JP5621646B2 - Communication system, proxy response method - Google Patents

Description

  The present invention relates to a technique in which a communication terminal makes a proxy response to an incoming call to another communication terminal.

  Conventionally, for example, when communication terminals such as a plurality of telephones are arranged in the same group in a company, it is possible to make a proxy response to an incoming call to a certain communication terminal in the group by another communication terminal. . In addition, in order to improve the convenience of this proxy response, the operation status of other communication terminals (out of service area, standby, outgoing, calling, There is known a technique for notifying a state such as during communication. For example, if the user can confirm the operation state and the transmission source of other communication terminals on the display screen of the communication terminal, it is easy to determine whether or not to make a proxy response.

  As an example of a technique for notifying the operation state of another communication terminal, based on information from the presence server, the display of identification information of the communication terminal corresponding to the received destination number is displayed on the display screen of the proxy response terminal. A display that is changed to a display indicating that a call is being received is known. This proxy response terminal selects the displayed identification information of any communication terminal in response to a user operation, and responds instead of the selected communication terminal.

  As an example of another technique for notifying the operation state of another communication terminal, a means for requesting information related to a call in a call state to the call control device in the proxy response terminal and notified from the call control device A device having means for issuing a connection request specifying a call for proxy response based on information is known. The information notified from the call control device to the proxy response terminal includes information such as caller information, callee information, and the like regarding the call being called.

  In a relatively large-scale system, a plurality of call control devices such as SIP (Session Initiation Protocol) servers are provided, and the telephone number of each communication terminal is placed under the management of one of the call control devices. In such a system, it is preferable that a certain communication device (communication terminal) can make a proxy response to an incoming call to a telephone number placed under the control of a call control device different from the own device. The first reason is that, for example, the telephone numbers of the communication terminals of all users in the group in the company are not always under the control of the same call control device (station). Secondly, the group division by the user can be reviewed in a short period of time, but each time it is complicated to switch the call control device to which the telephone number of the communication terminal used by the user belongs.

  The following technologies are known for enabling a certain communication device (communication terminal) to make a proxy response to an incoming call to a telephone number that is under the control of a call control device different from its own device. . That is, for example, when there are two call control systems A and B, when a pickup (proxy response) is requested from a proxy response terminal in the system A, if there is an incoming call to the system A, the pickup control is performed. A system is known in which a call is made to system B via an inter-system gateway device that interworks A and system B.

JP 2010-34975 A JP 2007-174003 A JP 2007-243727 A

  Although an example of a technique related to enabling a proxy response to an incoming call to identification information (for example, a telephone number) placed under the management of a call control apparatus different from the own apparatus, according to this technique, In response to a pickup request from a proxy response terminal in one system, a call that is ringing to another system is searched. Therefore, in this exemplary technique, as the number of call control devices in the system, that is, the number of users increases, the call control device searches for the call being ringed in turn for each call control device, and the proxy response terminal performs proxy response. It will take a considerable amount of time to do so.

  Therefore, in one aspect of the invention, when the identification information of the communication terminal is placed under the management of any of a plurality of call control devices, the communication terminal manages the call control device different from the identification information of the own device. It is an object of the present invention to provide a call control device and a proxy response method capable of performing a proxy response in a shorter time to an incoming call to a communication terminal having identification information placed underneath.

In a first aspect, there is provided a call control device that manages communication information between communication terminals by managing communication terminal identification information and can communicate with other call control devices.
This call control device
First information in which identification information of each communication terminal is associated with one of the call control devices that manage the identification information among a plurality of call control devices connected to the communication network including the device itself. A storage unit for storing;
A proxy response request including identification information of the calling communication terminal is received from a communication terminal whose identification information is under the control of the own device, and the first communication information is referred to in response to the request, and the calling communication terminal A control unit that identifies another call control device that manages the identification information of
Second information indicating that a communication terminal whose identification information is managed by its own device makes a proxy response to an incoming call to the calling communication terminal is addressed to the other call control device specified by the control unit. Communication section to send;
Is provided.

In the second aspect, a communication terminal, a plurality of call control devices that manage identification information of the communication terminal and control calls between the communication terminals, and a state management server that manages the operation state of each communication terminal communicate with each other. In a communication system connected by a network, a proxy response method is provided in which a communication terminal makes a proxy response to an incoming call to another communication terminal.
This proxy response method is
Each of the plurality of call control devices stores in advance first information in which identification information and a call control device that manages the identification information are associated with each other for each communication terminal connected to the communication network;
The first communication terminal whose identification information is under the control of the first call control device notifies the state management server of the operation state of the own terminal when the operation state of the own terminal changes from waiting to calling. ;
The state management server stores the identification information of the first communication terminal and the operation state of the first communication terminal in association with each other in response to the notification from the first communication terminal;
The second communication terminal under the control of the second call control device whose identification information is different from that of the first call control device acquires the identification information of the first communication terminal in the operating state during the call from the state management server. ;
The second call control device receives a proxy response request including the identification information of the first communication terminal from the second communication terminal, refers to the first information in response to the request, and manages the identification information of the first communication terminal Identifying the first call control device as a call control device to perform;
The second call control device sends second information indicating that the communication terminal whose identification information is managed by its own device makes a proxy response to the incoming call to the first communication terminal to the identified first call control device. Sending;
including.

  According to the disclosed call control device and proxy response method, when the identification information of the communication terminal is placed under the management of any of a plurality of call control devices, the communication terminal is different from the identification information of its own device. A proxy response can be made in a shorter time for an incoming call to a communication terminal having identification information under the control of the control device.

The figure which shows the structure of the system of 1st Embodiment. The figure which shows notionally an example of the proxy response method in 1st Embodiment. The block diagram which shows the principal part of the structure of the communication terminal of 1st Embodiment. The figure which shows the contents of a status request list and a status notification list. The block diagram which shows the principal part of the structure of the SIP server of 1st Embodiment. The figure which shows the example of a telephone number analysis table. The block diagram which shows the principal part of the structure of the presence server of 1st Embodiment. The figure which shows the example of a presence server. The figure which shows the example of a registration terminal list. The flowchart which shows a process when the presence server of this embodiment receives a specific message from a communication terminal. The flowchart which shows a process when the presence server of this embodiment receives a specific message from a communication terminal. The flowchart which shows the operation | movement in the system of 1st Embodiment. The flowchart which shows the operation | movement in the system of 1st Embodiment. The flowchart which shows a part of operation | movement of the transmission terminal of 1st Embodiment. 6 is a flowchart showing a part of the operation of the receiving terminal according to the first embodiment. The flowchart which shows a part of operation | movement of the proxy response terminal of 1st Embodiment. The flowchart which shows operation | movement of the SIP server in which the telephone number of the receiving terminal is accommodated. The flowchart which shows operation | movement of the SIP server in which the telephone number of the receiving terminal is accommodated. The flowchart which shows operation | movement of the SIP server in which the telephone number of the proxy response terminal is accommodated. The flowchart which shows operation | movement of the SIP server in which the telephone number of the proxy response terminal is accommodated. The flowchart which shows the operation | movement in the system of 2nd Embodiment. The flowchart which shows the operation | movement in the system of 2nd Embodiment. The flowchart which shows a part of operation | movement of the proxy response terminal of 2nd Embodiment.

