ETSI PRETS 300 392-12-16-1996 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12部分:补充业务(SS)第3阶段.第12-16部分:置空优先呼叫(PPC)
Radio Equipment and System (RES); Trans-European (TETRA); Voice Plus Data (V+D); Part 12: Supplementary Services (SS) Stage 3; Part 12-16: Pre-Emptive Priority Call (PPC)