Incoming call control device, incoming call control method and program

Abstract

To provide an incoming call control apparatus which contributes to reduction of power consumption.SOLUTION: An incoming call control apparatus 2 includes an entry-exit information acquisition unit which acquires entry-exit information of a user from an entry-exit management system 1; an attendance monitoring sensor control unit which controls starting / stopping an attendance monitoring sensor on the basis of the entry-exit information of the user; an attendance determination unit which determines whether the user is present or not, on the basis of the presence / absence of the attendance information of the attendance monitoring sensor, and outputs a determination result; a base station information acquisition unit which acquires, from a private branch exchange 3, connection information indicating that wireless terminals Ap, Bp, Cp, Dp are connecting to one of base stations; and an incoming call control unit which controls, on the basis of the result determined by the attendance determination unit and the connection information of the base station, incoming call processing of the private branch exchange 3 for the wireless terminals.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an incoming call control device, an incoming call control method, and a program for an in-house telephone system. [Background technology]

[0002] In an example of an in-house telephone system, if an incoming call comes in to the telephone at the desk of an absent person, the ringer will continue to ring if no one answers the call, resulting in unnecessary power consumption. Patent Document 1 describes an absence call forwarding system that uses a sensor to monitor whether the person is present or absent, thereby eliminating the need to manually set the absence status on the private branch exchange or key telephone device. In this in-house telephone system, the presence or absence status is monitored by a sensor, and if an incoming call comes in to a telephone terminal when the person is absent, the call is forwarded to the telephone terminal in the nearest transmission / reception area within the transmission / reception area, or to any telephone terminal in a transmission / reception area where the person is present. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-258933 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned call forwarding system requires constant monitoring of changes in whether a person is present or absent, which poses the problem of wasting power because the monitoring circuitry is constantly operating.

[0005] The present invention has been made in consideration of the above-mentioned problems of the conventional technology, and has as its object to provide an incoming call control device, an incoming call control method, and a program that can contribute to reducing power consumption. [Means for solving the problem]

[0006] The incoming call control device of the present invention is an incoming call control device that is connected to an entrance / exit management system that outputs entry / exit information indicating the entry and exit of a user corresponding to a wireless terminal; an attendance monitoring sensor that outputs presence information indicating that the user is present at the seat corresponding to the user; and a private branch exchange that accommodates a base station corresponding to the seat corresponding to the user and a base station that does not correspond to the seat corresponding to the user, and controls incoming calls to the wireless terminal via the private branch exchange, and is characterized by having: an entrance / exit information acquisition unit that acquires the entry / exit information of the user from the entrance / exit management system; an attendance monitoring sensor control unit that controls the activation and deactivation of the attendance monitoring sensor based on the entry / exit information of the user; an attendance determination unit that determines whether the user is present based on the presence or absence of the presence information from the attendance monitoring sensor and outputs the determination result; a base station information acquisition unit that acquires connection information from the private branch exchange that indicates that the wireless terminal is connected to one of the base stations; and an incoming call control unit that controls the private branch exchange's processing of incoming calls to the wireless terminal based on the determination result of the presence determination unit and the connection information of the base station.

[0007] The incoming call control method of the present invention is an incoming call control method in an incoming call control device that is connected to an entrance / exit management system that outputs entrance / exit information indicating the entry and exit of a user corresponding to a wireless terminal, an attendance monitoring sensor that outputs presence information indicating that the user is present at the seat corresponding to the user, and a private branch exchange that accommodates a base station corresponding to the seat corresponding to the user and a base station that does not correspond to the seat corresponding to the user, and controls incoming calls to the wireless terminal via the private branch exchange, and is characterized by having the following steps: an entrance / exit information acquisition step that acquires the entry / exit information of the user from the entrance / exit management system; an attendance monitoring sensor control step that controls the activation and deactivation of the attendance monitoring sensor based on the entry / exit information of the user; an attendance determination step that determines whether the user is present based on the presence or absence of the presence information of the attendance monitoring sensor and outputs the determination result; a base station information acquisition step that acquires connection information from the private branch exchange that indicates that the wireless terminal is connected to one of the base stations; and an incoming call control step that controls the private branch exchange's processing of incoming calls to the wireless terminal based on the determination result of the presence determination step and the connection information of the base station.

