ETSI TS 132 272-2007 数字蜂窝通信系统(第2+阶段).全球移动通信系统(UMTS).通信管理.计费管理.手机即按即说(PoC)的计费(版本7.4.0).3GPP TS 32.272(版本7.4.0,第7次发布)
Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Telecommunication management; Charging management; Push-to-talk over Cellular (PoC) charging V7.4.0; 3GPP TS 32.272 version 7.4.0 Release 7