KR100236515B1 - Method for last call recall in an electronic switching system - Google Patents

Abstract

The present invention relates to a final call recall method in an electronic switchgear that calls again a calling subscriber who finally called a subscriber whose last call recal supplementary service function has been registered in the electronic switchboard. Conventionally, even if the subscriber needs to urgently call the counterpart who previously called himself again, it is impossible to call when the subscriber does not know the number of the counterpart. Therefore, in the present invention, the electronic switchboard 110 may call the other subscriber who finally called itself by providing a final call recall service to a specific subscriber, and determine the number of the calling subscriber after the incoming call. Therefore, there is an effect that it is easy to track the other subscriber who has recently called himself.

Description

How to recall the last call in the electronic exchange

The present invention relates to a method for recalling a final call call in an electronic switchboard, and in particular, calls back to a calling subscriber who finally called a subscriber whose last call recall additional service function is registered in an electronic switchboard. It relates to a final call recall method in the electronic switch.

Conventionally, even if the subscriber needs to urgently call the counterpart who previously called himself again, it is impossible to call when the subscriber does not know the number of the counterpart. In addition, it is not possible to find out the number of the previous calling subscriber who does not register the calling tracking function separately.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and by providing a final call recall service to a particular subscriber in an electronic switchgear, it is possible to recall the other party who finally called itself, The goal is to provide a way to find out the calling party's number.

According to another aspect of the present invention, there is provided a method of recalling a final call in an electronic switch, comprising: a first step of storing a number of a call last received by a subscriber registered in a final call recall service; And a second step of recalling the number of the last incoming call.

1 is a block diagram of an internal exchange switch capable of accommodating a final call recall method in an electronic switch according to the present invention.

2 is a diagram illustrating an example of a structure of a database managed by a call processing controller for a final call recall process.

3 (a) and 3 (b) are a flow chart showing step by step an embodiment of the method of the final call recall in the electronic switch according to FIG.

* Explanation of symbols for main parts of the drawings

100: call processing control unit 102: subscriber matching unit

104: relay line matching unit 106: switch connection unit

108: operator matching unit 110: electronic switchboard

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

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

FIG. 1 is a block diagram of an internal switch that can accommodate a final call recall method in an electronic switch 110 according to the present invention. The call processing control unit 100, the subscriber matching unit 102, and the relay line matching unit ( 104, switch connection 106, and operator mating 108.

In the figure, the call processing control unit 100 in the electronic switchboard 110 is connected to the subscriber between the subscriber matching unit 102, the relay line matching unit 104, the switch connecting unit 106, and the operator matching unit 108. It is responsible for overall control over call origination, incoming call processing and supplementary service processing.

The subscriber matching unit 102 matches the subscriber line in the electronic switchboard 110 and reports / manages the status of the subscriber to the call processing control unit 100.

The relay line matching unit 104 reports the state of the relay line to the call processing control unit 100 by matching with another public switched telephone network (PSTN) and another integrated service digital network (ISDN). Manage.

The switch connection unit 106 controls connection / disconnection of the speech path of the originating and receiving subscribers by request / instruction of the call processing control unit 100.

The operator matching unit 108 receives data for operating the system from the call processing control unit 100 and manages data management, maintenance, billing, and statistical functions.

2 is a diagram illustrating an example of a structure of a database managed by the call processing control unit 100 for a final call recall process, in which a first byte indicates a final call recall service flag. Use as a signal. In addition, the remaining 16 bytes can be used as a buffer to store the number of the last call subscriber, each of which can store up to 16 numbers.

3 (a) and 3 (b) is a flow chart showing step by step an embodiment of the method of the last call recall in the electronic switch 110 according to FIG.

First, the call processing control unit 100 receives a notification from the relay line matching unit 104 that a call has been received by a subscriber registered with the last call recall service function (step 300).

It is checked whether the subscriber registered with the above-mentioned last call recall service function is in a callable state (step 302).

It is determined whether or not to register the last call recall service function for the called party (step 304).

Last Call Recall Registration If the subscriber is a subscriber, the calling party's number is stored in the last call directory number buffer in order from zero and the last call recall flag is registered as TRUE (step 306).

An incoming request is made to the subscriber matching unit 102 of the incoming transit switch 110 to which the last call recall service subscriber belongs (step 308).

