ETSI TR 129 998-4-4-2007 3GPP TR 29.998-04-4 V7.0.0:通用移动通信系统(UMTS),开放业务接入(OSA)的应用编程接口(API)映射.第4部分:呼叫控制业务映射.第4小部分:多方呼叫控制ISC
Universal Mobile Telecommunications System (UMTS); Open Service Access (OSA) Application Programming Interface (API) Mapping for Open Service Access; Part 4: Call Control Service Mapping; Subpart 4: Multiparty Call Control ISC V7.0.0;3GPP TR 29.998-04-4