JPS6131661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control system for notifying restricted subscribers of restricted announcements as a countermeasure against switch congestion in a subscriber telephone exchange.

Conventionally, the subscriber control circuit in a subscriber telephone exchange processes the detection of subscriber calls in the subscriber circuit inserted into the subscriber line between the network and the subscriber, and controls the calls during calls and when calls are received. Processing is performed using a known trunk via the network, and the announcement notification when subscriber calling is restricted is processed only for outgoing calls, so it is possible to control only the subscriber circuit and process it using a common circuit. Ta. However, in subscriber telephone exchanges, where the various controls described above are handled by each subscriber without going through the network, that is, by the subscriber terminal control circuit connected to the subscriber line, the processing when restricting outgoing calls is Each subscriber terminal control circuit must be controlled according to the subscriber status, and performing congestion processing such as calling restriction in the software processing of the known storage program exchange method will not solve congestion. Therefore, control processing for each state of each circuit must be performed by hardware for each circuit. This is economically very disadvantageous for subscriber telephone exchanges and cannot be said to be a suitable control system.

An object of the present invention is to provide a subscriber terminal control system in which a subscriber terminal control circuit having a call processing control function is installed for each subscriber in a subscriber telephone exchange,
It is an object of the present invention to provide a more economical subscriber call restriction method that satisfies the function of call restriction control. In other words, in the subscriber terminal control method described above, a subscriber terminal control circuit and a test connection circuit for testing the subscriber line are inserted into the subscriber line, and it is possible to prevent congestion from occurring to the point where calling restrictions are issued. If so, do not perform the test process and connect the test connection circuit to the transmission restriction announcement notification device.
By performing regulation control for each subscriber by instructing the test connection circuit from the subscriber terminal control circuit,
The object of the present invention is to provide a more economical method for making notification announcements when transmission is restricted.

Describing the structure of the present invention, the present invention provides a method for restricting subscriber calls in a subscriber telephone exchange that sends a restriction notification announcement to the subscriber when restricting subscriber calls. By connecting the test connection circuit inserted into the subscriber line as a test connection circuit to the regulation notification announcement transmission device, the entire system including the various connection circuits that connect regulated subscribers to the regulation notification announcement transmission device and these circuits can be connected. When a subscriber makes a call from a subscriber subject to regulation, a regulation notification announcement is sent to the subscriber subject to regulation via the various circuits, and when a subscriber subject to regulation is to be regulated, a communication This is a subscriber call restriction system in which control is performed so that when a call or an incoming call occurs, normal switching processing is performed without going through the various connection circuits mentioned above.

The present invention will be explained below by way of examples with reference to the drawings.

FIG. 1 shows a block circuit diagram of an embodiment of the invention. As shown in FIG. 1, in this embodiment, a subscriber terminal control circuit 4, a test connection circuit 3, and a common control device 8 for controlling notification announcements for each subscriber are connected to the subscriber terminal. A control line 7 to the control circuit 4 and the test connection circuit 3, a notification announcement device 13, and connection paths 9, 1 for connecting the test connection circuit 3 and the notification announcement device 13.
It is composed of 0 and 11. Now, in FIG. 1, when the common control device 8 is instructed to restrict subscriber calls, the common control device 8 connects the test switching relay LT to the test connection circuit 3 via the control line 7 (not shown). Sends a signal to operate. When the relay LT of the test connection circuit 3 operates, the subscriber telephone 1 connected to the subscriber lines 2 and 2 is disconnected from the subscriber terminal control circuit 4 and the network 5 constituting the exchange. In addition, the common control device 8 connects a control line 1 to a duplex circuit 10 in which the test connection circuit 3 is connected to one line at the same time, and a single-stage link 11 that connects the test connection circuit 3 and the notification announcement device 13 to the control line 1.
The closing process is performed via 2. By executing the control described above, the common control device 8 can make an announcement notification to the subscriber that the call is being restricted when the subscriber makes an OFF-HOOK in the call restriction state. When operating switching relay LT of test connection circuit 3, the corresponding subscriber is OFF.
- When in the HOOK state, control the relay LT so that it does not operate. When a relay LT is operating under call restriction, if an incoming call occurs to the corresponding subscriber and the common control device 8 is instructed to execute incoming call connection control, the corresponding relay LT is restored and normal operation is performed. incoming connections. In other words, the software in charge of exchange connection control does not identify the outgoing call restriction state and perform control related to outgoing call restriction, but the common control device 8 restricts outgoing calls and turns OFF to the restricted subscriber. By notifying through an announcement at the time of HOOK and performing connection processing for incoming calls, it is possible to control outgoing calls without impairing service.

