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IP telephone apparatus and IP telephone system

Image Number 8 for United States Patent #7277530.

An IP telephone apparatus having a plurality of types of calling functions including a telephone calling function for telecommunicating via a telephone network and a network calling function for telecommunicating via a computer network. The IP telephone apparatus includes a calling function detection unit configured to detect which calling function of the telephone calling function and the network calling function is selected, and a calling function notification unit that notifies a user that at least one of general telephone using the telephone calling function and network telephone using the network calling function is being in operation according to a detection result of the calling function detection unit.

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