JP2015122713A - Private exchange system, private exchange, control method of private exchange system and control method of private exchange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently execute an inter-group proxy response.SOLUTION: A private exchange system includes a plurality of extensions and a private exchange accommodating the plurality of extensions while dividing them into a plurality of response groups. The plurality of extensions include a plurality of group buttons provided for each of the plurality of response groups and added with display functions, respectively. The private exchange includes control means in which, when a call is incoming to a predetermined extension, on the basis of reception possibility states of all extensions within the response group to which the call incoming extension belongs, a call incoming delay time that is a time from call incoming until activating display of the response group button is determined and after the lapse of the call incoming delay time, the display of the response group button of the response group to which the call incoming extension belongs is made active.

Description

  The present invention relates to a private branch exchange system, a private branch exchange, a method for controlling a private branch exchange system, and a method for controlling a private branch exchange that execute a proxy response between groups.

  Some private branch exchange systems have an "inter-group proxy response" function in which an extension belonging to another proxy response group responds on behalf of an incoming call to an extension belonging to a proxy response (call pickup) group There is.

  Regarding inter-group proxy response, for example, Patent Document 1 describes a technique for notifying another extension of a group to which an extension in which an incoming call belongs belongs to another extension when the incoming call is generated for an extension. There is. Japanese Patent Application Laid-Open No. 2004-259542 discloses a technique for enabling a proxy response by turning a proxy response dial of another group response from an extension that does not belong to an extension that does not belong to the proxy response group when there is an incoming call to an extension within a proxy response group. There is a description about.

  On the other hand, as a related technique, Patent Document 3 provides a timer for measuring a non-response transfer time for each extension, and a timer value (that is, a non-response transfer time) set in this timer according to the usage situation for each extension. A technique for gradually optimizing the process is described. Japanese Patent Application Laid-Open No. H10-228561 describes a technique for enabling an incoming caller's extension to respond even after a non-response transfer.

JP-A-3-72759 (Page No. 3, FIG. 1) JP 62-118663 A (Page No. 3-5) JP 2011-119838 A (Page No. 3-5) JP 2011-0119182 A (page No. 3-5)

  Usually, the groups are arranged at positions where they cannot be directly visually recognized, for example, at separate floors or even on the same floor. In other words, the inter-group proxy response operation performed under such an arrangement is performed without considering the surrounding situation on the incoming call extension side.

  In this case, at the time of an incoming call, there is a possibility that a member of the other group will first make a proxy response even though the member of the group exists around the incoming call extension.

  That is, it is difficult to say that the convenience of a general inter-group proxy response as described above is sufficiently high. Further, the techniques described in Patent Documents 1 to 4 cannot solve the above problems.

  The present invention has been made to solve the above-described problems, and is capable of efficiently performing inter-group proxy response, private branch exchange, private branch exchange system control method, and private branch exchange control method The purpose is to provide.

  The private branch exchange system of the present invention is a private branch exchange system comprising a plurality of extensions and a private branch exchange that accommodates the plurality of extensions divided into a plurality of response groups, wherein the plurality of extensions are a plurality of the response groups. A plurality of response group buttons each provided with a display function, and when the private branch exchange receives an incoming call on a predetermined extension, the private branch exchange Based on the acceptance status of all the extensions, determining an incoming delay time that is a time from when the incoming call is received until the display of the response group button becomes active, and when the incoming delay time has passed, Control means for activating the display of the response group button of the response group to which the extension that received the call belongs.

  A first control method of the present invention is a control method of a private branch exchange system comprising a plurality of extensions and a private branch exchange that accommodates the plurality of extensions divided into a plurality of response groups, wherein the plurality of extensions are: Provided with a plurality of response group buttons provided for each of the plurality of response groups, each having a display function. In the private branch exchange, when there is an incoming call to a predetermined extension, the extension that has received the call belongs Based on the acceptance status of all the extensions in the response group, an incoming delay time that is a time from when the incoming call is received until the display of the response group button becomes active is determined, and the incoming delay time When the time elapses, the display of the response group button of the response group to which the extension that has received the call belongs is made active.

