Call control system and call control method

Abstract

To provide a call control system and a call control method, where in the case that simultaneous calls are performed for a staff using nurse calls from users in caring or nursing, the staff takes appropriate measures depending on priority of the calls.SOLUTION: A call control system comprises: call slave units 10 with which a call is made from a user; an IP-PBX 100; a portable terminal 30 carried by a staff performing caring service or nursing service; and a radio AP device 20 for calling the portable terminal 30 and performing communication by radio. The IP-PBX100 stores caring information or nursing information on each user; calculates response priority for each user from the caring information or nursing information; and, when the portable terminal 30 is called from a call slave unit 10, creates incoming call display data containing response priority for each user and transmits the incoming call display data to the called portable terminal 30. The portable terminal 30 displays an incoming call display screen including the response priority for each user.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a call control system and a call control method, and more particularly to a call control system and a call control method suitable for allowing staff to respond appropriately in accordance with the priority of calls made simultaneously by nurse calls from users in caregiving or nursing. [Background technology]

[0002] In nursing homes, hospitals and other facilities that require care and nursing for users, a system has become widespread in which an IP private branch exchange (hereafter referred to as "IP-PBX" (Internet Protocol - Private Branch eXchange)) is installed within the facility, and when a so-called nurse call is made by a user, the call is received via the IP-PBX on the mobile device such as a smartphone of the caregiving staff.

[0003] A system in which a patient makes a nurse call via an IP-PBX and an alarm is sent to staff is described in, for example, Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-77522 A Summary of the Invention [Problem to be solved by the invention]

[0005] The nurse call system described in the above-mentioned Patent Document 1 generates alarm information from the patient's bedside, and the IP-PBX acquires the call history and, based on that, transmits a push-type alarm message to the staff's IP phone.

[0006] Incidentally, with current IP-PBXs, when there are simultaneous calls from multiple handsets, the call that arrives first is usually given priority and displayed on the called terminal, so the next call cannot be answered until the displayed call is answered.

[0007] In other words, in a system in which a nurse call system and an IP-PBX are integrated as in Patent Document 1, if an emergency user and a non-emergency user call simultaneously and the non-emergency user arrives first, the staff will not be able to immediately respond to the emergency user's call.

[0008] In this way, in the conventional technology, the first incoming call is displayed on the staff member's mobile terminal, and other calls are displayed in order and can be answered after the displayed call is answered. The priority of users to be answered is left to the experience of the person answering.

[0009] To provide a call control system and a call control method suitable for allowing staff to respond appropriately according to the priority of calls made simultaneously by nurse calls from users in caregiving or nursing. [Means for solving the problem]

[0010] The call control system of the present invention is preferably a call control system that responds to calls from users in a care facility or nursing care facility, and has a call handset that receives calls from users, an IP-PBX (Internet Protocol - Private Branch eXchange), a mobile terminal carried by staff providing care or nursing services, and a wireless AP (Access Point) device that calls the mobile terminal and communicates wirelessly, the call handset, IP-PBX, and wireless AP device are interconnected, the IP-PBX holds care or nursing information for each user, and calculates a response priority for each user from the care or nursing information, and when the mobile terminal is called from the call handset, the IP-PBX generates incoming call display data including the response priority for each user and transmits the incoming call display data to the called mobile terminal, and the mobile terminal displays an incoming call display screen including the response priority for each user. Effect of the Invention

[0011] According to the present invention, it is possible to provide a call control system and a call control method that are suitable for enabling staff to respond appropriately according to the priority of calls made simultaneously by nurse calls from users in caregiving or nursing. [Brief description of the drawings]

