JP5008337B2 - Call control server and method thereof - Google Patents

Description

  The present invention prevents congestion of a network by restricting calls from or to a terminal in a system that controls communication between terminals by sending a communication request message to a call control server at the start of communication from the terminal. The present invention relates to a technology and a technology for ensuring communication even in a state where a network and a call control server are congested.

  In a system that controls communication between terminals by sending a communication request message to the call control server at the start of communication from the terminal, communication between terminals is not performed when the call control server is congested even if there is sufficient communication path between terminals. become unable. In addition, if the incoming call control server is congested, communication cannot be performed even if the outgoing call control server has sufficient processing capacity.

  In such a system, the calling side call control server monitors its own congestion state and restricts outgoing calls from the terminal when congestion occurs, and when the called side call control server is congested, the outgoing call control server It is possible for the incoming call control server to be further congested by restricting the outgoing call from the terminal by the incoming call control server (see Patent Document 1).

Next, a configuration according to Patent Document 1 will be described with reference to FIGS. 9 and 10.
In Patent Document 1, as shown in FIG. 9, the call control server 1005 accommodates terminals 1001 and 1002 and accommodates call control server 1006 terminals 1003 and 1004. Further, one congestion control device is connected to each call control server, a congestion control device 1007 is connected to the call control server 1005, and a congestion control device 1008 is connected to the call control server 1006. Further, the congestion control devices 1007 and 1008 are connected to the counting device 1009.

The call control servers 1005 and 1006 process a call of a terminal accommodated therein.
The congestion control devices 1007 and 1008 measure the load on the call control server to be connected, and regulate call processing during congestion.

  Further, the aggregation device 1009 receives and records the load information of the call control server 1005 or 1006 periodically transmitted from the congestion control device 1007 or 1008, and when the restriction instruction information is received from the congestion control device. The received load information and regulation instruction information are output to the display device.

FIG. 10 is a diagram showing a configuration of the congestion control device (1007 or 1008) of FIG.
In the congestion control device, the processing load measuring unit 2002 measures the load on the call control server connected to the congestion control device.
Next, the load threshold management unit 2003 detects whether or not the load measured by the processing load measuring unit 2002 exceeds a predetermined load processing threshold, thereby congesting the call control server to which the congestion control device is connected. This is monitored, and the monitoring result is transmitted to the restriction control unit 2004.

The own server originating load measuring unit 2005 measures a load related to processing of a call issued from the own call control server, and transmits the measurement result to the restriction control unit 2004.
The other server-originated load measuring unit 2006 measures a load related to processing of a call issued from the other call control server, and transmits the measurement result to the restriction control unit 2004.

Next, the regulation control unit 2004, based on the measurement results of the own server originating load measuring unit 2005 and the other server originating load measuring unit 2006 and the monitoring result of the load threshold management unit 2003, via the regulation executing unit 2008, In the congested call control server, the call processing of the terminal accommodated by the congested call control server is restricted.
Further, the restriction control unit 2004 transmits restriction instruction information for restricting outgoing calls to the congested call control server to the other call control server via the restriction request transmission unit 2007.

  Further, the restriction request receiving unit 2009 of the congestion control device receives the restriction instruction information transmitted from the other congestion control device via the restriction request transmitting unit 2007, and based on the received restriction instruction information, from the own call control server. The processing of calls to the congested call control server is restricted via the restriction enforcement unit 2008.

  In addition, the restriction control unit 2004 has a function of measuring the time when the processing load exceeds the processing load threshold in the call control server that has become congested, and adjusting the level of restriction every time the measured time elapses. Have.

In the configuration of Patent Document 1 as described above, when the congestion control device detects that the monitoring target call control server is congested, a call is made so as to regulate communication toward the congested call control server. The restriction instruction information is transmitted to the control server.
The call control server that has received the restriction instruction information from the congestion control device restricts communication from the accommodating terminal to the congested call control server based on the received restriction instruction information.

When the terminal accommodated in the congested call control server directly transmits to the congested call control server, the communication of the terminal accommodated in the congested call control server is regulated.
The above call restriction is because the call control server limits the number of communication processing to a preset value according to the restriction level, and does not process the communication exceeding the limit, thereby further congesting the call control server that is congested. Can be prevented.

