ETSI TS 124 091
- Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service - Stage 3 (3GPP TS 24.091 version 4.0.0 Release 4)
- standard by European Telecommunications Standards Institute, 03/01/2001
- Publisher: ETSI
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