JP5218149B2 - COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, AND COMMUNICATION CONTROL PROGRAM - Google Patents

Description

  The present invention relates to a communication control device, a communication control method, and a communication control program. More specifically, when there is a registration request from a plurality of call terminals to which the same identification information is assigned to a registration list for managing call terminals that are allowed to call, a call terminal that has previously received a registration request is displayed. The present invention relates to a communication control apparatus, a communication control method, and a communication control program that preferentially register a registration list.

  SIP (Session Initiation Protocol) is known as a bidirectional communication protocol for a communication terminal to start communication on a network such as the Internet. SIP is attracting attention because it can be used as a protocol for controlling the connection of videophones, instant messages, and the like, as well as being used as a protocol for controlling IP telephone calls.

  In an IP telephone system using SIP, a SIP address for identifying a user is assigned to each call terminal. In a communication control device (SIP server (registrar server) or the like) that performs communication control for a call, an SIP address and information for specifying each call terminal (hereinafter referred to as “terminal specifying information”, for example, an IP address) are provided. Corresponding and registered. As a result, it is possible to specify a call destination at the start of a call between call terminals. Conventionally, a communication control apparatus that performs such registration management has been proposed (see Patent Document 1). Normally, the registration of the SIP address and the terminal identification information to the communication control apparatus is executed when the communication control apparatus receives a registration request signal (eg, REGISTER command) transmitted from the call terminal.

  There is a demand for a usage pattern in which one user owns a plurality of call terminals and selects and uses one of the call terminals according to the place and situation. In such a usage pattern, the same SIP address is assigned to a plurality of call terminals. In this case, the communication control apparatus receives registration request signals transmitted from a plurality of call terminals to which the same SIP address is assigned. Here, in order to realize a call between call terminals, the communication control apparatus must select and register a single call terminal.

JP 2002-152805 A

  However, for example, if the communication control device determines that the registration request signal received later is valid and registers the call terminal with priority on the registration request signal, the call terminals that are allowed to be called are changed one after another. There was a problem.

  The present invention has been made to solve the above-described problems, and provides a communication control device, a communication control method, and a communication control program in which call terminals that are allowed to make a call are not changed one after another. With the goal.

In order to solve the above-mentioned problems, the communication control device according to the first aspect of the present invention is a communication control device that controls communication for a call between call terminals, and a registration list in which the call terminals are registered. When a call request signal that is a signal for requesting a call is received from the registered call terminal, the call is executed, and when the call request signal is received from the unregistered call terminal The first storage means for storing the registration list for performing call control without executing a call, and the identification information that is information assigned to the call terminal for identifying the call terminal are the same call terminal. In the case where there are a plurality of one call terminals, the signal is a signal transmitted from at least one of the plurality of first call terminals and is a signal requesting registration in the registration list. A first reception control means for receiving a request signal; and the first reception control means for receiving the registration request signal transmitted by any one of the plurality of first call terminals, wherein one of the call terminal, if the second call terminal and the first call terminal which is different from the first call terminal which transmitted the registration request signal is not registered in said stored registration list in the first storage means to the first call terminal which transmitted the registration request signal and the first registration control means for registering in the registration list, one of the plurality of first copies talking terminal, in the first reception control means sends When the registration request signal is received and the second call terminal is registered in the registration list stored in the first storage means, the first call terminal that has transmitted the registration request signal To the registration list A second register control means for inhibiting recording, a signal transmitted from one of said plurality of first call terminal receives the authorization request signal is a signal for requesting registration permission to the registration list A second reception control unit , wherein the second registration control unit receives the registration request signal transmitted from the first call terminal that has transmitted the permission request signal by the second reception control unit. The first call terminal that has transmitted the permission request signal is registered in the registration list, and then the second call terminal is deleted from the registration list .

According to a second aspect of the present invention , there is provided a communication control device for controlling communication for a call between call terminals, a registration list in which the call terminals are registered and registered. Call control is performed when a call request signal, which is a signal for requesting a call, is received from the call terminal, and is not executed when the call request signal is received from an unregistered call terminal. When there are a plurality of first call terminals that are the same call terminals having the same identification information that is assigned to the call terminals to identify the call terminals and the first storage means for storing the registration list for And receiving a registration request signal which is a signal transmitted from at least one of the plurality of first call terminals and which requests registration in the registration list. And when the registration request signal transmitted by any of the plurality of first call terminals is received by the first reception control means, and among the plurality of first call terminals, When a second call terminal that is a first call terminal different from the first call terminal that has transmitted the registration request signal is not registered in the registration list stored in the first storage means, the registration request signal is When the registration request signal transmitted by any one of the plurality of first call terminals is received by the first registration control means for registering the transmitted first call terminal in the registration list and the first reception control means When the second call terminal is registered in the registration list stored in the first storage means, registration of the first call terminal that has transmitted the registration request signal to the registration list is prohibited. Second registration system And means, a second memory means for setting information of the permission for registration in the registration list of particular the first call terminal is stored, the second register control means, the specific to the second storage means Is stored when setting information for permitting registration of the first call terminal to the registration list is received, and when the registration request signal is received from the specific first call terminal, One call terminal is registered in the registration list, and then the second call terminal is deleted from the registration list.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the communication control device further comprises a mid-call judging means for judging whether or not the second call terminal is busy. The registration list of the first call terminal which has transmitted the registration request signal when the second call control means determines that the second call terminal is busy. Registration is not performed, and deletion of the second call terminal from the registration list is not performed.

According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the invention, the communication control device according to the fourth aspect of the present invention includes a case where the second call terminal determines that the second call terminal is busy. When the registration request signal transmitted by any one of the plurality of first call terminals is received by the first receiving means, the second call terminal registered in the registration list is busy. Provided is a second transmission control means for transmitting a call in-call notification signal, which is a signal for notifying registration to the registration list, to the first call terminal that has transmitted the registration request signal.

According to a fifth aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the communication control device further comprises a mid-call judging means for judging whether or not the second call terminal is busy. And the second registration control means, when the call determining means determines that the second call terminal is calling, adds the first call terminal that has transmitted the registration request signal to the registration list. And the second call terminal is not deleted from the registration list.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect of the invention, the first call terminal and the second call terminal that have transmitted the registration request signal are registered in the registration list. The third registration for deleting the second call terminal that has ended the call from the registration list when the call determination unit determines that the call of the second call terminal has ended in the state of being held Control means are provided.

According to a seventh aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the communication control device according to the seventh aspect includes the second registration control means, wherein the first call terminal that has transmitted the registration request signal is the first call terminal. The first call terminal and the second call terminal registered in the registration list are different from those registered in the registration list until the second call terminal is deleted from the registration list. The call transmitted from the third call terminal, which is a call terminal registered in the registration list, to the identification information assigned to the first call terminal and the second call terminal registered in the registration list Third reception control means for receiving a request signal, and third transmission control means for transmitting the call request signal to the second call terminal when the call request signal is received by the third reception control means And be prepared And are

According to an eighth aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the communication control device according to the eighth aspect is configured such that the second registration control means includes the first call terminal that has transmitted the registration request signal. Sent from at least one of the first call terminal and the second call terminal registered in the registration list after the registration to the registration list and before the second call terminal is deleted from the registration list A fourth reception control means for receiving the call request signal for requesting a call with another call terminal, and the fourth reception control means for receiving the call request signal. And a fourth transmission control means for transmitting the call request signal to the other call terminal.

The communication control method of the invention according to claim 9 is a communication control method for controlling communication for a call between call terminals, and is information assigned to the call terminal to identify the call terminal. When there are a plurality of first call terminals having the same identification information, a signal transmitted from at least one of the plurality of first call terminals, and a call from the registered call terminal The first memory is used to perform call control so that a call is executed when a call request signal that is a request signal is received and no call is executed when the call request signal is received from an unregistered call terminal. A first reception control step for receiving a registration request signal that is a signal for requesting registration in the registration list stored in the means, and the plurality of first communication steps in the first reception control step. A case of receiving the registration request signal or sent out of the terminal, among the plurality of first call terminal, is different from the first call terminal and the first call terminal which has transmitted the registration request signal A first registration control step of registering the first call terminal that has transmitted the registration request signal in the registration list when the second call terminal is not registered in the registration list stored in the first storage unit; , a case of receiving the registration request signal or sent out of the first reception control the plurality of first copies talking terminal, in step, said the stored the registration list in the first storage means If the second call terminal is registered, and a second registration control step of prohibiting the registration in the registration list of the first call terminal which has transmitted the registration request signal, which of said plurality of first call terminal A signal transmitted from a second reception control step of receiving a permission request signal is a signal for requesting registration permission to the registration list, the second registration control step, said second reception control If the registration request signal transmitted from the first call terminal that transmitted the permission request signal in step is received, the first call terminal that transmitted the permission request signal is registered in the registration list; The second call terminal is deleted from the registration list .

