KR930004034B1 - Redialing method in pabx - Google Patents

Abstract

The method improves the efficiency of station communication by switching the station communication when calling the busy station subscriber. The station communication channel is formed when the called station is not in busy state after analyzing the dialing signal generated from the calling station. When the called station is busy, a check is made on whether the redialing signal is received or not within a fixed time. In absence of redialing signal, the busy tone is released and the hook on state is serviced. When the redialing signal is received, the called station number changes, followed by returning to the first step.

Description

Extension redial method of private exchange system

1 is a block diagram of a private exchange system.

2 is a conventional flow chart.

3 is a flow chart of the present invention.

* Explanation of symbols for main parts of the drawings

10: CPU 20: memory part

30: interface unit 40: subscriber circuit

50: switching circuit 60: tone supply circuit

70: DTMF Receive Circuit 80: DTMF Receive Circuit

90: trunk line circuit 100: dedicated line circuit

110: ring generating circuit

The present invention relates to an extension dialing method of a private switching system, and more particularly, to a method of allowing a calling extension to redial to an adjacent extension of a calling extension by changing the last extension number when the calling extension is busy.

1 is a block diagram of a general private exchange system, which includes a CPU 10 that performs exchange functions and overall control operations of a private exchange system, and an overall operation control program of the private exchange system. A memory unit 20 for temporarily storing data to be stored, an interface unit 30 for buffering and interfacing input / output data between the CPU 10 and each component of the switching system, and simultaneously supplying call power to an internal station. A subscriber circuit 40 for interfacing the station and the switching system under the control of 10, and a switching circuit 50 for time division multiplexing signals and voice data under the control of the CPU 10 to form a call path; A ton supply circuit which generates various tone signals (dial tone, busy tone ring back tone, etc.) under the control of the CPU 10 and outputs them to the switching circuit 50. (60), a DTMF receiving circuit (Dual Tone Multi-Frequency Receiver) 70 for converting the DTMF signal of the extension generated through the subscriber circuit 40 into a digital signal and outputting the digital signal to the CPU 10; Under the control of the CPU 10, a DTMF sender 80 which converts CO line digit data into a DTMF signal and outputs the DTMF signal to the switching circuit 50, and a CO line which is idle under the control of the CPU 10. Seizure to form a trunk line loop, the trunk line circuit 90 for interfacing between the trunk line and the switching system, and a tie line under the control of the CPU 10 to send a predetermined input signal and to receive A dedicated line circuit (100) for transmitting a acknowledge signal (signal acknowledgment) by an incoming signal and interfacing a dedicated line between other private switching systems, and a ring generating circuit for supplying a ring signal to the subscriber circuit (40). It consists of 110.

It looks at the process of the extension call in the private exchange system as described above.

It is assumed here that the nth extension STn dials the first extension ST1. First, when the n th extension STn is hooked off, the CPU 10 recognizes the hook off state of the n th extension STn through the subscriber circuit 40 and controls the switching circuit 50. A channel of the first n station STn is formed. Then, when the subscriber of the nth extension STn dials the extension protection of the first extension ST1, it is applied to the DTMF receiving circuit 70 through the subscriber circuit 40 and the switch circuit 50, and receives the DTMF. The circuit 70 converts the DTMF signal generated by dialing into digital data and applies it to the CPU 10.

At this time, when the CPU 10 receives the dialing signal for the last extension number in step 201, the CPU 10 analyzes the extension number dialed by the nth extension STn. In this case, since the called extension is assumed to be the first extension ST1, the CPU 10 analyzes whether the called extension (the first extension) is in a busy state (step 202). At this time, if the first station ST1, which is the called station, is idle, the CPU 10 controls the switching circuit 50 in step 203 to control the nth station STn and the first station ST1. By forming a currency path of the extension call will be performed.

However, when it is determined in step 202 that the first extension ST1 is in a busy state, in step 204, the switching circuit 50 is controlled to set the busy tone of the tone supply circuit 60 to n. Connect by extension STn. Thereafter, steps 205 and 206 are performed to perform a hook-on service of the n-th station STn, which is the calling station, and the CPU 10 controls the subscriber circuit 40 to disconnect the n-th station STn. Release it and prepare for the next state.

Therefore, in the conventional extension dialing method as described above, if the extension of the called party is in the passing state, the calling extension should be hooked off again after performing the hook-on, and the dialed extension should be redialized. There was a problem that the call execution time is long.

Accordingly, an object of the present invention is to provide a method for redializing an extension adjacent to a called extension in a state in which the called extension is passing when an extension call is attempted in a private exchange system.

It is still another object of the present invention to provide a method for making an extension call to an adjacent extension by dialing only the last extension number of an extension which is adjacent to the called extension when the extension is in a call. .

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

The configuration of the private exchange system for carrying out the present invention is the same as that in FIG. 1, and the reference numerals for each component are the same.

