JPS63246957A - Call restriction system - Google Patents

Abstract

PURPOSE:To restrict a call from an unspecified subscriber by registering an incoming permission subscriber number to an exchange from a called subscriber and collating a caller subscriber number with the registered incoming permission subscriber number when an incoming all comes to the called subscriber so as to discriminate the propriety of connection. CONSTITUTION:An incoming permission subscriber number from a subscriber 1 is stored in an incoming permission subscriber number field provided in a subscriber data area in a main storage device MM 13. When a call comes from a subscriber 2 to the subscriber 1, the dialing of the subscriber 2 is detected by a channel controller SPC 11, the dialed number by the subscriber 2 is analyzed by a central controller CC 12 to discriminate it that the dialing is an incoming request from the subscriber 2 to the subscriber 1. Then the incoming permission subscriber number stored in the MM 13 is collated with the subscriber number of the subscriber 2 to confirm it that the subscriber 2 is not the incoming permission subscriber. Thus, the SPC 11 connects an announcement machine ANM 16 to a subscriber circuit LC 5 connecting to the subscriber 2 to inform the rejection of call.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a call restriction system, and in particular to a call restriction system for calls from unspecified subscribers [Prior Art] Conventionally, telephone services have provided a system in which anyone can talk to one another. Due to the original purpose of being able to receive a call, it was not done to determine whether or not a call could be received based on the type of the calling subscriber or other factors. However, in recent years, some kind of effective countermeasures have been desired from the perspective of preventing telephone violence (harassment phone calls, etc.) and protecting privacy. Therefore, for example, the call restriction methods currently implemented in Japan include (1) not listing names and phone numbers in the phone book, and (2) giving subscribers two different phone numbers, and calling the number listed in the phone book. (3) The subscriber's telephone R side responds to incoming calls by setting the tone to busy, and so on.

[Problem that the invention seeks to solve]

In the conventional call restriction method described above, anyone who knows the true subscriber number of the called subscriber can receive the call, and the called subscriber is passive and does not know the number. The drawback is that once you finish it, everything except (3) is over.

An object of the present invention is to make it possible to actively reject calls from unspecified subscribers by registering the number of the calling subscriber who makes the call based on the active will of the called subscriber. The objective is to provide a completely new call restriction method.

[Means for solving the problems: 1 The call restriction system of the present invention is based on a call restriction system in which a called subscriber registers a call permission subscriber number in the subscriber data area of a subscriber line exchange. person number field,
It has a verification function that compares the calling subscriber number and the authorized incoming subscriber number registered by the called subscriber in response to an incoming call request to the called subscriber. The calling subscriber is configured to restrict calls to the called subscriber.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 1 shows subscribers 1.2.3 and a subscriber line exchange.The subscriber line exchange includes subscriber circuits (hereinafter referred to as LC) 4. 6. Codec (hereinafter referred to as C0DEC) 7゜8. Line switch (
(hereinafter referred to as LSW) 9, time division switch (hereinafter referred to as TD)
(hereinafter referred to as SW) 10, a channel control device (hereinafter referred to as SPC) 11, a central control unit (hereinafter referred to as CC) 12 including a function of checking the calling subscriber number and the receiving authorized subscriber number, subscriber data/ A main memory device (hereinafter referred to as MM) 13 provided with a field for registering a subscriber number permitted to receive calls in the area, a ring signal device (hereinafter referred to as RI NGER) 14, a tone oscillator (hereinafter referred to as TONE) 15, and an announcement machine. (hereinafter referred to as ANM) 16, incoming trunk (hereinafter referred to as IC)
(referred to as T) 17 is shown. Now, an example will be explained in which subscriber 1 registers the subscriber number of subscriber 3 as a subscriber who is permitted to receive calls, and then receives a call from subscriber 2.

Subscriber 1 first registers the subscriber number of subscriber 3, who is to be permitted to receive calls, from his own telephone. The authorized terminating subscriber number from subscriber 1 is stored in the authorized terminating subscriber number field provided in the subscriber data area in the MMlB.

Now assume that subscriber 2 makes a call to subscriber 1. The subscriber line exchange detects the call from subscriber 2 through LC5 using 5PCII, analyzes the number dialed by subscriber 2 using CCl2, and determines that it is an incoming call request from subscriber 2 to subscriber 1. Based on this determination, CCl2 compares the subscriber number of subscriber 1 stored in MMlB with the subscriber number of subscriber 2, and confirms that the subscriber is not a subscriber permitted to receive calls. As a result, SP and C11 connect ANM16 to LC5 to which subscriber 2 is connected. A
NM 16 notifies subscriber 2 that incoming calls are not permitted. At this time, no action is taken against subscriber 1. On the other hand, if subscriber 3 makes a call to subscriber 1, the operation of the subscriber line exchange is initially exactly the same as for subscriber 2, except that subscriber 3 is the authorized subscriber. If it is determined that RI NGERl is sent to subscriber 1
. . 1 sends a calling signal, and TONE 15 sends TDSWl, O to subscriber 3.

LSW9. A ringing tone is sent through CODEC8 and LC6, and normal connection is then established. Further, in the case of an incoming call from another station, the call enters the ICT 17. If the called subscriber has registered calling restrictions, the receiving station requests the calling station to send the calling subscriber number using existing switching technology (MFC signaling system, etc.), and transmits the calling subscriber number. After receiving,
As already explained, it is checked against the incoming call authorized subscriber number. The following operations are performed in exactly the same way.

Note that it is possible to register a plurality of subscribers as the incoming call permission subscriber number.

〔Effect of the invention〕

As explained above, the present invention provides a means for a called subscriber to register a subscriber number authorized to receive calls in an exchange, and a means for registering a subscriber number that is registered as a calling subscriber number when a call is received to a called subscriber. By having the function of checking the incoming call permission subscriber number and distinguishing whether to connect or not, it has the effect of restricting calls from unspecified subscribers.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention.

Claims (1)

[Claims] In the call restriction system of a local line exchange, a subscriber number field in which a called subscriber registers a subscriber number allowed to receive calls is provided in the subscriber data area of the local line exchange. It has a verification function that compares the calling subscriber number with the authorized subscriber number registered by the called subscriber in response to an incoming call request to a subscriber. 1. A call restriction method for restricting calls to the called party.