JPS6253062A - Method for dialing at callback - Google Patents

Abstract

PURPOSE:To attain sure callback even when a center is a PBX by adopting the constitution that a line wire telephone number stored in advance is dialed when the center makes callback. CONSTITUTION:A password decided to a user registered in advance and a line wire telephone number to an unspecified station at callback are stored in a memory 9<21> of the center connected to a public line 7 via a PBX 3. When the unspecified station makes access, a control section 10<22> collates the password sent from the unspecified station and when the registration is confirmed, lines 7, 8 are cut off once. Then the control section 10<22> commands the transmission of the line wire telephone number stored in the memory 9<21> and this number is sent to the PBX. After the connection with the public line 7 is made, the control section 10<22> commands the sending of a dial signal having a telephone number of the unspecified telephone number to the dial signal generating section 11<23>.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides call back (cal back) using a public line.
Security (l-back)
) system for dialing during call back.

[Conventional technology]

Conventionally, in the call-back security system for data communication systems that can be accessed from unspecified remote devices (hereinafter referred to as "unspecified stations") using public lines, when accessing from unspecified stations, The method used was to enter a telephone number of an unspecified station along with a password, and then re-dial the entered telephone number from the center-side device.

[Problem that the invention seeks to solve]

In the conventional dialing method described above, if the switching system on the center side is a PBX system, when a user at an unspecified station inputs a password and an unspecified station telephone number into the center side device, the switching system on the center side P.B.
If you enter only the phone number of an unspecified station without knowing that it is an However, there was a problem that callbacks could not be made.

[Means for solving problems]

In order to solve these problems, the present invention stores the outside line telephone number, inputs the user's password and unspecified telephone number from the remote device when data communication is possible, and
When registration is confirmed by password verification, the line is disconnected, and a call back is made to the remote device by dialing an outside line telephone number and then dialing an unspecified station telephone number.

[Effect]

In the present invention, even if the user of the unspecified station does not know that a PBX is installed on the center side, it is possible to make a call back to the unspecified station.

〔Example〕

1 shows a data communication system for explaining an embodiment of the call-back dialing method according to the present invention. FIG. In the figure, the modem 2 on the center side is a PBX 3.
Public line7. It is connected to a remote modem 5 via a switched network 4 and a public line 8. Furthermore, a data terminal device 1.6 is connected to each of the modulation and demodulation devices 2 and 5. Data terminal equipment 1. The modem device 2 constitutes a center side device, and the data terminal device 6. The modem 5 constitutes a remote side device.

The modem 2 includes a memory section 21 . Control unit 22° dial signal generation unit 23. The functions of each component of the zero-order modulation/demodulation device 2 including the transmitting/receiving section 24 will be briefly described.

The memory unit 21 stores a password of a user registered in advance and an outside line telephone number to be dialed before dialing an unspecified telephone number input from an unspecified station at the time of a call back. Retains memory contents even if dropped. The control section 22 controls each section of the modulation/demodulation device 2 and checks the password sent from the remote device and the password stored in the memory section 21 .

The dial signal generator 23 sends out a dial signal to connect the remote side device and the public line vA7.8 via the PBX3. The transmitting/receiving unit 24 receives the user's password and the telephone number of the remote device sent from the remote device, and causes data to be transmitted and received between the data terminal device 1.6 of the center device and the remote device. .

In a data communication system using a modulation/demodulation device 2 having the configuration and functions as described above, a call is made via the PBX 3 to an unspecified telephone number input from an unspecified station.
Here's how to back up.

The password and call password determined for the pre-registered user are stored in the memory unit 21 of the modem 2 on the center side, which is connected to the public line 7 via the PBX 3.
An outside telephone number is stored for dialing before the unspecified telephone number input from an unspecified station when accessing the center side when backing up.

When an access is made from an unspecified station, the modem 2 on the center side responds to it, the public line 7.8 is connected via the PBX 3, and data communication becomes possible between the modem 2.5. .

When data communication becomes possible, the user's password and unspecified telephone number are sent from the unspecified station to the center side. The transmitting/receiving section 24 receives these data sent to the center side and transmits these data to the control section 22.

The control unit 22 compares the password sent from the unspecified station with the password registered in the memory unit 21 in advance. As a result of password verification, if it is confirmed that the password sent from an unspecified station is registered in the memory section 21, the control is performed? 11 section 22 instructs the transmitting/receiving section 24 to disconnect the public line 7.8, and the public line '41A7.
Confirm that 8 is disconnected.

After the public lines 7 and 8 are disconnected, the control section 22 first instructs the dial signal generation section 23 to send the outside line telephone number stored in the memory section 21 to be dialed before the unspecified telephone number. The dial signal generation unit 23 sends the dial signal to the PBX3.
Send to. At this time, the external phone number is P.
If a number for accessing an outside line from the BX 3 is stored in the memory section 21 in advance, the PBX 3 that receives the dial signal connects the modem 2 and the public line 7.

Modem and demodulator 2 and public map '4. % 7 is connected, the control section 22 instructs the dial signal generation section 23 to send a dial signal of an unspecified telephone number, and the dial signal generation section 23 sends this dial signal to the public line 7. It is transmitted to the switching network 4 via.

In response to the transmission of this dial signal, the switching network 4 calls an unspecified station, and when the modem 5 of the unspecified station responds and a line is established, data communication is performed between the data terminal devices 1 and 6. becomes possible.

By the above method, if the correct password is entered manually from an unspecified station and the number for accessing the outside line from the PBX 3 is specified for the outside line telephone number stored in the memory unit 21, the center side Even if the user of the unspecified station does not know that the PBX 3 is installed in the station, the user of the unspecified station can make a call back to the unspecified station.

〔Effect of the invention〕

As explained above, the present invention memorizes the telephone number for an outside line, inputs the user's password and unspecified telephone number from the remote device when data communication is possible, and disconnects the line when registration is confirmed by checking the password. By disconnecting, dialing the outside line phone number for accessing an outside line from the PBX, and then dialing the unspecified station phone number to call back to the remote device, the unspecified station user can connect the PBX to the center side. Even if you do not know that a remote station is installed, it is possible to make a call back to an unspecified station, which has the effect of increasing reliability in accessing the remote side device.

[Brief explanation of drawings]

The figure is a system diagram showing a data communication system to which an embodiment of the call-back dialing method according to the present invention is applied. 1.6... Data terminal equipment, 2.5... Modulation/demodulation equipment, 3... PBX, 4... Switching network, 5...
- Modulation/demodulation device, 21... memory section, 22... control section, 23... dial signal generation section, 24...
Transmission/reception section.

Claims (1)

[Claims] In a dialing method at the time of a call back in a data communication system that performs data communication between a center side device and a remote side device, an outside line phone number is stored for dialing before an unspecified station phone number, Enter the user's password and unspecified telephone number from the remote device when data communication is possible, disconnect the line when registration is confirmed by checking the password, dial the external telephone number, and then dial the unspecified telephone number. A method for dialing at the time of a call back, characterized in that a call back is made to a remote side device by dialing.