  The communication control method of the invention according to claim 10 is a communication control method for controlling communication for a call between call terminals, and is information assigned to the call terminal to identify the call terminal. When there are a plurality of first call terminals having the same identification information, a signal transmitted from at least one of the plurality of first call terminals, and a call from the registered call terminal The first memory is used to perform call control so that a call is executed when a call request signal that is a request signal is received and no call is executed when the call request signal is received from an unregistered call terminal. A first reception control step for receiving a registration request signal that is a signal for requesting registration in the registration list stored in the means; and A first call terminal that is different from the first call terminal that has transmitted the registration request signal, among the plurality of first call terminals, when the registration request signal transmitted by any of the talk terminals is received. A first registration control step of registering, in the registration list, the first call terminal that has transmitted the registration request signal when a second call terminal is not registered in the registration list stored in the first storage means. And when receiving the registration request signal transmitted by any one of the plurality of first call terminals in the first reception control step, the registration list stored in the first storage unit includes the registration request signal. A second registration control step for prohibiting registration of the first call terminal that has transmitted the registration request signal to the registration list when the second call terminal is registered, the second registration control step comprising: Setting information for permitting the registration of the specific first call terminal to the registration list is stored in the second storage means for storing the setting information on whether or not the specific first call terminal is registered in the registration list. If the registration request signal is received from the specific first call terminal, the specific first call terminal is registered in the registration list, and then the second call terminal is It is characterized by deleting from the registration list.
  The communication control program of the invention according to claim 11 is a communication control program for controlling communication for a call between call terminals, and is information assigned to the call terminal for identifying the call terminal. In the case where there are a plurality of first call terminals having the same identification information, the signal is transmitted from at least one of the plurality of first call terminals, and the registered call terminal In order to perform call control to execute a call when receiving a call request signal, which is a signal requesting a call from, and not to execute a call when receiving the call request signal from an unregistered call terminal. A first reception control step for receiving a registration request signal which is a signal for requesting registration in a registration list stored in one storage means; and the first reception control step And when the registration request signal transmitted by any one of the plurality of first call terminals is received, the first call terminal transmitting the registration request signal among the plurality of first call terminals. When a second call terminal that is a different first call terminal is not registered in the registration list stored in the first storage means, the first call terminal that has transmitted the registration request signal is registered in the registration list. When the registration request signal transmitted from any of the plurality of first call terminals is received in the first registration control step and the first reception control step, and is stored in the first storage means. A second registration control step for prohibiting registration of the first call terminal that has transmitted the registration request signal to the registration list when the second call terminal is registered in the registration list; one A second transmission control step of receiving a permission request signal, which is a signal transmitted from any of the talk terminals and requesting permission for registration in the registration list, and causing the computer of the communication control device to execute, When the second registration control step receives the registration request signal transmitted from the first call terminal that transmitted the permission request signal in the second reception control step, the second registration control step transmits the permission request signal. One call terminal is registered in the registration list, and then the second call terminal is deleted from the registration list.
  A communication control program according to a twelfth aspect of the invention is a communication control program for controlling communication for a call between call terminals, and is information assigned to the call terminal for identifying the call terminal. In the case where there are a plurality of first call terminals having the same identification information, the signal is transmitted from at least one of the plurality of first call terminals, and the registered call terminal In order to perform call control to execute a call when receiving a call request signal, which is a signal requesting a call from, and not to execute a call when receiving the call request signal from an unregistered call terminal. A first reception control step for receiving a registration request signal which is a signal for requesting registration in a registration list stored in one storage means; and the first reception control step And when the registration request signal transmitted by any one of the plurality of first call terminals is received, the first call terminal transmitting the registration request signal among the plurality of first call terminals. When a second call terminal that is a different first call terminal is not registered in the registration list stored in the first storage means, the first call terminal that has transmitted the registration request signal is registered in the registration list. When the registration request signal transmitted from any of the plurality of first call terminals is received in the first registration control step and the first reception control step, and is stored in the first storage means. A second registration control step for prohibiting registration of the first call terminal that has transmitted the registration request signal to the registration list when the second call terminal is registered in the registration list; The second registration control step is configured to store the setting information on whether or not to register the specific first call terminal in the registration list in the second storage unit. When setting information permitting registration in the registration list is stored and the registration request signal is received from the specific first call terminal, the specific first call terminal is added to the registration list. And then deleting the second call terminal from the registration list.

  In the communication control apparatus according to the first aspect of the present invention, a registration list for managing a call terminal that causes a call to be executed when a call request signal is received (hereinafter referred to as “permit call”) is stored in the first storage means. I remember it. And when the registration request signal is received from any of the first call terminals, and the second call terminal different from the first call terminal that transmitted the registration request signal is not registered in the registration list, The first call terminal that has transmitted the registration request signal is registered in the registration list. On the other hand, if the second call terminal is already registered in the registration list, the first call terminal that has transmitted the registration request signal is not registered in the registration list.

As described above, when registration request signals are received from a plurality of call terminals having the same identification information, the call terminals previously registered in the registration list are preferentially left in the registration list to allow the call. As a result, it is possible to prevent a call terminal that has transmitted a registration request signal later from being registered as a call terminal that permits a call. Therefore, it is possible to prevent a problem that the terminals that are allowed to talk are changed one after another.
In addition, when the permission request signal is received from the call terminal, the registration request signal is transmitted even when another call terminal to which the same identification information is already assigned is registered in the registration list. Register the call terminal in the registration list. As a result, it is possible to forcibly delete the call terminal previously registered in the registration list from the registration list and register the call terminal that has transmitted the registration request signal later in the registration list.

In the communication control apparatus according to the second aspect of the present invention, a registration list for managing a call terminal that executes a call when receiving a call request signal (hereinafter referred to as “permit call”) is stored in a first memory. It is memorized in the means. And when the registration request signal is received from any of the first call terminals, and the second call terminal different from the first call terminal that transmitted the registration request signal is not registered in the registration list, The first call terminal that has transmitted the registration request signal is registered in the registration list. On the other hand, if the second call terminal is already registered in the registration list, the first call terminal that has transmitted the registration request signal is not registered in the registration list.
As described above, when registration request signals are received from a plurality of call terminals having the same identification information, the call terminals previously registered in the registration list are preferentially left in the registration list to allow the call. As a result, it is possible to prevent a call terminal that has transmitted a registration request signal later from being registered as a call terminal that permits a call. Therefore, it is possible to prevent a problem that the terminals that are allowed to talk are changed one after another.
Further, the second registration control means, when setting information permitting registration in the registration list is stored in the second storage means, other call terminals already assigned the same identification information are included in the registration list. Even if registered, the first call terminal that has transmitted the registration request signal is registered in the registration list. This makes it possible to register the call terminal that has transmitted the registration request signal later in the registration list.

Further, in the communication control device of the invention according to claim 3 , in addition to the effect of the invention of claim 1 or 2, when the call terminal registered in the registration list is busy, The call terminal is not forcibly deleted from the registration list, and the call state is continuously maintained. A call terminal that has transmitted a registration request signal later does not register it in the registration list and does not allow the call. Thereby, it is possible to prevent the call of the call terminal from being cut off in the middle.

In addition, in the communication control device of the invention according to claim 4 , in addition to the effect of the invention according to claim 3 , the previously registered second call terminal is busy and wants to be registered in the registration list. When the first call terminal is not registered in the registration list, a call notification signal notifying that the first call terminal is not registered in the registration list is transmitted to the first call terminal that has transmitted the registration request signal. This makes it possible for the first call terminal that has received the busy notification signal to recognize that the reason for not being registered in the registration list is due to the presence of the second call terminal that is on the call.

Further, in the communication control device of the invention according to claim 5 , in addition to the effect of the invention of claim 1 or 2 , when the second call terminal is busy, the first call terminal is registered in the registration list. Since the second call terminal is not deleted from the registration list, both the first call terminal and the second call terminal that have transmitted the registration request signal are registered in the registration list. As a result, the second call terminal that is in a call remains in the registration list and can continue a call. Therefore, it is possible to continuously execute a call without disconnecting the call state of the second call terminal halfway.

Further, in the communication control device according to the invention of claim 6 , in addition to the effect of the invention of claim 5 , the second call terminal is deleted from the registration list at the end of the call of the second call terminal. As a result, only the first call terminal is registered in the registration list, so that only the first call terminal can be recognized as a call terminal capable of making a call.

In addition, in the communication control device of the invention according to claim 7 , in addition to the effect of the invention of claim 1 or 2 , a plurality of call terminals to which the same identification information is assigned are simultaneously registered in the registration list. In the state, when a call request signal addressed to this identification information is received, the call request signal is transferred to the call terminal (second call terminal) previously registered in the registration list. As a result, the user of the call terminal can make a call by preferentially using the call terminal previously registered in the registration list.

In addition, in the communication control device of the invention according to claim 8 , in addition to the effect of claim 1 or 2 , a plurality of call terminals to which the same identification information is assigned are registered in the registration list at the same time. When a call request signal is received from these call terminals, the call request signal is transferred to the call terminal of the call destination. Thus, the user of the call terminal can make a call using a plurality of call terminals.

Further, the communication control method of the invention according to claim 9 can achieve the same effect as that of claim 1.
Further, the communication control method of the invention according to claim 10 can achieve the same effect as that of claim 2.
The communication control program according to the eleventh aspect of the invention can achieve the same effects as those of the first aspect.
The communication control program according to the twelfth aspect of the invention can achieve the same effect as that of the second aspect.

1 is a schematic diagram showing an outline of a call system 1. FIG. 3 is a schematic diagram showing an electrical configuration of a communication control device 2. FIG. 2 is a schematic diagram showing an electrical configuration of a call terminal 10. FIG. It is a schematic diagram which shows an AOR list. It is a schematic diagram which shows a registration list. It is a flowchart which shows a registration request reception process. It is a flowchart which shows a registration list update process. It is a flowchart which shows a setting change process. It is a flowchart which shows a telephone call control process. It is a flowchart which shows a registration request transmission process. It is a flowchart which shows a calling process. It is a flowchart which shows an incoming call process. It is a flowchart which shows a post-registration setting process. It is a schematic diagram which shows the setting screen at the time of post-registration setting. It is a flowchart which shows the registration request reception process in a modification.

  Hereinafter, a communication control apparatus 2 embodying a communication control apparatus according to the present invention will be described with reference to the drawings. These drawings are used for explaining technical features that can be adopted by the present invention, and there are no specific descriptions in the devices, terminal configurations, flowcharts of various processes, and the like. As long as it is not limited to that, it is merely an illustrative example.

  First, the outline of the call system 1 including the communication control device 2 will be described with reference to FIG. As shown in FIG. 1, the call system 1 includes a mobile call terminal 11, a mobile call terminal 12, a PC 13, a PC 14, and a communication control device 2 connected to the Internet 3. The mobile call terminal 11 is owned by the user 4. The mobile call terminal 12 and the PC 13 are owned by the user 5. The PC 14 is owned by the user 6.