(1) First Embodiment Hereinafter, a first embodiment will be described.
In the description of each embodiment below, a telephone number is an example of identification information of a communication terminal. Although the identification information of a communication terminal is not specifically limited, IP address etc. can be applied to others.

(1) System Configuration FIG. 1 shows the system configuration of this embodiment. In the system of the present embodiment, a plurality of SIP servers (stations) 1, 2, 3, 4, 5,... And a plurality of communication terminals (hereinafter abbreviated as “terminals” as appropriate) A with respect to the communication network NW. , B, C, D,... And the presence server PS are connected. Each telephone number (hereinafter abbreviated as “telephone number” as appropriate) of a plurality of communication terminals is placed under the management of any of a plurality of SIP servers, and the SIP server controls calls between the communication terminals. . The presence server PS manages the operating states (states such as out of service area, waiting, calling, calling, communicating) of each communication terminal connected to the communication network NW. Each communication terminal can display the operation status of other communication terminals with reference to information communicated from the presence server PS. The connection form of each communication terminal to the communication network NW is not particularly limited, and is, for example, a wireless LAN (Local Area Network) or a wired LAN.
The SIP server is an example of a call control device, and the presence server is an example of a state management server.

(2) Proxy response in this embodiment In this embodiment, the communication terminal is placed under the management of a SIP server that is different from its own telephone number (that is, stored in a different SIP server). Assume that a proxy response is made to an incoming call to a communication terminal (hereinafter referred to as “inter-station pickup” as appropriate). FIG. 2 conceptually shows an example of the proxy response method in the present embodiment.

  In the example shown in FIG. 2, the telephone numbers of the communication terminals A and B are accommodated in the SIP server 5, and the telephone number of the communication terminal C is accommodated in the SIP server 1. At this time, the communication terminal C having a telephone number belonging to a different SIP server from the communication terminals A and B is acting as a proxy for a call sent from the communication terminal A to the communication terminal B (that is, an incoming call from the communication terminal B). Assume a response. The presence server stores and updates presence data in which the telephone number of the communication terminal is associated with the operation state of the communication terminal based on information notified from each communication terminal when the operation state changes. . In FIG. 2, “Subscribe” is a communication terminal registration message transmitted from the communication terminal to the presence server, and “Notify” notifies the changed information when the presence data changes between the presence server and the communication terminal. It is a message to do. As an example, as shown in the display screen (presence display screen) of the communication terminal C, each communication terminal displays the operating states of a plurality of communication terminals connected to the communication network. FIG. 2 shows an example in which “calling” is displayed corresponding to “Mr. A”, but each communication terminal or presence server associates “Mr. A” with a telephone number (for example, aaaa). It is assumed that

  In FIG. 2, when the user of the communication terminal A dials bbbb, which is the telephone number of the communication terminal B, the communication terminal B is ringing via the SIP server 5 and the operation state of the communication terminal B changes (waiting). (→ calling) is notified to the presence server. In response to this notification, when the presence data is updated in the presence server, the updated data is notified to the communication terminal C and displayed on the display screen of the communication terminal C (Mr. B-calling). . When the user of the communication terminal C who sees the display content selects “Mr. B” on the display screen, for example, the communication terminal C starts proxy response processing (pickup processing). That is, the communication terminal C has a special number indicating the pickup (pickup special number: “* 12” as an example in this embodiment) and data (* bbbb that is Mr. B's telephone number) that is being called (* 12-bbbb; included in the INVITE described later) is transmitted to the SIP server 1.

  The SIP server 1 analyzes the data (* 12-bbbb) received from the communication terminal C, so that it is a proxy response request by the communication terminal C, and the calling telephone number bbbb (communication terminal B) is SIP It recognizes that it is accommodated in the server 1. This recognition process will be described later. As a result, an INFO message (hereinafter, simply referred to as INFO as appropriate) is generated and transmitted to the SIP server 5 in order to make it possible to perform a proxy response of the communication terminal C in response to an incoming call to the communication terminal B. As a result, the SIP server 5 cancels the calling process of the communication terminal B. Thereafter, call control for proxy response is performed between the SIP server 1 and the SIP server 5.

(3) Configuration and Function of Each Device in System Hereinafter, the configuration and function of each device in the system of this embodiment will be described with reference to FIGS.

(3-1) Communication Terminal FIG. 3 is a block diagram showing the main part of the configuration of the communication terminal of this embodiment. As shown in FIG. 3, the communication terminal of this embodiment includes a CPU 10, a communication control unit 11, a presence processing unit 12, an operation input unit 13, a display unit 14, a voice input / output unit 15, and a data bus and a control bus. A bus 16 is included.
The CPU 10 is configured to be able to transmit and receive signals by each unit in the communication terminal and the bus 16 and performs overall control for realizing the function of the communication terminal.
Under the control of the CPU 10, the communication control unit 11 transmits / receives a message in accordance with the SIP (Session Initiation Protocol) via the communication network NW with the SIP server in which the telephone number of the terminal itself is accommodated. . Once a call is established, data transfer is performed between terminals in accordance with RTP (Real-time Transport Protocol), and voice signal processing in a call is performed by the voice input / output unit 15. The communication between the communication control unit 11 and the SIP server may be wireless or wired.

  The communication control unit 11 transmits and receives messages to and from the presence server via the communication network NW under the control of the CPU 10. For example, the communication control unit 11 transmits a registration message (Subscribe) of the own terminal, a notification message (Notify) about a change in the operation state of the own terminal, or a notification message (Notify) about a change in the operation state of another terminal. Receive processing. A communication protocol used for communication between the communication terminal and the presence server, as long as data transmission / reception about the operation state of another communication terminal connected to the communication network is possible between the communication terminal and the presence server. Does not matter. The communication form between the communication control unit 11 and the presence server may be wireless or wired.

  The presence processing unit 12 performs processing for analyzing a message received by the communication control unit 11 from the presence server, display processing according to the result of the message analysis, processing for generating a message addressed to the presence server, and the like. For example, the Subscribe to be transmitted to the presence server includes a status request list illustrated in FIG. The status request list is information specifying a list of telephone numbers whose operation status is to be acquired. In the example shown in FIG. 4A, three telephone numbers aaaa, bbbb, and dddd are specified. The Notify received from the presence server includes a status notification list illustrated in FIG. The status notification list is a list notified from the presence server in response to the Subscribe including the status request list. In FIG. 4B, the communication terminal having the telephone number aaaa is “calling”, the communication terminal having the telephone number bbbb is “calling”, and the communication terminal having the telephone number dddd is “out of service area”. An example to be notified is shown.

  Further, when detecting the change in the operation state of the own terminal, the presence processing unit 12 generates Notify including the telephone number of the own terminal and the operation state of the own terminal. This Notify is transmitted from the communication control unit 11 to the presence server.

