DIN ETS 300392-4-1:1999 地面主干线广播.语音加数据.第4部分:网关基本操作.第1子部分:公共开关电话网 (英文版本核准本 ETS 300392-4-1:1999 作为德国标准)
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 4: Gateways basic operation; Sub-part 1: Public Switched Telephone Network (PSTN) (Endorsement of the English version ETS 300392-4-1:1999 as German standard)