JPH0752901B2 - Call rejection method - Google Patents

Description

The present invention relates to an incoming call rejection method in an electronic exchange adopting a storage program method.

[Conventional technology]

Conventionally, as a service for reducing this kind of communication cost, there is a minimum cost routing service. In a network composed of a plurality of electronic exchanges, when there is a line connecting from the originating exchange to the terminating exchange, the line having the lowest communication cost in the originating exchange is selected in order.

[Problems to be solved by the invention]

However, in the above-mentioned conventional minimum cost routing service, the call is made through the private network in the originating exchange, and when the originator selects a public network whose communication cost is generally higher than that of the private network and makes the call,
Since nothing can be checked on the called side, there is a drawback that the call is made using the public network, which has a high communication cost.

An object of the present invention is to provide an incoming call rejection method that solves the above problems.

[Means for solving problems]

In order to achieve the above-mentioned object, the call rejection method according to the present invention switches between a public network and a dedicated network between exchanges each having a time-division switch mechanism, a receiving means, and a central processing unit, and switches between the subscriber telephones. An incoming call rejection method for connecting between two parties, wherein the time division switching mechanism is connected to each other by a public network and a dedicated network, and the subscriber telephones to be called are connected by either the public network or the dedicated network. The receiving means receives the subscriber number of the calling subscriber telephone and outputs the data to the central processing unit when an incoming call is received from the central line. Holds a route of a leased line that can be connected to the subscriber's telephone set corresponding to the subscriber's telephone number of the calling side. When a call is received through the public network, the central processing unit of the receiving side Is the above Based on the data input from the receiving means, it is checked whether there is a vacancy in the route of the leased line that can be connected to the calling subscriber's telephone. It has a function of rejecting an incoming call by issuing a command to use it again to make a call again, and making the originating subscriber's telephone set an incoming call using the public network in other cases.

〔Example〕

 Next, an embodiment of the present invention will be described.

Referring to FIG. 1, the incoming call rejection method according to the present invention comprises a plurality of time division switch mechanisms 3 and 14, a receiving means, and a central processing unit.
8 and 15, the public network 9 and the private network 18 are switched to connect the subscriber telephones 1 and 17 to each other.

The plurality of time division switch mechanisms 3 and 14 are composed of the public network 9 and the dedicated network 18.
And are connected to each other, and the target subscriber phone 1,
The public network 9 and the dedicated network 18 connect the 17 to each other.

The subscriber telephone set 1 is housed in the time division switch mechanism 3 by the subscriber circuit 2. The subscriber telephone set 17 is accommodated in the time division switch mechanism 14 by the subscriber circuit 16. Public network 9 is ISDN Primar by digital trunk circuits 4 and 10.
It is connected by y Rate Access (hereinafter referred to as PRI), and the digital trunk circuits 4 and 10 are connected to the D Chanel control circuit (DC) as the receiving means for controlling the D Chanel and layer 2 portions of the PRI.
H) 5, 11 are connected.

Similarly, the time division switch mechanisms 3 and 14 are connected by a dedicated network 18 via digital trunk circuits 6 and 12 and D Chanel control circuits (DCH) 7 and 13 as the receiving means. Here, when there is an incoming call from the subscriber telephone set 17 to the subscriber telephone set 1 through the public network 9, the control circuit 5 causes the calling side subscriber telephone set together with the incoming message from the public network 9.
It receives 17 subscriber numbers and outputs them to the central processing unit 8.
That is, the control circuits 5, 11, 7 and 13 as receiving means receive the subscriber number of the calling subscriber telephone when receiving an incoming call from the central line and output the data to the central processing unit 8 or 15.
The subscriber number of the calling subscriber's telephone set 1 or 17 uses the function of the ISDN line itself which connects the subscriber telephone set 1 or 17 to the D Chanel control circuit 5, 11, 7, 13 by using the control circuit 5, 11 , 7,1
However, the present invention is applied to the case where the route of the dedicated network can be used based on the subscriber number of the calling subscriber's telephone set 1 or 17 sent by the ISDN line. Is characterized in that a private network is used, and in other cases, a public network is used to make a call.