  The private branch exchange of the present invention is a private branch exchange that accommodates a plurality of extensions divided into a plurality of response groups, and the plurality of extensions are provided for each of the plurality of response groups and each has a display function. The private branch exchange, when an incoming call arrives at a predetermined extension, based on the acceptability status of all the extensions in the response group to which the extension that received the call belongs. An incoming delay time, which is a time from when there is an incoming call until the display of the response group button becomes active, is determined, and when the incoming call delay time elapses, Control means for activating the display of the response group button is provided.

  A second control method of the present invention is a control method for a private branch exchange that accommodates a plurality of extensions divided into a plurality of response groups, and the plurality of extensions are provided for each of the plurality of response groups. A plurality of response group buttons with a display function, and in the private branch exchange, when an incoming call is received on a predetermined extension, whether or not all the extensions in the response group to which the extension that has received the call belongs can be accepted Based on the state, an incoming call delay time that is a time from when the incoming call is received until the display of the response group button is activated is determined, and when the incoming call delay time elapses, the extension at which the incoming call is received The display of the response group button of the response group to which is included is activated.

  Inter-group proxy response is performed efficiently.

It is a block diagram which shows the structural example of the private branch exchange system which concerns on embodiment of this invention. It is a block diagram of the display operation part of the extension shown in FIG. It is a block diagram which shows the structural example of the private branch exchange shown in FIG. It is a block diagram which shows the structural example of the memory | storage part shown in FIG. It is a figure which shows the example of a memory content of an extension basic information storage part. It is a figure which shows the example of the memory content of a button information storage part. It is a figure which shows the example of a format of an incoming call delay time determination table. It is a figure which shows the example of the memory content of a proxy response state memory | storage part. In the private branch exchange system shown in FIG. 1, it is a figure which shows the example of a display of the display operation part of each extension until it is a proxy response after an incoming call is displayed on a group button. In the private branch exchange system shown in FIG. 1, it is a figure which shows the example of a display of the display operation part of each extension after a proxy response. It is a figure which shows the example of a state transition of the block in a proxy response state memory | storage part.

(Description of configuration)
FIG. 1 is a block diagram showing a configuration example of a private branch exchange system 10 according to an embodiment of the present invention. In the following description, an extension terminal (or extension telephone) is referred to as an “extension”.

  The private branch exchange system 10 includes a plurality of extensions 12 and a private branch exchange 14 that accommodates the plurality of extensions 12. The private branch exchange 14 is connected to another extension 18 via the trunk 16.

  The private branch exchange 14 registers the plurality of extensions 12 by appropriately grouping them into a plurality of response groups. In FIG. 1, in order to make the description clearer, two response groups (response group 1 and response group 2) are formed, and three extensions 12 are registered in each of the response groups. In this case, the extension number of each extension 12 of the response group 1 is set to 200 series (200, 201, 202), and the extension number of each extension 12 of the response group 2 is set to 300 series (300, 301, 302). Shall be. In FIG. 1, the extension number of another extension 18 is set to 400. In FIG. 1, the parentheses on the right side of reference numerals 12 and 18 indicate the respective extension numbers.

  Of course, the example shown in FIG. 1 is merely an example, and the number of response groups, the number of extensions that can be registered in each response group, and the extension number of each extension can be arbitrarily set.

  Each extension 12 includes a display operation unit 30. FIG. 2 is a configuration diagram of the display operation unit 30. The display operation unit 30 includes a display unit 32 and a button unit 34. The display unit 32 displays predetermined information (for example, character information). The button unit 34 includes a response group button 40 that is a button for each response group (in the case of the present embodiment, response group 1 and response group 2), a proxy button 42, and an extension number button 44 indicating its own state. Prepare. Each button of the button unit 34 has a display function (for example, a lamp that lights or blinks).