Wait in the incoming call waiting state (step 310).

As the subscriber matching unit 102 finds and calls the called party in another country or home country, the calling exchange receives a notification that the called party answered (step 312).

An incoming call response notification message is sent to the originating exchange via the local exchange or relay line matching unit 104 (step 314).

Wait in the last call recall service subscriber busy state (step 316).

A notification is received that the called or originating subscriber has recovered the call (step 318).

The calling or terminating exchange is notified that the call is released (step 320).

As shown in FIG. 3 (b), the state of the last call recall service subscriber is made in the dormant state and the next call processing is waited (step 322).

The subscriber matching unit 102 receives an outgoing request message from the last called party to the last calling party.

The digit information pressed by the last caller service subscriber is stored and analyzed (step 326).

It is determined whether or not the last caller service subscriber requested the output of the last calling party number (step 328).

If it is required to output the last calling party number, the operator matching unit 102 outputs the last calling party number stored in the last call recall service buffer on the operator's Cathode Ray Tube (CRT). (Step 330).

If it is not the last calling party number output, it is determined whether it is the last call recall service request (step 332).

If it is not the last call recall service request, normal outgoing processing is terminated (step 334).

As a result of the determination in step 332, the flag signal registered in step 306 is read, and in the case of the final call recall service request, it is determined whether or not the last call recall service is registered (step 336).

If the last call recall service is not registered, the current call is failed (step 338).

If the last call recall service function is registered, the number of the last call subscriber number stored in the last call recall service buffer is translated to perform routing for call origination (step 340).

A call notification is made to the destination exchange side determined by routing (step 342).

Waiting for the called subscriber to respond in the waiting state for response as in the normal call signal processing (step 344).

In addition, the final call-call recall service function is registered and canceled by the operator organizing an operator terminal connected to the electronic switchgear 110 by a man machine communication (MMC) function of the electronic switchgear 110. For example, after storing the calling party's number by using the calling party tracking function in the electronic switchboard 110, when the last calling call recall service registered subscriber presses “* 51”, the caller calls “* 52”. Press to recognize and process the caller number output on the operator's cathode ray tube.

As described above, the present invention provides a final call recall service to a specific subscriber in the electronic switchboard 110, so that the subscriber can finally recall the called party, and the incoming subscriber's number is called after the incoming call. Find out. Therefore, there is an effect that it is easy to track the other subscriber who has recently called himself. In addition, the principles of the present invention have been described above with reference to specific devices, which are described by way of example only, and are not limited to the technical spirit of the present invention as described in the claims.

Claims (3)

CLAIMS What is claimed is: 1. A method for recalling a final call at a switchboard, the method comprising: a first step of storing a number of a call last received to a specific subscriber registered in a final call recall service; And a second step of re-calling the number of the last incoming call. 2. The method of claim 1, wherein the first step comprises: a twenty-first step of receiving notification that a call has been received by the specific subscriber registered in the last call recall service; A twenty-second step of checking whether the specific subscriber is available; A twenty-third step of determining whether to register a final call recall service function for the subscriber; A twenty-fourth step of storing each calling party's number in turn and registering the last call recall flag and requesting an incoming call; Waiting for an incoming call to receive notification that the called party has answered; And a twenty-sixth step, by sending an incoming call response notification message to the originating exchange, receiving a notification that the calling subscriber has recovered the call path, making the state of the last call recall service subscriber idle, and waiting for the next call processing. The final call recall method in the electronic switchgear. 2. The method of claim 1, wherein the second step comprises: receiving a call request message from the specific subscriber to the last calling subscriber; A thirty-second step of storing and analyzing digit information pressed by the specific subscriber to determine whether to request the output of the last calling party number; Displaying the number of the last calling party when displaying the last calling party number; Determining, in the case of not requesting the output of the last calling party number, whether or not it is a last call recall service request; Step 35, if it is not a final call recall service request, normal call processing; Determining, in the case of the last call recall service request, whether to register the last call recall service; Step 37, if the last call recall service is not registered, failing on the current call signal; Performing a routing for call origination of the last calling party's number when the last calling party call service function is registered; And a thirty-seventh step of making outgoing call notification to the destination exchange side determined by the routing.