ETSI ETS 300 260-1996 专用综合业务网(PISN).规范,功能模型和信息流.呼叫转移补充业务.ISO/IEC 13865(1995),修正本(第2版)
Private Integrated Services Network (PISN); Specification, Functional Models and Information Flows; Call Transfer Supplementary Service ISO/IEC 13865 (1995), Modified Second Edition