ETSI EN 300 953

ETSI EN 300 953
ETSI EN 300 953 English PDF Digital cellular telecommunications system (Phase 2+) (GSM); Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 3 (GSM 04.83 version 6.0.1 Release 1997)

standard published 09/01/1999 by European Telecommunications Standards Institute

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