  The mobile call terminal 11, the mobile call terminal 12, the PC 13, and the PC 14 will be described. The mobile call terminal 11, the mobile call terminal 12, the PC 13, and the PC 14 all communicate with other terminals (mobile call terminals and PCs) via the Internet 3 to execute a call between terminal owners ( IP telephone function) at least. The mobile phone terminals 11 and 12 are connected to the Internet 3 by performing wireless communication with an access point (not shown) connected to the Internet 3. As the mobile call terminals 11 and 12, for example, a wireless IP phone can be used. The PCs 13 and 14 are directly connected to the Internet 3. Hereinafter, the mobile call terminal 11, the mobile call terminal 12, the PC 13, and the PC 14 are collectively referred to as “call terminal 10”. In the call terminal 10, SIP (Session Initiation Protocol) is used as a call control protocol for realizing the IP telephone function.

  Identification information for identifying the user is assigned to each of the call terminals 10. In SIP, “SIP address” corresponds to identification information. The user can make a call with a specific user by designating the SIP address and calling the call terminal 10 of the specific user. In the example illustrated in FIG. 1, the SIP address “hanako@hoge.co.jp” is assigned to the mobile call terminal 11 (owned by the user 4). The SIP address “taro@hogehoge.co.jp” is assigned to the mobile phone terminal 12 and the PC 13 (both owned by the user 5). The SIP address “ichiro@hoge.co.jp” is assigned to the PC 14 (owned by the user 6).

  As shown in FIG. 1, a common SIP address “taro@hogehoge.co.jp” is assigned to the two call terminals 10 (mobile call terminal 12, PC 13) used by the user 5. . The user 5 can selectively use the call terminal to which the common SIP address is assigned according to the situation. For example, when the user 5 is working toward the PC 13, the PC 13 is used as a call terminal to make a call. When the user 5 is working away from the PC 13, the mobile phone terminal 12 is used as a call terminal to make a call.

  The communication control device 2 will be described. The communication control device 2 functions as a SIP server in SIP. In the present embodiment, a register function and a proxy function will be described in detail among the functions of the communication control device 2 as the SIP server. However, the communication control device 2 has a configuration provided with other functions normally provided in the SIP server (a function for examining the destination of the other party's SIP UA (redirect function) and a function for managing information on the SIP UA (location function)). There may be.

  The register function provided in the communication control device 2 will be outlined. The call terminal 10 transmits a signal (hereinafter referred to as a “registration request signal (REGISTER)”) requesting registration to a registration list (see FIG. 5, details will be described later) included in the communication control device 2 to the communication control device 2. To do. When receiving the registration request signal (REGISTER), the communication control device 2 registers and manages the information on the call terminal 10 in the registration list. When receiving a call request between the call terminals 10 registered in the registration list, the communication terminal device 2 causes the call between the call terminals 10 to be executed. When a call request between call terminals 10 not registered in the registration list is accepted, the communication control device 2 does not execute a call between the communication terminals 10.

  The proxy function provided in the communication control device 2 will be outlined. The call terminal 10 transmits a signal for requesting the start of a call (hereinafter referred to as “call request (INVITE)”) to the communication control device 2. When the communication control device 2 receives the call request (INVITE), the communication control device 2 checks the IP address or the like of the destination call terminal 10 and transfers the received call request (INVITE) to the call terminal 10 that has checked the call request (INVITE). Thereafter, a signal transmitted from both call terminals 10 based on SIP is transferred to the other call terminal 10. When a predetermined series of communication procedures is completed in this way, a call can be made between the call terminals 10.

  Here, as shown in FIG. 1, when there are a plurality of call terminals 10 to which the same SIP address is assigned, the communication control device 2 may receive registration request signals (REGISTER) from both call terminals 10. . In the communication control device 2, in order to realize a call between the call terminals 10, the SIP address and the call terminal 10 must be associated with each other and stored in the registration list. In principle, the communication control apparatus 2 in the present embodiment preferentially registers the call terminal 10 that has transmitted the registration request signal (REGISTER) in the registration list.

  The electrical configuration of the communication control device 2 will be described with reference to FIG. As shown in FIG. 2, the communication control device 2 includes a CPU 21 that performs registration control of the call terminal 10 and call control between the call terminals 10, a ROM 22 that stores a boot program and BIOS, flag information, timer information, and a counter. A RAM 23 for temporarily storing information and the like, and a hard disk (hereinafter referred to as “HDD”) 28 for storing programs, registration information, setting information and the like are provided. The CPU 21, the ROM 22, the RAM 23, and the HDD 28 are electrically connected to each other. The CPU 21 can access the storage areas of the ROM 22, RAM 23, and HDD 28.

  The HDD 28 includes an address of record (hereinafter abbreviated as “AOR”) list storage area 281, a registration list storage area 282, and other areas. In the AOR list storage area 281, information related to the call terminal 10 that is permitted to be registered in the registration list is stored as an AOR list. The registration list storage area 282 stores the registration list described above. Details of the information stored in the AOR list storage area 281 and the registration list storage area 282 will be described later.

  The communication control device 2 includes a communication module 31 for connecting to the Internet 3 (see FIG. 1). The CPU 21 and the communication module 31 are electrically connected. The CPU 21 can transmit desired data to the Internet 3. Further, the CPU 21 can recognize data received from the Internet 3. A network card can be used as the communication module 31.

  The communication control device 2 includes a display driver 24 that can display an image on the display 25. The CPU 21 and the display driver 24 are electrically connected. The display driver 24 and the display 25 are electrically connected. The CPU 21 can display a desired image on the display 25.

  The communication control device 2 includes an input driver 26 that can detect information input by the user via the keyboard 27. The CPU 21 and the input driver 26 are electrically connected. The input driver 26 and the keyboard 27 are electrically connected. The CPU 21 can recognize information input via the keyboard 27.

  The communication control device 2 includes a CD-ROM drive 29 that can read information stored in the CD-ROM 30. The CPU 21 and the CD-ROM drive 29 are electrically connected. The CD-ROM 30 stores a program necessary for driving the CPU 21, for example. The CPU 21 can recognize information stored in the CD-ROM 30.

  With reference to FIG. 3, the electrical configuration of the call terminal 10 will be described. As shown in FIG. 3, the call terminal 10 includes a CPU 41 for executing a registration request to the communication control device 2 and communication control for a call, a ROM 42 for storing a program executed by the CPU 41, flag information and timer information. A RAM 43 in which counter information is temporarily stored, and a flash memory 44 in which image data to be displayed on a display 49 (described later), sound source data output from a speaker 46 (described later), and the like are stored. The CPU 41, the ROM 42, the RAM 43, and the flash memory 44 are electrically connected to each other. The CPU 41 can access storage areas of the ROM 42, RAM 43, and flash memory 44.

  The call terminal 10 includes a communication module 45 for connecting to the Internet 3 (see FIG. 1). The CPU 41 and the communication module 45 are electrically connected. The CPU 41 can transmit desired data to the Internet 3. The CPU 41 can recognize data received from the Internet 3. When the call terminal 10 is the mobile call terminal 11 and the mobile call terminal 12, an RF module can be used as the communication module 45. When the call terminal 10 is the PC 13 and the PC 14, a network card can be used as the communication module 45.

  The call terminal 10 includes a speaker 46 that outputs sound and a microphone 47 that inputs sound. The CPU 41, the speaker 46, and the microphone 47 are electrically connected to each other. The CPU 41 can output a desired sound from the speaker 46. The CPU 41 can recognize voice input via the microphone 47.

  The call terminal 10 includes a display 49 and a display driver 48 that can display an image on the display 49. The CPU 41 and the display driver 48 are electrically connected. The display driver 48 and the display 49 are electrically connected. The CPU 41 can display a desired image on the display 49.

  The call terminal 10 includes a keyboard 51 and an input driver 50 that can detect information input by the user via the keyboard 51. The CPU 41 and the input driver 50 are electrically connected. The input driver 50 and the keyboard 51 are electrically connected. The CPU 41 can recognize information input via the keyboard 51.

  The AOR list stored in the AOR list storage area 281 will be described with reference to FIG. As illustrated in FIG. 4, the AOR list stores information on an AOR-ID, a SIP address, a post-registration permission flag, and a retention period. Information registration in the AOR list is performed, for example, when a system administrator or the like performs an input operation via the keyboard 27 (see FIG. 2).

  AOR-ID is index information that is automatically added when information is stored in the AOR list. As the SIP address, the SIP address of the call terminal 10 permitted to be registered in the registration list is stored. As the post-registration permission flag, flag information indicating whether post-registration (details will be described later) is permitted is stored. FIG. 4 schematically illustrates “TRUE” when post-registration is permitted and “FALSE” when prohibited. Hereinafter, “TRUE” is stored in the “post-registration permission flag” that flag information for permitting post-registration is stored as the post-registration permission flag. The flag information prohibiting post-registration is stored as “FALSE” is stored in the post-registration permission flag. " The post-registration permission flag is switched by communication from the call terminal 10 and an input operation via the keyboard 27. In the initial state, “FALSE” is stored in the post-registration permission flag. As the holding period, the time for which the information of the call terminal 10 is held in the registration list is stored.

  In the example shown in FIG. 4, the mobile phone terminal 11 whose SIP address is “hanako@hoge.co.jp” (AOR-ID: 1) and the SIP address “taro@hogehoge.co.jp” (AOR-ID). : 2), the mobile call terminal 12 and the PC 13 and the PC 14 whose SIP address is “ichiro@hoge.co.jp” (AOR-ID: 3) are stored in the AOR list. Since “TRUE” is stored in the post-registration permission flag of the mobile phone terminal 11, post-registration is permitted. Since “FALSE” is stored in the post-registration permission flag of the mobile phone terminal 12, the PC 13, and the PC 14, post-registration is prohibited. Each holding period is 1800 s (AOR-ID: 1), 1000 s (AOR-ID: 2), and 1200 s (AOR-ID: 3).

