JP6315592B2 - Call control server and call control system operating method - Google Patents

Description

  The present invention relates to a call control system, a call control server, and an operation method of the call control system.

  FIG. 7 is a system configuration diagram of a system (subscriber management server cooperation system) that cooperates with a subscriber management server that manages subscriber information and a call control server that performs call processing control as a session control system for IP telephones.

  The call control server (1a, 1b, etc.) has the subscriber information 100 of the terminal that has registered its location. The call control server acquires the subscriber information 100 from the subscriber management server 2 in response to the location registration.

  The subscriber management server 2 acquires subscriber information 100 of terminals registered in the call control server, subscriber information 101 of terminals not registered in the call control server, and which subscriber information is acquired by which call control server. It has information 103 of whether or not.

  When the call control server receives the call signal from the terminal 3, the call control server inquires the subscriber management server 2 about the destination call control server, and transfers the call signal to the destination call control server.

"18th IMS (IP multimedia subsystem) (Part 2)", [online], Nikkei Computer, [December 2, 2014 search], Internet <URL: http://itpro.nikkeibp.co.jp/article / COLUMN / 20070903/281035 />

  In the above-described method, the IP telephone provider assumes that a part of terminals connected to the call control server performs location registration, for example, during normal operation (FIG. 8). In this case, the following problem occurs.

  For example, in the call control server 1a of FIG. 8, if all terminals try to perform location registration for some reason (disaster etc.), the number of location registered terminals reaches the upper limit, and location registration cannot be performed beyond that. . Therefore, a situation occurs in which a terminal that is not registered for location cannot make and receive calls.

  At present, even when such a situation occurs, it is not possible for another call control server 1b whose number of registered terminals has not reached the upper limit, that is, a call control server having a free space, to register the position instead. Is possible.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique in which another call control server registers a terminal in place of a call control server that cannot register the terminal. It is in.

In order to solve the above problems, a first aspect of the present invention is a call control server connected to a subscriber management server and a plurality of terminals via a line, and the subscriber stored in the call control server A subscriber information storage unit storing a record including subscriber information of the terminal for each terminal corresponding to the information, a counter indicating the number of subscriber information in the subscriber information storage unit, and a memory stored in the call control server An upper limit storage unit that stores the upper limit of the number of terminals corresponding to the subscriber information to be stored, and a list that stores the telephone numbers of the terminals that transmitted the location registration signal transferred to another call control server that is not the call control server A list storage unit that receives the location registration signal, and if the value of the counter is equal to or greater than the upper limit, transfers the location registration signal to another call control server and stores the telephone number of the corresponding terminal in the list The location registration signal is received, the value of the counter is less than the upper limit, the telephone number of the corresponding terminal is stored in the list, and the number of free spaces that is the number obtained by subtracting the value of the counter from the upper limit is stored in the list. If there is more than the total number of stored telephone numbers, the telephone number of the terminal is deleted from the list, the subscriber information of the terminal is obtained from the subscriber management server, and a record including the subscriber information is stored in the subscriber If it is stored in an information storage unit, receives a location registration signal, the value of the counter is less than the upper limit, and the telephone number of the corresponding terminal is not stored in the list, the subscriber information of the terminal Is acquired from the subscriber management server, a record including the subscriber information is stored in the subscriber information storage unit, and a location registration unit is provided.

