ETSI ES 201 235-1
ETSI ES 201 235-1
Specification of Dual Tone Multi-Frequency (DTMF) Transmitters and Receivers; Part 1: General Edition: 1.1.1European Telecommunications Standards Institute / 01-Sep-2000 / 7 pages
European Telecommunications Standards Institute / 01-Sep-2000 / 7 pages
The various parts of this ETSI Standard provide a complete set of requirements for all applications intending to use DTMF signalling.
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