JP4037432B2 - Telephone exchange system, telephone exchange method, and telephone exchange program - Google Patents

Description

  The present invention provides a telephone that makes a call by configuring a call network between terminal devices (hereinafter referred to as terminals) such as a plurality of IP (Internet Protocol Address) telephone terminals without using a centralized system (relay exchange) such as a soft switch. The present invention relates to an exchange system, a telephone exchange method, and a telephone exchange program.

2. Description of the Related Art Conventionally, a technique for guaranteeing the consistency of data stored in a shared memory that stores information (shared data) that is provided in a group of a plurality of terminals and is shared between terminals in the group is known. Yes. Here, the shared memory exists as a shared storage area in each terminal, and the same shared data is stored in the group.
For example, Patent Literature 1 discloses a data sharing method that maintains the consistency of shared data stored in each terminal while reducing the processing load on a plurality of terminals.

According to the present invention, first, a group for sharing data is formed by a plurality of terminals connected to each other via a network.
When the basic data is updated in the basic data shared within the group and the shared data including the member data regarding each terminal in the group, the update information regarding the update is updated in accordance with a predetermined determination method. The data update terminal performs broadcast transmission to each terminal in the group.
In the shared data, the broadcast when updating the member data is performed by each terminal in the group, the window terminal, and the terminal monitoring other terminals (described in detail in the embodiment).

Each terminal transmits update information to the broadcast terminal, and the broadcast terminal broadcasts update information in the shared data to terminals that are members of the group.
Here, each terminal transmits the identification number corresponding to the update information to the broadcast terminal together with the update information. On the other hand, when the discrimination number is received together with the update information, the broadcast terminal broadcasts the update information using a discrimination number larger than the received discrimination number as a new discrimination number. However, at this time, the broadcast terminal compares the received discrimination number with the stored discrimination number, and transmits the broadcast when the received discrimination number is larger.

On the other hand, each terminal receives the update information and the new determination number, compares the new determination number with the stored determination number, and stores the newly received determination number. If the number is larger than the number, the shared data is updated by the update information. Therefore, it is possible to reduce the processing load of each terminal while maintaining the consistency of the shared data stored in each terminal.
JP 2001-331469 A

On the other hand, in recent years, IP telephone terminals using VoIP (Voice over IP) are becoming widespread. Routing processing between IP telephone terminals is mediated by a soft switch.
The soft switch holds a SIP (Session Initiation Protocol) URL (address database) of the IP telephone terminal to be managed, and each IP telephone terminal registers its own IP address by accessing the soft switch at the time of activation.
When calling the other party's IP phone terminal (incoming side) after registering the IP address, the originating IP phone terminal obtains the IP address of the other party's IP phone terminal from the SIP URL by accessing the soft switch. Send a request.

When the other party's IP telephone terminal responds to this request, voice communication is realized by starting data streaming directly between the calling and called IP telephone terminals without going through the soft switch. .
That is, in the soft switch, address registration processing to the SIP URL at the start / end of the IP phone terminal, connection connection control processing at the time of a call, response state monitoring processing of the other party's IP phone terminal at the time of a transfer call, etc. Processing is performed. As for address registration and terminal monitoring processing, parallel processing by software is performed for each request.

In this way, at present, a centralized system such as a soft switch is adopted to realize VoIP. The reason why the centralized system is used is that the communication service needs to be controlled in conjunction with the calling IP phone terminal and the called IP phone terminal.
That is, the centralized system manages the states of the IP telephone terminals on the calling side and the called side, and performs call processing linked to this (such as transferring the incoming call when the other party is busy). And it is indispensable to realize in the IP telephone terminal on the called side.

However, in the centralized system, when the services to be realized are advanced (conference phone, answering machine, hold transfer function), the contents of the call processing to be executed in conjunction with the IP telephone terminals on the calling side and the called side are increased. It becomes complicated.
Then, there is a problem that the software configuration becomes very complicated in order to realize each service at the same time.
In other words, in order for a centralized system to newly implement one service, it causes a significant performance degradation of the entire system and a problem that may occur in operation, and a great cost is required from development to equipment. For this reason, there is a problem that the demerits of the development cost and the operation cost become larger than the low cost merit of the IP telephone terminal by increasing the use efficiency of the network.

  On the other hand, in existing telephone exchanges etc., this centralized system is divided by the number of service users to solve the problem. In this case, how to link the newly divided systems? It becomes a problem whether it is realized, and has not yet solved the above-mentioned problem.

  The present invention has been made in consideration of such circumstances, and its object is to establish a call network between terminals such as a plurality of IP telephone terminals without using a centralized system (relay switch) such as a soft switch. It is an object of the present invention to provide a telephone exchange system, a telephone exchange method, and a telephone exchange program that can be configured to make a call.

  The telephone exchange system according to the present invention (1) includes a group consisting of one or a plurality of terminals in which a plurality of terminals connected to the network share terminal information including unique information of each terminal and communication information indicating a communication state. For each group, a shared storage area for storing the terminal information of all terminals belonging to the same group is provided in a plurality of terminals, and belongs to the group by the transition of the terminal state including the incorporation or withdrawal of the terminals. Each time the terminal information is changed, in order to synchronize the information in the shared storage area in each group, it has a network information sharing function that performs update control of the terminal information stored in the shared storage area, When each terminal performs call processing, the called party group detecting means for detecting whether the called party and the calling party belong to the same group, and the called party is the same as itself In the case of a loop, the in-group call destination terminal state detection means for detecting communication information of the call destination in the shared storage area in the group, and the call destination in the case where the call destination is a group different from the group to which the user belongs Inter-group incoming call that performs registration processing of its own terminal information in the shared storage area of the group to which the terminal belongs, is transferred to the called destination group, and detects communication information of the called destination in the shared storage area in this group It has a destination terminal state detection means, and a call processing means for executing a call process with the called terminal based on the detected communication information

  In the telephone exchange system of the present invention (2), when the intra-group call destination terminal state detection means and the inter-group call destination terminal state detection means detect that the call destination is idle from the communication information, The call processing means writes the incoming call information as communication information in the shared storage area of the group of the called terminal, and also writes the outgoing information as its own communication information, and the call processing means of the called terminal receives the incoming call Based on the information, mutual communication processing is performed by changing own communication information.

  In the telephone exchange system of the present invention (3), for each terminal in the shared storage area, the own terminal information storage area for writing its own terminal information and the communication state viewed from the other terminal are used as the terminal information by the other terminal. A state table including a receiving terminal information storage area to be written is provided.

  The telephone exchange system according to the present invention (4) is characterized in that for each terminal in the shared storage area, a member table is provided in which all terminals in the group to which the terminal belongs are associated with the address of the terminal. And

  In the telephone exchange system of the present invention (5), a call source terminal incorporates into a group of callee terminals in a call process, and a communication information field in a callee terminal information storage area of the callee terminal Calling processing is performed by writing reservation information as incoming call information.

  In the telephone exchange system of the present invention (6), the terminal that is the callee writes the information that is being reserved for the caller terminal in the communication information field in the call receiver information storage area of its own shared storage area. By detecting, it is detected that the device itself is in an incoming call reception state.

  The telephone exchange system of the present invention (7) is set in advance when writing information reserved as incoming information in the communication information column in the incoming terminal information storage area of the incoming side while the outgoing side is making an outgoing call. The call is disconnected if the information being reserved cannot be written a predetermined number of times.

  The telephone exchange system according to the present invention (8) determines the elapsed time of each of the own terminal information storage area and the incoming terminal information storage area in the shared storage area on the called side after the state transition of the calling process and the incoming call process. Both the caller side and the caller side are detected, and whether or not the call is disconnected is determined based on whether or not the difference in elapsed time exceeds a predetermined value.

  In the telephone switching system of the present invention (9), in the off-hook period during an incoming call, the elapsed time counted after the called party changes its own state and the elapsed time until the calling party changes to the off-hook state. And whether or not the call is disconnected is determined based on whether or not the difference in elapsed time exceeds a preset time.

  In the telephone exchange system of the present invention (10), when the called party refers to the state of the calling party in the communication information column in the receiving terminal information storage area of the shared storage area and detects that it is no longer in the state of a call to itself. The connection is cut off.

  In the telephone exchange system of the present invention (11), when information of a terminal remains in the shared storage unit when the terminal leaves the group, the information of the terminal from which the predetermined terminal has left the shared storage unit is deleted. It is characterized by.

  The telephone exchange system according to the present invention (12) is characterized in that the called party group detecting means performs a process of detecting an identification number of a group to which the called party belongs at the time of outgoing call processing.

  The telephone exchange system of the present invention (13) is characterized in that the called party group detecting means performs a predetermined calculation on the telephone number of the called party and obtains the group identification number as the calculation result.

  In the telephone exchange system of the present invention (14), the called party group detection means inquires of a terminal management server having a correspondence table of telephone numbers and group identification numbers, and obtains the group identification number as an inquiry result. It is characterized by.

  In the telephone exchange system of the present invention (15), the called party group detection means inquires of the other terminal in the group about the group number corresponding to the telephone number, and obtains the group identification number as the inquiry result. It is characterized by.

  In the telephone exchange system of the present invention (16), the called party group detecting means extracts and extracts the group number corresponding to the telephone number from the correspondence table between the telephone number and the group number stored in the shared storage unit. As a result, the identification number of the group is obtained.

  The telephone exchange system of the present invention (17) detects the change of the shared data stored in the shared storage area and synchronizes the stored contents in each shared storage area in order to synchronize the stored contents of each shared storage area in the group. A data change terminal for broadcasting is provided.

  The telephone exchange system according to the present invention (18) is characterized in that each time the data change terminal performs a broadcast process, the terminals in the group are sequentially set as the next data change terminal.

  The telephone exchange system of the present invention (19) is characterized in that each terminal reads data in the shared storage area of the data change terminal and synchronizes the shared storage area in response to the notification from the data change terminal.

  The telephone switching system according to the present invention (20) is a group of one or more terminals in which a plurality of terminals connected to a network share terminal information including communication information indicating unique information and communication status of each terminal. For each group, a shared storage area for storing the terminal information of all terminals belonging to the same group is provided in a plurality of terminals, and belongs to the group by the transition of the terminal state including the incorporation or withdrawal of the terminals. A telephone exchange method having a network information sharing function for performing update control of terminal information stored in the shared storage area in order to synchronize information in the shared storage area in each group every time the terminal information is changed The call destination group that detects whether the call destination and the call source belong to the same group when the call process is performed by each terminal. If the call destination is the same group as itself, the call destination terminal status detection process for detecting the call destination communication information in the shared storage area within the group, and the call destination belongs to If the group is different from the group to be called, the terminal information is registered in the shared storage area of the group to which the called terminal belongs and is transferred to the called group, and the incoming call in the shared storage area in this group is performed. An inter-group call destination terminal state detection process for detecting the previous communication information, and a call process process for executing a call process with the called terminal based on the detected communication information.