3 is a flowchart according to the present invention, which analyzes a dialing signal generated from a calling extension to check whether a called extension is in a busy state and forms an extension call path at a pause state, and the first step. In the process, the second station checks whether a redial signal is received within a predetermined time while the called station supplies the busy tone to the calling station when the call is busy, and releases the busy tone when there is no redial signal in the second process. The third step of the hook-on service and the fourth step of releasing the busy tone upon receiving the redial signal in the second step, changing the previously received called extension number and returning to the first step.

Based on the above-described configuration, the present invention will be described in detail with reference to FIGS. 1 and 3.

As described above, when a dial signal is generated from the extension, the extension dial signal is sequentially applied to the CPU 10 through the subscriber circuit 40, the switching circuit 50, and the DTMF receiving circuit 70. At this time, the CPU 10 analyzes the dialing data received from the extension and services the corresponding function. Herein, it is assumed that an extension call is made by calling the first extension ST1 of the nth extension STn, and it is assumed that the second extension ST2 is an adjacent extension of the first extension ST1.

Therefore, when the nth extension STn dials the last number of the first extension ST1, the CPU 10 recognizes that the last dialing data has been received in step 301, and the last dial in step 302. Check if the called station according to the ring data is in transit. Here, it can be seen that the called extension becomes the first extension ST1. At this time, when the first extension ST1, which is the called extension in step 302, is determined to be in a busy state, the CPU 10 controls the switching circuit 50 in step 303 to control the tone supply circuit 60. The busy tone of is supplied to the nth extension STn. Thereafter, the CPU 10 analyzes the state of the nth extension STn port of the subscriber circuit 40 in step 304 to check whether the nth extension STn, which is the caller, is hooked on, and the nth extension STn. If the hook-on state is determined, the switching circuit 50 is controlled in step 305 so that the nth station STn disconnects the connection state and prepares for the next state.

However, if the first n station STn is found to be in the hooked-off state in step 304, it is checked in step 306 whether a redial signal is generated from the n-th station STn as the caller. At this time, when the subscriber of the nth extension STn hears a busy tone indicating that the first extension ST1, which is the calling extension, is in a busy state, the subscriber of the nth extension STn dials the last extension number of the second extension ST2 that is the adjacent extension. . That is, the number between extension groups typically has a difference of about 1 or 2 digits, so in the present invention, only the numbers of the call extension and the adjacent extension are dialed in order to switch to the adjacent extension when the calling extension is busy. do. Therefore, when dialing to the adjacent extension which is the nth extension which is the call extension in step 306, the CPU 10 receives this and changes the call extension number of the subscriber table stored in the specific area of the memory unit 20, ( In step 307, the switching circuit 50 is controlled to disconnect the busy tone of the tone supply circuit 60 supplied to the n-th station STn, and then the process returns to the step 302. After that, the CPU 10 checks whether the call extension changed in step 302 is in the busy state, and if it is in the idle state, controls the switching circuit 50 in step 312 to control the nth extension. An extension call is performed by connecting the STn and the call path of the second extension ST2.

That is, assuming that the extension number of the first extension ST1 is "2001" and the extension number of the second extension ST2 is "2002", the nth extension STn dials "2001" and the first extension. If it is determined that the call is in a busy state by calling (ST1), the n-th extension STn receives "2", which is the last extension number of the second extension ST2, in the state of receiving the busy tone, and thus, of the memory unit 20. After changing the calling extension number of the nth extension subscriber table area in the subscriber table to "2002", the busy tone is released and the extension call is switched.

However, if the redial signal is not generated from the nth station STn in step 306, a predetermined time (approximately 5 seconds) is supplied after the busy tone is supplied to the nth station ST1 that is the calling station in step 308. Degree) is passed, and if the predetermined time has not been exceeded, the process returns to step 304 above. However, when a predetermined time is exceeded after the busy tone is supplied in step 308, the CPU 10 controls the switching circuit 50 in step 309 to supply the busy supply of the tone supply circuit 60 to the nth station STn. The tone is disconnected, and step 310 is performed to cut the communication path at the time of the nth extension (STn) hook off and prepare for the next state.

As described above, when an extension subscriber calls another extension subscriber in a private exchange system, an extension call is made by calling only the last extension number of another extension subscriber in the calling extension group while busy. There is an advantage that can improve the efficiency of an extension call by being able to call.

Claims (1)

A method for re-dialing an extension of a private exchange system, comprising: a first process of analyzing a dialing signal generated from a calling extension to check whether a called extension is in a busy state, and forming an extension call path in a pause state; A second step of checking whether a redial signal is received within a predetermined time while supplying a busy tone to the calling station when the called station is passing in step 1; and canceling the busy tone when there is no redial signal in the second step. And a fourth process of hook-on service and a fourth process of releasing a busy tone upon receiving a redial signal in the second process, changing a previously received called extension number, and returning to the first process. The wire rod dial method of a private exchange system.