JPH0364194A - Key telephone system - Google Patents

Abstract

PURPOSE:To discriminate a busy key telephone set even without interrupt talking by devising the set such that an extension number of a busy key telephone set is displayed on a display section of other key telephone set going to make a call when there is the busy key telephone set acquiring already a trunk line. CONSTITUTION:The information for selecting and operating a trunk line by a key telephone set (b) for making a call is inputted to a common control circuit 4 and the operating state of the selected trunk line is inquired for a trunk line collation circuit 8. When the trunk line is busy, the information representing the busy state is returned and an extension number stores circuit 9 is started. The extension number storage circuit 9 stores the trunk line number (a) and the extension number (b) of the busy key telephone set corresponding to each other, reads the extension number of the relevant key telephone set is read and the read extension number is sent to the common control circuit 4. The common control circuit 4 sends the extension number to the key telephone set (b) making a call through a data transmission circuit 3 and a telephone set connection circuit 2 and displays it onto a display section 10. Thus, the telephone number of the busy extension telephone set is recognized without interrupt talking.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a key telephone device having a function of displaying the telephone number of a key telephone that is acquiring one station line on other key telephones.

(Prior Art) FIG. 4 is a block diagram schematically showing a conventional key telephone device, where L is a central office line, a is a key telephone main device (hereinafter simply referred to as main device), and b is a key telephone. Multiple button telephones belong to main device a.

A call connection can be made by selecting one of one or a plurality of office lines via the main device a.

When a central office line key is selected and pressed on the key operation section 1 of a button telephone to make a central telephone call, the transmission information is input from the telephone connection circuit 2 to the data transmission circuit 3 to the common control circuit 4. As a result, the common control circuit 4 sends an audible tone, generally called a busy tone, to the key telephone that made the call, if the selected central office line has already been captured by another key telephone and is in use. This signal is sent to notify that the selected station line is busy. In addition, in Fig. 4, 5 is the station line circuit, and 6 is the station line circuit.
is a call connection circuit, and 7 is a call circuit.

(Problem to be Solved by the Invention) As described above, the conventional key telephone device has a function of sending a busy tone to the calling key telephone to warn when one selected central office line is in use. However, there is no way to know what extension number the key telephone that is using the central telephone line is, and the only way to find out is to make an interrupt call using a special dialing operation, which inconveniences the other party. I was playing.

SUMMARY OF THE INVENTION In view of the above-mentioned problems with conventional key telephone devices, it is an object of the present invention to provide a key telephone device capable of knowing the number of an extension telephone in use without making a single-interruption call.

(Means for Solving the Problems) The present invention provides a key telephone main device that connects to one or more central office lines to make a call connection, and a plurality of button telephones that connect to the central office lines via this main device. In order to accomplish the above-mentioned purpose in a telephone device, a button telephone main device is provided with an extension number storage circuit that stores the extension numbers of the key telephones belonging to the key telephone device along with known central office lines, a central office line verification circuit, and a button Means is provided for activation by the acquisition of a central office line by the telephone; on the other hand, the button telephone is provided with a telephone number display section to indicate that the central office line selected by any button telephone for making a call has already been seized by another button telephone; If there is
This is achieved by displaying the extension number of the key telephone with the above value on the display of the key telephone that made the call.

(Function) According to the present invention, if there is a key telephone that has already acquired a central office line and is in the middle of a call, its extension number is displayed on the display section of the other key telephone that is attempting to make a call. Therefore, without having to make an interrupt call as in the past, it is possible to know which key telephone is busy and determine whether an interrupt is necessary, thereby avoiding causing any inconvenience.

(Example) Hereinafter, the present invention will be explained by examples using the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
Reference numeral 8 is a central office line checking circuit, 9 is an extension number storage circuit, and other symbols are the same as those in FIG. 3, or have the same functions and operate in the same manner. That is, when a central office line call is made by selecting and pressing the central office line key from the key operation section 1 of the button telephone, the central telephone selection information is transferred to the telephone connection circuit 2 of the main device a. The data is transmitted to the common control circuit 4 via the data transmission circuit 3.

Thereby, the common control circuit 4 verifies the usage status of the office line with the office line verification circuit 8. 1. If the selected office line is vacant, information indicating that the office line is vacant is returned.

The common control circuit 4 activates the office line circuit 51 and the call connection circuit 6 to connect the office line and the key telephone, and the voice from the office line passes through the telephone connection circuit 2 to the call circuit 7 of the key telephone. The data is transmitted and calls can be made.

When the button telephone above is pressed and the selected central office line is captured and used by another button telephone, the operation is as follows:
As shown in the flowchart of FIG. 2, the information that the button telephone has selected the central office line for making a call is input to the common control circuit 4 in the same way as described above, and the usage status of the central office line selected by the button telephone is determined as follows. When the central office line verification circuit 8 detects that the central office line is in use, step (hereinafter abbreviated as S) 1, information indicating that the central office line is in use is returned, and the extension number storage circuit 9 is activated (S2). , this extension number storage circuit 9 stores the office line number a and the extension number of the key telephone being used in correspondence, as shown in FIG. 3, each time the office line is used.
Thereby, the extension number of the corresponding key telephone is read (S3), and the read extension number is sent to the common control circuit 4.

The common control circuit 4 sends the extension number sent from the office line matching circuit 8 via the data transmission circuit 3 and the telephone connection circuit 2 to the button telephone that made the call (S4), and displays the extension number on the display section 10 provided therein. Display number (S5)
.

In other words, in the present invention, as described above, the extension number stored in the extension number storage circuit 9 is displayed on the display section 10, so that the caller can already know what number the button telephone is using the central telephone number. You can find out if there is. Therefore, the caller has to decide whether to forcibly interrupt the central office line and make the call, or to seize another central office line and make the call.

(Effects of the Invention) As is clear from the above explanation, the present invention makes it possible to know the extension telephone number of a key telephone that is in use without interrupting the office line in use. Therefore, depending on the content of the call, if you do not interrupt the call, you can avoid bothering the other party.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is an operation flowchart, FIG. 3 is an auxiliary diagram for explanation, and FIG.
The figure is a block diagram showing the configuration of a conventional key telephone device. a...Button telephone main device! (main device), b...button telephone, L...office line, 1...key operation unit, 2...telephone connection circuit. 3...Data transmission circuit, 4...Common control circuit, 5
... Office line circuit, 6 ... Call connection circuit, 7.
...Telephone circuit, 8...Station line verification circuit, 9...
Extension number storage circuit. IO...display section.

Claims (1)

[Claims] In a button telephone device consisting of a button telephone main device that connects to one or more central office lines to make a call connection, and a plurality of key telephones that connect to the central office lines via this, the key telephone main device An extension number storage circuit that stores the extension number of the button telephone together with the office lines that it knows, an office line verification circuit, and a means for activating them by the acquisition of the office line of the button telephone. The telephone set is equipped with a telephone number display section, and if the central office line selected by any button telephone set for making a call is already captured by another key telephone set, the above-mentioned other number will be displayed on the display section of the key telephone set that made the call. A button telephone device characterized by a configuration that displays an extension number of the button telephone.