
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

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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
專家解讀視頻