The telephone exchange system of the present invention (21) is a group consisting of one or a plurality of terminals in which a plurality of terminals connected to the network share terminal information including unique information of each terminal and communication information indicating a communication state. For each group, a shared storage area for storing the terminal information of all terminals belonging to the same group is provided in a plurality of terminals, and belongs to the group by the transition of the terminal state including the incorporation or withdrawal of the terminals. In order to synchronize the information in the shared storage area in each group whenever the terminal information is changed, the telephone exchange having a network information sharing process for performing update control of the terminal information stored in the shared storage area is made to the computer. The program to be executed, and when the call processing performed by each terminal performs the call processing, the called party and the caller itself belong to the same group. Call destination group detection processing for detecting whether or not, and when the call destination is the same group as itself, in-group call destination terminal state detection for detecting communication information of the call destination in the shared storage area in the group If the process and the called party are different from the group to which the callee belongs, the terminal information is registered in the shared storage area of the group to which the called terminal belongs, and transferred to the called group. The inter-group called-destination terminal state detecting process for detecting the communication information of the called party in the shared storage area in the group, and the call process with the called-destination terminal are executed based on the detected communication information. A computer executable program having call processing.
The terminal of the present invention (22) forms a group consisting of one or a plurality of terminals in which a plurality of terminals connected to the network share terminal information including unique information of each terminal and communication information indicating a communication state. For each group, a shared storage area for storing terminal information of all terminals belonging to the same group is provided in a plurality of terminals, and the terminal information belonging to the group by the transition of the terminal state including incorporation or withdrawal of the terminal Is a terminal used in a telephone exchange system having a network information sharing function for performing update control of terminal information stored in the shared storage area in order to synchronize information in the shared storage area in each group each time Yes, when performing call processing, the called party group detecting means for detecting whether or not the called party belongs to the same group, and the called party itself In the case of the same group, in-group call destination terminal state detection means for detecting communication information of the call destination in the shared storage area in the group, and in the case where the call destination is a group different from the group to which the call belongs, Inter-group arrival that performs registration processing of its own terminal information in the shared storage area of the group to which the previous terminal belongs, incorporates it into the called destination group, and detects communication information of the called destination in the shared storage area within this group It has a call destination terminal state detection means and a call processing means for executing a call process with a called terminal based on the detected communication information.

  As described above, according to the present invention, in each terminal (for example, an IP telephone terminal), the group number to which the terminal belongs is obtained from the telephone number of the terminal of the called party, and the called party is identified. Then, a line is connected (established) between the called terminal and the calling terminal (own terminal) and the call processing is executed. A telephone communication network using a communication network such as the Internet can be configured without using a relay switch such as a soft switch, and the entire network can be configured at low cost.

  Further, according to the present invention, in a terminal connected to the network, a group is formed by one or a plurality of terminals, so that data necessary for telephone communication in the shared storage area can be transmitted to the terminals belonging to the group. By appropriately controlling the number of terminals belonging to the group, it is possible to suppress a significant increase in the storage capacity of the shared storage area itself and to easily configure an IP telephone system.

As shown in FIG. 1, the telephone exchange system according to the present invention includes a plurality of terminals connected to a network forming a group, and a terminal composed of unique information and communication information of all terminals participating in (belonging to) the same group. A shared memory within the group is provided as a shared storage area for sharing information.
In addition, this shared storage area is provided in a plurality of terminals, and for example, is secured as a specific area in the storage units of all terminals.
The shared storage area is a different memory area that each terminal has, but when preset shared data shared between terminals in a group is stored and information of other terminals is read The information is read from the shared storage area of another terminal and written to its own shared storage area.
That is, the shared storage area is provided in the storage unit of each terminal, and stores shared data (member table, status table, etc., which will be described later) that needs to be shared regarding the call processing of each terminal in the group. Is defined as

The shared storage area is a group of terminal information (information indicating a terminal state, such as a member table or a state table) by a state transition (participation, transfer, withdrawal, failure, etc.) of a terminal belonging to the group by a network information sharing function. When the change is made, the terminal information of the corresponding terminal in the shared storage area (whether each terminal is communicable, for example, whether it is communicating with other terminals or not) And at least a member table indicating terminals belonging to the group), and a synchronization is taken in accordance with the changed contents.
Here, participation means that the terminal joins the group to become its own group, transfer means that a terminal that has already joined the group joins another group, and withdrawal leaves the group that joined or joined ( The failure indicates that the terminal has a failure in the function of performing communication.
The number of terminals that can belong to this group is determined from the range in which shared data is mutually read and written within a predetermined time, and the upper limit of the memory capacity secured as a shared storage area.

  Each of the above terminals is, for example, an IP telephone terminal, and detects whether the called party and the calling party belong to the same group from the input telephone number when performing call processing. An incoming call destination group state detection unit that detects communication information of an incoming call destination in a shared storage area in the group when the incoming call destination is the same group as the incoming call destination group detection unit; If the destination is a group different from the group to which it belongs, the terminal information is registered in the shared storage area of the group to which the called terminal belongs, and is transferred to the called group and shared within this group. An inter-group called-destination terminal state detecting unit that detects communication information of the called party in the storage area; and a call processing unit that executes a call process with the called terminal based on the detected communication information; have.

As a result, in the present invention, the call source terminal reads the communication information of the called party, that is, the call destination terminal from the shared storage area in its own storage unit without passing through the relay switch, thereby communicating the communication state. When it is detected that the call is ready, the call source terminal can perform call processing by changing its own communication state and the communication state of the called terminal.
Each caller terminal detects a callee terminal group from a telephone number of the callee terminal by a predetermined method (to be described later) by a callee group detection unit. When it is detected that the terminal does not belong to the same group, the call processing unit transfers it to the group to which the called terminal belongs.

As a result, in the present invention, since the calling terminal basically performs the above-described processing of the centralized system, there is a need for a centralized system that performs complicated connection processing for controlling call processing between a plurality of terminals. Disappear.
On the other hand, in the present invention, the total number of terminals participating in the entire communication service for performing call processing fluctuated by guaranteeing the performance of processing the communication information of the called terminal at each terminal serving as the calling source. Even in the case, it is always possible to guarantee a certain quality and performance for the call service.

Hereinafter, a telephone exchange system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of a network according to the embodiment.
In this figure, a plurality of terminals A1 to A6, B1 to B6, C1 to C6,... Connected to the network I are connected, and the plurality of terminals form a group, that is, the terminals A1 to A6 are group A. , Terminals B1 to B6 form group B, and terminals C1 to C6 form group C.

Here, each terminal (A1 to A6, B1 to B6, C1 to C6,...) Has a configuration shown in FIG. FIG. 2 is a block diagram illustrating a configuration example of each terminal according to an embodiment.
The call processing unit 1 responds to a state transition that occurs in the call processing, for example, a change in the terminal state including transfer, join, leave, etc. with respect to each group. The terminal state rewriting process of the caller (self) and the callee in the table is performed in synchronization with all the terminals (members) belonging to the group. A process of rewriting data in each shared storage area in synchronization with all terminals in the group in synchronization will be described in detail later.
The called party group detection unit 2 determines whether the called terminal belongs to the same group as the calling terminal, that is, the group to which the called terminal belongs Is detected from the telephone number assigned to the terminal, and the call processing unit 1 is notified.

When the callee group detection unit 2 detects that the callee group detection unit 2 belongs to the same group as the caller terminal itself, the callee group detection unit 2 The communication status of the called party terminal is detected by referring to the communication information of the called party stored in the shared storage area of the group to which the call belongs, and the call processing unit 1 is notified of whether or not the call is possible.
The inter-group called-destination terminal state detecting unit 4 detects that the called-destination group detecting unit 2 detects that the called-destination terminal belongs to a group different from the calling-source terminal itself. After joining the group to which the previous terminal belongs, the communication status of the called terminal is detected by referring to the communication information of the called destination stored in the shared storage area of the transferred group, and whether the call is possible Is notified to the call processing unit 1.

The storage unit 5 is provided for each terminal, stores programs and data necessary for control and calculation in each terminal, and a predetermined capacity area is shared data shared by terminals in the group (for example, This is reserved as a shared storage area in the present embodiment for storing data such as a status table and a member table that need to be always synchronized when all terminals perform call processing.
The shared function unit 6 is shared data stored in the shared storage area of the storage unit 5 in all terminals in the group in accordance with the transition of terminal information stored in the shared storage area of each terminal that is a member of the group. Synchronize certain terminal information.

Here, the synchronization in the shared storage area of each terminal in the group means that, as described above, communication between terminals that belong to the group (belongs to), that is, data necessary for call processing is shared data. Since the shared data having the same content needs to be stored between the terminals, the process of making the shared data stored in the shared storage area the same among the terminals belonging to the group is performed.
In addition, a terminal that is transferred to another group shares the shared data of the participating group with each terminal of the own group, and shares the transferred shared data of the other group with each terminal of the other group. .

At this time, the other terminals in the own group of the transferred terminal do not share the shared data of the other group, and the transferred terminal of the other group does not share the shared data of the own group of the transferred terminal.
That is, taking as an example the case where terminal A1 participating in group A joins group B, terminal A1 shares the status table and member table of group A with other terminals belonging to group A. And the transfer destination group B status table and member table are shared as shared data.
However, other terminals in the group A other than the terminal A1 do not share the shared data of the group B with the terminals belonging to the group B (including the incorporated terminal A1).
Further, terminals of group B (terminals participating in group B) other than the transferred terminal A1 do not share the shared data of group A.

<Destination group detection>
As described above, when the calling terminal A1 calls the called terminal B1, the calling terminal A1 inputs the telephone number of the called terminal and detects the called party group. The group identifies a group sharing the shared storage area in which the called terminal joins, and obtains a group number.
For the detection of the group to which the called terminal belongs, in the called party group detecting unit 2, any of the following methods may be used in the processing of the called group detecting unit 2.

A. The group number to which the terminal of the called party belongs is uniquely obtained by a predetermined calculation from the telephone number of the called party.
B. A dedicated server (for example, a group server) is inquired about the telephone number of the called party, and the group number of the called terminal is obtained as a search result.
This dedicated server manages all the groups in the system and has a group DB (database) of tables indicating the correspondence between each group number and the telephone number of a terminal (member) belonging to the group.

C. Asking other members of your group for the phone number of the called party, and if any member has been transferred to another group, they will also ask each member of the other group for the phone number. In this way, members inquire about the telephone numbers of other groups that are related to the group, and gradually gather information on the target telephone numbers.
However, if there are no groups to be collected and no group to which the telephone number belongs is detected at this time, all the groups in the system are managed, and the group DB of the table showing the correspondence between each group number and the member's telephone number A specific group having (database) (a group of dedicated servers in B) is inquired to obtain the group number to which the telephone number belongs.

If the specific group is inquired about the telephone number of the called party from the beginning, the inquiries will be concentrated from each member of the entire system, resulting in a heavy load and a reduction in system management processing efficiency.
For this reason, the process of searching for the telephone number of the callee of C causes the problem to be solved between the terminals as much as possible in the search for the group number of the group to which the telephone number belongs, and the load is concentrated on a specific group. It is set as the structure which suppresses.

D. As already mentioned, each group has one or more window terminals, which are specific terminals that send and receive data to and from other groups. This method uses window terminals. This is a method for detecting a group number of a group to which a telephone number belongs.
In other words, the shared storage area has a routing table that indicates the correspondence between the IDs, telephone numbers, and group numbers of window terminals of other groups with which each group is associated.
In each group, if the destination telephone number is not detected in the member table in the own group, the group terminal of the own group is requested to search for the group to which the telephone number belongs.

As a result, the window terminal notifies the telephone terminal of any of the other groups described in the routing table of the telephone number and requests a search for the called terminal.
At this time, the window terminal notifies the group server of the telephone number and accesses the request for searching for the IP address of the window terminal of the other group, and uses the obtained IP address for the other group. Access to the other terminal.
If the other group's window terminal does not have the requested telephone number in its own group, it further requests the next group window terminal for a telephone number search.
There are a plurality of the above-mentioned window terminals in the group, and the group server is notified of the window terminals to join, transfer to, and leave, that is, any of the window terminals that already exist in the group is a new window terminal for participation. Participation and transfer are notified to the group server, and any one of the terminal terminals remaining in the group notifies the withdrawal. Here, when a terminal joins a group in which no terminal exists, the terminal that first participates becomes a window terminal, and notifies the group server of its own participation.