The central processing units 8 and 15 hold a route of a leased line that can be connected to the subscriber's telephone set corresponding to the subscriber number of the calling subscriber's telephone set.
On the basis of the data input from the receiving means, checks whether or not there is a vacant route for the leased line that can be connected to the calling subscriber telephone. It has a function of rejecting an incoming call by issuing a command to make a call again using a dedicated network, and making the calling subscriber telephone set to receive a call using the public network in other cases. That is, each of the central processing units 8 and 15 has a number expansion table (FIG. 2) in the memory that can be searched by the subscriber number and can determine whether or not the connection can be made by the dedicated network 18. It is designed to be expanded by each table of area code 19, area code 20 and subscriber number 21 to obtain a leased line route memory 22. The leased line route memory 22 is a route of a leased line that can be connected to a calling subscriber. The numbers are retained, and it can be seen in FIG. 2 that the connections can be made with 3 routes RT5, RT10, RT15.

The central processing unit 8, 15 checks whether there is an empty route in any of RT5, RT10, RT15, and if there is an empty route, the dedicated network is provided to the calling subscriber's telephone. Call the called subscriber's telephone via the time division switch mechanism as usual to make a call using the public network 9 if there is a talk that encourages you to call again using to enable. If the private line route memory 22 cannot be obtained, it is determined that the connection via the private network is impossible, and the called subscriber telephone is called through the time division switch mechanism as usual to make a call using the public network 9. It has a function that enables

In the embodiment, consider a case where there is an incoming call from the calling subscriber telephone set 17 to the called subscriber telephone set 1 through the public network 9. At this time, the control circuit 5 joins the calling side subscriber together with the incoming message from the public network 9. It receives the subscriber number "03-454-1111" of the central telephone set 17 and sends it to the central processing unit 8.

On the other hand, the central processing unit 8 has a number expansion table (FIG. 2) in the memory that can be searched by the subscriber number and can determine whether the connection can be established by the dedicated network 18, and the calling subscriber number "03" received. "-454-1111" is expanded by each table of the area code 18, area code 20, and subscriber number 21, and the leased line route memory 22 is obtained.

Next, the central processing unit 8 checks whether or not an empty route exists in any route of RT5, RT10, RT15,
When there is an empty route, a talkie is sent to the calling-side subscriber 17 to encourage him / her to redial using the dedicated network 18. When a call is made using the dedicated network 18 based on the command, the subscriber telephones 1 and 17 are connected by the dedicated network 18 and communication becomes possible. If there is no empty route,
The called subscriber telephone set 1 is called through the time division switch mechanism 3 as usual, and the subscriber telephone sets 1 and 17 are connected by the public network 9 to enable communication.

Also, if you can not get the leased line route memory 22,
Assuming that the connection by the dedicated network 18 is impossible, the called subscriber telephone set 1 is called up via the time division switch mechanism 3 as usual, and the subscriber telephone sets 1 and 17 are connected by the public network 9 to enable a call. To

〔The invention's effect〕

As described above, according to the present invention, when an incoming call is received from the central office line, the number of the calling subscriber's telephone is received, and the received subscriber number is used to check whether or not it is possible to connect by a dedicated network instead of the public network. Since the incoming call is rejected when the connection is possible through the network, it is possible to prevent the connection through the office line having a high communication cost in the connection within the dedicated network, and it is possible to reduce the communication cost.

[Brief description of drawings]

FIG. 1 is a relay system diagram showing a call rejection system according to the present invention,
FIG. 2 is a memory block diagram of the present invention. 1,17 …… Subscriber telephone, 2,16 …… Subscriber circuit 3,14 …… Time division switch mechanism, 4, 6, 10, 12 …… Digital trunk circuit 5, 7, 11, 13, …… D Chanel Control circuit, 8, 15 ...... Central processing unit 9 ...... Public network, 18 ...... Private network 19 ...... Area code table, 20 ...... Area code table 21 ...... Subscriber number, 22 ...... Private line route memory

Claims (1)

[Claims] 1. An incoming call rejection method for connecting between subscriber telephones by switching between a public network and a dedicated network between exchanges each having a time divisional switch mechanism, a receiving means, and a central processing unit. The time-division switch mechanism is connected between each other by a public network and a dedicated network, and connects between the subscriber telephones to be called by either the public network or the dedicated network, and the receiving means is Upon receiving an incoming call from a central office line, the subscriber number of the calling subscriber telephone is received and the data is output to the central processing unit, and the central processing unit is a subscriber of the calling subscriber telephone. When the incoming call is received through the public network, the central processing unit on the called side stores the data input from the receiving means. On the basis of, Check if there is a vacant route for the leased line that can be connected to the calling subscriber's telephone, and if there is a vacant route, issue a command to the calling subscriber's telephone to redial using the dedicated network. A call rejection method characterized in that it has a function of rejecting an incoming call and causing the calling subscriber's telephone to receive the call using the public network in other cases.