| 摘要 |
According to one embodiment of the invention, there is provided a telephone system comprises gateways used to convert each other's protocols of IP network and PSTN. One of the gateways selectively serves as a main gateway, and the other gateways serve as slave gateways controlled by main gateway. Each of gateways includes a control channel manager, an operation controller and a determination module. Control channel manager of the main gateway controls speech data individually sent and received by gateways, based on a control signal of a control channel of PSTN. Operation controller controls redundancy switching between the plurality of gateways upon occurrence of a fault. Determination module determines whether the fault is associated with control channel. When the fault is associated with control channel, determination module notifies a slave gateway of message used to activate control channel manager of the slave gateway via IP network.
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