JPS61198856A - System for tracing malicious call - Google Patents

Abstract

PURPOSE:To trace a malicious call without hooking operation by collating a call with a malicious call tracing registering table at a call from an outgoing station and executing the trace of malicious call at the state of calling when the caller is a malicious call registration subscriber. CONSTITUTION:When a malicious caller 6 dials a telephone number of an incoming subscriber 7, the dial number is collated with a subscriber number registered in the malicious call tracing registration table 3 provided in an exchange and when they are coincident, just after the incoming subscriber 7 replies, only the channel of incoming subscriber 7 malicious call sender 6 is interrupted. This is conducted by cutting off the path of the secondary time switch 14 during a prescribed timing period only. When the incoming subscriber 7 hooks off during the said timing period, since the channel is set to a path of incoming subscriber 7 malicious call sender 6 only, a click sent to the path of incomingsubscriber 7 malicious call sender 6 i not sensed by the malicious call sender 6.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a malicious call tracking system in a switched network, and in particular, to a system for tracking malicious calls in a switched network, and in particular, to prevent the calling party from recognizing that the called party is tracking a malicious call. This paper relates to a malicious call tracing method that uses hooking operations to prevent malicious calls.

Malicious call tracking in a switched network must be carried out quickly and without the caller's knowledge; conventionally, the called party performed a hooking operation to activate malicious call tracking in the switched network. However, with this method, there is a risk that the caller will be able to detect the call, and there has been a strong demand for the development of a method for tracking malicious calls that will not be obvious to the caller.

[Conventional technology]

It is well known that there is a strong demand for quickly detecting the source of a malicious call in order to track down the culprit in cases of blackmail and the like.

FIG. 3 is a diagram showing an example of a conventional malicious call tracing method.

In the figure, 1 is the originating station, 2 is the outgoing trunk of the originating station 1, 3 is the malicious call tracking registration table, 4 is the terminating station, 5 is the trunk of the terminating station 4, 6 is the originating subscriber, and 7 is the terminating subscriber. It is. The same symbols represent the same objects throughout the figures below. In the following description, the outgoing trunk will be referred to as OCT, and the incoming trunk will be referred to as ICT.

In the conventional malicious call tracing method, a malicious call tracing registration table 3 is prepared in advance at the originating station 1 or the terminating station 4.

Based on a request for malicious call tracing issued in advance by a subscriber, either the station side or the subscriber is registered in the malicious call tracing registration table 3.

Assume that the subscriber 7 who is currently receiving the call is a subscriber registered in the malicious call tracking registration table 3. At this time, it is assumed that an arbitrary subscriber 6 (the originator of the malicious call) calls subscriber 7.

In response to this call, the called subscriber 7 hooks off and enters the conversation, and the called subscriber 7 confirms the malicious call and performs a hooking operation.

Based on this hooking operation, the originating station 1 or the terminating station 4 checks the telephone number of the terminating subscriber 7 and its own malicious call tracing registration table 3. In FIG. 3, the originating station 1 has the malicious call tracing registration table 3. ), if the subscriber 7 who performed the hooking operation
If the subscriber is registered in the malicious call tracing registration table 3, it is recognized that the subscriber is being tracked as a malicious call, and immediately starts tracking the telephone number of the calling subscriber 6, and outputs the message of the malicious call (calling (subscriber 6's telephone number, etc.) and a monitor telephone.

However, in the conventional malicious call tracking method described above, the click sound generated by the hooking operation performed by the calling subscriber 7 is transmitted to the calling subscriber 6.
This has the disadvantage that it becomes obvious to the originating subscriber 6 that the malicious call is being tracked, and the culprit gets away with it.

[Problem that the invention seeks to solve]

The purpose of the present invention is to eliminate the drawbacks of the conventional system described above, and to provide a malicious system having a function of preventing the click sound generated when a called subscriber performs a hooking operation to request tracking of a malicious call from being sent to the calling party. The purpose of the present invention is to provide a call tracking method.

[Means for solving problems]

A means to solve the problem is to use a telephone switching network consisting of a calling station and a receiving station, which is equipped with a function to start tracking malicious calls by hooking a subscriber who has registered a malicious call at the receiving station. When a call is made at the originating station, it is checked against the malicious call tracking registration table, and if the malicious call is a registered subscriber, the malicious call is traced while the call is in progress, and after the call is answered, the terminating station temporarily cancels the call. This is accomplished by cutting the path to the station so that the click sound produced by the hunking operation is not transmitted to the caller.

In addition, an emergency level display and a malicious call tracking time zone table are added to the above malicious call tracking registration table, and a ring tone is sent to the called subscriber depending on the level of urgency and time zone, as well as the caller's phone number, monitor phone number, and the incoming call. This is achieved by outputting the subscriber's messages.

[Effect]

According to the present invention, in order to prevent the sending of a click sound caused by a hooking operation performed by a called subscriber, the exchange is equipped with a function that temporarily disconnects the communication path on one side (from the called side to the calling side). In addition, by providing a time table for emergency tracking, it is possible to perform malicious call tracking without the need for the receiving subscriber to perform a hooking operation within that time period, which will ultimately prevent the hooking operation. This has the effect of preventing the subscriber who made the malicious call from hearing the click sound generated by the system and escaping, thereby making it possible to effectively track down the culprit.

〔Example〕

FIG. 1 is a diagram showing an embodiment of preventing the transmission of click sounds in an exchange system.

FIG. 2 is a diagram illustrating an embodiment in which malicious call tracing is performed without a hunking operation.

