JPH11243444A - Calling telephone number display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect the privacy of originator and to enable the police and a telephone service company to decode a cipher so as to detect an originator, where a receiver suffers from a criminal act by enciphering and displaying a calling telephone number entirely or partially, on a called side telephone number displaying device. SOLUTION: A calling side subscriber line exchange 12 sends calling telephone number data with an address massage including it to a called side subscriber line exchange 13 via a common line signal network. It is to a telephone number enciphering device 16, to which is a cipher storage device 15 is connected, via a common line signal device 138 an a call control processor 137, the four lower digits of the calling telephone number data are converted into implication based on a conversion character table that has been stored preliminarily in the device 15, enciphered data is sent to a calling telephone number transmitting device, it is made a signal form that can be received by a called side, it is sent to a called side telephone set 10 via a subscriber line 131 and the enciphered data is shown here. Here, the conversion charter table is stored by a telephone service company, etc., and the cipher is decoded by it when necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for displaying an outgoing telephone number on a display device of a telephone having a function of displaying an outgoing telephone number on a receiving side or a telephone number display device used by connecting to the receiving telephone during a call. It is about.

[0002]

2. Description of the Related Art In the United States, a service for displaying a calling telephone number on a called telephone has been started about ten years ago, and a similar service has recently been started in Japan, and is going to spread widely in the future.

[0003] The current calling telephone number display is provided as a basic service on the ISDN line. The analog telephone line is realized by the subscriber signing a contract and connecting to the called telephone by connecting the calling telephone number display device to the telephone, or by installing a telephone with a calling telephone number display function. I have.

[0004] In a telecommunications network, a number of subscriber line exchanges and trunk line exchanges are arranged and connected to each other by trunk lines to form a network. Many telephones are connected to the local exchange. Each exchange is connected to a communication line for transmitting and receiving call sounds as electric signals and a signal line for signals such as dial signals transmitted between the exchanges. This signal line uses a common line signal system, and signals for a plurality of communication lines can be transmitted and received through a signal dedicated line. Such signal lines are interconnected to form a common line signal network.

The actual calling telephone number is displayed as follows. When the originating subscriber raises the handset, the subscriber line is connected to the originating local exchange. If the called subscriber's telephone number is entered using the numeric keypad of the calling telephone, the subscriber line exchange accommodating the calling subscriber and the subscriber exchange accommodating the called subscriber are connected by a trunk line to form a communication path. At this time, the telephone number data of the caller is transmitted from the originating local exchange to the destination local exchange through the common channel signaling network in a form included in the address message (IAM). The terminating local exchange sends the calling telephone number data to the called telephone. The data is displayed on the telephone with the telephone number display function on the called side or on the telephone number display device connected to the called side telephone.

The technology of the calling telephone number display service is described in NTT Technical Journal, No. 11, 1996, and Nikkei Communication, No. 3.17, 1997.

[0007]

In the conventional service,
The caller can select whether to notify or not notify the called party of the calling telephone number. Therefore, when the caller selects non-notification in a silent or mischievous call by a criminal such as a stalker, the caller is not known who the caller is. From the standpoint of crime prevention, it is desirable to always notify the called party of all outgoing telephone numbers and display them on the called telephone.

On the other hand, from the viewpoint of privacy protection, it may not be preferable for personal information to be known to the called party on the receiving side. If an incorrect call is made and the called party knows the caller's telephone number, a problem occurs.
Also, for example, when a general consumer calls a company for product inquiries, etc., the individual's telephone number is posted on the general company's customer list without knowing it, and there is a concern that it may be used to pursue corporate profits .

[0009]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides a telephone having a telephone number display function on the receiving side.
Alternatively, all or part of the outgoing telephone number is encrypted and displayed on a telephone number display device connected to the receiving telephone.

[0010]

According to the present invention, the telephone number of the caller is encrypted and displayed on the display device of the called telephone or on the telephone number display device connected to the called telephone. The number cannot be known by the called party, and the privacy of the calling party is protected. However, once a victim of a criminal act such as a mischievous phone call, the police and telephone service companies can detect the sender of the encrypted telephone number at a later date based on the damage report submitted to the police. It has the effect of being secured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below using a communication network similar to that used for the current telephone number display service.
It is assumed that the telephone has a display function capable of displaying alphabets other than numbers and the like. FIG. 1 is an external view of a telephone with a display function for displaying an encrypted calling telephone number, and FIG. 2 is a block diagram of the telephone with a display function according to the present invention. As the subscriber line exchange, an exchange having the same function as the D70 type digital exchange is assumed. FIG. 3 shows an embodiment of a communication network to which the calling telephone number display system of the present invention is applied.

A calling telephone 9 is connected to the calling subscriber line. The receiving-side telephone exchange 10 is connected to the receiving-side telephone 10 via a subscriber line. The originating local exchange 12 and the receiving local exchange 13 are connected to a telephone network and a common signaling network.

