JP3001480B2 - Dial-in device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dial-in device, and more particularly, to a dial-in device capable of receiving individual identification calls from a remote place to a plurality of communication devices connected to the same public line.

[0002]

2. Description of the Related Art In recent years, portable terminals called electronic organizers and mobile computers have become widespread, and they are often carried when going out. At that time, a person who is out may need to access a personal computer at home from a public telephone or the like while moving.

In this case, in order to access from outside, it is necessary to set a modem connected to a personal computer at home for automatic incoming call and connect the modem to a public line before going out.

However, in this case, since the public line at home is always connected to the modem, all incoming calls to the telephone at home are received by the modem, and the answering machine or F
It cannot coexist with AX.

As a method of using a plurality of communication devices by coexisting an answering machine and a modem on an analog line, a separate line is drawn up or another dial-in number is contracted, and a dedicated device (adapter) is connected between terminals. There is a way to put in. In the dial-in system, a number to be received is sent when a call is received from a station, so that a plurality of communication devices can be used properly by allocating each number by an adapter.

In addition, there is a home switching system in which the switching system once grabs the line, and when the caller dials the communication device ID number there, the terminal having the communication device ID number receives the call.

In ISDN, if both the calling party and the called party have joined the ISDN, they can make and receive sub-addresses by using the standard function of the basic fee. Calls can be made only to the set terminals.

[0008]

However, drawing a separate line with an analog line requires a considerable cost,
In addition, a dial-in contract is cheaper than a separate line, but requires a predetermined fee every month, which increases the burden for home use.

[0009] On the other hand, ISDN is cheaper than using a separate line, but requires a considerable cost and is heavy for home use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a dial-in device which allows a user to freely select a terminal at home from outside and dial in without making a costly contract. I do.

[0011]

In order to achieve the above object, a dial-in apparatus according to claim 1 is interposed between a public line and a plurality of communication devices each having a communication device ID number. Switching means for switching between one of the devices and the public line for connection; and storing a communication device ID number and a caller number transmitted when a first call is made from a telephone transmitting the caller number. Storage means for performing
When a second call is made from the telephone, the stored caller ID is compared with the transmitted caller ID, and when the caller IDs are the same, the switching means is operated to activate the public line. And control means for controlling the connection between the communication device having the stored communication device ID number and the communication device having the stored communication device ID number.

According to the invention having such a configuration, first, a first telephone call is made from a public telephone or the like to the home, and a communication device ID number to be connected to the dial-in device is designated. When the terminal is connected and the second call is made to the home, the dial-in device confirms that the caller ID is the same and checks the communication device ID for the telephone.
You can connect to the terminal with the number and dial in.

[0013] Therefore, if this dial-in device is connected between a public line and a terminal, there is no need to separately sign a contract.
You can freely select multiple terminals at home from outside and dial in.

According to a second aspect of the present invention, in the dial-in device, the control means detects an elapsed time from the first transmission to the second transmission, and determines that the elapsed time is within a predetermined time. When it is determined, the switching means is operated to control the connection between the public line and the communication device having the stored communication device ID number.

According to the invention having such a configuration, it is difficult for the communication software of the portable terminal to send out the password, so that the elapsed time between the first transmission and the second transmission is within a predetermined time. By setting a certain condition as a connection condition, it is possible to confirm that the first caller and the second caller are the same person without using a password.

According to a third aspect of the present invention, in the dial-in device, the control means detects a password transmitted at the time of the first call and, if the password is correct, the first password.
The communication device ID number and the caller number transmitted at the time of the second call are stored in the storage means.

According to the invention having such a configuration, the password can be confirmed at the time of the first transmission, and the computer at home can be protected from others.

According to a fourth aspect of the present invention, in the dial-in device, the control means deletes the communication device ID number and the caller number stored in the storage means after the second call.

According to the invention having such a configuration, on the assumption that remote access is performed from a different telephone every time when going out, the previous data is erased to protect the home computer, and at the same time, the memory is stored in the memory. Waste can be eliminated, and the cost of the apparatus can be reduced.

According to a fifth aspect of the present invention, in the dial-in device, the control means always connects the public line to a specific regular communication device, and when the first transmission and the second transmission are performed. The switching means is operated so as to connect a public line to a communication device having a communication device ID number designated by the first call.

