DIN EN 300392-12-13-2012 地面主干线广播(TETRA).语音加数据(V+D).第12部分:补充服务阶段3.第13子部分:完成对忙线用户的呼叫(CCBS)(英文版本EN 300 392-12-13 V1.2.1 (2012-03)的核准本作为德国标准)
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3 - Sub-part 13: Call Completion to Busy Subscriber (CCBS) (Endorsement of the English version EN 300 392-12-13 V1.2.1 (2012-03) as German standard)