Importance

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Abstract

This invention is to provide a telephone exchange capable of operating any one of the juxtaposed and registered extension radiotelephones and wire telephones by only specifying one extension dial number. For this purpose, a wire port physical number is registered in association with a radio port physical number so that two normally separate extension wire telephone (006a, 006b, . . . ) and radiotelephone (008a, 008b, . . . ) can be handled as if they were a single-channel extension phone with a branch switch. Thus, when the user handles two separate radio telephone and wire telephone, the call to the wire telephone can be transferred to the radiotelephone by a simple operation. When the user leaves his desk on which the wire telephone is installed, carrying the radiotelephone with him, it can be carried to a long distance. In addition, two telephones can be used as if they are connected in parallel, and for example, the telephone conversation between a main line and the radiotelephone can be transferred to the wire telephone.

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First Claim