DIN EN 300392-12-21:2005-04
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 V1.2.1 (2004-11) as German standard)
— 2 стр.
