KR910002911B1 - Accounting method by tone detector in pabx - Google Patents

Abstract

The method detects the state of the stationary line using a tone detector to calculate the effective communication time so that the exact charge according to the communication time is charged. The method comprises a step for storing the phone numbers received sequentially and transmitting them to the stationary line, a step for checking the ring back tone from the receiver a step for checking the line-busy state, and a step for calculating the charge according to the communication time and the kind of call. When the ring back tone is ended, the controller regards the its time as the starting time. And the hook-on time is regarded as the communication quitting time when the busy line signal is transfered.

Description

Charging Method of Private Exchange System

1 is a block diagram of a conventional electron exchange system.

2 is a conventional charging flowchart.

3 is a block diagram of an electronic exchange system for carrying out the present invention.

4 is a flow chart of the present invention.

* Explanation of symbols for main parts of the drawings

1: subscriber circuit 2: MPU

3: memory 4: complex frequency receiving circuit

5: complex frequency generating circuit 6: time generating circuit

7: switching circuit 8: trunk line circuit

9: tone detection circuit

The present invention relates to a charging method of a simple electronic switching system, and more particularly, to a charging method using a tone detection circuit.

In general, private and premises simple electronic exchange system (hereinafter referred to as exchange system) is installed in public facilities such as public, fraudulent companies, hotels, etc. As the industry is advanced, the traffic of users is increasing.

The conventional charging method of the electron exchange system as described above is as follows.

1 is a block diagram of an exchange system for performing the conventional charging method of FIG. 1, comprising: a subscriber circuit 1 for supplying a call current to an extension subscriber's telephone and interfacing between the exchange system and the telephone; A microprocessor unit (MPU) 2 that controls call switching and provides various services, a program for initializing call and various functions, initial service data, and a ROM. And temporarily processing the processing data as a data processing area, converting the digital data into digital data by converting the memory 3 consisting of RAM and the Dual Tone Multi Frequency (DTMF) signal generated from the telephone subscriber. A composite frequency reception circuit 4 for outputting the MFF, a complex frequency transmission circuit 5 for converting and outputting a DTMF signal from the digit data output from the MPU 2, The time generation circuit (clock chip) 6 which generates the ash time and outputs it to the MPU 2, and various tone and voice data are switched under the control of the MPU 2, and the call path A switching circuit 7 for forming a circuit and a CO line under the control of the MPU 2 to form a CO line loop, and exchange signals and data coming from the CO line. And a trunk line circuit 8 for interfacing therewith.

Referring to the operation of the switching system having the above configuration, first, if any subscriber (STN) to the hook-off (hook-off), the subscriber circuit 1 recognizes this and informs the MPU (2). The MPU 2 then controls the switching circuit 7 and a tone generator (not shown) to supply an internal dial tone to the subscriber STN. At this time, when the subscriber (STN) hears the dial tone and dials a digit for the CO line, the MUP (2) is received through the path of the subscriber circuit (1), switching circuit (7) and composite frequency reception circuit (4). The digit data is analyzed and the trunk line circuit 8 is controlled to check whether there is an idle trunk. At this time, if there is no empty trunk line, the switching circuit 7 and the tone generator are controlled to supply the busy tone to the subscriber STN. However, when there is an empty trunk line, the MPU 2 controls the trunk line circuit 8 to scour the empty trunk line and at the same time controls the switching circuit 7 to establish a call path between the trunk line circuit 8 and the subscriber circuit 1. To form. Therefore, the CO line tone generated from the local exchange is supplied to the subscriber (STN).

At this time, when the subscriber STN dials, the DTMF signal by dialing is supplied to the composite frequency reception circuit 4 through the subscriber circuit 1 and the switching circuit 7. Then, the complex frequency receiving circuit 4 converts the DTMF signal into digital data by converting the digital data into the MPU 2, and the MPU 2 stores the digital data in the memory 3 and at the same time, the complex frequency generating circuit. Output as (5). The complex frequency generating circuit 5 then converts the received data into a DTMF new circuit, which is applied to the local exchange side by means of a transmission line through the switching circuit 7 and the trunk line circuit 8.

