JPS636994A - Push-button telephone system - Google Patents

Abstract

PURPOSE:To inform an individual incoming call from a trunk line to a speaker by a liquid crystal or the like by dialling a special number by a caller when a push-button telephone set corresponding to an extension is busy at the time of the individual incoming call from the central office line. CONSTITUTION:When the relevant push-button telephone set 17 is busy, a main control part 15 outputs busy tone transmission data to a trunk line interface part 11 for the individual incoming call through a bus interface and the trunk line interface part for the individual incoming call transmits the busy tone to the trunk line. Then, a caller transmits the predetermined special number and a call telephone number by an addition dial number for the individual incoming call, thereby, an addition dial number receiving part 14 detects dial data and is inputted to the main control part 15. In such case, the telephone number of the caller is stored in a dial signal memory part 16. The main control part 15 controls a telephone set interface part 13 according to the received dial data, displays the individual incoming call from the trunk line and the telephone number of the caller through the liquid crystal or the like to the busy push-button telephone set 17 and informs to the speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to monitoring of key telephone equipment, particularly to the function of receiving individual calls from a central office line.

2. Description of the Related Art Conventionally, in this type of key telephone device, if the extension line that received an individual call was busy, a busy tone was returned to the central office line.

Problems to be Solved by the Invention The above-mentioned individual call receiving function of the conventional button telephone device has the drawback that if the extension key telephone that received the individual call is busy, the telephone cannot tell whether the individual call is coming from the central office line or not. Ta.

The present invention has been made in view of the above-mentioned conventional circumstances, and
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel key telephone device which makes it possible to overcome the above-mentioned drawbacks inherent in the prior art.

Means for Solving the Problems In order to achieve the above object, the button telephone device according to the present invention includes a telephone interface section that accommodates the connection line of the button telephone, and a central office line interface section that accommodates the central office line for individual incoming calls. , a call path switching unit that connects the communication paths between the interface units, an additional dial signal from the individual incoming station line (PB double signal receiving circuit, a dial signal memory unit that stores the received PR signal value, and the above circuit) As a means to solve the above-mentioned problem, in a button telephone device equipped with a main control unit that controls an individual call from a central office line using a common bus interface, if the extension telephone that receives an individual call from a central office line is busy, the caller By sending out a PB double signal of the special number and self-telephone number predetermined by the system, the signal is detected in the additional dial signal receiving circuit of the button telephone device, and the main control unit reads the signal value using the common bus interface. - The dial signal is stored in the dial signal memory section, and has a function of displaying the presence of an individual call from the central office line and the caller's telephone number to the key telephone via the telephone interface section.

EXAMPLE Below, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Referring to FIG. 1, one embodiment of the present invention includes an individual incoming office line interface section 11 and a communication path switching section! 2, telephone interface section 13 and additional dial signal receiving section 1
4, a main control section 15, a dial signal memory section 16,
It is equipped with a button telephone 17.

Next, the operation of one embodiment of the present invention will be explained based on FIG.

Incoming calls from the office line are received by the individual office line interface section 11.
When detected, the individual incoming station line interface section 11
outputs individual incoming call detection data to the main control unit 15, and also sends a tone to the central office line to prompt additional dialing for individual extension calls. The main control section 15 controls the communication path switching section 12 to connect the communication path between the individual incoming office line interface section II and the additional dial signal reception section 14 .

Next, the additional dial signal (PB double signal) from the office line is detected by the additional dial signal reception ff114, and the main control unit 15
is entered as dial data. The main control unit 15 is
Based on the dial data, the telephone interface unit 13 is controlled to detect whether the key telephone 17 corresponding to the dial data is idle or busy. At this time, if the corresponding key telephone 17 is busy, the main control section 15 becomes the individual incoming office line interface section! Busy tone (BT) transmission data is outputted to the bus interface 1, and the individual receiving office line interface unit 11 sends out the busy tone to the office line. Then, when the caller sends a PR double signal with the special number and calling telephone number predetermined by the system, the additional dial signal receiving section 14 detects the dial data in the same manner as described above and inputs it to the main control section 15. . The calling party's telephone number is then stored in the dial signal memory section 16.

The main control unit 15 controls the telephone interface unit 3 based on the received dial data, and displays on a liquid crystal display, etc., the fact that the busy button telephone 17 has received an individual call from the central office line and the telephone number of the caller. , it becomes possible to notify the speaker.

As described in detail, according to the present invention, when an individual call is received from a central office line and the corresponding key telephone of the extension is busy, the caller can call a special number predetermined by the system. By dialing, it is possible to inform the speaker of the incoming individual call from the central office line and the caller's telephone number on the corresponding button telephone on the liquid crystal display or the like.

[Brief explanation of drawings]

FIG. 1 is a book configuration diagram showing an embodiment of the present invention. Il, , individual incoming station line interface section, 12
000 communication path switching unit, 13. , , telephone interface section, +4. , , additional dial signal receiving section, 15
゜0. Main control section, 1B, , dial signal memory section, +7. , , button telephone

Claims (1)

[Claims] A telephone interface unit that accommodates the connection line of the key telephone, a central office line interface unit that accommodates the central office line for individual incoming calls, a call path switching unit that connects the communication paths between the respective interface units, and one that connects the individual incoming calls from the central office line. an additional dial signal receiving circuit that receives a credit additional dial signal (PB signal);
a dial signal memory unit that stores the received PB signal value;
and a main control unit that controls each of the circuits through a common bus interface, and receives an additional dialing signal after detecting an incoming call from a central office line, and calls the corresponding extension within the key telephone device; When the relevant extension is busy, by dialing the special number predetermined by the system from the central office line using a PB signal and then dialing the calling party's telephone number, an individual call will be displayed on the LCD of the button telephone with display for the relevant extension. A button telephone device characterized in that it includes a function capable of displaying a telephone number dialed from the central office line side.