JP4094568B2 - IP telephone system, communication control method, and computer program therefor - Google Patents

Description

  The present invention relates to an IP telephone system, a communication control method, and a computer program for realizing a call pickup function by controlling a call between IP telephone terminals.

Conventional IP telephone technology mainly provides basic functions such as outgoing call, incoming call, and hold for individual users. On the other hand, as a function in a conventional public telephone network for a corporate user, there is an advanced function such as a call pickup that receives an incoming call to a terminal other than the own terminal by operating the terminal. A similar function is also required in an IP telephone network for enterprises, and efforts to provide a function such as call pickup have been started (see, for example, Non-Patent Document 1).
“The PBX function of SIP phones is very difficult”, Nikkei Communications, Nikkei BP, October 13, 2003, No. 400, p. 74-75 "

  However, the call pickup function of the IP telephone system in the prior art is realized by exchanging unique signals in a partly limited terminal developed by a specific company or a call control management device. Therefore, there is a restriction that IP telephone terminals used in the same call control management device are limited to those having a specific function, and different terminals used by various corporate users are shared by one call control management device. There was a problem that it was difficult to use.

  The present invention has been made to solve the above problems, and its purpose is to implement a standard implementation even if the IP telephone terminal does not have a special function of sending a unique signal combined with the call control management device. It is to provide a call pickup function in an IP telephone.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a terminal number assigned to each terminal is set and a source IP telephone terminal and a destination IP telephone terminal having a SIP communication system, SIP that transmits a connection request signal of the SIP communication method to the destination IP telephone terminal corresponding to the terminal number of the destination included in the connection request signal when the connection request signal of the SIP communication method is received from the source IP telephone terminal In the IP telephone system including a call control management device having a communication method, the terminal number is set, and when the call pickup button or the call pickup special number is pressed, the service identification number indicating the call pickup is included. A call pickup IP telephone terminal equipped with a SIP communication system for transmitting a connection request signal to the call control management device is provided. The call control management device transmits the connection request signal to the destination IP telephone terminal and makes the call pickup from the call pickup IP telephone terminal during a connection request in which the destination IP telephone terminal is ringing. When the connection request signal including the service identification number is received, a connection abandonment signal is transmitted to the destination IP telephone terminal to release the ringing state of the destination IP telephone terminal, and the source IP telephone A connection notification signal including the terminal number of the call pickup IP telephone terminal is transmitted to the terminal, a connection notification signal including the terminal number of the source IP telephone terminal is transmitted to the call pickup IP telephone terminal, and the source IP telephone An IP telephone system for establishing a call between a terminal and the call pickup IP telephone terminal.

The invention described in claim 2 is the above-described invention, wherein there are a plurality of the source IP telephone terminal and the destination telephone terminal, and the call control management device stores the service identification number and the service type information. A first storage unit that stores the associated information; and a second storage unit that stores call identification information of a call for which a connection request is being made from the caller IP telephone terminal to the callee IP telephone terminal. When the connection request signal including the service identification number is received from the call pickup IP telephone terminal during the connection request in which the destination IP telephone terminal is ringing by transmitting the connection request signal to the IP telephone terminal, reading the service type information corresponding to the service identification number included in the connection request signal from said first storage unit, reading the service type information indicates a call pickup If, ringing of the read longest said call identification information stored in the second storage unit, destination IP telephone the call destination IP telephone terminal transmits a connection abandonment signal to the terminal to which the call identity information indicates The connection state signal including the terminal number of the call pickup IP telephone terminal is transmitted to the caller IP telephone terminal indicated by the call identification information, and the caller IP telephone terminal is connected to the caller IP telephone terminal. A connection notification signal including a terminal number of the terminal is transmitted to establish a call between the caller IP telephone terminal and the call pickup IP telephone terminal .

The invention of claim 3 is the invention described above, the call pickup IP telephone terminal includes a service identification number indicating the terminal designation information and the call pickup to specify the destination IP telephone terminal for call pickup transmits a connection request signal to the call control management device, the call control management device includes a first storage unit that stores in association with the service identification number and service type information, the terminal number and the terminal designation information A third storage unit that stores in advance, and a fourth storage unit that stores the terminal number of the destination IP telephone terminal of the call requesting connection and the call identification information of the call in association with each other; During the connection request in which the connection request signal is transmitted to the destination IP telephone terminal and the destination IP telephone terminal rings, the call pickup IP telephone terminal When receiving the connection request signal including a-bis identification number, reads the service type information corresponding to the service identification number included in the connection request signal from said first storage unit, reading the service type information Call Pickup when indicating the when the connection request signal including the terminal designation information, reads the terminal number corresponding to the terminal designation information from the third storage unit, corresponding to the terminal number from said fourth storage unit The call identification information is read out, a connection abandonment signal is transmitted to the destination IP telephone terminal indicated by the call identification information to release the ringing state of the destination IP telephone terminal, and the call indicated by the call identification information wherein transmits a connection notification signal including a terminal number of the call pickup IP telephone terminal based on the IP telephone terminal, the call pickup IP telephone terminal The originating transmits a connection notification signal including a terminal number of the source IP telephone terminal, and establishes a call between the call pickup IP telephone terminal and the source IP telephone terminal.

