Hitachi, Ltd.

Kazuhiro Kita

Tomohide Sugimoto

Makoto Hirayama

In executing a setup procedure of a call from a VoIP gateway on the originating side to a media gateway on the destination side via a gate keeper, an authentication key is transmitted from the gate keeper to the VoIP gateway and the media gateway. The VoIP gateway on the originating side transmits to the media gateway on the destination side an admissions confirm (ACF) after attaching the authentication key. Then, the media gateway collates the authentication key obtained from the originator VoIP gateway with the authentication key obtained from the gate keeper and continues the call setup procedure only when the two authentication keys coincide with each other. On the other hand, in case of non-coincidence, the gate keeper carries out a call release. Through this, an illegal connection call not routing through the gate keeper is excluded without fail.

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Yokohama, Japan

Kazuhiro Kita