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ETSI TS 123 014
M00001044
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ETSI TS 123 014 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Support of Dual Tone Multi Frequency (DTMF) signalling (3GPP TS 23.014 version 4.1.0 Release 4)
standard by European Telecommunications Standards Institute, 09/01/2002
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