| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system for collectively managing subscriber information, capable of handling against attacks more efficiently.SOLUTION: In a communication system, a call connection device 2A-2C, when it is attacked, transmits a notification informing occurrence of an attack, in which attacker information is included, to a subscriber information management device 1. When the subscriber information management device 1 receives the notification informing occurrence of the attack, the subscriber information management device 1 responds to the notification of the attack by sending a signal that includes the attacker information and a lockout instruction to other call connection devices 2A-2C which in turn perform lockout procedures. Thus, when one of the call connection devices 2A-2C is attacked, the system can simultaneously cope with attacks by the same attacker against other call connection devices 2A-2C, resulting in more efficient handling against attacks. |
