
Private Telecommunication Network (Ptn) - Specification, Functional Model And Information Flows - Do Not Disturb And Do Not Disturb Override Supplementary Services
出版:Polish Committee for Standardization

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Private Telecommunication Network (Ptn) - Specification, Functional Model And Information Flows - Do Not Disturb And Do Not Disturb Override Supplementary Services
出版:Polish Committee for Standardization
專家解讀視頻