In the embodiment, "012-345-67"
The telephone having the telephone number of "89" becomes the caller, the lower four digits of the telephone number of the transmitting side are encrypted by the receiving local exchange 13, and the calling telephone of the receiving side having the telephone number of "987-654-3210" A case where the telephone number of the caller is displayed on the telephone 10 with a number display function will be described.

The calling subscriber raises the handset 2 and inputs the desired telephone number "987-654-3210" by pressing the numeric key 4. This "987
"654-3210", the originating subscriber's line switch 12
Transmits the outgoing telephone number data "012-345-6789" to the nearest subscriber line exchange 13 nearest to the receiving side through the common line signaling network in a form included in the address message.

The outgoing telephone number data that has arrived at the destination local exchange 13 passes through the common line signaling device 138 and the call control processor 137 and enters the telephone number encrypting device 16. The encryption storage device 15 is connected to the telephone number encryption device 16. Based on a predetermined substitution table as shown in FIG. 4, for example, stored in the storage device, the telephone number encryption device 16 converts the lower four digits into corresponding dark characters. The encrypted “012-345”
EDFEBEAF "is transmitted to the calling telephone number transmitting device 17. Here, the calling telephone number is converted into a signal format that can be received by the receiving telephone, and transmitted to the receiving telephone 10 through the subscriber circuit 131.
In the receiving-side telephone 10, "012-3" is displayed on the display device 3 in the same manner as the current calling telephone number service.
45-EDFEBEAF ".

It is desirable that this cipher table is strictly stored in a telephone service company or the like. Further, in order to prevent a trouble caused by a general telephone user decrypting the cipher, use a higher cipher than described in the embodiment or use a cipher table within a range that can be displayed on the called telephone. It may be changed at regular intervals. Further, in the present embodiment, the alphabetic code is used. However, a code using other easily recognizable symbols such as kanji and kana characters may be used.

[0017]

When the last four digits of the telephone number are encrypted as in the above-described embodiment of the present invention, the toll number is correctly displayed on the display device of the called telephone. A person who receives a suspicious call, such as, can directly know in which area the suspicious call is from. If there is a large number of suspicious calls, it is possible to know whether the same person has repeatedly called by comparing all the digits of the telephone number including the last four digits of the encrypted portion. In addition, those who have been affected by the suspicious phone call record the phone number including the encrypted part of the caller and submit a damage report to the police station at a later date, so that the police and telephone service companies etc. Has the effect of giving important clues in investigating based on
It becomes easy to specify the suspicious caller such as a stalker.

Similarly, when all the digits of the outgoing telephone number are encrypted, if there are many suspicious calls, record the encrypted telephone number and compare all the digits of the telephone number. Thereby, it is possible to know whether the same person is calling repeatedly. In addition, the victims of the suspicious phone call record the encrypted telephone number of the caller, and submit a report of the damage to the police station at a later date. This has the effect of giving clues, and makes it easier to identify the suspicious caller such as a stalker.

On the other hand, even if the calling telephone number is notified to the receiving side by adopting the calling telephone number encryption method, part or all of the telephone number of the caller is not directly known to the receiving side, and it is strict. The cipher table managed by the public is not publicly known, and the privacy of the caller is protected.

In this embodiment, the case where a telephone with a display function is used as the receiving telephone is described, but the same effect can be obtained when a telephone number display device is connected to the receiving telephone.

[Brief description of the drawings]

FIG. 1 is an external view of a telephone with a display function.

FIG. 2 is a block diagram of a telephone with a display function.

FIG. 3 is a diagram of a communication network to which the calling telephone number display method of the present invention is applied.

FIG. 4 is a substitution table used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telephone with a display function 2 Handset 3 Display device 4 Numeric keypad 5 Talk part 6 Line control part 7 CPU 8 Memory 9 Originating telephone 10 Receiving telephone 11 Communication line 12 Originating local exchange 13 Receiving local exchange 14 Common Line signal line 15 Encryption storage device 16 Encryption device 17 Encryption transmission device 121, 131 Subscriber circuit 122, 132 Concentrator / multiplexer (LC / MUX) 123, 133 Time division communication path (TDNW) 124, 134 Subscriber line signal processing Equipment (LNP) 125, 135 Communication path controller (SWC) 126, 136 Switch storage (EM) 127, 137 Call control processor (CNP) 128, 138 Common line signaling device (CSE)

Claims (4)

[Claims] 1. A method for displaying a calling telephone number in a telephone having a calling telephone number display function on a receiving side, wherein all digits of the telephone number are encrypted and displayed. 2. A method for displaying an outgoing telephone number in a telephone having a function of displaying an outgoing telephone number on a receiving side, wherein a part of digits of the telephone number is encrypted and displayed. 3. A method for displaying a calling telephone number in a telephone number display device used by connecting to a receiving telephone, wherein all digits of the telephone number are encrypted and displayed. 4. A method for displaying a calling telephone number in a telephone number display device used by connecting to a receiving telephone, wherein a part of digits of the telephone number is encrypted and displayed.