ETSI TS 101 235-1
ETSI TS 101 235-1
Specification of Dual Tone Multi-Frequency (DTMF) Transmitters and Receivers; Part 1: General Edition: 1.1.1European Telecommunications Standards Institute / 01-May-2000 / 7 pages
The various parts of this ETSI Technical Specification provide a complete set of requirements for all applications intending to use DTMF signalling.
Note: This is a withdrawn item.