KR0133001B1 - The keyphone charging method using polarity inversion signal - Google Patents

Abstract

The present invention relates to a method for charging a telephone in a key phone system using a polarity reversal signal. In the conventional charging method, a call start time is determined by a predetermined charge time, regardless of the actual call start time of a public telephone network. The present invention provides the fact that there is a difficulty in calculating accurate talk time and charges, and there is a possibility of dispute with the user about inaccurate call history. Accurate real call time by detecting the polarity reversal signal on the line according to the connection and short circuit of the public telephone network at the trunk line end of the key phone system and using it as the start and end point of the call to calculate the accurate call rate by measuring the accurate call time Charges and call charges allow the user to To get rid of the doubt, and that the exact duration and call charges are easily managed operator side as well increases the reliability of the phone system.

Description

How to charge phone bill in keyphone system using polarity reversal signal

1 is a block diagram of a key phone system for the present invention.

2 is an operation flowchart for determining whether to detect a polarity reversal signal at the trunk line end of the key phone system.

3 is a preliminary flowchart of operation in which charges are made by calling external subscribers.

* Explanation of symbols for main parts of the drawings

1 main device 2 telephone

3: output section 11: main section

11A: Rombu 11B: Rambu

12: trunk line part 12A: detection part

13: subscriber

The present invention relates to a method for charging a telephone bill of a key phone system, and in particular, a polarity reversal signal detected at a trunk line end at the start and end of a trunk line call of a subscriber of a key phone system connected to a public telephone network system capable of generating an inversion sognal. In the key phone system using the polarity reversal signal used to determine the start and end times of the call, and to know the exact call history (call start / end time, call time, trunk line / subscriber number, dialed number, call rate, etc.). Of the telephone billing method.

In the conventional telephone billing method, consider the technique known in Korean Patent Application No. 89-17680, "Method of displaying telephone bills in a keyphone system". The call start time is determined by a predetermined charge time regardless of the actual call start time, which causes difficulty in calculating the correct call time and charges, and may cause disputes with the user about incorrect call history. do.

In view of the above, the present invention detects the polarity reversal signal on the line at the trunk line side of the key phone system according to the connection and short-circuit of the public telephone network connected to the public telephone switching system connected to the key phone system, and starts the call. By using it, it is characterized in that the accurate call rate is calculated by measuring the correct talk time.

That is, the present invention comprises the steps of determining whether to detect the polarity inversion signal at the trunk line side of the key-phone system, determining the call start time by detecting the primary polarity inversion signal, and starting the charging process; and Determining the end time of the call by the detection of the second polarity inversion signal during the execution of the end of the billing and printing the call history.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a key phone system according to the present invention, which includes a main unit 11 for controlling call processing and overall functions of the system, and a trunk line unit for detecting a line state at the trunk line side and controlling a trunk line at which a line is sent ( 12) and a main unit (1) composed of a subscriber unit (13) for inspecting and controlling the state of the connected internal subscriber telephone and interfacing therewith; A key phone telephone or a general telephone (2) having a display function connected by the subscriber unit (13) by two or four lines; It is composed of an output unit 2 which is connected to the main device 1 and which is a serial / parallel printer or a personal computer for outputting corresponding data.

Charge-related programs and data are stored in the ROM 11A and RAM 11B constituting the main unit 11, and the polarity inversion signal of the trunk line for the present invention is detected on the trunk line unit 12 by the main. The detection part 12A sent to the part 11 is imposed.

A method of inputting data according to the rate system in the telephone 2 of the key phone system having the above configuration, a method of determining a call rate system in the main unit 11, and a method of transmitting call history to the output unit 3; Since the detection circuit of the polarity inversion signal on the trunk line 12 is well known, a detailed description thereof will not be provided.

Call processing procedure of the public telephone network switching system in accordance with the present invention is as follows.

In FIG. 1, when the telephone 2 picks up the handset and occupies the line of the trunk line part 12, the upper switching system prepares to receive a dial and transmits a dial tone to the telephone 2. At this time, the telephone 2 dials the external number to be called, and the upper exchange system calls the corresponding called party with the external number. When the called party responds, the upper switching system reverses the polarity of the line, and the detection unit 12A of the trunk line unit 12 detects this and informs the main unit 11 that there is a response by the called party. When the called party terminates the call after the call, the upper switching system reverses the polarity of the line, and the detection unit 12A of the trunk line unit 12 detects this and informs the main unit 11 that the call is terminated.

