KR20030056994A - Method and Apparatus for Call-Back Function of Junction line using PRI in PBX - Google Patents

Abstract

According to the present invention, when a subscriber calls an external subscriber by occupying a PRI relay line, if the external subscriber is busy, the subscriber registers a relay line callback function and automatically dials the number dialed by the subscriber after waiting for a predetermined time. And a method and apparatus for a relay line callback function using a PRI in a private exchange which automatically connects a call of the external subscriber with the call.

According to the present invention, a subscriber interface unit for receiving and transmitting a PRI relay line assignment request command from a caller, a PRI relay line controller for searching for and extracting an unused PRI relay line according to the transmitted PRI relay line assignment request command, Inquiring the caller whether to use the PRI trunk line callback function, and when a command to use the trunk line callback function is received from the caller, the caller stores the caller number and the called party number, waits for a predetermined time by operating a timer, and then calls the called party. Including the extension control unit to search whether or not, even if the called party can be automatically connected in the system without the inconvenience of trying to call several times.

Description

Method and Apparatus for Call-Back Function of Junction line using PRI in PBX}

In the present invention, when a subscriber calls an external subscriber by occupying a Primary Rate Interface in ISDN (PRI) relay line in the private exchange, if the external subscriber is busy, the subscriber dials the number after the subscriber registers a relay line callback function and waits for a predetermined time. The present invention relates to a method and an apparatus for a relay line callback function using a PRI in a private exchange which automatically sends a call to automatically connect a call between the subscriber and the external subscriber.

The private exchange is a telephone exchange system for all employees to share a certain number of external telephone lines used in the company, and to automatically connect telephones between internal users connected to the extension. The primary goal of using a private exchange is to reduce the cost of assigning a regular telephone line to all employees of the company.

In the step of making a call connection in the telephone network, the exchange finds an empty digit receiving signal device to connect to the subscriber line in order to handle the caller's call request, and then transmits a dial tone to the caller to start dialing.

When the caller hears the dial tone and starts dialing, the dial tone transmission is interrupted and continues to receive subsequent dial digits. If all dialed digits have been received or no dialing has been made for a certain period of time, the receiving device will recover and be in standby to meet the calling needs of other subscribers. If the relay line signaling between stations between the exchanges is R2, the station number is analyzed to select the relay line route based on the received digits.

After occupying an empty line among the group of relay lines connected to the destination exchange, connect an empty inter-station signaling device and notify the receiving exchange side located in the far end so that the inter-station signaling device is connected.

When reception of the called party number is terminated at the called exchange, the calling party checks the line state of the called party and sends a ring tone or busy tone to the caller according to the type. When the caller hears the ringing tone and the caller answers by picking up the handset of the telephone, the call signal and the ringing tone are interrupted and the separate call line is connected and the call is available.

In order to use the trunk line callback function by using an analog trunk line in a private exchange, an additional device for recognizing a busy tone is installed. When the caller attempts to make an external call by occupying the relay line, the tone recognizing device is assigned to the relay line port to prepare for recognizing the caller's state as a tone.

When the tone recognition device recognizes the busy tone of the called party, the busy state message is transmitted to the caller. The caller may register a callback function for the call with the called party. If the callback function is registered as described above, the tone recognition device may periodically call the called party whose relay line callback function is registered.

When a call tone is heard from the called party, the tone recognition device transmits a call status message to the caller side system, and the caller side system rings a caller who has registered a trunk line callback, and when the caller answers, Switch. The caller hears the ring tone of the other party and the call is made when the called party answers.

In the related art, since an analog relay line is used, it is inconvenient to attach an external device for recognizing a tone coming from a power exchange to recognize a called party state.

In addition, in the case of using an analog relay line, there is a problem that it is not easy to recognize the status of the called party.

In addition, there is a problem that the reliability of the analog device is much lower than the digital relay line.

Accordingly, an object of the present invention is to use a PRI in a private exchange that can be automatically connected to the system by eliminating the inconvenience of attempting multiple calls, if the caller registers a relay line callback function when the called party is in a call, when the called party is called. The present invention provides a method and apparatus for relay line callback function.

Another object of the present invention is to provide a method and apparatus for a relay line callback function using PRI in a private exchange that can easily recognize a state of a counterpart because of using a digital relay line.

Another object of the present invention is to provide a method and apparatus for a relay line callback function using PRI in a private exchange capable of recognizing a state of a counterpart only by a private exchange without a separate device for recognizing a state of a counterpart.

1 is a block diagram of a system for a relay line callback function according to an embodiment of the present invention.

2 is a block diagram of a system for a relay line callback function using a PRI in an originating private exchange according to an embodiment of the present invention;

3 is a flowchart illustrating an interworking structure for a relay line callback function using a PRI in a private exchange according to an embodiment of the present invention.