A second aspect of the present invention is an operation method of a call control system comprising a plurality of call control servers connected to a subscriber management server and a plurality of terminals via lines, wherein each call control server For each terminal corresponding to subscriber information stored in the control server, a subscriber information storage unit storing a record including subscriber information of the terminal, and a counter indicating the number of subscriber information in the subscriber information storage unit An upper limit storage unit that stores the upper limit of the number of terminals corresponding to the subscriber information stored in the call control server, and the terminal that transmitted the location registration signal transferred to another call control server that is not the call control server A list storage unit for storing a list for storing telephone numbers, and receiving a registration signal, and if the value of the counter is equal to or greater than the upper limit, the location registration signal is transferred to another call control server, Applicable Storing the last telephone number in the list; receiving a location registration signal; the value of the counter being less than the upper limit; the telephone number of the corresponding terminal being stored in the list; If the number of vacant numbers, which is the number obtained by subtracting the value, is larger than the total number of telephone numbers stored in the list, the telephone number of the terminal is deleted from the list, and the subscriber information of the terminal is obtained from the subscriber management server. Acquiring and storing a record including the subscriber information in the subscriber information storage unit; receiving a location registration signal; a value of the counter being less than the upper limit; and a telephone number of the corresponding terminal being the list The subscriber information of the terminal is obtained from the subscriber management server, and a record including the subscriber information is stored in the subscriber information storage unit. And carrying out a flop, the.

  According to the present invention, instead of a call control server that cannot register the location of a terminal, another call control server can register the location of the terminal.

It is a block diagram which shows the structure of the call control server which concerns on this Embodiment. 3 is a diagram illustrating an example of a configuration of a list storage unit 12. FIG. It is a figure which shows an example of a structure of the subscriber information storage part. It is a sequence diagram which shows the operation | movement in this Embodiment. It is a flowchart of a position registration process (S2). It is the flowchart of the call control server which registered the position of the terminal instead of the other call control server. It is a system block diagram of a subscriber management server cooperation system. It is a figure which shows a mode that the call control server 1b cannot perform position registration instead of the call control server 1a.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a call control server according to the present embodiment.

  The call control server 1 shown in FIG. 1 is connected to the subscriber management server 2 and a plurality of terminals 3 via lines in the same manner as the call control server 1a shown in FIG. 7, and is connected to other call control servers 1b and the like. Connected through.

  The call control server 1 has an upper limit storage unit 11 that stores an upper limit (referred to as an upper limit T) of the number of terminals 3 that can be registered with itself, and a telephone number of a terminal that has registered with another call control server instead of itself. List storage unit 12 that stores a list (referred to as list L), subscriber information storage unit 13 that stores subscriber information of the terminal 3 registered in itself, and the number of subscriber information in the subscriber information storage unit 13 , A location registration unit 15 for registering the location of the terminal 3, and a call control unit 16 for controlling a call.

  The upper limit T is variable. For example, when the load on the call control server 1 is high, the upper limit T is low. On the other hand, when the load on the call control server 1 is low, the upper limit T is high.

  Note that the upper limit storage unit 11 and the list storage unit 12 are not required when the location of the terminal is not registered in another call control server.

  FIG. 2 is a diagram illustrating an example of the configuration of the list storage unit 12.

  The list storage unit 12 stores a list L of the telephone numbers of the terminals whose locations are registered in other call control servers. In addition, when the terminal is registered to a plurality of other call control servers, a list L is generated for each call control server.

  FIG. 3 is a diagram illustrating an example of the configuration of the subscriber information storage unit 13.

  The subscriber information storage unit 13 includes a record including the location information of the terminal and subscriber information for each terminal whose location is registered in the call control server itself provided with the subscriber information storage unit 13. Instead, the location record of the registered terminal includes location information of the other call control server (referred to as server location information). When the location of the terminal is not registered in place of another call control server, the server location information is unnecessary. In this specification, the position information is an address or the like.

  FIG. 4 is a sequence diagram showing an operation in the present embodiment.

  The call control servers 1A and 1B in the figure have the same configuration as the call control server 1 in FIG.

  The terminal 3 transmits a location registration signal to the call control server 1A that is determined in advance as a prescribed transmission destination of the location registration signal for location registration, and the location registration unit 15 of the call control server 1A receives the location registration signal. (S1).

  Next, the location registration unit 15 of the call control server 1A performs location registration processing for the terminal 3 that has transmitted the location registration signal (S2).

