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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
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
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