  The registration list stored in the registration list recording area 282 will be described with reference to FIG. As shown in FIG. 5, the registration list stores information on ID, AOR-ID, Contact-URI, Call-ID, active flag, busy flag, holding period, and registration date and time. The ID is index information that is automatically added when information is stored in the registration list. As the AOR-ID, the AOR-ID added in the AOR list (see FIG. 4) to the call terminal 10 registered in the registration list is stored.

  Contact-URI is address information that is referred to in order to specify a transfer destination when the communication control device 2 transfers call data received from the call terminal 10 to another call terminal 10. The Contact-URI is obtained by adding “sip:” to the beginning of the SIP address of the call terminal 10 registered in the registration list and converting the domain name into the IP address.

  Call-ID is ID information added to data when communication is performed between the call terminals 10 or between the call terminals 10 and the communication control device 2. The Call-ID is added by the call terminal 10 when data is transmitted from the call terminal 10. The Call-ID is used to identify various data generated in a series of communications executed between a predetermined call terminal 10 or between the call terminal 10 and the communication control device 2 from data in other communication. Is.

  The active flag is flag information indicating whether registration information of the call terminal 10 registered in the registration list is valid or invalid (details will be described later). In FIG. 5, “TRUE” is schematically shown when the registration information of the registered call terminal 10 is valid, and “FALSE” is schematically shown when the registration information is invalid. Hereinafter, “TRUE” is stored in the active flag that flag information indicating that the registration information is valid is stored as an active flag. The flag information indicating that the registration information is invalid is stored as an active flag. “FALSE” is stored in the active flag. "

  The busy flag is flag information indicating whether or not the registered call terminal 10 is busy. In FIG. 5, “TRUE” is schematically shown when the call terminal 10 is busy, and “FALSE” is shown when the call is not busy. Hereinafter, flag information indicating that the call terminal 10 is busy is stored as a busy flag. “TRUE” is stored in the busy flag. The flag information indicating that the call is not in progress is stored as a busy flag. “FALSE” is stored in the busy flag. "

  As the holding period, a time for holding the registration information of the call terminal 10 in the registration list is stored. As the registration date and time, information on the reception date and time when a registration request signal (REGISTER) is received from the call terminal 10 is stored.

  In the example shown in FIG. 5, the mobile call terminal 11 (AOR-ID: 1) whose Contact-URI is “sip: hanako@192.0.2.4” is registered in the registration list. The Call-ID added to the data received from the mobile call terminal 11 is “841234@hoge.co.jp”. The registration information is valid (active flag: “TRUE”) and not in a call (busy flag: “FALSE”). The holding period of the mobile call terminal 11 is “1800 s”. The latest date and time when the registration request signal (REGISTER) is received from the mobile call terminal 11 is “December 18, 2008 10:01”.

  Processing executed by the CPU 21 of the communication control device 2 (registration request reception processing, registration list update processing, setting change processing, communication control processing) will be described with reference to FIGS. A predetermined priority order is set in advance for these processes. If any process is in the execution state and another process with a higher priority is the start timing, the process in the execution state is temporarily interrupted. Then, another process having a higher priority is executed instead. After the other processes having higher priorities finish executing, the suspended process resumes the process from the point of interruption. The priorities are set, for example, as “communication control process: 1”, “registration request reception process: 2”, “setting change process: 3”, “registration list update process: 4”. However, other settings may be used. The start timing of each process will be described below.

  First, the registration request reception process will be described with reference to FIG. In the registration request reception process, when the communication control device 2 receives a registration request signal (REGISTER) from the call terminal 10, the call terminal 10 (hereinafter referred to as "registration request terminal") that has transmitted the registration request signal (REGISTER) as necessary. ”) Is registered in the registration list. The registration request reception process is started and executed by the CPU 21 when the communication control device 2 is powered on.

  As shown in FIG. 6, in the registration request reception process, it is determined whether a registration request signal (REGISTER) transmitted from the registration request terminal is received (S11). If the registration request signal (REGISTER) has not been received (S11: NO), the process returns to S11, and reception of the registration request signal (REGISTER) is continuously monitored.

  When the registration request signal (REGISTER) is received (S11: YES), the registration list stored in the registration list storage area 282 of the HDD 28 is read (S13). Then, it is determined whether or not the call terminal 10 to which the same SIP address as that of the registration requesting terminal is assigned is already registered in the registration list (S15). Specifically, all AOR-IDs stored in the registration list are extracted. The AOR list stored in the AOR list storage area 281 of the HDD 28 is referred to, and the SIP address corresponding to the extracted AOR-ID is specified. The SIP address of the registration requesting terminal is specified from the information on the source SIP address included in the registration request signal (REGISTER). It is determined whether the SIP address identified from the AOR list includes the same SIP address as the SIP address of the registration requesting terminal identified from the registration request signal (REGISTER).

  When it is determined that the call terminal 10 having the same SIP address as that of the registration requesting terminal is not registered in the registration list (S15: NO), information necessary for registering the registration requesting terminal in the registration list is obtained. It is stored in the registration list (S17). Specifically, the AOR list stored in the AOR list storage area 281 of the HDD 28 is referred to identify the AOR-ID of the registration requesting terminal. The identified AOR-ID is stored in the registration list. “Sip:” is added to the head of the SIP address of the registration requesting terminal specified from the received registration request signal (REGISTER). The domain name portion of the SIP address is converted into an IP address. The Contact-URI obtained in this way is stored in the registration list. The Call-ID included in the registration request signal (REGISTER) is stored in the registration list. In order to indicate that the registration information stored in the registration list is valid, “TRUE” is stored as an active flag. In order to indicate that the registration requesting terminal is not busy, “FALSE” is stored as a busy flag. The holding period associated with the registration requesting terminal in the AOR list is stored as the holding period of the registration list. The date and time (registration date and time) when the registration request signal (REGISTER) is received is acquired and stored as the registration date and time. And it returns to S11 and the above-mentioned process is repeatedly performed.

  On the other hand, when it is determined that the call terminal 10 having the same SIP address as the SIP address of the registration requesting terminal is already registered in the registration list (S15: YES), the call terminal 10 having the same SIP address registered (hereinafter referred to as “SIP address”). It is determined whether or not “registered terminal” is the same terminal as the registration requesting terminal (S19). Whether or not the registered terminal and the registration requesting terminal are the same terminal is associated with the registered terminal in the registered list and the Call-ID included in the received registration request signal (REGISTER). This is done by comparing with Call-ID.

  If the Call-ID is the same (S19: YES), it is determined that the registered terminal and the registration requesting terminal are the same call terminal 10. In this case, the active flag associated with the registered terminal is then referred to in the registration list (S21). When “TRUE” is stored in the active flag (21: YES), a registration request signal (REGISTER) is received from the registration requesting terminal as information on the registration date and time associated with the registered terminal in the registration list. Date and time information is overwritten. Thereby, the registration information of the registration list is updated (S25). And it returns to S11 and the above-mentioned process is repeatedly performed.

  On the other hand, when “FALSE” is stored in the active flag associated with the registered terminal in the registration list (S21: NO), the registration information of the registered terminal is deleted (S23). And it returns to S11 and the above-mentioned process is repeatedly performed.

  If the Call-ID is different in S19 (S19: NO), it is determined whether the registration requesting terminal is allowed to be registered in the registration list (referred to as “post-registration”) instead of the registered terminal. (S27). When “FALSE” is stored in the post-registration permission flag associated with the registration requesting terminal in the AOR list (S27: NO), post-registration of the registration requesting terminal is prohibited. In this case, processing for registering the registration requesting terminal in the registration list is not performed. Therefore, a signal for notifying that the registration requesting terminal is not registered in the registration list (hereinafter referred to as “registration rejection signal”) is transmitted to the registration requesting terminal (S29). And it returns to S11 and the above-mentioned process is repeatedly performed.

  On the other hand, if “TRUE” is stored in the post-registration permission flag associated with the registration requesting terminal in the information of the AOR list (S27: YES), post-registration of the registration requesting terminal is permitted. In this case, a process for registering the registration requesting terminal in the registration list in place of the registered terminal is performed.

  First, it is determined whether the registered terminal is busy (S31). If “FALSE” is stored in the busy flag associated with the registered terminal in the registered list (S31: NO), the registered terminal is not busy. In this case, “FALSE” is stored in the active flag associated with the registered terminal in the registration list, and the registration information of the registered terminal is invalidated (S35). Next, the registration request terminal is registered in the registration list (S37). The registration method to the registration list is the same as the method in S17. And it returns to S11 and the above-mentioned process is repeatedly performed.

  Note that in the above description, the registration information in which “FALSE” is stored in the active flag associated with the registered terminal is stored in the registration list when a registration request signal (REGISTER) is received from the registered terminal in S11. It is deleted (S21: NO → S23).

  If “TRUE” is stored in the busy flag associated with the registered stacking terminal in the registration list (S31: YES), the registered terminal is busy. In this case, a signal for notifying that the registered terminal is busy and the registration requesting terminal is not registered (referred to as “calling notification signal”) is transmitted to the registration requesting terminal (S33). And it returns to S11 and the above-mentioned process is repeatedly performed.

  As described above, when registration request signals (REGISTER) are received from a plurality of call terminals 10 to which the same SIP address is assigned, in principle, the call terminals 10 previously registered in the registration list are preferentially registered. Remain on the list. Accordingly, it is possible to prevent the call terminal 10 that has transmitted the registration request signal (REGISTER) from being registered later as the call terminal 10 that executes the call when the call request signal is received. As a result, it is possible to prevent a problem that the terminals that are allowed to talk are changed one after another.

  Further, when the call terminal 10 that has received the registration request signal (REGISTER) is not registered in the registration list, a registration rejection signal is transmitted to the call terminal 10 and another call to which the same identification information is assigned. Notify that the terminal is already registered in the registration list. This makes it possible to notify the call terminal 10 that has transmitted a registration request signal (REGISTER) later, the reason for not being registered in the registration list.

  Even if post-registration is permitted, if the call terminal 10 previously registered in the registration list is in a call, the registration information of the call terminal 10 during the call is not invalidated, Continue to keep talking. As a result, it is possible to prevent the call of the call terminal 10 from being cut off halfway.