The above operation will be described with reference to the operation flowcharts of FIGS. 2 and 3.

2 is an operation flowchart for determining whether to detect the polarity inversion signal by the detection unit 12A of the trunk line unit 12. As shown in FIG.

A first step (S1) of selectively determining whether to detect the individual lines of the trunk line unit 12; For the line for which the polarity reversal signal is to be detected according to the step S1, the corresponding flag in the inversion table (inversion table: 1 bit per trunk line) is set (# 1), and the line for which the polarity reversal signal is not to be detected. A second step S2 of clearing the corresponding flag of the inversion table; If it is determined that the corresponding trunk line is the end, otherwise, the steps S1 and S2 are repeated, and if the final trunk line is completed, the process proceeds to the third step S3.

According to the control method of FIG. 2, charge can be charged for each trunk line by using the polarity inversion signal. Also, for the trunk line where no polarity inversion signal exists, the charge is made using the existing charge rate. You can use a reverse table to make the charges as appropriate.

3 is a flowchart illustrating the overall operation in which the phone 2 calls an external subscriber through the trunk line unit 12 and charges are made.

First, a first step (T1) of determining the fare system of the call according to the input telephone number and the call start date and time; A second step (T2) of checking the inversion table for the corresponding line; If the corresponding bit in the inversion table is cleared (flag '0') in the step T2, it is checked whether the input charge time is reached and the charge is displayed according to the input charge time interval and charge system. A third step (T3) displayed on the screen and checking whether the corresponding call has ended; If the corresponding bit of the inversion table is set (flag # 1) in step T2, the detection part 12A of the trunk line part 12 detects the primary polarity inversion signal and the detection is confirmed (when the called party responds). The trunk line unit 12 transmits a corresponding message to the main unit 11 and displays a charge on the display unit of the telephone 2 according to the input charge time interval and the charge system (T4); A fifth step T5 of checking whether or not the second polarity inversion signal is detected (end of call); When the call is terminated in the third step (T3) and the fifth step (T5) and proceeds to the sixth step (T6) for outputting the call history data to the output unit (3) connected to the main device (1).

The first step (T1) and the third step (T3) of the above steps are well-known and will not be described in detail.

According to the control method of FIG. 3, in the fourth step T4, the time when the first polarity inversion signal is detected is the start point of the call so that a timer indicating the talk time is operated. Then, the call start time is recorded in the RAM section 11B of the main section 11.

In addition, charge calculation and display proceed during the call. If there is an end of the call, the second polarity reversal signal is detected by the detection unit 11A of the trunk line unit 11 and the call time is defined as the end point of the call. The timer displaying the time is stopped and the call end time is recorded in the RAM section 11B of the main section 11. Then, the details related to the call (call start / end time, total call time, subscriber number, calling external dial number, trunk line number, charge value, etc.) is output to the output unit (3).

As described above, according to the present invention, as the start and end time of the call is determined by the detection of the polarity inversion signal, the corresponding user eliminates suspicion about the call charge by imposing an accurate actual call time and call charge. The operator can easily manage accurate talk time and call charges, thus increasing the reliability of the key phone system.

Claims (1)

In the charging method in a key phone system comprising a main device (1) comprising a main part (11), a trunk line part (12), and a subscriber part (13), a general telephone (2), and an output part (3), The trunk line unit 12 includes a detection unit 12A which detects the polarity inversion signal and sends the polarity inversion signal to the main unit 11, and selectively selects the polarity inversion signal for the individual lines of the trunk line unit 12 of the key phone system. For the line for which the polarity reversal signal is to be detected by determining whether or not to detect the polarity reversal signal, set the flag corresponding to the inverted display (표시 1 ＂) and clear the corresponding flag in the inversion table for the line for which the polarity inversion signal is not to be detected (＂ 0). Iii) select a charging method, and then charge the call using the charging time specified for each trunk line by the charging method selected above, or indicate when the first polarity reversal signal is detected. If the second polarity inversion signal is detected as the end of the call, the start time and the end time of the call are stored in the RAM section 11B of the main section 11, Calculate the talk time and charge according to the difference of the time when the polarity inversion signal is detected, store it in the RAM section 11B of the main section 11, and detect the polarity inversion signal that outputs the details related to the call to determine the call charge. Method for charging a telephone in a key phone system using a polarity reversal signal, characterized in that the charging process.