In the above case, the subscriber STN is an electronic telephone, and the local exchange shows an operation process in the case of an electronic exchange. However, if the subscriber (STN) is a mechanical telephone, the MPU 2 analyzes the dialing data by counting the dial pulses through the subscriber circuit 1, and, if the local exchange is mechanical, the trunk line retrieval of the trunk line circuit 8; The ray is turned on and off to generate a dialing pulse.

At this time, when the exchange system completes the reception and transmission of the dialing data, the national exchange transmits the state of the CO line subscriber corresponding to the corresponding telephone number to the switching system. In this case, when the CO line subscriber is in a dormant state, the CO line ringing tone indicates that the CO line is in a call state. ring back tone is received, and a busy tone is received when in a busy state. At this time, the MPU 2 forms a transmission / reception call path between the subscriber circuit 1 and the trunk line circuit 8 through the switching circuit 7, and when the trunk line subscriber hooks off, the MPU 2 switches to the trunk line circuit ( 8), we can see that the CO line loop is formed. Accordingly, it can be seen that voice is exchanged by establishing a transmission and reception call path between the CO line subscriber and the corresponding STN.

After the call is terminated, the transmission and reception call paths formed as above are disconnected and the call service is stopped. The call function of such an exchange system is a known function.

The charging implementation method in the above-described exchange system will be described with reference to FIG.

First, when any station STN connected to the subscriber circuit 1 hooks off, the subscriber circuit 1 detects this and informs the MPU 2 through the line L1. Then, the MPU 2 outputs a control signal through the line L2, which causes the switching circuit 7 to allocate a slot to allocate the reception time of the corresponding subscriber station STN connected to the subscriber station 1 tones. Supply the tone of the generator. In the above state, the subscriber STN is applied to the composite frequency receiving circuit 4 through the subscriber circuit 1 and the switching circuit 7 when dialing, and when dialed, the composite frequency receiving circuit 4 is dialed. Convert the received DTMF signal into digital digit data. The MPU 2 then receives and analyzes the digit data via line L5 in step (A1). At this time, if the digit received in step (A1) is a CO line digit, the MPU 2 searches for the CO line 8 and an empty CO line through the line L9, and if there is an empty CO line, in step (A2) At the same time, the switching circuit 7 is controlled through the line L2 to form a trunk line communication path between the trunk line circuit 8 and the subscriber circuit. Accordingly, by the operation of the MPU 2, the subscriber station STN receives the CO line transmission tone input from the CO line L10 through the CO line circuit 8, the switch circuit 7, and the subscriber circuit 1. .

At this time, when the station subscriber (STN) receiving the CO line dialing dials the telephone number of the CO line subscriber connected to the local exchange, the composite frequency receiving circuit 4 receives the DTMF signal through the subscriber circuit 1 and the switching circuit 7. Convert to digit data. Then, the MPU 2 is received through the complex frequency receiving circuit 4 in step A3 and stores the data in the memory 2 and outputs the data to the complex frequency generator 5 through the line L6. At this time, the complex frequency generating circuit 5 converts this into a DTMF signal and then sends it to the trunk line L10 through the switching circuit 7 and the trunk line circuit 8. Thereafter, the MPU 2 checks whether the telephone number of the CO line subscriber, which is input from the station subscriber (STN) connected to the subscriber circuit 1, is the last digit in step (A4), and the last digit determination is performed for a predetermined time. If not entered, dialing is considered complete.

When the last digit is input as described above, the MPU 2 controls the switching circuit 7 through the line L2 in step (A5) to form a communication path between the trunk line circuit 8 and the subscriber circuit 1, The last digit detection time is read from the time generation circuit 6 and stored in the memory 3 as the call start time.

