JPH07118746B2 - Telephone exchange system - Google Patents

Description

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

[Conventional technology]

For example, when a so-called fast food restaurant becomes a major company, it has a branch network all over Japan. In such cases, if you try to communicate the latest information or discuss issues by holding a branch managers' meeting, you are in a distant place from each other, it is difficult to secure a long time because you are busy, etc. It's not easy to use them all at the same place.

In such a case, the telephone conference service, which allows each person to carry out the conference while sitting at his / her seat, is very convenient.

FIG. 2 is a block diagram of a conventional telephone exchange system that provides a telephone conference service.

In the figure, the information of “conference call service request” and “subscriber telephone numbers of conference participants 102 and 103 requesting to participate in conference” transmitted by the conference organizer 101 by PB dial are PB receivers (PBR). At 104, the information is sent to a central processing unit (CP) 105. The central processing unit 105, based on the information sent from the conference host 101, through the conference trunk (CFT) 106, the conference host 101 and the conference participants 102.
And the channel for connecting the 103 to each other are
W) 107 is used for control.

However, the normal conference call service is "voice-only conference".
Since it is not possible to see the face of the attendee, it is difficult to confirm whether or not all the conference participants were those who originally expected to attend. For example, in the case of the fast food mentioned above,
It is possible that the latest information will be eavesdropped on by competitors, resulting in a break in the competition.

Therefore, as shown in FIG. 3, as a general coping means in such a case, a concealment device is provided on the telephone terminal side in order to protect communication contents.

In the figure, a concealment device (S) 108 is installed on the telephone terminal side of the conference host 101, and similarly, concealment devices 109 and 110 are installed on the conference participants 102 and 103, respectively. As a concealment function of this concealment device, for example, amplitude modulation or frequency modulation is used to convert the original signal, and the original signal cannot be restored without a certain key.

[Problems to be Solved by the Invention]

However, even with the above configuration, there are the following inconveniences.

The information a sent from the conference organizer 101 is converted by the secret device 108 by the above-described means into information f (a), and similarly, the information from the conference participants 102 becomes f (b). Then, when these pieces of information pass through the conference trunk 106, they are sent to the conference participant 103 as f (a) + f (b), but the information that the conference participant 103 should receive is f (a +).
There is a drawback that the information becomes different from that in b).
Here, f (a + b) ≠ f (a) + f (b). That is, the information f (a + b) received by the conference participant 103
Is unclear information, and the intentions [f (a) and f (b)] of the conference organizer 101 and the conference participants 102 are not transmitted at all.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a telephone exchange system that transmits accurate information while maintaining a confidential function.

[Means for solving the problem] In response to a request for a teleconference service from the conference call organizer, the conference call organizer is connected to appropriate conference participants via a conference trunk to conduct a conference call. In a telephone exchange system, a telephone terminal equipped with a secret device having a plurality of kinds of concealment functions that cannot restore a call with a specific key, and a concealment having a plurality of kinds of concealment functions equivalent to the secret device. A conference trunk having a line to which the device is connected, and a telephone terminal of the conference call organizer and a telephone terminal of a conference participant of the other party on the conference trunk when receiving a secret conference call service request signal from the conference call organizer. And a secret control device for controlling each of the concealment devices to operate, and the concealment device of the concealment device of the telephone terminal and the concealment device of the exchange side according to an instruction of the control unit. It is characterized in that the control unit instructs the function selecting device to change the type of the secret function every time the conference call is held with respect to the conference call organizer.

By doing so, not only is the confidentiality of the conference contents secured, but it is also possible to carry out an accurate conversation.

In addition, multiple secret functions that are built into the secret devices on the telephone terminal side and the conference trunk side in advance are used to hold the conference using the secret function selection parameter information created by the conference host's subscriber identification number, time, and random number table. If you change it,
It is possible to increase the confidentiality level.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The components already described are given the same reference numerals and will not be described again.

As shown in the figure, concealment devices 1, 2 and 3 having the same functions as the concealment device (S) provided on the telephone terminal side are installed on each line of the conference trunk 106. Further, each of the concealment devices 1 to 3 is connected to a function selection device (FST) 4 described below, and this device 4 is connected to the central processing unit 105 and the concealment devices 108, 109 and 110 on the telephone terminal side, respectively.

A subscriber information storage device (ID) 5 that stores the subscriber identification number of each subscriber and a timer (TMR) 6 that measures the start time of the conference are connected to the central processing unit 105.

