US 7,983,405 B2 · Line selection method and line selection system for private branch exchanges

Abstract

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.

Claims4

Dependent claims

A line selection method for a plurality of private branch exchanges connected to one another via a network and network lines connected between the private branch exchanges and the network,

wherein every pair of the private branch exchanges are preliminary provided with line information tables to assign a same identifier to their respective network lines connected to the network to form a pseudo private line by a combination of these network lines, one of the private branch exchanges as a sender sending the identifier upon call transmission, the other private branch exchange as a receiver selecting the network line assigned with the identifier sent from the sender and using the network line for communication.

Dependencies are inferred from the claim text.

Line selection method and line selection system for private branch exchanges

Life of this patent

Line selection method and line selection system for private branch exchanges

Life of this patent

Abstract

Claims4