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Standards [CURRENT]

DIN ETS 300532

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

Standards [CURRENT]

XP Z89-380 ; XP I-ETS 300380:1998-04-01

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

Standards [CURRENT]

NF Z83-532 ; NF ETS 300532:1996-09-01

Digital cellular telecommunications system (phase 2). Support of dual tone multi-frequency signalling (DTMF) via the GSM system (GSM 03.14)
Edition 1996-09-01

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