JP2641590B2 - How to make an outside line indicator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an external line display provided in an extension terminal connected to a switching device.

[Prior art] Conventionally, in a switching system that accommodates an ISDN line as an outside line, when an ISDN line is captured and a call is made, first the ISDN
Reserve one of the B1 and B2 channels, which are the line information channels, and then enter the dialing information. When all input is completed, send outgoing request signal from the D channel that specifies the ISDN line information channel. When an incoming call request signal is received from the ISDN line, a response is made according to the state of the B channel specified by the incoming call request signal.

[Problem to be Solved by the Invention] However, in the above-mentioned conventional example, for example, while a user reserves a B1 channel of an ISDN line from an extension telephone and inputs dial information, an incoming request signal designating the B1 channel from the ISDN line When the is detected, since the call has not yet been captured, the call is answered, and the user who reserves the B1 channel and performs a call operation has a drawback that the user is very confused.

The present invention has been made in order to solve the above-mentioned problems, and provides a control method of an external line display that can reliably notify a user of interruption of transmission due to an incoming call when transmitting to a digital network. Aim.

[Means for Solving the Problems] In order to achieve the above object, the present invention relates to a method for controlling an outside line indicator provided in an extension terminal connected to an exchange, wherein the outside line is connected to the exchange. In response to an operation of an external line key for designating the digital network line, the external line display device is controlled to perform a predetermined display, and the external line display device displays the predetermined display when an incoming call is received from the digital network line. If so, the predetermined display on the outside line indicator is released.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

<Description of Configuration (FIGS. 1 and 2)> FIG. 1 is a schematic block diagram showing the configuration of the switching system in this embodiment.

In the figure, A0 is a main unit of the present switching system, and performs line switching between an outside line and an inside line. A1 is an ISDN line accommodated as an external line, and in this embodiment, is connected to the basic interface (2B + D). A2 is an ISDN trunk circuit for accommodating the ISDN line A1, and is a circuit that performs data link control with the ISDN line A1 and detects an incoming call from the ISDN line A1. A3 is a transmission line switch circuit for connecting / disconnecting a highway link in accordance with an instruction from a CPU A4 described later.

A4 is a CPU (Central Control Unit), which controls the entire switching system according to a control procedure (program) described later. A5 is a ROM, which is a memory storing a program for the CPU A4. A6 is a RAM, which is a memory configured by a work area and various control tables used by the CPU A4 when executing processing. A7 is a dedicated telephone interface circuit for exchanging data with the dedicated telephones A10 and A11 to be accommodated. The dedicated telephone interface circuit A7 in this embodiment can accommodate two dedicated telephones.

A8 and A9 are dedicated telephone extensions, and are cables for connecting the interface circuit A7 and the dedicated telephones A10 and A11, respectively. A10 and A11 are dedicated telephones, which are extension telephones accommodated in the switching system. A20 to A23 are highways, and A20 and A21 connect the ISDN trunk circuit A2 and the transmission line switch circuit A3, while A22 and A23 connect the dedicated telephone interface circuit A7 and the transmission line switch circuit A3. I have. A24 to A28 are data buses coming out of the CPU A4.

FIG. 2 is a view showing the appearance of the above-mentioned dedicated telephones A10 and A11. In the figure, B1 is an LCD display for displaying the time and dial number, etc., B2 is a handset for talking, B3 is a function key such as a one-touch dial, B4 is a dial key, and B5 is a dial key.
Is an outside line key for designating an outside line, and B6 is an outside line capturing lamp indicating whether or not an outside line is being captured.

In the above configuration, in this embodiment, the ISDN line A1 (2B
+ D), two information channels (B1, B2) are connected to highways A20, 21 by an ISDN trunk circuit A2, and the transmission line switch circuit A3 is connected to the highways A22, A23, so that the dedicated telephones A10, A23 are connected. A communication path between A11 and the ISDN line A1 is set.

The D channel of the ISDN line A1 is an ISDN trunk circuit.
A2 connects to the data bus A27, and the information is sent to the CPU A4. The CPU A4 controls the transmission line switch A3 based on the information, or exchanges data for controlling the exclusive telephone with the interface circuit A7 for the exclusive telephone via the data bus A28, and controls the exclusive telephones A10 and A11. .

