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New ETSI ETS 300 544 View larger

ETSI ETS 300 544

M00000528

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ETSI ETS 300 544 European digital cellular telecommunications system (Phase 2); Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 2 (GSM 03.83)

standard by European Telecommunications Standards Institute, 11/01/1994

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