| 摘要 |
A gateway device is set to the doubled construction of the media gateway of the normal operation and the media gateway for redundancy. When a device failure is generated in the above media gateway of the normal operation, a signal path is controlled so as to be switched to the media gateway for redundancy by a switching unit. The IP address and the MAC address possessed in the above media gateway of the normal operation are transferred to the media gateway for redundancy simultaneously with the switching from the above media gateway of the normal operation to the media gateway for redundancy.
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