According to a fourth aspect of the present invention, in the above-described invention, a group number previously assigned to each group of terminals is set in the call pickup IP telephone terminal and the destination IP telephone terminal, and the call pickup IP telephone terminal transmits a connection request signal including a service identification number indicating the group specifying information and the call pickup specify a group of terminals that perform call pickup to the call control management device, the call control management device, the a first storage unit in association with each service identification number and service type information, wherein the connection request signal to the memory in advance in association with the group ID and the group specifying information included for receiving from said source IP telephone terminal a fifth storage unit, for each of said group number destination IP telephone terminal belongs, said source I A sixth storage unit for storing call identification information of a call for which a connection request is being made from the telephone terminal to the destination IP telephone terminal, and transmitting the connection request signal to the destination IP telephone terminal to transmit the destination IP When the connection request signal including the service identification number is received from the call pickup IP telephone terminal during a connection request in which the telephone terminal is ringing, the service corresponding to the service identification number included in the connection request signal reads type information from the first storage unit, when the read service type information indicates a call pickup, when the connection request signal including the group specifying information, to the group specifying information from said fifth storage unit reads the corresponding said group number, read the call identification information corresponding to the group number from the storage unit of the sixth, the call Release the state during ringing of the destination IP telephone terminal transmits a connection abandonment signal to the destination IP telephone terminal further information indicates,
A connection notification signal including the terminal number of the call pickup IP telephone terminal is transmitted to the IP telephone terminal of the caller indicated by the call identification information, and the connection including the terminal number of the caller IP telephone terminal is transmitted to the call pickup IP telephone terminal. It further comprises transmitting a notification signal and establishing a call between the caller IP telephone terminal and the call pickup IP telephone terminal .

According to a fifth aspect of the present invention, in the above-described invention, a terminal number assigned to each terminal is set, and a source IP telephone terminal and a destination IP telephone terminal each having a SIP communication system, a SIP communication system A call control management device comprising: the terminal number is set, and when the call pickup button or call pickup special number is pressed, the connection request signal including a service identification number indicating call pickup is sent to the call control management device A communication control method in an IP telephone system comprising a call pickup IP telephone terminal equipped with a SIP communication system for transmission, wherein the call control management device sends a connection request signal of the SIP communication system from the originating IP telephone terminal To the destination IP telephone terminal corresponding to the terminal number of the destination included in the connection request signal. In the process of transmitting a connection request signal of an IP communication system, and during the connection request in which the call control management device transmits the connection request signal to the destination IP telephone terminal and the destination IP telephone terminal rings When the connection request signal including the service identification number indicating the call pickup is received from the call pickup IP telephone terminal, a connection abandonment signal is transmitted to the destination IP telephone terminal to ring the destination IP telephone terminal The call control management device transmits a connection notification signal including a terminal number of the call pickup IP phone terminal to the caller IP phone terminal, and the call control management device releases the call state to the call pickup IP phone terminal. A connection notification signal including the terminal number of the original IP telephone terminal is transmitted, and the caller IP telephone terminal and the call pickup IP telephone terminal A process of establishing a call, a communication control method characterized by comprising the.

According to a fifth aspect of the present invention, in the above-described invention, a terminal number assigned to each terminal is set, and a source IP telephone terminal and a destination IP telephone terminal each having a SIP communication system, a SIP communication system A call control management device comprising: the terminal number is set, and when the call pickup button or call pickup special number is pressed, the connection request signal including a service identification number indicating call pickup is sent to the call control management device A call control management device computer in an IP telephone system comprising a call pickup IP telephone terminal having a SIP communication system to transmit, when receiving a connection request signal of the SIP communication system from the source IP telephone terminal, SIP communication method to the destination IP telephone terminal corresponding to the destination terminal number included in the connection request signal Transmitting the connection request signal of the call pickup IP telephone terminal from the call pickup IP telephone terminal during the connection request in which the connection request signal is transmitted to the destination IP telephone terminal and the destination IP telephone terminal is ringing. A procedure for transmitting a connection abandonment signal to the destination IP telephone terminal to release the ringing state of the destination IP telephone terminal when receiving the connection request signal including a service identification number indicating The management apparatus transmits a connection notification signal including the terminal number of the call pickup IP telephone terminal to the source IP telephone terminal, and a connection notification signal including the terminal number of the source IP telephone terminal to the call pickup IP telephone terminal To establish a call between the caller IP telephone terminal and the call pickup IP telephone terminal Is a computer program.

  According to the present invention, when the call control management device receives a connection request from the caller IP telephone terminal to the destination IP telephone terminal, the call control management device stores the call identification information related to the connection request in the order of reception. Is taking. Therefore, when receiving a call pickup request from another IP telephone terminal, the call control management device detects the call identification information of the call that has been in the connection request state for the longest time, and the call source indicated by the call identification information A call can be established between an IP telephone terminal and the other IP telephone terminal. As a result, an IP telephone terminal implementing a standard IP telephone communication procedure can perform call pickup via a call control management device by sending a standard call control signal including call pickup information. It becomes.

