JPH06105935B2 - Telephone exchange system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is used in the field of telephone communication.

The present invention relates to a telephone exchange system, and more particularly to a telephone exchange system that provides a secret telephone conference service.

〔Overview〕

According to the present invention, in a telephone exchange system that provides a telephone conference service, a first concealment device is provided on the telephone terminal side, and the same unencrypted information as the first concealment device is encrypted on the telephone exchange side. A second concealment device having a concealment means for returning the encrypted information to the original information is provided, and at the time of the conferencing teleconferencing service, a telephone terminal that conducts a conference is transferred via the first and second concealment devices. By connecting to the conference trunk in the telephone switchboard, it is possible to realize the secret conference call service.

[Conventional technology]

Conventionally, the telephone exchange system that provides the telephone conference service is
It has the structure shown in FIG. The PB receiver (PBR) 10 receives the conference call service request and the subscriber telephone numbers of the conference participants B and C sent by the conference organizer A through the PB dial, and the information is stored in the central processing unit (CP) 8. Sent.
In the central processing unit 8, based on the information sent from the conference host A, the call trunk for connecting the conference host A, conference participants B and C to the conference trunk (CFT) 9 It is realized by using SW) 7.

[Problems to be solved by the invention]

Since the conference call service described above is a conference with only audio, it is difficult to confirm that all the conference participants are the expected ones. As a means for protecting the communication contents, as shown in FIG. 3, the concealment devices (S) 4, 5 and 6 are provided on the telephone terminal side.
It is a general means to provide and respond. However, in this case, as shown in FIG. 3, the information that has passed through the concealment devices 4 and 5 that has concealment means that encrypts the unencrypted information and restores the encrypted information to the original f Conference trunk 9 when (a) and f (b)
Conference participant C becomes f (a) + f (b)
(Telephone terminal 3). By the way, since the information f (a + b) that the conference participant C should receive is f (a + b) ≠ f (a) + f (b), there is a problem that the confidential conference call service cannot be realized.

The object of the present invention is to solve the above problems by
It is to provide a telephone exchange system capable of realizing a secret telephone conference service.

[Means for solving problems]

The present invention adds three or more telephone terminals, a PB receiver for receiving a telephone conference service request from the telephone terminals, and signals from a plurality of the telephone terminals to other telephone terminals participating in the conference. In a telephone exchange system provided with a telephone exchange including a conference trunk for performing conference telephone processing for transmission, a first concealment device for respectively encrypting and decrypting the signal is provided on the telephone terminal side, and the telephone The second encryption device on the exchange side has the same encryption and decryption means as the first encryption device and is provided corresponding to each telephone terminal, and the PB receiver is provided from the telephone terminal. And a control means for connecting the telephone terminal, which conducts a conference, to the conference trunk via the second confidential device when the confidential telephone conference service request is received. Telephone end The signal encrypted by the first secret device from the end device is decrypted and given to the conference trunk, and the signals added to the conference trunk to the other telephone terminals participating in the conference are encrypted respectively. It is characterized in that it is provided with a means for doing.

[Action]

At the time of the secret conference telephone service, a telephone terminal for a conference is connected to the conference trunk via the first and second secrecy devices.

Therefore, for example, the information a and b from the conference organizer A and the conference participant B are converted into the information f (a) and f (b) respectively through the respective first secret devices,
The information a + b input to the respective second concealment devices provided in the telephone exchange, restored to the original information a and b, and input to the conference trunk, and the information a + b added there are stored in the second concealment device by f ( It is converted into a + b) and sent to the first secret device, where it is returned to the original a + b and transmitted to the conference participant C. That is, a secret telephone conference service can be realized.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention. In this embodiment, three telephone terminals 1, 2 and 3,
A PB receiver (PBR) 10 that receives a conference call service request from a telephone terminal and a conference trunk (C that handles conference call processing)
In a telephone exchange system including a telephone exchange 20 including an FT) 9, first telephone concealing devices (S) 4, 5 and 6 are provided on the telephone terminals 1, 2 and 3 side, respectively.
The second concealment device 11, 12 and 13 having the same concealment means as the first concealment device 4, 5 and 6 and corresponding to the respective telephone terminals 1, 2 and 3 and the PB receiver on the 20 side When the 10 receives the confidential conference call service request from the telephone terminals 1, 2 and 3, the telephone trunks 1, 2 and 3 which conduct the conference via the second confidential devices 11, 12 and 13 are used as conference trunks. A speech path device (SW) 7 and a central processing unit (CP) 8 having a control means connected to 9 are provided.

