KR20000040168A - Apparatus and method for automatic redial in exchange system - Google Patents

Abstract

PURPOSE: An apparatus for an automatic redial in an exchange system and a method for the same are provided to increase possibility of a telephone call to the other person, by automatically dialing other phone numbers related to the other person in sequential when a member of a public line is absent or the public line of the member is busy. CONSTITUTION: If a telephone bell rings(S1), a controller(111) of an exchange(11) detects a busy tone and ring-back tone(S2) and then call the same phone number again after a predetermined time(S3). If the ring-t a member responds to the call(S4). If other person or an answering machine respond to the call, it is determined that an automatic redial be requested(S5,S6). If the redial has been requested, the controller(111) terminates the current call, searches a memory(115) to find the related phone numbers and then calls the phone numbers to generates a call sound at a telephone set of a public line(S7). Returning to S3, the controller(111) forms a communication path to make a phone call(S8).

Description

Automatic redial device and method in the exchange system

The present invention relates to an automatic redial in a simple switching system, and more particularly, to an automatic redial apparatus in an exchange system that enables a call with a counterpart by automatically redialing a number associated with a counterpart when a calling party is absent or busy. It is about a method.

In general, when the extension subscriber of the simple switching system picks up the handset to talk with the desired party, the simple switching system connects the corresponding subscriber to the trunk line and outputs a dial tone from the local exchange to the subscriber, thereby making the extension subscriber dial. If the call is made between the extension subscribers, the extension subscriber can press the extension number to be called to send a ring tone to the corresponding extension subscriber.

When a station subscriber is out of service through a conventional simple switching system configured as described above, the corresponding subscriber is redialed when the corresponding subscriber is not present or is busy. By pressing the button, the automatic redial function can be executed. If the predetermined time is exceeded after the automatic redialing, the redial is attempted with the same number, even after the automatic redial attempt is made a predetermined number of times. If you cannot speak to the other party, the automatic redial feature is cancelled.

Here, the automatic redial function of the simple private exchange should dial multiple digit redial function numbers, and the general telephone uses the redial button using the redial button used when directly connected to the general trunk line when using the private exchange. You must not dial the redial number.

At this time, the exchange side wastes using resources continuously for receiving DTMF (Dual Tone Multi Frequcey) tones from the extension.

Similarly, a redial number must be entered on a keypad phone, and in addition, it must be entered on a programmable floating button for more convenient use.

As such, in the conventional simple switching system, the automatic redial function requires that the subscriber memorizes with a predetermined redial code when he or she is absent or busy when calling to a CO line subscriber, and the numbers must be dialed to redial the same telephone. Since redial is attempted using a number, the possibility of a call connection with the other party is rare, and the method of redialing the complex has a problem.

The present invention has been made in view of the above-described problems, and the present invention calls the subscriber to the CO line subscriber in a simple exchange system, and automatically redials another phone number associated with the other party in response to the corresponding CO line subscriber being absent or busy. By doing so, it is possible to increase the possibility of a call with the counterpart and provide convenience to the user.

1 is a block diagram of an automatic redialing apparatus in an exchange system according to an embodiment of the present invention;

2 is a flowchart showing an automatic redialing operation in the exchange system according to the first embodiment of the present invention.

3 is a flow chart showing an automatic redialing operation in the exchange system according to the second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: Local exchange 11: Simple exchange

12: extension telephone 13: trunk telephone

110: trunk line interface 111: control unit

112: station interface 113: CO line tone detection unit

114: time control section 115: memory section

116: digital audio unit

In order to achieve the above object, the present invention, the trunk line interface 110 for matching the incoming and outgoing signals through the trunk line connected to the local exchange, the extension interface 112 for matching the input and output signals to the extension telephone, In a simple exchange having a trunk line tone detection unit (113) for detecting a tone signal from a local exchange and a digital voice unit (116) for connecting recorded voice data between an extension and a trunk line, the trunk line occupied recently by the other party. A memory unit 115 for storing the extension number and the number data associated with the other party or storing a redial time setting value; A time controller 114 for reading a redial time setting value from the memory unit 115 and driving a timer; And a control unit 111 which operates according to an operation program stored in the memory unit 115 and controls the operation of each circuit unit.

On the other hand, when a call to the CO line is generated, transmitting a ring tone to the corresponding CO line; Requesting automatic redialing if there is no response even if the ring tone is transmitted a predetermined number of times; And retrieving and calling the number data associated with the counterpart according to the automatic redial request.

On the other hand, the process of requesting the automatic redial, if there is no response for a predetermined time and off-hook state, operating a timer according to a predetermined redial timer value; And performing the automatic redial after the predetermined redial timer value has elapsed.

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

In the simplified switch system having an automatic redial function according to an embodiment of the present invention, as shown in FIG. 2, the trunk line interface unit 110, the control unit 111, the station interface unit 112, The trunk line tone detection unit 113, the time control unit 114, the memory unit 115, and the digital voice unit 116 are provided.

In the simple switchboard, the trunk line interface 110 matches the incoming and outgoing signals through the trunk line connected to the local exchange.

The extension interface unit 112 matches signals inputted and outputted to the extension telephone.

The memory unit 115 stores the recently occupied trunk line, the extension number and the number data associated with the other party, or stores a redial time setting value.

The control unit 111 is operated according to an operation program stored in the memory unit 115 to control the operation of each circuit unit.

