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ETSI TS 123 091
M00001182
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ETSI TS 123 091 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) Supplementary Service; Stage 2 (3GPP TS 23.091 version 5.1.0 Release 5)
standard by European Telecommunications Standards Institute, 09/01/2002
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