Importance

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Abstract

When an IBCF provided between different types of networks requests information of a receiver, the IBCF can notify a TrGW of call identification information. When the IBCF identifies a call from a log of the TrGW during checking of the log related to the call, the IBCF can use the call identification information. Therefore, the log can be efficiently checked. A session controller configured to connect to a plurality of communication networks of different types and perform a session control, and a transfer controller configured to connect to the plurality of communication networks and perform a packet signal transfer control, are provided. The session controller provides a termination information request message including call identification information for identifying a call included in a call connection request received by the session controller, to the transfer controller.

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First Claim