  As a typical example, a list of telephone numbers for which an operation state is to be acquired included in a state request list transmitted from a communication terminal is typically one or more other users in the same group as the user of the communication terminal. Phone number. In other words, the list includes the telephone numbers of communication terminals of other users to which the user of the communication terminal may make a proxy response. For example, if the users of the communication terminal A (phone number aaaa), communication terminal B (phone number bbbb), communication terminal C (phone number cccc), and communication terminal D (phone number dddd) are in the same group, FIG. ) Is transmitted from the communication terminal C.

  The CPU 10 controls the display unit 14 to display on the display screen (presence display screen) by reconstructing the contents of the status notification list acquired by the presence processing unit 12. Thereby, the user of a communication terminal can visually recognize the operation state of another communication terminal. The operation input unit 13 cooperates with the CPU 10 to select one of the “calling” communication terminals from the state notification list displayed on the display screen (proxy response operation) or a predetermined value. Accept the dialing operation (proxy response operation) of the pickup special number.

  When the communication terminal “calling” is selected, the CPU 10 selects data including the pickup special number (in this embodiment, “* 12” as an example) and the telephone number being called (in the example shown in FIG. 2). * 12-bbbb) is assembled, and a message including the data is transmitted from the communication control unit 11 to the SIP server in which the telephone number of the terminal is accommodated.

(3-2) SIP Server FIG. 5 is a block diagram showing the main part of the configuration of the SIP server of this embodiment. As shown in FIG. 5, the SIP server of this embodiment includes a CPU 20, a communication control unit 21, a memory 22, an HDD (Hard Disk Drive) 23, and a bus 24 including a data bus and a control bus. . The HDD 23 stores data for backup.
The CPU 20 is configured to be able to transmit and receive signals via each part in the SIP server and the bus 24, and performs overall control for realizing the function of the SIP server. The CPU 20 is an example of a control unit.
Under the control of the CPU 20, the communication control unit 21 establishes a communication network NW with a communication terminal having a telephone number managed by its own server and with another SIP server connected to the communication network NW. Messages are transmitted and received in accordance with SIP. At this time, the CPU 20 interprets the call processing program in the memory 22 and executes call processing (session control processing) including control over the communication control unit 21. The communication control unit 21 is an example of a communication unit.

In addition to the above call processing program, the memory 22 stores station data including a telephone number analysis table and terminal data. The memory 22 is an example of a storage unit.
In the telephone number analysis table, the telephone numbers of all communication terminals connected to the communication network NW are associated with the SIP server in which each telephone number is accommodated. In the telephone number analysis table, the special number and the service of the special number are associated with each other. An example of the telephone number analysis table is shown in FIG. 6A and 6B show examples of telephone number analysis tables included in the SIP servers 1 and 5, respectively. In the example of the telephone number analysis table in the SIP server 1 in FIG. 6A, the telephone numbers aaaa and bbbb are accommodated in the SIP server 5, and the telephone numbers cccc and dddd are respectively accommodated in the local station (that is, in the local server). The communication terminals C and D are accommodated). In the example of the telephone number analysis table in the SIP server 5 in FIG. 6B, the telephone numbers cccc and dddd are accommodated in the SIP server 1, and the telephone numbers aaaa and bbbb are the communication terminals A and B accommodated in the own station, respectively. It is shown that. Also, * 12 indicates a pickup service, that is, a special number indicating a proxy response.
The telephone number analysis table is an example of first information.

  In the terminal data, the telephone number accommodated by the server is associated with unique identification information on the communication network NW. For example, when an IP network is used as the communication network NW, the communication control unit 21 refers to the terminal data and specifies the IP address of the transmission source and destination corresponding to the telephone number.

The function that the communication terminal of the telephone number belonging to the own server makes a proxy response to the incoming call to the communication terminal of the telephone number belonging to the other server (inter-office pickup function) is interpreted by the CPU 20 as a call processing program. It is realized by executing. In the inter-station pickup function, data including the pickup special number (in this embodiment, “* 12” as an example) and the telephone number being called from the communication terminal of the telephone number belonging to the own server (shown in FIG. 2). In this example, when * 12-bbbb) is received, the number included in the data is analyzed with reference to the telephone number analysis table in the memory 22. For example, in the example shown in FIG. 6A, when the SIP server 1 receives * 12-bbbb data from the communication terminal, it means that the data is a proxy response request for the telephone number bbbb. Search the phone number analysis table using as a key. As a result, since the SIP server 1 knows that bbbb is accommodated in the SIP server 5, the SIP server 1 generates an INFO message (INFO) and transmits it to the SIP server 5. INFO is transmitted when a certain SIP server makes a proxy response to another SIP server in response to an incoming call of a telephone number accommodated in another SIP server. The other server that has received the INFO performs a predetermined procedure for the proxy response, such as canceling the calling process for the telephone number indicated by the INFO.
The INFO message is an example of second information.

(3-3) Presence Server FIG. 7 is a block diagram showing the main part of the configuration of the presence server of this embodiment. As shown in FIG. 7, the presence server of this embodiment includes a CPU 40, a communication control unit 41, a memory 42, an HDD 43, and a bus 44 including a data bus and a control bus. The HDD 43 stores data for backup.
The CPU 40 is configured to be able to transmit and receive signals via each unit in the presence server and the bus 44, and performs overall control for realizing the function of the presence server.

  The communication control unit 41 transmits / receives messages to / from a plurality of communication terminals connected to the communication network NW via the communication network NW under the control of the CPU 40. For example, the communication control unit 41 receives a registration message (Subscribe) from each communication terminal, receives a notification message (Notify) about a change in the operation state of each communication terminal, or notifies a message about a change in the operation state of each communication terminal. (Notify) transmission processing is performed.

  The CPU 40 interprets and executes the presence service program in the memory 42 to provide a presence service function to each communication terminal connected to the communication network NW. The presence service function includes registration of each communication terminal, response to an operation state request of another communication terminal from each communication terminal, and the like. For example, the CPU 40 performs processing for analyzing a message received from the communication terminal 41, processing according to the result of the message analysis, processing for generating a message addressed to the communication terminal, and the like. For example, the Subscribe received by the communication control unit 41 includes the status request list illustrated in FIG. Further, Notify transmitted to the communication terminal includes the status notification list illustrated in FIG.

  In addition to the presence service program, the memory 42 stores presence data and a terminal registration list. Presence data is data in which the telephone number registered in the presence server is associated with the operation state of the communication terminal of the telephone number (out of service area, standby, outgoing, calling, communicating, etc.) One example is shown in FIG. The CPU 40 updates the contents of the presence data based on Notify transmitted each time the operation state changes from each communication terminal. Further, when receiving the status request list from the communication terminal, the CPU 40 refers to the presence data, acquires the operation status of the communication terminal specified in the status request list, and generates a status notification list addressed to the communication terminal.