On the other hand, there is a second technique described below as a conventional technique related to malicious call countermeasures that induces congestion of the call control server.
In a general communication system, since the number of terminals is larger than the number of call control servers, the call control server does not directly accommodate the terminals, but the gateway device directly accommodates the call control server. Multiple units are accommodated. In this case, when outgoing calls are restricted only by the call control server, the network from the terminal to the gateway device and from the gateway device to the call control server is congested. This congestion cannot be prevented by outgoing call regulation in the call control server.

In order to solve this problem, a function for discarding a call for communication to or from a specific terminal is added to a gateway apparatus that directly accommodates a plurality of terminals, and between the gateway apparatus and the call control server. Add a communication function for control.
Next, when the call control server detects that a specific terminal has made a large number of calls, the detected call control server instructs the gateway device to cancel calls from or to the specific terminal. Send. Next, the gateway device that has received the instruction information discards a call from or to a specific terminal based on the received instruction information. As described above, the call can be regulated by the gateway device that is the preceding stage of the call control server.

FIG. 11 shows a configuration diagram of the system. The operation of the system will be described with reference to FIG.
The call control server 3005 holds, as accommodation terminal data, identification information of terminals accommodated by itself and accommodation information indicating which gateway device the terminal is directly accommodated in. The gateway device 3003 or 3004 has a function of discarding all packets transmitted from the terminal and packets arriving at the terminal for each terminal.

The call control server 3005 monitors the number of communication request messages issued by the terminals in all terminals accommodated by the call control server 3005 (steps S4001 and 4002).
Next, when monitoring, the call control server 3005 detects a terminal that transmits the number of communication request messages exceeding the threshold value within a certain time (step S4003), the accommodation terminal data is referred to, and the detected terminal identification information is obtained. Originally, the gateway device in which the corresponding terminal is accommodated is identified from the accommodated terminal data (step S4004), and the restriction instruction information for instructing the restriction of the detected terminal is transmitted to the identified gateway device (step S4005).
Next, the gateway device that has received the restriction instruction information from the call control server 3005 discards the packet issued by the corresponding terminal and the packet to the corresponding terminal based on the received restriction instruction information (step S4006).
Here, there is no influence on the packet transmitted from the other terminal and the packet to the other terminal.

If the call control server 3005 does not detect a terminal that transmits the number of communication request messages exceeding the threshold value within a predetermined time in step 4003, the call control server 3005 performs normal communication processing for the terminal (step S4007).
Therefore, there is no influence on the communication of terminals other than the terminal that transmits the number of communication request messages exceeding the threshold within a certain time.

In the technique of Patent Document 1, the call control server and the congestion control device are described as separate devices, but it is also possible to integrate the call control server and the congestion control device into a call control server including the congestion control device.
Further, the call control server in the description of the second technique is described as a call control server including a congestion control device.

As described above, the technique according to Patent Document 1 and the second technique have problems such as simply discarding the communication request message directed to the call control server when the network and the call control server are congested. Therefore, there is a problem that an emergency call such as communication to an important subscriber such as a disaster prevention organization or an important call such as a police fire fighting cannot be protected and communication cannot be made.
JP 2005-167769 A

  The present invention has been made in view of such circumstances, and an object thereof is call control capable of securing a specific subscriber and specific communication even in a state where the network and the call control server are congested. It is to provide a server and its method.