[0012] [Figure 1] 1 is an overall configuration diagram of a call control system according to an embodiment; [Diagram 2] This is a diagram of the hardware and software configuration of an IP-PBX. [Diagram 3] FIG. 11 is a diagram illustrating an example of a call control table. [Figure 4] FIG. 11 illustrates an example of a user information table. [Diagram 5] FIG. 4 is a diagram showing an example of a call history. [Figure 6] FIG. 13 is a diagram showing an example of an incoming call screen of a smartphone. [Figure 7A]13 is a flowchart showing an incoming call process. [Figure 7B] 10 is a flowchart showing an incoming call response / disconnection process. [Figure 8A] FIG. 1 is a diagram illustrating an example of the contents of the incoming call queue when the IP-PBX controls calls, the display on the smartphone for the staff, and the staff's response (part 1). [Figure 8B] This is a diagram (part 1) that explains the contents of the incoming call queue when the IP-PBX controls calls, the display on the smartphone for the staff, and an example of the staff's response. [Figure 8C] This figure explains the contents of the incoming call queue when the IP-PBX controls calls, the display on the smartphone for the staff, and an example of the staff's response (part 3). [Figure 9] 13 is a flowchart showing a response priority process performed by the IP-PBX. [Figure 10A] This is a diagram that explains the series of events from when a user makes a nurse call to when a staff member responds (part 1). [Figure 10B] This is a diagram that explains the series of events from when a user makes a nurse call to when a staff member responds (part 2). [Figure 10C] This diagram explains the sequence of events from when a user makes a nurse call to when a staff member responds (part 3). [Figure 10D] This diagram explains the sequence of events from when a user makes a nurse call to when a staff member responds (part 4). [Figure 10E] This diagram explains the sequence of events from when a user makes a nurse call to when a staff member responds (part 5). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 10E.

[0014] First, an overview of the configuration and processing of a call control system according to an embodiment will be described with reference to FIG. In this embodiment, a call control system in a care facility will be explained as an example, however, the present invention can also be applied to cases where a user makes a nurse call and staff (caregivers, nurses) provide care and nursing services, such as in a hospital that houses a patient.

[0015] The call control system of this embodiment includes a nurse call handset 10, a wireless AP (Access Point) device 20, a smartphone 30, an IP-PBX 100, and a care management server 200, all of which are installed in a care facility, as shown in FIG.

[0016] The nurse call handset 10 and the IP-PBX 100 are connected by an internal telephone line 5, and the IP-PBX 100 and the wireless AP device 20 are connected by a LAN 7 (Local Area Network), so that a user (a person receiving nursing care services) can call a smartphone 30 carried by a staff member of the nursing facility (a person in charge of providing nursing care services to the user) by calling the nurse call handset 10. The wireless AP device 20 calls the smartphone 30 from the nurse call handset 10 using a wireless protocol of an existing WiFi standard (e.g., IEEE802.11a, b, g, n, ac, etc.), and the staff member operates the smartphone 30 to answer the call, enabling a conversation with the called user.

[0017] The IP-PBX 100 is a device having a function of receiving a call from the nurse call handset 10, performing line switching, and calling the smartphone 30 by an IP protocol.

[0018] The IP-PBX 100 has the following functional units: a call control unit 110 , a care information receiving unit 120 , a response priority calculation unit 130 , and an incoming call screen data processing unit 140 .

[0019] The call control unit 110 is a functional unit that performs call origination, call reception, and exchange. The care information receiving unit 120 is a functional unit that receives care information from the care management server 200. The response priority calculation unit 130 is a functional unit that calculates a response priority (details will be described later) that is determined for each user. The incoming call screen data processing unit 140 is a functional unit that creates data for a display screen when an incoming call is received from the nurse call handset 10 to the smartphone 30.

[0020] The smartphone 30 is a mobile terminal carried by the staff member to receive the nurse call handset 10, and has a normal calling function as well as a function to display the call information of the nurse call handset 10. The mobile terminal carried by the staff member may be, for example, a laptop-type PC (Personal Computer) or tablet, as long as it is capable of implementing a calling function and an information display function.

[0021] The care management server 200 holds a care DB (Data Base) 210 and is a server for managing the care information of the user. The care management server 200 can be implemented by an information processing device such as a normal server device. The care management server 200 is connected to the IP-PBX 200 via the LAN 7, and periodically transmits the care information of the user to the IP-PBX 200 by a care information transmission program (not shown) with a set time schedule.

[0022] The care management server 200 has the following functional units: a care information management unit 220 , a care information transmission unit 230 , and a care information input unit 240 .

[0023] The care information management unit 220 is a functional unit that manages the care information in the care DB 210. The care information transmission unit 230 is a functional unit that transmits the care information to the IP-PBX 100. The care information input unit 240 is a functional unit that inputs the care information of the user to the care management server 200 via an input / output device or a network. Specific examples of care information for users will be described in detail later.

[0024] Next, the hardware and software configuration of the IP-PBX will be explained using FIG. As shown in FIG. 2, the IP-PBX 100 is composed of a CPU (Central Processing Unit) 300, a main memory 302, a flash memory 304, an internal line I / F (Interface) 306, and a network I / F 308, all of which are interconnected by a bus.

