ETSI PRETS 300 392-11-16-1996 无线电设备和系统(RES).泛欧集群无线电(TETRA).语音加数据(V+D).第11部分:补充业务(SS)第2阶段.第11-16部分:置空优先呼叫(PPC)
Radio Equipment and Systems (RES); Trans-European Trunked Radio (TETRA); Voice Plus Data (V+D); Part 11: Supplementary Service (SS) Stage 2; Part 11-16: Pre-Emptive Priority Call (PPC)