Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems
Edition 2009-04-30

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 which network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) signalling
Edition 1999-09-01

TERMINAL EQUIPMENT (TE). ATTACHMENT REQUIREMENTS FOR PAN-EUROPEAN APPRoval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE (excluding TE supporting the voice telephony service) in which network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) singalling.
Edition 1998-09-29

European digital cellular telecommunications system (Phase 2) - Support of Dual Tone Multi-Frequency signalling (DTMF) via the GSM system; English version ETS 300532:1994
Edition 1995-01

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

Multi-channel radio-frequency connectors - Part 2: Sectional specification for MQ4 series circular connectors
Edition 2021-06-02

Multi-channel radio-frequency connectors - Part 2: Sectional specification for MQ4 series circular connectors (IEC 46F/605/CD:2021); Text in German and English
Edition 2023-06

Multi-channel radio-frequency connectors - Part 2: Sectional specification for MQ4 series circular connectors (IEC 46F/627/CDV) (english version)
Edition 2022-11-15

Universal Personal Telecommunication (UPT). Access devices. Dual Tone Multi Frequency (DTMF) sender for acoustical coupling to the microphone of a handset telephone
Edition 1998-04-01

Multi-channel radio-frequency connectors - Part 2: Sectional specification for MQ4 series circular connectors (IEC 63138-2:2020); German version EN IEC 63138-2:2021
Edition 2022-05