use on the PSTN (Endorsement of the English version ETS 300115:1997 as German standard)
Edition 1999-06