
Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call offer supplementary service [ISO/IEC 14843 (1996), modified]
出版:European Telecommunications Standards Institute

專家解讀視頻
Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call offer supplementary service [ISO/IEC 14843 (1996), modified]
出版:European Telecommunications Standards Institute
專家解讀視頻