JPH0568092A - Congestion control system - Google Patents

Abstract

PURPOSE:To reduce the load on an automatic exchange an congestion by allowing a central controller to send a command restricting dialing of a telephone set to a line circuit controller on the occurrence of congestion and allowing the line circuit controller to restric dialing. CONSTITUTION:A central processing unit (CPU) 110 controls a switching network 100 and line circuit controllers 150,160 based on data stored in a storage device 120 and a station data storage device 130. Moreover, the CPU 110 is provided with a congestion data detection function, a function sending a dial restriction command and a function selecting a telephone set whose dialing is restriced in response to the class stored by the station data storage device 130. On the occurrence of congestion, the CPU 11 ends a command to restrict dialing of telephone sets 170,172 to the line circuit controller 150 and the line circuit controller 150 receiving the command restricts dialing at the telephone sets 170,172. Thus, the load on the occurrence of congestion is relieved to prevent the deterioration in the call served.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a congestion control system for an automatic telephone exchange.

[0002]

2. Description of the Related Art Conventionally, as a congestion control method for an automatic exchange, a calling subscriber is identified by identifying the class type of a subscriber who has detected a call, and then performing busy tone connection processing to the telephone of the subscriber. There is a method of notifying the congestion state to the central controller, and a method of centralizing the call detection information from the line circuit controller which controls a plurality of extension telephones.

[0003]

However, in the above-described conventional congestion control method, the load on the central control unit is not reduced during congestion, or a line circuit for controlling extension telephones having various class types is provided. In the case of the control device, there is a drawback that the central control device cannot perform the calling process according to the class type, which leads to deterioration of the call service at the time of congestion.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a congestion control method for reducing the load at the time of congestion and preventing deterioration of call service.

[0005]

The congestion control method of the present invention for achieving the above object is a line circuit control device having means for controlling a plurality of telephones and for controlling the transmission of the telephones when there is a transmission regulation command. A congestion state detecting means for detecting whether or not the telephone of the line circuit control device is in a congestion state, and a transmission regulation for transmitting a transmission regulation command to the line circuit control device when the congestion state detection means detects a congestion state. Command transmission means is provided, and the line circuit control device side is configured to restrict the call originating from the telephone.

[0006] Then, if necessary, the line circuit control device sends a call according to the class type of the storage part, which stores the class type that determines the order in which the transmission control of the telephone under the control of the line circuit control device is determined. A telephone selection means for selecting a telephone to be restricted is provided.

[0007]

According to the congestion control system having the above configuration, when the telephone controlled by the line circuit control device is in a congestion state,
This congestion state is detected, and at the time of this congestion, a transmission restriction command is sent to the line circuit control device. This allows
The line circuit control device regulates outgoing calls from the telephone.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an automatic exchange to which a congestion control method according to an embodiment of the present invention is applied.

In the figure, reference numeral 150 is a line circuit control device, which comprises a plurality of telephones 170, 171, 172, 17
Has jurisdiction over 3. This line circuit control device 150
When a call restriction command is issued, the call restriction of the selected telephone is performed. 160 is also a similar line circuit control device. A switching network 100 has a function of performing a connection process for transmitting a busy tone from the tone transmitting device 140.

Reference numeral 110 denotes a central control unit (hereinafter referred to as "CPU"), and based on the data stored in the storage device 120 and the station data storage device 130, the switching network 100 and the line circuit control device 150,
It controls 160. The station data storage device 130 stores a class type, which will be described later, which determines the order in which the outgoing call restriction of the telephone is determined.

Further, the CPU 110 has a congestion state detecting function for detecting whether or not the telephones of the line circuit control devices 150, 160 are in a congestion state, and restricts transmission to the line circuit control devices 150, 160 when a congestion state is detected. Sending command sending function for sending commands, and station data storage device 1
A telephone selection function is provided for selecting a telephone for which call restriction is to be performed according to the class type stored in 30.

Next, the operation of this automatic exchange will be described. The CPU 110 processes the switching network 100 and the line circuit controllers 150 and 160 based on the call processing program stored in the storage device 120 and the subscriber data stored in the station data storage device 130. The line circuit control devices 150 and 160 perform processing such as on-hook / off-hook detection and monitoring for the extension telephones 170, 171, 172, and 173 under the line circuit control devices 150 and 160. Further, the CPU 110 controls the line circuit control devices 150 and 160 via the control bus 190. For the control of busy tone, etc., the CPU 110 sends a tone to each extension telephone through the switching network 100 and the communication path buses 180 and 181. Take control.

It is now assumed that the CPU 110 has determined that it is in a congestion state. In this case, the CPU 110 suppresses the call detection information from each line circuit control device from the extension telephone having the class type (FIG. 2) of the special class or higher,
The following processing is performed.

That is, the CPU 110 accesses the station data storage device 130 to check the class type of each extension telephone. Correspondence information between the class type, the extension telephone, and the line circuit control device is stored in the station data storage device 130, an example of which is shown in FIG. 2, the line circuit controller NO. 0 (line circuit controller 150 in this embodiment) has extension numbers 100 of four extension telephones.
0,1001,1002,1003 (each extension telephone 1
70, 171, 172, 173) are stored, and the class types of the respective classes are A, B, B, and A in order. As a result, it is understood that the line circuit control device 150 allows only the extension telephones 171 and 172 to perform the calling process.

Next, the CPU 110 sends a call restriction command to the line circuit controller 150 via the control bus 190 in the format shown in FIG. 3 so as not to detect the call origination of the extension telephones 170 and 173. .. Upon receiving the command, the line circuit controller 150 only monitors the extension telephones 171 and 172 for on-hook / off-hook, and does not perform the same processing for the extension telephones 170 and 173.

Further, the CPU 110 forms a communication path link to the tone transmission device 140 and the switching network 100 in order to constantly transmit busy tone for the extension telephones 170 and 173 which are subject to the transmission restriction,
Busy tone transmission processing is performed to the extension telephones 170 and 173 via the communication path bus 180.

[0017]

As described above, according to the congestion control method of the present invention, when congestion occurs, the line circuit control device for controlling the extension telephone sets the transmission restriction, so that the load on the central control device can be reduced. You can Further, there is an effect that it is possible to prevent the situation that the call processing at the time of congestion corresponding to the class type of each telephone cannot be performed, and it is possible to prevent the deterioration of the call service.

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration of an automatic exchange to which a congestion control system according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing an example of class type information of extension telephones stored in a station data storage device.

FIG. 3 is a diagram showing an example of a format of a call restriction command.

[Explanation of symbols]

 100 switching network 110 central control device 120 storage device 130 station data storage device 140 tone transmission device 150, 160 line circuit control device 170, 171, 172, 173 extension telephone 180, 181 communication path bus 190 control bus

Claims (2)

[Claims] 1. A line circuit controller having means for controlling a plurality of telephones and for controlling the transmission of a telephone when there is a call regulation command, and detecting whether the telephone of the line circuit controller is in a congestion state. Congestion state detection means,
The congestion state detection means is provided with a transmission regulation command transmitting means for transmitting a transmission regulation command to the line circuit control device when it detects a congestion state, and the line circuit control device side regulates transmission of a telephone. Congestion control method. 2. A storage unit that stores a class type that determines the order for restricting outgoing calls of telephones under the control of the line circuit control device, and a telephone set by the line circuit control device that restricts outgoing calls according to the class type of the storage unit. 2. The congestion control system according to claim 1, further comprising a telephone selection unit for selecting the.