[0008] The incoming call control program of the present invention is a program for causing a computer mounted on an incoming call control device to execute incoming call control, the incoming call control device being connected to an entrance / exit management system that outputs entrance / exit information indicating the entry and exit of a user corresponding to a wireless terminal, an attendance monitoring sensor that outputs presence information indicating that the user is present at the seat corresponding to the user, and a private branch exchange that accommodates a base station corresponding to the seat corresponding to the user and a base station that does not correspond to the seat corresponding to the user, and controlling incoming calls to the wireless terminal via the private branch exchange, and is characterized by executing an entrance / exit information acquisition step that acquires the user's entrance / exit information from the entrance / exit management system, an attendance monitoring sensor control step that controls the activation and deactivation of the attendance monitoring sensor based on the user's entrance / exit information, an attendance determination step that determines whether the user is present based on the presence or absence of the presence information from the attendance monitoring sensor and outputs the determination result, a base station information acquisition step that acquires connection information from the private branch exchange that indicates that the wireless terminal is connected to one of the base stations, and an incoming call control step that controls the private branch exchange's processing of incoming calls to the wireless terminal based on the determination result of the presence determination step and the connection information of the base station. [Effects of the Invention]

[0009] According to the incoming call control device, incoming call control method and program of the present invention, by linking with the entrance / exit management system, incoming calls can be forwarded to a person present rather than being directed to an absent person's seat, and if it is known in advance that the individual terminal user is absent, monitoring circuits etc. will not be activated, thereby contributing to reducing power consumption. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a system configuration diagram conceptually illustrating an in-house telephone system including an incoming call control device that is an example of an embodiment of the present invention. [Figure 2] 2 is a system configuration diagram conceptually showing one aspect of an in-house telephone system including the incoming call control device of FIG. 1. FIG. [Figure 3] 2 is a system configuration diagram conceptually showing another aspect of an in-house telephone system including the incoming call control device of FIG. 1. FIG. [Figure 4] 1. FIG. 4 is a system configuration diagram conceptually showing yet another aspect of the private telephone system including the incoming call control device of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an in-house telephone system including an incoming call control device according to an embodiment of the present invention will be described with reference to the drawings.

[0012] (Configuration explanation) FIG. 1 is a system configuration diagram conceptually showing an in-house telephone system 100 including an incoming call control device that is an example of an embodiment of the present invention.

[0013] The private branch telephone system 100 is composed of an entrance / exit control system 1 that manages the entry and exit of people, an incoming call control device 2, a private branch exchange (PBX) 3, wireless terminal base stations (also simply referred to as base stations) 4 and 5 accommodated in the private branch exchange, wireless terminals Ap, Bp, Cp, Dp connected to the base stations, and presence monitoring sensors 10, 11, 12, 13 connected to the incoming call control device 2. Note that the numbers of base stations, wireless terminals, and presence monitoring sensors shown in the figure are examples and are not limited to the numbers shown; a plurality of base stations and wireless terminals according to the specifications of the private branch exchange 3 can be accommodated, and presence monitoring sensors can be provided corresponding to the number of wireless terminals.

[0014] The entrance / exit control system 1, the private branch exchange 3, and the seat presence monitoring sensors 10, 11, 12, and 13 are connected to the incoming call control device 2 via Ethernet or the like so as to be able to communicate with each other.

