ETSI TS 101 235-4-2000 Specification of Dual Tone Multi-Frequency (DTMF) Tranmitters and Receivers Part 4 Receivers for Use in Terminal Equipment for End-to-End Signalling《双音多频(DTM_1.pdf

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ETSI TS 101 235-4-2000 Specification of Dual Tone Multi-Frequency (DTMF) Tranmitters and Receivers Part 4 Receivers for Use in Terminal Equipment for End-to-End Signalling《双音多频(DTM_1.pdf_第1页
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