  In addition, the structure of the display operation part 30 is not limited to the structure of FIG. 2, It can be set as arbitrary structures. For example, when the number of response groups is different from that in FIG. 1 (ie, “2”), the number of response group buttons 40 on the display operation unit 30 is increased or decreased accordingly.

  In addition, the other extension 18 that is the extension number 400 does not necessarily include the display operation unit 30, but in the present embodiment, in order to make the description clearer, the display operation unit is similar to the extension 12. 30 is provided.

  Each of the extensions 12 sets “acceptability state”. For example, the extension 12 sets “acceptable” in the acceptability state when its own state is in a state where it can respond, and sets “not” as the acceptability state in a state where it is difficult to respond. The acceptance / rejection status is transmitted to the private branch exchange 14 in response to the will of the extension 12 or a request from the private branch exchange 14. The acceptance / rejection status is determined based on information indicating whether or not the call is busy, incoming call rejection information, a detection result of a human sensor built in the extension 12, and the like.

  FIG. 3 is a block diagram illustrating a configuration example of the private branch exchange 14. The private branch exchange 14 includes a control unit 50 and a storage unit 52.

  The control unit 50 collects the acceptability status of each extension 12 and stores the collection result in the extension basic information storage unit 60 of the storage unit 52. The control unit 50 is the time from the incoming call to the incoming call display on the response group button based on the acceptance / rejection status of all the extensions in the response group to which the predetermined extension belongs when the incoming call is received on the predetermined extension. Determine the incoming delay time. The control unit 50 displays the incoming call on the response group button of the group to which the predetermined extension belongs when the incoming call delay time elapses after the incoming call.

  FIG. 4 is a configuration diagram of the storage unit 52.

  The storage unit 52 includes an extension basic information storage unit 60, a button information storage unit 62, an incoming call delay time determination table 64, and a proxy response state storage unit 66.

  FIG. 5 is a diagram showing the contents stored in the extension basic information storage unit 60. The extension basic information storage unit 60 stores, for each extension 12, an extension number, a response group number, an acceptability status, and an incoming call delay timer.

  FIG. 6 is a diagram showing the contents stored in the button information storage unit 62. The button information storage unit 62 stores button data for each extension 12 (that is, information about the button unit 34 in FIG. 2).

  FIG. 7 is a diagram showing a format example of the incoming call delay time determination table 64. In the incoming delay time determination table 64, “incoming call extension acceptance / rejection status” which is the acceptance / rejection status of the incoming extension 12 is set as a parameter of one axis, and each of the other members (extensions) of the group to which the extension 12 belongs. The “group extension acceptability status”, which is uniquely determined based on the acceptability status, is composed of a matrix table in which the parameters of the other axis are set.

  FIG. 8 is a diagram showing the contents stored in the proxy response state storage unit 66. In the proxy response state storage unit 66, a predetermined work area is secured for each response group. Within each area, a block is generated each time proxy response control occurs. The block is released when the proxy response control ends (that is, becomes an empty block). Each block stores various information related to proxy responses (proxy response status, incoming call extension, elapsed time, caller information, proxy response extension).

  The control unit 50 acquires the latest acceptability status from each extension 12 periodically or when there is a change so that the acceptability status in the extension basic information storage unit 60 is always the latest status.

  When an incoming call is received at a predetermined extension 12, the control unit 50 reads from the extension basic information storage unit 60 the acceptance / rejection status of all the extensions of the group to which the received extension 12 belongs. The control unit 50 determines the “group extension acceptance / rejection status” from the read data. For example, when there is one or more extension lines that can be accepted, the group extension acceptance / rejection status may be “permitted”, and when there is no extension that can be accepted, “no” may be set. Of course, the rule for determining whether the group extension can be accepted is not limited to the above. For example, the determination rule may be a rule that sets the group extension acceptance / rejection status to “permitted” when the acceptable extension is “two or more”.