Hereinafter, the group detection methods A to D will be sequentially described.
-A. Method of
This is a method for uniquely obtaining a group number from the number of the other party to be called by calculation.
a. The called party group detection unit 2 that directly calculates the telephone number calculates “telephone number ÷ N = group number” and outputs the calculation result as a group number.
A telephone number is divided by an arbitrary numerical value N set in advance to obtain a group number by calculation.
At this time, the telephone number and the numerical value N may be set so that the group number is an integer value in advance, or the result of division is rounded down to the integer value as the group number. It may be used.

b. Associating a part of the telephone number with the group number When the telephone number is “XXXX-YY”, as a method for identifying the group from the telephone number, the last two digits (YY) of the telephone number are used as a wild card part, In other words, it is conceivable to construct a telephone number system by associating a telephone number with a group number of an upper digit (XXXX) other than the last two digits of this telephone number.
Thus, the group number can be uniquely obtained by extracting the set higher digit from the input telephone number.

c. Correspondence table between telephone numbers and group numbers In this configuration, a correspondence table in which a group number is associated with a telephone number of a terminal belonging to the group indicated by the group number is set in the shared storage area.
Then, when a telephone number is input, the called party group detecting unit refers to the correspondence table and extracts and outputs a group number corresponding to the input telephone number.
Here, in the case of the telephone number “XXXX-YY”, as a method for identifying the group from the telephone number, the last two digits (YY) of the telephone number are used as a wild card part so that the telephone number and the group are linked. It is conceivable to construct a correspondence table between the numbers of higher digits (XXXX) other than the last two digits of the telephone number and the group number.

Specifically, for example, the last few digits of the phone number are used as wildcard locations, and groups are assigned to the phone numbers included in this (if the last two digits, 100 phone numbers from 00 to 99 are assigned to one phone number. Assign to group).
As a result, the called party group detection unit 2 shifts the telephone number to the right by associating the upper digits other than the lower two digits with the group number, and the lower third digit of the telephone number is changed to the first digit. By performing the following calculation, this numerical value is detected from the above correspondence table, and the corresponding group number is read out, so that the group number of the called party can be uniquely detected.

-B. Method of
For example, for each group number, a dedicated server dedicated to routing having a correspondence table showing a correspondence relationship with the telephone numbers of terminals belonging to this group number may be provided for each group or for a plurality of groups. .
The terminal outputs the telephone number of the called terminal to the dedicated server dedicated to routing, and requests a search for the group number of the group to which the called terminal belongs.
Thereby, the dedicated server reads the group number corresponding to the telephone number input from the terminal with reference to the stored correspondence table and notifies the terminal of the group number.

-C. Method of
For example, when each terminal searches for a group of telephone numbers of the called terminal, it transmits the telephone number of the called terminal to another terminal that is a member of its own group, and corresponds to this telephone number. Queries the group number.
At this time, for example, when the terminal A1 of the group A performs the group detection of the telephone number of the called party, if it detects that the member table does not exist in the intra-group member shared storage area, An inquiry is made to each terminal A2 to A5 in its own group, and a search for this telephone number is requested.

At this time, if the terminal A5 in the group A belongs to another group (group B), the member table of the in-group member shared storage area in which the terminal A5 shares the call destination telephone number with the group B Is detected, that is, the telephone numbers of the terminals in the group B are searched.
Here, when the terminal A5 detects that the destination telephone number exists in the group B member table, the terminal A5 notifies the terminal A1 of the detected group number.

On the other hand, when the terminal A5 detects in the group B member table that the destination telephone number does not exist, the terminal A5 notifies each terminal in the group B of the destination telephone number, and Make an inquiry.
At this time, if any of the terminals in the group B is transferred to another group, the terminal notifies the terminal A5 that the search is performed, and performs the same search process as the terminal A5 transferred to the group B. .

In addition, when each terminal in group B has not been transferred to another group, it notifies terminal A that it has not transferred, and terminal A5 has not transferred from all the terminals in group B. When the notification is received, the terminal A1 is notified that the group number to which the telephone number of the called party to be searched by the terminal A belongs cannot be searched.
When the terminal A1 receives a notification indicating that the group number search cannot be performed from all other terminals in its own group, the telephone number of all terminals existing in the system configured by each group and the telephone number The telephone number of the called party is notified to a specific group comprising terminals having a group management table indicating the correspondence relationship with the group number of the group to which the group belongs, and a search for the group number is requested.
Here, the specific group (a server group in which the telephone numbers and group numbers of all terminals in the system are managed) includes a group server that receives a notification when a terminal participates in each group. To obtain information on terminals participating in each group.

-D. Method of
As described above, when each terminal requests the window terminal to search for a group to which the telephone number of the called party belongs, the window terminal is connected to the window terminals of other groups within this group. From the routing table showing the correspondence with the phone number of the terminal, select the contact terminal of the other group to be inquired, inquire the group server for the IP address of the selected contact terminal of the other group, and obtain the IP address To access another group's window terminal and search for the group number to which the telephone number of the called terminal belongs.
That is, when the terminal A1 searches for the group to which the called telephone number belongs in the group A, the telephone number is notified to the terminal set as the window terminal, for example, the terminal A2, and the group number is requested. Do.

Upon receiving the request from the terminal A1, the terminal A2 selects, for example, the terminal B1 from the window terminal of the group B in the routing table, and transmits the telephone number of the selected terminal B1 to the group server. The IP address of the terminal B1 is obtained from the group server.
Then, the terminal A2 transmits the destination telephone number to the terminal B1, and requests detection of whether or not the terminal having the telephone number exists in the group B.
At this time, the terminal B1 refers to the member table, detects the presence or absence of the requested telephone number, and if it exists in the member table of its own group, it exists in the group B (that is, the group B (Group number) is notified to the terminal A2.

On the other hand, when the requested telephone number is not detected in the member table of its own group, the terminal B1 refers to the routing table stored in the shared storage area and searches for a group other than the group A, for example, the group C Is searched.
The terminal B1 selects, for example, the terminal C1 from the window terminal of the group C, transmits the telephone number of the selected terminal B1 to the group server, and obtains the IP address of the terminal C1 from the group server.
Then, the terminal B1 transmits the destination telephone number to the terminal C1, and requests detection of whether or not the terminal having the telephone number exists in the group C.
At this time, the terminal C1 refers to the member table, detects the presence or absence of the requested telephone number, and if the presence is detected in the member table of its own group, the terminal C1 notifies the terminal A2 that it exists in the group C Notification via B1.

<Synchronization processing of shared storage area in group>
In addition, the sharing function unit 6 can consider the following methods when synchronizing within a group.
a. Predetermined terminals broadcast and simultaneously rewrite terminal information shared within the same group In each group, one or more of the terminals constituting the group are set as data change terminals.
The data change terminal is associated with each group of shared storage areas, for example, divided areas obtained by dividing the state table and member table into a predetermined number. For example, when divided into seven divided areas consisting of six state tables and one member table that are shared data in the shared storage area, each data change terminal has a divided data for each divided area of the six state tables. It will be associated.
Broadcasting when updating member data in the member table is performed by each terminal in the group, the window terminal, and terminals monitoring other terminals (described in detail later).

Here, the division area is generated as a function of the application of the present embodiment, that is, the predetermined number as described above corresponding to the shared data capacity in the shared storage area in which the shared function unit 6 is preset in the group. It is divided into. Thereby, all of the terminals belonging to the group have the same divided area.
This is because the shared storage area is divided in capacity, and even if shared data is not written in the status table or member table, it is divided as a predetermined capacity division (common address range in the shared storage area). Is not recorded, it is recognized that there is no change in the shared data.

When a terminal joins a group, there is no terminal at first, and when the first terminal joins, there is only one terminal belonging to the group, so the application cannot download information in the group from outside. The terminal that participates first is designated as the window terminal by the group server, and itself is in charge of the data change terminals in all the divided areas of the shared storage area.
Thereafter, as the number of terminals increases, the number of terminals in the member table increases, so as described later, the responsibility of each divided area is changed by sequentially changing other terminals as data change terminals, and the terminals of the entire group The management of the data change is sequentially performed by sharing the operation of the data change terminal.

If each terminal is a calling terminal, the terminal rewrites the communication information I1 in the area corresponding to its own ID number in the state table, and the communication in the area corresponding to the ID number of the called terminal in the state table. Rewriting of the information I2 is requested to the data change terminal in charge of the divided area corresponding to each ID number.
If each terminal is a called terminal, each terminal requests the data change terminal in charge of the area of its own ID number to rewrite the communication information I1 in the area corresponding to its own ID number.
As a result, when the data change terminal is requested by each terminal to change the data in the area that it is in charge of, that is, when the change of the terminal information of the associated divided area is notified, The information in the divided area to be changed and the data to be changed are broadcast to each terminal, thereby synchronizing the data in the shared storage area of all the terminals in the group.

Each terminal in the group is notified in advance of the relationship between the data change terminal and the divided area associated with the data terminal.
For example, as an initial state, associating with the divided areas is performed in the order in which the terminal joins the group (the window terminal broadcasts this correspondence to each terminal). In addition, the ID of the terminal serving as the data update terminal and the information on the corresponding divided area are broadcast to each terminal in the group together with the changed data.
At this time, for example, the data update terminal sets a terminal to be the next data change terminal in the order of the member table.

b. Centralized management of shared data server in the group This centralized management of b is not a configuration in which there are a plurality of data changing terminals and changed to other terminals as in the above-mentioned a. The data change terminal is fixedly set and is in charge of all changes in the shared storage area.
Which terminal this data change terminal is is notified to each terminal in the group in advance as an ID number from the window terminal when joining the group.
If each terminal is a calling terminal, the terminal rewrites the communication information I1 in the area corresponding to its own ID number in the state table, and the communication in the area corresponding to the ID number of the called terminal in the state table. The data change terminal is requested to rewrite the information I2.
Each terminal requests the data change terminal to rewrite the communication information I1 in the area corresponding to its own ID number if it is a called terminal.
Thereby, the data change terminal broadcasts the changed data to each terminal in the group when requested from each terminal, that is, when the requested change of the terminal information is notified. Thus, the data in the shared storage area of all terminals in the group is synchronized.

c, Differential update of terminal information in the shared storage area of the terminal In each group, one or more of the terminals constituting the group are set as the latest data storage terminal having the latest data.
The latest data storage terminal is associated with each group's shared storage area, for example, each divided area obtained by dividing the state table into a predetermined number, similarly to the data change terminal in the synchronization processing of a. For example, when the state table in the shared storage area is divided into six divided areas, each of the six divided areas is associated as a set terminal.

Which division area each latest data storage terminal is in charge of is notified in advance to each terminal as data indicating the ID number of the latest data storage terminal and the position of the division area in charge (provisional latest data storage Terminal).
When any terminal in the group needs to rewrite the data item, for example, when rewriting the communication information of the called party in the status table as the calling source, Download the latest data item from the latest data storage terminal having the latest data item, rewrite the data, and the data indicating the rewritten divided area and that it has become the latest data storage terminal Notify all members who belong to the group.

<Group participation sequence>
Next, the call processing operation in the embodiment of the present invention will be sequentially described below with reference to the drawings.
First, the operation of joining a group sharing terminal state information (shared data) will be described. As shown in the conceptual diagram of FIG. 3, as the first operation in the call processing, the login process shown below in which terminal B1 participates by turning on power to group B configured by terminals B2 to B6 Is performed by the sharing function unit 6.
The operation of this participation process will be described with reference to the sequence diagram of FIG.
Since the application that performs the call sequence is started when the power is turned on or the application that performs the call sequence is started and the terminal B1 participates in the group B, the terminal B1 is connected to the group server by an IP address preset in the application Access and receive authentication of the authentication unit in the group server (login sequence L1).