The present invention has been made to solve the above-described problems, and the invention according to claim 1 includes transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal. A call control server that receives a communication request message including a terminal and processes a call of the terminal, and includes subscriber type information that identifies importance in communication of the source terminal in association with the source terminal information in advance. Based on the received terminal data included in the received communication request message, the stored terminal data storage means to hold, the call type information storage means to hold in advance the call type for identifying the communication type in association with the destination terminal information , Based on accommodation terminal data search means for obtaining subscriber type information from the accommodation terminal data storage means, and transmission destination terminal information included in the received communication request message Call type search means for acquiring call type information from the call type information storage means; subscriber type information acquired by the accommodation terminal data search means; call type information acquired by the call type search means; Based on the restriction rule information according to the restriction level, the restriction control means for executing the restriction process for the call of the terminal, and the terminal is placed between the terminal and the call control server. A gateway device that discards a call to or from any terminal, and the accommodation terminal data storage means holds accommodation information for identifying the gateway device, and the restriction control means includes the The accommodation information of the gateway device that accommodates the specific terminal is retrieved from the accommodation terminal data storage means, and the call to the specific terminal or the specific terminal Is sent to the searched gateway device to execute a restriction process on the call of the terminal, and the restriction control means determines which call type based on the restriction rule information according to the restriction level. However, when there is the specific terminal that is restricted for call origination, the instruction information for discarding the call to the specific terminal or the call from the specific terminal is transmitted to the gateway device. Is a call control server characterized by

According to a second aspect of the present invention, a communication request message including transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal is received from the terminal, and the call processing of the terminal is performed. A storage terminal data storage means for preliminarily storing subscriber type information for identifying importance in terminal communication in association with terminal identification information that is terminal identification information, and the received communication request Source subscriber identification information search means for acquiring source subscriber identification information, which is subscriber identification information of a source terminal, from the accommodated terminal data storage means based on the source terminal information included in the message, and the reception Based on the destination terminal information included in the received communication request message, destination subscriber identification information, which is subscriber identification information of the destination terminal, is acquired from the accommodation terminal data storage means. Transmission destination subscriber identification information search means, transmission source subscriber identification information acquired by the transmission source subscriber identification information search means, transmission destination subscriber identification information acquired by the transmission destination subscriber identification information search means, Based on the restriction rule information based on a predetermined restriction level, the restriction control means for executing the restriction process of the call of the terminal, and the terminal and the call control server are arranged, and the terminal is directly accommodated. And a gateway device that discards a call to or from any terminal to be accommodated, and the accommodation terminal data storage means holds accommodation information for identifying the gateway apparatus, and the restriction control means Retrieves the accommodation information of the gateway device that accommodates the specific terminal from the accommodation terminal data storage means, and instructs to discard the call to the specific terminal or the call from the specific terminal By transmitting the information to the searched gateway device, the call restriction process of the terminal is executed, and the restriction control unit is configured to call a call in any call type based on the restriction rule information according to the restriction level. When there is the specific terminal that is restricted for outgoing calls, the instruction information for discarding a call to the specific terminal or a call from the specific terminal is transmitted to the gateway device. It is a call control server.

  According to a third aspect of the present invention, a restriction level information storage means for preliminarily holding restriction rule information for each of a plurality of restriction levels, and a load of the call control server are measured, and a restriction level is detected based on the measured load. And a self-server load measuring means for transmitting the detected restriction level to the restriction control means, wherein the restriction control means is further configured to control the restriction based on the restriction level received from the own server load measurement means. The regulation rule information is selected and acquired from the level information storage means, and the regulation rule information selected and acquired is used as regulation rule information according to the predetermined regulation level. The call control server described.

  The invention according to claim 4 further includes restriction instruction information receiving means for receiving restriction instruction information for restriction including a restriction level from another call control server or an external device, and the restriction control means further comprises: Based on the restriction level received by the restriction instruction information receiving means, the restriction rule information is selected and obtained from the restriction level information storage means, and the restriction rule information obtained by selecting and obtaining the restriction rule information is regulated by the predetermined restriction level. The call control server according to claim 1, wherein the call control server is information.

