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ETSI TS 126 231
M00000631
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ETSI TS 126 231 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Global text telephony (GTT); Cellular text telephone modem minimum performance requirements (3GPP TS 26.231 version 6.0.2 Release 6)
standard by European Telecommunications Standards Institute, 01/01/2005
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