  The registered terminal list is data in which the telephone number of the communication terminal that has transmitted the Subscriber is associated with the telephone number included in the status request list included in the Subscribe, and an example is shown in FIG. In the example shown in FIG. 9, for example, as described above, the user of communication terminal A (phone number aaaa), communication terminal B (phone number bbbb), communication terminal C (phone number cccc), communication terminal D (phone number dddd) Are assumed to be the same group. At this time, in the registered terminal list, the telephone number aaaa is associated with another telephone number (bbbb, cccc, dddd) in the same group.

Hereinafter, processing executed by the CPU 40 when a message is received from the communication terminal will be described with reference to FIGS. 10 and 11. FIG. 10 shows processing when a Subscribe is received from a communication terminal. FIG. 11 shows processing when Notify is received from the communication terminal.
In FIG. 10, when the CPU 40 of the presence server receives Subscribe from the communication terminal (Yes in Step S <b> 10), it updates the registered terminal list. That is, since the Subscribe includes a status request list (see FIG. 4A), the CPU 40 determines the telephone number of the communication terminal that transmitted the Subscribe and the telephone number specified in the list, Correspond in the registered terminal list. Next, the CPU 40 refers to the presence data and obtains an operation state corresponding to each telephone number in the registered terminal list in the received Subscribe. Then, the CPU 40 generates a state notification list (see FIG. 4B) including an operation state corresponding to the designated telephone number (step S13), and sends a Notify including this state notification list to Subscribe in step S10. It transmits to the transmitted communication terminal (step S14).

  In FIG. 11, when the CPU 40 of the presence server receives Notify from the communication terminal (Yes in step S20), the presence server updates the presence data. That is, since Notify includes the telephone number of the communication terminal that transmitted Notify in step S20 and the operating state of the communication terminal, the CPU 40 updates presence data based on these information (step S21). ). Thereafter, the CPU 40 controls the communication control unit 41 to return 200 OK, which is a message according to SIP, to the communication terminal (step S22). Next, the registered terminal list is referred to, for example, to notify the communication terminal of another telephone number in the same group as the telephone number of the communication terminal of the change in the operation state of the communication terminal that has transmitted Notify in step S20. Is done. For notification to the communication terminal of another telephone number, Notify including the updated status notification list is used (step S23).

(4) Operation in System and Operation of Each Device Hereinafter, with reference to FIGS. 12A to 17B, the operation at the time of inter-station pickup in the system of this embodiment and the operation at the time of inter-station pickup of each device will be described. .
12A and 12B are flowcharts showing the operation in the system of this embodiment. FIG. 13 is a flowchart showing a part of the operation of the calling terminal A. FIG. 14 is a flowchart showing a part of the operation of the receiving terminal B. FIG. 15 is a flowchart showing a part of the operation of the proxy response terminal (pickup terminal) C. 16A and 16B are flowcharts showing the operation of the SIP server 5 (SIP server accommodating the telephone number of the receiving terminal B) in the following description. 17A and 17B are flowcharts showing the operation of the SIP server 1 (SIP server in which the telephone number of the proxy response terminal C is accommodated) in the following description.
In the following description, it is assumed that the telephone numbers of the transmitting terminal A and the receiving terminal B are accommodated in the SIP server 5 and the telephone number of the proxy response terminal C is accommodated in the SIP server 1. In the following description, the receiving terminal B is an example of a first communication terminal, and the SIP server 5 is an example of a first call control device. The proxy response terminal C is an example of a second communication terminal, and the SIP server 1 is an example of a second call control device.

  In the following, the operation of each apparatus will be supplementarily added as appropriate while the entire operation will be described in chronological order with reference to the flow in FIGS. 12A and 12B. Moreover, in each figure, the message defined by SIP is described simply as follows.

・ 100 ... 100 Trying (Notify the reception completion and stop resending INVITE)
・ 180 ... 180 Ringing (calling)
・ 200 ... 200 OK (Indicates that the request was successful)
・ 4xx ... Request failure ・ 404 ... 404 Not Found (Indicates that the user cannot be found)
・ INVITE… Start session ・ CANCEL… Cancel ・ ACK… Confirm session establishment ・ BYE… End session

Step S100:
First, the terminals A, B, and C connected to the communication network transmit Subscribe including the status request list to the presence server. In the status request list, a list of telephone numbers for which each terminal wants to obtain the operating status is specified. Here, it is assumed that the users of terminals A, B, and C are in the same group. In this case, the terminal A designates the telephone number (bbbb) of the terminal B and the telephone number of the terminal C (cccc) as the telephone numbers for which the operation state is to be acquired. The terminal B designates the telephone number (aaaa) of the terminal A and the telephone number of the terminal C (cccc) as the telephone numbers for which the operation state is to be acquired. The terminal C designates the telephone number (aaaa) of the terminal A and the telephone number of the terminal B (bbbb) as the telephone numbers for which the operation state is to be acquired. The presence server that receives Subscribe from each terminal registers terminals A to C, that is, updates the registered terminal list (see FIG. 9), and returns 200 to each terminal.

Step S110:
Here, the user of the terminal A performs a dial operation of bbbb (the telephone number of the terminal B).

Step S120:
By the dial operation in step S110, the terminal A transmits INVITE specifying the telephone number bbbb to the SIP server 5, and the SIP server 5 returns 100 to the terminal A (steps S30 and S31 in FIG. 13, step S60 in FIG. 16A). , S61).

Step S130:
As a result of the process in step S120, the operating state of the terminal A has changed from “standby” to “during outgoing”, so the terminal A transmits Notify indicating the state change to the presence server (FIG. 13). Step S32). In the presence server, the presence data is updated based on the change in the operation state of the terminal A, and the change in the operation state of the terminal A is notified to the other terminals B and C. C is transmitted to C, and then 200 is received from terminals B and C. Thereby, the presence display screen in each terminal is updated.

Step S140:
When the SIP server 5 analyzes the telephone number included in the INVITE transmitted from the terminal A in step S120 and finds that the destination is the telephone number bbbb, the SIP server 5 transmits the INVITE to the terminal B having the telephone number bbbb ( Steps S62 and S63 in FIG. 16A). Terminal B receives this INVITE (step S40 in FIG. 14). In response to this INVITE, the terminal B transmits 100 and 180 (calling) to the SIP server 5 (steps S41 and S42 in FIG. 14). The SIP server 5 receives 100 and 180 from the terminal B (steps S64 and S65 in FIG. 16A). When receiving 180 from the terminal B, the SIP server 5 transmits 180 to the calling terminal A. Terminal A receives 180 (step S33 in FIG. 13). Thereby, a predetermined dial tone is output at the terminal A, and the user of the terminal A recognizes that the terminal A is “calling” (step S34 in FIG. 13). In this manner, a call is being made from the calling terminal A to the receiving terminal B (step S43 in FIG. 14 and step S66 in FIG. 16A).

  Although not shown in FIG. 12A, if the SIP server 5 receives 200 from the terminal A (step S67 in FIG. 16A), the terminal A and the terminal B are in communication (during a call) (Step S68 in FIG. 16A).