According to the fifth aspect of the present invention, a communication request message including transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal is received from the terminal, and the call processing of the terminal is performed. Used in a call control server, wherein the call control server is arranged between the terminal and the call control server, and directly accommodates the terminal, or calls to any terminal accommodating A gateway device that abandons a call from a terminal, and subscriber type information that identifies importance in communication of the transmission source terminal in association with the transmission source terminal information, and also holds accommodation information that identifies the gateway device It has a housing terminal data storage means for, and call type information storage means for previously holding a call type identifying the type of communication in association with the destination terminal information, and Based on the source terminal information included in the received communication request message, subscriber type information is obtained from the accommodated terminal data storage means, and based on the destination terminal information included in the received communication request message, the call type Call type information is acquired from an information storage means, and the call restriction processing of the terminal is performed based on the acquired subscriber type information, the acquired call type information, and restriction rule information based on a predetermined restriction level. The call restriction processing of the terminal is performed by retrieving accommodation information of the gateway device that accommodates the specific terminal from the accommodation terminal data storage unit, and calling a call to the specific terminal or a call from the specific terminal. Including a process of executing a call restriction process of the terminal by transmitting instruction information to be discarded to the searched gateway device, The restriction processing is based on the restriction rule information based on the restriction level, and when there is the specific terminal that is restricted for call origination in any call type, the call to the specific terminal or the specific The call control method includes a process of transmitting the instruction information for canceling a call from a terminal to the gateway device .

According to a sixth aspect of the present invention, a communication request message including transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal is received from the terminal, and the call processing of the terminal is performed. Used in a call control server, wherein the call control server is arranged between the terminal and the call control server, and directly accommodates the terminal, or calls to any terminal accommodating A gateway device that discards a call from a terminal, and accommodation information that preliminarily holds subscriber type information that identifies importance in communication of the terminal in association with terminal identification information that is identification information of the terminal, and that identifies the gateway device anda housing terminal data storage means for holding, based on the source terminal information communication request the received message includes the receiving terminal data storage hand Source identification information which is subscriber identification information of the transmission source terminal is acquired from the received terminal request information included in the received communication request message from the accommodated terminal data storage means of the transmission destination terminal Destination subscriber identification information that is subscriber identification information is acquired, and the acquired transmission source subscriber identification information, the acquired transmission destination subscriber identification information, and restriction rule information according to a predetermined restriction level Based on this, the terminal call restriction process is performed . The terminal call restriction process searches the accommodation information of the gateway device accommodating the specific terminal from the accommodation terminal data storage means, and sends it to the specific terminal. Including a process for executing a call restriction process of the terminal by transmitting instruction information for canceling the call of the terminal or a call from a specific terminal to the searched gateway device, The call restriction process is based on the restriction rule information based on the restriction level, and when there is the specific terminal where the call is restricted for any call type, the call to the specific terminal or It is a call control method characterized by including the process which transmits the said instruction information which cancel | discards the call from the said specific terminal to the said gateway apparatus .

  According to the present invention, in the state where the network and the call control server are congested, the outgoing call from the subscriber's terminal is regulated based on the subscriber type and the call type. Server congestion can be prevented, and communication of important subscribers or important calls can be performed even in a state where outgoing calls are regulated.

In the embodiment of the present invention, the call control server accommodates the terminal. Here, the gateway device directly accommodates a plurality of terminals, and the call control server directly accommodates a plurality of gateways.
In the embodiment, between the gateway device and the terminal accommodated in the gateway device, between the call control server and the gateway device accommodated in the call control server, between the call control server and the call control server, The gateway device and the gateway device are connected via a network.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram showing the configuration of a call control system according to an embodiment of the present invention.
In FIG. 1, the gateway device 5 accommodates the terminals 1 and 2, the gateway device 6 accommodates the terminal 3, and the gateway device 7 accommodates the terminal 4.
The call control server 8 accommodates the gateway device 5 and the gateway device 6, and the call control server 9 accommodates the gateway device 7.

The terminal 1 and the gateway device 5 are connected via the network N1, the terminal 2 and the gateway device 5 are connected via the network N2, and the terminal 3 and the gateway device 6 are connected via the network N3. The terminal 4 and the gateway device 7 are connected through the network N4.
The gateway device 5 and the call control server 8 are connected via the networks N6 and N7, and the gateway device 6 and the call control server 8 are connected via the networks N8 and N9 to the gateway device 7 and the call control. The server 8 is connected via the networks N10 and N11.

  The gateway device 5 and the gateway device 6 are connected via the network N5. The call control server 8 and the call control server 9 are connected via the network N12. The external device 10 is connected to the network N12 between the call control server 8 and the call control server 9 via the network N13.