An identification number unique to each terminal is stored in advance in the authentication unit of the group server by registration processing or the like, and the authentication process is performed by detecting the presence or absence of the identification number, and the terminal B1 that requests the authentication process is registered. If the terminal B1 is successfully authenticated, the process proceeds to the login sequence L2. On the other hand, if the terminal B1 is not registered, the authentication process is terminated and the login sequence (group joining process) is performed. Also ends.
Next, when authenticating the terminal B1, the authentication unit transmits the ID number of the terminal B1 used in the call sequence or the like to the terminal B1 (login sequence L2).
The ID number may be generated by a predetermined method by authenticating even information previously set corresponding to the identification number.

In each group, a window terminal, which is a dedicated terminal for transmitting / receiving data to / from the outside, which is set in the order of participation in the group, is provided. The number of window terminals in the group is set to a predetermined number (for example, 3) in advance, and when the window terminal leaves or breaks down, it is changed to another terminal in the group (set in the order of joining the group) Is done.
The group server stores a window terminal table indicating the correspondence between the group number of each group, the window terminal provided for each group, and the IP address of the window terminal as a window terminal table.
The terminal B1 notifies its own ID number and IP address to the group server, and makes a participation request for the group B (login sequence L3).
As a result, the download unit of the group server refers to the window terminal table and requests the terminal B5, which is the window terminal, to execute the download processing of the shared information stored in the shared storage area of the group B. To do. (Login sequence L4)

For example, in FIG. 3, the terminal B5 is registered in advance in the group server as the window terminal at this time. The window terminal determination method is set by the group server in the order of participation in the group, for example.
That is, the group server selects one or a plurality of terminals that make a request for participation in each group in the order of arrival, uses the selected terminal as a window terminal, and associates the ID number of the window terminal with the group number indicating the group. And IP addresses are stored in groups.

Therefore, the group server transmits the IP address of the terminal B5 that is the window terminal to the terminal B1.
At this time, the member table of the shared storage area in each terminal belonging to the group B corresponds to the ID number of each of the group members, that is, the terminals (terminals B2 to B5) constituting the group. The correspondence relationship between the IP address and the port number (TCP or UDP port) used for communication is stored.

For example, as shown in FIG. 3, the status table has a configuration for each terminal in the status table. As the status information of the own terminal, information on the own terminal (elapsed time T1, communication information I1), and Information (elapsed time T2, communication information I2), and this configuration generates terminal information of all members of the group for each ID number, and all terminals each generate an application for each storage unit by starting an application. Stored in the shared storage area.
That is, each terminal includes a state table in which state information of all terminals that are members of the group to which the terminal belongs is described and stored in the respective shared storage areas, thereby maintaining the group unit. Shared data shared in the group (in this embodiment, at least a status table and a member table) is shared.

Then, the terminal B5 transmits the member table stored in the shared storage area of the group B and the state table template to the terminal B1 (login sequence L5).
Thereby, in the terminal B1, the sharing function unit 6 sets a predetermined portion of the storage unit 5 as a shared storage area, generates its own state table from the input state table template, and stores the member table. (Login sequence L6).

And as for the terminal B5 which is the window terminal, the member table is changed for each terminal (B1 to B4) in the group B because the member table is changed by newly joining the terminal B1. Notify that.
Next, each of the terminals B1 to B4 downloads the member table in which the terminal B1 is written from the terminal B5, overwrites the existing member table in the shared storage area, and adds a time stamp indicating the rewritten time. And update the member table.
Thereby, the participation of the terminal B1 in the group B ends, and the terminal B1 enters a standby state for an incoming call from the user or another terminal (login sequence L7).

<Call sequence within group>
Next, referring to FIG. 5, FIG. 6, and FIG. 7, a case where a terminal B1 (calling terminal) participating in group B makes a call to a terminal B2 (calling terminal) belonging to the same group B Will be explained. FIG. 5 is a state transition diagram of the terminal in the call processing, and FIGS. 6 and 7 are diagrams showing a call sequence showing the flow of the call processing. In the description of this process, the shared data synchronization process in the shared storage area will be described as an example using the method “a” in the “synchronization process of shared storage area in group”. In the description of this process, for example, in the group B, the window terminal is the terminal B5, and the data change terminals at this time are the terminal B2 and the terminal B4.

For example, the state table that is shared data is divided into a divided area Q1 composed of terminals B1, B2, and B3 with ID numbers and a divided area Q2 composed of terminals B4 and B5. The data change terminal is in charge of the area Q1, the terminal B5 is the data change terminal in charge of the divided area Q2, and is notified in advance to each terminal belonging to the group together with the assigned divided area. At this time, the terminal B5 is a window terminal and a data change terminal, and is also responsible for two processes.
In addition, as described above, in the shared storage area of each terminal, together with a member table in which personal information of terminals belonging to the group (terminal ID number (or ID), IP address, port number, etc.) is stored Then, a state table describing the terminal information (including communication information) of the own terminal for call processing monitoring is generated.

This state table includes an area of the own terminal to be written by the own terminal (own terminal information storage area to which communication information of own terminal information is written), and an elapsed time T1 after the terminal state transition in the calling process and the incoming call process And the communication information I1 (transmission information or incoming call information) of the own terminal, and the area of the incoming terminal written in the caller terminal (the incoming terminal when it becomes the called terminal) There is an information storage area), and an elapsed time T2 after the terminal state transition in the incoming call processing and communication information I2 (incoming call information) as an incoming terminal are written.
In the member table, a telephone number (or a terminal ID number, that is, an ID number may be used as a telephone number) which is unique information of each terminal, an IP address, a port number used for communication, etc. Is recorded.

In the on-hook state where the handset is lowered, the terminal B1 is in a standby state, and both the communication information I1 of the own terminal and the communication information I2 as the receiving terminal are “vacant” (calling (calling source) or incoming call (calling). It is recorded that both the elapsed time T1 and T2 are not described (step S1).
Next, when the user lifts the handset, the call processing unit 1 detects that the handset has been lifted (transition to the off-hook state), that is, the terminal B1 is in an “empty” state (incoming call ready state). ) To the “calling” state (calling state), and the synchronization processing for rewriting the communication information I1 of the own terminal from “empty” to “calling” is divided together with the ID number of the own terminal. A request is sent to the data change terminal B3 in charge of the area Q1.

Thereby, the data change terminal B3 rewrites the communication information I1 of the terminal table B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and each terminal (B1, B2, B4 , B5), the communication information I1 having the ID number B1 in the state table of the shared storage area is broadcasted to notify the user to execute the rewriting process from “empty” to “calling”.
At this time, the data change terminal B3 designates the terminal B4 in the next column of the member table as the data change terminal in charge of the next divided region Q1, and the next data change terminal is assigned to the terminals belonging to the group B. The ID number B4 of the terminal B4 and the information indicating the divided area Q1 that the terminal B4 is in charge of are broadcast together with the notification that prompts the execution of the rewriting process.
Each of the terminals B1, B2, B4, and B5 receives the above broadcast, thereby changing the communication information I1 of the ID number B1 of the state table in the shared storage area of its own storage unit from “empty” to “calling”. The group is synchronized with the change of the shared data of the data change terminal B3 within the group (step S2).

Then, when the user inputs the telephone number of the terminal B2, in the terminal B1, the called party group detection unit 2 uses the input telephone number of the terminal B2 to determine the group number B of the group to which the terminal B2 belongs. (This method of obtaining will be described in detail later), and the obtained group number is output to the call processing unit 1.
On the other hand, if the group number of the group to which the telephone number belongs cannot be detected by a method described later, the called party group detection unit 2 determines that the route detection is incomplete and advances the process to step S5.

Then, when a group number is input from the called party group detection unit 2, the call processing unit 1 confirms that the called party belongs to the same group B as the caller itself, based on the input group number. To detect.
As a result, the in-group call destination terminal state detection unit 3 reads the IP address and port number corresponding to the telephone number of the terminal B2 from the member table in the shared storage area, and accesses the terminal B2 (step S3). .

Next, the intra-group call destination terminal state detection unit 3 of the terminal B1 refers to the communication information I2 in the state table in the shared storage area of the terminal B2, and detects whether or not it is in “free” state.
Here, when the in-group call destination terminal state detection unit 3 of the terminal B1 detects that the communication information I2 is in the “vacant” state in the state table of the terminal B2, the call destination terminal B2 that is the counterpart is another It is detected that it is not in a talking state with the terminal in FIG. 1, but in a talking state, and the process proceeds to step S4 (step S3).

On the other hand, when the in-group call destination terminal state detection unit 3 of the terminal B1 detects that the communication information I2 is not in the “free” state in the state table of the terminal B2, the other party is in a call state with another terminal, It is detected that it is not in a call ready state, that is, in a “busy” state, and notifies the call processing unit 1 and advances the process to step S5 (step S3).
Thereby, the call processing unit 1 of the terminal B1 ends the call sequence processing and returns to the initial state (step S5).

Next, the call processing unit 1 of the terminal B1 performs a synchronization process for changing the communication state I1 in the state table of the storage unit 5 from the “calling” state to “reserving” together with the ID number of the terminal B1. The data change terminal B4 in charge of the divided area Q1 is requested for transmission.
Thereby, the data change terminal B4 rewrites the communication information I1 of the terminal table B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and each terminal (B1 to B3, B5). ), The communication information I1 whose ID number in the shared storage area state table is the terminal B1 is broadcast to notify the user to execute the rewriting process from “calling” to “reserving”.

At this time, the data change terminal B4 designates the terminal B5 in the next column of the member table as the data change terminal in charge of the next divided region Q1, and the next data change terminal is assigned to the terminals belonging to the group B. The ID number B5 of the terminal B5 and the information indicating the divided area Q1 that the terminal B5 is in charge of are broadcast together with the notification that prompts the execution of the rewriting process.
Each of the terminals B1 to B3 and B5 receives the above-mentioned broadcast, and changes the communication information I1 of the ID number B1 of the state table in the shared storage area of its own storage unit from “calling” to “reserving”. Rewrite and synchronization within the group with respect to the change of the shared data of the data change terminal B4.
At this time, the terminal B5 is designated as a data change terminal that is in charge of synchronizing data changes in the two divided areas Q1 and Q2.

Then, the in-group call destination terminal state detection unit 3 of the terminal B1 refers to the communication information I2 of the state table in the shared storage area of the terminal B2, and detects whether or not it is in the “free” state.
Here, when the in-group call destination terminal state detection unit 3 of the terminal B1 detects that the communication information I2 is “free” in the state table of the terminal B2, the terminal B2 reserves a call from another terminal. However, it is detected that a call reservation (that is, writing information during reservation for indicating reservation) is possible.
Next, the in-group call destination terminal state detection unit 3 of the terminal B1 rewrites the communication information I2 in the state table in the shared storage area of the terminal B2 from “free” state to “reserved”, that is, change of shared data A request is sent to the data changing terminal B5 that is in charge of the divided area Q2 together with the ID number of the own terminal.
As a result, the data change terminal B5 rewrites the communication information I2 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit at the request from the terminal B1, and also to each terminal (B1 to B4). On the other hand, the communication information I2 whose ID number in the shared storage area state table is the terminal B2 is broadcasted as a notification prompting the execution of the rewriting process from “available” to “reserved”.

At this time, the data change terminal B5 designates the terminal B1 in the next column of the member table, that is, the first column of the table, as the data change terminal in charge of the next divided area Q1, and makes the terminal belonging to the group B On the other hand, the ID number B1 of the terminal B5, which is the next data change terminal, and the information indicating the divided area Q1 that the terminal B1 is in charge of are broadcast together with the notification that prompts the execution of the rewriting process.
Then, each of the terminals B1 to B4 receives the broadcast, and rewrites the communication information I2 of the ID number B2 in the state table in the shared storage area of its own storage unit from “free” to “reserved”. The change in the shared data of the data change terminal B5 is synchronized within the group, and the process proceeds to step S6 (step S4).
At this time, the terminal B1 is a caller and is designated as a data change terminal in charge of synchronizing data changes in the divided area Q1.

