KR950003722B1 - Autodialing method of pabx - Google Patents

Abstract

The method automatically calls the external subscribers with automatic clienting calling request to improve the service function of telephone. The device includes a central proccessor (1) a memory (2), an interrupt generator (3) which detects the voice source in the constant time interval, a serial input/output port (4) which connects the peripheral device, a system control interface (5), a PCM highway interface (6) which connects the time shared switching circuit to the pulse signal modulation highway, and a voice signal transmit/receiving and detection circuit (8).

Description

Automatic subscriber originating call sending device and method in private exchange

1 is a system control block diagram of an apparatus of the present invention.

2 is a detailed circuit diagram of a dual tone multi-frequency transmission and reception (DIMF) and sound source detection circuit and a codec circuit in FIG.

3 (a)-(c) are time charts of input and output stages of a dual tone multi-frequency transmit and receive (DTMF) and sound source detection circuit.

4 is a flow chart for explaining the method of the present invention.

* Explanation of symbols for main parts of the drawings

1 central processing unit (CPU) 2 memory

3: interrupt generator 4: serial input / output port

5: system control interface 6: pulse code modulation highway interface

7: Codec (Encoder-Decoder) Circuit

8: dual tone multi-frequency transmission, reception and sound source detection circuit

C ₁ , C ₂ : condenser R ₁ , R ₂ : resistance

According to the present invention, when an extension subscriber calls an external subscriber via a CO line, when the extension subscriber requests an automatic call request for a CO line when the external subscriber is busy, the desired extension is automatically called by the external subscriber. The present invention relates to an automatic subscriber originating request device and method in a private exchange.

In a conventional private switching station, an extension subscriber originating apparatus typically includes a central processing unit (CPU) for controlling the entire system, an extension subscriber circuit for interfacing the subscriber with the system, and voice information and control information through the extension and trunk line interfaces. Switching circuits for switching, trunk line subscriber circuits for interfacing the system (telephone station) with the system, and various tone signals required for the system are stored as digital data, and sound is generated to supply subscribers with appropriate pitches whenever necessary. An adjusting circuit and a ring generating circuit for generating a ring signal are provided, and the extension subscriber calling method in the conventional apparatus made as described above is as follows.

That is, when any station among station subscribers in the subscriber circuit selects the trunk line of the trunk line subscriber circuit to perform the trunk line transmission signal or completes the trunk line transmission and wants to perform the trunk line redial without releasing the trunk line currently in use. The extension subscriber could receive the CO line redial service by dialing the number button for redialing designated by the private exchange system that set up the hook flash.

However, such a conventional extension subscriber calling device and calling method incorrectly dials while executing a calling function transmitted by a subscriber through a private exchange, or when a subscriber wants to talk to another trunk subscriber after completing a call with a subscriber. While there is an advantage that the CO line can be redialed while holding the handset and the receiver, when the subscriber line is busy, you have to redial the handset while holding the handset or the handset. There was a cumbersome problem in using it.

The present invention has been proposed in order to solve the above-mentioned problems. When the CO line subscriber is in a call, an automatic request originating code is registered, and when a call is detected by occupying the CO line drink after waiting for a predetermined time, the registered request outgoing signal is registered. If you do not detect the dial tone, wait for a certain time and check the number of re-sends, and if the set number of re-sends is not exceeded, occupy the trunk of the trunk line again. It is an object of the present invention to provide an apparatus for transmitting an automatic extension of subscribers in a private exchange to send a sound source, and a method thereof. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the apparatus of the present invention includes a central processing unit 1 and a memory 2 for controlling overall system operation, and an interrupt generator 3 for generating an interrupt to detect a sound source at regular time intervals. ), Serial input and output ports (4) for connecting to peripherals so that the operating status can be checked on a computer monitor, system control interface (5) for interfacing with a private exchange, and time-division switching of a private exchange. Decodes and encodes the PCM highway interface 6 and the PCM signal transmitted and received by the PCM highway interface 6 so that they can interface with each other on a circuit and pulse code modulation (PCM highway). Can transmit and receive a codec signal 7 and a dual tone multiple frequency (hereinafter referred to as DTMF) to detect a sound source. It is provided with a double-source multi-frequency transmitting and receiving sound and the detection circuit (8) is as claimed.

In addition, the method according to the present invention registers an automatic request originating code of an extension subscriber when a CO line subscriber is in a call, waits for a predetermined time, and then re-schedules if the 'call tone' is not detected by occupying the trunk of the CO line. After waiting for a time, the number of times the automatic request originating code is registered is determined, and if the number of times the automatic request originating code has not elapsed, the 'call tone' is detected by occupying the trunk trunk until the set number is reached. A first step of sending a sound source indicating that the automatic request was not performed to the caller who applied for the automatic request when the CO line subscriber was busy until the set number of automatic request transmissions were exceeded; If the 'calling tone' is detected again after the automatic request originating code is registered, the registered digit data is transmitted, and then the 'calling tone' of the CO line subscriber is detected again, and the 'calling tone' is not detected. It is executed in the same way as the routine for judging the number of outgoing calls.If the 'calling sound' of the CO line subscriber is detected, it is waiting until the hook switch of the CO line is turned off. It is characterized in that the second step of notifying that the subscriber has been called and the automatic subscriber request for the extension request to notify that the CO line subscriber is called, the call is made and terminates the automatic request transmission function.

Referring to the effects of the present invention made as described above with reference to FIGS. 1 to 4 as follows.