  As described above, the call control server and the gateway device are connected by two separate networks (for example, N6 and N7, N8 and N9, and N10 and N11). Of the networks connecting the call control server and the gateway device, one is used for transmission of a communication request message, and one is used for communication between the gateway device and the call control server. Here, for simplification of description, the network is described as being separated into two separate networks, but actually, the same network can also be configured.

Next, an outline of the operation of the call control system according to the embodiment of the present invention will be described.
Here, for the sake of explanation, it is assumed that the call control server 8 has already executed outgoing restriction of restriction level 1.
First, the terminal 1 transmits a communication request message to the call control server 8.
Next, the call control server 8 that has received the communication request message from the terminal 1 acquires the subscriber identification information and the call type information of the terminal 1 based on the received communication request message.

Here, the subscriber identification information is for identifying the type of the subscriber of the terminal 1, and in the embodiment, each subscriber terminal has several types of subscriber identification information according to importance. It is divided in advance. For example, the subscriber identification information includes a general subscriber, a public telephone, a police, a fire department, and the like.
The call type information is used to identify the type of call. Call type information with high importance is assigned to calls to the police and fire department, and normal calls are used for general calls. Type information is assigned.
The call type information and the subscriber identification information are determined in advance, and are determined by a communication request message from the terminal.

Next, the call control server 8 executes the restriction of the call of the terminal 1 based on the subscriber type information and the call type information and based on the restriction rule determined by the restriction level 1.
For example, the call from the general subscriber to the general subscriber is restricted, but the call from the general subscriber to the police is not restricted. The restriction is performed according to the importance of the call.
Although the description has been made assuming that the restriction level is determined in advance as the restriction level 1, the restriction level is determined according to the congestion state of the call control server 8.
Details of the operation of the call control system according to one embodiment will be described later.

Next, functions of each device will be described.
Terminals 1 to 4 are terminals such as telephone terminals and IP telephone terminals used by subscribers, and subscribers use other terminals to connect other subscribers by connecting calls to terminals owned by other subscribers. Make a call with the person.
Each of the terminals 1 to 4 has a unique identification number for identifying the terminal. Here, the identification number is a telephone number assigned to the terminal or a serial number for identifying the terminal.
The communication request message that the terminal transmits to the call control server at the start of communication includes information identifying the terminal that transmitted the communication request message (source terminal identification information) and information identifying the terminal that is the communication destination. (Destination terminal identification information) is included.

The gateway devices 5 to 7 directly accommodate the terminals and control communication between the terminals and the call control server. Each gateway device is assigned a unique identification number for identifying each gateway device, and the gateway device is identified by the identification number.
Each of the gateway devices 5 to 7 has a function of discarding all IP packets transmitted from the terminal and all IP packets addressed to the terminal for each terminal accommodated.

The call control servers 8 and 9 control calls from or to the terminal via the gateway device. The call is connected to another call control server based on the destination terminal identification information received from the terminal.
Details of the call control servers 8 and 9 will be described later.

The external device 10 monitors the load status of the call control servers 8 and 9 and displays the load status of each call control server on the display device of the external device 10 to the network administrator. Also, for example, input of restriction instruction data from a network administrator is accepted via the input device of the external device 10 and transmitted to the call control servers 8 and 9 as restriction instruction information. Here, the regulation instruction information includes a regulation level (regulation level).
Here, the restriction level of the restriction instruction information transmitted from the external device 10 is determined by the network administrator looking at the display device, determining the restriction level from the load status of each call control server, and inputting it using the input device. It is.

  For example, the gateway devices are connected by a network N5. In an IP phone, a communication request message and audio / video data are processed separately. Since the call control server controls the call, the communication request message passes through the call control server, but the audio / video data is exchanged between terminals via the gateway device only, not through the call control server. Is done. In this way, the network N5 that connects the gateway devices transmits audio / video data communicated between the terminals.

Next, an example of the configuration of the call control servers 8 and 9 is shown in FIG.
The call control servers 8 and 9 have their own server load measurement unit 21, restriction request reception unit 22, call type detection unit 23, accommodation terminal data storage unit 24, accommodation terminal data search unit 25, restriction level information storage unit 26, restriction control. Part 27, restriction execution part 28, restriction request transmission part 29, and call type information storage part 30.

