KR100258639B1 - Public telephone veriging system and the method therefor - Google Patents

Abstract

PURPOSE: A system for verifying a public telephone and a control method thereof are provided to mount a line monitoring control unit between a main distributing frame between a public telephone line, and to generate specific information during speech, then to modulate the information to a frequency in an inaudible band for transceiving with the public telephone. CONSTITUTION: A line monitoring control unit(300) generates specific information using a frequency in an inaudible band during speech, and transmits the information to a public telephone(100) to receive response information from the public telephone(100) for analysis. If the information is incapable of being verified, the line monitoring control unit(300) forcibly disconnects a corresponding telephone line call, to limit illegal speech. The public telephone(100) analyzes the information received from the line monitoring control unit(300), and generates an authentication value capable of being verified for transmission to the line monitoring control unit(300). A telephone line(200) forms a speech path between the line monitoring control unit(300) and the public telephone(100). And a main distributing frame(400) accepts a telephone line(200) from external of a telephone station by passing the line monitoring control unit(300), in order to form a speech path between an exchange of the telephone station and the public telephone(100).

Description

Public telephone verification system and control method

1 is a block diagram showing the overall configuration for implementing a public telephone verification system according to the present invention.

2 is a block diagram showing the detailed configuration of the public telephone of FIG.

3 is a block diagram showing the detailed configuration of the track monitoring control device of FIG.

4 is a detailed flowchart for implementing the line monitoring control device of FIG.

* Explanation of symbols for main parts of the drawings

100: public telephone 200: telephone line

300: line monitoring control device 400: main wiring board

110: telephone control circuit 120: line interface

130: code analysis controller 310: line detection unit

320: frequency modulation and demodulation unit 330: line control relay

340: line control unit 350: signal period setting unit

The present invention relates to a public telephone verification system and a method of controlling the same. More specifically, in order to make a call in an illegal manner, the telephone line is deliberately disconnected from the public telephone, and an arbitrary ordinary telephone is connected to the telephone line to attempt a call. The present invention relates to a public telephone verification system and a method of controlling the same, which prevents attempts to make a fraudulent call without paying a call fee by attempting a parallel connection of a general telephone to a telephone line to which a public telephone is connected.

In addition to the innovative development of the telecommunications industry, the number of public telephones is increasing, and various products are provided from unmanned public telephones to self-sufficient public telephones purchased and managed by individuals in general businesses.

All of these public phones are used to pay the call fee in advance, and when a certain amount is paid to the public phone to make a call, the public phone is automatically connected to the call line so that the call can be made.

As described above, although public telephones must be able to make calls only by paying call charges, public telephone lines are exposed to the possibility of theft.

For example, even if you do not use a public telephone, you can cut a telephone line connected to a public telephone and connect a general home telephone to the telephone line. Because it is possible, anyone can make free calls in this wrong way.

If a public telephone set up for commercial purposes does not pay a fair call rate and calls in such a fraudulent manner, the public telephone company will inevitably suffer huge damages, and this may lead to disputes with the telephone company in the settlement of the call rate. Will not be able to escape.

Accordingly, an object of the present invention is to provide a line monitoring control device between a public telephone line introduced into a telephone station and a main wiring board accommodated in the telephone station, and generate specific information during a call. This is to control the availability of telephone lines by analyzing whether public telephones that can be verified by performing transmission and reception with public telephones by modulating to the frequency are used. An object of the present invention is to provide a public telephone verification system and a method of controlling the same for preventing theft of a phone call.

Therefore, the public telephone verification system for achieving the object of the present invention as described above, by using a frequency of the inaudible band during the call to transmit specific information to the public telephone side, and receives the information received from the public telephone analysis As a result, when the information cannot be verified, the line surveillance control device forcibly cutting the telephone line to limit attempts to call fraud, and analyzes the information received from the line surveillance control device, and then verifies the authentication value that can be verified. Forming a public telephone to generate and transmit to the line monitoring control device, a telephone line constituting a communication path in the public telephone period with the line monitoring control device, and an exchanger (not shown) of the telephone station and the public telephone line To this end, it includes a main distribution board configured to be accommodated through the line monitoring control device telephone line incoming from outside the telephone station It features.