According to the invention having such a configuration, it is possible to normally connect the telephone to, for example, an answering machine, and to receive a call from an outside destination to a desired terminal as needed.

According to a sixth aspect of the present invention, in the dial-in device, the control means always connects the public line to a specific regular communication device, and when the first transmission and the second transmission are performed. The switching means is operated so as to connect a public line to a communication device having a communication device ID number designated by the first call.

According to the invention having such a configuration, a regular communication device such as an answering machine can always be connected to a public line, so that an ordinary telephone from the outside does not receive a call to a modem or the like. And a modem can coexist.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dial-in device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the dial-in device of the present invention. As shown in FIG. 1, a dial-in device 1 is interposed between a public line 2 at home and various communication devices, for example. The dial-in device 1 includes a line switching device 10, a control circuit 11, an MF detection circuit 12, a caller number detection circuit 13, a storage circuit 14, and a clock circuit 15. The public line 2 is connected to a line switching device 10, an MF detection circuit 12, and a caller number detection circuit 13.
The MF detection circuit 12 is connected to the control circuit 11. The caller number detection circuit 13 is connected to the control circuit 11. The storage circuit 14 and the clock circuit 15 are connected to the control circuit 11. The storage circuit 14 stores a preset sender password and guard time. On the other hand, at the other end of the public line 2, for example, a public telephone 3
Is connected.

The switching side of the line switching device 10 is connected to a plurality of modular jacks provided in the dial-in device 1. An answering machine 41, a personal computer as a first communication device 42 via a modem, for example, and a second personal computer as a second communication device 43 via a second modem, for example, are connected to this modular jack. . In addition, communication device ID numbers are assigned to these modular jacks in advance, for example, 01 is connected to the modular jack to which the answering machine 41 is connected, and 01 to the modular jack to which the first communication device 42 is connected. 02, second communication device 4
A communication equipment ID number of 03 is assigned to the modular jack to which 3 is connected.

The line switching device 10 is connected to a control circuit 11, and the communication devices 41, 4
2, 43 is selected to connect to the public line 2. In addition, the line switching device 10 normally connects the public line 2 to the modular jack of the communication device ID number 01, and switches to another modular jack under the control of the control circuit. Therefore, the call is normally received by the answering machine 41.

Next, the operation of the dial-in device 1 will be described. A user of the dial-in device (hereinafter referred to as a caller) sets a communication device that he / she wants to access before going out, in this case, sets the modem of the first communication device 42 to automatic reception, and goes out with a portable terminal. . In addition, a password is set in the dial-in device 1 in advance, and a guard time is set, for example, between 1 minute and 2 minutes.
4 is stored.

The caller makes a first telephone call to his / her home by using the pay phone 3 when he is away from home. When the first incoming call is received, the line switching device 10 always connects the public line 2 to the answering machine 41, so that the answering machine 41 automatically answers or a person answers by raising the handset of the answering machine 41. .

When the caller confirms the response, he / she sends a preset password and a communication device ID number for designating the destination communication device using MF dial tone, here, 02 because he wants to connect to the first communication device. I do.

The control circuit 11 detects a password from the signal received from the MF detection circuit 12 and compares it with the password stored in the storage circuit 14. If the passwords match, the communication device ID number specified for the incoming call is stored in the storage circuit 14. Since the caller number is notified from the caller's telephone 3, the caller number detection circuit 12 notifies the control circuit 11 of the caller number, and the control circuit 11 reads the caller number,
The data is stored in the storage circuit 14. Further, the control circuit 11 reads the time at that time from the clock circuit 15 and stores the time at that time in the storage circuit 14. On the other hand, if the passwords do not match, the password is transmitted to the sender to transmit the password again.

Here, since the setting is completed, the caller once disconnects the telephone 3. Next, the caller connects the modem of the portable terminal to the same public telephone 3 within the guard time set in advance, and makes a second call.

Since the caller number is notified from the caller's telephone 3, the caller number detection circuit 12 notifies the control circuit 11 of the caller number. The control circuit 11 verifies whether the same caller number has been received by comparing it with the caller number stored in the storage circuit 14. If the caller numbers do not match, the telephone is a normal telephone, so the control circuit 11 leaves the line switching device 10 as it is,
Connect to 1.