The incoming delay time determination table 64 generally selects a shorter incoming delay time when there is a person who can be accepted in the group, and longer when there is no person who can be accepted in the group. The incoming call delay time is set to be selected.
(Description of operation)
Hereinafter, the operation of the private branch exchange system 10 will be described mainly with reference to FIGS. 9 to 11 and with reference to other drawings as necessary.

  In the following description, the outgoing extension is an extension having an extension number of 400 (hereinafter referred to as “extension 400”), and the incoming call extension is an extension having an extension number of 200 (hereinafter referred to as “extension 200”). The proxy response extension will be described as an extension whose extension number is 300 (hereinafter referred to as “extension 300”). As described above, the extension 200 belongs to the response group 1, and the response group 1 includes the extension 201 and the extension 202 in addition to the extension 200. The extension 300 is assumed to belong to the response group 2.

  When there is an incoming call from the extension 400 to the extension 200, the control unit 50 reads the number of the response group to which the extension 200 belongs from the extension basic information storage unit 60. In this case, the response group number is “1”. The control unit 50 reads the acceptability status of the extension 200 from the extension basic information storage unit 60. In this case, the acceptability status is “No”.

  Further, the control unit 50 reads the acceptability status of extensions other than the extension 200 of the response group 1. In this case, as shown in FIG. 5, the acceptability status of the extension 201 is “No”, and the acceptability status of the extension 202 is “Yes”. Then, the control unit 50 determines the group extension acceptance / rejection state according to a predetermined determination rule. For example, it is assumed that the determination rule is a rule that sets the group extension acceptance / rejection status to “permitted” when there is one or more extensions that can be accepted. In this case, since there is one extension that can be accepted (that is, extension 202), the group extension acceptance / rejection status is “possible”.

  The control unit 50 finally determines the incoming call delay time (10 seconds) by searching the incoming call delay time determination table 64 according to the incoming call extension acceptability status (= no) and the group extension acceptability status (= allowable). To do. The control unit 50 sets the determined incoming delay time in the incoming delay timer of the extension 200 in the extension basic information storage unit 60, and starts countdown.

  Thereafter, when the value of the incoming delay timer becomes “0” (that is, when 10 seconds have elapsed), the control unit 50 hunts an empty block in the response group 1 area of the proxy response state storage unit 66. The control unit 50 sets the proxy response state of the hunted empty block to “group incoming” (see FIG. 11A), sets the extension 200 to the incoming extension of the empty block, and sets the initial value 0 seconds as the elapsed time. And extension 400 is set in the caller information.

  Further, when the value of the incoming delay timer of the extension 200 becomes “0”, the control unit 50 searches the button information storage unit 62 and finds all the extensions having buttons of the response group 1 (in this embodiment). , Extension 200, 201, 202, 300, 301, 302). The control unit 50 performs lamp control of the buttons of the response group 1 in the response group button 40 for all the specified extensions. For example, 10 seconds after receiving an incoming call to the extension line 200, the buttons of the response groups 1 of the extension lines 200, 201, 202, 300, 301, and 302 start blinking.

  A display example of the display operation unit 30 for each extension at this time is shown in FIG.

  A display example in the extension 400 which is a transmission extension is shown in FIG. In the extension 400, the extension number button 44 of the self is displayed (for example, green / lighted) indicating “calling”, and a ringing tone (ringback tone) sounds. Further, “200” indicating the extension 200 that is the destination is displayed on the display unit 32 of the extension 400.

  A display example in the extension line 200 which is an incoming call extension is shown in FIG. In the extension line 200, the own extension number button 44 and the response group 1 button display “Incoming” (for example, red / flashing), and a ring tone is ringing. Further, the display unit 32 of the extension line 200 displays “incoming call 400” indicating that a call from the extension line 400 is being received.

  A display example of the extension 300 that is an extension for performing a proxy response is shown in FIG. In the extension 300, as in the extension 200, the button of the response group 1 is displayed (for example, red / flashing) indicating “incoming call”.

  Thereafter, the elapsed time of the “group incoming” block in the proxy response state storage unit 66 is incremented every second by the control unit 50 during the “group incoming” period.