Then, when a call path is formed and the calling party's station subscriber station (STN) and the called party's trunk line subscriber start a call, the MPU 2 calls the subscriber circuit 1 in step (A6) and the station subscriber station (STN). Check the hook on state. When the subscriber circuit 1 detects the hook-on partner of the station subscriber (STN), the MPU 2 regards the call termination at step (A7) and controls the switching circuit 7 through the line L2 to call. Disconnect the furnace. In step (A8), the STN reads the hooked-up time through the time generation circuit 6, analyzes the telephone number of the CO line subscriber stored in the memory 3, and selects the type of call (cal1). (ISD), long distance long distance (DDD), local calls… ). Thereafter, in step (A10), the MPU 2 reads the last digit detection time stored as the call start time stored in the memory 3 and the hook-on time of the extension subscriber STN stored as the call end time. Calculate (Call time = Call end time-Call start time). After calculating the call time, in step (A11), the call charge according to the type of call in step (A9) and the call time in step (A10) is calculated and returned.

The conventional charging method as described above has the following problems.

Since the first digit is regarded as the call start time, the delay time may be different when the actual dialed digit is passed through several stations and the trunk line is dialed according to the DTMF method or dial pulse method. It was difficult to estimate the exact talk time because the time the signal was sent was different. Because of this, it was difficult to estimate the exact call start time because the time to supply the ring to the called party and the time when the other party hooked off could be fast or slow.

Secondly, when the call completion time is detected, the extension subscriber of the electronic switching system is hooked up by the subscriber circuit and the DTMF, so it is easy to see if the incoming subscriber of the trunk line is hooked up before the extension subscriber of the electronic switching system. Even though the extension subscriber of the electronic switching system does not hook on, or if the receiver is put down incorrectly, the talk time is continuously increased. There was an issue imposed.

Accordingly, an object of the present invention is to provide a method for calculating accurate billing by detecting an accurate call start time and call end time in an exchange system.

Another object of the present invention is to provide a method in which an extension and a CO line can calculate and charge an actual call time by detecting a state of a CO line through a tone detector in an exchange system.

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

FIG. 3 is a block diagram of an electronic switching system for carrying out the present invention, comprising: subscriber circuit 1 for interfacing between the switching system and the telephone while supplying call current to the telephone of an extension subscriber; A microprocessor unit (MPU) 2 that controls call switching and provides various services, and a program and initial service data for executing a call and various functions, including a ROM, a program, The MPU 12 converts the processing data into a data processing area temporarily and converts a memory 3 consisting of RAM and a dual tone multi frequency (DTMF) signal generated from a telephone subscriber into digital data in digital form. A composite frequency receiver (4) for outputting a signal, a complex frequency transmitter (5) for converting and outputting digit data output from the MPU (2) into a DTMF signal, A time generation circuit (clock chip) 6 which generates a time of output and outputs it to the MPU 2, and switches various tone and voice data under the control of the MPU 2 To form a trunk line loop under the control of the switching circuit 7 and the MPU 2 to form a trunk line loop, and exchange signals and data coming from the trunk line. And a trunk circuit 8 for interfacing with the tones, and a tone detection circuit 9 for detecting and outputting a trunk line tone signal received by the trunk line circuit 8 under the control of the MPU 2.

The configuration of FIG. 3 except for the tone detection circuit 9 is the same as that of FIG.

4 is a billing flowchart of an exchange system according to the present invention, which stores the phone numbers of CO line subscribers sequentially received and transmits them to the CO line (B1-B3), and the CO line is transmitted through the tone detection circuit after transmitting the phone numbers. Checking the tone state, the process of storing the trunk line ring tone disconnection time as the call start time (B4-B5), and transitions to the busy state after performing the process (B4-B5), the extension or trunk line in the busy state In the process of checking whether the subscriber transitions to the hook-on state (B6-B7), and when any subscriber transitions to the hook-on state in the process (B6-B7), the hook-on time is stored as the call termination time and stored at the same time. (B8-B9) and a process (B10-B12) of calculating and storing and returning a call rate by analyzing the type of call and the talk time after performing the process (B8-B9).

Based on the configuration described above looks at the charging process of the exchange system according to the present invention.

When the trunk line is formed, the trunk line tone signal according to the state of the trunk line subscriber is output from the local exchange, and the tone detection circuit 9 detects the trunk line tone signal received by the trunk line circuit 8 through the line L12. And to the MPU 2 via the line L11. The MPU 2 may then analyze the CO line tone signal received to recognize the state of the CO line subscriber. At this time, the CO line tone signal includes a CO line tone, a ring back tone, and a busy tone.

