Line selection method and line selection system for private branch exchanges

摘要

External lines 22 connected to a LAN 30 to establish pseudo private lines and having individual line numbers (for example, 5 and 3 ) are preliminarily assigned with the same identifier (for example, ID2). A sender PABX 10 transmits a call to a receiver PABX 10T and sends call information including ID2 of the line having the line number 5. The receiver PABX 10T acquires ID2 from the call information, selects the line having the line number 3 and assigned with ID2, and uses the line for communication. Between the two PABXs 10 and 10T, a combination of the lines having the line numbers 5 and 3 corresponding to ID2 can be fixedly used as the pseudo private line.