KR100260753B1 - Method and apparatus for call transfering - Google Patents

Abstract

PURPOSE: A call transfer method and an apparatus in a switching system are provided to recognize the current location of a mobile subscriber by using mobile subscriber identification information transmitted through a radio transmitting and receiving unit by a CPU and facilitate telephone communicating by transferring a call to the recognized location upon receipt of a call transfer request to the mobile subscriber. CONSTITUTION: A CPU determines whether a call is terminated from an office line or a different extension subscriber(31). If a call is determined to be terminated, the CPU controls a ring generator to transmit a ring to a phone set of a subscriber to which the call is to be terminated. The CPU determines whether the subscriber answers the phone or hooks off a phone set(32). If the CPU determines that the phone set is hooked off in response to the ring transmission, the CPU controls switching circuit to set up a telephone communication between a caller and a receiver(33). At this time, if the receiver desired by the receiver answers the phone, a call transfer request would not occur, and according telephone communication would be performed until a call completion request occurs(35). If a call transfer request occurs(34), the CPU confirms it and receives a phone number according to the call transfer request, that is, an extension subscriber number(36). The CPU searches for a location information registration table on a memory to determine whether the received extension subscriber number is searched(37). When the inputted extension subscriber number, that is, mobile subscriber ID information. is searched(38), the CPU reads a phone number stored related to the mobile subscriber ID information, controls the ring generator to transmit the ring to a phone set of the phone number(39).

Description

Call Transfer Method and Apparatus Using Wireless Transceiver in Switching System

The present invention relates to a method and apparatus for call transfer in an exchange system, and more particularly, to a method and apparatus for a subscriber to talk to an originator and to divert a call that is being called to another subscriber in response to an incoming call.

In general, exchange systems such as Private Automatic Branch eXchange (PABX) and Key Phone System (PABX) provide a variety of features that make it more convenient for subscribers to make calls or attempt to make calls. . For example, the exchange system provides subscribers with various functions such as redial, speed dial, hold, call transfer and paging functions. do.

The call transfer function is typically performed when a first extension subscriber talks with a caller (a local subscriber or an extension subscriber) and the caller wants to talk to a second extension subscriber. This can be done by pressing the toggle key + subscriber number). At this time, the first extension subscriber may be a subscriber that the caller actually wants to talk to, or a subscriber who receives a call on behalf of the missed subscriber because the subscriber who the caller wants to talk to is absent (going out, seating, etc.). It may be.

In any of the above cases, for the call transfer function to be performed normally, the first extension subscriber must know the telephone number of the second extension subscriber who the caller wants to call or the telephone number of the area where the second extension subscriber is located. In this case, when the first extension subscriber does not know the telephone number of the second extension subscriber or the telephone number of the area where the second extension subscriber is located, the first extension subscriber normally uses the premises broadcasting function to give the second subscriber. It can tell you that a call has been made. However, if the first extension subscriber does not exactly know the location of the second extension subscriber, it is disadvantageous that it takes a lot of time and trouble to transfer the call to several zones as well as to one zone when performing the zone broadcasting function. . If the broadcasts in these different areas are conducted in an environment where there are many people, such as offices, the broadcasts will act as a noise to others and cause discomfort. Moreover, even after such a cumbersome procedure, if the second extension subscriber does not hear the broadcast or the broadcast is not made in the area where the second extension subscriber is located, the call between the caller and the second subscriber cannot be normally made. In particular, even if the caller waits a lot of time, they will not be able to talk to the subscriber they want. The problems as mentioned above will be even greater if the second extension subscriber is a less mobile subscriber.

Accordingly, an object of the present invention is to provide a method and apparatus for quickly performing a call transfer operation in an exchange system.

Another object of the present invention is to provide a method and apparatus for allowing a call to be normally performed according to a call transfer operation in an exchange system.

It is another object of the present invention to provide a method and apparatus for removing noise generated during the operation of a call transfer in an exchange system.

It is still another object of the present invention to provide a method and an apparatus for performing an operation of call transfer under a comfortable environment in an exchange system.

