
Private Integrated Services Network (PISN); Specification, functional model and information flows; Call offer supplementary service [ISO/IEC 14841 (1996) modified]
出版:European Telecommunications Standards Institute

专家解读视频
Private Integrated Services Network (PISN); Specification, functional model and information flows; Call offer supplementary service [ISO/IEC 14841 (1996) modified]
出版:European Telecommunications Standards Institute
专家解读视频