
PRIVATE TELECOMMUNICATIONS NETWORK (PTN) - SPECIFICATION, FUNCTIONAL MODELS AND INFORMATION FLOWS CALL COMPLETION SUPPLEMENTARY SERVICES
出版:European Telecommunications Standards Institute

專家解讀視頻
PRIVATE TELECOMMUNICATIONS NETWORK (PTN) - SPECIFICATION, FUNCTIONAL MODELS AND INFORMATION FLOWS CALL COMPLETION SUPPLEMENTARY SERVICES
出版:European Telecommunications Standards Institute
專家解讀視頻