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Business telephone system - Wikipedia

https://en.wikipedia.org/wiki/Private_branch_exchange
日付リンク: PBX  
2019-6-18 · A private branch exchange (PBX) is a telephone exchange or switching system that serves a private organization and permits sharing of central office trunks between internally installed telephones, and provides intercommunication between those internal telephones within the organization without the use of external lines. The central office lines provide connections to the public switched ...

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