[0015] [Entrance / Exit Management System] An entrance / exit management system 1 connected to the incoming call control device 2 outputs entrance / exit information indicating the entry and exit of users A, B, C, and D corresponding to wireless terminals Ap, Bp, Cp, and Dp to the incoming call control device 2. Here, entrance / exit management means managing the entry and exit of all people entering and leaving a building or facility such as a business office, preventing entry by unauthorized people, and managing who entered which part of the building or facility, and on what date and time. The entrance / exit management system 1 that manages these people is an electronic device person management system that uses electronic devices to centrally manage users. For example, if users A, B, C, and D are employees, it uses IC cards they carry, biometric authentication (face, fingerprint, etc.), or standardizes the entry of ID codes by employees.

[0016] [Private branch exchange system] The private branch exchange 3 is an electronic digital exchange that connects internal telephones to the public network NW and between internal telephones, and particularly includes an IP-PBX that has been converted to IP. Although not shown, the private branch exchange 3 generally includes a CPU that controls the entire device according to a software program, as well as internal circuits provided for each internal telephone, circuits that connect subscriber telephone lines and dedicated lines, senders that send dial pulses and push signals, switch circuits that connect speech paths, and other components, all packaged and housed in one or more racks.

[0017] Among the internal telephones, the wireless terminals Ap, Bp, Cp, and Dp are, for example, PHS (Personal Handy-phone System) terminals that can be used as office cordless telephones, and are connected to the private branch exchange 3 via private PHS base stations (base stations 4 and 5). PHS terminals that comply with private standards can be used as internal telephones. As shown in FIG. 1, the transmission / reception area 4E of base station 4 contains wireless terminals Ap and Bp, and the transmission / reception area 5E of base station 5 contains wireless terminals Cp and Dp.

[0018] The public network NW may be a mobile phone network (LTE (Long Term Evolution) or 4G (fourth generation mobile communication standard) or 5G (fifth generation mobile communication standard)), an IP (Internet Protocol) network, a public switched telephone network, or, for example, a public network such as a satellite communication network, or a dedicated network such as various WANs (Wide Area Networks) or VoPNs (Voice over Packet Networks).

[0019] [Incoming call control device] 1 is a computer device that has a CPU (Central Processing Unit), a storage device, an input section and an output section that are interfaces for inputting processing requests and information from maintenance personnel and returning processing results to the maintenance personnel, and a communication section, etc., all of which are connected to each other by an internal bus (not shown). Input information, etc. is acquired by the incoming call control device 2 via the input section and communication section.

[0020] The storage devices include, for example, RAM, HDD (Hard Disk Drive), SSD (Solid State Drive), and flash memory, which store various programs and data and also serve as a working area for the CPU. The input unit includes a keyboard, mouse, etc., which are used by maintenance personnel to input commands and data. The output unit includes a display, etc., which shows the status to maintenance personnel who input data. The communication unit communicates with the access control system 1 and the private branch exchange 3, sending and receiving data.

[0021] The overall operation of the incoming call control device 2 is controlled by a CPU that follows the program of operating system (OS) software installed in the storage device. The CPU executes incoming call control in accordance with various application software stored in the storage device, for example, application software for incoming call control.

[0022] The installed application software for call control is deployed to the storage device, which causes the CPU to operate as follows: (1) Entry and Exit Information Acquisition Unit PKP, (2) a seat occupancy monitoring sensor control unit FCT; (3) The presence determination unit FJP, (4) a base station information acquisition unit DCP; (5) Functions as a call reception control unit CCT.

[0023] The entrance / exit information acquisition unit PKP acquires from the entrance / exit management system 1 the entrance / exit information of users A, B, C, and D corresponding to the wireless terminals Ap, Bp, Cp, and Dp, respectively.

[0024] The presence monitoring sensor control unit FCT controls the activation (when entering) and deactivation (when leaving) of the presence monitoring sensors 10, 11, 12, and 13 based on the entrance and exit information of users A, B, C, and D of wireless terminals Ap, Bp, Cp, and Dp. This reduces power consumption. Each presence monitoring sensor is a human presence sensor, such as a camera or infrared sensor, placed at or near the seat of each user, and when it detects the presence or absence of a person, it sends a signal to the incoming call control device 2 indicating the person's presence or absence. The seat presence monitoring sensors 10, 11, 12, and 13 are arranged corresponding to the seats of users A, B, C, and D, and output seat presence information (for example, the information shown by ● in FIG. 1) indicating that users A, B, C, and D are present to the seat presence monitoring sensor control unit FCT, which then sends it to the seat presence determination unit FJP. In other words, the incoming call control device 2 is also a person presence monitoring device.

