| 摘要 |
A composite Internet phone device is provided, which is a phone device formed by compositing an Internet phone module with a conventional phone, and used for communication service of voice over Internet Protocol (VOIP) and public switched telephone network (PSTN), wherein it is selectively switched to one of the VOIP and PSTN by a switching unit according to power supplying conditions of a power-supplying device for an Internet phone or networks of the called party and the calling party.
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