[0025] The CPU 300 is a processor that controls the overall operation of the IP-PBX 100, and executes various processes for the entire IP-PBX 100 by referencing control programs and data such as tables loaded in the main memory 302 and executing control programs (not shown).The CPU 300 also provides the call control processing function of this embodiment by executing application programs described below.

[0026] The main memory 302 is composed of semiconductor elements such as a DRAM (Dynamic Random Access Memory), and is used to store various control programs such as an exchange operation control program and various control information such as extension number information of the IP-PBX 100, and is also used as a work memory for the CPU 300 that stores information used temporarily when executing an exchange operation. Although not shown in the figure, the control programs and tables are stored in auxiliary storage devices such as a flash memory 304 or a HDD (Hard Disk Drive) (not shown), and are loaded into the main memory 302 at the time of execution.

[0027] The network I / F 308 is an interface circuit with the LAN 7, and is connected via this to the wireless AP device 20 and various network devices.

[0028] The extension I / F 120 is a hardware circuit that accommodates the extensions of the IP-PBX 100 and monitors the answering signals of the connected extensions and the state of the call termination lines.

[0029] The flash memory 304 has installed therein a call control program 311 for executing the call control process of this embodiment, a care information receiving program 312, a response priority calculation program 313, and an incoming call screen data processing program 314.

[0030] The call control program 311, the care information receiving program 312, the response priority calculation program 313, and the incoming call screen data processing program 314 are programs for realizing the functions of the call control unit 110, the care information receiving unit 120, the response priority calculation unit 130, and the incoming call screen data processing unit 140, respectively.

[0031] Additionally, the flash memory 304 stores a call control table 400, a user information table 410, and a call history 420. The details of each table will be described later.

[0032] Next, the data structure used in the call control system will be described with reference to FIGS.

[0033] The call control table 400 is a table for managing the calling numbers and called numbers of the IP-PBX 200, and as shown in FIG. 3, has fields for calling number 400a and called number 400b.

[0034] The calling number 400a is an extension number sent from the nurse call handset 10. The called number 400b is an extension number of a smartphone carried by a staff member who receives a call when called from the nurse call handset 10 with the extension number described in the calling number 400a. In the example of FIG. 3, the concept of an incoming call group is adopted, and one incoming call group includes multiple extension numbers, and the IP-PBX 200 is set to receive the call at any of the available extension numbers. In other words, it is assumed that one of the staff members carrying an extension number assigned to one incoming call group is in a position to care for the called user.

[0035] The user information table 410 is a table for storing information about users in a care facility, and as shown in FIG. 4, has fields for user ID 410a, user name 410b, extension number 410c, response priority 410d, care level 410e, vital signs information 410f, independence level 410g, excretion timing 410h, and injury or illness 410i.

[0036] The user ID 410a stores an identifier that can uniquely identify a user of the nursing care facility. The user name 410b stores the name of the user. The extension number 410c stores an extension number assigned to the nurse call handset used by the user. The response priority 410d stores a priority indicating an index of which call the staff should respond to when receiving a call from the user. In this embodiment, the priority is expressed by an integer value from 1 to 5, and the higher the priority value, the higher the priority is. The following care level 410e, vital information 410f, independence level 410g, excretion timing 410h, and injury / illness 410i store the care record information of the user. The care level 410e stores an index of the level of care required physically and mentally for the user (for example, support level 1 or 2, care level 1 to 5, etc.). The vital information 410f stores the user's health measurement information (e.g., body temperature, blood pressure, pulse oximeter measurement values) in a specified format. The independence level 410g stores a classification value that indicates the state of the user when living daily life alone (e.g., classification into full assistance, partial assistance, supervision, independence, etc.). The excretion timing 410h stores the time set aside for the user to excrete. The injury / illness status 410i stores a flag indicating whether the user is injured or ill.

[0037] The call history 420 is a table that stores a history of nurse call calls, and as shown in FIG. 5, has fields for a call ID 420a, a calling extension number 420b, a call time 420c, a call time 420d, and a call end time 420e.

[0038] The call ID 420a stores an identifier that uniquely identifies a call from the nurse call handset 10. The calling extension number 420b stores the extension number of the nurse call handset 10 that made the call. The call time 420c stores the time of the call from the nurse call handset 10 in the format of yyyymmddhhmmss. The call time 420d stores the time when the call from the nurse call handset 10 was received by the smartphone 30 and the call between the user and the staff member started in the format of yyyymmddhhmmss. The call end time 420e stores the time when the call between the user and the staff member ended in the format of yyyymmddhhmmss.