In addition, the control method of the line supervisory control apparatus for implementing a public telephone verification system includes the steps of generating a command and a random number (Command & Random number) 1 when a line loop and a charging signal are detected and transmitting it to the telephone side; Receiving an ID (Identification) as a response signal from the telephone side, generating a security key value and transmitting a command and a random number 2 back to the telephone side, and after receiving the authentication value from the telephone side, Comparing the authentication value generated by the monitoring control device, characterized in that it comprises the step of continuing the call if the same value.

Hereinafter, the public telephone verification system according to the present invention will be described in detail.

Figure 1 is a block diagram showing the overall configuration for implementing a public telephone verification system according to the present invention, using a frequency of the inaudible band during a call to generate a specific information transmitted to the public telephone side, and then from the public telephone As a result of receiving and analyzing the response information, when the information cannot be verified, the line surveillance control device 300 forcibly cutting the phone preferences to limit the attempt to negate, and received from the line monitoring control device 300 After analyzing the information, the public telephone 100 for generating an authentication value that can be verified and sent to the line monitoring and control device 300, and a communication path between the line monitoring control device 300 and the public telephone 100 In order to form a communication line with a telephone line 200 constituting the telephone line, a telephone exchange (not shown), and the public telephone 100, a telephone line 200 introduced outside the telephone station is a line monitoring control device 300. Constitute the main distribution frame (400) configured to be received via.

Here, as shown in FIG. 2, the public telephone 100 outputs guide information through a display device, inputs a dial number, amplifies the handset, makes a call available, processes coins and card information, and the like. Analyzes the information input from the telephone control circuit 110 and the line monitoring control device 300 to control various functions of the phone and generates an authentication value that can be verified and transmitted to the line monitoring control device 300. Code analysis controller 130 for verifying that the public telephone can be verified by the telephone line, the telephone control circuit 110 and the telephone line 200 in order to transmit and receive various signals of the code analysis controller 130 and the telephone station The state consists of a line interface 120.

3 is a block diagram showing the detailed configuration of the line monitoring and control device 300 of FIG. 1, when the public telephone 100 is off-hook to start a call, a line loop signal and a busy line The line detecting unit 310 for detecting the charging signal and the specific information during a call are input from the line control unit 340 to modulate the frequency in the inaudible band to the air through the line detecting unit 310 and the telephone line 200. Transmitting the telephone line by the frequency modulation and demodulation unit 320 and the line control signal of the line control unit 340 to transmit to the telephone 100, and restores the frequency received from the public telephone 100 to the digital data call state A line control relay 330 for disabling the signal, a signal period setting unit 350 for arbitrarily designating a signal period to be transmitted to the public telephone 100, and a line control unit 340 for controlling and processing all functions of the circuit. ).

The procedure for the public telephone verification system configured as described above and the control method thereof will be described in detail as follows.

The telephone line 200 introduced into the telephone station is connected to the main wiring board 400 via the line monitoring control device 300, and the telephone line 200 is cut or talked by the line monitoring control device 300. It is supposed to stay possible.

The line control relay 330 of the line monitoring control device 300 is in a non-operational state, but the telephone line 200 and the main wiring board 400 are connected through the contact point, but by the line control signal of the line control unit 340. When the line control relay 330 is operated, the telephone line 200 is forcibly cut to disable the call.

Initially, when the handset of the public telephone 100 is lifted, the hook switch is operated to initialize the telephone control circuit 110. At this time, when a coin or a card of a certain amount (more than one currency) is inserted (payment), the line interface 120 By connecting the telephone line 200 through the zoom will be available.

At the same time, the line detecting unit 310 of the line monitoring control device 300 notifies the line control unit 340 of a line detection signal indicating that the phone line 200 is looped, and thus the phone line 200 is busy. To be aware of. At this time, the line control unit 340 generates a command of 1 byte and a random number 1 to confirm whether the call is normal using the public telephone 100, and then the frequency modulation and demodulation unit 320 at a frequency of the inaudible band. Transmuting is transmitted to the public telephone 100 via the line detector 310 and the telephone line 200.

The information transmitted from the line monitoring control device 300 is input to the code analysis controller 130 through the line interface 120 of the public telephone 100. Here, after analyzing the information, an ID of 3 bytes, which is a response signal, is analyzed. The identification is generated and transmitted to the line monitoring control device 300.

Here, the line monitoring controller 300 checks the received ID, generates a security key value by Software Algoritm, and transmits the command and the random number 2 to the public telephone 100 again.