Step S150:
As a result of the process in step S140, the operation state of the terminal B has changed from “standby” to “calling”, so the terminal B transmits Notify indicating the state change to the presence server (FIG. 14). Step S44). In the presence server, the presence data is updated based on the change in the operation state of the terminal B and the change in the operation state of the terminal B is notified to the other terminals A and C. Transmit to C, and then receive 200 from terminals A and C. Thereby, the presence display screen in each terminal is updated.

Step S160:
A presence display screen is displayed on terminal C (step S50 in FIG. 15). Here, the user of the terminal C visually recognizes that the terminal B is “calling” on the presence display screen, and performs an operation of selecting the terminal B (YES in step S51 in FIG. 15). Pickup, that is, an operation of making a proxy response to an incoming call to terminal B is performed.

Step S170:
By the operation of step S160, the terminal C includes the telephone number data (* 12-bbbb) in which the pickup special number * 12 and the proxy response target telephone number (here, the bbbb of the terminal B) are sequentially assembled. INVITE is generated (step S52 in FIG. 15). Terminal C transmits the INVITE to SIP server 1 (step S53 in FIG. 15). The SIP server 1 receives the INVITE from the terminal C and returns 100 to the terminal C (steps S80 and S81 in FIG. 17A). Terminal C receives 100 from the SIP server 1 (step S54 in FIG. 15).
Note that the INVITE transmitted from the terminal C here is an example of a proxy response request.

Step S180:
As a result of the process in step S170, the operation state of the terminal C has changed from “standby” to “calling”, so the terminal C transmits Notify indicating the state change to the presence server (FIG. 15). Step S55). The presence server updates the presence data based on the change in the operation state of the terminal C, and notifies the other terminals A and B of the change in the operation state of the terminal C. B is transmitted to B, and then 200 is received from terminals A and B. Thereby, the presence display screen in each terminal is updated.

Step S190:
The SIP server 1 analyzes the telephone number data (* 12-bbbb) included in the INVITE received from the terminal C in step S170 with reference to the telephone number analysis table in the memory 22 (step S82 in FIG. 17A). . Specifically, if the leading code of the telephone number data (* 12-bbbb) included in the INVITE is not “* 12” (NO in step S83 in FIG. 17A), the SIP server 1 performs, for example, an intra-station call When the head code is “* 12” (YES in step S83 in FIG. 17A), the subsequent code is further analyzed (step S85 in FIG. 17A). That is, it is determined whether or not the telephone number indicated by the subsequent code (“bbbb” in this embodiment) is the telephone number accommodated by the own station (step S86 in FIG. 17A). That is, the SIP server 1 refers to the telephone number analysis table and identifies the SIP server in which the telephone number indicated by the subsequent code is accommodated. From the above analysis results, the SIP server 1 indicates that the telephone number data (* 12-bbbb) included in the INVITE received from the terminal C is an inter-station pickup request for the telephone number bbbb of the other station (SIP server 5). Recognize that there is.

  Although not shown in FIGS. 12A and 12B, if it is determined that the telephone number bbbb indicated by the subsequent code is a telephone number accommodated by the own station (step S87 in FIG. 17A), the SIP server 1 In-station pickup processing is performed. That is, the SIP server 1 transmits CANCEL to the terminal B having the telephone number bbbb accommodated therein, transmits 200 to the terminals A and C, and receives ACK from the terminals A and C. The terminals A and C are in communication (steps S87 to S90 in FIG. 17A).

Step S200:
The SIP server 1 generates an INFO message (INFO) based on the analysis result in step S190 (step S91 in FIG. 17B) and transmits it to the SIP server 5 in which the telephone number of bbbb is accommodated (in FIG. 17B). Step S92). The SIP server 5 receives INFO (step S69 in FIG. 16A). INFO includes data indicating a proxy response request (pickup, bbbb) for the telephone number of bbbb.

Step S210:
When the SIP server 5 receives INFO from the SIP server 1 and recognizes that the content of INFO is a proxy response request for the telephone number of bbbb (that is, the telephone number accommodated by itself) (YES in step S70 of FIG. 16B). ), CANCEL, which is a message for canceling the calling process of the communication terminal B, is transmitted to the terminal B (step S72 in FIG. 16B). Upon receiving CANCEL from the SIP server 5 (step S45 in FIG. 14), the terminal B transmits 200 to the SIP server 5 (step S46 in FIG. 14). When receiving 200 from the terminal B, the SIP server 5 transmits 200 to the SIP server 1 (step S73 in FIG. 16B). The SIP server 1 receives the signal from the SIP server 5 and recognizes that the received signal is 200 (YES in steps S93 and S94 in FIG. 17B).

  If the content of the INFO is not a telephone number accommodated by the own station (NO in step S70 in FIG. 16B), the SIP server 5 transmits 404 to the SIP server 1 (step S71 in FIG. 16B), and the terminal A To the state where the terminal B is being called (step S66 in FIG. 16A).

Step S220:
As a result of the process in step S210, the operation state of the terminal B has changed from “calling” to “standby”. Therefore, the terminal B transmits Notify indicating the state change to the presence server. In the presence server, the presence data is updated based on the change in the operation state of the terminal B and the change in the operation state of the terminal B is notified to the other terminals A and C. Transmit to C, and then receive 200 from terminals A and C. Thereby, the presence display screen in each terminal is updated.

Step S230:
Following the transmission of 200 in step S210, the SIP server 5 transmits INVITE to the SIP server 1, which is the INFO transmission source server (step S74 in FIG. 16B). The SIP server 1 receives the INVITE from the SIP server 5 (step S96 in FIG. 17B), and transmits 100 to the SIP server 5 in response to the INVITE reception. The SIP server 5 receives 100 from the SIP server 1 (step S75 in FIG. 16B).

Step S240:
The SIP server 1 transmits 200 for receiving the INVITE in step S230 to the SIP server 5 (step S97 in FIG. 17B) and transmits 200 for receiving the INVITE in step S170 to the proxy response terminal C. The SIP server 5 receives 200 from the SIP server 1 (step S76 in FIG. 16B), and the terminal C receives 200 from the SIP server 1 (step S56 in FIG. 15).
Further, when receiving 200 from the SIP server 1, the SIP server 5 transmits 200 for the reception of the INVITE in step S 120 to the calling terminal A. Terminal A receives 200 from the SIP server 5 (step S35 in FIG. 13).
The SIP server 5 and terminals A and C that have received 200 each transmit ACK to the 200 transmission sources (step S77 in FIG. 16B and step S98 in FIG. 17B).
A call is established between the calling terminal A and the proxy response terminal C through the processes of steps S230 and S240.

Step S250:
As a result of the processing in steps S230 and S240, the operation state of the terminal C has changed from “calling” to “communication”, so the terminal C transmits Notify indicating the state change to the presence server (see FIG. 15 step S57). The presence server updates the presence data based on the change in the operation state of the terminal C, and notifies the other terminals A and B of the change in the operation state of the terminal C. B is transmitted to B, and then 200 is received from terminals A and B. Thereby, the presence display screen in each terminal is updated.

