| 摘要 |
There is provided a call control system, a call controller, a terminal device, and a call control method of this type, whereby a communication network to be used by a terminal device on the receiving side is determined in an efficient manner to allow communication promptly, in a communication where plural communication networks are selectively used. On receipt of a reception request from the terminal device 220 on the receiving side, call control signals are concurrently transmitted, each having a call identifier for identifying a call to the plurality of communication networks, respectively, estimated to be available to the terminal device on the receiving side, based upon the available network data held by the holding, and upon receipt of each of call responses to the call control signals concurrently transmitted, from each of the plurality of communication networks, a communication network to be used by the terminal device on the receiving side is determined based upon call control condition information representing a condition relating to the call control and communication resource information included in a single call response received in a relatively early order.
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