Thereafter, the public telephone 100 generates an authentication value by the algorithm of the code analysis controller 130 and transmits the authentication value to the line monitoring controller 300, where the line monitoring controller 300 has its own algorithm. If the value generated by comparing the authentication value received from the public telephone 100 and the value is different, the line control unit 340 outputs a line control signal to control the line control relay 330 and the call is cut by the line Will be impossible.

In this operation procedure, the line monitoring control device 300 is a public telephone when the telephone line 200 is detected as busy, when the telephone line 200 is looped, and whenever a billing signal is detected even during a telephone call. 100 is verified, and the signal period setting circuit 350 can be adjusted so that it can be verified at any time.

As described in detail above, according to the present invention, a call of an illegal method using a public telephone line as described above cannot be tolerated, and a public telephone provider having a more secure system is provided to a public telephone provider. will be.

Claims (9)

Using the frequency of the non-audible band during the call to generate specific information and transmit it to the public telephone 100 side, after receiving and analyzing the information received from the public telephone 100, if the information can not be verified, the telephone The line monitoring control device 300 forcibly cutting the preferences to limit attempts to call fraud, analyzes the information received from the line monitoring control device 300, and generates an authentication value that can be verified. A public telephone 100 to be transmitted to the control device 300, a telephone line 200 constituting a communication path between the line monitoring control device 300 and the public telephone 100, a telephone exchanger (not shown), In order to form a communication path with the public telephone 100, the telephone line 200 introduced from the outside of the telephone station is characterized in that it comprises a main wiring board 400 configured to be received via the line monitoring control device 300 Pay phone Verification system. According to claim 1, The public telephone 100 outputs the guide information through the display device, dial number input, amplifies the handset to make a call available state and processing various functions of the public telephone, such as processing information of coins and card amount By analyzing the information input from the telephone control circuit 110 and the line monitoring control device 300 to control and generates an authentication value that can be verified and can be verified by transmitting to the line monitoring control device 300 side Code interface controller 130 for confirming that the public telephone, the telephone control circuit 110 and the line interface 120 for connecting the telephone line 200 to transmit and receive various signals of the code analysis controller 130 with the telephone station Public telephone verification system comprising a). According to claim 1, wherein the line monitoring control device 300 detects a line for detecting a loop signal and a charging signal during a call as the public telephone 100 is off-hook (off-hook) to start a call The unit 310 receives the specific information generated by the department by the line control unit 340 during a call, modulates the frequency into an inaudible band, and uses the line detecting unit 310 and the telephone line 200 through the public telephone 100. And the telephone line is disconnected by the frequency control demodulation unit 320 and the line control signal of the line controller 340 to restore the frequency received from the public telephone 100 to digital data. A line control relay 330, a signal period setting unit 350 for arbitrarily designating a signal period to be transmitted to the public telephone 100, and a line control unit 340 for controlling and processing all functions of the present circuit. Aerial characterized in that Phone Verification System. The system of claim 2, wherein the code analysis controller is modular and can be applied to any telephone. According to claim 1, wherein the line monitoring control device 300 verifies the public telephone 100 when the telephone line 200 is looped, when each billing signal is generated during a call, and at a predetermined time period The control method of the public telephone verification system comprising a. When an off hook and a charging signal are detected, a command and a random number (Command & Random number) 1 are generated and transmitted to the telephone side. After receiving the identification signal (Identification) of the telephone side, Secruity generating a key value and sending a command and a random number 2 back to the telephone side, receiving the authentication value of the telephone side, comparing the authentication value generated by the line monitoring controller, and if the call is the same, And a step of continuing the public telephone verification system. 7. The method of claim 6, wherein after generating the command and the command number < RTI ID = 0.0 > < / RTI > and transmitting it to a telephone side, a line is forced if no identification (ID), which is a response signal of the telephone side, is received for a predetermined time. A control method of a public telephone verification system, characterized in that the step of cutting. 7. The method of claim 6, further comprising the step of forcibly cutting the line if the authentication value is not received from the telephone side for a predetermined time after the step of generating the security key value and sending the command and random number 2 to the telephone side. Control method of public telephone verification system. 7. The system of claim 6, wherein after receiving the authentication value of the telephone side, the step of forcibly cutting the line if it is not the same value in the process of comparing the authentication value generated by the line monitoring control device. Control method.

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