  Further, when the call terminal 10 previously registered in the registration list is in a call and the call terminal 10 that has transmitted a registration request signal (REGISTER) later is not registered in the registration list, the call terminal 10 can be called. Send a medium notification signal. This makes it possible to notify the call terminal 10 that has transmitted a registration request signal (REGISTER) later, the reason for not being registered in the registration list.

  The registration list update process will be described with reference to FIG. In the registration list update process, a process for monitoring a retention period of registration information stored in the registration list is performed at a constant cycle. When the elapsed time from the registration date to the current date exceeds the holding period, the corresponding registration information is deleted from the registration list. The registration list update process is started and executed by the CPU 21 at a predetermined cycle (for example, 1s cycle).

  As shown in FIG. 7, in the registration list update process, first, registration information of one call terminal is selected from the registration list (S41). Of the selected registration information, the retention period and the registration date and time are referred to. The time obtained by subtracting the registration date and time from the current date and time, that is, the elapsed time from the last reception of the registration request signal (REGISTER) from the registration request terminal is calculated. It is determined whether the calculated elapsed time exceeds the holding period (S43). If the elapsed time exceeds the retention period (S43: YES), the registration information is deleted from the registration list (S45). Then, the process proceeds to S47. If the elapsed time does not exceed the holding period (S43: NO), the registration information is not deleted and the process proceeds to S47.

  In S47, it is determined whether the above-described processing has been executed for all registration information in the registration list (S47). If registration information for which the above process has not been executed remains (S47: YES), the process returns to S41, and the above process is repeatedly executed for the remaining registration information. When the above-described processing is executed for all registration information (S47: NO), the registration list update processing is terminated.

  The setting change process will be described with reference to FIG. In the setting change process, a process for accepting a post-registration permission setting is performed. The setting change process is performed when a signal for setting permission / rejection of post-registration is received from the call terminal 10 or when an input operation for setting permission / rejection of post-registration is performed by the user via the keyboard 27. It is started and executed by the CPU 21.

  As shown in FIG. 8, when the setting change process is started, first, a signal for requesting permission for post-registration from the call terminal 10 requesting permission for post-registration (hereinafter referred to as “permission request signal”). Is received (S51). The permission request signal includes the SIP address of the source call terminal 10. When the permission request signal is received (S51: YES), the SIP address of the call terminal 10 that has transmitted the permission request signal is specified from the permission request signal. Then, the AOR list stored in the AOR list storage area 281 is referred to, and “TRUE” is stored in the registration permission flag after being associated with the same SIP address as the identified SIP address (S53). Next, a response signal for notifying that the post-registration is permitted is transmitted to the call terminal 10 that has transmitted the permission request signal (S55). Then, the setting change process ends.

  If the permission request signal has not been received (S51: NO), it is determined whether or not an input setting for permitting post-registration has been made by the user via the keyboard 27 (S57). Information specifying the call terminal 10 that permits post-registration is also input. When the input setting for permitting the post-registration is made (S57: YES), the AOR list stored in the AOR list storage area 281 is referred to and the post-registration associated with the call terminal 10 permitting the post-registration. “TRUE” is stored in the permission flag (S59). Then, the setting change process ends.

  When the input setting for permitting post-registration is not made (S57: NO), a signal for requesting prohibition of post-registration (hereinafter referred to as "prohibition request signal") from the call terminal 10 requesting prohibition of post-registration. .) Is determined (S61). The prohibition request signal includes the SIP address of the source call terminal 10. When the prohibition request signal is received (S61: YES), the SIP address of the call terminal 10 that has transmitted the prohibition request signal is specified from the prohibition request signal. Then, the AOR list storage area 281 is referred to, and “FALSE” is stored in the registration permission flag associated with the same SIP address as the identified SIP address (S63). Next, a response signal notifying that post-registration is prohibited is transmitted to the call terminal 10 that has transmitted the prohibition request signal (S65). Then, the setting change process ends.

  If the prohibition request signal has not been received (S61: NO), it is determined whether or not an input setting for prohibiting post-registration has been made by the user via the keyboard 27 (S67). Information specifying the call terminal 10 for which post-registration is prohibited is also input. When the input setting for prohibiting the post-registration is made (S67: YES), the AOR list stored in the AOR list storage area 281 is referred to and the post-registration associated with the call terminal 10 that prohibits the post-registration. “FALSE” is stored in the permission flag (S69). Then, the setting change process ends.

  When the input setting for prohibiting the post-registration is not made (S67: NO), the setting change process is terminated without performing any special process.

  As described above, post-registration can be permitted by the setting via the call terminal 10 or the setting via the keyboard 27. This makes it possible to invalidate the registration information of the call terminal previously registered in the registration list and register the call terminal that has transmitted the registration request signal (REGISTER) later in the registration list.

  The call control process will be described with reference to FIG. In the call control process, a call between the call terminals 10 registered in the registration list is executed based on the SIP. The call control process is started and executed by the CPU 21 when the communication control device 2 is powered on.

  As shown in FIG. 9, in the call control process, reception of a call request (INVITE) transmitted from the call terminal 10 (hereinafter referred to as “calling terminal”) that desires to start a call is monitored (S81). When the call request (INVITE) has not been received (S81: NO), the process returns to S81, and reception of the call request (INVITE) is continuously monitored.

  When a call request (INVITE) is received (S81: YES), registration of the calling terminal that has transmitted the call request (INVITE) and the call terminal 10 (hereinafter referred to as "calling terminal") of the call partner is performed. It is determined whether the information is stored in the registration list (S83). Specifically, the SIP URI of the calling terminal and the SIP URI of the called terminal included in the call request (INVITE) are referred to. Then, it is determined whether each SIP URI is stored in the registration list as a SIP URI. When the SIP URI of at least one of the calling terminal and the called terminal is not stored in the registration list (S83: NO), the call between the calling terminal and the called terminal is not started. Returning to the above, the above-described processing is continued.

  If the SIP URIs of both the calling side terminal and the called side terminal are stored in the registration list (S83: YES), is a state where a plurality of SIP URIs of the called side terminal are stored in the registration list? Is determined (S85). When a plurality of SIP URIs of the called terminal are stored in the registration list (S85: YES), the call terminal (registered terminal) previously registered in the registration list is the transfer destination terminal of the call request (INVITE) (S89). Among the plurality of registration information stored as the SIP URI of the called terminal, the call terminal 10 corresponding to the registration information in which “TRUE” is stored in the corresponding active flag is registered in the registration list first. This corresponds to a call terminal (transfer destination terminal). Then, the process proceeds to S91.

  On the other hand, when there is only one SIP URI of the called terminal registered in the registration list (S85: NO), only one called terminal is selected as the transfer destination terminal of the call request (INVITE) (S87). ). Next, the process proceeds to S91.

  In S91, the call request (INVITE) received from the calling terminal is transferred to the SIP URI of the called terminal selected as the transfer destination terminal (S91).

  After the call request (INVITE) is transferred to the called terminal, a ringing message transmitted from the called terminal is received. The received ringing is transferred to the calling terminal (S93).

  After “ringing” is transferred to the calling terminal, reception of a successful call (200 OK) transmitted from the called terminal is monitored (S95). If the call success (200 OK) has not been received (S95: NO), it is determined whether a rejection notification (486 BUSY HERE) has been received for notifying that the call has been rejected at the called terminal (S115). . When the rejection notification (486 BUSY HERE) is received (S115: YES), the received rejection notification (486 BUSY HERE) is transferred to the calling terminal (S117). Then, the process returns to S81 and the above-described processing is repeatedly executed. When the rejection notification (486 BUSY HERE) has not been received (S115: NO), the process returns to S95, and reception of the calling signal (200 OK) transmitted from the called terminal is continuously monitored.

  On the other hand, when the call success (200 OK) transmitted from the called terminal is received (S95: YES), the received call success (200 OK) is transferred to the calling terminal (S97). Next, an acknowledgment (ACK) transmitted from the calling terminal is received, and the received acknowledgment (ACK) is transferred to the called terminal (S99). Next, “TRUE” is stored in the busy flag corresponding to each of the calling terminal and the called terminal in the registration list stored in the registration list storage area 282 (S101).

  As a result, a call can be made between the calling terminal and the called terminal, so that the call is made between the calling terminal and the called terminal based on RTP (Real-time Transport protocol). Are executed (S139 (see FIG. 11), S169 (see FIG. 12), which will be described later).

  While a call is being executed between the calling side terminal and the called side terminal, it is monitored whether an end notification (BYE) transmitted from either the calling side terminal or the called side terminal is received. (S103). When an end notification (BYE) transmitted from any one of the call terminals 10 (calling side terminal or called side terminal) during a call is received (S103: YES), the received end notification (BYE) It is transferred to the previous call terminal 10 (S109). Then, the process proceeds to S111.

  In a state where the end notification (BYE) is not received from either the calling terminal or the called terminal (S103: NO), the information of the registration list stored in the registration list storage area 282 is referred to. Then, it is determined whether the registration information of the calling side terminal and the called side terminal is registered in the registration list (S105). When registration information of at least one of the calling side terminal and the called side terminal is deleted from the registration list (S105: NO), an end notification (BYE) is sent to both the calling side terminal and the called side terminal. Sent. As a result, the call between the calling terminal and the called terminal is terminated (S107). Then, the process proceeds to S111. When the calling side terminal and the called side terminal are registered in the registration list (S105: YES), the process returns to S103 and the above-described processing is repeatedly executed.

  In S111, an acknowledgment (ACK) transmitted from the calling terminal or the called terminal in response to the end notification (BYE) (S107, S109) transmitted to the calling terminal or the called terminal is received. Received. The received acknowledgment (ACK) is transferred to the call terminal 10 that is the call destination (S111). Next, “FALSE” is stored in the busy flag corresponding to each of the calling terminal and the called terminal in the registration list stored in the registration list storage area 282 (S113). Then, the process returns to S81 and the above-described processing is repeatedly executed.