On the other hand, when it is detected that the communication information I2 is not in the “free” state in the state table of the terminal B2, the in-group call destination terminal state detection unit 3 of the terminal B1 When B2 is accessed, the communication information I2 is referred to in the storage unit 5 of the terminal B2, and even if this is repeated a plurality of times (for example, five times), it is detected that the state does not transition to the “free” state. ”State, the process proceeds to step S5, and the call processing unit 1 is notified (step S4).
Thereby, the call processing unit 1 of the terminal B1 ends the call sequence processing and returns to the initial state (step S5).

That is, in step S5, the call processing unit 1 of the terminal B1 rewrites the communication information I1 in the state table in its own shared storage area from “reserved” to “free” state, that is, changes the shared data. Together with the ID number of the own terminal, the request is made to the data change terminal B1, which is in charge of the divided area Q2, that is, the own shared function unit 6.
As a result, the terminal B1, which is a data change terminal, rewrites the communication information I1 of the terminal B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from itself, and each terminal (B2 to B5) ), The communication information I1 whose ID number is in the shared storage area state table is broadcast to the communication information I1 of the terminal B1 from the “Reserved” state to the “Free” state.

At this time, the data change terminal B1 designates the terminal B2 in the next column of the member table as the data change terminal in charge of the next divided region Q1, and the next data change terminal is assigned to the terminals belonging to the group B. The ID number B2 of the terminal B2 and the information indicating the divided area Q1 that the terminal B2 is in charge of are broadcast together with the notification that prompts the execution of the rewriting process.
Each of the terminals B2 to B5 rewrites the communication information I1 with the ID number B1 in the state table in the shared storage area of its own storage unit from the “reserved” state to the “free” state by receiving the broadcast. Then, synchronization is made within the group with respect to the change of the shared data of the data change terminal B1 (step S5).

Next, the call processing unit 1 of the terminal B2 detects that the communication information I2 in the state table of its own shared storage area has changed (rewritten) from the “free” state to the “reserved” state, that is, When it is detected that another terminal is in an incoming call state, it performs a synchronization process for rewriting the communication state I1 in the state table from the “idle” state to the “incoming call ringing” state together with the ID number of the own terminal and takes charge of the divided area Q2. The data change terminal B2, that is, its own sharing function unit 6 is requested to transmit, and the elapsed time T1 is counted as a time stamp, and a ring tone such as a bell sound is output from the speaker. Notify users of this.
Thereby, the data change terminal B2 rewrites the communication information I1 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from itself, and each terminal (B1, B3 to B5) In response to this, a notification is sent to the communication information I1 whose ID number in the shared storage area state table is the terminal B2 for urging execution of the rewriting process from “free” to “incoming ringing”.

At this time, the data change terminal B2 designates the terminal B3 in the next column of the member table, that is, the first column of the table, as the data change terminal in charge of the next divided area Q1, and makes the terminal belonging to the group B On the other hand, the ID number B3 of the terminal B3, which is the next data change terminal, and information indicating the divided area Q1 that the terminal B3 is in charge of are broadcast together with a notification that prompts execution of the rewriting process.
Then, each of the terminals B1, B3 to B5 receives the broadcast, and changes the communication information I1 of the ID number B2 of the state table in the shared storage area of its own storage unit from “empty” to “incoming call”. Rewrite and synchronization within the group with respect to the change of the shared data of the data change terminal B2.
Here, since the process of synchronizing the change of the shared data shared within the group is the same as described above, the data change terminal change process will be described as a request for the synchronization process to the data change terminal. Will be omitted in the description.

Next, the call processing unit 1 of the terminal B2 starts counting the elapsed time T1, and then with respect to the elapsed time T1 in the state table of the shared storage area of the terminal B2 every predetermined time (at a constant cycle). Then, a synchronization process for writing the counted counting time is transmitted to the data change terminal in charge of the divided area Q2 together with the ID number of the own terminal and the counting time counted by itself.
As a result, the data change terminal rewrites the elapsed time T1 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and other terminals belonging to the group B ( Notification that prompts the terminal other than the data change terminal in the group B to execute the rewriting process in which the elapsed time T1 of the terminal B2 is the ID number in the state table of the shared storage area to the count time of the terminal B2 to be transmitted Broadcast.
Then, each broadcast terminal receives the broadcast, and rewrites the elapsed time T1 of the ID number B2 of the state table in the shared storage area of its own storage unit to the counting time of the terminal B2, and the data Synchronize within the group with respect to changes in the shared data of the changing terminal.

Similarly, when the call processing unit 1 of the terminal B1 detects that the communication state I1 in the state table of the shared storage area of the terminal B2 is “incoming call”, the elapsed time is used as a time stamp in the same manner as the terminal B2. The synchronization processing for writing the counted count time to the elapsed time T2 in the state table of the shared storage area of the terminal B2 is performed every predetermined time (at a constant cycle). Along with the counting time counted by itself, the request is sent to the data change terminal in charge of the divided area Q2.
Thereby, the data change terminal rewrites the elapsed time T2 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit at the request of the terminal B1, and other terminals belonging to the group B ( Notification that prompts the terminal other than the data change terminal in group B to execute the rewriting process with the elapsed time T2 of the terminal B2 being the ID number in the state table of the shared storage area to the count time of the terminal B1 to be transmitted To broadcast.
Each broadcasted terminal receives the above broadcast, and rewrites the elapsed time T2 of the ID number B2 of the state table in the shared storage area of its own storage unit to the counting time of the terminal B1. Synchronize within the group with respect to changes in shared data of the changing terminal

In addition, the call processing unit 1 of the terminal B1 performs a synchronization process for rewriting the communication state I1 in the state table of its own shared storage area from “reserved” to “calling” together with the ID number of the own terminal and the divided area Q2. Send to the data change terminal you are in charge of and request.
As a result, the data change terminal rewrites the communication information I1 of the terminal table B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and to each other terminal in the group Thus, the communication information I1 whose ID number in the shared storage area state table is the terminal B1 is broadcast to notify the user to execute the rewriting process from “Reserving” to “Calling”.
Then, each terminal belonging to the group B receives the above-mentioned broadcast, and changes the communication information I1 of the ID number B1 in the state table in the shared storage area of its own storage unit from “reserving” to “calling”. Synchronize within the group with respect to rewriting and changing data shared by data changing terminals.

Similarly, the call processing unit 1 of the terminal B1 performs the synchronization process of rewriting the communication state I2 in the state table of the shared storage area of the terminal B2 from “reserved” to “calling” together with the ID number of the own terminal. Send to the data change terminal in charge of Q2 and request.
Thereby, the data change terminal rewrites the communication information I1 of the state table in the shared storage area of its own storage unit with the request from the terminal B1, and the communication information I1 of the terminal B2, and other terminals in the group Thus, the communication information I2 whose ID number in the shared storage area state table is the terminal B2 is broadcasted to notify the user to execute the rewriting process from “Reserving” to “Calling”.

Then, each terminal belonging to the group B receives the above-mentioned broadcast, and changes the communication information I2 of the ID number B2 of the state table in the shared storage area of its own storage unit from “reserving” to “calling”. Synchronization is performed within the group with respect to the rewrite and the change of the shared data of the data change terminal (step S6).
At this time, the call processing unit 1 of the terminal B1 outputs a ringing tone from the speaker to notify the user that the calling is in progress.

In step S6, the call processing units 1 of the terminals B1 and B2 mutually transmit test packets to the communication path used for the call, that is, give a predetermined load to the communication path (predetermined amount). The communication state of the communication path is acquired by checking the elapsed time.
Thereby, the call processing units 1 of both the terminal B1 and the terminal B2 compare the elapsed time T1 and the elapsed time T2 in the state table of the shared storage area of the terminal B2 after a certain time has elapsed.
At this time, for example, when the communication processing unit 1 of the terminal B1 detects that the difference between the elapsed time T1 and the elapsed time T2 is a difference greater than or equal to a predetermined range (for example, 5 seconds), it determines that the connection is abnormal. The process proceeds to step S5.

Here, since the radio processing units 1 on both the calling side and the called side start to communicate voice, the load becomes large and the processing capacity of the hardware of the terminal is greatly reduced. In this case, information that can be communicated without difficulty is shared before the called party picks up the handset and is busy.
That is, the radio processing units 1 on both the calling side and the called side have a case where the elapsed time T1 and the elapsed time T2 are significantly different from each other, the traffic on the communication path is high, and voice communication cannot be performed. If it is determined that the communication state between the terminals is bad and it is impossible to perform the call process due to the system being down due to a load or the like, the process proceeds to step S5 and the call process is stopped.

Next, when the call processing unit 1 of the terminal B2 detects that the user picks up the handset (off-hook state), the communication information I1 in the state table of its own shared storage area is changed from “incoming call” to “incoming call”. A request is sent to the data change terminal in charge of the divided area Q2 together with the ID number of the terminal itself, and the elapsed time T1 is reset and newly set to “incoming call”. Start counting elapsed time since the state changed.
Thus, the data change terminal rewrites the communication information I1 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and to each other terminal in the group Thus, the communication information I1 with the ID number in the state table of the shared storage area of the terminal B2 is broadcasted as a notification prompting execution of rewriting processing from “incoming call” to “incoming call”.

Then, each terminal belonging to the group B receives the above-mentioned broadcast, and changes the communication information I1 of the ID number B2 in the state table in the shared storage area of its own storage unit from “incoming call” to “incoming call” Rewrite to “Medium”, and synchronize within the group to the change of the shared data of the data change terminal.
At this time, the call processing unit 1 of the terminal B2 stops the ringtone output from the speaker and notifies the user that the call is possible.
In addition, the call processing unit 1 of the terminal B2 is responsible for the divided area Q2 together with the ID number of its own terminal for the synchronous process of writing the time counted every predetermined time into the elapsed time T1 after starting a new counting Send it to the data change terminal you are requesting.

As a result, the data change terminal rewrites the elapsed time T1 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process to the elapsed time T1 of the terminal B2 with the ID number in the state table of the shared storage area being counted by the terminal B2 is broadcast.
Then, each terminal belonging to the group B receives the above broadcast, so that the time when the terminal B2 counts the elapsed time T1 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit. Synchronize within the group for changes to.

When the call processing unit 1 of the terminal B1 detects that the communication state I1 in the state table of the shared storage area of the terminal B2 has transitioned to “incoming call”, the call processing unit 1 sets the communication state I1 in the state table of its own shared storage area. A synchronous process for rewriting from “calling” to “busy” is requested by sending it to the data change terminal in charge of the divided area Q2 together with the ID number of the own terminal, and the state table of the shared storage area of the terminal B2 The elapsed time T2 is reset, and counting of the elapsed time since the state is newly changed to “busy” is started.
As a result, the data change terminal rewrites the communication state I1 of the terminal B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process from “calling” to “busy” is broadcast for the communication state I1 of the terminal B1 in the state table of the shared storage area.
Then, each terminal belonging to the group B receives the above broadcast, so that the ID number of the state table in the shared storage area of its own storage unit changes the communication information I1 of the terminal B1 from “calling” to “ Synchronize within the group to the change to "in call".

At this time, the call processing unit 1 of the terminal B1 stops the ringing tone output from the speaker, notifies the user that the call is ready (that is, the line is connected), and makes a call. Prompt.
In addition, the call processing unit 1 of the terminal B1 starts counting the elapsed time after the state is newly changed to “busy”, and then writes the time counted every predetermined time to the elapsed time T2. Is transmitted together with the ID number of the terminal itself to the data change terminal in charge of the divided area Q2.

