JP2902710B2 - 4-wire monitor call connection - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a four-wire monitor call connection system in an electronic private branch exchange.

[Conventional technology]

The method of arbitrarily setting the line of the conventional 4-wire extension terminal is as follows:
This is a method to set the sending and receiving circuits separately.Since the selection signals for setting the sending and receiving circuits are different, the setting is cumbersome, the handling person is apt to make a mistake, and if it is wrong, the sending and receiving parties will be Because they are different, there is a problem that important secrets such as transactions are leaked. Further, when a transmission connection is made, and when another extension terminal monitors a line to which the transmission connection is made, the amount of acoustic connection increases and howling is easily induced.

[Problems to be solved by the invention]

An object of the present invention is to prevent confidential leakage due to troublesome setting of a monitor and a communication partner, incorrect setting of a handling person, and prevention of howling during transmission.

[Means for solving the problem]

The inconvenience of the person who sets up the connection between the 4-wire external terminal and the extension terminal for separate transmission and reception and the security leak due to the incorrect setting of the transmission and reception can be reduced by sending a selection signal once from the extension terminal. The problem is solved by logically storing the data in the storage circuit of the private branch exchange and setting both the transmission and reception simultaneously.

Also, howling during transmission can be solved by cutting off the reception line of the extension terminal device monitoring the line for transmitting only during transmission.

[Action]

According to the present invention, the setting of the other party for transmission and reception can be performed separately by transmitting the selection signal once, and the setting can be performed without mistake between transmission and reception. Also, howling during transmission is prevented.

〔Example〕

 Embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, a selection signal for connecting the extension terminal device 1 to the external line terminal device 10 of the call partner from the extension terminal device 1 in order for the operator to monitor the external line terminal and make a call. The control signal is transferred to the central control circuit 7 by the control data bus 11 via the 4-wire extension subscriber circuit 5, and the selection signal is converted into the accommodation position data of the 4-wire external trunk circuit 9 and stored in the memory of the storage circuit. And the connection of the trunk circuit are set logically. Next, the central control circuit 7 controls the control data bus 11
To control the call switch 6 to connect the extension line subscriber circuit 5 for four lines and the receiving line 12 of the trunk circuit 9 for four lines, and the extension terminal apparatus 1 is connected to the partner external line terminal apparatus 10 to be in a monitor state. Next, the extension terminal 1
When the transmission request signal is transmitted, the central control circuit 7 extracts the data of the external line trunk circuit 9 for the other party's 4-wire logically set from the storage circuit 8 and connects the transmission path 13 of the corresponding call switch 6. . At this time, the connection operation in the case where another extension terminal device monitors the external line terminal device on which a call is transmitted will be described with reference to FIG.

When the other extension terminal device 2 is connected to the 4-wire external trunk circuit 3 to be connected to the own extension terminal device 1 and performs monitoring, the communication path 4 of the other extension terminal device 2 is changed. Is disconnected only during the transmission connection, and the monitoring communication path 4 of the other extension terminal device 2 disconnected by the release of the transmission connection is connected again, and the other extension terminal device 2 returns to the monitoring state.

〔The invention's effect〕

As described above, according to the present invention, the inconvenience of selecting and setting the external line terminal by the extension terminal device of the monitor requester can be solved by performing the setting of the transmission / reception circuit by transmitting the selection signal once. In addition, it is possible to prevent leakage of confidentiality due to incorrect setting of the destination.

Also, howling when a call is transmitted to a destination monitored by another plurality of extension terminals is eliminated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection system between an extension terminal device of the present invention and a partner external line terminal device, and FIG. 2 is a diagram showing a connection system between a plurality of extension terminal devices of the present invention and a partner external terminal device. Fig. 1 1 ... Extension terminal device, 2 ... Microphone, 3 ... Speaker, 4 ... Selection signal transmission circuit, 5 ... Extension subscriber circuit for 4 wires, 6 ... Talk switch, 7 ... Central control Circuit 8 Memory circuit 9 External trunk circuit for 4 wires 10 External terminal device 11 Control data bus 12 Talking circuit 13 Talking circuit, FIG. 2 1 ... extension terminal, 2 ... extension terminal, 3 ... trunk line for 4 lines, 4 ... communication path for monitoring of other extension terminals, 5 ... communication path for transmission of own extension terminal .

Claims (2)

(57) [Claims] An extension subscriber circuit having a transmission path and a reception path and connected to an extension terminal device, a transmission path and a reception path,
An electronic private branch exchange comprising an external trunk circuit connected to any external line terminal device and a call switch connecting between the internal line subscriber circuit and the external line trunk circuit, Upon receiving a selection signal for a connection request to the terminal device, a storage circuit for storing the selection signal, based on the selection signal stored in the storage circuit, a reception path of the extension subscriber circuit and a communication path of the external line trunk circuit. Monitor connection means for controlling the call switch so as to connect to a transmission path; and wherein the extension terminal apparatus is connected to a reception path of the extension subscriber circuit and a transmission path of the external trunk circuit. When receiving a transmission control signal for transmission from the external trunk circuit, the reception line of the external line trunk circuit is pulled out, and the reception line of the external line trunk circuit and the extension subscriber circuit are received. 4-wire monitor call connection method characterized by comprising a transmitter connection means for controlling the call switch to connect the talk channel, the. 2. The electronic private branch exchange has a transmission path and a reception path, and further includes another extension subscriber circuit connected to another extension terminal device, wherein the transmission connection means includes the extension. In a state where the reception path of the subscriber circuit and the transmission path of the external trunk circuit are connected, and the reception path of the another internal subscriber circuit and the transmission path of the external trunk circuit are connected. Receiving the transmission control signal from the extension terminal device, disconnecting the connection between the reception path of the other extension subscriber circuit and the transmission path of the external line trunk circuit, and disconnecting the reception path of the external line trunk circuit. 2. The communication switch according to claim 1, wherein the communication switch is controlled to connect to a transmission path of the extension subscriber circuit.
The described 4-wire monitor call connection method.