  As described above, when a call request signal (call (INVITE)) addressed to a SIP address is received in a state where a plurality of call terminals 10 to which the same SIP address is assigned are simultaneously registered in the registration list, The call request signal (call (INVITE)) is transferred to the call terminal 10 previously registered in the registration list. As a result, the user of the call terminal 10 can make a call by preferentially using the call terminal 10 previously registered in the registration list.

  Even when a plurality of call terminals 10 to which the same SIP address is assigned are registered in the registration list at the same time, a call request signal (call (INVITE)) is received from these call terminals 10. Then, a call request signal (call (INVITE)) is transferred to the call terminal 10 of the call destination. As a result, the user of the call terminal 10 can make a call using a plurality of call terminals.

  The details of the processing (registration request transmission processing, outgoing call processing, incoming call processing, and post-registration setting processing) executed by the CPU 41 of the call terminal 10 will be described with reference to FIGS. A predetermined priority order is set in advance for these processes. If any process is in the execution state and another process with a higher priority is the start timing, the process in the execution state is temporarily interrupted. Then, another process having a higher priority is executed instead. After the other processes having higher priorities finish executing, the suspended process resumes the process from the point of interruption. The priorities are set, for example, as “calling process: 1”, “calling process: 2”, “registration request transmission process: 3”, and “post-registration setting process: 4”. However, other settings may be used. The start timing of each process will be described below.

  First, the registration request transmission process will be described with reference to FIG. In the registration request transmission process, a registration request signal (REGISTER) is transmitted to the communication control device 2 at a constant cycle (for example, 10 s). As a result, it registers itself in the registration list of the communication control device 2. The registration request transmission process is started and executed by the CPU 41 at a certain period when the power of the call terminal 10 is turned on.

  As shown in FIG. 10, when the registration request process is started, first, a registration request signal (REGISTER) is transmitted to the communication control device 2 (S121). Next, processing for receiving a signal transmitted from the communication control device 2 in accordance with the transmitted registration request signal (REGISTER) is executed. It is determined whether a registration rejection signal transmitted from the communication control device 2 has been received (S123). When it is determined that the registration rejection signal has been received (S123: YES), the display 49 is displayed to notify that the user is not registered in the registration list, and the user of the call terminal 10 is notified (S125). Then, the registration request transmission process ends.

  If the registration rejection signal has not been received (S123: NO), it is determined whether a call notification signal transmitted from the communication control device 2 has been received (S127). If it is determined that the in-call notification signal has been received (S127: YES), the presence of the call terminal 10 during a call is displayed on the display 49 to notify the user of the call terminal 10 (S129). Then, the registration request transmission process ends.

  When neither the registration rejection signal nor the busy notification signal is received from the communication control device 2 in response to the transmitted registration request signal (REGISTER) (S127: NO), a predetermined time for waiting for a response from the communication control device 2 It is determined whether the time has elapsed (S130). When the predetermined time has not elapsed (S130: NO), the process returns to S123, and the process of monitoring the reception of the registration rejection signal and the in-call notification signal is repeatedly executed. When a predetermined time for waiting for a response from the communication control device 2 has elapsed (S130: YES), the registration request signal processing is terminated.

  The calling process will be described with reference to FIG. In the calling process, a process for starting a call with another call terminal 10 by executing a call and executing the call is executed. The calling process is activated and executed by the CPU 41 when an operation for starting a call with the called terminal is performed by the user via the keyboard 51.

  As shown in FIG. 11, first, a call request (INVITE) designating the called terminal is transmitted to the called terminal via the communication control device 2 (S131). In response to the transmitted call request, ringing transmitted from the called terminal is received via the communication control device 2 (S133).

  After receiving “Ringing”, it is monitored whether the call success (200 OK) transmitted from the called terminal is received via the communication control device 2 (S135). In a state where the call success (200 OK) has not been received (S135: NO), it is monitored whether an input operation for terminating the call is performed via the keyboard 51 (S151). When an input operation for terminating the call is performed (S151: YES), an end notification (BYE) is transmitted to the called terminal via the communication control device 2 (S153). Next, an acknowledgment (ACK) transmitted from the called terminal is received via the communication control device 2 (S155). Then, the calling process is terminated.

  In a state where the input operation for ending the call is not performed (S151: NO), it is monitored whether a rejection notification (486 BUSY HERE) transmitted from the receiving terminal is received via the communication control device 2 ( S157). When the rejection notification (486 BUSY HERE) is received (S157: YES), an acknowledgment (ACK) is transmitted to the receiving terminal via the communication control device 2 (S159). Then, the calling process is terminated. On the other hand, when the rejection notification (486 BUSY HERE) has not been received (S157: NO), the process returns to S135, and the above-described processing is repeatedly performed.

  On the other hand, when the call success (200 OK) transmitted from the called side terminal is received via the communication control device 2 (S135: YES), the response confirmation is made to the called side terminal via the communication control device 2. (ACK) is transmitted (S137). Accordingly, since a call can be made with the called terminal, the call is executed with the called terminal based on RTP (S139).

  While a call is being made with the called terminal, it is monitored whether an input operation for terminating the call has been performed via the keyboard 51 (S141). When no input operation is performed (S141: NO), it is monitored whether an end notification (BYE) transmitted from the called terminal is received via the communication control device 2 (S147). When the end notification (BYE) is received (S147: YES), an acknowledgment (ACK) is transmitted to the called terminal via the communication control device 2 (S149). Then, the calling process is terminated. On the other hand, if the end notification (BYE) has not been received (S147: NO), the process returns to S141, and monitoring of the input operation via the keyboard 51 and the reception of the end notification (BYE) from the called terminal is continued. And executed.

  On the other hand, when an input operation for terminating the call is performed (S141: YES), an end notification (BYE) is transmitted to the called terminal via the communication control device 2 (S143). Next, an acknowledgment (ACK) transmitted from the called terminal is received via the communication control device 2 (S145). Then, the calling side process is terminated.

  The incoming call process will be described with reference to FIG. In the incoming call process, when there is a call start request from the calling side terminal, a process for starting a call with the calling side terminal and executing the call is executed. The incoming call processing is started and executed by the CPU 41 of the incoming call side terminal when a call request (INVITE) transmitted from the outgoing call side terminal is received.

  As shown in FIG. 12, when a call request (INVITE) is received and an incoming call process is started, first, a ringing (Ringing) message is transmitted to the calling terminal via the communication control device 2. (S161). Next, processing for notifying the user of an incoming call (output of incoming voice, display of incoming call notification screen, etc.) is executed. Then, it is monitored whether an input operation for receiving a call is performed by the user via the keyboard 51 (S163).

  In a state where an input operation for receiving an incoming call is not performed (S163: NO), it is monitored whether an input operation for rejecting a call is performed by the user via the keyboard 51 (S181). When an input operation for rejecting the call is performed (S181: YES), a rejection notification (486 BUSY HERE) is transmitted to the calling terminal via the communication control device 2 (S183). Next, an acknowledgment (ACK) transmitted from the called terminal is received via the communication control device 2 (S185). Then, the calling process is terminated. On the other hand, in the state where the input operation for rejecting the call is not performed (S181: NO), it is monitored whether the end notification (BYE) transmitted from the calling terminal is received via the communication control device 2 ( S187). When the end notification (BYE) is received (S187: YES), an acknowledgment (ACK) is transmitted to the called terminal via the communication control device 2 (S189). Then, the calling process is terminated. On the other hand, when the end notification (BYE) has not been received (S187: NO), the process returns to S163 and the above-described processing is repeatedly executed.

  On the other hand, when an input operation for receiving a call is performed by the user via the keyboard 51 (S163: YES), a call success (200 OK) is transmitted to the calling terminal via the communication control device 2. (S165). Next, an acknowledgment (ACK) transmitted from the calling terminal is received via the communication control device 2 (S167). Accordingly, since a call can be made with the calling terminal, the call is executed with the calling terminal based on RTP (S169).

  While a call is being performed with the calling terminal, it is monitored whether an input operation for ending the call is performed by the user via the keyboard 51 (S171). If no operation input is made (S171: NO), it is monitored whether an end notification (BYE) transmitted from the calling terminal is received via the communication control device 2 (S177). When the end notification (BYE) is received (S177: YES), an acknowledgment (ACK) is transmitted to the calling terminal via the communication control device 2 (S179). Then, the incoming call process is terminated. On the other hand, when the end notification (BYE) has not been received (S177: NO), the process returns to S171, and the input operation by the user and the reception of the end notification (BYE) from the calling terminal via the communication control device 2 are received. Monitoring is continuously executed.

  On the other hand, when an input operation for terminating the call is performed via the keyboard 51 (S171: YES), an end notification (BYE) is transmitted to the calling terminal via the communication control device 2. (S173). Next, an acknowledgment (ACK) transmitted from the calling terminal is received via the communication control device 2 (S175). Then, the calling side process is terminated.

  The post-registration setting process will be described with reference to FIG. In the post-registration setting process, a process for performing post-registration permission setting in the communication control device 2 via the call terminal 10 is executed. The post-registration setting process is activated and executed by the CPU 21 when it is detected that input settings for performing post-registration settings are made via the keyboard 51.

  As shown in FIG. 13, in the post-registration setting process, first, a setting screen for allowing the user to input post-registration settings is displayed on the display 49 (S191). An example of a screen displayed on the display 49 will be described with reference to FIG. As shown in FIG. 14, the setting screen includes a check box in which either “permitted” or “prohibited” post-registration can be set, an “OK” button for confirming the selected content, and selected content. A “cancel” button for canceling each is provided.

  When the user selects “permit” and presses the “OK” button on the screen displayed as shown in FIG. 14 (S193: YES), a permission request signal is transmitted to the communication control device 2. (S197). Then, after receiving a response signal returned from the communication control device 2 (S199), the post-registration setting process is terminated. The communication control device 2 permits post-registration of the call terminal 10 as the transmission source based on the transmitted permission request signal (S53, see FIG. 8).

