Abstract: When congestion occurs, the ENUM/DNS server can identify a priority packet without relaying on origin terminal information. An ENUM/DNS packet priority control system 100 includes a call control server 10 that, upon receiving a connection request from a terminal, determines whether or not the connection request is to be subjected to priority processing based on predetermined determination logic, and generates an ENUM/DNS packet that has a priority flag upon determining that the connection request is to be subjected to priority processing. The ENUM/DNS packet priority control system 100 also includes an ENUM/DNS server 20 that, upon receiving an ENUM/DNS packet that has the priority flag, determines that the packet is to be subjected to priority processing, and transmits, to the call control server 10, connection destination information that corresponds to the call destination terminal.

Abstract: A fraud damage prevention system (1000) includes a call processing server (20) and an ENUM/DNS server (10). The call processing server (20) includes: a fraud determination requesting unit that transmits a fraud number determination request, to which a call originating number of a call originating device (4) is affixed, to the ENUM/DNS server (10), and that receives the determination result as to whether or not the call originating number is a fraud number; and a fraud prevention processing unit that performs a predetermined fraud damage prevention process. The ENUM/DNS server (10) includes: a storage unit that stores fraud number information (100); and a fraud determination unit that references the fraud number information (100) using the call originating number, determines that the call originating number is a fraud number in the case where a number that is the same as the call originating number is registered, and transmits the determination result to the call processing server (20).

Abstract: When congestion occurs, the ENUM/DNS server can identify a priority packet without relaying on origin terminal information. An ENUM/DNS packet priority control system 100 includes a call control server 10 that, upon receiving a connection request from a terminal, determines whether or not the connection request is to be subjected to priority processing based on predetermined determination logic, and generates an ENUM/DNS packet that has a priority flag upon determining that the connection request is to be subjected to priority processing. The ENUM/DNS packet priority control system 100 also includes an ENUM/DNS server 20 that, upon receiving an ENUM/DNS packet that has the priority flag, determines that the packet is to be subjected to priority processing, and transmits, to the call control server 10, connection destination information that corresponds to the call destination terminal.