First, when the random subscriber STN is hooked off, the subscriber circuit 1 detects the hook-off state of the corresponding subscriber station STN, and the MPU 2 hooks the station subscriber STN through the line L1. Note the off occurrence. The MPU 2 then controls the switching circuit via line L2 to allocate the transmit and receive channels of the subscriber station. At this time, the receiving channel of the station subscriber (STN) is connected to the dial tone port of the tone generator, and the transmitting channel is connected to the composite frequency receiving circuit (4) in the case of an electronic telephone. Accordingly, the subscriber circuit 1 receives the tone of the tone generator outputting the switching circuit 4 through the line L3 and outputs it to the corresponding station subscriber STN. At this time, when the subscriber station (STN) hears the dial tone and performs dialing, the dial signal is applied to the MPU 2 through the subscriber circuit 1, the switching circuit 7, and the complex frequency reception circuit 4. .

Here, the present invention is a billing method for a trunk line call, and the description of the extension call process is omitted, and thus the presently received digit data can be seen as a trunk line call digit. In addition, the procedure of the call process is different as described above, as the type of telephone and local exchange is mechanical or electronic, which assumes that the telephone and local exchange are electronic. Therefore, when the MPU 2 receives the CO call digit in the same process as described above in step (B1), the MPU (2) idles the line L9 to the trunk line circuit 8 in step (B2). If there is an empty trunk line by checking whether there is a trunk, the receiving channel of the corresponding station subscriber (STN) is connected to the trunk trunk by controlling the switching circuit 7 through the line L2 after caesating the empty trunk line. do. Therefore, in step (B2), the subscriber station (STN) receives the trunk line transmission sound supplied from the local exchange through the trunk line circuit 8, the switching circuit 7, and the subscriber circuit (1).

Afterwards, when the STN continuously dials the telephone number of the CO line subscriber to be talked with, the MPU 2 dials through the subscriber circuit 1, the switch circuit 1, and the composite frequency reception circuit 4; The ring digit data is received and sequentially stored in the memory 3 and sent to the complex frequency generating circuit 5 through the line L6. Then, the complex frequency generating circuit 5 converts the dialing digit data into a DTMF signal and outputs it to the switching circuit 7. The DTMF signal at this time is sent to the local exchange side through the trunk line circuit 8. Accordingly, in step (B3), the MPU 2 sequentially receives the telephone number dialed by the station subscriber (STN), stores the stored phone number in the memory 3, and sends the same to the local exchange side.

When the dialing process is finished, i.e., when the MPU 2 stores the telephone number of the trunk line subscriber output from the station subscriber (STN) in the step (B3) in the memory 3 and completes the transmission to the local exchange side. On the other hand, the local exchange side analyzes the received telephone number and supplies a ring signal to the corresponding trunk line subscriber side, and simultaneously transmits a ring back tone to the switching system side. Then, the trunk line circuit 8 receives the trunk line ring tone through the line 10, and the tone detection circuit 9 detects the trunk line ring tone through the line 12 to detect the trunk line ring tone through the line 10. 2).

The MPU 2 then recognizes the CO line ring tone and checks if the CO line subscriber being called hooked off in step (B4). That is, the state is a state in which the station subscriber STN calls the trunk line subscriber and the ring signal is supplied to the trunk line subscriber side, and the trunk line ring tone is supplied to the station subscriber STN side. At this time, when the trunk line subscriber is hooked off, the branch exchange stops the supply of the trunk line ring tone and forms a trunk line loop, which causes the tone detection circuit 9 to cut off the trunk line ring tone at step B4. Recognizing that the trunk line ringing tone has been reached, the current time is read from the time generation circuit 6 in step (B5) and stored in the memory 3 as the call start time. That is, when the station subscriber (STN) calls the trunk line subscriber, the MPU 2 regards the time when the trunk line subscriber is hooked off as the call start time.

When the trunk line subscriber is hooked off as described above, a voice call path is formed between the station subscriber and the trunk line subscriber, and the state of the trunk line call is established.

