
Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call intrusion supplementary service [ISO/IEC 14846 (1996), modified]
出版:European Telecommunications Standards Institute

专家解读视频
Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call intrusion supplementary service [ISO/IEC 14846 (1996), modified]
出版:European Telecommunications Standards Institute
专家解读视频