DIN EN 300392-9-2008 地面中继无线电(TETRA).声音加数据(V+D).第9部分:附加业务的通用要求(认可英文版本EN 300392-9 V1.3.2 (2008-08)作为德国标准)
Terrestrial Trunked Radio (TETRA) - Voice plus Date (V+D) - Part 9: General requirements for supplementary services (Endorsement of the English version EN 300392-9 V1.3.2 (2008-08) as German standard)