Step S260:
As a result of the processing in steps S230 and S240, the operation state of the terminal A has changed from “calling” to “communication”, so the terminal A transmits Notify indicating the state change to the presence server (FIG. 13 step S36). In the presence server, the presence data is updated based on the change in the operation state of the terminal A, and the change in the operation state of the terminal A is notified to the other terminals B and C. C is transmitted to C, and then 200 is received from terminals B and C. Thereby, the presence display screen in each terminal is updated.

Step S270:
When a call is established between the calling terminal A and the proxy response terminal C, data communication based on RTP (Real-time Transport Protocol) is performed between the terminals A and C, and a so-called call is in progress (see FIG. 13 step S37, FIG. 15 step S58, FIG. 16B step S78, FIG. 17B step S99).

Step S280:
When the communication between the terminals A and C ends, the terminal A transmits BYE to the SIP server 5, the SIP server 5 transmits BYE to the SIP server 1, and the SIP server 1 transmits BYE to the terminal C. .

Step S290:
Since the operation state of the terminal C that has received BYE in step S280 has changed from “in communication” to “standby”, the terminal C transmits Notify indicating the state change to the presence server. The presence server updates the presence data based on the change in the operation state of the terminal C, and notifies the other terminals A and B of the change in the operation state of the terminal C. B is transmitted to B, and then 200 is received from terminals A and B. Thereby, the presence display screen in each terminal is updated.

Step S300:
In response to the BYE transmission in step S280, the reception source transmits 200 to the BYE transmission source.

Step S310:
Since the operation state of the terminal A that has received 200 in step S300 has changed from “communication” to “standby”, the terminal A transmits Notify indicating the state change to the presence server. In the presence server, the presence data is updated based on the change in the operation state of the terminal A, and the change in the operation state of the terminal A is notified to the other terminals B and C. C is transmitted to C, and then 200 is received from terminals B and C. Thereby, the presence display screen in each terminal is updated.

  The operation at the time of inter-station pickup in the system of the present embodiment and the operation at the time of inter-station pickup of each device have been described in detail. As described above, according to the proxy response method of this embodiment, in a system in which a plurality of SIP servers (stations) are connected to a communication network, each SIP server has a telephone number and a telephone number in the system. There is provided a telephone number analysis table in which the accommodated SIP server is associated. Then, when there is a request for inter-station pickup from the communication terminal of the telephone number accommodated in the local station, the SIP server refers to the telephone number analysis table and stores the telephone number that is being called. A server is specified, and a call relay process is performed with the specified SIP server. Therefore, it is not necessary to individually search for a plurality of other SIP servers for the telephone number that is the proxy response target, and the inter-station pickup process can be completed in a short time.

(2) Second Embodiment Hereinafter, a second embodiment will be described.
In the proxy response method according to the first embodiment, the proxy response terminal C registers the terminal in the presence server in advance, and the user of the terminal C performs the proxy response on the presence display screen displayed based on the presence data. The proxy response process is started when the predetermined operation is performed. On the other hand, in the proxy response method of the present embodiment, the proxy response terminal C does not register its own terminal in the presence server in advance, and the user of the terminal C performs a predetermined dial operation (proxy response operation) for proxy response. The proxy response process is started when this is performed. For example, it is assumed that the user of the terminal C performs a predetermined dial operation for a proxy response by perceiving the ringing operation of another calling terminal.

Hereinafter, with reference to FIGS. 18A to 19, an operation at the time of inter-station pickup in the system of the present embodiment and an operation at the time of inter-station pickup of each device will be described. 18A and 18B are flowcharts showing the operation in the system of the present embodiment. FIG. 19 is a flowchart showing a part of the operation of the proxy response terminal (pickup terminal) C.
As in the first embodiment, in the following description, the telephone numbers of the calling terminal A and the receiving terminal B are accommodated in the SIP server 5, and the telephone number of the proxy response terminal C is accommodated in the SIP server 1, and the terminal A , B, and C are assumed to be in the same group.

Step S400:
First, the terminals A and B transmit Subscribe including the registration request of the own terminal to the presence server. The presence server that receives the Subscribe from the terminals A and B registers the terminals A and B, that is, updates the registered terminal list (see FIG. 9), and returns 200 to each terminal.
In the flowcharts shown in FIGS. 18A and 18B, the presence server thereafter updates the operation state of the communication terminal in response to the notification from the registered communication terminal, but changes in the operation state of the specific communication terminal are not changed to other communication terminals. It is assumed that no notification is sent to the terminal.
18A and 18B shows a case where the proxy response terminal C registers with the presence server for the first time when the proxy response terminal C performs proxy response processing, and acquires the status notification list, but this is not restrictive. The terminal C may be registered in the presence server in advance, or the status notification list may be continuously acquired after the proxy response process.

Step S410:
Here, the user of the terminal A performs a dial operation of bbbb.

Step S420:
By the dial operation in step S410, the terminal A transmits INVITE specifying the telephone number bbbb to the SIP server 5, and the SIP server 5 returns 100 to the terminal A.

Step S430:
As a result of the processing in step S420, the operation state of the terminal A has changed from “standby” to “calling”, so the terminal A transmits Notify indicating the state change to the presence server. The presence server returns 200 to the terminal A in response to the reception of Notify.

Step S440:
When the SIP server 5 analyzes the telephone number included in the INVITE transmitted from the terminal A in step S420 and finds that the destination is the telephone number bbbb, the SIP server 5 transmits the INVITE to the terminal B having the telephone number bbbb. Terminal B receives this INVITE. In response to this INVITE, the terminal B transmits 100 to the SIP server 5. The SIP server 5 receives 100 from the terminal B.

Step S450:
As a result of the process in step S440, the operation state of terminal B has changed from “standby” to “calling”, so terminal B transmits Notify indicating the state change to the presence server. The presence server returns 200 to the terminal B in response to the reception of Notify.

Step S460:
When 180 is transmitted from the terminal B, the SIP server 5 transmits 180 to the calling terminal A. In this way, the calling terminal A is in a calling state to the receiving terminal B.

Step S470:
At this time, the user of the terminal C perceives the ringing operation of the receiving terminal B and performs a predetermined dial operation (here, “* 12” indicating a pickup special number). The dial operation, that is, the proxy response operation is recognized by the CPU 10 via the operation input unit 13 of the terminal B.

Step S480:
Recognizing a predetermined dial operation indicating a pickup special number, terminal C transmits a Subscribe including a status request list to the presence server (step S800 in FIG. 19). In the status request list, a list of telephone numbers whose operation status is to be acquired is specified. Here, since it is assumed that the users of the terminals A, B, and C are in the same group, the terminal C uses the telephone number (aaaa) of the terminal A and the terminal B ( bbbb) is specified. The presence server that receives the Subscribe from the terminal C registers the terminal C, that is, updates the registered terminal list (see FIG. 9), and returns 200 to the terminal C.
When the presence server receives the Subscribe, the presence server transmits Notify including the status notification list (see, for example, FIG. 4B) including the operation status of the terminals A and B specified in the status request list in the Subscribe to the terminal C. . Terminal C receives Notify including the status notification list from the presence server (step S801 in FIG. 19).
After receiving Notify from the presence server, the terminal C does not necessarily need to receive the status notification list thereafter, and therefore sends Unsubscribe, which is a message for stopping the list transmission, to the presence server. Receive.