As a result, the data change terminal rewrites the elapsed time T2 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and for each other terminal in the group Thus, a notification prompting the execution of the rewriting process to the elapsed time T2 of the terminal B2 whose ID number in the state table of the shared storage area is counted as the time counted by the terminal B1 is broadcast.
Then, each terminal belonging to the group B receives the above broadcast, so that the time when the terminal B1 counts the elapsed time T2 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit The group is synchronized with the change to (step S7).

  Also in step S7, as in the case of calling in step S6, the radio processing units 1 on both the calling side and the called side have different communication paths when the elapsed time T1 and the elapsed time T2 are significantly different. If the traffic is high and voice communication cannot be performed, or if one of the systems goes down due to a load, etc., the communication status between the terminals is bad and it is in a “failed” state, so it is impossible to continue the call processing. If it is determined that the call is possible, the call process is stopped, the process proceeds to step S5, and the call process is stopped.

Next, when the call processing unit 1 of the terminal B1 detects that the user has placed the handset on the terminal B1 (becomes ON hook state), the communication information I1 in the state table of its own shared storage area is A synchronization process for rewriting from “busy” to “reserving canceled (reserving canceled)” is transmitted to the data changing terminal in charge of the divided area Q2 together with the ID number of the own terminal and requested.
As a result, the data change terminal rewrites the communication state I1 of the terminal B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process from “busy” to “reserving canceled” is broadcast for the communication state I1 of the terminal B1 in the state table of the shared storage area.
Then, each terminal belonging to the group B receives the above broadcast, so that the ID number of the state table in the shared storage area of its own storage unit changes the communication information I1 of the terminal B1 from “busy” to “ Synchronize within the group for the change to “Reserving canceled”.

In addition, the call processing unit 1 of the terminal B1 performs a synchronization process for rewriting the communication information I2 in the state table of the shared storage area of the terminal B2 from the “busy” state to the “free” state together with the ID number of the own terminal. A request is sent to the data change terminal in charge of Q2, and the connection state (connected line) of access to terminal B2 is disconnected.
As a result, the data change terminal rewrites the communication state I2 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and to each other terminal in the group Thus, a notification prompting execution of the rewriting process from “busy” to “empty” is broadcast for the communication state I2 of the terminal B2 in the state table of the shared storage area.
Then, each terminal belonging to the group B receives the above broadcast, so that the ID number of the state table in the shared storage area of its storage unit changes the communication information I2 of the terminal B2 from “busy” to “ Synchronize within the group to the change to “empty”.

When the call processing unit 1 of the terminal B2 detects that the communication information I2 in the state table of its own shared storage area has changed from “busy” to “empty”, the call information I1 is changed from “busy”. A request for synchronization processing to be rewritten to "free" is sent to the data change terminal in charge of the divided area Q2 together with the ID number of the own terminal, and the connection state (connected line) of access to the terminal B1 is disconnected. (Step S8).
As a result, the data change terminal rewrites the communication state I1 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process from “incoming call” to “empty” is broadcast for the communication state I1 of the terminal B2 in the state table of the shared storage area.

Then, each terminal belonging to the group B receives the above-mentioned broadcast, so that the ID number of the state table in the shared storage area of its own storage unit changes the communication information I1 of the terminal B2 from “incoming call”. Synchronize within the group to the change to “free”.
At this time, the call processing unit 1 of the terminal B2 outputs a sound for notifying the line disconnection indicating that the call is ended from the speaker, and notifies the user that the access to the call is disconnected.
As a result, both terminal B1 and terminal B2 return to the standby state of step S0 (a state where both outgoing and incoming calls are possible).

<Call sequence between groups>
Next, a case where a terminal B1 (calling terminal) participating in group B makes a call to a terminal C2 (calling terminal) belonging to a different group C will be described with reference to FIGS. Will be explained. FIG. 5 is a state transition diagram of the terminal in the call processing, and FIGS. 6 and 7 are diagrams showing a call sequence showing the flow of the call processing.
Here, the difference from the case of making a call to the terminal B2 belonging to the same group already described is that the called party group detection unit 2 extracts the group number (group C) belonging to the telephone number of the terminal C2. This is a process and a process in which the terminal B1 joins the group C, and only this different process part will be described.

In the description of this process, the shared data synchronization process in the shared storage area will be described as an example using the method “a” in the “synchronization process of shared storage area in group”. In the description of this process, for example, the window terminal in the group B is the terminal B5, and the data change terminals at the first time are the terminals B2 and B4. On the other hand, the window terminal in the group C is the terminal C1, and the data change terminals at the first time are C2 and the terminal C4. Here, as for the data change terminal change process, the terminal in charge of the data change terminal changes in order of the member table for each broadcast process, as in the above-mentioned “call sequence within group”.
The process of synchronizing the change of shared data shared within this group is the same as the “call sequence within the group” already described. Therefore, the data change terminal is changed by requesting the data change terminal to perform the synchronization process. Processing will be omitted in the following description.

For example, in the group B in FIG. 9, the state table that is the shared data is divided into a divided region Q1 composed of terminals B1, B2, B3, and B4 having ID numbers, and a divided region Q2 composed of terminals B5, B6, B7, and B8. Tentatively, the terminal B3 is a data change terminal in charge of the divided area Q1, the terminal B5 is a data change terminal in charge of the divided area Q2, and each of the groups belonging to the group B together with the assigned divided area The terminal is notified in advance. In the group B, at this time, the terminal 5 is a window terminal and a data change terminal, and is also responsible for two processes.
Further, in the group C, the divided table R1 is composed of the terminals C1, C2, C3, and C4 whose status table is the shared data, the terminals C5, C6, C7, and C8, and the incorporated terminal B1. The terminal C3 is provisionally divided into the area R2, and the terminal C3 is provisionally the data change terminal responsible for the division area R1, and the terminal C5 is the data modification terminal responsible for the division area R2, and belongs to the group C together with the division area responsible. Each terminal is notified in advance.

In FIG.5, FIG.6 and FIG.7, when the callee group detection part 2 of the terminal B1 uses any of the group number detection methods A to D already explained, for example, the detection method A is used. The group number to which the called terminal belongs is uniquely obtained from the telephone number of the called terminal C2 by a predetermined calculation.
Then, in the terminal B1, the called party search unit 2 notifies the call processing unit 1 of the group number detected by the above-described processing (group C group number).
When the call processing unit 1 detects that the group to which the terminal C2 belongs is different from its own group based on the group number, the call processing unit 1 notifies the shared function unit 6 of the group number and the IP address. Instruct transfer to C.

Next, the sharing function unit 6 accesses the group server and transmits the group number of the detected group C.
Then, the group server searches for the IP address of the window terminal of group C based on the input group number, and transmits the searched IP address to the shared function unit 6.
As a result, the sharing function unit 6 accesses the input IP address and requests download of the member table.
Then, the window terminal of group C transmits its member table to the sharing function unit 6 of terminal B1 as a download process.

For example, in FIG. 9, it is assumed that the terminal C1 is registered in the group server as the window terminal at this time.
At this time, the member table of the shared storage area in the group C includes an IP address and a port number (TCP or UDP port) corresponding to the terminal ID number of each of the terminals C1 to C8 that are members in the group. Is remembered.
Similarly to the group B, the shared storage area also stores a state table indicating its own call state for each terminal.

Then, the sharing function unit 6 of the terminal B1 makes a transfer request to the group C by notifying the group server of the ID number and IP address of its own terminal.
Accordingly, the group server notifies the terminal C1 registered as the window terminal in the group C of the terminal ID number and the IP address of the terminal B1, and download information for the terminal B1 (between terminals in the group C). Request for transmission of shared data including member table).
Then, the terminal C1, which is the window terminal, transmits the download information in the group to the terminal B1 to perform the transfer process.

And the terminal table in the group C has a member table for each terminal (C2 to C8) in the group C because the member table is changed by the new participation of the terminal B1. Notify that it has changed.
Next, each terminal C2 to C8 downloads the member table written by the terminal B1 from the terminal C1, overwrites the existing member table in the shared storage area, and adds a time stamp indicating the rewritten time. And update the member table.

  Thereby, the transfer of the terminal B1 to the group C is completed, and the inter-group call destination terminal state detection unit 3 of the terminal B1 receives the IP address and port number corresponding to the telephone number of the terminal B2 from the member table in the shared storage area. And access to the terminal B2 (step S3). In the subsequent processing, since the called party is not a terminal in the same group, the communication state of the called terminal is not detected by the intra-group called terminal state detection unit 3 but the inter-group called terminal. Except for the state detection unit 4, the processing is the same as the processing after step S 4 in FIGS. 6 and 7.

At this time, the inter-group call destination terminal state detection unit 4 of the terminal B1 reads the IP address and port number corresponding to the telephone number of the terminal C2 from the member table in the shared storage area, and accesses the terminal C2 (step S3). .
Next, the inter-group called-destination terminal state detection unit 4 of the terminal B1 refers to the communication information I1 in the state table in the shared storage area of the terminal C2, and detects whether or not it is in the “free” state.

In addition, as a process of synchronizing the shared data in the group when the terminal B1 of the group B is transferred to the group C, the terminal B1 is shared by the group B when changing the communication information I1 in its state table. It is necessary to change both the state table in the shared storage area and the state table in the shared storage area shared by the group C in synchronization with each group.
That is, the terminal B1 transferred to the group C requests the data change terminal terminal of the group B to change the communication information I1 of the state table that is shared data shared by the group B, and shares it with the group C. Request the data change terminal of group C to change the communication information I1 in the state table, which is the shared data.

Thereby, the data change terminal of the group B rewrites the communication state I1 of the terminal B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and each other in the group A notification is sent to the terminal that prompts execution of a process in which the ID number in the state table of the shared storage area rewrites the communication state I1 of the terminal B1.
Then, each terminal belonging to the group B receives the above broadcast, whereby the ID number of the state table in the shared storage area of its own storage unit indicates the communication information I1 of the terminal B1, and the data change terminal of the group B Synchronize with changes.

Similarly, in response to a request from the terminal B1, the data change terminal of the group C rewrites the communication state I1 of the state table in the shared storage area of its own storage unit with the communication state I1 of the terminal B1, and A notification that prompts the terminal to execute a process in which the ID number in the state table of the shared storage area rewrites the communication state I1 of the terminal B1 is broadcast.
Then, each terminal belonging to the group C receives the above broadcast, whereby the ID number of the state table in the shared storage area of its own storage unit indicates the communication information I1 of the terminal B1, and the data change terminal of the group C. Synchronize with changes.

However, in step S8 at the end of the call, since the call processing unit 1 of the terminal B1 needs to leave the group C, it notifies the deletion of itself from the member table to all terminals in the group. .
In addition, the call processing unit 1 of the terminal B1 requests the data change terminal in charge of the divided area included in itself to delete the state table corresponding to its own ID number.

Thereby, each terminal of the member of the group C notifies the member table (corresponding to the broadcast notification of the leaving terminal itself) and the status table (corresponding to the broadcast notification from the data change terminal). The contents are changed to the data contents thus obtained, and the shared storage area and the shared data in other terminals in the group are synchronized.
Further, the sharing function unit 6 of the terminal B1 deletes the member table for the group C from its own shared storage area. The terminal B1 ends the leaving process from the group C by the process described above. Here, the terminal B1 exists in the member tables of both the group B and the group C during the period of incorporation into the group C, that is, belongs to both the group B and the group C. By the leaving process from the group C, it is described only in the member table of the group B.

  In addition, since each terminal that is a member of the group periodically detects (at every predetermined period) a terminal that has failed or that has been transferred and has left without permission, for example, the order described in the member table That is, whether a member described in the table next to itself exists or is operating normally is transmitted to the member, and a response packet to the confirmation packet is transmitted. Detect (monitors other terminals). At this time, the terminal described at the end of the table monitors the terminal described at the beginning of the table.