  Further, according to the present invention, when the call control management device receives a connection request from the caller IP telephone terminal to the callee IP telephone terminal, the call control information is sent to the callee ID telephone call information related to the connection request. It is configured to store in association with the terminal number of the terminal. Therefore, when receiving a call pickup request including terminal designation information from another IP telephone terminal, the call control management device detects a destination IP telephone terminal corresponding to the terminal designation information. Then, call identification information of a call for which a connection request is being made to the IP telephone terminal can be detected, and a call can be established between the originating IP telephone terminal indicated by the call identification information and the other IP telephone terminal. Thereby, in an IP telephone terminal that implements a standard IP telephone communication procedure, a terminal is designated via the call control management device by sending a standard call control signal including terminal designation and call pickup information. Call pickup can be performed.

  According to the present invention, when the call control management device receives a connection request from the caller IP telephone terminal to the callee IP telephone terminal, the call control information is sent to the callee IP telephone terminal. Is stored in the order of reception in units of groups. Therefore, when the call control management apparatus receives a call pickup request including group designation information from another IP telephone terminal, the call control management apparatus continues the longest connection request state in the group corresponding to the group designation information. By detecting the call identification information, a call can be established between the caller IP telephone terminal indicated by the call identification information and the other IP telephone terminal. Thereby, in an IP telephone terminal that implements a standard IP telephone communication procedure, a group is specified via the call control management device by sending a standard call control signal including group designation and call pickup information. Call pickup can be performed.

Hereinafter, a call control management device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a configuration of an IP telephone system including a call control management device according to an embodiment of the present invention.
In FIG. 1, a call control management device 1 accommodates an IP telephone terminal 50 via a data communication network 2 and receives a call control signal from the IP telephone terminal 50 to control connection and disconnection of a call. The data communication network 2 is, for example, a LAN (Local Area Network) in the case of a company premises, and in the case of a wide area network or the like, an IP layer or a MAC layer VPN (Virtual Private Network) provided by a communication carrier, etc. Become. In the figure, an IP telephone terminal 50 is provided with SIP (Session Initiation Protocol) of RFC 3261 standard, and is an IP telephone terminal capable of transmitting a call control signal including a service identification number representing a call pickup. A terminal number is set for each IP telephone terminal 50. The IP telephone terminals 50 are classified in advance as call pickup groups 60-A and 60-B for call pickup control in groups. The call pickup control for each group will be described later.

FIG. 2 is a block diagram showing an internal configuration of the call control management device 1 that implements call pickup.
In the figure, a central control unit 1a is, for example, a CPU (Central Processing Unit), receives a call control signal from the IP telephone terminal 50, analyzes information contained in the signal, and performs predetermined processing. The management memory unit 1b is a storage device such as a RAM (Random Access Memory) or a hard disk, and stores the following information. The service management information 10 is information that associates in advance with which service type the service identification number included in the call control signal received from the IP telephone terminal 50 corresponds to the service identification number. The connection request call order management information 11 is information in which call identification information of a call for which a connection request is being made is added in the order of reception for each group of call pickups. The incoming terminal identification information 12 is information that associates terminal designation information that designates the IP telephone terminal 50 included in the call control signal received from the IP telephone terminal 50 with the actual terminal number. The group identification information 13 is information that associates group designation information that designates a group of IP telephone terminals 50 included in a call control signal received from the IP telephone terminal 50 and an actual group number. The connection request call identification information 14 is information associating the terminal number of the destination of the call for which a connection request is being made with the call identification information. Call pickup processing between the IP telephone terminals 50 is performed using these pieces of information.

  FIG. 3 is a diagram showing an IP telephone terminal used when the call control management apparatus 1 performs a call pickup process. The IP telephone terminal in this embodiment is required to have a function of sending a special number used for call pickup control. If the IP telephone terminal supports the RFC3261 standard SIP, a special number for call pickup can be transmitted without adding a new function. If these functions are provided, an IP telephone terminal using call pickup may be a single telephone type 51 having only basic function buttons or a multi-functional telephone type 52 capable of various settings. Absent.

FIG. 4 is a diagram showing a process in the case of picking up a call for which a connection is requested under the conditions of no terminal designation and no group designation described later.
In the figure, as a premise of the process of performing call pickup, the IP telephone terminal 50-C has already transmitted a connection request to the IP telephone terminal 50-B. When the central control unit 1a of the call control management device 1 relays transmission, the central control unit 1a stores call identification information of a call for which a connection request is being made in the connection request call order management information 11 of the management memory unit 1b. Since the call identification information is stored in the connection request call order management information 11 so as to be added to the end of the queue, the longest stored call identification information can be read by reading the first of the queue. .
Under such a premise, (1) the IP telephone terminal 50-A transmits a call control signal including the service identification number of the call pickup to the call control management apparatus 1 in order to start call pickup control. (2) The central control unit 1a of the call control management device 1 reads the service identification number from the received call control signal, and detects the service type information corresponding to the service identification number from the service management information 10. (3) When the service type information is call pickup, the longest stored call identification information is read from the connection request call order management information 11. (4) Based on the read call identification information, the IP telephone terminal 50-A responds to the connection request of the IP telephone terminal 50-C, and between the IP telephone terminal 50-C and the IP telephone terminal 50-A. The call is established.