  FIG. 5 is a flowchart of the location registration process (S2).

  The location registration unit 15 of the call control server 1A compares the value of the counter 14 (hereinafter, the number C of location registration terminals) with the upper limit T (S21).

  If the number C of location registration terminals is equal to or greater than the upper limit T (C ≧ T), the location registration unit 15 transfers a location registration signal to the other call control server 1B (S22). For example, the location registration unit 15 stores in advance location information of the call control server 1B that is the transmission destination, and transmits a location registration signal with this location information as a destination (S22). Alternatively, the subscriber management server 2 acquires the number C of location registration terminals and the upper limit T from each call control server, and the location registration unit 15 sets the number of location registration terminals C to the upper limit T with respect to the subscriber management server 2. The call control server 1B inquires which call control server satisfies the condition of less than that, and transmits a location registration signal to the call control server 1B that satisfies the condition (S22). In any case, the location registration unit 15 includes location information of the call control server 1A itself in the location registration signal.

  Next, the location registration unit 15 stores the telephone number of the terminal 3 that transmitted the location registration signal in the list L (S23), and ends the location registration process.

  On the other hand, if the number C of location registration terminals is less than the upper limit T (C <T), the location registration unit 15 determines whether the telephone number of the terminal 3 that transmitted the location registration signal is stored in the list L (S24). ).

  If the telephone number of the terminal 3 that transmitted the location registration signal is not stored in the list L (S24: NO), the location registration unit 15 proceeds to S25.

  If the telephone number of the terminal 3 that has transmitted the location registration signal is stored in the list L (S24: YES), the location registration unit 15 subtracts the number C of location registration terminals from the upper limit T (hereinafter referred to as the number of vacant numbers D). ) And the total number of telephone numbers stored in the list L (all if there are a plurality of lists L) (hereinafter referred to as the total number N), and compares the free number D with the total number N (S26).

  The position registration unit 15 ends the position registration process if the number of empty spaces D is equal to or less than the total number N (S26: D ≦ N).

  On the other hand, if the vacant number D is greater than the total number N (S26: D> N), the location registration unit 15 deletes the telephone number of the terminal 3 from the list L (S27), and proceeds to S25.

  In step S25, the location registration unit 15 registers the location of the terminal 3 (S25). Here, the location registration unit 15 acquires the subscriber information of the terminal 3 from the subscriber management server 2, and stores a record including the location information of the terminal 3 and the subscriber information in the subscriber information storage unit 13. Store (S25). When the location registration unit 15 receives a location registration signal from another call control server, the location registration unit 15 includes the location information (server location information) of the call control server in the record (S25).

  Next, the location registration unit 15 adds 1 to the counter 14 (S28), and ends the location registration process.

  Returning to FIG. 4, the call control server 1B receives the location registration signal (S22), and the location registration unit 15 of the call control server 1B registers the location of the terminal 3 (S3). Here, the location registration unit 15 performs the processing of the flowchart shown in FIG. 5, thereby obtaining the subscriber information of the terminal 3 from the subscriber management server 2 and the location of the call control server 1 </ b> A from the location registration signal. The information is read, and the subscriber information storage unit 13 stores the location information of the terminal 3, the subscriber information, and a record including the location information (server location information) (S3).

  When making a call to the remote terminal 3e, the terminal 3 transmits a call signal to the call control server 1A, and the call control unit 16 of the call control server 1A receives the call signal (T1).

  The call control unit 16 receives the call signal (T1), and if the telephone number of the terminal 3 that has transmitted the call signal is stored in the list L, the call control unit 16 uses a predetermined call transfer identifier IDs as the call signal. (T2), the call signal is transferred to the other call control server 1B corresponding to the list L in which the telephone number of the terminal 3 that transmitted the call signal is stored (T2).

