CLOUD SWITCHING SYSTEM, GATEWAY DEVICE AND GATEWAY PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a cloud switching system which can use an SIP server, having a PBX function, selected from the unspecified number of commercial products.SOLUTION: A cloud switching system 1 includes: an IP telephone network 40; an SIP terminal 10 connected to the IP telephone network 40 through a user side gateway device 30; the user side gateway device 30 which converts an SIP method output from the SIP terminal 10 so as to enable passing through the IP telephone network 40; a switching system side gateway device 50, connected to the IP telephone network 40, to convert the SIP method input from the IP telephone network 40 so as to enable reception by a private telephone exchange SIP server 60; and the private telephone exchange SIP server 60 connected to the switching system side gateway device 50.SELECTED DRAWING: Figure 1