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ETSI ETS 300 392-11-20
- Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 11: Supplementary services stage 2; Sub-part 20: Discreet Listening (DL)
- standard by European Telecommunications Standards Institute, 08/01/1999
- Publisher: ETSI
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To define the Stage 2 requirements for TETRA SS Discreet Listening