DIN ETS 300392-10-23-2000 地面主干线广播(TETRA).语音加数据(V+D).第10部分:补充服务1级.第23分部分:无应答的呼叫结束 (英文版本核准本 ETS 300392-10-23:1999 作为德国标准)
Terristrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 10: Supplementary services stage 1; Sub-part 23: Call completion on no reply (Endorsement of the English version ETS 300392-10-23:1999 as German standard)
The document describes the supplementary service that enables a calling user A, encountering a user B, that does not answer, to have completed when user B is available, without having to make a new call attempt.