[0039] Next, the incoming call screen of a smartphone will be described with reference to FIG. When calls from multiple nurse call handsets 10 occur at the same time, the IP-PBX 100 transmits incoming call screen data and notifies all calls to the staff member's smartphone 30. The smartphone 30 has a call display screen 500 as shown in Fig. 6, which is made up of a call display unit 510 created for each call.

[0040] In the call display unit 510, a user name display 511, a response priority display 512, a call time display 513, and a response button 520 are displayed.

[0041] The user name display 511 displays the name of the user who has been called from the nurse call handset 10. The response priority display 512 displays the response priority calculated by the IP-PBX 100 for the called user. The call time display 513 displays the time from the time of the call to the present. The answer button 513 is a button that the staff member taps when answering a call from the user corresponding to that call display unit 510.

[0042] As a general rule, staff members respond to calls with higher priorities as indicated by the response priority display 512. To this end, the call display screen 500 of the smartphone 30 displays the call display units 510 sorted in order of response priority. When a new call occurs while a call is being displayed, the call display screen 500 is updated, a call display unit 510 corresponding to the new call is created, and the call display units 510 are re-sorted to display the call display screen 500.

[0043] At this time, if this principle is followed, calls with low response priority may have to be kept on hold for a long time, so it is desirable to display the time from when the call was made to the present as the call time display 513, and to notify staff after a certain time has elapsed by, for example, flashing the call display.

[0044] A call from the nurse call handset 10 is notified to the smartphone 30 to which the extension number of the incoming call group is assigned, and the call display screen 500 is displayed. At this time, when a staff member answers the call and talks, a call screen (not shown) is displayed on the smartphone 30 of that staff member, the call display screen 500 of the smartphones 30 of the other staff members is updated, the call display unit 510 corresponding to the answered call is deleted, and the call display screen 500 corresponding to the unanswered call remains.

[0045] Next, the call control process of the IP-PBX will be described with reference to FIGS. 7A and 7B. In the incoming call processing, the IP-PBX 100 first determines whether or not the incoming call is a new call (S100). When a new call is received (S100: YES), the call is registered in an incoming call queue (S101). The incoming call queue is a data structure that stores incoming calls as calls waiting to be answered.

[0046] Next, it is checked whether the extension of the target extension number in the incoming call group is busy (S102), and for busy incoming calls (S103: YES), a wait is made (S106), and if there is an incoming call that is not busy (S103: NO), the incoming calls in the incoming call queue are checked (S104), and an instruction to receive the call is given to the smartphone 30 of the extension number in the incoming call group that is not busy, together with the incoming call screen data shown in FIG. 6 including the response priority (S105).

[0047] Furthermore, the IP-PBX 100 determines whether or not the call is to be disconnected when answering / disconnecting an incoming call (S200).

[0048] If the call is not disconnected (if the call is answered) (S200: NO), the answered incoming call is deleted from the incoming call queue (S201).

[0049] Next, the other incoming calls in the incoming call queue are checked (S202), and if there are other incoming calls (S203: YES), the incoming call processing shown in FIG. 7A is performed for the other incoming calls (S204).

[0050] Next, an example of the contents of the incoming call queue when the IP-PBX controls calls, the display on the smartphone for the staff, and the staff's response will be described with reference to Figs. 8A to 8C.

[0051] As shown in FIG. 8A, assuming that nurse calls are made from user A, user B, and user C in that order over a certain period of time, the incoming call group for user A, user B, and user C includes extensions (1) to (3), and these extensions are assumed to be not busy.

[0052] At this time, the IP-PBX notifies the smartphones 30 of extensions (1) to (3) of the incoming call by displaying the response priority. Since the staff member of the smartphone 30 of extension (1) has the highest response priority for user B, the staff member answers the call from user B, and the call from user B becomes busy.

[0053] Next, as shown in Fig. 8B, the incoming call from user B is deleted, and the smartphone 30 of extension (1) displays a screen showing a call in progress with user B, after which the call ends and is disconnected. The display screens of the smartphones 30 of extensions (2) and (3) are updated when the incoming call from user B is answered, and display the incoming calls from users A and C. Here, the staff member at the smartphone 30 of extension (2) answers the incoming call from user A, which has the highest response priority and is displayed.

