
Private Telecommunication Network (ptn) - Specification, Functional Model And Information Flows - Do Not Disturb And Do Not Disturb Override Supplementary Service
出版:European Telecommunications Standards Institute

专家解读视频
Private Telecommunication Network (ptn) - Specification, Functional Model And Information Flows - Do Not Disturb And Do Not Disturb Override Supplementary Service
出版:European Telecommunications Standards Institute
专家解读视频