Radio telephone device capable of identifying an interrupting caller and telephone system using the same

Claim 2

A telephone system comprising: a control terminal having an exchanging function; a plurality of mobile telephone switching offices connected to the control terminal; a plurality of base stations each connected to one of the mobile telephone switching offices; a plurality of radio telephone sets, each having a display unit and an assigned telephone number, each to be connected to one of the mobile telephone switching offices via a radio channel and operable for sending a call signal including the assigned telephone number; wherein the control terminal includes: means for controlling a connection between a first radio telephone set and a second radio telephone set, means for receiving an interrupting call signal from a third radio telephone set directed to the first radio telephone set during the connection between the first radio telephone set and the second radio telephone set, means for detecting a telephone number of the third radio telephone set included in the interrupting call signal, and means for transmitting the detected telephone number to the mobile telephone switching office which controls the first radio telephone set, wherein each of the mobile telephone switching offices include: means for detecting the assigned telephone number of the third radio telephone set, and means for generating control information including the detected telephone number, wherein each of the base stations include means for sending the control information to the first radio telephone set, and wherein the first radio telephone set includes means for detecting the assigned telephone number of the third radio telephone set in the control information and means for displaying the detected telephone number on the display unit of the first radio telephone set.

Claim 3

A telephone system comprising: a plurality of radio telephone sets; a plurality of mobile telephone switching offices to be connected to the radio telephone sets through radio channels; and a control terminal for controlling connection among the radio telephone sets via the mobile telephone switching offices; wherein the control terminal includes: means for controlling a connection between a first radio telephone set and a second radio telephone set; means for receiving an interrupting call signal from a third radio telephone set directed to the first radio telephone set during the connection between the first radio telephone set and the second radio telephone set, the interrupting call signal including identification information of the third radio telephone set; means for detecting the identification information of the third radio telephone set from the interrupting call signal; and means for transmitting the detected identification information to a mobile telephone switching office which controls the first radio telephone set; wherein the mobile telephone switching offices each include: means for receiving the identification information transmitted from the control terminal; means for generating a control signal which includes the identification information of the third radio telephone set transmitted from the control terminal; and means for transmitting the control signal to the first radio telephone set; and wherein the first radio telephone set includes: means for receiving the control signal transmitted from the mobile telephone switching office which controls the first radio telephone set during the connection with the second radio telephone set; means for detecting the identification information of the third radio telephone set from the control signal; and means for informing a user of the first radio telephone set of the identification information of the third radio telephone set.

Claim 4

A telephone system comprising: a plurality of radio telephone sets; a plurality of mobile telephone switching offices to be connected to the radio telephone sets through radio channels; and a control terminal for controlling connection among the radio telephone sets via the mobile telephone switching offices; wherein the control terminal includes: means for controlling a connection between a first radio telephone set and a second radio telephone set; means for receiving an interrupting call signal from a third radio telephone set directed to the first radio telephone set during the connection between the first radio telephone set and the second radio telephone set, the interrupting call signal including identification information of the third radio telephone set; means for detecting the identification information of the third radio telephone set from the interrupting call signal; and means for transmitting the detected identification information to a mobile telephone switching office which controls the first radio telephone set; wherein the mobile telephone switching offices each include: means for receiving the identification information transmitted from the control terminal; means for generating a control signal which includes the identification information of the third radio telephone set transmitted from the control terminal; and means for transmitting the control signal to the first radio telephone set; and wherein the first radio telephone set includes: means for receiving the control signal transmitted from the mobile telephone switching office which controls the first radio telephone set during the connection with the second radio telephone set; means for detecting the identification information of the third radio telephone set from the control signal; and means for informing a user of the first radio telephone set of the identification information of the third radio telephone set.