FIG. 5 is a diagram showing processing when a call is picked up by designating any one IP telephone terminal among the IP telephone terminals receiving the connection request.
Also in this figure, as a premise of the process of performing call pickup, IP telephone terminal 50-C has already transmitted a connection request to IP telephone terminal 50-B. When relaying the transmission, the central control unit 1a of the call control management device 1 sets the call identification information of the call that is requesting connection and the terminal number of the destination IP telephone terminal in the connection request call identification information 14 of the management memory unit 1b. Store it in association. Under such a premise, (1) the IP telephone terminal 50-A transmits a call control signal including a call pickup service identification number and terminal designation information to the call control management apparatus 1 in order to start call pickup. The terminal designation information includes information for designating the IP telephone terminal 50-B. (2) The central control unit 1a of the call control management device 1 reads the service identification number from the received call control signal, and detects the service type information corresponding to the service identification number from the service management information 10. (3) When the service type information is call pickup, terminal designation information is read from the received call control signal, and a terminal number corresponding to the terminal designation information is read from the receiving terminal identification information 12. (4) The call identification information corresponding to the terminal number is read from the connection request call identification information 14 based on the read terminal number. (5) Based on the read call identification information, the IP telephone terminal 50-A responds to the connection request of the IP telephone terminal 50-C, and between the IP telephone terminal 50-C and the IP telephone terminal 50-A. The call is established.

FIG. 6 is a diagram illustrating a process in the case of picking up a call for which a connection request for a different call pickup group is requested.
Also in this figure, as a premise of the process of performing call pickup, IP telephone terminal 50-C has already transmitted a connection request to IP telephone terminal 50-B. When relaying the transmission, the central control unit 1a of the call control management device 1 connects to the connection request call order management information 11 corresponding to the call pickup group 60-B to which the IP telephone terminal 50-B of the management memory unit 1b belongs. Stores call identification information of the requesting call. (1) The IP telephone terminal 50-A transmits a call control signal including a call pickup service identification number and group designation information to the call control management device 1 in order to start call pickup. The group designation information includes information for designating the call pickup group 60-B. (2) The central control unit 1a of the call control management device 1 reads the service identification number from the received call control signal, and detects the service type information corresponding to the service identification number from the service management information 10. (3) When the service type information is call pickup, the group designation information is read from the received call control signal, and the group number corresponding to the group designation information is read from the group identification information 13. (4) The longest stored call identification information is read from the information corresponding to the read group number. (5) Based on the read call identification information, the IP telephone terminal 50-A responds to the connection request of the IP telephone terminal 50-C, and between the IP telephone terminal 50-C and the IP telephone terminal 50-A. The call is established.
Also, in the figure, the call pickup processing in the case of no terminal designation and no group designation described above is performed by calling the call identification information from the IP telephone terminal 50-A's own call pickup group connection request call rank management information 11 that requests call pickup. The process shown in FIG. 6 includes the process described with reference to FIG.

FIG. 7 is a sequence diagram of call control signals in processing when a call requesting connection is picked up under the conditions of no terminal designation and no group designation. In the figure, IP telephone terminals 50-B and 50-C belong to the same call pickup group 60-A. In the figure, a solid line indicates a call control signal in which unique information for control is added to the header of a SIP standard message, and a broken line indicates a SIP standard call control signal.
The IP telephone terminal 50-A transmits a connection request to the call control management device 1 in order to start a call with the IP telephone terminal 50-B (step S7-1). The call control management device 1 receives the connection request from the IP telephone terminal 50-A and transmits the connection request to the IP telephone terminal 50-B. (Step S7-2). The IP telephone terminal 50-B starts ringing and responds to the call control management device 1 with the ringing signal (step S7-3). The call control management device 1 that has received the ringing signal from the IP telephone terminal 50-B responds to the IP telephone terminal 50-A with the ringing signal. At that time, the call control management device 1 adds the call requesting connection request to the call order management information of the connection request call order management information 11 corresponding to the call pickup group 60-A to which the destination IP telephone terminal 50-B belongs. Call identification information is added (step S7-4). In this state, the IP telephone terminal 50-C transmits a connection request (hereinafter referred to as a call pickup request) including a call pickup service identification number to the call control management device in order to pick up a call for which a connection request is being made. The call pickup request includes the terminal information of the IP telephone terminal 50-C (step S7-5). The call control management device 1 that has received the call pickup request determines that the request received from the service management information 10 is a call pickup. Then, the call identification information stored longest from the connection request call order management information 11 corresponding to the call pickup group 60-A of the IP telephone terminal 50-C that has transmitted the call pickup request from the connection request call order management information 11 is stored. read out. In this sequence, the read call identification information becomes call identification information between the IP telephone terminal 50-A and the IP telephone terminal 50-B. Then, a connection abandonment signal is transmitted to the IP telephone terminal 50-B set as the destination in the call identification information, and the ringing state of the IP telephone terminal 50-B is released (step S7-6). . The call control management device 1 transmits a connection notification including the terminal number of the IP telephone terminal 50-A to the IP telephone terminal 50-C (step S7-7), and the IP telephone terminal 50-A receives the IP telephone terminal 50-A. A connection notification including the terminal number of C is transmitted (step S7-8). Then, a call is established between IP telephone terminal 50-A and IP telephone terminal 50-C.