Here, for example, the n-th terminal n in the member table (in the order written in the member table) monitors the immediately following n + 1-th terminal (by sending a monitoring packet, receiving a response packet, etc.), and the previous n The first terminal n-1 is monitored, and similarly, this terminal n-1 is monitored by the immediately preceding terminal n-2.
Then, the immediately preceding terminal n-1 detects the state of the terminal n by the above-described processing, and when it detects that the terminal n is not operating normally (abnormal), the member table is rewritten to all members. Broadcast notification of processing.
At this time, when the terminal n-1 detects that the terminal n is abnormal, the terminal n-1 requests all other terminals other than the terminal n in the same group to determine whether the terminal n is abnormal. .
When the determination result that the terminal n is abnormal is returned from one or more other terminals, that is, from any of the terminals, the terminal n-1 responds to all the member terminals with the terminal n. In order to instruct to rewrite the member table and status table, a broadcast notification is made.
On the other hand, if there is no response from any of the terminals, the terminal n-1 may be abnormal, and therefore inquires of the group server about the states of the terminals n and n-1.
When the terminal n-1 is notified from the group server that the terminal n is abnormal, the terminal n-1 performs a broadcast notification requesting the deletion of the terminal n from the shared storage area, and is notified that the terminal n-1 is abnormal. Then, a broadcast notification requesting to delete itself from the shared storage area is made, and the user leaves the group.
In addition, when there are only two terminals in the group, if it is detected that there is an abnormality with each other, it is not possible to request confirmation from a terminal other than the monitoring target as described above. Queries the status of terminal n and terminal n-1.

As a result, as described above, the terminal n-1 broadcasts to all the terminals belonging to the group that the state table of the terminal n is deleted.
Similarly, the terminal n-1 broadcasts to all terminals belonging to the group that the terminal n is deleted from the member table.
Then, each terminal belonging to the group deletes the status table data of the terminal n and deletes the terminal n from the member table in response to the broadcast notification from the terminal n-1 that detects the abnormality of the terminal n. To do.
When the above-described detection process causes each terminal in the group to detect that the terminal that it monitors does not already exist in the group, or if it detects that the terminal has failed and cannot perform call processing, Broadcast notifications to all terminals, request deletion of this terminal (terminal in which an abnormality is detected) in the member table and deletion of data in the status table, and whether each terminal in the group is abnormal It is monitoring whether or not.

<Line disconnection sequence when on-hook at called party>
Next, when the terminal B1 (calling source) participating in the group B makes a call to the terminal B2 (calling destination) belonging to the same group B, and the terminal B2 of the called destination first goes on-hook. The sequence for disconnecting the line will be described with reference to FIG.
The sequence diagram of FIG. 8 shows a sequence process after step S7 of FIGS.
In the description of this process, as an example of the shared data synchronization process in the shared storage area, the “a” method in the previous “synchronization process of the shared storage area in the group” as in the “call sequence in the group” Will be described.
In addition, since the process of synchronizing the change of the shared data shared within the group is the same as the “call sequence within the group” already described, it is assumed that the data change terminal is requested to perform the synchronization process. The change process is omitted in the following description.

In step S7, when the call processing unit 1 of the terminal B2 detects that the user picks up the handset (off-hook state), the communication information I1 in the state table of its own shared storage area is changed from “incoming call” to “incoming call”. A request is sent to the data change terminal in charge of the divided area Q2, together with the ID number of the terminal itself, and the elapsed time T1 is reset and a new “incoming call” is requested. The counting of the elapsed time since the state changed to is started.
As a result, the data change terminal rewrites the communication state I1 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and to each other terminal in the group Then, a notification prompting the execution of the rewriting process from the “incoming call” to the “incoming call” is broadcast for the communication state I1 of the terminal B2 in the state table of the shared storage area.

Then, each terminal belonging to the group B receives the above broadcast, so that the ID number of the state table in the shared storage area of its own storage unit changes the communication information I1 of the terminal B2 from “incoming call”. Synchronize within the group for changes to "incoming call".
Further, the call processing unit 1 of the terminal B2 starts counting the elapsed time after the state is newly changed to “incoming call”, and then writes the time counted every predetermined time to the elapsed time T1. The process is requested by sending it to the data change terminal in charge of the divided area Q2 together with the ID number of the own terminal.

As a result, the data change terminal rewrites the elapsed time T1 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process to the elapsed time T1 of the terminal B2 with the ID number in the state table of the shared storage area being counted by the terminal B2 is broadcast.
Then, each terminal belonging to the group B receives the above broadcast, so that the time when the terminal B2 counts the elapsed time T1 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit. Synchronize within the group for changes to.
At this time, the call processing unit 1 of the terminal B2 stops the ringtone output from the speaker and notifies the user that the call is possible.

  When the call processing unit 1 of the terminal B1 detects that the communication state I1 in the state table of the supply storage area of the terminal B2 has transitioned to “incoming call”, the call processing unit 1 sets the communication state I1 in the state table of its own shared storage area. A synchronous process for rewriting from “calling” to “busy” is sent to the data change terminal in charge of the divided area Q2 together with the ID number of the own terminal and requested, and the state table of the shared storage area of the terminal B2 The elapsed time T2 is reset, and counting of the elapsed time since the state is newly changed to “busy” is started.

As a result, the data change terminal rewrites the communication state I1 of the terminal B1 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process from “calling” to “busy” is broadcast for the communication state I1 of the terminal B1 in the state table of the shared storage area.
Then, each terminal belonging to the group B receives the above broadcast, so that the ID number of the state table in the shared storage area of its own storage unit changes the communication information I1 of the terminal B1 from “calling” to “ Synchronize within the group for changes to "in call".

In addition, the call processing unit 1 of the terminal B1 starts counting the elapsed time after the state is newly changed to “busy”, and then writes the time counted every predetermined time to the elapsed time T2. Is transmitted together with the ID number of the terminal itself to the data change terminal in charge of the divided area Q2.
As a result, the data change terminal rewrites the elapsed time T2 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and for each other terminal in the group Thus, a notification prompting the execution of the rewriting process to the elapsed time T2 of the terminal B2 whose ID number in the state table of the shared storage area is counted as the time counted by the terminal B1 is broadcast.

Then, each terminal belonging to the group B receives the above broadcast, and the time when the terminal B1 counts the elapsed time T2 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit. Synchronize within the group with respect to the change to (step S7).
At this time, the call processing unit 1 of the terminal B1 stops the reading sound output from the speaker and notifies the user that the call is ready (that is, the line is connected). Encourage calls.

  Also in step S7, as in the case of calling in step S6, the radio processing units 1 on both the calling side and the called side have different communication paths when the elapsed time T1 and the elapsed time T2 are significantly different. If the traffic is high and voice communication cannot be performed, or if one of the systems goes down due to a load, etc., the communication status between the terminals is bad and it is in a “failed” state, so it is impossible to continue the call processing. If it is determined that the call is possible, the call process is stopped, the process proceeds to step S5, and the call process is stopped.

  Next, when the call processing unit 1 of the terminal B2 detects that the user has placed the handset on the terminal B2 (becomes on-hook state), the communication processing unit 1 stores the communication information I1 in the state table of its own shared storage area as “ A synchronization process for rewriting from “incoming call” to “disconnecting (indicating that the line is being disconnected)” is transmitted to the data change terminal in charge of the divided area Q2 together with the ID number of the terminal itself. Ask.

As a result, the data change terminal rewrites the communication state I1 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and to each other terminal in the group Thus, a notification prompting execution of the rewriting process from the “incoming call” to “disconnecting” state is broadcast for the communication state I1 of the terminal B2 in the state table of the shared storage area.
Then, each terminal belonging to the group B receives the above-mentioned broadcast, so that the ID number of the state table in the shared storage area of its own storage unit changes the communication information I1 of the terminal B2 from “incoming call”. Synchronize within the group for changes to "disconnecting".

  In step S8 ′, when the call processing unit 1 of the terminal B1 detects that the communication information I1 of the terminal B2 transitions from “incoming call” to “disconnected”, the call processing unit 1 in the state table of its own shared storage area The synchronization process for changing the call information I1 from “busy” to “reserved” and rewriting the call information I2 in the state table of the shared storage area of the terminal B2 from “busy” to “empty” is performed automatically. Along with the ID number of the terminal, the request is transmitted to the data change terminal in charge of the divided area Q2, and the connection state (connected line) of access to the terminal B1 is disconnected.

As a result, the data change terminal rewrites the communication state I2 of the terminal B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B1, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process from “busy” to “reservation canceled” is broadcast for the communication state I2 of the terminal B2 in the state table of the shared storage area.
Then, each terminal belonging to the group B receives the above broadcast, so that the ID number of the state table in the shared storage area of its storage unit changes the communication information I2 of the terminal B2 from “busy” to “ Synchronize within the group to the change to “Reservation canceled”.

When the call processing unit 1 of the terminal B2 detects that the communication information I2 in the state table of its own shared storage area has changed from “busy” to “empty”, the call processing unit 1 changes the communication information I1 from “busy”. A request for synchronization processing to be rewritten to “free” is sent to the data change terminal in charge of the divided area Q2 together with the ID number of the own terminal, and the connection state (connected line) of access to the terminal B1 is disconnected. .
As a result, the data change terminal rewrites the communication state I1 of the terminal table B2 with the ID number of the state table in the shared storage area of its own storage unit upon request from the terminal B2, and to each other terminal in the group Thus, a notification prompting the execution of the rewriting process from “incoming call” to “empty” is broadcast for the communication state I1 of the terminal B2 in the state table of the shared storage area.
Then, each terminal belonging to the group B receives the above-mentioned broadcast, so that the ID number of the state table in the shared storage area of its own storage unit changes the communication information I1 of the terminal B2 from “incoming call”. Synchronize within the group with respect to the change to “in-space”.

At this time, the call processing unit 1 of the terminal B2 outputs a sound for notifying the line disconnection indicating that the call is ended from the speaker, and notifies the user that the access to the call is disconnected.
As a result, both terminal B1 and terminal B2 return to the standby state of step S0 (a state where both outgoing and incoming calls are possible).
In the above description, the sequence of line disconnection (line disconnection when the callee is first on-hooked) with the callee terminal B2 in the same group B has been described. Is performed.

<Leaving sequence of terminal from group>
The removal of the terminal from the group is the same as the processing method from the participating group and from the joining group.
As already described, in step S8 at the end of the call, the call processing unit 1 of the terminal B1 needs to leave the group C, and therefore deletes itself from the member table to all other terminals in the group. Broadcast notification is sent.
Further, the call processing unit 1 of the terminal B1 requests the data change terminal to delete the status table corresponding to its own ID number from the data change terminal in charge of each divided area in the group C.
That is, the terminal B1 itself notifies each terminal belonging to the group C that the terminal B1 will be deleted from the member table, and the data change terminal corresponding to the divided area in the state table of the terminal B1 A broadcast notification is sent to each terminal belonging to group C that the state table of terminal B1 is to be deleted.

Then, each terminal of the group C member deletes the terminal B1 leaving the member table, and changes the status table to the data content notified by the broadcast from the data change terminal, so that each data change terminal shares Synchronize storage area and shared data.
In addition, each terminal that is a member of a group periodically detects a terminal that is a member of a group in order to detect when a terminal that has joined or incorporated has left the group without notification of leaving. Monitoring (every predetermined period), in the order listed in the member table, i.e. whether there are any members listed in the table next to them, or whether they are operating normally, A confirmation packet is transmitted to the member and detected by a response packet to the confirmation packet (monitors other terminals). At this time, the terminal described at the end of the table monitors the terminal described at the beginning of the table.