  The call control unit 16 of the call control server 1B receives the call signal (T2), and if the call transfer identifier IDs is included, receives the call signal from the terminal 3 connected to the call control server 1B. Call processing is performed in the same manner as in the case of the above. That is, the call control unit 16 acquires information on the call control server 1E where the destination terminal 3e is registered from the subscriber management server 2 and transmits a call signal to the call control server 1E (T3). Thereby, the call control server 1E transmits a call signal to the terminal 3e (T4).

  The remote terminal 3e transmits a call signal to the call control server 1E when calling the terminal 3 (T11). The call control server 1E acquires information on the call control server 1B where the terminal 3 on the called side is registered from the subscriber management server 2 and transmits a call signal to the call control server 1B (T12).

  The call control unit 16 of the call control server 1B receives the call signal (T12), a record corresponding to the called terminal 3 set in the call signal is stored in the subscriber information storage unit 13, and If the server location information is included in the record, the location information of the terminal 3 is read from the record, the location information and a predetermined incoming call transfer identifier IDr are included in the call signal, and the server location information is transmitted to the server location information. The call signal is transferred (T13).

  The call control unit 16 of the call control server 1A receives the call signal, and if the call signal includes the call transfer identifier IDr, reads the position information of the called terminal from the call signal, The call signal is transferred to the information (T14).

  Therefore, the terminal 3 can perform outgoing and incoming calls, and can talk to the remote terminal 3e.

  FIG. 6 is a flowchart of processing separately performed in a call control server (for example, call control server 1B in FIG. 4) in which a terminal is registered in place of another call control server.

  Here, the location registration unit 15 writes the location registration time to the corresponding record in the subscriber information storage unit 13 during location registration (S3 in FIG. 4).

  As shown in FIG. 6A, the location registration unit 15 determines whether or not a predetermined time has elapsed since the location registration time of any record in the subscriber information storage unit 13 (S101). . If this condition is satisfied in any record (S101: YES), the location registration unit 15 deletes the location information and server location information of the terminal in that record (S102), and returns to S101.

  On the other hand, as shown in FIG. 6B, the location registration unit 15 searches the subscriber information storage unit 13 for a record without the location information of the terminal (S201). When there is a record without terminal location information (S201: YES), the location registration unit 15 deletes the record (S201) and returns to S201.

  Thereby, for example, the terminal 3 in FIG. 4 cannot make a call and transmits a location registration signal to the call control server 1A again. If it is determined in step S26 of FIG. 5 that the number D of empty spaces is greater than the total number N (D> N), the terminal 3 is registered in the call control server 1A (S25).

  Therefore, according to the present embodiment, instead of the call control server that cannot register the location of the terminal, another call control server can register the location of the terminal, and furthermore, a call is made in the same manner as when the location registration is performed in the former call control server. be able to.

  Further, the location registration destination of the terminal can be returned from another call control server to the specified call control server. For example, even if step S26 in FIG. 5 is not provided, location registration is gradually performed in the specified call control server in the process of the vacant number D gradually increasing, so that the location registration destination of the terminal is changed to another call control destination. The server can return to the default call control server.

  On the other hand, by providing the step S26, the location registration is not performed in the specified call control server until the number of empty D exceeds the total number N, and the location registration is performed in the specified call control server after the empty number D exceeds the total number N. Thus, the location registration destination of the terminal can be returned in a relatively short period.

  The computer program for causing the computer to function as the call control server of the present embodiment can be recorded on a computer-readable recording medium such as a semiconductor memory, a magnetic disk, an optical disk, a magneto-optical disk, a magnetic tape, and the Internet. It can be widely distributed by being transmitted through a communication network such as

DESCRIPTION OF SYMBOLS 1 Call control server 2 Subscriber management server 3 Terminal 11 Upper limit memory | storage part 12 List memory | storage part 13 Subscriber information memory | storage part 14 Counter 15 Location registration part 16 Call control part L List IDs Call transfer identifier IDr Call transfer identifier

Claims (4)