  On the other hand, when “prohibit” is selected by the user and the “OK” button is pressed (S193: NO, S195: YES), a prohibition request signal is transmitted to the communication control device 2 (S198). Then, after receiving a response signal returned from the communication control device 2 (S199), the post-registration setting process is terminated. The communication control device 2 prohibits post-registration of the call terminal 10 as a transmission source based on the transmitted prohibition request signal (S63, see FIG. 8).

  As described above, in the communication control device 2, when receiving registration request signals (REGISTER) from a plurality of call terminals 10 having the same SIP address, in principle, the call terminals registered in the registration list first. Prioritize 10 to remain in the registration list and allow the call. As a result, it is possible to prevent the call terminal 10 that has transmitted a registration request signal (REGISTER) from being registered later as the call terminal 10 that permits the call, so that the terminals that are allowed to call are changed one after another. Problems can be prevented.

  Further, since post-registration is permitted by setting via the call terminal 10 and the keyboard 51, it is possible to prevent a problem that the call terminal 10 that has transmitted a registration request signal (REGISTER) later is not registered in the registration list. .

  The registration list storage area 282 of the HDD 28 in FIG. 2 corresponds to the “first storage unit” of the present invention. The SIP address corresponds to “identification information” of the present invention. The call request (INVITE) transmitted from the call terminal 10 corresponds to the “call request signal” of the present invention. A plurality of call terminals 10 (for example, the mobile call terminal 12 and the PC 13 in FIG. 1) to which the same SIP address is assigned correspond to the “first call terminal” of the present invention. Among the first call terminals, a call terminal (registered terminal) registered in the registration list corresponds to the “second call terminal” of the present invention. The CPU 21 that performs the process of S11 in FIG. 6 corresponds to the “first reception control unit” of the present invention, and the CPU 21 that performs the process of S17 corresponds to the “first registration control unit” of the present invention, and has the same Call-ID. If not (S19: NO), the CPU 21 performing the processing corresponds to the “second registration control means” of the present invention.

  The CPU 21 that performs the process of S29 in FIG. 6 corresponds to the “first transmission control means” of the present invention. The CPU 21 that performs the process of S51 in FIG. 8 corresponds to the “second reception control means” of the present invention. The AOR list storage area 281 of the HDD 28 in FIG. 2 in which the post-registration permission flag in FIG. 4 is stored corresponds to the “second storage means” of the present invention. The CPU 21 that performs the process of S31 in FIG. 6 corresponds to the “calling determination unit” of the present invention, and the CPU 21 that performs the process of S33 corresponds to the “second transmission control unit” of the present invention.

  9 corresponds to the “third reception control means” and “fourth reception control means” of the present invention, and the CPU 21 performing the process of S91 after S89 corresponds to the “third transmission control means” of the present invention. Is equivalent to. The CPU 21 that performs the processing of S91 after S87 corresponds to the “fourth transmission control means” of the present invention.

  The process of S11 in FIG. 6 corresponds to the “first reception control step” of the present invention, and the process of S17 corresponds to the “first registration control step” of the present invention. The process in the case of not being the same Call-ID (S19: NO) corresponds to the “second registration control step” of the present invention.

  In addition, this invention is not limited to the said embodiment, A various change is possible. In the above-described embodiment, when the post-registration is permitted and the registered terminal is busy, the registration request terminal is not registered in the registration list. However, the present invention is not limited to this. Therefore, for example, even if the registered terminal is busy, the registration request terminal may be registered in the registration list. Further, the registration information of the registered terminal may be left in the registration list until the call is finished and invalidated when the call is finished. Hereinafter, modifications of the present invention will be described.

  A registration request reception process according to a modification of the present invention will be described. The registration request reception process is excluded from the configuration of the communication system 1, the physical configuration and electrical configuration of the communication control device 2 and the call terminal 10, and various processes executed by the communication control device 2 and the call terminal 10. Since the processing is the same as that of the above-described embodiment, the description thereof is omitted. Also, description of the common processing part of the registration request reception process described above and the registration request reception process in the modification described below will be omitted or simplified.

  With reference to FIG. 15, registration request reception processing in a modification of the present embodiment will be described. The registration request reception process is started and executed by the CPU 21 in a state where the communication control device 2 is powered on.

  As shown in FIG. 15, in the registration request reception process, it is first determined whether a registration request signal (REGISTER) is received from the registration request terminal (S11). If the registration request signal (REGISTER) has not been received (S11: NO), the process returns to S11 to determine whether the registration request signal (REGISTER) has been received.

  When the registration request signal (REGISTER) is received (S11: YES), the registration list is read (S13). Then, it is determined whether the call terminal 10 having the same SIP address as the SIP address of the registration requesting terminal is already registered in the registration list (S15). When it is determined that it is not registered in the registration list (S15: NO), information necessary for registering the registration requesting terminal is stored in the registration list (S17). And it returns to S11 and the above-mentioned process is repeatedly performed.

  On the other hand, when it is determined that the call terminal 10 having the same SIP address as the SIP address of the registration requesting terminal is already registered in the registration list (S15: YES), the already registered terminal (registered terminal) is registered. It is determined whether it is the same as the requesting terminal. The Call-ID included in the received registration request signal (REGISTER) is compared with the Call-ID associated with the registered terminal in the registration list. When both Call-IDs are the same and it is determined that the registered terminal and the registration requesting terminal are the same call terminal 10 (S19: YES), the active associated with the registered terminal in the registration list The flag is referenced (S21). When “TRUE” is stored in the active flag (S21: YES), the registration date and time associated with the registered terminal in the registration list is updated (S25). And it returns to S11 and the above-mentioned process is repeatedly performed. On the other hand, when “FALSE” is stored in the active flag associated with the registered terminal in the registration list (S21: NO), the registration information of the registered terminal is deleted (S23). And it returns to S11 and the above-mentioned process is repeatedly performed.

  In S19, when the Call-ID included in the registration request signal (REGISTER) is different from the Call-ID associated with the registered terminal in the registration list (S19: NO), the registration request terminal This means that the call terminal 10 is different from the registered terminal. In this case, first, it is determined whether or not post-registration is permitted (S27). In the AOR list, when “FALSE” is stored in the registration permission flag associated with the registration requesting terminal (S27: NO), the post-registration of the registration requesting terminal is prohibited. It is transmitted to the registration requesting terminal (S29). And it returns to S11 and the above-mentioned process is repeatedly performed.

  On the other hand, if “TRUE” is stored in the post-registration permission flag associated with the registration requesting terminal in the AOR list (S27: YES), the post-registration of the registration requesting terminal is permitted. Instead, a process for registering the registration requesting terminal in the registration list is performed.

  First, it is determined whether or not the registered terminal is busy (S221). If “FALSE” is stored in the busy flag associated with the registered terminal in the registered list (S221: NO), the registered terminal is not busy. In this case, the registered terminal does not correspond to the condition that the call is changed from the busy state to the call ended state (S225: NO). Therefore, “FALSE” is stored in the active flag associated with the registered terminal in the registration list, and the registration information of the registered terminal is invalidated (S229). Next, in order to register the registration requesting terminal in the registration list, necessary information is stored in the registration list (S231). And it returns to S11 and the above-mentioned process is repeated.

  On the other hand, if “TRUE” is stored in the busy flag associated with the registered terminal in the registration list (S221: YES), the registered terminal is busy. In such a case, necessary information is stored in the registration list in order to register the registration requesting terminal in the registration list (S223). And it returns to S11 and the above-mentioned process is repeated.

  When the registration request signal (REGISTER) is periodically and repeatedly transmitted from the registration request terminal and the call at the registered terminal is terminated (S221: NO), the registered terminal is not in a call from a busy state. (S225: YES), “FALSE” is stored in the active flag associated with the registered terminal in the registration list (S227). As a result, the registration information of the registered terminal is invalidated. And it returns to S11 and the above-mentioned process is repeated.

  Note that in the above description, the registration information in which “FALSE” is stored in the active flag associated with the registered terminal is stored in the registration list when a registration request signal (REGISTER) is received from the registered terminal in S11. It is deleted (S21: NO → S23).

  As described above, in the communication control device 2 in the modified example, when the registered terminal is in a call state and the registration request signal (REGISTER) is received from the registration request terminal, the registration request terminal is registered in the registration list. . The registration information of the registered terminal during a call is not changed at all. Then, when the call of the registered terminal ends, the registration information of the registered terminal is invalidated and the registration information is deleted. As a result, the call state of the registered terminal can be continued, and when the call of the registered terminal is terminated, it is possible to immediately recognize only the registration requesting terminal as a call terminal capable of making a call.

  The CPU 21 that performs the process of S227 in FIG. 13 corresponds to the “third registration control unit” of the present invention.