[0025] Specifically, presence monitoring sensor 10 detects whether user A of wireless terminal Ap is present or absent, presence monitoring sensor 11 detects whether user B of wireless terminal Bp is present or absent, presence monitoring sensor 12 detects whether user C of wireless terminal Cp is present or absent, and presence monitoring sensor 13 detects whether user D of wireless terminal Dp is present or absent.

[0026] The seat presence determination unit FJP determines whether users A, B, C, and D are present (absent) based on the presence or absence of seat presence information from the seat presence monitoring sensors 10, 11, 12, and 13, and outputs the determination result to the incoming call control unit CCT.

[0027] The base station information acquisition unit DCP acquires connection information for each wireless terminal from the private branch exchange 3, which indicates that wireless terminals Ap, Bp, Cp, and Dp are connected to base stations 4 and 5, and sends this information to the call termination control unit CCT. Here, the base station 4 corresponds to the seats that initially serve users A and B, and the base station 5 corresponds to the seats that initially do not serve users A and B. Similarly, the base station 5 corresponds to the seats that initially serve users C and D, and the base station 4 corresponds to the seats that initially do not serve users C and D. Each wireless terminal is connected to one of the base stations depending on its movement.

[0028] The incoming call control unit CCT controls the incoming call processing to the radio terminals Ap, Bp, Cp, and Dp via the private branch exchange 3 based on the determination result of the seat presence determination unit FJP and the connection information of the base stations 4 and 5 from the base station information acquisition unit DCP.

[0029] The incoming call control unit CCT is a table that the private branch exchange 3 refers to for incoming call processing based on the judgment result and connection information. (1) A user sensor terminal table that links the employee IDs of the employee IDs of the users A, B, C, and D of each wireless terminal with the sensor IDs of the corresponding presence monitoring sensors 10, 11, 12, and 13 and the terminal IDs of the corresponding wireless terminals Ap, Bp, Cp, and Dp; (2) an entry / exit table that manages the entry / exit status of the employee ID of each wireless terminal user; (3) a sensor table for managing the presence or absence status of each presence monitoring sensor; and (4) A base station table is provided to manage the connection status of each wireless terminal to the base station, and this is updated and managed according to changes.

[0030] When the incoming call control device 2 receives the employee ID of each wireless terminal user from the entrance / exit management system 1, it activates the corresponding presence monitoring sensor, which detects whether the user of each wireless terminal is present or absent, and also receives the connection status of the base station of each wireless terminal from the private branch exchange 3.Based on the presence / absence status of the presence monitoring sensor and the connection status of the base station of each wireless terminal, the private branch exchange 3 controls the incoming call processing to each wireless terminal.

[0031] [Example of operation of incoming call control device] First, let's assume that no one is in the building, and the incoming call control device 2 sets the users of wireless terminals Ap, Bp, Cp, and Dp to all absent. Let's assume that users A, B, and D of wireless terminals Ap, Bp, and Dp have entered the building. The entrance / exit management system 1 notifies the incoming call control device 2 that users A, B, and D of wireless terminals Ap, Bp, and Dp have entered the building, and sets the corresponding presence monitoring sensors 10, 11, and 13 to an operable state.

