DIN EN 300392-12-21:2011-08
Отменен
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3 - Sub-part 21: Ambience Listening (AL) (Endorsement of the English version EN 300392-12-21 V1.4.1 (2011-04) as German standard)
— 2 стр.