4 is a flow chart for a relay line callback function using PRI in a private exchange according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100, 200: Caller 110, 130, 210: Switchboard

120, 220: public telephone network (PSTN) 140: called party

212: SLC (Single Line Circuit) 214: station control unit

216: PRI relay line control unit 218: CPRM (CEPT PRI Board)

According to an aspect of the present invention to achieve the above object, in the apparatus using a relay line callback function in a private exchange, the subscriber interface unit for receiving and transmitting a PRI relay line allocation request command from the sender, the transmitted PRI relay line allocation PRI relay line control unit for searching and extracting unused PRI relay lines according to the request command, and when the called party is busy, the caller is queried whether the PRI trunk line callback function is used, and when the relay line callback function usage command is received from the caller, After storing the calling party number and the called party number, waiting a predetermined time by operating a timer, an apparatus for relay line callback function using a PRI may be provided in a private exchange including an extension control unit for searching whether the called party has a call. .

The receiving unit receiving a PRI relay line assignment request command from the caller may include receiving a called party number that the caller wants to call.

According to another aspect of the present invention for achieving the above objects, in a method for a trunk line callback function using PRI in a private exchange, receiving a PRI trunk line assignment request command from a sender, and not using it according to the PRI trunk line assignment request command; After searching for and extracting a PRI relay line, the receiver receives a called party number from the caller to search whether the called party is busy. If the called party is busy, the caller is queried whether the PRI relay line callback function is used. When the caller using the relay line callback function is received from the caller, the caller ID and the called party number are stored, and when a predetermined waiting time elapses by operating a timer, the called party number is extracted to determine whether the called party is busy. If the called party is not busy, caller will be called. When transmitting and receiving the off-hook information from the caller, it is possible to provide a method for the trunk callback function using the PRI from the private branch exchange comprising the call on the called party and the.

When a predetermined waiting time has elapsed by operating the timer, extracting the called party number to determine whether the called party is busy or not, by sending a PRI relay line assignment command, extracting an unused PRI relay line, and assigning a PRI relay line. And extracting the called party number corresponding to the calling party number, determining whether the called party is in a call, and determining whether the calling party is in a call.

If the called party is not busy, sending a call signal to the caller, and when off-hook information is received from the caller, establishing a call path with the called party may include checking whether the caller is busy. have.

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

1 is a block diagram of a system for relay line callback function according to an embodiment of the present invention.

Referring to FIG. 1, a system for a relay line callback function includes a caller 100, a caller private exchange 110, a public switched telephone network (PSTN) 120, a caller switch 130, and a caller 140. can do.

The originating private exchange 110 may serve to receive an off hook signal and a called party number transmitted from a plurality of senders and transmit the received number to the PSTN 120.

In addition, the calling side private exchange 110 may serve to establish a call path between the caller 100 and the called party 140. For a detailed description of the originating private exchange 110, see FIG.

The public switched telephone network (PSTN) 120 is a public telecommunication network, and may transmit call connection request information to the called side exchange 130 corresponding to the called party number transmitted from the calling side private exchange 110.

The destination exchange 130 may determine whether the called party number is called by allocating a channel corresponding to the called party number transmitted from the PSTN 120.

If the called party number is recognized as busy, the called party exchange 130 may transmit a busy signal of the called party 140 to the PSTN 120. Here, the PSTN 120 receiving the busy signal of the called party 140 may transmit the busy signal of the called party to the calling-side private exchange 110.

If the called side exchange 130 checks whether the called party number is in a call, the called side exchange 130 may transmit a call enabled signal to the PSTN 120 if it is not in a call.

2 is a block diagram of a system for a relay line callback function using a PRI in an originating private exchange according to an embodiment of the present invention.

Referring to FIG. 2, a system for a relay line callback function using PRI in an originating private exchange may include a caller 200, a private exchange 210, and a PSTN 220.

The caller 200 may be in an off hook state at the same time as lifting the phone.

The private exchange 210 may include a single line circuit (SLC) 212, an extension controller 214, a PRI relay line controller 216, and a CPPT PRI board 218.

The SLC 212 is an analog subscriber board and may serve to interface with a terminal and an exchange. In addition, the SLC 212 may receive an off-hook signal transmitted from the caller 200 and transmit the received off-hook signal to the extension controller 214.

The extension control unit 214 may receive the off-hook signal transmitted from the SLC 212 to check the information of the caller 200. The caller information may be an extension number of the caller 200. For example, if the extension number of the caller 200 is '100', the extension control unit 214 may recognize the extension number of the caller 200 as '100'. After confirming the caller information, the extension controller 214 may transmit a PRI relay line assignment command to the PRI relay line controller 216 according to the received off-hook signal.