The present invention for achieving these objects discloses a method and apparatus for calling using a radio transmitter and a radio receiver when calling an extension subscriber in a switching system. The wireless transmitter may be carried by a mobile subscriber who moves frequently in the switching system, and each transmitter transmits subscriber identification (ID) information at predetermined time intervals. The radio receiver is connected to at least one telephone located in a cell area having a preset radius, receives the subscriber identification information sent from the transmitter, and transmits the received subscriber identification information to the main device of the switching system through the telephone to which the subscriber is connected. send. The central processing unit of the main apparatus then stores the transmitted subscriber identification information and information about the telephone that transmitted the subscriber identification information in the memory as subscriber location information. In this state, when a call transfer request occurs after a call is received to a subscriber storing the subscriber identification information, the central processing unit uses the subscriber location information stored in the memory to determine the current location of the subscriber receiving the call. The call is diverted by sending a ring to the telephone at the current location.

According to the present invention, even when the subscriber is moving, the CPU can grasp the current location of the mobile subscriber and transfer the call to the identified location.

1 is a view showing a connection configuration of a call transfer device according to the present invention.

2 is a view showing a specific configuration of the radio receiver and the radio transmitter shown in FIG.

3 is a diagram illustrating a processing flow of a call transfer operation according to the present invention.

4 is a flowchart illustrating a process of location registration of identification (ID) information of an absent subscriber according to the present invention;

5 is a view showing an example in which a building is designed as a plurality of cell areas for a call transfer operation according to the present invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or chip designer, and the definitions should be made based on the contents throughout the present specification.

First, it will be appreciated that the present invention relates to an operation of switching the generated call when a call transfer request occurs in the exchange system as shown in FIG. It is well known to those skilled in the art that the main device 10 of the exchange system is configured as shown in FIG. That is, in FIG. 1, the main device 10 includes a trunk line circuit 11, a dual tone multi frequency (DTMF) receiver 12, a switching circuit 13, a subscriber circuit 14, a ring generator 15, and a central processing unit (CPU) 16. , Memory 17. In addition to the components shown in FIG. 1, the main apparatus 10 further includes a DTMF transmitter, a tone generator, and the like. However, in Figure 1 it should be noted that only the components related to the call switching operation of the present invention.

In FIG. 1, the central processing unit 16 controls the overall operation of the system such as controlling call switching and providing various services to the subscriber. The memory 17 stores programs and initial service data of the central processing unit 16 to perform basic calls and various functions, and temporarily stores data processed by the central processing unit 16. The memory 17 includes a read only memory (ROM) for storing program and service data and a random access memory (RAM) for temporarily storing data generated during program execution. The switching circuit 13 switches various tones and voice data under the control of the central processing unit 16.

The subscriber circuit 14 supplies a call current to the subscriber telephone under the control of the central processing unit 16 and at the same time interfaces the signal between the subscriber telephone and the switching circuit 13. The subscriber circuit 14 may be divided into a general telephone subscriber circuit and a digital telephone subscriber circuit, wherein the general telephone subscriber circuit is connected to a general telephone as a subscriber telephone, and the digital telephone subscriber circuit is a key phone telephone or an integrated information communication network (ISDN). An integrated services digital network (DEL) telephone enables data transmission, and a digital telephone including a liquid crystal display (LCD) and a plurality of function buttons is connected as a subscriber telephone. In FIG. 1, the subscriber circuit 14 only shows a case where the digital telephone 20 is connected as a subscriber telephone.

The ring generator 15 generates a ring signal and supplies it to the subscriber line. The trunk line circuit 11 forms a trunk line call loop by seizing the trunk line under the control of the central processing unit 16, and interfaces signals between the trunk line and the switching circuit 13. Here, the CO line means the line connecting the CO line 11 and the Central Office (C.O.). The DTMF receiver 12 analyzes the DTMF signal input from the switching circuit 13, converts the DTMF signal into digital data, and outputs the digital data to the central processing unit 16. Here, the DTMF signal received by the DTMF receiver 12 through the switching circuit 13 may be a telephone number generated by an external subscriber through a trunk line or a telephone number generated by an extension subscriber.

