JP2002223295A - System for limiting terminating call by number of originating party - Google Patents

Abstract

PROBLEM TO BE SOLVED: To limit connection of terminating call such that only a terminating call originated from a subscriber number registered or not registered in a private branch exchange is connected. SOLUTION: A list of the number of originating parties for granting connection or rejecting connection is stored in an external storage EM 7 and collated with the number of an originating party received from an office line at the office line terminating call thus limiting terminating call.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for restricting connection of an incoming call from a public communication network having a caller number transfer function by a caller number in a private branch exchange.

[0002]

2. Description of the Related Art Conventionally, all incoming calls to a private branch exchange have been connected to an extension telephone, and connection has not been restricted by a calling party number.

[0003]

However, in the above-mentioned conventional system, a prank call or a wrong call cannot be excluded before a response. SUMMARY OF THE INVENTION It is an object of the present invention to limit connection before a call is received by a caller telephone number registered in a private branch exchange.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 is a private branch exchange, in which a caller number of a call arriving from a line having a caller number transfer function is stored in the private branch exchange. The incoming call is connected to the telephone number stored in the server and the incoming call is connected only when the telephone number matches.

According to the present invention, an incoming call can be received only from a subscriber telephone having a caller number registered in the exchange.

According to a second aspect of the present invention, there is provided a method for restricting incoming calls based on a caller ID in a private branch exchange in which a caller ID of a call received from a line having a caller ID transfer function is stored in the telephone exchange. It is characterized in that it is compared with a number, and if there is a match, no incoming connection is made.

According to the present invention, a call cannot be received from a subscriber telephone having a caller number registered in the exchange.

[0008]

FIG. 1 is a system configuration diagram showing an example of an embodiment of the present invention.

In FIG. 1, 1 is an extension telephone, 2 is a line circuit LIN of a private branch exchange, 3 is a switch SW of the private branch exchange, and 4 is a central office trunk COT of the private branch exchange.

Reference numeral 5 denotes a central processing unit CPU for controlling the entire private branch exchange, 6 a main memory MEM, 7 stores a caller number for permitting or excluding the incoming call connection, and an external for checking the caller number of the incoming call. The storage device EM.

Reference numeral 8 denotes a public telephone network. In this embodiment, an integrated service digital network ISDN is assumed. 9 is a subscriber telephone.

In the present embodiment, the integrated service digital network ISDN is assumed as a public telephone network. However, in an analog public telephone network, a central office trunk is provided with a caller ID receiving function, or a common local telephone trunk is provided with a caller. The present invention can be implemented by providing a number receiving device.

FIG. 2 is a list of caller numbers stored in the external storage device EM7. An incoming call from a subscriber telephone number of the public telephone network 8 registered in this list is permitted or excluded from incoming connection. .

FIG. 3 is an internal flowchart of the private branch exchange of the incoming call restriction system in which the incoming call is connected when the caller number received from the central office trunk matches the caller number stored in the external storage device EM7. An outline of the operation will be described with reference to FIG.

In FIG. 1, when a call is sent from a subscriber's telephone 9 to call a private branch exchange, the public telephone network 8
Is connected to the central office trunk COT4, and the telephone number of the subscriber telephone set 9 is sent to the central office trunk 4.

The private branch exchange waits for an incoming call to the central office trunk 4 (step S11). When there is an incoming call, the central office trunk 4 receives the caller ID and receives the caller ID.
5 (step S12).

The central processing unit CPU5 determines whether or not the caller number has been detected (step S13). If the caller number cannot be detected, the incoming call is rejected (step S1).
8). If the caller ID can be detected, this is stored in the external storage device E.
Transfer to M7 (step S14).

The external storage device EM7 collates the transferred caller number with the stored caller number (step S15), and determines whether or not they match (step S1).
6) Return the result to the central processing unit CPU5. If they match, the central processing unit CPU5 performs incoming connection (step S1).
7).

If they do not match in step S16, the central processing unit CPU5 rejects the incoming call (step S18), and sends a disconnection signal from the central office trunk 4 to the public telephone network 8.

In this way, only calls originating from the subscriber telephone number stored in the external storage device EM7 can be connected to the extension telephone 1.

FIG. 4 is an internal flowchart of the private branch exchange of the incoming call restriction system in which the incoming connection is not performed when the caller number received from the central office trunk matches the caller number stored in the external storage device EM7. is there. The outline of the operation will be described with reference to FIG.

In FIG. 1, when a call is transmitted from the subscriber's telephone 9 and the private branch exchange is called, the public telephone network 8
Is connected to the central office trunk COT4, and the telephone number of the subscriber telephone set 9 is sent to the central office trunk 4.

The private branch exchange waits for an incoming call to the central office trunk 4 (step S21). When there is an incoming call, the central office CPU 4 receives the caller ID and receives the caller ID.
5 (step S22).

The central processing unit CPU5 determines whether or not the caller number has been detected (step S23). If the caller number cannot be detected, it cannot be collated with the caller number stored in the external storage device EM7. External storage device E
It is assumed that M7 does not have a number, and an incoming connection is established (step S27). If the caller number can be detected, it is transferred to the external storage device EM7 (step S24).

The external storage device EM7 collates the transferred caller number with the stored caller number (step S25), and determines whether or not they match (step S2).
6) Return the result to the central processing unit CPU5. If they match, the central processing unit CPU5 rejects the incoming connection (step S28).

If they do not match in step S26, the central processing unit CPU5 makes an incoming call connection (step S27).

In this way, only calls originating from other than the subscriber telephone number stored in the external storage device EM7 can be connected to the extension telephone 1.

[0028]

According to the present invention, the caller ID is registered in the external storage device EM7, and the caller ID of the incoming call is compared with the caller ID. Or, if they do not match, the connection can be screened for incoming calls.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a system according to an embodiment of the present invention.

FIG. 2 is a list of caller IDs stored on an external storage device.

FIG. 3 is a flowchart for connecting when a caller ID list is matched.

FIG. 4 is a flowchart for connecting when a caller ID list does not match.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extension telephone 2 Line circuit LIN 3 Switch SW 4 Central line trunk COT 5 Central processing unit CPU 6 Main storage MEM 7 External storage EM 8 Public telephone network 9 Subscriber telephone

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K024 AA65 BB04 BB07 CC01 CC14 DD01 DD02 EE01 GG01 5K049 AA07 BB04 CC05 CC11 EE04 FF01 FF12 FF32 GG16

Claims (2)

[Claims] In a private branch exchange, a caller ID of a call arriving from a line having a caller ID transfer function is compared with a telephone number stored in the exchange, and an incoming connection is established only when the calls match. Characteristic incoming call restriction method by caller ID. 2. In a private branch exchange, the caller ID of a call received from a line having a caller ID transfer function is compared with a telephone number stored in the exchange, and if they match, no incoming connection is made. Incoming call restriction method using caller ID.