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ETSI ES 201 235-4
M00001240
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ETSI ES 201 235-4 Final draft Version 1.2.1Access and Terminals (AT); Specification of Dual-Tone Multi-Frequency (DTMF) Transmitters and Receivers; Part 4: Transmitters and Receivers for use in Terminal Equipment for end-to-end signalling
standard by European Telecommunications Standards Institute, 03/01/2002
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