The own server load measurement unit 21 constantly monitors the load of the call control server itself, and when the load of the call control server itself exceeds a predetermined threshold, the restriction instruction information for instructing restriction is sent to the restriction control unit 27 described later. Send.
In addition, the server load measurement unit 21 detects a plurality of restriction levels. For example, the threshold value of the load for detecting a plurality of predetermined regulation levels is set as threshold value 1 and threshold value 2 (where threshold value 1 <threshold value 2). Here, when the load of the call control server measured by the own server load measuring unit 21 is less than the threshold value 1, there is no restriction. In this case, the restriction level is detected as restriction level 2. Next, the server load measurement unit 21 transmits the restriction instruction information including the detected restriction level to the restriction control unit 27.

  The restriction request receiving unit 22 receives restriction instruction information, which is a request for outgoing restriction, transmitted from another call control server or the external device 10. Here, the restriction instruction information received by the restriction request receiving unit 22 includes a restriction level.

The call type detection unit 23 detects the call type from the communication request message from the terminal, and transmits information on the detected call type (call type information) to the restriction control unit 27 described later.
As the call type detection performed by the call type detection unit 23, for example, an emergency call to the police whose destination telephone number is 101 and an emergency call to 109 fire fighters are detected as the third type call type from the destination terminal identification information. To do. Further, for example, it is detected from the destination terminal identification information that the destination telephone number is a disaster type telephone number, so that it is detected as a second type call type, and the destination telephone number is a general subscriber telephone number. It is detected as a kind call type.

  For example, as shown in FIG. 3, the destination terminal identification information and the call type information are associated with each other and stored in advance in the call type information storage unit 30. Next, when receiving the communication request message from the terminal, the call type detection unit 23 receives the call type information from the call type information storage unit 30 based on the destination terminal identification information included in the communication request message from the terminal. Search for and get.

Further, for example, as shown in FIG. 3, the stored call control server information for identifying the call control server that stores the destination terminal is stored in advance in the call type information storage unit 30 in association with the destination terminal identification information. You may keep it.
Thereby, the call control server acquires the accommodated call control server information from the call type information storage unit 30 based on the destination terminal identification information, and the call accommodating the destination terminal based on the acquired accommodated call control server information. The call can be transferred to the control server.

  The accommodation terminal data storage unit 24 stores accommodation terminal data in advance. Here, the accommodation terminal data includes, for example, as shown in FIG. 4, the subscriber type information of the subscriber owning the terminal associated with the identification number of the transmission source terminal (transmission source terminal identification number), the terminal Is information with the accommodation information for identifying the gateway device that directly accommodates.

  The accommodation terminal data retrieval unit 25 retrieves the subscriber type information and the accommodation information from the accommodation terminal data storage unit 24 based on the transmission source terminal identification information included in the communication request message from the terminal, and the retrieved subscriber type information And the accommodation information are transmitted to a restriction control unit 27 described later.

The restriction level information storage unit 26 stores information (regulation rule information) relating to the availability of outgoing calls determined by the subscriber type information and the call type information for each of the plurality of restriction levels.
Here, there are three types of subscriber types: first-class subscribers, second-class subscribers, third-class subscribers, and three types of call types: first-class calls, second-class calls, and third-class calls. It explains as being. The description will be made assuming that there are two types of restriction levels.

Here, a case where two types of restriction levels, restriction level 1 and restriction level 2, are stored in the restriction level information storage unit 26 will be described.
For example, as shown in FIG. 5 (A), the content of restriction level 1 is that the first type call cannot be made, the second type call can be made, and the second type call can be made. It is assumed that the call made by the subscriber and the third type subscriber is the regulation rule information that can be sent in all call types.
In addition, as shown in FIG. 5B, the contents of the restriction information of restriction level 2 are that the first-type call cannot be made and the second-type call cannot be made with respect to the call made by the first-type subscriber and the second-type subscriber. It is assumed that the type call and the type 3 call are allowed to be sent, and the call made by the type 3 subscriber is the regulation rule information that can be sent in all call types.
Here, in FIG. 5 (A) and FIG. 5 (B), “◯” means that transmission is possible, and “x” means that transmission is not possible.
The number of types of subscribers and call types and the contents of the restriction rule information at each restriction level are defined for the sake of simplicity of explanation and can be arbitrarily set in practice.

