• ETSI ETS 300 544
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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
  • Publisher: ETSI

$19.00$37.00


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