KR0168011B1 - Dtmf forwarding method using switch board - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

It is a technology that relays DTMF signals after converting an incoming call to a specific trunk line using a relay station connected to a private exchange system.

2. Technical problem to be solved by the invention

After making a call to a private exchange, when a call is requested with a particular CO liner, the trunk line connected to the private exchange automatically switches to CO and sends the DTMF entered by the CO line to the CO line.

3. Summary of Solution to Invention

When an external CO subscriber wants to switch to a specific CO phone number by calling a private exchange, the automatic relay station connected to the private exchange sends a message for CO conversion and inputs a CO conversion signal from the external CO subscriber. Automatically switch to specific trunk line and receive service code to receive desired service and relay DTMF signal to be sent to specific trunk line.

4. Important uses of the invention

Applies to auto attendant connected to private exchange.

Description

DTMF relay method after trunk line switching

1 is a connection diagram of a system for trunk line switching in a relay station according to the present invention.

2 is a block diagram of an automatic repeater according to the present invention.

3 is a control flowchart for switching trunk lines according to an embodiment of the present invention.

4 is a manufacturing flowchart for relaying a DTMF signal after trunk line switching according to the present invention.

The present invention relates to a DTMF relay method among services after trunk line switching at a transit station, and in particular, corresponds to a desired service code inputted by an external station subscriber after switching a call to a specific trunk line desired by an external station subscriber at a relay station connected to a private exchange. The present invention relates to a DTMF relay method for detecting a DTMF signal and dialing the detected number to a specific trunk line, and relaying the DTMF signal so that external subscribers can receive a desired service.

In general, the auto attendant connects to a private exchange or key phone system or sends a response message to a counterpart in response to a call from a CO line, and recognizes the number input from the CO line and automatically switches the call to the corresponding station. Device. By the way, the conventional automatic repeater accepts a call from the outside to switch to the extension, the extension number table is also allowed only 3 to 4 digits. However, due to the increasing demand for various services, the company and the financial industry provide a variety of services to customers, and in order to provide such services, customers must dial a separate phone number to receive service or call a service telephone number. I couldn't get the service if I didn't recognize it.

Therefore, after the CO line from external subscribers is automatically switched to a specific CO line using a relay station connected to the private exchange, the external CO subscriber enters the service code to receive the service from the CO. If the CO line is an automatic response system of a financial institution, the balance check can be performed by the external CO line subscriber. At this time, when the external subscriber's phone is far away from the exchange, the foreign subscriber can enter the desired service code and send it to the specific trunked line. There was a problem that you could not recognize the DTMF level or receive other services that you do not want.

Accordingly, an object of the present invention is to convert a call automatically received from a relay station connected to a private exchange to a specific trunk line, and then recognize the DTMF signal inputted by the subscriber to be sent out to the specific trunk line to repeat the DTMF step. In providing.

In order to achieve the above object, the present invention provides a process of performing a CO line conversion to a specific CO line when a ring signal is received and a CO line selection selection digit is received, and when the DTMF signal input by an external CO subscriber is received after the CO line conversion. Characterized in that the process of transmitting the DTMF step received to the particular trunk line to the trunk line switch.

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

1 is a connection diagram of a system for trunk line switching in a relay station according to the present invention,

The private exchange 102 is connected to the local exchange 100, the relay station 104 is connected to the private exchange 102, and receives the incoming signal from the relay station 104 to control the extension and the trunk line. In addition, a specific national line is separately connected to the local exchange 100 for a specific service.

2 is a block diagram of an automatic repeater according to the present invention,

The central processing unit 20 detects a ring incoming call, outputs a voice message generation control signal, and detects a DTMF signal received to control trunk line switching. The line interface unit 22 is connected to the trunk line and the station through a plurality of ports, and processes the interface to ring signals, tone signals, and call voice signals received from the trunk line and the station. The switching unit 24 connects the signals by the control of the CPU 20. The ring detector 26 detects a ring signal received through the line interface unit 22 and outputs the ring signal to the CPU 20. The codec 32 converts an analog voice signal input through the line interface unit 14 into a digital signal and outputs it to the voice processing unit 28, and converts the digital voice signal into an analog voice signal and outputs it to the switching unit 24. do. The voice storage unit 30 stores the automatic response message and the guidance message. The voice processing unit 28 synthesizes and outputs the automatic response message and the guidance message stored in the voice storage unit 30 under the control of the central processing unit 20 into voice signals. DTMF transmission and reception unit 34 is connected to the switching unit 24 and the central processing unit 20 converts the DTMF step received through the switching unit 24 to digital data and outputs to the central processing unit 20, The digital data output from the central processing unit 20 is converted into a DTMF (Dual Tone Multi-Frequency) signal and transmitted to the switching unit 24.

3 is a control flowchart for switching trunk lines according to an embodiment of the present invention,

4 is a control flowchart for relaying a DTMF signal after trunk line switching according to the present invention.

The operation of the preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 described above.

