ETSI TS 122 004

ETSI TS 122 004
ETSI TS 122 004 English PDF Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); General on supplementary services (3GPP TS 22.004 version 4.0.0 Release 4)

standard published 03/01/2001 by European Telecommunications Standards Institute

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