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NBN EN 300 392 11-12 : 2003
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The latest, up-to-date edition.
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TERRESTRIAL TRUNKED RADIO (TETRA) - VOICE PLUS DATA (V+D) - PART 11: SUPPLEMENTARY SERVICES STAGE 2 - SUB-PART 12: CALL HOLD (CH)
Published date
12-01-2013
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