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ETSI TS 123 091
M00001183
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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 4.1.0 Release 4)
standard by European Telecommunications Standards Institute, 09/01/2002
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