DIN EN 300392-12-20:2012-12
Действует
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3 - Sub-part 20: Discreet Listening (DL) (Endorsement of the English version EN 300 392-12-20 V1.2.1 (2012-04) as German standard)
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