In the trunk line call state as described above, the MPU 2 checks whether the extension line terminates the trunk line subscriber call in steps (B6) and (B7). At this time, if the station subscriber (STN) hooks on in the busy state, the subscriber circuit (1) detects this and outputs it to the MPU (2) through the line (L1). In addition, when the trunk line subscriber first hooks on during the call, the local exchange breaks the trunk line loop and outputs a busy tone to the switching system. Accordingly, if the MPU 2 hooks on in the busy state, the MPU 2 also considers the call to be terminated when it detects it through the line L1 in step (B6). In addition, when a busy line sound output from the tone detection circuit 9 is detected through the line L11 in a busy state, it is also regarded as a call termination state. However, if the hook-on and CO line busy sound of the extension subscriber is not detected in the above process, it maintains a busy state.

At this time, if the extension hook-on state or the trunk line busy sound is detected in the above step (B6) or (B7), the call line is disconnected through the line L2 at step (B8) and the state of the trunk line is transferred to the idle state. In step (B9), the MPU 2 reads the current time from the time generation circuit 6 and stores it in the memory 3 as the call termination time. Therefore, the MPU 2 regards the time point of the subscriber who is hooked first among the extension subscriber and the trunk line subscriber as the call termination time in the busy state, so that the call time setting for billing calculation can be accurate.

After storing the end time of the call in the memory 3, the MPU 2 performs the billing calculation process. First, in step (B10), the telephone number of the CO line subscriber stored in the memory 3 is read to determine the type of call. Analyze In this case, since the telephone number has a different form according to a call type such as an international call (ISD), a long distance long distance call (DDD), a local call, etc., billing can be performed according to the type of the call. Thereafter, in step (B11), the actual call time is calculated by subtracting the call start time from the memory (3). In this case, the talk time is from the point at which the CO subscriber is hooked off by the extension subscriber, and the subscriber or any of the subscribers is hooked on first in the busy state. It can be seen that the time is calculated. Thereafter, in step (B12), the MPU 2 calculates a call charge according to the type of the call analyzed in the step (B10) and the call time calculated in the step (B11), and stores it in the memory 3 and returns it. .

As described above, after the calling station subscriber dials the telephone number of the called party's trunk line subscriber in the switching system, the time when the call tone is disconnected from the trunk line is regarded as the time of the call, and both the calling party and the called party are hooked off. After the digit transmission time is passed in the state, billing starts at the actual call start time, and during the call state, the caller is on the hook-up state of the called party's call subscriber by the hook-up of the calling party's extension or the busy tone applied to the trunk line. By considering the detected time as the end time, it is possible to set the correct end time by the hook-on side of the CO line even if the extension subscriber puts down or handles the receiver incorrectly, thereby improving the accuracy and reliability of the billing. At the same time, the CO line is made more efficient by making the CO line idle. There is an advantage that can be used.

Claims (2)

In the charging method of a private switching system having a tone detection circuit for detecting a trunk line tone state, a step of storing a telephone number of a trunk line subscriber which is sequentially received and transmitting it to the trunk line side (B1-B3), and transmitting the telephone number. After checking the CO line tone state through the tone detection circuit, and storing the CO line disconnection time as the start time (B4-B5), and transitions to the busy state after performing the process (B4-B5), Checking whether the extension or trunk line subscriber transitions to the hook-on state in a busy state (B6-B7), and terminates the hook-on time when any subscriber transitions to the hook-on state in the process (B6-B7). It saves the time and simultaneously disconnects the call (B8-B9), and after performing the process (B8-B9) to analyze the type and call time of the call to calculate and store and return the call charges (B10-B12) A billing method for a private exchange system characterized by a glitch. The method (B6) according to claim 1, wherein the hook-on occurrence checking process (B6-B7) is regarded as a call termination of the extension subscriber upon receiving a hook-on signal through the subscriber circuit in the busy state (B6), and in the step (B6). The charge of the private switching system, characterized in that the call termination of the CO line subscriber is regarded as being terminated when the CO line tone is received through the tone detection circuit when the station is not hooked on, and the process returns to (B6) above. Way.

Images