FIG. 8 is a sequence diagram of a call control signal in processing when a call is picked up by designating any one IP telephone terminal that is receiving a connection request. Also in the figure, a solid line indicates a call control signal in which unique information for control is added to the header of a SIP standard message, and a broken line indicates a SIP standard call control signal.
The IP telephone terminal 50-A transmits a connection request to the call control management device 1 in order to start a call with the IP telephone terminal 50-C (step S8-1). The call control management device 1 receives the connection request from the IP telephone terminal 50-A and transmits the connection request to the IP telephone terminal 50-C (step S8-2). The IP telephone terminal 50-B also transmits a connection request to the call control management device 1 to start a call with the IP telephone terminal 50-D (step S8-3). The call control management device 1 receives the connection request from the IP telephone terminal 50-B and transmits the connection request to the IP telephone terminal 50-D (step S8-4). The IP telephone terminal 50-C starts ringing and responds to the call control management device 1 with the ringing signal (step S8-5). The IP telephone terminal 50-D also starts ringing and responds to the call control management device 1 with the ringing signal (step S8-6). The call control management device 1 that has received the ringing signal from the IP telephone terminal 50-C responds to the IP telephone terminal 50-A with the ringing signal. At that time, the call control management device 1 adds information relating the terminal information of the IP telephone terminal 50-C and the call identification information of the call for which the connection is requested to the connection request call identification information 14 (step S8-7). . Similarly, the ringing signal is returned to IP telephone terminal 50-B. Also in this case, information that associates the terminal information of the IP telephone terminal 50-D and the call identification information of the call that is requesting connection is added to the connection request call identification information 14 (step S8-8). In this state, the IP telephone terminal 50-E transmits a call pickup request to the call control management device to designate the IP telephone terminal 50-D and pick up the call. The call pickup request includes the terminal information of the IP telephone terminal 50-E and terminal designation information for designating the IP telephone terminal 50-D (step S8-9). The call control management device 1 that has received the call pickup request determines that the request received from the service management information 10 is a call pickup. Next, the terminal number of the IP telephone terminal corresponding to the terminal designation information is acquired from the receiving terminal identification information 12. In this sequence, the corresponding IP telephone terminal is IP telephone terminal 50-D. Then, the call identification information of the connection request corresponding to the IP telephone terminal 50-D is read from the connection request call identification information 14, and the connection is abandoned to the IP telephone terminal 50-D set as the destination in the call identification information. A signal is transmitted (step S8-10). Next, the call control management device 1 transmits a connection notification including the terminal number of the IP telephone terminal 50-A to the IP telephone terminal 50-E (step S8-11), and the IP telephone terminal 50-B receives the IP telephone. A connection notification including the terminal number of the terminal 50-C is transmitted (step S8-12). Then, a call is established between IP telephone terminal 50-B and IP telephone terminal 50-E.

FIG. 9 is a sequence diagram of call control signals in a process for picking up a call for which a connection request for a different call pickup group is requested. In the figure, IP telephone terminal 50-B belongs to call pickup group 60-A, and IP telephone terminal 50-C belongs to call pickup group 60-B. Also in the figure, a solid line indicates a call control signal in which unique information for control is added to the header of a SIP standard message, and a broken line indicates a SIP standard call control signal.
The IP phone terminal 50-A transmits a connection request to the call control management device 1 to start a call with the IP phone terminal 50-B (step S9-1). The call control management device 1 receives the connection request from the IP telephone terminal 50-A and transmits the connection request to the IP telephone terminal 50-B (step S9-2). The IP telephone terminal 50-B starts ringing and responds to the call control management device 1 with the ringing signal (step S9-3). The call control management device 1 that has received the ringing signal from the IP telephone terminal 50-B responds to the IP telephone terminal 50-A with the ringing signal. At this time, the call control management device 1 adds the call requesting the connection request to the call order management information of the connection request call order management information 11 corresponding to the call pickup group 60-A to which the IP telephone terminal 50-B, which is the destination, belongs. Is added (step S9-4). In this state, the IP telephone terminal 50-C transmits a call pickup request to the call control management device in order to pick up a call for which a connection request for the call pickup group 60-A is being made. The call pickup request includes terminal information of the IP telephone terminal 50-C and group designation information for designating the call pickup group 60-A (step S9-5). The call control management device 1 that has received the call pickup request determines that the request received from the service management information 10 is a call pickup. Then, the call pickup group corresponding to the group designation information is detected from the group identification information 13. Here, the call pickup group 60-A is detected. Then, the information of the call pickup group 60-A is read from the connection request call order management information 11, and the call identification information stored for the longest time among the information is read. In this sequence, the read connection request information is call identification information between the IP telephone terminal 50-A and the IP telephone terminal 50-B. Then, a connection abandonment signal is transmitted to the IP telephone terminal 50-B set as the destination in the call identification information, and the ringing state of the IP telephone terminal 50-B is released (step S9-6). . The call control management device 1 transmits a connection notification including the terminal number of the IP telephone terminal 50-A to the IP telephone terminal 50-C (step S9-7), and the IP telephone terminal 50-A receives the IP telephone terminal 50-A. A connection notification including the terminal number of C is transmitted (step S9-8). Then, a call is established between IP telephone terminal 50-A and IP telephone terminal 50-C.