  When the flashing response group 1 button is pressed in the extension 300 belonging to the response group 2, the control unit 50 reads from the proxy response state storage unit 66 in the block whose proxy response state is “group incoming”. To find the block with the longest elapsed time. The control unit 50 writes “extension 300” in the proxy response extension of the block, and rewrites the proxy response status to “response is being reserved” (see FIG. 11B). The control unit 50 extracts the incoming extension and caller information from the block, and displays the information on the display unit 32 of the extension 300 “response is reserved” (see FIG. 9-b3). As a result, the operator of the extension 300 can grasp who is calling from whom before making a proxy response. If no proxy response is made, the group button is pressed again. In that case, the control unit 50 returns the state of the block from “Reserving response” to “Receiving group” (see FIGS. 11A and 11B).

  Note that the control unit 50 checks and updates the proxy response status storage unit 66 every time the extension status changes due to abandonment in the middle of an incoming call, proxy response operation, or the like, and when the “group incoming” block disappears, the group in the extension Stop the incoming call display of the button.

  Next, when an off-hook operation is performed by the operator at the extension 300, the control unit 50 rewrites the proxy response state of the memory block to “during proxy response” (see FIG. 11C) and at the elapsed time. Set “0” seconds. A display example of the extension 400 after the extension 300 has made a proxy response is shown in FIG. 9-c1, a display example of the extension 200 is shown in FIG. 9-c2, and a display example of the extension 300 is shown in FIG. 9-c3. .

  The control unit 50 causes the calling extension (extension 400) and the proxy response extension (extension 300) to be busy. Further, the control unit 50 “flashes” the proxy button 42 of the extension that has been subjected to the proxy response (extension 200), and displays information indicating that the proxy response has been made on the display unit 32. Thereby, the operator of the extension line 200 can know that the incoming call addressed to himself / herself has been proxy-answered by another person. The elapsed time of the proxy response state storage unit 66 is incremented every second by the control unit 50 during the “proxy response in progress” period.

  When the proxy button 42 that is blinking is pressed by an operator who wishes to return the call to the extension 200, the control unit 50 searches the proxy response state storage unit 66 for a block using the extension 200 as a key, Find the block with the shortest elapsed time from the searched blocks. The control unit 50 changes the proxy response state of the block having the shortest elapsed time to “return reservation in progress” (see FIG. 11E). The control unit 50 takes out the proxy response extension (extension 300) from the block and “flashes” the proxy button 42 of the extension 300. A display example of the extension 400 “return reserved” is shown in FIG. 10-e1, a display example of the extension 200 is shown in FIG. 10-e2, and a display example of the extension 300 is shown in FIG. 10-e3.

  The operator of the extension 300 knows that the operator of the extension 200, which is the incoming call extension, wants to return the proxy-answered call by flashing the proxy button 42. The operator of the extension 300 informs the other party of the call (operator of the extension 400) that the other party (operator of the extension 200) can answer the call, and presses the proxy button 42 blinking on the extension 300. Press. When the pressing of the proxy button 42 of the extension 300 is detected, the control unit 50 puts the extension 400 on hold, sets the extension 200 and the extension 300 to a busy state, and initializes the target block of the proxy response status storage unit 66 to the initial state. And release (see FIG. 11-f). A display example of the extension 400 in this case is shown in FIG. 10-f1, a display example of the extension 200 is shown in FIG. 10-f2, and a display example of the extension 300 is shown in FIG. 10-f3.

Thereafter, when the extension 300 is on-hooked, the control unit 50 places the extension 400 and the extension 200 into a two-party call state by a normal call processing function (see FIG. 11G). A display example of the extension 400 in this case is shown in FIG. 10-g1, a display example of the extension 200 is shown in FIG. 10-g2, and a display example of the extension 300 is shown in FIG. 10-g3.
(Explanation of effect)
In the embodiment described above, the incoming call display of the group button related to the response group to which the received extension belongs is executed with a delay corresponding to the status of the response group (attended status or call status). Therefore, even when the groups are arranged at positions where they cannot directly see each other, the members of the other group first make a proxy response even though the members of the group exist around the incoming call extension. Can be suppressed. That is, according to the present embodiment, an inter-group proxy response can be efficiently performed.