[0032] When the wireless terminal users A, B, and D corresponding to the operational seat presence monitoring sensors 10, 11, and 13 are seated at their own seats, the seat presence monitoring sensors 10, 11, and 13 are temporarily set to the seat presence state. The presence / absence determination of the presence monitoring sensor is as follows (1) to (6), and each state is notified to the incoming call control device 2. (1) If the connection of a user's wireless terminal does not change from the base station transmission / reception area where the user was initially located and the presence monitoring sensor detects that the user is present at the seat, the user is considered to be in the seated state. (2) If the connection of a user's wireless terminal remains in the base station transmission / reception area where it was originally located, and the presence monitoring sensor detects that the user is absent, the absence state is assumed. For example, as shown in Fig. 2, if the entrance / exit information indicates that user C has entered the building, the presence monitoring sensor control unit FCT activates the presence monitoring sensor 12 corresponding to user C's seat, and if the presence determination unit FJP determines that user C is not present (absence information indicated by a white circle), the incoming call control unit CCT does not cause the private branch exchange 3 to perform call control for the wireless terminal Cp corresponding to user C who is absent, even if there is connection information for the base station 5 corresponding to the seat corresponding to user C. (3) When the connection of a user's wireless terminal switches between base station transmission / reception areas and the presence monitoring sensor indicates an absence state, it is assumed that the user has moved to another location while carrying the wireless terminal, and since the wireless terminal can be accessed, it is determined that the user is present. (4) If the connection of a user's wireless terminal switches back to a base station other than the initial transmission / reception area and the presence monitoring sensor indicates that the user is seated, it is assumed that the user has returned to his / her own seat without the wireless terminal and is unable to answer the call, so the presence monitoring sensor control unit FCT will activate the presence monitoring sensor 12 corresponding to the seat of user C when the entrance / exit information indicates that user C has entered the building, and even if the presence determination unit FJP determines that user C is seated, the incoming call control unit CCT will not cause the private branch exchange 3 to perform call control for the wireless terminal Cp corresponding to the seated user C when there is no connection information for the base station 5 corresponding to the seat corresponding to user C (out of range). (5) If the connection of a user's wireless terminal switches to the base station transmission / reception area where the user was originally located and the presence monitoring sensor indicates that the user is present, the user is considered to have returned to his / her seat with the wireless terminal and is placed in the present state. (6) When the entrance / exit management system 1 outputs information indicating that a user has left the building, the presence monitoring sensor is deactivated and the absence status is entered. For example, as shown in Fig. 4, the presence monitoring sensor control unit FCT deactivates the presence monitoring sensor 12 corresponding to the seat of user C because the entrance / exit information indicates that user C has not entered the building, and the incoming call control unit CCT does not cause the private branch exchange 3 to perform call control for the wireless terminal Cp corresponding to user C.

[0033] As an example of call control, when user A receives an incoming call from the public network NW, the private branch exchange 3 inquires of the incoming call control device 2 whether user A corresponding to the presence monitoring sensor 10 is present or absent, and since the presence status is confirmed, the ringer is sounded on the wireless terminal Ap, and user A makes the call.

[0034] As another example of call control, when user C receives an incoming call from the public network NW, the private branch exchange 3 inquires of the incoming call control device 2 whether user C, corresponding to the presence monitoring sensor 12, is present or absent. Since user C is absent, it is known that user C will not be able to answer the call even if a call is made to user C, so a call is made to the wireless terminal Dp of user D, who is confirmed to be present and belongs to the transmission / reception area 5E of the same base station 5. This prevents the ringer of user C's wireless terminal Cp from ringing.

[0035] According to this embodiment, in an in-house telephone system, the entrance / exit management system 1 and the presence monitoring sensor that monitors presence or absence are linked, and the private branch exchange 3 knows in advance whether the person receiving the call is present or absent, thereby reducing calls to calls that cannot be answered and limiting calls to calls that can be answered.

[0036] Furthermore, according to this embodiment, by having the entrance / exit management system 1 grasp the absence status, it is possible to reduce the number of incoming calls to telephones that cannot be answered when it is known that the person is absent, and limit the number of incoming calls to telephones that can be answered without fail.

