ETSI ETS 300 392-12-21
- Draft Edition 1Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 12: Supplementary services stage 3; Sub-part 21: Ambience Listening (AL)
- standard by European Telecommunications Standards Institute, 09/01/1996
- Publisher: ETSI
$21.00$41.00
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