Nec Corporation

Kazuhiro Azuma

Masayuki Yamada

Toshikazu Maruyama

Kazuhiro Mose

A data communication system includes a server, data link started side apparatus, data link starting side apparatus, and originating server. The server provides a service through a network. The data link started side apparatus performs line control between itself and the line connection destination, and performs LAN control between itself and the server through the network, thereby relaying packets between the line connection destination and the server. The data link starting side apparatus is connected to the data link started side apparatus, disconnects the line between itself and the data link started side apparatus on the basis of an MITF dial-up dormant protocol when there is no communication between itself and the server for a predetermined period of time, and shifts to a dormant state. The originating server originates data reception notification by using the originating telephone number transmitted from the data link started side apparatus when a packet communication state between the data link starting side apparatus and the data link started side apparatus is in the dormant state, and the data link started side apparatus receives data addressed to the data link starting side apparatus from the server. A data communication method and a server are also disclosed.

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Tokyo, Japan

Kazuhiro Azuma