ETSI ETS 300 924-1999 数字蜂窝通信系统(第2+阶段).增强多级优先和先有权业务(eMLPP)-第1阶段.GSM02.67(第3版,版本5.1.1,1996年发布)
Digital Cellular Telecommunications System (Phase 2+); Enhanced Multi-Level Precedence and Pre-Emption Service (eMLPP) - Stage 1 Third Edition; GSM 02.67 Version 5.1.1 Release 1996