[0037] By linking the telephone system with the entrance / exit control system 1, the private branch exchange 3 can call the telephone terminal of another person present, without calling the telephone terminal of an absent person. [Explanation of symbols]

[0038] 2. Incoming call control device 3 Private branch exchange 4,5 base station 10, 11, 12, 13 Occupancy monitoring sensors 100 In-house telephone system Ap, Bp, Cp, Dp wireless terminal PKP entrance / exit information acquisition department FCT Seat occupancy monitoring sensor control unit FJP Presence Determination Department DCP base station information acquisition unit CCT incoming call control unit

Claims

1. An incoming call control device connected to an entrance / exit management system that outputs entrance / exit information indicating the entrance and exit of a user corresponding to a wireless terminal, an attendance monitoring sensor that outputs presence information indicating that the user is present at the seat corresponding to the user, and a private branch exchange that accommodates a base station corresponding to the seat corresponding to the user and a base station that does not correspond to the seat corresponding to the user, and that controls incoming calls to the wireless terminal via the private branch exchange, an entrance / exit information acquisition unit that acquires entrance / exit information of the user from the entrance / exit management system; an occupancy monitoring sensor control unit that controls activation and deactivation of the occupancy monitoring sensor based on the user entry / exit information; an occupancy determination unit that determines whether the user is present or not based on the presence or absence of the occupancy information from the occupancy monitoring sensor and outputs the determination result; a base station information acquisition unit that acquires connection information indicating that the wireless terminal is connected to any one of the base stations from the private branch exchange; an incoming call control unit that controls an incoming call process to the wireless terminal of the private branch exchange based on the determination result of the presence determination unit and the connection information of the base station; and said seat presence monitoring sensor control unit stops said seat presence monitoring sensor corresponding to the seat of said user who has not entered the building when said user's entrance / exit information indicates that said user has not entered the building, and said incoming call control unit does not cause call control to be performed on said wireless terminal corresponding to said user who has not entered the building; the presence monitoring sensor control unit activates the presence monitoring sensor corresponding to the user's seat when the user's entrance / exit information indicates that the user has entered the building, and the incoming call control unit, when the user is not present in the seat as a result of the determination by the presence determination unit, does not cause call control to be performed on the wireless terminal corresponding to the user who is not present in the seat even if there is connection information of the base station corresponding to the seat corresponding to the user; the presence monitoring sensor control unit activates the presence monitoring sensor corresponding to the user's seat when the user's entrance / exit information indicates that the user has entered the building, and the incoming call control unit, when the presence determining unit determines that the user is present at the seat and there is no connection information for the base station corresponding to the seat corresponding to the user, does not cause call control to be performed on the wireless terminal corresponding to the present user; and The incoming call control device is characterized in that, when the incoming call control unit does not perform call control for the wireless terminal corresponding to any of the users, but there is a wireless terminal corresponding to another user whose presence status has been confirmed as connection information belonging to the same transmission / reception area of ​​the base station corresponding to the seat corresponding to the user, the incoming call control unit performs call control for the wireless terminal corresponding to the other user.

