JP2578922B2 - Confirmation method of device identification number of communication terminal device by encryption - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a public communication network, a communication terminal device directly or indirectly connected to the public communication network, and a private branch exchange network other than the above. The present invention relates to a method for confirming a device recognition code of a communication terminal device by encryption for use with a terminal device to be used.

[Conventional technology]

Conventionally, the public communication network side uses the device identification number of
When it is necessary to know the ID, etc., the information used inside the public communication network is used. The information in the public communication network is information at the time of terminal device registration, and is managed on a line basis. Therefore, when a plurality of terminal devices are connected to the same line, each terminal device is not identified. Fees are handled on a line-by-line basis, and no distinction is made from which terminal device on the same line originated the call.

[Problems to be solved by the invention]

As described above, if the information relies only on information in the public communication network, it is impossible for the public communication network to immediately know the movement or change of the terminal device between lines.

Further, when a plurality of terminal devices are connected to one line, there is a possibility that an inappropriate terminal device for charging is connected to the line depending on the type of service.

Similarly, when a plurality of terminal devices are connected to one line, it is difficult to perform communication by designating only specific terminal devices. In addition, the above-described problem occurs because the terminal device cannot perform terminal identification because the terminal device itself does not transmit identification information.

Further, since the communication line maintains the connection even if it is disconnected, it is possible to instantaneously switch the terminal connected to the communication circuit and continue the communication. For example, public telephone A
Is called and is connected to the exchange, the public telephone A is disconnected momentarily and the telephone is switched to the normal telephone B, and thereafter the public telephone A remains disconnected. Therefore, the subtraction of the telephone card and the storage of the coin are not performed. That is, even if the terminal is recognized as valid at the time of calling, there is no guarantee that the validity will be maintained thereafter.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to transmit an encrypted ID from a terminal device, receive and analyze the ID on a public communication network side, and determine whether or not to provide a service. Accordingly, it is an object of the present invention to provide a method for confirming a device identification number of a communication terminal device by encryption which enables various services.

[Means for solving the problem]

The method for confirming the device identification number of a communication terminal device by encryption according to the present invention transmits the device identification number encrypted from the terminal device to the public communication network side at a predetermined period from origination to line disconnection. The public communication network receives the device identification number from the terminal device, identifies the terminal device by comparing it with its own data, and determines whether or not to provide the service.

[Action]

According to the present invention, a device identification number is transmitted from a terminal device to the public communication network side, and the public communication network collates the data with its own data to determine whether the terminal device is permitted to provide a service.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a connection relationship between a public communication network and a terminal device and an outline of an ID transmission / reception operation for explaining an embodiment of the present invention, and FIG. 2 is a flowchart showing a connection operation according to the present invention. . Hereinafter, the operation of the embodiment of FIG. 1 will be described with reference to FIG. In addition, (1) to (12) of FIG. 2 show each step.

In FIG. 1, I indicates a public communication network side, II indicates a terminal device side, III indicates a line, and A to D indicate telephones.

When the caller raises the receiver and makes a call request to the public communication network I (1), the public communication network I prepares for ID reception (2) and issues an ID request signal. Telephone A of terminal equipment side II
Sends the encrypted ID to the public communication network side I (3). The public communication network side I refers to the ID and determines whether or not the terminal device permits outgoing call (4). (5). If acceptable, the caller is a dial tone (DT)
Is confirmed (6), turn the dial and send the dialed number (7). In the case of non-permission, the public communication network side I does not accept even if dialing. The device on the public communication network side I establishes a connection by dial numbers (8), and enters a call state.

The telephone A automatically sends out the encrypted ID at a fixed period during a call (9), and the public communication network I sends the encrypted ID.
The ID is determined (10), and the call is continued if the call is still permitted, or disconnected if not permitted. If the call is cut off on the public communication network side I, the call is cut off and ended (11).

If the caller continues the call, this operation is repeated ((9) to (12)), and if the call is stopped, the call is terminated. Confirm and exit.

When it is desired to allow only one of a plurality of telephones A to D connected to the same line III, a plurality of telephones A to D are conventionally connected to one line as shown in FIG. It is assumed that A is a telephone that can make a call and B and C are telephones that do not want to make a call.

Conventionally, in order to perform the above, a method has been adopted in which the telephones B and C are modified so that transmission is not possible. However, if a telephone D which is not modified (can transmit) is connected to the telephone line of the telephone C. In this case, it becomes possible to make a call from the telephone D. However, such a disadvantage does not occur if the present invention is used.

It should be noted that in the above-described embodiment, various known encryption means can be employed, and thus the details thereof will be omitted. Also, when sending an encrypted ID, even if it is encrypted, there is a risk of eavesdropping that it is always the same,
In order to prevent this, it is effective to randomly change each time a call is made. For example, the ID may be modulated according to a command from the public communication network I.

〔The invention's effect〕

As described above, the present invention transmits an encrypted device identification number from a terminal device to the public communication network at least at the time of calling, while receiving the device identification number from the terminal device on the public communication network side. Since the terminal device is identified by comparing it with its own data to determine whether to provide the service, a specific terminal device can be identified from among a plurality of terminal devices connected to the same communication line. Can be specified individually. By using such an individual designation function, more various services than before can be provided. Also, since the device identification number is transmitted at a predetermined cycle not only at the time of outgoing call but also from the time of outgoing call to line disconnection, service is provided immediately even if switching to another terminal device due to instantaneous line disconnection. Can be cut. Therefore, the present invention is important for realizing a system that handles expensive money, such as firm banking using an IC card telephone, without preventing the unauthorized use of communication lines and the inability to collect call charges. It is something. Further, the unique information of the connection terminal is not eavesdropped on the line, and the validity of the connection terminal can be confirmed even while the line is being used. There is an advantage that an unauthorized terminal device can be detected.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection relationship between a public communication network and a terminal device for explaining an embodiment of the present invention, and an outline of an ID transmitting / receiving operation. FIG. 2 is a flowchart of a connecting operation according to the present invention. FIG. 3 is a diagram showing a connection relationship between a public communication network and a terminal device for explaining a conventional connection method. In the figure, I is a public communication network side, II is a terminal device side, III is a line, and A to D are telephones.

Claims (1)

(57) [Claims] 1. A terminal device connected to a public communication network, wherein an encrypted device identification number is transmitted from the terminal device to the public communication network at a predetermined period from transmission to disconnection of a line, On the other hand, the public communication network receives a device identification number from the terminal device, identifies the terminal device by comparing it with its own data, and determines whether to permit or deny service provision. How to confirm the device identification number of the communication terminal device according to.