Step S490:
In response to the dial operation in step S470, the terminal C selects the “calling” terminal (in this embodiment, the communication terminal having the telephone number bbbb) or its telephone number in the status notification list received from the presence server. It is specified (step S802 in FIG. 19). Further, the terminal C decides to perform a call pickup for the incoming call to the “calling” terminal, that is, to perform a proxy response to the incoming call to the terminal B.

Step S500:
The terminal C generates an INVITE including the telephone number data (* 12-bbbb) in which the pickup special number * 12 and the telephone number of the proxy response target (here, the bbbb of the terminal B) are sequentially assembled (see FIG. 19 step S803). Terminal C transmits the INVITE to SIP server 1 (step S804 in FIG. 19). The SIP server 1 receives the INVITE from the terminal C and returns 100 to the terminal C. Terminal C receives 100 from the SIP server 1 (step S805 in FIG. 19).

Step S510:
As a result of the process in step S500, the operating state of the terminal C has changed from “standby” to “during outgoing”, so the terminal C transmits Notify indicating the state change to the presence server (FIG. 19). Step S806). The presence server returns 200 to the terminal C in response to the reception of Notify.

Steps S590 to S710
The processing after step S590 in FIG. 18A and FIG. 18B is substantially the same as the processing after step S190 in FIG. 12A and FIG.

The SIP server 1 analyzes the telephone number data (* 12-bbbb) included in the INVITE received from the terminal C in step S500 with reference to the telephone number analysis table in the memory 22 (step S590). As a result, the SIP server 1 confirms that the telephone number data (* 12-bbbb) included in the INVITE received from the terminal C is an inter-station pickup request for the telephone number bbbb of the other station (SIP server 5). recognize.
The SIP server 1 generates an INFO message (INFO) based on the analysis result in step S590 and transmits it to the SIP server 5 in which the telephone number of bbbb is accommodated (step S600). INFO includes data indicating a proxy response request (pickup, bbbb) for the telephone number of bbbb.

  The SIP server 5 transmits CANCEL, which is a message for canceling the calling process of the communication terminal B, to the terminal B, and receives 200 from the terminal B. Further, when receiving 200 from the terminal B, the SIP server 5 transmits 200 to the SIP server 1 (step S610). As a result, since the operation state of the terminal B has changed from “calling” to “standby”, the terminal B transmits Notify indicating the state change to the presence server (step S620).

  Following the transmission of 200 in step S610, the SIP server 5 transmits INVITE to the SIP server 1, which is the INFO transmission source server, and receives 100 from the SIP server 1 (step S630).

  Next, the following step S640 is performed. That is, the SIP server 1 transmits 200 for receiving the INVITE in step S630 to the SIP server 5, and transmits 200 for receiving the INVITE in step S500 to the proxy response terminal C. The SIP server 5 receives 200 from the SIP server 1, and the terminal C receives 200 from the SIP server 1 (step S807 in FIG. 19). In addition, when receiving 200 from the SIP server 1, the SIP server 5 transmits 200 for receiving the INVITE in step S420 to the calling terminal A. The SIP server 5 and the terminals A and C that have received 200 transmit ACKs to the 200 transmission sources.

  A call is established between the calling terminal A and the proxy response terminal C through the processing of steps S630 and S640. As a result, since the operation state of the terminal C has changed from “calling” to “communication”, in step S650, the terminal C transmits Notify indicating the state change to the presence server (FIG. 19). Step S808). Similarly, since the operation state of the terminal A has changed from “calling” to “communication”, in step S660, the terminal A transmits Notify indicating the state change to the presence server.

  When a call is established between the calling terminal A and the proxy response terminal C, data communication based on RTP is performed between the terminals A and C in step S670, and a so-called call is in progress (step S809 in FIG. 19). . When the communication between the terminals A and C ends, as shown in step S680, the terminal A transmits BYE to the SIP server 5, the SIP server 5 transmits BYE to the SIP server 1, and the SIP server 1 Send BYE to C. Since the operation state of the terminal C that has received BYE in step S680 has changed from “communication” to “standby”, the terminal C transmits Notify indicating the state change to the presence server.

  In step S700, the BYE reception source in step S680 transmits 200 to the BYE transmission source. Since the operation state of the terminal A that has received 200 in step S700 has changed from “communication” to “standby”, in step S710, the terminal A transmits Notify indicating the state change to the presence server. To do.

  The operation at the time of inter-station pickup in the system of the present embodiment and the operation at the time of inter-station pickup of each device have been described in detail. As described above, according to the proxy response method of the present embodiment, as in the first embodiment, the SIP server receives a request for inter-station pickup from the communication terminal having the telephone number accommodated in the local station. The SIP server in which the telephone number being called is accommodated is identified with reference to the telephone number analysis table, and the call relay process is performed with the identified SIP server. Therefore, it is not necessary to individually search for a plurality of other SIP servers for the telephone number that is the proxy response target, and the inter-station pickup process can be completed in a short time.

  Although the embodiments of the present invention have been described in detail above, the call control device and proxy response method of the present invention are not limited to the above embodiments, and various improvements and modifications can be made without departing from the gist of the present invention. Of course, it may be.

For example, in each of the embodiments described above, the case where the telephone numbers of the calling terminal A and the receiving terminal B are accommodated in the same SIP server has been described, but the same applies to the case where both are accommodated in different SIP servers. The inter-station pickup function can be realized.
For example, in each of the above-described embodiments, if the telephone number of the receiving terminal B is accommodated in the SIP server 4, a proxy response can be made from the terminal C in which the telephone number is accommodated in the SIP server 1. Specifically, in step S140 of FIG. 12A, the SIP server 5 transmits INVITE to the SIP server 4 (not shown), and the SIP server 4 transmits INVITE to the terminal B. In step S200 of FIG. 12A, the SIP server 1 recognizes that the telephone number of the receiving terminal B is accommodated in the SIP server 4, and then transmits INFO to the SIP server 4 (not shown). .

  In each of the above-described embodiments, INVITE transmitted from the proxy response terminal to the SIP server and INFO transmitted / received between the SIP servers include data in which a pickup special number and a telephone number being called are assembled in series (embodiment) * 12-bbbb) is included in this example, but this data structure is only an example. If the receiving side can recognize the proxy response and the telephone number (identification information) of the proxy target in accordance with a specific protocol between the devices, the data configuration (data format) is not limited.

  Regarding the above embodiments, the following additional notes are disclosed.