A call control server connected to a subscriber management server and a plurality of terminals via a line ;
A subscriber information storage unit in which a record including subscriber information of the terminal is stored for each terminal corresponding to the subscriber information stored in the call control server;
A counter indicating the number of subscriber information in the subscriber information storage unit;
An upper limit storage unit for storing an upper limit of the number of terminals corresponding to the subscriber information stored in the call control server;
A list storage unit for storing a list for storing a telephone number of a terminal that has transmitted the location registration signal transferred to another call control server that is not the call control server;
If a location registration signal is received and the counter value is equal to or greater than the upper limit, the location registration signal is transferred to another call control server, and the telephone number of the corresponding terminal is stored in the list, while the location registration signal is received. The counter value is less than the upper limit, the telephone number of the corresponding terminal is stored in the list, and the number of empty numbers that is the number obtained by subtracting the counter value from the upper limit is stored in the list. If the number is greater than the total number, the phone number of the terminal is deleted from the list, the subscriber information of the terminal is acquired from the subscriber management server, and the record including the subscriber information is stored in the subscriber information storage unit If the location registration signal is received, the value of the counter is less than the upper limit, and the telephone number of the terminal is not stored in the list, the subscriber information of the terminal is stored. Serial obtained from the subscriber management server, call control server characterized in that it comprises a stores the record including the subscriber information to the subscriber information storage unit the location registration unit. The call control server according to claim 1 , wherein the location registration unit deletes the record when a predetermined time has elapsed from the time when the record is stored in the subscriber information storage unit. When the location registration unit receives a location registration signal transferred from another call control server that has received the location registration signal transmitted from the terminal, the location registration unit adds the record to the record to be stored in the subscriber information storage unit. Including the location information of the terminal corresponding to the user information and the server location information which is the location information of the other call control server,
Each call control server
If a call signal is received from a terminal and the telephone number of the terminal is stored in the list, a predetermined call transfer identifier is included in the call signal and transferred to another call control server. , A call signal is received from another call control server, a record corresponding to the called terminal set in the call signal is stored in the subscriber information storage unit, and the server location information is included in the record If so, the location information of the terminal is read from the record, the location information and a predetermined incoming call transfer identifier are included in the call signal and transferred to the server location information, and the call is transmitted from another call control server. If the received call transfer identifier is included in the call signal, the call control unit reads out the location information of the terminal from the call signal and transfers the call signal to the location information. With features The call control server according to claim 1 or 2 . An operation method of a call control system comprising a plurality of call control servers connected to a subscriber management server and a plurality of terminals via a line,
Each call control server
A subscriber information storage unit in which a record including subscriber information of the terminal is stored for each terminal corresponding to the subscriber information stored in the call control server;
A counter indicating the number of subscriber information in the subscriber information storage unit;
An upper limit storage unit for storing an upper limit of the number of terminals corresponding to the subscriber information stored in the call control server;
A list storage unit that stores a list that stores the telephone number of the terminal that has transmitted the location registration signal transferred to another call control server that is not the call control server, and
Receiving a location registration signal, and if the value of the counter is greater than or equal to the upper limit, transferring the location registration signal to another call control server and storing the telephone number of the corresponding terminal in the list;
The location registration signal is received, the value of the counter is less than the upper limit, the telephone number of the corresponding terminal is stored in the list, and the number of free spaces that is the number obtained by subtracting the value of the counter from the upper limit is stored in the list. If it is greater than the total number of stored telephone numbers, the telephone number of the terminal is deleted from the list, subscriber information of the terminal is obtained from the subscriber management server, and a record including the subscriber information is added to the subscription Storing in the person information storage unit;
If a location registration signal is received, the counter value is less than the upper limit, and the telephone number of the terminal is not stored in the list, the subscriber information of the terminal is acquired from the subscriber management server. And a step of storing a record including the subscriber information in the subscriber information storage unit .

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