As described above, the components described above with reference to FIG. 1 are components that can be found in a general exchange system. However, in particular, the digital receiver 20 connected to the subscriber circuit 14 is wirelessly connected to the wireless receiver 30, and the corresponding wireless transmitter 40 is wirelessly connected to the wireless receiver 30. A location information registration table as shown in FIG. 4 is constructed in the RAM of the memory 17, and a program according to the processing flow as shown in FIG. 7 is stored in the ROM. The central processing unit 16 corresponds to the location information of the mobile subscriber by matching the subscriber identification (ID) information received through the wireless receiver 30 and transmitted through the digital telephone 20 with the telephone number of the digital telephone 20 transmitting the subscriber identification information. Store it in the location information registration table. In addition, the CPU 16 reads and executes a program according to the processing flow as shown in FIG. 3 from the ROM, and reads the contents stored in the location information registration table to perform a call switching operation according to the present invention. . Call transfer operation according to the present invention will be clearly understood from the description of FIG.

2 is a view showing in more detail the configuration of the wireless telephone 30 and the wireless transmitter 40 shown in FIG.

Referring to FIG. 2, the radio transmitter 40 may be carried by all the subscribers of the switching system or, preferably, by a mobile subscriber. The radio receiver 30 wirelessly receives information for identifying the subscriber carrying the radio transmitter 40. Perform the operation to send out. The radio transmitter 40 for this operation consists of an ID switch 42, a coder 43, an RF transmitter 44, a timer 45, an antenna AT and a battery 41. The battery 41 supplies operating power to the components of the radio transmitter 40. The ID switch 42 is an identification information setting switch that enables setting of identification information (ID). At this time, the subscriber ID information set by the ID switch 42 may be set to 8 bits or more to enable identification of any one subscriber among a plurality of subscribers, and may be a subscriber number. The coder 43 codes the subscriber ID information set by the ID switch 42 and outputs it as serial data. A radio frequency (RF) transmitter 44 converts serial data from the coder 43 into an RF signal. The antenna AT radiates the converted output by the RF transmitter 44 into the air. At this time, the signal transmission operation of the RF transmitter 44 may be controlled by a timer 45. The timer 45 may set a predetermined time, and outputs a signal indicating the signal to the RF transmitter 44 when the preset time is reached. The transmitter 44 converts the serial data from the coder 43 into a radio signal at each set time. That is, the RF transmitter 44 may periodically transmit a radio signal corresponding to the subscriber ID information. The radio signal transmission cycle may be performed according to the power consumption of the battery 41 and the frequency of work movement of the subscriber carrying the radio transmitter. It can be set at minute to 1 hour intervals.

The radio transmitter 40 may be selected from among many existing radio transmitters, and it is desirable to miniaturize in consideration of the simplicity of carrying a mobile subscriber. For example, a button-type micro transmitter can be used as the radio transmitter 40. In order to reduce the size of the radio transmitter 40, the RF transmitter 44 may use a 400 MHz band frequency of FM (Frequency Modulation) method, and a pattern antennae may be used as an antenna AT, and a battery 41 may be used as a battery AT. Three volt (V) batteries can be used.

The radio receiver 30 includes an antenna ANT, an RF receiver 31, and a digital telephone interface 32. The antenna ANT receives the RF signal of the 400MHz band emitted from the radio transmitter 40 and radiated to the air through the antenna AT. The RF receiver 31 receives the RF signal received from the antenna ANT, decodes it, and outputs decoded serial data. The digital telephone interface 32 is used to interface the wireless receiver 30 and the digital telephone 20. The serial telephone interface 32 converts serial data output from the RF receiver 31 into parallel data and transmits the parallel data to the digital telephone 20. The wireless receiver 30 receives the operating power (POWER) from the digital telephone 20.