If the caller numbers match, the current time is read from the clock circuit 15 and the time of the previous call is read from the storage circuit 14 to determine the elapsed time from the previous call, and the time within the guard time set in advance is determined. Check if it is. If it is not within the guard time set in advance, it is determined that the callers are not the same person, and the public line 2 is also connected to the answering machine 41.

After confirming that the caller numbers match and within the guard time, the control circuit 11 reads out from the storage circuit 14 the previously received communication device ID number,
By operating the line switching device 10 according to the communication device ID number, the public line 2 is connected to the first communication device 42,
Switch connection. Thus, the caller can directly access the first communication device 42 without performing any operation at the time of the second telephone call.

After the communication with the first communication device 42 is completed, the caller disconnects the communication and hangs up the telephone. Control circuit 11
Operates the line switching device 10 to switch the connection so that the public telephone line 2 is connected to the original answering machine 41,
All information on the caller number of the caller is deleted from the storage circuit 14. As a result, the control circuit 11 recognizes the next incoming call as the first incoming call.

Since it is premised that the caller ID information is deleted from a pay phone on the go, it is assumed that a call is made from a different pay phone every time. Thus, it is possible to prevent the danger that another person often accesses the personal computer at home using the portable terminal. Further, it is possible to prevent the memory of the storage circuit 14 from being wasted, and to reduce the cost of the device. Therefore, the next remote access is the first telephone call, and the password and the communication device ID are transmitted again.

In the dial-in device 1, the confirmation of the same caller in the second call is made by confirming that the caller has the same caller number instead of the password and that it is within the guard time. Have gone by that. With today's general communication software, there is no function to output a password after connecting unless specially created. It is conceivable to manually connect only the password by leaving the telephone in a branch connection, but it is impossible with a public telephone.
Therefore, in the second telephone call, the dial-in device confirms the caller number and guard time without using a password for the caller, thereby ensuring security.

The dial-in device according to the present embodiment
It is a dial-in device with a remote control that allows only an answering machine to receive a call, not a modem, and allows the modem to receive a call only when necessary. Therefore, the called party uses a public line,
Even when there is no dial-in number other than the contractor number, the communication device to which a call is to be received can be set freely. Further, the device configuration is simple and inexpensive. Further, since there is no need to separately sign up for a dial-in number, or since both the caller and the callee do not need to introduce ISDN, there is no need for a fee other than for the device, and costs can be reduced.

[0040]

As described above, according to the dial-in device of the present invention, it is possible to make individual identification incoming calls to a plurality of communication devices connected to one public line by remote control by telephone only when necessary. In addition, it is possible to freely set a communication device that can receive an incoming call without going through a costly dial-in number contract.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a dial-in device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dial-in apparatus 2 Public line 3 External telephone 10 Line switching apparatus 11 Control circuit 12 MF detection circuit 13 Caller number detection circuit 14 Storage circuit 15 Clock circuit

Claims (6)

(57) [Claims] 1. A switching means interposed between a public line and a plurality of communication devices each having a communication device ID number for switching between one of these communication devices and the public line for connection, and transmitting a caller number. Storage means for storing a communication device ID number and a caller number transmitted when a first call is made from a telephone call; The transmitted caller number is compared with the transmitted caller number, and when the caller numbers are the same, the switching means is operated to connect the public line to the communication device having the stored communication device ID number. Control means for controlling the dial-in device as described above. 2. The control means detects an elapsed time from the first transmission to the second transmission, and when it determines that the elapsed time is within a predetermined time, the control means switches the switching means. 2. The dial-in device according to claim 1, wherein the dial-in device is controlled so as to be operated to connect a public line with a communication device having the stored communication device ID number. 3. The control means detects a password transmitted at the time of the first call and, if the password is correct, a communication device ID number and a caller transmitted at the time of the first call. 3. The dial-in device according to claim 1, wherein a number is stored in said storage means. 4. The communication apparatus according to claim 1, wherein the control unit deletes the communication device ID number and the caller number stored in the storage unit after the second transmission.
4. The dial-in device according to 2 or 3. 5. The control means always connects a public line to a specific regular communication device, and when the first transmission and the second transmission are performed, the public line and the first transmission are connected. 5. The dial-in device according to claim 1, wherein the switching means is operated so as to connect to a communication device having a communication device ID number designated by the call. 6. The system according to claim 5, wherein after the second transmission is completed, the control unit controls the switching unit to connect a public line to the regular communication device. A dial-in device as described.