DIN ETS 300392-12-20:2000-05
Отменен
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 ETS 300392-12-20:1999 as German standard)