The radio receiver 30 is connected to at least one of the telephones located in each cell area as shown in FIG. At this time, the telephone to which the wireless receiver 30 is connected is a digital telephone such as a key phone telephone or an ISDN telephone capable of receiving data transmitted from the wireless receiver 30. Such digital telephones have an LCD. The cell area is designed to have a predetermined radius, wherein each cell area may be designed in consideration of the location and number of subscriber telephones forming the extension. FIG. 5 illustrates an example in which a building of one floor is designed with three zones zones 1 to 3 and four cell regions CELLs 1 to 4. FIG. The zone is for distinguishing each office when a floor consists of three offices, and the cell is designed to have a radius that includes a small office. At this time, a wireless receiver is connected to at least one of the plurality of telephones included in each cell. And even if the subscriber carrying the wireless transmitter moves the offices shown in FIG. 5, the wireless transmitter can transmit the ID information of the mobile subscriber to either wireless receiver. Therefore, even if the subscriber moves, the ID information of the mobile subscriber transmitted from the wireless transmitter carried by the mobile subscriber can be transmitted to the main apparatus through the telephone after being received at any one wireless receiver. For example, referring to FIG. 5, when the subscriber is currently located in the CELL 1 area, the mobile subscriber's ID information (mobile subscriber's extension telephone number) set to the wireless transmitter carried by the subscriber is " 2001 " It is then sent to the main system of the switching system via the telephone having the telephone number of "2011". Therefore, the main unit of the switching system, and more specifically, the central processing unit 16 can determine in which cell area the mobile subscriber is currently located.

4 illustrates a case where a plurality of telephones are included in a cell area having a preset radius, and at least one telephone in the cell area is connected to a wireless receiver, and the mobile subscriber's current location information when the mobile subscriber is located in the CELL 1 area. Shows a processing flow stored in the location information registration table of the memory 17. At this time, it is assumed that the subscriber ID information is set to "2001" by the ID switch 42.

Referring to FIG. 4, when it is determined that the time is set by the timer 45 of the radio transmitter 40 (step 41), the RF transmitter 44 converts the mobile subscriber ID information coded by the coder 43 into an RF signal and transmits it ( Steps 42,43). The RF signal for this subscriber ID information will then be radiated through the antenna AT and received by the antenna ANT of the radio receiver 30. The RF receiver 31 of the radio receiver 30 receives and decodes an RF signal for mobile subscriber ID information received by the antenna ANT and outputs the serial signal (step 44). The digital telephone interface 32 converts the output serial data into parallel data and transmits the same to the digital telephone 20. The digital telephone 20 transmits the transferred subscriber ID information to the main device 10 (step 45). Then, the central processing unit 16 of the main unit 10 receives the transmitted subscriber ID information and stores it on the location information registration table of the memory 17. At this time, the central processing unit 16 can determine from which telephone the mobile subscriber ID information is transmitted, and stores the mobile subscriber ID information in correspondence with the telephone having the corresponding telephone number on the location information registration table. That is, the central processing unit 16 stores the mobile subscriber ID information together with the telephone number indicating the telephone that transmitted the mobile subscriber ID information as the location information of the mobile subscriber. Therefore, the central processing unit 16 reads the contents of the location information registration table so that the mobile subscriber with the ID information of " 2001 "

FIG. 3 shows a case where a call from a CO line or another extension subscriber is received by the subscriber while the location information registration table is stored, that is, the subscriber moves to the CELL 1 area, as shown in FIG. A diagram illustrating a processing flow that is switched to a subscriber.

In step 31 of FIG. 3, the central processing unit 16 determines whether a call from a current CO line or another extension subscriber is received. If it is determined that the call is received, the central processing unit 16 controls the ring generator 15 to send the ring to the subscriber telephone side to which the call is to be received. In response to this ring transmission, the central processing unit 16 then determines in step 32 whether the subscriber is answering the call, i.e. hooking the phone off. If it is determined in step 32 that the telephone is hooked off in response to the ring transmission, the central processing unit 16 controls the switching circuit 13 to make a call between the caller and the called party in step 33. At this time, if the called party who wants to call the call is answered, the transfer request will not occur. Accordingly, the call operation is requested to terminate the call (either the caller or the called party hooks on at step 35). Will be performed until it is determined to occur.

