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ETSI I-ETS 300 380
- Universal Personal Telecommunication (UPT); Access devices Dual Tone Multi Frequency (DTMF) sender for acoustical coupling to the microphone of a handset telephone
- standard by European Telecommunications Standards Institute, 03/01/1995
- Publisher: ETSI
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The mechanicanical & acoustical characteristics of a UPT DTMF access device which is accoustically coupled to the microphone of a handset telephony terminal.
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