10 to 12 are flowcharts showing the internal processing of the call control management device 1. The internal processing of the call control management apparatus 1 will be described with reference to FIGS.
FIG. 10 is a sequence of internal processing in the call control management apparatus 1 when there is no terminal designation and group designation. When the call control management device 1 is activated, it waits for reception of a connection request from the IP telephone terminal (step S1). When a connection request is received, a transition is made to a connection request reception state (step S2). It is determined whether the service type of the received connection request is call pickup (step S3). If it is not a call pickup, a connection request is transmitted to the connection destination IP telephone terminal based on the connection request (step S4). A ringing request is received from the connection destination IP telephone terminal (step S5), and the ringing request is transmitted to the connection source IP telephone terminal (step S6). Then, call identification information of the connection request call is registered in the connection request call order management information 11 (step S7). Next, the process branches depending on the type of the received signal (step S8). When a connection response notification is received, the connection notification is transmitted to the IP telephone terminal of the connection source (step S9). Then, the connection request is deleted from the connection request call order management information 11 (step S10). Thereafter, when the call is disconnected, a disconnection process is performed (step S11), and the process returns to the state of step S1 (step S12). In the state of step S9, when a connection request is further received, the state returns to the state of step S2 (step S13).
If it is determined in step S3 that the service type of the connection request is call pickup, the call identification information of the call in the oldest connection request from the call identification information registered in the connection request call rank management information 11, that is, the longest. The stored call identification information is searched (step S20). It is determined whether a connection request exists (step S21). If there is no call identification information, an error response is returned to the IP telephone terminal that requested the call pickup (step S22). And it returns to the state of step S1 (step S23). If the call identification information exists, the terminal information of the connection destination IP telephone terminal is detected from the call identification information (step S24). Next, the connection halfway abandonment is transmitted to the connection destination IP telephone terminal (step S25). Then, the terminal number of the connection source IP telephone terminal is transmitted to the IP telephone terminal that has requested the call pickup, and the terminal number of the IP telephone terminal that has requested the call pickup is transmitted to the connection source IP telephone terminal (step S26). Then, a call is established (step S27). Thereafter, when the call is disconnected, a disconnection process is performed (step S28), and the process returns to the state of step S1 (step S29).

  FIG. 11 is a flowchart showing internal processing in the call control management apparatus 1 when there is terminal designation and group designation. In the figure, a case where terminal designation is mainly included will be described. Since step S1 to step S13 are the same processing, description is abbreviate | omitted. If the service type of the connection request is call pickup, it is next determined whether the terminal or group designation is included (step S30). If not included, the process proceeds to the process A in FIG. 10, that is, the process of step S20 described in FIG. If it is included, it is determined whether the terminal is designated or the group is designated (step S31). In the case of terminal designation, the terminal number of the destination IP telephone terminal corresponding to the terminal designation number is detected from the receiving terminal identification information 12 (step S32). Next, the call identification information of the call in the connection request corresponding to the terminal number detected from the connection request call identification information 14 is read, and the information of the connection destination IP telephone terminal is detected from the call identification information (step S33). Next, the connection halfway abandonment is transmitted to the connection destination IP telephone terminal (step S34). Then, the terminal number of the connection source IP telephone terminal is transmitted to the IP telephone terminal that has requested the call pickup, and the terminal number of the IP telephone terminal that has requested the call pickup is transmitted to the connection source IP telephone terminal (step S35). Then, a call is established (step S36). Thereafter, when the call is disconnected, a disconnection process is performed (step S37), and the state returns to step S1 (step S38). The group designation in step S31 will be described with reference to FIG.

  FIG. 12 is a flowchart showing internal processing in the call control management apparatus 1 when the connection request includes group designation. A call pickup group corresponding to the group designation number is detected from the group identification information 13 (step S40). The call identification information of the call with the oldest connection request is retrieved from the calls registered in the call order management information of the connection request call order management information 11 corresponding to the detected call pickup group (step S41). It is determined whether call identification information exists (step S42). If there is no call identification information, an error response is returned to the IP telephone terminal that requested the call pickup (step S43). And it returns to the state of step S1 (step S44). If the call identification information exists, the information of the connection destination IP telephone terminal is acquired from the call identification information (step S45). Next, the connection halfway abandonment is transmitted to the connection destination IP telephone terminal (step S46). Then, the terminal number of the connection source IP telephone terminal is transmitted to the IP telephone terminal that has requested the call pickup, and the terminal number of the IP telephone terminal that has requested the call pickup is transmitted to the connection source IP telephone terminal (step S47). Then, a call is established (step S48). Thereafter, when the call is disconnected, a disconnection process is performed (step S49), and the process returns to the state of step S1 (step S50).

