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ÖNORM ETS 300392-12-20:1999-11

Заменен
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3 - Sub-part 20: Discreet Listening (DL)
ICS
33.070.10 Terrestrial Trunked Radio (TETRA) / Стандарт на мобильную связь (TETRA)