COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND CALL CONTROL SERVER

摘要

A first call control server transmits line information of a line to be used by a terminal device calls of which are controlled by the first call control server to a second call control server when congestion is detected. The first call control server receives the line information to be used in call control from the second call control server, and establishes a connection with the terminal device using the received line information. The second call control server receives the line information from the first call control server, and receives a call control request for the terminal device, the call control request being addressed to the first call control server. The second call control server responds to the first call control server with the received line information, when the call control request is received.

主权项

1. A communication system comprising:
a first call control server; and a second call control server, the first call control server comprising:
a transmitting unit that transmits line information related to a communication line to be used by a terminal device calls of which are controlled by the first call control server to the second call control server when congestion is detected; anda connecting unit that receives the line information to be used in call control from the second call control server, and establishes a connection with the terminal device using the received line information, and the second call control server comprising:
a first receiving unit that receives the line information from the first call control server;a second receiving unit that receives a call control request for the terminal device, the call control request being addressed to the first call control server; anda responding unit that responds the first call control server with the line information received by the first receiving unit, when the second receiving unit receives the call control request.