DESCRIPTION OF SYMBOLS 1 Call system 2 Communication control apparatus 3 Internet 10 Call terminal 21 CPU
28 HDD
282 Registration list storage area

Claims (12)

A communication control device for controlling communication for a call between call terminals,
A registration list in which the call terminal is registered, and when a call request signal that is a signal for requesting a call is received from the registered call terminal, the call is executed, and the call terminal that is not registered A first storage means for storing the registration list for performing call control not to execute a call when a call request signal is received;
In the case where there are a plurality of first call terminals having the same identification information that is assigned to the call terminal in order to identify the call terminal, from at least one of the plurality of first call terminals A first reception control means for receiving a registration request signal which is a signal to be transmitted and requests registration to the registration list;
A case of receiving the registration request signal or sent out of the plurality of first call terminal at a first reception control means, the plurality of first call terminal, transmits the registration request signal The first call that has transmitted the registration request signal when a second call terminal that is a first call terminal different from the first call terminal is not registered in the registration list stored in the first storage means First registration control means for registering a terminal in the registration list;
Even when receiving the registration request signal or sent out of the first reception control means and said plurality of first copies talking terminal at said on stored the registration list in the first storage means the Second registration control means for prohibiting registration of the first call terminal that has transmitted the registration request signal in the registration list when two call terminals are registered ;
Second reception control means for receiving a permission request signal which is a signal transmitted from any of the plurality of first call terminals and requests registration permission to the registration list ; Prepared,
The second registration control means includes
When the registration request signal transmitted from the first call terminal that transmitted the permission request signal is received by the second reception control means, the first call terminal that transmitted the permission request signal is added to the registration list. A communication control apparatus that registers and then deletes the second call terminal from the registration list . A communication control device for controlling communication for a call between call terminals,
A registration list in which the call terminal is registered, and when a call request signal that is a signal for requesting a call is received from the registered call terminal, the call is executed, and the call terminal that is not registered A first storage means for storing the registration list for performing call control not to execute a call when a call request signal is received;
In the case where there are a plurality of first call terminals having the same identification information that is assigned to the call terminal in order to identify the call terminal, from at least one of the plurality of first call terminals A first reception control means for receiving a registration request signal which is a signal to be transmitted and requests registration to the registration list;
The first reception control unit receives the registration request signal transmitted from any of the plurality of first call terminals, and transmits the registration request signal from the plurality of first call terminals. The first call that has transmitted the registration request signal when a second call terminal that is a first call terminal different from the first call terminal is not registered in the registration list stored in the first storage means First registration control means for registering a terminal in the registration list;
When the registration request signal transmitted by any one of the plurality of first call terminals is received by the first reception control means, the second registration list stored in the first storage means A second registration control means for prohibiting registration of the first call terminal that has transmitted the registration request signal in the registration list when the call terminal is registered;
A second storage means for storing setting information on whether or not to permit registration in the registration list of the specific first call terminal;
The second registration control means includes
The second storage means stores setting information that permits registration of the specific first call terminal in the registration list, and the registration request signal is received from the specific first call terminal. In this case, the communication control apparatus is characterized in that the specific first call terminal is registered in the registration list, and then the second call terminal is deleted from the registration list. Comprising a mid-call judging means for judging whether or not the second call terminal is busy;
The second registration control means includes
If it is determined by the mid-call determination means that the second call terminal is busy, registration to the registration list of the first call terminal that has transmitted the registration request signal is not performed, and The communication control apparatus according to claim 1 or 2 , wherein the second call terminal is not deleted from the registration list. The registration request transmitted by the first receiving unit when one of the plurality of first calling terminals is transmitted when the second calling terminal determines that the second calling terminal is busy during the call When the signal is received, the registration request signal is transmitted to the registration request signal, which is a signal to notify that the second call terminal registered in the registration list is in a call and is not registered in the registration list The communication control apparatus according to claim 3 , further comprising second transmission control means for transmitting to the first call terminal. Comprising a mid-call judging means for judging whether or not the second call terminal is busy;
The second registration control means includes
If the second call terminal determines that the second call terminal is busy, the first call terminal that has transmitted the registration request signal is registered in the registration list, and the second call is determined. the communication control device according to claim 1 or 2, characterized in that does not perform deletion from the registration list of the terminal. While the first call terminal and the second call terminal that transmitted the registration request signal are registered in the registration list, the call determination unit determines that the call of the second call terminal has ended. 6. The communication control apparatus according to claim 5 , further comprising third registration control means for deleting the second call terminal for which the call has ended from the registration list. In the second registration control means, the first call terminal that has transmitted the registration request signal is registered in the registration list and the second call terminal is deleted from the registration list. A first call terminal that is different from the registered first call terminal and the second call terminal, and that is registered in the registration list from a third call terminal that is a call terminal registered in the registration list. A third reception control means for receiving the call request signal transmitted to the identification information assigned to the call terminal and the second call terminal;
When receiving the call request signal at the third reception control means, according to claim 1, characterized in that a third transmission control means for transmitting the call request signal to the second call terminal or communication control device according to 2. In the second registration control means, the registration list is registered between the time when the first call terminal that has transmitted the registration request signal is registered in the registration list and the time when the second call terminal is deleted from the registration list. A call request signal transmitted from at least one of the first call terminal and the second call terminal registered in the first call terminal, the call request signal for requesting a call with the other call terminal; Four reception control means;
When receiving the call request signal at the fourth reception control means, according to claim 1, characterized in that a fourth transmission control means for transmitting the call request signal to the other call terminals or communication control device according to 2. A communication control method for controlling communication for a call between call terminals,
In the case where there are a plurality of first call terminals having the same identification information that is assigned to the call terminal in order to identify the call terminal, from at least one of the plurality of first call terminals When a call request signal is transmitted that is a signal requesting a call from the registered call terminal, the call is executed and the call request signal is received from the unregistered call terminal A first reception control step of receiving a registration request signal, which is a signal for requesting registration in the registration list stored in the first storage means, in order to perform call control that does not cause a call to be performed,
When the registration request signal transmitted by any one of the plurality of first call terminals is received in the first reception control step , the registration request signal is transmitted among the plurality of first call terminals. The first call that has transmitted the registration request signal when a second call terminal that is a first call terminal different from the first call terminal is not registered in the registration list stored in the first storage means A first registration control step of registering a terminal in the registration list;
A case of receiving the registration request signal or sent out of the first reception control the plurality of first copies talking terminal, in step, said the stored the registration list in the first storage means the A second registration control step for prohibiting registration of the first call terminal that has transmitted the registration request signal in the registration list when two call terminals are registered ;
A second reception control step of receiving a permission request signal which is a signal transmitted from any of the plurality of first call terminals and which requests registration permission to the registration list ; Prepared,
The second registration control step includes
If the registration request signal transmitted from the first call terminal that transmitted the permission request signal in the second reception control step is received, the first call terminal that transmitted the permission request signal is added to the registration list. A communication control method comprising: registering and then deleting the second call terminal from the registration list .   A communication control method for controlling communication for a call between call terminals,
  In the case where there are a plurality of first call terminals having the same identification information that is assigned to the call terminal in order to identify the call terminal, from at least one of the plurality of first call terminals When a call request signal is transmitted that is a signal requesting a call from the registered call terminal, the call is executed and the call request signal is received from the unregistered call terminal A first reception control step of receiving a registration request signal, which is a signal for requesting registration in the registration list stored in the first storage means, in order to perform call control that does not cause a call to be performed,
  When the registration request signal transmitted by any one of the plurality of first call terminals is received in the first reception control step, the registration request signal is transmitted among the plurality of first call terminals. The first call that has transmitted the registration request signal when a second call terminal that is a first call terminal different from the first call terminal is not registered in the registration list stored in the first storage means A first registration control step of registering a terminal in the registration list;
  In the first reception control step, when the registration request signal transmitted by any one of the plurality of first call terminals is received, the registration list stored in the first storage means stores the second A second registration control step for prohibiting registration of the first call terminal that has transmitted the registration request signal in the registration list when the call terminal is registered;
With
  The second registration control step includes
  Setting information for permitting the registration of the specific first call terminal to the registration list is stored in the second storage means for storing the setting information on whether or not the specific first call terminal is registered in the registration list. If the registration request signal is received from the specific first call terminal, the specific first call terminal is registered in the registration list, and then the second call terminal is A communication control method comprising deleting from a registration list.   A communication control program for controlling communication for a call between call terminals,
  In the case where there are a plurality of first call terminals having the same identification information that is assigned to the call terminal in order to identify the call terminal, from at least one of the plurality of first call terminals When a call request signal is transmitted that is a signal requesting a call from the registered call terminal, the call is executed and the call request signal is received from the unregistered call terminal A first reception control step of receiving a registration request signal, which is a signal for requesting registration in the registration list stored in the first storage means, in order to perform call control that does not cause a call to be performed,
  When the registration request signal transmitted by any one of the plurality of first call terminals is received in the first reception control step, the registration request signal is transmitted among the plurality of first call terminals. The first call that has transmitted the registration request signal when a second call terminal that is a first call terminal different from the first call terminal is not registered in the registration list stored in the first storage means A first registration control step of registering a terminal in the registration list;
  In the first reception control step, when the registration request signal transmitted by any one of the plurality of first call terminals is received, the registration list stored in the first storage means stores the second A second registration control step for prohibiting registration of the first call terminal that has transmitted the registration request signal in the registration list when the call terminal is registered;
  A second reception control step of receiving a permission request signal which is a signal transmitted from any of the plurality of first call terminals and which requests registration permission to the registration list;
Is executed by the computer of the communication control device,
  The second registration control step includes
  If the registration request signal transmitted from the first call terminal that transmitted the permission request signal in the second reception control step is received, the first call terminal that transmitted the permission request signal is added to the registration list. A communication control program that registers and then deletes the second call terminal from the registration list.   A communication control program for controlling communication for a call between call terminals,
  In the case where there are a plurality of first call terminals having the same identification information that is assigned to the call terminal in order to identify the call terminal, from at least one of the plurality of first call terminals When a call request signal is transmitted that is a signal requesting a call from the registered call terminal, the call is executed and the call request signal is received from the unregistered call terminal A first reception control step of receiving a registration request signal, which is a signal for requesting registration in the registration list stored in the first storage means, in order to perform call control that does not cause a call to be performed,
  When the registration request signal transmitted by any one of the plurality of first call terminals is received in the first reception control step, the registration request signal is transmitted among the plurality of first call terminals. The first call that has transmitted the registration request signal when a second call terminal that is a first call terminal different from the first call terminal is not registered in the registration list stored in the first storage means A first registration control step of registering a terminal in the registration list;
  In the first reception control step, when the registration request signal transmitted by any one of the plurality of first call terminals is received, the registration list stored in the first storage means stores the second A second registration control step for prohibiting registration of the first call terminal that has transmitted the registration request signal in the registration list when the call terminal is registered;
Is executed by the computer of the communication control device,
  The second registration control step includes
  Setting information for permitting the registration of the specific first call terminal to the registration list is stored in the second storage means for storing the setting information on whether or not the specific first call terminal is registered in the registration list. If the registration request signal is received from the specific first call terminal, the specific first call terminal is registered in the registration list, and then the second call terminal is A communication control program for deleting from a registration list.

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