[0054] 8C, the incoming call from user A is deleted, and the smartphone 30 of extension (2) displays a screen showing a call in progress with user A. The display screens of the smartphones 30 of extension (1) (the call with user B has already been disconnected) and extension (3) are updated when the incoming call from user A is answered, and display only the incoming call from user C.

[0055] Next, the response priority process performed by the IP-PBX will be described with reference to FIG. The care management server 200 periodically transmits the care record information to the IP-PBX 200, and when the values ​​are updated, the IP-PBX 200 stores the values ​​in the care record information (care level 410e, vital information 410f, independence level 410g, excretion timing 410h, and injury / illness presence 410i) in the user information table 410. The care management server 200 may periodically transmit the care record information to the IP-PBX 200, or may notify the IP-PBX 200 when the care record information is updated.

[0056] The IP-PBX 200 checks for updates to the nursing care record information (S300). Then, the IP-PBX 200 determines whether the care record information has been updated (S301), and if the care record information has been updated (S301: YES), acquires the care record information from the user information table 410 (S302).

[0057] Next, the IP-PBX 200 acquires call history information from the call history 420 (S303). Next, the IP-PBX 200 calculates the call frequency of each user from the call history information (S303). Next, the IP-PBX 200 calculates the pre-priority of each user from the care record information (S303). The pre-priority is calculated, for example, by the following (Equation 1). pre priority = Min ((a x care level + b x vital signs + c x independence + d x injury or illness + 1) rounded off), 4)) ... (Formula 1) Here, a, b, c, and d are weighting coefficients that are determined by which of the items is to be prioritized. Note that, according to (Equation 1), the pre priority level takes an integer value from 1 to 4.

[0058] Next, it is determined whether it is time for each user to excrete (S306). If it is time to excrete (S306: YES), the process proceeds to S310. If it is not time to excrete (S306: NO), the process proceeds to S307.

[0059] Next, if there is no excretion timing, it is determined whether pre-priority=1 (S307). If pre-priority=1 is not true (S307: NO), the process proceeds to S310. If pre-priority=1 is true (S306: YES), the process proceeds to S308.

[0060] Next, when pre priority=1, it is determined whether the call frequency calculated in S303 within a predetermined time period exceeds a predetermined threshold (for example, more than 3 times in the past 3 hours, more than 7 times in the past day, etc.) (S308), and when the call frequency calculated in S303 within the predetermined time period exceeds the predetermined threshold (S308: YES), the response priority is set to 1 (S309).

[0061] In the process of this embodiment, when the pre-priority determined by the nursing record information is less than a predetermined threshold (2 in the example of FIG. 9), the user is judged to be relatively healthy mentally and physically. In the process of S309, when the pre-priority is less than a predetermined threshold and the call frequency exceeds a predetermined threshold in a certain period of time, it is assumed that the user is calling frequently for reasons such as wanting to chat, despite being relatively healthy mentally and physically, and therefore the response priority is set low.

[0062] Next, when it is time to excrete, if pre-priority is not 1, and if the call frequency calculated in S303 within a predetermined time does not exceed a predetermined threshold, response priority is set to pre-priority + 1 (S310). In either case, the response priority is an integer value between 1 and 5.

[0063] Next, the IP-PBX 200 stores the calculated response priority of each user in the user information table 410 (S311).

[0064] Next, a series of steps from when a user makes a nurse call until a staff member responds will be described with reference to Figs. 10A to 10E.

[0065] First, as shown in FIG. 10A, users A, B, and C make calls at the same time, and incoming calls are displayed to the staff at extensions (1), (2), and (3).

[0066] Here, as shown in FIG. 10B, the staff member at extension (1) selects and answers the call from user B, which has the highest response priority.

[0067] As a result, as shown in FIG. 10C, the staff member at extension (1) is on the phone with user B, and the call display unit 510 for the call to user B is deleted from the smartphones 30 carried by the staff at extensions (2) and (3).

[0068] Next, as shown in FIG. 10D, the staff member at extension (2) selects and answers the call from user A, which currently has the highest response priority.

[0069] As a result, as shown in FIG. 10E, the staff member at extension (2) is on the phone with user A, and the call display unit 510 for the call to user B is deleted from the smartphone 30 carried by the person at extension (3).

[0070] As described above, according to the call control system of this embodiment, even if multiple nurse call calls occur at the same time, all of them are displayed on the smartphone of each staff member who needs to respond, along with the response priority, so that users who need urgent attention can be quickly responded to.