The PRI trunk line assignment command 216 may be a relay line assignment command required for the caller 200 to talk to the called party.

In addition, when the called party is busy, the extension controller 214 may query the caller 200 whether to use a relay line callback function.

If the caller 200 wants to use the relay line callback function, the extension control unit 214 may receive a command to use the relay line callback function from the caller 200. The relay line callback function use command is designated by the developer as an example, and may be, for example, pressing a '* 11 *' button on the phone.

The extension control unit 214 may store the caller number and the called party number when receiving the relay line callback function use command from the caller 200. Here, the calling party number and the called party number may be stored in the storage unit of the extension control unit 214.

The storage unit may store at least one of a calling party number, a called party number, a waiting time, and the number of accesses.

In addition, the extension control unit 214 may include a timer that can periodically call the called party by the relay line callback function. That is, when the caller 200 uses the relay line callback function, the timer may function to check the call state of the called party after waiting for a predetermined time.

In addition, the extension control unit 214 may retrieve and extract the called party number called by the caller 200 in the storage unit when a predetermined time has elapsed by the operation of the timer.

The PRI trunk line controller 216 may search for and allocate an unused channel according to the PRI trunk line assignment command transmitted from the extension controller 214.

In addition, the PRI trunk line controller 216 may receive a caller confirmation from the extension controller 214 and transmit it to the called party exchange. Then, the PRI trunk line control unit 216 may receive the call information of the called party from the called party exchange and transmit the received information to the extension control unit 214.

The CPRM 218 may be in charge of the interface between the PRI relay line and the PSTN 220.

Hereinafter, a detailed description of the relay line callback using PRI in the private exchange will be given with reference to FIG. 3.

3 is a flowchart illustrating an interworking structure for a trunk line callback function using a PRI in a private exchange according to an embodiment of the present invention.

Referring to FIG. 3, after a caller performs an off hook of a telephone, for example, the caller transmits a connection request signal to the extension controller by pressing a button '9' among telephone buttons. Then, the caller may select a called party number to be called and transmit it to the extension controller (S300). By selecting the called party number of the caller, the caller may transmit a PRI relay line assignment request command to the extension controller (S302).

The extension control unit may transmit a PRI relay line assignment command to the PRI relay line controller (S304). The PRI relay line control unit may receive the PRI relay line assignment command, search whether there is an unused PRI relay line, and extract an unused PRI relay line (S306).

The PRI trunk line controller may transmit the extracted PRI trunk line information to the extension controller (S308). When the PRI relay line is secured as described above, the extension control unit may search whether the called party is in the call (S310).

To this end, the extension control unit may transmit a call confirmation command to the called party's exchange (S312). The caller confirmation command may be transmitted to the called party's exchange via a PRI relay line controller, CPRM.

The called party's exchange having received the called party's call confirmation command may determine whether the called party's call is in operation S314.

If the called party determines that the called party is busy as a result of step 314, the called party exchange may transmit the busy signal of the called party (for example, in the form of a 'to' or 'to') to the extension controller (S316).

After step 316 is performed, the extension control unit may query the caller whether to use a relay line callback function (S318). As a result of step 318, if the caller wants to use the trunk line callback function, the caller may transmit a command to use the trunk line callback function to the extension controller (S320).

The use of the trunk line callback function may be predetermined by the system developer in the form of pressing a button of '* 11 *' of the telephone, for example.

The extension control unit receiving the relay line callback function use command may store the caller's number and the called party's number (S322).

The caller's number and the called party's number are stored in a storage unit in the extension control unit. The storage unit may include at least one of a calling party number, a calling time, a called party number, a waiting time, and the number of times of connection.

After performing step 322, the extension controller may operate a timer for periodically calling the called party after waiting for a predetermined time (S324).

While waiting for a predetermined time, when the waiting time is completed, the extension control unit may extract the called party number corresponding to the calling party number (S326).

When the called party number is extracted, the extension control unit may transmit a PRI relay line assignment command to the PRI relay line control unit in order to set the called party number and the relay line (S328). The PRI relay line controller may receive a PRI relay line assignment command to check whether there is an unused PRI relay line and extract an unused PRI relay line (S330). The PRI trunk line controller may transmit the extracted PRI trunk line information to the extension controller (S332).

When the PRI relay line is secured as described above, the extension control unit may transmit a call confirmation message to the called party's exchange to confirm the call of the called party (S334). The caller confirmation command may be transmitted to the called party's exchange via a PRI relay line controller, CPRM.

The called party's exchange having received the called party's call confirmation command may determine whether the called party's call is in operation S336.

If it is determined in step 336 that the called party is not in a call, the called party exchange may transmit a caller on-hook status signal to the extension controller (S338).

