JPH09116628A - Stop method of hold call of simple exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release speech connection automatically in the case that speech is released from an opposite party during holding of a main wire. SOLUTION: When a main wire is in holding by a holding operation of an extension telephone set in speech connection in the step 101, a holding tone transmission section sends a holding tone to the main wire in holding in the step 102. Then a tone signal of the main wire is checked in the step 103, and when the speech is released by hanging up the telephone of a caller in the step 104, a generated error tone is checked. When the error tone is detected, the program is advanced to the step 105, the main wire connection is released and the holding display indicated by a blinked LED in each extension telephone set is stopped and the program is finished without generating a holding re- incoming call signal.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a simple exchange system (K
Call control in EY-PHONE SYSTEM).

[0002]

In the conventional simple exchange system, when the caller side hangs up the call or the call is released while the call is on hold due to extension transfer or the like, the extension subscriber or It is surprisingly inconvenient for the switch to disconnect the line only when the operator hears the error tone (busy tone) and operates it. Therefore, the present invention provides a method for canceling a held call in a simple exchange system which automatically releases a call connection in such a case.

[0003]

To this end, according to the present invention, as a hold call canceling method of a simple exchange system when a call is released while a station line is on hold, a hold operation is performed on an extension connected to a call. The process of putting the station line on hold and sending out the holding tone, the process of inspecting the station line tone signal while sending the holding tone to detect an error tone, and releasing the station line connection when an error tone is detected, Provided is a method of canceling a held call, which comprises performing a process of canceling a call function supported by an extension. In the process of canceling the call function supported by each extension, hold re-call, transfer re-call, and hold display are canceled.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

FIG. 1 is a block diagram showing a schematic configuration of a simple exchange system. The central processing unit 10 supervises the overall control of the simple switching system, and in the present embodiment, when the line tone is detected from the line and an error tone is confirmed on the line on hold, the line disconnection is released. Signal, stop signal for hold display such as blinking LED indicating hold, and hold reca
ll) and a function to generate a stop signal for transfer recall. The memory unit 20 has a built-in program for canceling a call by detecting a pending error tone, and temporarily stores data generated during execution of the program. In addition, hold re-call is a function to notify by issuing a confirmation tone (confirm tone) when a user who has held an office line (or extension) does not perform re-call (= hold cancellation). It indicates the function to perform the same operation as hold re-call when the call is held.

The office line interface circuit 30 captures the office line under the control of the central processing unit 10 to form a communication loop, and transmits / receives a signal to / from the office line. The switching circuit 40 switches various tone signals and voice data under the control of the central processing unit 10 and distributes them to each unit. The central office tone detector 50 exchanges signals with the switching circuit 40 under the control of the central processing unit 10 to detect and generate various tone signals. The extension interface circuit 60 supplies a call current in the voice band to the extension subscribers (EXTENSION) and simultaneously serves as an interface between the subscribers. The hold sound sending unit 70 sends a hold sound such as a melody to the holding station line when an extension subscriber performs a holding operation under the control of the central processing unit 10.

FIG. 2 is a control flowchart for explaining the method for canceling a call on hold according to the present invention. That is, the process of sending the hold tone to the station line in accordance with the hold operation, the process of checking the station line tone signal during the hold tone sending to confirm the error tone, and releasing the station line connection when the error tone is detected. , The process of discontinuing the call function supported by each extension.

The following description will be made assuming that a call between the central office line and the extension subscriber B is formed first. In step 101, when the extension line is put on hold by the holding operation of the extension telephone after the call line is connected to the extension subscriber B, the central processing unit 10 controls the switching circuit 40 in step 102 to control the station line interface. A holding sound is sent from the holding sound sending unit 70 to the held office line through the circuit 30. Then, in step 103, the central processing unit 10 determines that the central line tone detector 5
Received and inspected the tone signal of the local line detected by 0,
In step 104, an error tone generated when the call is released by the calling side is checked. If an error tone is detected, the process proceeds to step 105, where the central processing unit 10 determines that the central line interface circuit 30
To cancel the station line connection, and stop the hold display by LED blinking supported by each extension telephone and terminate the program without generating a hold re-call signal.

If no error tone is detected in step 104, the process proceeds to step 106, and the central processing unit 10 blinks the LED of each extension telephone, which is a normal service function, with the station line connected, and holds the call again. And processes alarm signals.

[0010]

According to the present invention, when the other party hangs up the telephone line while the line is being held in the simple exchange system and the call is released, a call function such as hold re-call, transfer re-call, and hold display is provided. Since the call is automatically canceled and the call is disconnected, there is an advantage that the efficiency of business can be improved without receiving unnecessary calls.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a simple exchange system.

FIG. 2 is a control flowchart illustrating a hold call canceling method.

Claims (2)

[Claims] 1. A method for canceling a held call in a simple exchange system when a call is released while a line is being held, and when a hold operation is performed on an extension connected to a call, the line is put on hold and a hold tone is output. Process, the process of inspecting the station tone signal during the hold tone transmission to detect the error tone, and the process of releasing the station line connection when the error tone is detected and stopping the call function supported by each extension. And a method for canceling a held call, which comprises: 2. The hold call canceling method according to claim 1, wherein the hold re-call, transfer re-call, and hold display are canceled in the process of canceling the call function supported by each extension.