[0071] In addition, staff members are assigned specific users within a group of smartphones to which notifications are sent, and if they receive simultaneous calls from multiple users, they can give priority to the users they are assigned to.

[0072] The system automatically determines response priority based on nursing records and call frequency, enabling staff to select and respond to calls that should be prioritized without having to understand the urgency of the user. [Explanation of symbols]

[0073] 5...in-house telephone line, 7...LAN (Local Area Network), 10...nurse call handset, 20...wireless AP (Access Point) device, 30...smartphone, 100...IP-PBX, 110...call control unit, 120...care information receiving unit, 130...response priority calculation unit, 140...incoming call screen data processing unit, 200...care management server, 210...care DB (Data Base), 220...care information management unit, 230...care information transmission unit, 240...care information input unit

Claims

1. A call control system for responding to calls from users in a care facility or nursing care facility, comprising: The system includes a call handset for receiving calls from users, an IP-PBX (Internet Protocol-Private Branch eXchange), a mobile terminal carried by a staff member who provides care services or nursing care services, and a wireless AP (Access Point) device that calls the mobile terminal and communicates wirelessly; the call handset, the IP-PBX, and the wireless AP device are connected to each other; The IP-PBX includes: Holding care information or nursing care information for each of said users; Calculating a response priority for each user based on the care information or nursing care; When the mobile terminal is called by the call handset, The IP-PBX generates call display data including the response priority for each user, and transmits the call display data to the called mobile terminal; the mobile terminal displays an incoming call display screen including the response priority for each user; When a plurality of the call handsets call the mobile terminal at the same time for a certain period of time, until an answering instruction is given from the mobile terminal, an incoming call display corresponding to the calls of all the call handsets that have made the call, the incoming call display including a call display unit created for each of the calls, is displayed on the mobile terminal; A call control system comprising: a call control unit for selecting and answering a call on said call handset in units of said call display displayed as an incoming call.

2. 2. The call control system according to claim 1, wherein the call display corresponding to the call to the call handset is sorted in order of response priority from highest to lowest.

3. 2. A call control system according to claim 1, wherein calls from said call handset to said portable terminals are terminated at a plurality of portable terminals to which extensions of an incoming call group corresponding to the extension numbers of said call handset are assigned.

4. 4. The call control system according to claim 3, wherein when one of the portable terminals called from said call handset is instructed to answer, the incoming call screen of the other portable terminal is updated.

5. The IP-PBX generates call display data including a call time for each user, and transmits the call display data to the called mobile terminal; 2. The call control system according to claim 1, wherein said mobile terminal displays an incoming call display screen including the ring time for each user.

6. The IP-PBX further comprises: maintaining a call history of calls from said user; 2. The call control system according to claim 1, wherein the response priority is calculated by referring to the call history.

7. The call control system of claim 6, characterized in that the IP-PBX lowers the response priority for calls whose pre-priority calculated from care information or nursing information is less than a predetermined threshold and whose call frequency exceeds a predetermined threshold within a predetermined time.

8. A call control method for a call control system that responds to calls from users in a care facility or nursing care facility, comprising: The call control system includes: The system includes a call handset for receiving calls from users, an IP-PBX (Internet Protocol-Private Branch eXchange), a mobile terminal carried by a staff member who provides care services or nursing care services, and a wireless AP (Access Point) device that calls the mobile terminal and communicates wirelessly; the call handset, the IP-PBX, and the wireless AP device are connected to each other; the IP-PBX storing care information or nursing care information for each of the users; The IP-PBX calculates a response priority for each user from the care information or nursing care. When the mobile terminal is called from the call handset, the IP-PBX generates call display data including the response priority for each user, and transmits the call display data to the called mobile terminal; a step of displaying an incoming call display screen including the response priority for each user by the mobile terminal; A call from the call handset to a mobile terminal is received by a plurality of mobile terminals to which extensions of an incoming call group corresponding to the extension numbers of the respective call handsets are assigned; When a plurality of the call handsets call the mobile terminal at the same time for a certain period of time, until an answering instruction is given from the mobile terminal, an incoming call display corresponding to the calls of all the call handsets that have made the call, the incoming call display including a call display unit created for each of the calls, is displayed on the mobile terminal; A call control method comprising the steps of: selecting and answering a call on said call handset in units of said call display displayed as an incoming call.

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