The feature of the present invention is that, in FIG.
6, 11, 12 and 13 are provided, and when the confidential telephone conference service request is received, the telephone path devices 7 and the central processing unit 8 pass the telephone terminals 1, 2 and 3 for the conference through the confidential apparatuses 11, 12 and 13. Further, there is provided a control means for connecting to the conference trunk 9 via the communication path device 17.

Next, the operation of this embodiment will be described. In FIG. 1, the telephone terminal 1 is the conference host A, the telephone terminal 2 is the conference participant B, and the telephone terminal 3 is the conference participant C, and the information transmitted from the conference host A by the PB dial ( For example, a confidential conference call service request, conference participant telephone numbers) are received by the PB receiver 10, and the central processing unit 8 analyzes and translates the confidential conferences 11, 12 and 13 into the conference organizer A,
Concealment device 1 connected to conference participants B and C respectively
1, 12, and 13 are further connected to the conference trunk 9 by a communication path device 7
It is the figure connected using.

Information a and b issued by the conference organizer A and the conference participant B
Is converted into information f (a) and f (b) by passing through the concealment devices 4 and 5, respectively, and then the original information is passed through the speech path device 7 of the telephone exchange 20 and the concealment devices 11 and 12. Returning to a and b, the information enters the conference trunk 9, and each information is added and becomes a + b, which is input to the secret device 13. Information passes through the secret device 13
(A + b), and when the information passes through the concealment device 6, the original information a + b is restored, and the correct information is transmitted to the conference participant C.

[Effects of the Invention] As described above, according to the present invention, the first concealment device is provided on the telephone terminal side, and the second concealment device has the same concealment means on the telephone exchange side as the concealment device on the telephone terminal side. By providing a device and a control means for connecting to the conference trunk via the second secret device when a secret teleconferencing service request is received from the conference organizer, a secret telephone which has been impossible to realize until now. There is an effect that a conference service can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing a conventional example. FIG. 3 is a block diagram showing a case where a concealment device is installed on the telephone terminal side in the conventional example. 1-3 ... telephone terminal, 4-6, 11-13 ... concealment device (S), 7 ... communication path device (SW), 8 ... central processing unit (CP), 9 ... conference trunk ( CFT), 10 …… PB receiver (PBR), 20 …… telephone exchange.

Claims (1)

[Claims] 1. Three or more telephone terminals, and receiving a conference call service request from the telephone terminals.
A telephone exchange system comprising a PB receiver and a telephone exchange including a conference trunk for performing conference call processing for adding signals from a plurality of the telephone terminals and transmitting the signals to other telephone terminals participating in the conference. A first concealment device for respectively encrypting and deciphering the signal is provided on the machine side, and the same enciphering and deciphering means as the first concealment device is provided on the telephone exchange side for each telephone terminal. A second concealing device provided corresponding to the device, and the PB receiver performs a conference via the second concealing device when the PB receiver receives a conferencing conference call service request from the telephone terminal. Control means for connecting a telephone terminal to the conference trunk, wherein the second secret device deciphers a signal encrypted from the telephone terminal by the first secret device, and thereby the conference Trang To give, telephone exchange system, characterized in that it comprises means for encrypting each signal to the conference trunk summed conference other telephones of participants.