The call control management apparatus described above has a computer system inside. The call pickup process described above is stored in a computer-readable recording medium in a program format, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

It is a block diagram of the IP telephone system in one Embodiment of this invention. It is an internal block diagram of the call control management apparatus in the same embodiment. It is a figure which shows button arrangement | positioning etc. of the IP telephone terminal in the embodiment. FIG. 10 is a processing diagram of call pickup under the conditions of no terminal designation and no group designation in the same embodiment. FIG. 10 is a processing diagram of call pickup under a condition with terminal designation in the embodiment. FIG. 6 is a processing diagram of call pickup under a condition with group designation in the embodiment. FIG. 7 is a sequence diagram of call pickup processing under conditions where no terminal is specified and no group is specified in the embodiment. FIG. 6 is a sequence diagram of call pickup processing under a condition with terminal designation in the embodiment. FIG. 11 is a sequence diagram of call pickup processing under a condition with group designation in the embodiment. It is a flowchart of a call pickup process under conditions without terminal designation and group designation in the same embodiment. 4 is a flowchart of call pickup processing under a condition where a terminal is specified in the embodiment. 4 is a flowchart of call pickup processing under a condition with group designation in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Call control management apparatus 1a Central control part 1b Management memory part 10 Service management information 11 Connection request call order management information 50 IP telephone terminal

Claims (6)