2. An incoming call control method in an incoming call control device that is connected to an entrance / exit management system that outputs entrance / exit information indicating the entrance and exit of a user corresponding to a wireless terminal, an attendance monitoring sensor that outputs presence information indicating that the user is present at the seat corresponding to the user, and a private branch exchange that accommodates a base station corresponding to the seat corresponding to the user and a base station that does not correspond to the seat corresponding to the user, and that controls incoming calls to the wireless terminal via the private branch exchange, an entrance / exit information acquisition step of acquiring entrance / exit information of the user from the entrance / exit management system; an occupancy monitoring sensor control step for controlling activation and deactivation of the occupancy monitoring sensor based on the entrance and exit information of the user; an occupancy determination step of determining whether the user is present or not based on the presence or absence of the occupancy information from the occupancy monitoring sensor and outputting a determination result; a base station information acquisition step of acquiring connection information indicating that the wireless terminal is connected to any one of the base stations from the private branch exchange; an incoming call control step of controlling an incoming call process to the wireless terminal of the private branch exchange based on the determination result of the presence determination step and the connection information of the base station; and the seat presence monitoring sensor control step stops the seat presence monitoring sensor corresponding to the seat of the user who has not entered the building when the user's entrance / exit information indicates that the user has not entered the building, and the incoming call control step does not cause call control to be performed on the wireless terminal corresponding to the user who has not entered the building; the presence monitoring sensor control step activates the presence monitoring sensor corresponding to the user's seat when the user's entrance / exit information indicates that the user has entered the building, and the incoming call control step does not cause call control to be performed on the wireless terminal corresponding to the user who is not present at the seat when the determination result of the presence determining step indicates that the user is not present at the seat even if there is connection information of the base station corresponding to the seat corresponding to the user; The seat presence monitoring sensor control step activates the seat presence monitoring sensor corresponding to the seat of the user when the user's entrance / exit information indicates that the user has entered the building, and the incoming call control step, when the determination result of the seat presence determination step indicates that the user is present, does not cause call control to be performed on the wireless terminal corresponding to the present user when there is no connection information of the base station corresponding to the seat corresponding to the user; and The incoming call control method is characterized in that the incoming call control step is performed by not performing call control on the wireless terminal corresponding to any of the users, but if there is a wireless terminal corresponding to another user whose presence status has been confirmed and who belongs to the same transmission / reception area of ​​the base station corresponding to the seat corresponding to the user, performing call control on the wireless terminal corresponding to the other user.

3. a computer mounted on an incoming call control device connected to an entrance / exit management system that outputs entrance / exit information indicating the entrance / exit of a user corresponding to a wireless terminal, an occupancy monitoring sensor that outputs presence information indicating that the user is present at the seat corresponding to the user, and a private branch exchange that accommodates a base station corresponding to the seat corresponding to the user and a base station that does not correspond to the seat, and that controls incoming calls to the wireless terminal via the private branch exchange; an entrance / exit information acquisition step of acquiring entrance / exit information of the user from the entrance / exit management system; an occupancy monitoring sensor control step for controlling activation and deactivation of the occupancy monitoring sensor based on the entrance and exit information of the user; an occupancy determination step of determining whether the user is present or not based on the presence or absence of the occupancy information from the occupancy monitoring sensor and outputting a determination result; a base station information acquisition step of acquiring connection information indicating that the wireless terminal is connected to any one of the base stations from the private branch exchange; an incoming call control step of controlling an incoming call process to the wireless terminal of the private branch exchange based on the determination result of the presence determination step and the connection information of the base station; A program for executing the seat presence monitoring sensor control step stops the seat presence monitoring sensor corresponding to the seat of the user who has not entered the building when the user's entrance / exit information indicates that the user has not entered the building, and the incoming call control step does not cause call control to be performed on the wireless terminal corresponding to the user who has not entered the building; the presence monitoring sensor control step activates the presence monitoring sensor corresponding to the user's seat when the user's entrance / exit information indicates that the user has entered the building, and the incoming call control step does not cause call control to be performed on the wireless terminal corresponding to the user who is not present at the seat when the determination result of the presence determining step indicates that the user is not present at the seat even if there is connection information of the base station corresponding to the seat corresponding to the user; The seat presence monitoring sensor control step activates the seat presence monitoring sensor corresponding to the seat of the user when the user's entrance / exit information indicates that the user has entered the building, and the incoming call control step, when the determination result of the seat presence determination step indicates that the user is present, does not cause call control to be performed on the wireless terminal corresponding to the present user when there is no connection information of the base station corresponding to the seat corresponding to the user; and The program is characterized in that the incoming call control step does not cause call control to be performed on the wireless terminal corresponding to any of the users, but if there is a wireless terminal corresponding to another user whose presence status has been confirmed and who belongs to the same transmission / reception area of ​​the base station corresponding to the seat corresponding to the user, causes call control to be performed on the wireless terminal corresponding to the other user.

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