<Description of Control Procedure (FIG. 3)> Next, the control processing in the present embodiment will be described below with reference to the flowchart shown in FIG.

First, in step S1, a flag (external line capture flag) indicating whether or not the ISDN line A1 has been captured is initialized (OFF), and in the next step S2, an ISDN trunk circuit A2 as a peripheral interface or a dedicated telephone is set. Wait for reception of data from the interface circuit A7.

Note that the outside line capturing flag in the present embodiment is defined in a flag area in the RAM 6, and is provided corresponding to the ISDN line A1.

Here, when the user presses one of the external line keys B5 of the special telephone A10, information on the press of the external key B5 is transmitted from the special telephone A10 to the special telephone interface circuit A7 via the special telephone extension A8. . The interface circuit A7 for the exclusive telephone which has input the information of the press of the external line key B5 notifies the CPU A4 via the data bus A28.
In response to this notification, the CPU A4 advances the process to step S3, and advances the process to each of the following steps depending on the content of the received data.

In the case of external line capturing, the process proceeds to step S4, the external line capturing flag is reset (ON), and the external line capturing lamp B6 is sent to the dedicated telephone A10 via the data bus A28, the dedicated telephone interface circuit A7, and the dedicated telephone extension A8. Support the lighting.
Then, the user is informed of the capture, and the above-described step S2 is performed.
And waits for dial information to be sent from dedicated telephone A10.

Further, in step S2, when the ISDN trunk circuit A2 receives the incoming request signal from the ISDN line A1, it notifies the CPU A4 of that fact via the data bus A27. In response to this notification, the CPU A4 advances the process from step S3 to step S5, and determines whether the outside line capture flag is ON or OFF. As a result, if the outside line capture flag is OFF, the process proceeds to step S8, and the response signal (call proc or alurt) to the incoming request signal is sent to the ISDN trunk circuit A2 via the data bus A27.
Signal), and thereafter performs normal incoming call processing.

This incoming call processing is a known technique, and a detailed description thereof will be omitted.

On the other hand, if the outside line capture flag is ON in step S5, the process proceeds to step S6, and the outside line capture flag is turned OFF.
Then, in the next step S7, an instruction is given to the dedicated telephone A10 via the data bus A28, the interface circuit A7 for the dedicated telephone, and the extension A8 to turn off the external line capturing lamp B6. And
The process proceeds to step S8, and a normal incoming call process is executed.

According to the above-described embodiment, even if an incoming call request signal is received from an ISDN external line while the ISDN external line is being captured, it is not possible to make a call from the captured external line, and the operation becomes easier.

In the above-described embodiment, the external line capture flag is provided for each ISDN line. For example, two external line capture flags are provided if the line is a basic line (2B + D) and 23 if the primary line is (23B + D). The control may be performed for each B channel.

[Effects of the Invention] As described above, according to the present invention, when a call is made to the digital network, the digital network line is not captured until the dial signal is transmitted and the call signal is transmitted to the digital network. Therefore, even if an external key is operated to make a call to the digital network line, the call may be received from the digital network until the outgoing signal is transmitted to the digital network. If the user attempts to make a call by operating the outside line key, the predetermined display provided by the outside line display is canceled in response to the operation of the outside line key, so that the user is trying to make a call. Since there is an incoming call, it is possible to reliably notify the user that the outgoing call has been interrupted.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing the configuration of a switching system in this embodiment, FIG. 2 is a diagram showing the appearance of a dedicated telephone in this embodiment, and FIG. 3 is a flowchart showing a control procedure in this embodiment. . In the figure, A0: main unit, A1: ISDN line, A2: ISDN trunk circuit, A3: transmission line switch circuit, A4: CPU, A5
…… ROM, A6 …… RAM, A7 …… Interface circuit, A8, A
9… Extensions, A10, A11… Dedicated telephones.

Claims (1)

(57) [Claims] 1. A method for controlling an external line indicator provided at an extension terminal connected to an exchange, wherein the external line key for designating the digital network line connected to the exchange as an external line is operated. Controlling the external line display to perform a predetermined display, and canceling the predetermined display by the external line display when the external line display is performing the predetermined display at the time of an incoming call from the digital network line. A method for controlling an outside line indicator.