  By the way, when groups are placed in positions where they cannot directly see each other, after a proxy response, a call that has been proxy-replied is returned to the incoming extension even though there are members of the group around the incoming extension. There is a risk of problems that cannot be achieved.

  On the other hand, this embodiment has a means for the extension (operator) that has made a proxy response to return the call from the extension (operator) that has made the proxy response.

  Specifically, when an incoming call is proxy-received by an extension of another response group, the display of the proxy button of the extension that received the call becomes active (for example, blinking). When the proxy button of the extension that has received an incoming call is pressed, the display of the proxy button of the extension that responded by proxy is activated (for example, blinking). When the proxy button of the extension that has made a proxy response is pressed, the extension that received the call and the extension that made the proxy response are put into a call state. When the call state ends, the caller and the extension that received the incoming call are in a call state.

  This eliminates the troublesome work of the operator of the extension that made the proxy response, such as going out to the operator of the extension that received the proxy response after the call of the proxy response ended. That is, the inter-group proxy response can be performed more efficiently.

  In the embodiment described above, the storage unit 52 constituting the private branch exchange 14 is not an essential component. For example, the contents of the storage unit 52 may be stored in the control unit 50 itself, or may be stored in an external storage device.

1 and 2 Response group 10 Private branch exchange system 12 Extension 14 Private branch exchange 16 Trunk 18 Other extension 30 Display operation part 32 Display part 34 Button part 40 Response group button 42 Proxy button 44 Extension number button 50 Control part 52 Storage part 60 Extension basic Information storage unit 62 Button information storage unit 64 Arrival delay time determination table 66 Proxy response state storage unit

Claims (10)