The extension control unit receiving the on-hook state signal of the called party may transmit a call signal to the caller (S340). The call signal may be to ring the caller's telephone. When the caller receiving the call signal is off-hook (SH342), the call line may be established with the automatically-received PRI relay line (S344). If the called party answers while the caller hears the ringing tone of the called party's exchange, a call can be made.

4 is a flowchart illustrating a relay line callback function using PRI in a private exchange according to another embodiment of the present invention.

Referring to FIG. 4, when a caller performs an off hook of a telephone, a call tone is transmitted to the caller. Then, the called party number desired to be called from the caller may be received (S400).

After receiving the called party number from the caller, the PRI relay line assignment command may be transmitted to the PRI relay line controller (S405). Upon receiving the PRI relay line assignment command, the PRI relay line controller may search for an unused channel among the PRI relay lines and allocate a PRI relay line (S410).

If the PRI relay line is allocated as described above, it is possible to search whether the received called party number is busy (S415). If the called party number is busy as a result of the determination in step 415, the caller may be queried whether the relay line callback function is used (S425).

If the caller wants to use the trunk line callback function, after receiving the relay line callback function use command from the caller, the caller number and the called party number may be stored (S430).

After the execution of step 430, the timer is operated, and if a predetermined predetermined waiting time has elapsed (S435), the called party number can be transmitted to the called party's exchange by occupying the PRI relay line (S440).

The called party exchange may determine whether the called party number is busy (S445). As a result of the determination in step 445, if the called party number is not in a call, it may be determined whether the caller is in a call (S450).

If it is determined in step 450 that the caller is not busy, a call signal may be transmitted to the caller (S455). If it is determined in step 450 that the caller is busy, step 435 may be performed.

After performing step 455, when off-hook information is received from the caller (S460), a call path with the called party may be established (S465).

If the called party answers while the caller hears the ring tone of the called party's exchange, the call is made.

If it is determined in step 415 that the called party number is not busy, step 465 may be performed.

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, according to the present invention, when calling a subscriber of the exchange, if the called party registers the relay line callback function because the caller is busy, the PRI is removed from the private exchange that can be automatically connected to the system by eliminating the inconvenience of attempting multiple calls. It is possible to provide a method and apparatus for a relay line callback function.

In addition, according to the present invention, a method and an apparatus for a relay line callback function using PRI in a private exchange that can easily recognize a state of a counterpart using a digital relay line can be provided.

In addition, according to the present invention, it is possible to provide a method and apparatus for a relay line callback function using PRI in a private exchange capable of recognizing a state of a counterpart only by a private exchange without a separate device for recognizing a state of a counterpart.

Claims (5)

In the apparatus using the relay line callback function in a private exchange, A subscriber interface unit for receiving and transmitting a PRI relay line assignment request command from a caller; A PRI trunk line controller for searching for and extracting unused PRI trunk lines according to the transmitted PRI trunk line assignment request command; And When the called party is busy, the caller is queried whether the PRI trunk line callback function is used, and when a command to use the trunk line callback function is received from the caller, the caller number and the called party number are stored, and the timer is operated and then waited for a predetermined time. An extension controller for searching whether the called party is in a call Apparatus for a relay line callback function using a PRI in a private exchange comprising a. The method of claim 1, And a subscriber interface unit receiving and transmitting a PRI relay line assignment request command from the caller, receiving a called party number for which the caller wants to make a call. In a method for relay line callback function using PRI in a private exchange, Receiving a PRI trunk line assignment request command from the originator; Searching for and extracting unused PRI relay lines according to the PRI relay line assignment request command; Receiving the called party number desired to be called from the calling party and searching whether the called party is busy; If the called party is busy, inquiring whether the caller uses a PRI relay line callback function; Storing a caller number and a called party number if a command to use a relay line callback function is received from the caller; Determining whether the called party is busy by extracting the called party number when a predetermined waiting time elapses by operating a timer; and If the called party is not in a call, transmitting a call signal to the caller, and when off-hook information is received from the caller, establishing a call path with the called party. Method for relay line callback function using PRI in a private exchange comprising a. The method of claim 3, When a predetermined waiting time elapses by operating a timer, extracting the called party number and determining whether the called party is busy Allocating a PRI relay line by extracting an unused PRI relay line by transmitting a PRI relay line assignment command; Extracting a called party number corresponding to the calling party number; Determining whether the called party is in a call; And And determining whether the caller is busy or not. The method for relay line callback function using PRI in a private exchange. The method of claim 3, If the called party is not busy, sending a call signal to the caller, and when off-hook information is received from the caller, setting up a call path with the called party Checking whether the caller is busy; If the caller is not in a call, transmitting a call signal to the caller, and when off-hook information is received from the caller, establishing a call path with the called party. Method for trunk line callback function.