That is, when the PCM signal modulated from the pulse code modulator of the private exchange not shown as shown in FIGS. 1 and 2 is applied to the PCM receiving end DR of the codec circuit 7 as a digital signal, the input PCM signal Is decoded analog by a decoder in the codec circuit 7 and applied to the input terminal Din of the DTMF transmission, reception, and sound source detection circuit 8 through the capacitor C ₂ of its output terminal VFRO.

In this way, the signals decoded from the analog signals are hexadecimal encoded by the DTMF transmission, reception, and sound source detection circuit 8 as shown in FIG. 3A. Then, it is determined whether their digital outputs are valid or invalid, and the valid data ( D ₀ -D ₃ ) are stored in the memory 2.

단이 '하이'레벨 상태에서 '로우'레벨 상태로 변환될 때 상기 16진수로 부호화된 데이타가 내부적으로 래치되어 DTMF 음원을 발생하고, 리세트 단자(RST)가 '로우'레벨 상태에서 '하이'레벨 상태로 되면 DTMF 음원 발생을 중지한다.At this time, as shown in (b) of FIG. 3, in the DTMF generation process, the input data D ₄ -D ₇ stored in the memory 3 are latched by the DTMF transmission, reception, and sound source detection circuit 8.

When the stage is converted from the 'high' level state to the 'low' level state, the hexadecimal coded data is internally latched to generate a DTMF sound source, and the reset terminal RST is 'high' level state. When the level is reached, the DTMF sound source is stopped.

The DTMF sound source generated in the above-described process is output to the codec circuit 7 through the capacitor C ₁ and the resistor R ₁ of the output terminal Dout, and the output DTMF sound source is again digitally generated by the codec circuit 7. The signal is converted into a signal and output through the PCM transmitter (Dx).

In addition, the analog signal input to the other input terminal (LIN) of the DTMF transmission, reception, and sound source detection circuit 8 detects the sound source according to the frequency corresponding to the call processing signal as shown in FIG. It is output through its detection terminal DET.

In the present invention related to the apparatus operated as described above, as shown in FIG. 4, if the subscriber is dialed and the subscriber is not busy and is waiting for a call after the extension subscriber dials the trunk line, a call is made between the subscriber and the subscriber. If the CO line subscriber dialed by the extension subscriber is busy, register the dialed automatic request originating code, wait for a predetermined time, and occupy the trunk trunk.

If the 'call tone' of the CO line subscriber is not detected while occupying the trunk line trunk, wait again for a predetermined time period, and then check the number of times the automatic request originating code is registered. Returning to the mode, the process is repeated until the set number of transmissions is exceeded.

As described above, if the CO line subscriber continues to talk until the set number of return times is exceeded, the caller who applied for the automatic request, that is, the extension subscriber, notifies the sound source that the automatic request was not performed and terminates the automatic request transmission function.

On the other hand, when the automatic call request is attempted again and the 'ring tone' is detected, the automatic request originating code transmits the registered digit data and detects the 'call tone' which notifies the extension subscriber of the call signal being sent to the trunk line subscriber again.

If the 'calling sound' is not detected in the detection process, the process is repeated in the same manner as the process of determining the number of automatic request transmissions. If the 'calling sound' of the CO line subscriber is detected, it waits until the hook switch of the CO line subscriber is turned off. When the hook switch of the CO line subscriber side is turned off, the CO line subscriber is notified that an outgoing call was made by the extension subscriber, and the station subscriber who applied for the automatic request is notified that the CO line subscriber has been called, and then the call is made between the CO line and the subscriber. At the same time, the automatic request transmission function is terminated.

As described above, according to the present invention, when an extension subscriber makes a call with an external barometer through a trunk line, the conventional inconvenience of using the telephone line repeatedly dialed when the subscriber is busy can be solved. Simply by making an outgoing application, you can automatically call external subscribers, thereby improving the service function of the phone.

Claims (2)

The central processing unit (1) and the memory (2) for controlling the overall system operation, the interrupt generator (3) for generating interrupts for detecting sound sources at regular time intervals, and the operation status can be checked on a computer monitor. Serial input and output ports (4) for connecting to peripheral devices, a system control interface (5) for interfacing with a private exchange, and a time-division switching circuit and pulse code modulation hiware for the private exchange. A PCM highway interface 6, a codec signal 7 for decoding and encoding a PCM signal transmitted and received at the PCM highway interface 6, and a dual sound source can transmit and receive multiple frequencies and detect a sound source. Station subscribers in a private switchgear, characterized by a dual sound source multi-frequency transmission, reception and sound source detection circuit (8). The commissioning device. If the CO line subscriber is in a call, the automatic call origination code of the extension subscriber is registered, waits for a certain time, and if the 'call tone' is not detected by occupying the trunk of the trunk, waits for a predetermined time, and then the automatic call origination code is registered. Determining the number of times, if the number of times has not elapsed, occupies the trunk trunk trunk until the set number of times is reached, detects a 'ring tone', and automatically makes a call when the trunk line subscriber is busy until the set number of automatic requests is exceeded. A first step of sending a sound source indicating that the automatic request has not been performed to the sender who applied for the request; If the 'calling tone' is detected again after the automatic request originating code is registered, the registered digit data is transmitted, and then the 'calling tone' of the CO line subscriber is detected again, and the 'calling tone' is not detected. It is executed in the same way as the routine for judging the number of outgoing calls.If a 'call tone' is detected by the CO line subscriber, it waits until the hook switch of the CO line is turned off, and the hook switch of the CO line is turned off and the outgoing call automatically requested to the CO line subscriber. The automatic subscriber station request from the private exchange, comprising the second step of notifying that the subscriber has been called and notifying the extension subscriber that the trunk line subscriber has been called and then making a call and terminating the automatic request origination function. Way.

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