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ETSI TS 100 532
M00001479
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ETSI TS 100 532 Digital cellular telecommunications system (Phase 2+) (GSM); Support of Dual Tone Multi-Frequency signalling (DTMF) via the GSM system (GSM 03.14 version 6.0.0 Release 1997)
standard by European Telecommunications Standards Institute, 03/01/1999
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