Here, for example, the n-th terminal n in the member table (in the order written in the member table) monitors the immediately following n + 1-th terminal (by sending a monitoring packet, receiving a response packet, etc.), and the previous n The first terminal n-1 is monitored, and similarly, this terminal n-1 is monitored by the immediately preceding terminal n-2.
Then, the immediately preceding terminal n-1 detects the state of the terminal n by the above-described processing, and when it detects that the terminal n is not operating normally (abnormal), the member table is rewritten to all members. Broadcast notification of processing.
At this time, when the terminal n-1 detects that the terminal n is abnormal, the terminal n-1 requests all other terminals other than the terminal n in the same group to determine whether the terminal n is abnormal. .
When the determination result that the terminal n is abnormal is returned from one or more other terminals, that is, from any of the terminals, the terminal n-1 responds to all the member terminals with the terminal n. In order to instruct to rewrite the member table and status table, a broadcast notification is made.
On the other hand, if there is no response from any of the terminals, the terminal n-1 may be abnormal, and therefore inquires of the group server about the states of the terminals n and n-1.
When the terminal n-1 is notified from the group server that the terminal n is abnormal, the terminal n-1 performs a broadcast notification requesting the deletion of the terminal n from the shared storage area, and is notified that the terminal n-1 is abnormal. Then, a broadcast notification requesting to delete itself from the shared storage area is made, and the user leaves the group.
In addition, when there are only two terminals in the group, if it is detected that there is an abnormality with each other, it is not possible to request confirmation from a terminal other than the monitoring target as described above. Queries the status of terminal n and terminal n-1.

As a result, as described above, the terminal n-1 broadcasts to all the terminals belonging to the group that the state table of the terminal n is deleted.
Similarly, the terminal n-1 broadcasts to all terminals belonging to the group that the terminal n is deleted from the member table.
Then, each terminal belonging to the group deletes the status table data of the terminal n and deletes the terminal n from the member table in response to the broadcast notification from the terminal n-1 that detects the abnormality of the terminal n. To do.
When the above-described detection process causes each terminal in the group to detect that the terminal that it monitors does not already exist in the group, or if it detects that the terminal has failed and cannot perform call processing, Broadcast notifications to all terminals, request deletion of this terminal (terminal in which an abnormality is detected) in the member table and deletion of data in the status table, and whether each terminal in the group is abnormal It is monitoring whether or not.

  2 to realize the functions of the call processing unit 1, the called party group detecting unit 2, the intra-group called destination terminal state detecting unit 3, the inter-group called destination terminal state detecting unit 4, and the shared function unit 6. May be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed to execute a call sequence process. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a conceptual diagram which shows the example of a connection of the telephone switching system in one Embodiment of this invention. It is a block diagram which shows the structural example of the terminal used in the telephone switching system of one Embodiment of this invention. It is a conceptual diagram explaining the process of participation to the group of a terminal. It is a sequence diagram which shows the process of participation to the group of a terminal. It is a state transition diagram explaining the process of the outgoing call and incoming call in a call sequence. It is a sequence diagram which shows the process of the outgoing call in a call sequence, and an incoming call. It is a sequence diagram which shows the process of the outgoing call in a call sequence, and an incoming call. FIG. 10 is a sequence diagram when the called party disconnects a line in a call sequence. It is a conceptual diagram explaining the transfer process to the group different from the group which is participating.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Call processing part 2 ... Callee group detection part 3 ... In-group callee terminal state detection part 4 ... Inter-group callee terminal state detection part 5 ... Memory | storage part 6 ... Shared function part

Claims (22)

A plurality of terminals connected to the network form a group of one or a plurality of terminals that share terminal information including communication information indicating unique information and a communication state of each terminal. A shared storage area for storing terminal information of all terminals belonging to the group is provided in a plurality of terminals, and each time the terminal information belonging to the group is changed due to the transition of the terminal state including incorporation or withdrawal of the terminals, each group A telephone exchange system having a network information sharing function for performing update control of terminal information stored in the shared storage area in order to synchronize information in the shared storage area
Each terminal is
A call destination group detection means for detecting whether or not the call destination and the caller itself belong to the same group when performing call processing;
When the call destination is the same group as itself, the in-group call destination terminal state detection means for detecting communication information of the call destination in the shared storage area in the group;
If the called party is a group different from the group to which the called party belongs, the terminal information is registered in the shared storage area of the group to which the called terminal belongs and is transferred to the called group. Inter-group call destination terminal state detection means for detecting communication information of the call destination in the shared storage area of
A telephone exchange system comprising: call processing means for executing a call process with a called terminal based on detected communication information.   When the intra-group call destination terminal status detection means and the inter-group call destination terminal status detection means detect from the communication information that the call destination is idle, the call processing means detects the call destination terminal group. In the shared storage area, the incoming call information is written as the communication information and the outgoing information is written as the own communication information. The call processing means of the called terminal changes the communication information based on the incoming call information. The telephone exchange system according to claim 1, wherein mutual telephone call processing is performed.   State table composed of own terminal information storage area for writing its own terminal information for each terminal in the shared storage area, and an incoming terminal information storage area for writing the communication state viewed from other terminals as terminal information The telephone exchange system according to claim 1, wherein the telephone exchange system is provided.   4. A member table in which all terminals in a group to which a terminal belongs and an address of the terminal are associated with each terminal in the shared storage area. The telephone exchange system described in Crab.   In the call processing, the terminal that is the caller incorporates into the group of the callee terminals and writes the reserved information as the callee information in the communication information field in the callee information storage area of the callee terminal. 5. The telephone exchange system according to claim 4, wherein the call processing is performed by the above.   The terminal that is the callee receives the incoming call by detecting the writing of the reserved information of the caller terminal in the communication information field in the receiving terminal information storage area of its shared storage area. 5. The telephone switching system according to claim 4, wherein the telephone switching system is detected to be in a state.   When the caller is making a call and the reserved information is written as the incoming call information in the communication information field in the called terminal's incoming terminal information storage area, the reserved information is written a predetermined number of times in advance. The telephone switching system according to any one of claims 3 to 6, wherein if the call cannot be made, the call is disconnected.   After the state transition of the calling process and the incoming call process, both the called side and the calling side detect the elapsed time of the own terminal information storage area and the called terminal information storage area in the shared storage area on the called side, and the progress 8. The telephone exchange system according to claim 6, wherein whether or not the call is disconnected is determined based on whether or not the time difference exceeds a predetermined value.   In the off-hook period during the incoming call, the caller detects the elapsed time counted after changing its own state and the elapsed time until the caller changes to the off-hook state. 9. The telephone exchange system according to claim 8, wherein whether or not the call is disconnected is determined based on whether or not a preset time is exceeded.   The connection is disconnected when it is detected that the called party is no longer in a state of a call to itself by referring to the state of the calling party in the communication information column in the receiving terminal information storage area of the shared storage area. The telephone exchange system according to any one of claims 3 to 9.   11. When a terminal leaves a group, if information on the terminal remains in the shared storage unit, a predetermined terminal erases information on the terminal that has left the shared storage unit. The telephone exchange system as described in any one of.   12. The call destination group detection unit performs a process of detecting an identification number of a group to which the call destination belongs at the time of a call process. Telephone exchange system.   13. The telephone exchange system according to claim 12, wherein the called party group detecting means performs a predetermined calculation on the telephone number of the called party and obtains a group identification number as a result of the calculation.   13. The telephone according to claim 12, wherein the called party group detecting means makes an inquiry to a terminal management server having a correspondence table of telephone numbers and group identification numbers, and obtains the group identification number as an inquiry result. Exchange system.   13. The telephone according to claim 12, wherein the called party group detecting means inquires of the other terminal in the group about the group number corresponding to the telephone number, and obtains the group identification number as the inquiry result. Exchange system.   The called party group detecting means extracts the group number corresponding to the telephone number from the correspondence table of the telephone number and the group number stored in the shared storage unit, and obtains the group identification number as the extraction result. The telephone exchange system according to claim 12, characterized in that   In order to synchronize the storage contents of each shared storage area in the group, a data change terminal is provided that detects a change in the shared data stored in the shared storage area and broadcasts the change contents to each terminal. The telephone exchange system according to any one of claims 1 to 16, wherein the telephone exchange system is characterized in that   18. The telephone exchange system according to claim 17, wherein each time the data change terminal performs a broadcast process, a terminal in the group is set as a next data change terminal in order.   19. The telephone exchange system according to claim 17 or 18, wherein each terminal reads data in a shared storage area of the data change terminal and synchronizes the shared storage area in response to the notification from the data change terminal. A plurality of terminals connected to the network form a group of one or a plurality of terminals that share terminal information including communication information indicating unique information and a communication state of each terminal. A shared storage area for storing terminal information of all terminals belonging to the group is provided in a plurality of terminals, and each time the terminal information belonging to the group is changed due to the transition of the terminal state including incorporation or withdrawal of the terminals, each group Is a telephone exchange method having a network information sharing function for performing update control of terminal information stored in the shared storage area in order to synchronize information in the shared storage area in
The call process performed by each terminal is as follows.
A callee group detection process for detecting whether the callee and the caller belong to the same group when performing a call process;
When the called party is the same group as itself, the in-group called terminal status detection process for detecting the communication information of the called party in the shared storage area in the group;
If the called party is a group different from the group to which the called party belongs, the terminal information is registered in the shared storage area of the group to which the called terminal belongs and is transferred to the called group. An inter-group call destination terminal state detection process for detecting communication information of a call destination in the shared storage area of
A telephone exchange method comprising: a telephone call processing step for executing a telephone call process with a called terminal based on detected communication information. A plurality of terminals connected to the network form a group of one or a plurality of terminals that share terminal information including communication information indicating unique information and communication status of each terminal, and the same for each group A shared storage area for storing terminal information of all terminals belonging to the group is provided in a plurality of terminals, and each time the terminal information belonging to the group is changed due to the transition of the terminal state including the incorporation or withdrawal of the terminals, each group In order to synchronize the information in the shared storage area in the computer, a program for causing the computer to perform telephone exchange having a network information sharing process for performing update control of terminal information stored in the shared storage area,
Call processing performed by each terminal is as follows.
A call destination group detection process for detecting whether the call destination and the caller itself belong to the same group when performing a call process;
When the called party is the same group as itself, the in-group called terminal status detection process for detecting the communication information of the called party in the shared storage area in the group;
If the called party is a group different from the group to which the called party belongs, the terminal information is registered in the shared storage area of the group to which the called terminal belongs, and is transferred to the called group. An inter-group call destination terminal state detection process for detecting communication information of a call destination in the shared storage area of
A computer-executable program comprising: a call processing process for executing a call process with a called terminal based on detected communication information. A plurality of terminals connected to the network form a group of one or a plurality of terminals that share terminal information including communication information indicating unique information and a communication state of each terminal. A shared storage area for storing terminal information of all terminals belonging to the group is provided in a plurality of terminals, and each time the terminal information belonging to the group is changed due to the transition of the terminal state including incorporation or withdrawal of the terminals, each group A terminal used in a telephone exchange system having a network information sharing function for performing update control of terminal information stored in the shared storage area in order to synchronize information in the shared storage area in
A call destination group detection means for detecting whether or not the call destination and the caller itself belong to the same group when performing call processing;
When the call destination is the same group as itself, the in-group call destination terminal state detection means for detecting communication information of the call destination in the shared storage area in the group;
If the called party is a group different from the group to which the called party belongs, the terminal information is registered in the shared storage area of the group to which the called terminal belongs and is transferred to the called group. Inter-group call destination terminal state detection means for detecting communication information of the call destination in the shared storage area of
A call processing means for executing a call process with a called terminal based on detected communication information.

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