(Appendix 1)
A call control device that manages communication terminal identification information and controls calls between communication terminals, and can communicate with other call control devices,
First information in which identification information of each communication terminal is associated with one of the call control devices that manage the identification information among a plurality of call control devices connected to the communication network including the device itself. A storage unit for storing;
A proxy response request including identification information of the calling communication terminal is received from the communication terminal whose identification information is under the control of the own apparatus, and the first communication information is referred to in response to the request, and the calling communication terminal A control unit that identifies other call control devices that manage the identification information of
Second information indicating that a communication terminal whose identification information is managed by its own device makes a proxy response to an incoming call to the calling communication terminal addressed to the other call control device specified by the control unit A communication unit that transmits
A call control device comprising:

(Appendix 2)
The second information includes a pickup special number indicating a proxy response and a telephone number as identification information of the first communication terminal.
The call control device according to attachment 1.

(Appendix 3)
A communication terminal, a plurality of call control devices that manage identification information of the communication terminals and control calls between the communication terminals, and a state management server that manages the operation state of each communication terminal are connected by a communication network. In a communication system, a communication terminal is a proxy response method in which a communication terminal performs a proxy response to an incoming call to another communication terminal,
Each of the plurality of call control devices stores in advance first information in which identification information is associated with a call control device that manages the identification information for each communication terminal connected to the communication network.
The first communication terminal whose identification information is under the control of the first call control device notifies the operation state of the own terminal to the state management server when the operation state of the own terminal changes from waiting to calling.
The state management server stores the identification information of the first communication terminal and the operation state of the first communication terminal in association with each other in response to the notification from the first communication terminal,
The second communication terminal under the control of the second call control device whose identification information is different from that of the first call control device acquires the identification information of the first communication terminal in the operating state during the call from the state management server,
The second call control device receives a proxy response request including the identification information of the first communication terminal from the second communication terminal, refers to the first information according to the request, and manages the identification information of the first communication terminal Identifying the first call control device as a call control device to perform,
The second call control device sends second information indicating that the communication terminal whose identification information is managed by its own device makes a proxy response to the incoming call to the first communication terminal to the identified first call control device. Send,
A proxy response method.

(Appendix 4)
The second communication terminal specifies the identification information of one or more communication terminals and notifies the state management server in advance,
The state management server stores the identification information of the second communication terminal and the identification information of the one or more communication terminals specified by the second communication terminal in association with each other,
The state management server notifies the second communication terminal of the change in the operation state each time the operation state of the one or more communication terminals designated by the second communication terminal changes.
The proxy response method according to attachment 3, further comprising:

(Appendix 5)
The second communication terminal specifies the identification information of one or more communication terminals and notifies the state management server in advance,
The state management server stores the identification information of the second communication terminal and the identification information of the one or more communication terminals specified by the second communication terminal in association with each other,
The second communication terminal requests the state management server to notify the operation state of each of the one or more communication terminals in response to a predetermined proxy response operation on the own terminal,
The second communication terminal specifies identification information of the communication terminal in the calling state in the operation state notified from the state management server.
The proxy response method according to attachment 3, further comprising:

(Appendix 6)
The second information includes a pickup special number indicating a proxy response and a telephone number as identification information of the first communication terminal.
The proxy response method according to any one of appendices 3 to 5.

(Communication terminal)
10 ... CPU
DESCRIPTION OF SYMBOLS 11 ... Communication control part 12 ... Presence processing part 13 ... Operation input part 14 ... Display part 15 ... Voice input / output part 16 ... Bus (SIP server)
20 ... CPU
21 ... Communication control unit 22 ... Memory 23 ... HDD
24 ... Bus (Presence server)
40 ... CPU
41: Communication control unit 42 ... Memory 43 ... HDD
44 ... Bus

Claims (4)

A communication terminal, a plurality of call control devices that manage identification information of the communication terminals to control calls between the communication terminals, and can communicate with other call control devices, and a state management server that manages the operation state of each communication terminal And a communication system connected by a communication network ,
Each of the plurality of call control unit, for each communication terminal connected to a communication network, and identification information, a storage unit for previously storing first information and the call control apparatus that manages the identification information is associated with Prepared ,
The first communication terminal whose identification information is under the control of the first call control device notifies the operation state of the own terminal to the state management server when the operation state of the own terminal changes from waiting to calling.
The state management server stores the identification information of the first communication terminal and the operation state of the first communication terminal in association with each other in response to the notification from the first communication terminal,
The second communication terminal under the control of the second call control device whose identification information is different from that of the first call control device acquires the identification information of the first communication terminal in the operating state during the call from the state management server,
The second call control device
The first control terminal receives a proxy response request including identification information of the first communication terminal from the second communication terminal, refers to the first information according to the request, and manages the identification information of the first communication terminal. Identify one call controller,
Transmitting to the identified first call control device second information indicating that the communication terminal whose identification information is under management of its own device makes a proxy response to an incoming call to the first communication terminal;
Communication system . A communication terminal, a plurality of call control devices that manage identification information of the communication terminals and control calls between the communication terminals, and a state management server that manages the operation state of each communication terminal are connected by a communication network. In a communication system, a communication terminal is a proxy response method in which a communication terminal performs a proxy response to an incoming call to another communication terminal,
Each of the plurality of call control devices stores in advance first information in which identification information is associated with a call control device that manages the identification information for each communication terminal connected to the communication network.
The first communication terminal whose identification information is under the control of the first call control device notifies the operation state of the own terminal to the state management server when the operation state of the own terminal changes from waiting to calling.
The state management server stores the identification information of the first communication terminal and the operation state of the first communication terminal in association with each other in response to the notification from the first communication terminal,
The second communication terminal under the control of the second call control device whose identification information is different from that of the first call control device acquires the identification information of the first communication terminal in the operating state during the call from the state management server,
The second call control device receives a proxy response request including the identification information of the first communication terminal from the second communication terminal, refers to the first information according to the request, and manages the identification information of the first communication terminal Identifying the first call control device as a call control device to perform,
The second call control device sends second information indicating that the communication terminal whose identification information is managed by its own device makes a proxy response to the incoming call to the first communication terminal to the identified first call control device. Send,
A proxy response method. The second communication terminal specifies the identification information of one or more communication terminals and notifies the state management server in advance,
The state management server stores the identification information of the second communication terminal and the identification information of the one or more communication terminals specified by the second communication terminal in association with each other,
The state management server notifies the second communication terminal of the change in the operation state each time the operation state of the one or more communication terminals designated by the second communication terminal changes.
The proxy response method according to claim 2, further comprising: The second communication terminal specifies the identification information of one or more communication terminals and notifies the state management server in advance,
The state management server stores the identification information of the second communication terminal and the identification information of the one or more communication terminals specified by the second communication terminal in association with each other,
The second communication terminal requests the state management server to notify the operation state of each of the one or more communication terminals in response to a predetermined proxy response operation on the own terminal,
The second communication terminal specifies identification information of the communication terminal in the calling state in the operation state notified from the state management server.
The proxy response method according to claim 2, further comprising:

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