On the other hand, if a caller receives a call that the caller does not want to talk to, the caller will make a request to divert the call to the subscriber whom he wants to talk to, namely a transfer request. At this time, the call transfer request is normally input in the form of "special key (#) + extension number" or "conversion key (XFER) + # + extension number." In this case, the inputted subscriber number will be the same as the mobile subscriber ID information as described above. When the call transfer request occurs, the central processing unit 16 checks this in step 34 and then receives a telephone number corresponding to the call transfer request, that is, an extension subscriber number, in step 36. In operation 37, the CPU 16 searches the location information registration table on the memory 17 to determine whether the received extension subscriber number is retrieved. At this time, searching for the extension subscriber number means searching for mobile subscriber ID information. If it is determined in step 38 that the entered subscriber number, that is, mobile subscriber ID information, is retrieved, the central processing unit 16 reads the stored telephone number associated with the mobile subscriber ID information, and controls the ring generator 15 in step 39. The ring is sent to the telephone side having the read telephone number. In step 39, the central processing unit 16 transmits the ring and at the same time, the call information such as "CALL FOR XXXX" is displayed on the LCD of the telephone to which the ring is transmitted, that is, the call is switched. It can also be processed. The call is then transferred and the call information displayed on the LCD on the phone where the ring occurs, indicating that the subscriber has called. In this way, when the mobile subscriber hooks off the phone to answer the call in step 32, the call is made between the caller and the subscriber desired by the caller in step 33.

For example, as shown in FIG. 4, the location information registration table is stored, that is, the subscriber having a telephone number of "2001" moves to a CELL 1 area including a telephone having a telephone number of "2011". If a call is made to a telephone with a telephone number of "2001", the ring according to this call will ring to a telephone with a telephone number of "2001". At this time, if another subscriber or operator answers the call and then enters "# + 2001" to request a call transfer, the central processing unit 16 searches the location information registration table and the subscriber with the subscriber number of "2001" is currently CELL. It is determined that it is located in the 1 area. Central processing unit 16 then transfers the call to a telephone having a telephone number of " 2011 " in the determined CELL 1 area to generate a ring so that the subscriber can call the caller through the telephone having a telephone number of " 2011 ". Will be able to.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention can determine the current location of the mobile subscriber using the mobile subscriber identification information transmitted through the wireless transceiver even when the subscriber is moving. Accordingly, the central processing unit has an advantage in that the call is easily made by making the call switch to the identified position even when a call transfer request to the mobile subscriber occurs.

Claims (10)