FIG. 2 shows an embodiment of the transmission regulation control circuit within the common control device 8 described in FIG. In FIG. 2, the common control device 8 includes a circuit 16 that drives and controls the test switching relay LT provided in the test connection circuit 3 and the relay R for sending a ringing signal to the subscriber when the subscriber receives a call. and 1
7, a memory 18 for storing the presence or absence of a call restriction instruction for the subscriber, a memory 19 for storing a ringing transmission instruction and a call-in-progress display when an incoming call occurs from the software for the subscriber; a memory 20 for storing LT operation instructions from software during testing; an OR circuit 21 for sending signals to the LT drive circuit during transmission regulation and testing;
An AND circuit 22 for sending a signal to the LT drive circuit under the condition that the corresponding subscriber is on a call or no incoming call is issued in response to a calling restriction instruction; An inverting circuit 23 is provided to send a signal to the LT drive circuit under the condition that the LT is not present.

Now, in FIG. 2, when a call restriction instruction is given to the common control device 8 at the time of call restriction, it is stored in the call restriction memory 18 corresponding to the subscriber. As a result, the common control device 8 reads the contents of the transmission restriction memory 18 and sends the contents to the AND circuit 22. In the AND circuit 22, the transmission regulation memory 18
The signal read from the memory 19 and the signal read at the same time from the memory 19 which stores the occurrence of a call or an incoming call are received via the inverting circuit 23, an AND condition is taken, and the result is sent to the OR circuit 21. . In other words, even if an outgoing call restriction instruction is issued, if the corresponding subscriber is busy on a call or an incoming call occurs during outgoing outgoing restriction, the software issues an incoming call connection control instruction to the common control device 8 and stores it in the memory 19. When stored in memory, no signal is output to the OR circuit 21. In the OR circuit 21, the relay
Since the conditions for operating the LT are either when transmission is restricted or when a test instruction from the software is given to the common control device 8 and stored in the memory 20, a signal is output in both cases. The LT relay drive circuit 16 receives the signal and drives the relay LT provided in the corresponding test connection circuit 3, and in the circuit 3, the subscriber line is connected to the regulation notification announcement device by the operation of the relay LT.

Since all of these controls are performed by a logic circuit provided in the common control device 8, it is possible to reduce the exchange processing by software control, which is the original purpose of outgoing call regulation, and to prevent the service from being impaired due to the processing of announcement notifications, etc. Call restrictions will be implemented without any restrictions.

As explained above, according to the present invention, a circuit for switching subscribers during a test is connected to an announcement device when restricting outgoing calls, and a circuit is configured to control the outgoing restricting to be canceled when a call is in progress or an incoming call occurs. By doing so, there is an effect that calling restrictions can be implemented economically without impairing the service at the time of calling restrictions.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of an embodiment of the present invention.
FIG. 2 is a block circuit diagram showing details of the common control device 8 as well as the test connection circuit 3 and subscriber terminal control circuit 4 shown in FIG. The symbols used in the drawings indicate the following. 1...Subscriber telephone, 2...Subscriber line, 3...
Test connection circuit, 4...Subscriber terminal control circuit, 5
...Network, 6...Network control line,
7...Subscriber terminal control circuit control line, 8...Common control device, 9...Test connection circuit control line, 10...
Dual circuit, 11... Single-stage link for testing, 12...
Test link control line, 13... Notification announcement device, 14... Subscriber monitoring circuit, 15... Ringing generation circuit, 16... LT relay drive circuit, 17
... R relay drive circuit, 18 ... Outgoing call restriction instruction memory, 19 ... Call in progress, incoming call occurrence display memory,
20...Test instruction memory, 21...OR circuit, 2
2...AND circuit, 23...Inversion circuit.

Claims (1)

[Claims] 1. A test connection circuit inserted into a subscriber line for testing the subscriber line when restricting subscriber calls in a subscriber call restriction method in a subscriber telephone exchange that sends restriction notification announcements to subscribers when subscriber calls are restricted. The system is equipped with various connection circuits that connect regulated subscribers to the regulation notice announcement transmission device by connecting them to the regulation notice announcement transmission device, and a common control device that controls the entire system including these circuits. When a subscriber makes a call from a target subscriber, a restriction notification announcement is sent to the restricted subscriber via the various circuits mentioned above, and when an attempt is made to restrict a restricted subscriber, when a call is in progress or an incoming call occurs, the above-mentioned A subscriber call restriction system characterized in that control is performed so that exchange processing is performed in a steady state without going through various connection circuits.