JPH0292051A - Incoming call restriction system in isdn terminal set - Google Patents

Abstract

PURPOSE:To eliminate the need for the complicated procedure of registration and revision by providing a collation means collating an outgoing subscriber number in an outgoing subscriber identification number information element with an incoming enable outgoing subscriber identifier registered in an incoming enable outgoing subscriber identifier storage device in an ISDN terminal set in advance. CONSTITUTION:When an IDDM terminal set receives an incoming signal, whether or not an outgoing subscriber number information element exists in the incoming signal is discriminated, and when the element exists, it is collated with an incoming enable outgoing subscriber identifier set in the ISDM terminal in advance and whether or not the incoming is enabled is discriminated. In the case of incoming enable, no incoming restriction is applied, the incoming signal is received to continue the processing of the call connection. On the other hand, in the case of the outgoing subscriber number information element for the incoming restriction object, the incoming signal is aborted to regulate the call connection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an incoming call restriction method in an ISDN terminal.

[Conventional technology]

Conventionally, incoming call restriction processing to a terminal has been carried out as a control method for incoming call restriction installed in the exchange as one of the services provided to subscribers, and the subscriber who wants to receive the service has to subscribe to the service in advance. The subscriber number, including the PIN that identifies the subscriber, was registered in the storage device inside the exchange, and when a call was received at this terminal, the PIN was checked and the incoming call was controlled within the exchange. .

[Problem to be solved by the invention]

The conventional incoming call restriction method described above cannot restrict incoming calls to the terminal unless the exchange has an incoming call restriction service function, and the subscriber must register for the incoming call restriction service.
This method has the disadvantage that it requires complicated procedures such as registering and changing the calling subscriber number that can receive calls.

An object of the present invention is to provide a method for restricting incoming calls at an ISDN terminal, which eliminates the need for complicated registration and change procedures in the conventional method, by restricting incoming calls within the ISDN terminal in a subscriber's premises. be.

[Means to solve the problem]

The incoming call restriction method for ISDN terminals of the present invention is based on the calling subscriber number in the calling party identification number information element defined in D channel signaling layer 3, which is recommended as an international standard, in the ISDN terminal that performs incoming call restriction. ISD in advance
The ISDN terminal is equipped with a verification means for verifying the ID of a call-receivable subscriber registered in the ID storage device of a call-receivable subscriber in the ISDN terminal. The present invention is characterized in that the subscriber number and the call-receivable calling subscriber identifier are compared, and if the two do not match, the call-in signal is discarded.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the incoming call restriction method in an ISDN terminal according to the present invention.

When a calling signal containing a calling subscriber number information element is sent from the calling subscriber ISDN terminal 20 to the exchange 10 through the subscriber line 1, the exchange 10 receives the incoming call signal carrying the calling subscriber number via the subscriber line 2. Subscriber I SDN terminal 30. The called subscriber ISDN terminal 30 is equipped with a signal receiving device 31, a calling subscriber identifier storage device (hereinafter simply referred to as a storage device) 32, and a collation device 33, and the subscriber of this terminal 30 is able to receive calls. Calling subscriber identifier on signal line 10
The calling subscriber number information element in the incoming signal analyzed by the signal receiving device 31, which is previously stored and registered in the storage device 132 through 0, is sent to the verification device 33 through the signal line 102. The collation device 33 collates this calling subscriber number information element with the incoming callable subscriber identifier obtained from the storage device 32 through the signal line 101 and sends result information via the signal line 103 as to whether or not to restrict incoming calls. and sends it to the signal receiving device 32.

If the result information indicates that the call can be received, the signal receiving device 31 continues the call connection process. On the other hand, if the result information indicates that incoming calls are not possible, the incoming signal is discarded to restrict call connection.

Next, FIG. 2 is a flowchart showing the procedure for verifying the number of a calling subscriber who can receive calls in the embodiment shown in FIG.

I When the SDN terminal receives an incoming signal (Sl), it determines whether or not there is a calling party number information element in the incoming signal (S2). If there is no calling party number information element, it restricts incoming calls. Instead, it receives the incoming signal (S4) and continues the call connection process. In addition, if it is determined in step S2 that there is a calling party number information element, the content of the calling party number information element is further read out, and the content is determined to be the same as the calling party identifier that can receive calls that has been set in the ISDN terminal in advance. The comparison is made to determine whether or not the call can be received (33). If the call can be received, the incoming signal is accepted without incoming call restriction (S
4) Continue call connection processing. On the other hand, if the calling party number information element is subject to incoming call restriction, the incoming signal is discarded (S5) and connection of the call is restricted.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to restrict incoming calls regardless of whether or not the exchange has an incoming call restriction service function, and without having to subscribe to the incoming call restriction service at the exchange. The ability to restrict incoming calls only when desired has the effect of improving usability. Furthermore, it has the effect of restricting incoming calls from a large number of unspecified persons to incoming calls from a specified person or a specified number of people.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the incoming call restriction method in the ISDN terminal of the present invention, and FIG. 2 is a flowchart showing the procedure for verifying the number of callers who can receive calls in the embodiment shown in FIG. 1. . 1.2...Subscriber line, 10...Exchange, 20...
・Calling party I SDN terminal, 30...Calling party IS
DN terminal, 31...Signal receiving device, 32...Incoming call originating party identifier storage device, 33...Verification device. summer! so-called diagram

Claims (1)

[Claims] ISDN terminals that perform incoming call restriction use the calling subscriber number in the calling subscriber identification number information element defined in the D channel signaling layer 3 recommended as an international standard and the ISDN terminal in advance.
A verification means is provided for verifying the identity of the originating subscriber who can receive calls registered in the identity storage device of the originating subscriber who can receive communications within the DN terminal, and when a call is received at this ISDN terminal, the verification means checks the identity of the originating subscriber in the incoming signal. An incoming call restriction method in an ISDN terminal, characterized in that the incoming call signal is discarded when the subscriber number and the callable subscriber ID are compared and the two do not match.