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ETSI TS 126 231
M00000632
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ETSI TS 126 231 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Cellular text telephone modem; Minimum performance requirements (3GPP TS 26.231 version 5.2.1 Release 5)
standard by European Telecommunications Standards Institute, 01/01/2005
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