A private branch exchange system comprising a plurality of extensions and a private branch exchange that accommodates the plurality of extensions divided into a plurality of response groups,
The plurality of extensions includes a plurality of response group buttons provided for each of the plurality of response groups and each having a display function,
When the private branch exchange receives an incoming call on a predetermined extension, the private branch exchange receives the incoming call after receiving the incoming call based on the acceptance / rejection status of all the extensions in the response group to which the extension that has received the incoming call belongs. An incoming call delay time which is a time until the display of the group button becomes active is determined, and when the incoming call delay time has elapsed, the display of the response group button of the response group to which the extension that received the incoming call belongs is displayed. A private branch exchange system comprising an active control means. The plurality of extensions have proxy buttons with display functions,
The control means activates display of the proxy button of the extension that has received the incoming call when the incoming call is proxy-answered by the extension of another response group, and the proxy of the extension that has received the incoming call Activate the display of the proxy button of the extension that responded by proxy when the button was pressed, and the extension and proxy response that received the incoming call when the proxy button of the extension that responded by proxy was pressed 2. The private branch exchange system according to claim 1, wherein said extension is placed in a call state, and a caller and said extension that has received said call are placed in a call state after said call state ends. A method of controlling a private branch exchange system comprising a plurality of extensions and a private branch exchange that accommodates the plurality of extensions divided into a plurality of response groups,
The plurality of extensions includes a plurality of response group buttons provided for each of the plurality of response groups and each having a display function,
In the private branch exchange, when an incoming call arrives at a predetermined extension, the response is made after the incoming call is received based on the acceptance / rejection status of all the extensions in the response group to which the extension that received the incoming call belongs. Determine the incoming delay time, which is the time until the group button display becomes active,
The control method of activating the display of the response group button of the response group to which the extension that received the call belongs when the incoming call delay time elapses. The plurality of extensions have proxy buttons with display functions,
In the private branch exchange, when the incoming call is proxy-answered by the extension of another response group, the display of the proxy button of the extension that received the incoming call is activated,
Activate the display of the proxy button of the extension that responded to the proxy when the proxy button of the extension that received the call was pressed,
When the proxy button of the extension that has responded to the proxy is pressed, the extension that received the incoming call and the extension that has responded to the proxy are in a call state,
The control method according to claim 3, wherein after the call state ends, the caller and the extension that received the incoming call are set to a call state. A private branch exchange that accommodates a plurality of extensions divided into a plurality of response groups,
The plurality of extensions includes a plurality of response group buttons provided for each of the plurality of response groups and each having a display function,
When the private branch exchange receives an incoming call on a predetermined extension, the private branch exchange receives the incoming call after receiving the incoming call based on the acceptance / rejection status of all the extensions in the response group to which the extension that has received the incoming call belongs. An incoming call delay time which is a time until the display of the group button becomes active is determined, and when the incoming call delay time has elapsed, the display of the response group button of the response group to which the extension that received the incoming call belongs is displayed. A private branch exchange comprising an active control means. The plurality of extensions have proxy buttons with display functions,
The control means activates display of the proxy button of the extension that has received the incoming call when the incoming call is proxy-answered by the extension of another response group, and the proxy of the extension that has received the incoming call Activate the display of the proxy button of the extension that responded by proxy when the button was pressed, and the extension and proxy response that received the incoming call when the proxy button of the extension that responded by proxy was pressed 6. The private branch exchange according to claim 5, wherein said extension is placed in a call state, and after said call state is terminated, a caller and said extension that has received said call are placed in a call state. A method for controlling a private branch exchange that accommodates a plurality of extensions divided into a plurality of response groups,
The plurality of extensions includes a plurality of response group buttons provided for each of the plurality of response groups and each having a display function,
In the private branch exchange, when an incoming call arrives at a predetermined extension, the response is made after the incoming call is received based on the acceptance / rejection status of all the extensions in the response group to which the extension that received the incoming call belongs. Determine the incoming delay time, which is the time until the group button display becomes active,
The control method of activating the display of the response group button of the response group to which the extension that received the call belongs when the incoming call delay time elapses. The plurality of extensions have proxy buttons with display functions,
In the private branch exchange, when the incoming call is proxy-answered by the extension of another response group, the display of the proxy button of the extension that received the incoming call is activated,
Activate the display of the proxy button of the extension that responded to the proxy when the proxy button of the extension that received the call was pressed,
When the proxy button of the extension that has responded to the proxy is pressed, the extension that received the incoming call and the extension that has responded to the proxy are in a call state,
The control method according to claim 7, wherein, after the call state ends, the caller and the extension that has received the call are placed in a call state. A private branch exchange system comprising a plurality of extensions and a private branch exchange that accommodates the plurality of extensions divided into a plurality of response groups,
The plurality of extensions have proxy buttons with display functions,
The private branch exchange activates display of the proxy button of the extension that has received the incoming call when the incoming call to the predetermined extension is proxy-answered by the extension of another response group, and the incoming call has been received When the proxy button of the extension is pressed, the display of the proxy button of the extension that has responded by proxy is activated, and the extension that has received the incoming call when the proxy button of the extension that has responded by proxy is pressed A private branch exchange system comprising: control means for placing the caller and the extension that has made a proxy response into a call state, and placing the caller and the extension that received the call in a call state after the call state ends. A method of controlling a private branch exchange system comprising a plurality of extensions and a private branch exchange that accommodates the plurality of extensions divided into a plurality of response groups,
The plurality of extensions have proxy buttons with display functions,
In the private branch exchange, when the incoming call to the predetermined extension is proxy-answered by the extension of another response group, the display of the proxy button of the extension that has received the call is activated,
Activate the display of the proxy button of the extension that responded to the proxy when the proxy button of the extension that received the call was pressed,
When the proxy button of the extension that has responded to the proxy is pressed, the extension that received the incoming call and the extension that has responded to the proxy are in a call state,
A control method, wherein the caller and the extension that received the incoming call are placed in a call state after the call state ends.

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