The trunk line tone detection unit 113 detects the tone signal from the local exchange and applies it to the control unit 111.

The time controller 114 reads the redial time setting value from the memory 115 to drive a timer.

The digital voice unit 116 connects voice data recorded according to a control command of the control unit 111 between an extension line and a trunk line.

The operation of the simple switch according to the first embodiment of the present invention configured as described above will be described in detail with reference to FIG. 3.

First, assuming that an automatic redial key or a code corresponding thereto is input to the simple switch system 11, and that relevant telephone numbers for automatic redial are registered as a group, the extension subscriber 11 can switch to the simple switch 11. When dialing in order to call a trunk line telephone housed in the TBA 10 through, the trunk line ring applied through the TBA 10 is received by the simple switch 11, and the control unit 111 makes a call to an extension subscriber. When the extension subscriber dials the CO line number through the extension telephone, the control unit 111 detects the corresponding dial tone through the CO line tone detection unit 113 to the corresponding CO line 13 through the CO line interface 110. The ringing tone is transmitted, and the telephone line rings at the trunk line telephone 13 as the ringing tone is transmitted (step S1).

Accordingly, the control unit 111 of the simple exchange 11 detects whether the ring back tone or the busy tone is through the trunk line tone detection unit 113 (step S2). After the predetermined time has elapsed, the same telephone number is called again (step S3), and in the case of ringback tone, it is checked whether the user of the trunk line telephone picks up the handset, that is, the user of the trunk line telephone answers after the predetermined time (step S4) ).

Here, when the third party responds when the other party answers, that is, when the answering machine receives or another person receives, the extension subscriber decides whether to request an automatic redial (steps S5 and S6).

At this time, when the extension subscriber makes an automatic redial request, the control unit 111 automatically terminates the current call, searches for a related telephone number registered from the memory unit 115, and then dials another number related to the other party. The call sound is sent to the trunk line telephone 13 side via the unit 110 (step S7).

When the user of the trunk line telephone responds to the step S3, a call path is established between the outsider and the extension telephone by the control of the control unit 111 to make a call with the outsider (step 8).

On the other hand, if the other party does not answer in step S3, if the automatic redial is operated automatically after a predetermined time or while listening to the ringback tone, the call returns to step S5 to register the related telephone call according to the automatic redial request. The number is retrieved and called automatically.

On the other hand, the operation of the simple switch according to the second embodiment of the present invention will be described in detail with reference to FIG.

First, when an extension subscriber dials in order to call a trunk line telephone housed in the local exchange 10 through the simple exchange 11, the trunk line ring applied through the local exchange 10 is received by the simple exchange 11 and the controller ( When the 111 establishes a call to the extension subscriber and the extension subscriber dials the CO line number through the extension telephone, the control unit 111 detects the corresponding dial tone through the CO line tone detection unit 113 to detect the CO line interface 110. The call tone is sent to the corresponding trunk line via the telephone line, and as the call tone is transmitted, the telephone line ringing sounds at the trunk line telephone 13 (step S11).

Accordingly, when the control unit 111 of the simple switch 11 is in the off-hook state for a predetermined time, the redial predetermined timer value is read from the memory unit 115, and the time control unit 111 is driven to operate the timer. (Steps S12, S13, S14).

Here, when the extension subscriber does not press another button until the timer expires, the automatic redial function is performed. The control unit 111 knows that the timer expires from the time control unit 114 (step S16), and the memory unit 115. Then, the associated telephone number is searched for, and the other number is transmitted to the corresponding trunk line telephone 13 through the trunk line interface 110 (steps S17 and S18).

Accordingly, when the user of the trunk line telephone 13 responds, a call path is established between the outsider and the extension telephone by the control of the control unit 111 to make a call with the outsider (steps S19 and S20).

On the other hand, if the station subscriber presses another button before the timer expires in step S15, the timer ends immediately and the auto redial function stops (step S21), and the flow returns to step S19.

In the above operation description, a case where a call is received from a trunk line has been described as an example. However, the present invention is not limited thereto, and automatic redialing is performed in the same manner as described above for calls generated between extension telephones.

As described above, the present invention increases the likelihood of making a call with the counterpart by automatically redialing another telephone number associated with the counterpart by calling the co-subscriber in the simple switchboard system, when the corresponding CO line subscriber is absent or busy. To provide convenience.

Claims (3)

CO line interface 110 for matching signals input and output via trunk lines connected to the local exchange, station interface 112 for matching signals input and output to the extension telephone, and CO line tone detection for detecting tone signals from the local exchange. In the simple exchanger comprising a unit 113 and a digital voice unit 116 for connecting the recorded voice data between the station and the trunk line, A memory unit 115 for storing the recently occupied trunk line, the extension number and the number data related to the other party, or storing a redial time setting value; A time controller 114 for reading a redial time setting value from the memory unit 115 and driving a timer; And a control unit (111) operated according to an operation program stored in the memory unit (115) to control the operation of each circuit unit. Transmitting a ring tone to the corresponding local telephone when a call for the local telephone is generated; Requesting automatic redialing if there is no response even if the ring tone is transmitted a predetermined number of times; And retrieving and calling the number data associated with the counterpart according to the automatic redial request. The method of claim 2, The request for automatic redialing may include: operating a timer according to a predetermined redial timer value if there is no response for a predetermined time and is off-hook; And performing the automatic redial after the predetermined redial timer value has elapsed.