ETSI TS 101 637

ETSI TS 101 637
ETSI TS 101 637 English PDF Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 2 (GSM 03.91 version 7.0.0 Release 1998)

standard published 08/01/1999 by European Telecommunications Standards Institute

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