A plurality of telephones in each cell area having a predetermined radius are accommodated as an extension, and at least one telephone located in each cell area is connected to a wireless receiver for receiving a radio signal and can set subscriber identification information. In the call switching method of the exchange system comprising a radio transmitter for transmitting the set subscriber identification information as a radio signal, and at least a memory for storing the information, When the subscriber of the switching system moves away from his / her seat and moves to any one of the cell areas, the subscriber identification information transmitted after being set in the wireless transmitter carried by the mobile subscriber is transmitted to the wireless receiver. Transmitting through a radio receiver in proximity to the transmitter and a telephone connected to the radio receiver, Storing the transmitted subscriber identification information and information on the telephone that transmitted the subscriber identification information as the location information of the mobile subscriber in the memory; Determining whether a transfer request for the incoming call occurs after a call from an extension line of the trunk line or any of the exchange systems is received by the mobile subscriber's telephone; When it is determined that the switching request for the incoming call has occurred, it is determined by which phone the mobile subscriber is currently located by using the location information of the mobile subscriber stored in the memory, and the generated call is sent to the determined telephone. A method characterized in that the conversion is made to the incoming call. Claims [1] A call transfer method of an exchange system connected to a trunk line and accommodating a plurality of telephones as an extension and having at least a memory for storing information. A first step of identifying telephones located within a predetermined radius of the plurality of telephones and connecting a wireless receiver for receiving a radio signal to at least one of the identified telephones; A second step of setting identification information of the mobile subscriber to a wireless transmitter carried by a subscriber moving out of his / her seat among the subscribers of the plurality of telephones; A third step of periodically transmitting identification information of the mobile subscriber set on the wireless transmitter; A fourth process of transmitting the identification information of the mobile subscriber through the wireless receiver to which the wireless transmitter is in proximity and the telephone to which the wireless receiver is connected; A fifth process of storing the transmitted identification information of the mobile subscriber in the memory together with the telephone number of the telephone that transmitted the identification information of the mobile subscriber; A sixth process of determining whether the mobile subscriber's telephone is hooked off when a call is received from the trunk line or any one of the plurality of telephones to the mobile subscriber's telephone; A seventh process of determining whether a call transfer request occurs on the mobile subscriber's phone after the mobile subscriber's phone is hooked off; An eighth step of determining whether a telephone number is input together with the call transfer request when it is determined that the call transfer request has occurred; A ninth process of searching for identification information of a mobile subscriber having the same phone number as the inputted phone number in the memory, when it is determined that the telephone number is input in the eighth process; If it is determined in step 9 that the mobile subscriber's identification information that is identical to the input telephone number is found in the memory, a tenth step of transmitting a ring to a telephone having a stored telephone number corresponding to the mobile subscriber's identification information is performed. Call transfer method characterized in that made. The telephone set according to claim 2, wherein the telephone to which the wireless telephone is connected is provided with a liquid crystal display, and a message indicating that the ring is sent out on the liquid crystal display of the telephone at which the ring is sent at the same time as the ring is sent. Displaying the call transfer method. In the call transfer device of the switching system: A plurality of telephones each located in a plurality of cell areas structured to have a predetermined radius and connected to the switching system by extension; A wireless transmitter which can be carried by a mobile subscriber and which wirelessly transmits information for identifying the subscriber; A plurality of radio receivers connected to at least one of the telephones located in each cell area, for receiving the subscriber identification information transmitted from the radio transmitter located in its cell area and transmitting the received subscriber identification information to a corresponding phone; Each of the radio receivers stores information about a telephone to which the radio receiver is connected, and when the subscriber identification information is transmitted from a radio receiver of the plurality of radio receivers through a phone corresponding to the radio receiver, the subscriber identification information under predetermined control. A memory for storing corresponding to the corresponding telephone; Controlling the operation of storing subscriber identification information in the memory, and when a call transfer request to the mobile subscriber occurs, using the subscriber identification information stored in the memory to connect a radio receiver among the telephones in the cell area where the subscriber is located; And at least a control unit for controlling the incoming call by switching the call to the telephone. The method of claim 4, wherein the wireless transmitter, An identification setting switch for allowing a mobile subscriber to set this subscriber identification information; A coder for coding subscriber identification information set by the identification information setting switch and outputting the serial identification data; A transmitter for converting serial data from the coder into a radio signal; Apparatus comprising an antenna for radiating the conversion output by the transmitting unit to the air. 6. The apparatus of claim 5, wherein the antenna is a pattern antenna. The apparatus of claim 5, wherein the transmitter converts the serial data from the coder into a wireless signal of 400 MHz. The timer of claim 5, wherein a predetermined time can be set, and when the set time is reached, the timer outputs a signal indicating the signal to the transmitting unit so that the transmitting unit converts serial data from the coder into a wireless signal at each setting time. The apparatus further comprises. The method of claim 5, wherein each of the wireless receiver, A receiver for receiving a radio signal transmitted from the radio transmitter and decoding the received radio signal to output decoded serial data; And an interface which is connected to at least one of the telephones located in each cell area and converts serial data output from the receiver into parallel data and transmits the parallel data to the connected telephone. 5. The apparatus of claim 4, wherein a telephone connected to each of the wireless receivers among the telephones located in each cell area is a digital telephone capable of receiving parallel data transmitted from each of the wireless receivers.