  When a terminal number assigned to each terminal is set, and a source IP telephone terminal and a destination IP telephone terminal equipped with a SIP communication system, and a connection request signal of the SIP communication system is received from the source IP telephone terminal, An IP telephone system comprising: a call control management device having a SIP communication method for transmitting a connection request signal of a SIP communication method to a destination IP telephone terminal corresponding to a destination terminal number included in the connection request signal ,
  A call having a SIP communication method for transmitting the connection request signal including a service identification number indicating call pickup to the call control management device when the terminal number is set and a call pickup button or a call pickup special number is pressed. It has a pickup IP phone terminal,
  The call control management device comprises:
  The connection including a service identification number indicating the call pickup from the call pickup IP telephone terminal during a connection request for transmitting the connection request signal to the destination IP telephone terminal and ringing the destination IP telephone terminal When the request signal is received, a connection abandonment signal is transmitted to the destination IP telephone terminal to release the ringing state of the destination IP telephone terminal,
  Transmitting a connection notification signal including the terminal number of the call pickup IP telephone terminal to the source IP telephone terminal, transmitting a connection notification signal including the terminal number of the source IP telephone terminal to the call pickup IP telephone terminal; Establishing a call between the originating IP telephone terminal and the call pickup IP telephone terminal
  An IP telephone system characterized by the above. There are a plurality of the source IP telephone terminals and the destination IP telephone terminals,
The call control management device comprises:
A first storage unit for storing the service identification number and service type information in association with each other;
A second storage unit that stores call identification information of a call that is requesting connection from the source IP telephone terminal to the destination IP telephone terminal;
The connection request signal including the service identification number is received from the call pickup IP telephone terminal during a connection request in which the destination IP telephone terminal is ringing by transmitting the connection request signal to the destination IP telephone terminal If the service type information corresponding to the service identification number included in the connection request signal is read from the first storage unit and the read service type information indicates a call pickup, the second storage unit Read the call identification information stored for the longest time , send a connection abandonment signal to the destination IP telephone terminal indicated by the call identification information to release the ringing state of the destination IP telephone terminal,
A connection notification signal including the terminal number of the call pickup IP telephone terminal is transmitted to the IP telephone terminal of the caller indicated by the call identification information, and the connection including the terminal number of the caller IP telephone terminal is transmitted to the call pickup IP telephone terminal. 2. The IP telephone system according to claim 1 , wherein a notification signal is transmitted to establish a call between the caller IP telephone terminal and the call pickup IP telephone terminal . The call pickup IP telephone terminal
Transmit a connection request signal including a service identification number indicating the terminal designation information and the call pickup to specify the destination IP telephone terminal for call pickup to the call control management device,
The call control management device comprises:
A first storage unit for storing the service identification number and service type information in association with each other;
A third storage unit for storing in advance in association with the terminal number and the terminal designation information,
A fourth storage unit that associates and stores the terminal number of the destination IP telephone terminal of the call requesting connection and the call identification information of the call ;
The connection request signal including the service identification number is received from the call pickup IP telephone terminal during a connection request in which the destination IP telephone terminal is ringing by transmitting the connection request signal to the destination IP telephone terminal If the service type information corresponding to the service identification number included in the connection request signal is read from the first storage unit and the read service type information indicates a call pickup, the connection request signal is When the designation information is included , the terminal number corresponding to the terminal designation information is read from the third storage unit, the call identification information corresponding to the terminal number is read from the fourth storage unit, and the call identification A connection abandonment signal is transmitted to the destination IP telephone terminal indicated by the information to release the ringing state of the destination IP telephone terminal;
A connection notification signal including the terminal number of the call pickup IP telephone terminal is transmitted to the IP telephone terminal of the caller indicated by the call identification information, and the connection including the terminal number of the caller IP telephone terminal is transmitted to the call pickup IP telephone terminal. 2. The IP telephone system according to claim 1 , wherein a notification signal is transmitted to establish a call between the caller IP telephone terminal and the call pickup IP telephone terminal . In the call pickup IP telephone terminal and the destination IP telephone terminal, a group number assigned in advance for each group of terminals is set,
The call pickup IP telephone terminal
Transmit a connection request signal including a service identification number indicating the group specifying information and the call pickup specify a group of terminals that perform call pickup to the call control management device,
The call control management device comprises:
A first storage unit for storing the service identification number and service type information in association with each other;
A fifth storage unit for storing in advance in association with the group ID and the group specifying information included in the connection request signal received from the source IP telephone terminal,
A sixth storage unit that stores call identification information of a call for which a connection request is being made from the caller IP phone terminal to the callee IP phone terminal for each group number to which the callee IP phone terminal belongs;
The connection request signal including the service identification number is received from the call pickup IP telephone terminal during a connection request in which the destination IP telephone terminal is ringing by transmitting the connection request signal to the destination IP telephone terminal If the service type information corresponding to the service identification number included in the connection request signal is read from the first storage unit, and the read service type information indicates a call pickup, the connection request signal is the group When the designation information is included , the group number corresponding to the group designation information is read from the fifth storage unit, the call identification information corresponding to the group number is read from the sixth storage unit, and the call identification A state in which the destination IP telephone terminal is ringing by transmitting a connection abandonment signal to the destination IP telephone terminal indicated by the information Released,
A connection notification signal including the terminal number of the call pickup IP telephone terminal is transmitted to the IP telephone terminal of the caller indicated by the call identification information, and the connection including the terminal number of the caller IP telephone terminal is transmitted to the call pickup IP telephone terminal. 2. The IP telephone system according to claim 1 , wherein a notification signal is transmitted to establish a call between the caller IP telephone terminal and the call pickup IP telephone terminal .   A terminal number assigned to each terminal is set, a source IP telephone terminal and a destination IP telephone terminal equipped with a SIP communication method, a call control management device equipped with a SIP communication method, and the terminal number are set. A call pickup IP telephone terminal equipped with a SIP communication method for transmitting the connection request signal including a service identification number indicating call pickup to the call control management device when a call pickup button or a call pickup special number is pressed; A communication control method in an IP telephone system comprising:
When the call control management device receives an SIP communication system connection request signal from the source IP telephone terminal, the SIP communication system is sent to the destination IP telephone terminal corresponding to the terminal number of the destination included in the connection request signal. Sending the connection request signal of
  The call control management device transmits the connection request signal to the destination IP phone terminal and indicates the call pickup from the call pickup IP phone terminal during a connection request in which the destination IP phone terminal is ringing. When receiving the connection request signal including a service identification number, a process of transmitting a connection abandonment signal to the destination IP telephone terminal to release the ringing state of the destination IP telephone terminal;
  The call control management device transmits a connection notification signal including the terminal number of the call pickup IP telephone terminal to the source IP telephone terminal, and includes the terminal number of the source IP telephone terminal to the call pickup IP telephone terminal Transmitting a connection notification signal and establishing a call between the caller IP telephone terminal and the call pickup IP telephone terminal;
  A communication control method comprising:   A terminal number assigned to each terminal is set, a source IP telephone terminal and a destination IP telephone terminal equipped with a SIP communication method, a call control management device equipped with a SIP communication method, and the terminal number are set. A call pickup IP telephone terminal equipped with a SIP communication method for transmitting the connection request signal including a service identification number indicating call pickup to the call control management device when a call pickup button or a call pickup special number is pressed; In the computer of the call control management device in the provided IP telephone system,
When a connection request signal of the SIP communication system is received from the source IP telephone terminal, a connection request signal of the SIP communication system is transmitted to the destination IP telephone terminal corresponding to the destination terminal number included in the connection request signal procedure,
  The connection including a service identification number indicating the call pickup from the call pickup IP telephone terminal during a connection request for transmitting the connection request signal to the destination IP telephone terminal and ringing the destination IP telephone terminal A procedure for releasing a connection abandonment signal to the destination IP telephone terminal and releasing the ringing state of the destination IP telephone terminal when the request signal is received;
  The call control management device transmits a connection notification signal including the terminal number of the call pickup IP telephone terminal to the source IP telephone terminal, and includes the terminal number of the source IP telephone terminal to the call pickup IP telephone terminal Sending a connection notification signal and establishing a call between the caller IP telephone terminal and the call pickup IP telephone terminal;
  A computer program for running.

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