In the state shown in FIG. 1, the PB receiver 104 receives information (for example, a confidential conference call service request, conference participant telephone numbers, etc.) transmitted from the conference host 101 by the PB dial,
The central processing unit 105 analyzes and translates it, and the conference trunk 106
2 shows a state in which the concealment devices 1 to 3 directly connected to are connected to the conference host 101 and the conference participants 102 and 103.

Next, the operation of the telephone exchange system having the above configuration will be described.

Information a and b issued by the conference organizer 101 and the conference participants 102 are
Information f (a), f by passing through the concealment devices 108,109
After being converted into (b), and then passing through the communication path device 107 of the telephone exchange and the concealment devices 1 and 2, the original information a and b are restored by an appropriate key. This information a, b is the conference trunk 106
When entering, each information is added here and becomes a + b, which is input to the concealment device 3. The information is converted to f (a + b) after passing through the concealment device 3, and further passes through the concealment device 110 to return to the original information a + b by the above-mentioned key and the correct information is transmitted to the conference participant 103.

On the other hand, there is a high possibility that the secret function will be decrypted if it is a fixed function, and it is not preferable to leave it as it is. Therefore, it is necessary to increase the confidentiality level by taking appropriate measures even if the confidentiality schemes are the same.

For this purpose, in the present invention, the central processing unit 105 stores the subscriber identification number of the conference organizer 101 in the subscriber information storage unit (I
D) Read from 5, and timer (TMR) for meeting start time
6, and the secret calculation parameter value is determined using a random number table based on these two pieces of information.

Next, the central processing unit 105 sends the confidential calculation parameter value to the function selecting device 4, and at the same time, the confidential devices 108 to 110, 1 to
Instruct to select the concealment function of 3. According to the instruction from the central processing unit 105, the function selecting device 4 sets the secret functions to the secret devices 108 to 110 and 1 to 3 in the same manner and sets the secret calculation parameter value.

By doing so, since the calculation parameter value of the concealment function is created by the random number table of the subscriber identification number and the time of the conference organizer, the conference organizer can enhance the concealment effect without making any special setting, and save the labor. can do.

Further, since the confidentiality calculation parameter value of the confidentiality function is newly determined every time the conference is held, it is possible to obtain a stronger confidentiality effect.

In the present embodiment, the case of making a call through the concealment device has been described, but it is a matter of course that a normal call without a concealment function can be performed unless the "conference call conference service request" is input.

〔The invention's effect〕

As described above, according to the present invention, a concealment device having a concealment function of the same method as the concealment device on the telephone terminal side is provided on the telephone exchange side, and when a conferencing conference call service request is made from the conference organizer, the concealment device is used. By connecting the conference trunk to the conference trunk, it is possible to realize a confidential conference call service that was not possible until now. Furthermore, by changing the multiple confidential functions of these confidential devices each time a conference is held, the confidentiality level can be increased. There is an effect that can be raised.

[Brief description of drawings]

FIG. 1 is a block diagram of a telephone exchange system showing an embodiment of the present invention, FIG. 2 is a block diagram of a conventional telephone exchange system, and FIG.
FIG. 1 is a block diagram when a secret device is installed on the terminal side in the conventional telephone exchange system. 1 to 3,108 to 110 ... Concealment device, 4 ... Function selection device, 5 ... Subscriber information storage device, 6 ... Timer, 101 ... Conference host telephone, 102, 103 ... Conference participant telephone, 105 ...... Central processing unit, 106 …… Conference trunk.

Claims (1)

[Claims] 1. A telephone exchange that is configured to connect a conference call organizer and an appropriate number of conference participants via a conference trunk to conduct a conference call in response to a conference call service request from the conference call organizer. In the system, a telephone terminal provided with a concealment device having a plurality of types of concealment functions that cannot restore a call with a key other than a specific key, and a concealment device having a plurality of types of concealment functions equivalent to the above concealment device. The conference trunk having the connected line and the telephone terminal of the conference call organizer and the telephone terminal of the conference participant of the other party are received in the above-mentioned conference trunk when the secret conference call service request signal is received from the conference call organizer. Connect
A control unit that controls each of the concealment devices to operate, and a function that sets the concealment function of the concealment device of the telephone terminal and the concealment device connected to the conference trunk to the same according to an instruction from the control unit. A telephone exchange system, comprising: a selection device, wherein the control unit instructs the function selection device to change the type of the confidential function each time the conference call is held with respect to the conference call organizer.