In the figure, 10 is a subscriber line track, 11 is a line concentrator, 12 is a primary time switch, 13 is a control memory of the primary time switch 12, 14 is a secondary time switch, 15 is a control memory of the secondary time switch 14,
16 is SSW, 17 is control memory of 5SW16, 18
is the primary time switch, 19 is the primary time switch inch 18
20 is a secondary time switch, 21 is a control memory of the secondary time switch 20, 22 is a line concentrator, 23 is a subscriber line tracker, and 24 is a malicious call tracing time period χ.

The present invention will be described in detail below with reference to the drawings.

In FIG. 1, 6 is the malicious call originator, 7 is the terminating subscriber, and - is the communication path from the malicious call originator 6 to the terminating subscriber 7.
- represents the communication path from the receiving subscriber 7 to the malicious call originator 6.

When the malicious call originator 6 dials the dialed number of the called subscriber 7, this dialed number is compared with the subscriber number registered in the malicious call tracking registration table 3 provided in the exchange, and if they match, the dialed number is checked. Immediately after the terminating subscriber 7 responds, only the communication path between the terminating subscriber 7 and the malicious call originator 6 is disconnected. This is done by cutting the path of the secondary time switch 14, which cuts only within a certain timing period.

If the terminating subscriber 7 hooks within this timing period, only the route from the terminating subscriber 7 to the malicious call originator 6 is set, so the route from the terminating subscriber 7 to the malicious call originator 6 is set. The click sound sent to the public is not detected by the malicious call originator 6.

After receiving the hooking signal or after the end of the timing period, the route from the disconnected subscriber 7 to the malicious call originator 6 is reset, and the call is enabled.

The embodiment shown in FIG. 2 is the same as the embodiment shown in FIG. 1 until the subscriber number registered in the malicious call tracing registration table 3 is verified.

However, after that, it is determined whether the called subscriber 7 is an object of emergency tracing or not based on the priority display in the malicious call tracing registration table 3.

In Figure 2, the symbol ■ shown in Malicious Call Tracking Registration Table 3 indicates that registration is in progress, and if there is a subscriber who wishes to receive malicious call service, the maintenance staff of the switching center must submit the application. After receiving the malicious call service from the user, the subscriber (DN-telephone number) implementing the malicious call service is registered in the exchange.

One way to do this is to type in the name of the subscriber who will receive malicious call tracking from a typewriter. A software program within the exchange writes this subscriber information into the malicious call tracing registration table 3.

If the subscriber wishes to cancel the malicious call tracing, he or she may similarly type in the intention to cancel using a typewriter, and the software program within the exchange will delete the subscriber information from the malicious call tracing registration table 3.

Therefore, symbol I is used as a method for determining whether a registration area is in use or not.

In addition, the symbol P shown in the malicious call tracking registration table 3 in Figure 2 is a priority display, which is used to determine whether the subscriber is an emergency tracking subscriber or not. If there is, refer to the malicious call tracking time zone table 24, and if the current time is within that time zone, a ring tone is sent to the called subscriber 7, and the caller's telephone number, monitor telephone number, and called subscriber 7 are sent. Outputs the message. Hooking of the called subscriber 7 is therefore unnecessary.

Furthermore, the malicious call tracing time zone table and priority display in the malicious call tracing registration table 3 in the above description can be changed at any time, making it possible to provide flexibility to the system.

Furthermore, a mechanism for outputting a malicious call tracing message without a hooking operation during a call can be implemented in other conditions, such as when the called subscriber 7
It is also applicable when responding to

〔Effect of the invention〕

As explained in detail above, the present invention has the great effect that the click sound generated by the hooking operation cannot be heard by the caller, and malicious call tracing can be performed without performing the hooking operation. .

It is a figure which shows one example of prevention.

FIG. 2 is a diagram showing an embodiment in which malicious call tracking is performed without hooking operations.

FIG. 3 is a diagram showing an example of a conventional malicious call tracing method.

In the figure, 1 is the originating station, 2 is the outgoing trunk of the originating station 1, 3 is the malicious call tracking registration table, 4 is the terminating station, 5 is the incoming trunk of the terminating station 4, 6 is the originating subscriber, and 7 is the terminating subscriber. , IO is a subscriber line track, 11 is a line concentrator, 12 is a primary time switch, 13 is a control memory of the primary time switch 12, 14 is a secondary time switch, 15 is a control memory of the secondary time switch 14, 16 is SSW , 17 is 5SW16 (7) control/-T-17, 18 is the primary time switch, 19 is the control memory for the -next time switch 18, 20 is the secondary time switch, 21 is the control memory for the secondary time switch 20, 22 3 dice

Claims (1)

[Scope of Claims] 1. In a telephone switching network consisting of a calling station and a terminating station, which is equipped with a function of starting malicious call tracking by a hooking operation of a malicious call registered subscriber of the terminating station, the calling station When a call is made, it is checked against the malicious call tracing registration table, and if the malicious call is a registered subscriber, the malicious call is traced while the call is in progress, and after the call is answered, the call is temporarily transferred from the receiving station to the calling station. A malicious call tracing method characterized in that a click sound generated by a hooking operation is not transmitted to the caller by cutting the path of the caller. 2. Add an emergency level display and a malicious call tracking time zone table to the above malicious call tracking registration table, and send a ring tone to the called subscriber depending on the level of urgency and time zone, as well as the caller's phone number, monitor phone number, and the corresponding phone number. A malicious call tracing system according to claim 1, characterized in that a message of a called subscriber is output.