When the external trunk subscriber calls the trunk line subscriber number connected to the private branch exchange 102 through the private branch exchange 100, the automatic trunk line 104 detects a ring signal to switch the trunk line when there is a trunk line transfer request from the external trunk subscriber. Referring to FIGS. 3 and 4, in operation 201, the CPU 20 detects the number of times a ring signal is set from the ring detector 26 through a corresponding port among a plurality of ports port 1-port n. If the ring signal is detected a predetermined number of times, the flow proceeds to step 202. In step 202, the central processing unit 20 controls the line interface unit 22 to form a communication path, and then controls the switching unit 24 and the voice processing unit 28 to transmit an automatic response and a guide message. The auto answer and guide message is a message for an external subscriber to enter an extension number or a specific number using a dial key. At this time, the external station subscriber receives the auto-answer and guide message and presses the dial key for the corresponding number. Then, in step 203, the central processing unit 20 checks whether a digit is detected from the DTMF transmitter / receiver 34, and proceeds to step 204 when the digit is detected. In step 204, the central processing unit 20 checks whether the digit received from the DTMF transmitter / receiver 34 is an extension number related digit. In this case, if the digit is related to the extension number, the process proceeds to step 205 and the received digit occupies the empty port of the relay station, and the received digit switches to the corresponding extension subscriber. However, if it is not the digit related to the extension number in step 204, the flow proceeds to step 206 and the digit received from the DTMF transmitter / receiver 34 checks the trunk line switching related digit. In this case, if the received digit is not the digit related to the trunk line switching, the process proceeds to step 208 to service a function corresponding to the received digit. However, if the received digit is a trunk line transfer related digit, the process proceeds to step 207 to switch the trunk line.

Referring to the trunk line switching subroutine to switch the trunk line in detail in Figure 4, in step 401 the central processing unit 20 checks whether there is an empty port of the automatic repeater 104, and if there is no empty port in step 402 Proceed. In step 402, the central processing unit 20 controls the voice processing unit 28 to send a voice message indicating that the call is stored in the voice storage unit 30 through the switching unit 24, and then the line interface unit 22. ) To cut the call line.

However, if there is an empty port of the automatic repeater 104 in step 401 proceeds to step 403 through the DTMF transmission and reception unit 34 and the switching unit 24 and the line interface unit 22 for dialing lines to catch the trunk line It sends out to the private exchange 102. Then, in step 404, if there is no empty trunk line, if there is no empty trunk line, the process proceeds to step 402, and transmits a voice message that is in a call through the switching unit 24, and then controls the line interface unit 22 to make a call line. To cut. However, if there is an empty trunk line in step 404, the dialing is performed through the DTMF transmitter / receiver 34 with a specific trunk line number connected to the trunk line C.03 of the trunk line exchange 100 stored in the memory by occupying the trunk line. In this case, the specific trunk line number stored in the memory should be stored in advance in the memory. Then, in step 406, the central processing unit 20 controls the switching unit 24 to connect the call path between the external trunk line subscriber and the specific trunk line. For example, if an external local subscriber is called and connected to private exchange 102 through the local exchange C.01, and connected to the relay station 104 through port port1, the relay station 104 may connect to the private exchange through port port2. It occupies the trunk line C.02 connected to 102) and calls the trunk line C.03 of the local exchange 100 to connect the call path between the external trunk line subscriber and the specific trunk line. After the trunk line is switched by the trunk line 104 and the call path is connected, the central processing unit 20 checks whether the DTMF signal input by the external trunk subscriber is received from the DTMF transmitter / receiver 34 in step 407. If not, proceed to step 410.

When the DTMF signal is received in step 407, the received DTMF signal is transmitted to the specific trunk line C.03 through the DTMF transmitter / receiver 34 via the switching unit 24 and the line interface unit 22. The external CO subscriber can receive the service contents corresponding to the DTMF provided from the specific CO line, for example, the balance inquiry or the stock market inquiry. Then, in step 409, the external subscriber checks whether the phone is boiled. At this time, when the external trunk subscriber boils the phone, the relay station 104 detects a busy tone transmitted from the national exchange 100. If the foreign subscriber subscribes to the call, proceed to step 410. In step 410, the central processing unit 20 controls the line interface unit 22 to cut the communication path and go to the idle state.

As described above, the present invention receives the call signal from the external trunk subscriber in the automatic repeater connected to the private exchange, converts the trunk line to a specific trunk line, and then transmits the received DTMF signal to the specific trunk line when the DTMF signal is received from the external trunk subscriber. Since the DTMF signal is relayed, external subscribers who are remote from the exchange can also receive the desired service from the specific trunk line accurately, and the service can be prevented from being interrupted due to the DTMF's disregard.

Claims (4)

In the DTMF relay method after the CO line is switched at the relay station connected to the private exchange, the process of CO line switching to a specific CO line when the ring signal is received and the CO line selection selection digit is received, and the DTMF input by the external CO line subscriber after the CO line conversion DTMF relay method after the trunk line switching using a trunk line characterized in that the step of transmitting the received DTMF signal to the specific trunk line to the trunk line switching when the signal is received. The method of claim 1, wherein the trunk line switching process includes: searching for an empty port of the relay station when the trunk line selection digit is received, and transmitting a guide message indicating that a call is in progress when there is no empty port of the relay station; Cutting a telephone line, and if there is an empty port of the relay station, dialing a stored specific trunk line number occupying a trunk line connected to the private exchange, and after the dialing, the external trunk line subscriber and the specific trunk line Trunk line switching method using a relay station characterized in that the process consisting of connecting the communication path between. 3. The trunk line switching method according to claim 2, wherein the automatic response and guide message is a message for inputting a trunk line selection selection digit. In the DTMF relay method after trunk line switching using a relay station connected to a private exchange, a process of transmitting an automatic relay station and a guide voice message when a ring signal is detected, and a process of receiving a switch selection digit after transmitting the voice message And converting the incoming signal to a specific trunk line when the received switch selection digit is a digit related to a trunk line number; and when the DTMF signal input by an external trunk line subscriber is received after the trunk line transition, the received DTMF signal is trunked. DTMF relay method after the trunk line switching using the trunk line characterized in that the process of transmitting to the specific trunk line converted.