Returning to FIG. 2, the regulation control unit 27 receives regulation instruction information including the regulation level from the server load measurement unit 21 and the regulation request reception unit 22, and performs regulation based on the received regulation instruction information. And the restriction rule information of the decided restriction level is acquired from the restriction level information storage unit 26.
Further, the restriction control unit 27 includes a call type detected by the call type detection unit 23 from the communication request message from the terminal, a subscriber type information and accommodation information from the communication request message from the terminal by the accommodation terminal data search unit 25, Based on the restriction rule information acquired from the restriction level information storage unit 26, the call restriction of the terminal is executed using the restriction execution unit 28.

  For example, if the restriction control unit 27 determines that the restriction level is 1, the communication request message received from the terminal based on the restriction rule information of the restriction level 1 shown in FIG. If the call is a first-class call made by a person, it is determined that the call cannot be made, and the restriction is executed using the restriction execution unit 28.

Here, the determination of the regulation level performed by the regulation control unit 27 includes the regulation level currently executed by the regulation control unit 27, the regulation level of the regulation instruction information received from the own server load measurement unit 21, and the regulation request reception. The level of restriction to be executed is determined based on the restriction level of the restriction instruction information received from the unit 22.
For example, the restriction control unit 27 includes the restriction level currently being executed by the restriction control unit 27, the restriction level of the restriction instruction information received from the own server load measurement unit 21, and the restriction instruction information received from the restriction request receiving unit 22. Among the regulation levels, the level with the highest regulation level is selected, and regulation is executed based on the selected regulation level.

  When the restriction control unit 27 receives the restriction instruction information from the server load measurement unit 21 or receives the restriction instruction information from the restriction request reception unit 22, the restriction control unit 27 uses a restriction request transmission unit 29 described later. The restriction instruction information including the restriction level is transmitted to another call control server or to the external device 10.

In addition, the restriction control unit 27 can execute restriction by discarding all IP packets transmitted from a specific terminal and all IP packets addressed to the terminal by using the gateway device.
For example, the restriction control unit 27 performs the restriction using the gateway device. For example, the restriction control unit 27 first sends all IP packets transmitted from the terminal and all IP packets addressed to the terminal with respect to a specific terminal. When it is determined to be discarded, the gateway device that accommodates the specific terminal is identified from the accommodation information from the accommodation terminal data search unit 25. Next, the restriction control unit 27 sends the instruction information for discarding all the IP packets transmitted from the terminal and all the IP packets addressed to the terminal to the specific terminal to the gateway device specified by the accommodation information. Then, the data is transmitted via the restriction execution unit 28. Next, based on the received instruction information, the gateway apparatus discards all of the IP packets transmitted from the terminal and all of the IP packets addressed to the terminal with respect to the specific terminal. As described above, the restriction using the gateway device performed by the restriction control unit 27 is executed.

The restriction using such a gateway is, for example, that the restriction rule information at the restriction level determined by the restriction control unit 27 is the first type subscriber of any call type as shown in FIG. This can be applied when restrictions are placed on outgoing calls.
As in the restriction rule information shown in FIG. 5 (C), in any call type, when restriction is placed on the transmission of the call of the first type subscriber, the restriction control unit 27 sets all of the first type subscribers. The terminal identification number and the accommodation information are acquired from the accommodation terminal data 24, and the terminals of the respective first type subscribers are accommodated so as to discard all the IP packets transmitted by the obtained first type subscriber terminals. The restriction instruction information is transmitted to each gateway device using the restriction execution unit 28, and the gateway device executes restriction for each terminal.

  Based on the restriction level determined by the restriction control unit 27, the restriction request transmission unit 29 transmits restriction instruction information for executing a restriction request including information on the restriction level to another call control server or to an external device.

Next, the operation of the call control system according to the embodiment of the present invention will be described with reference to FIG.
In the call control system according to the embodiment of the present invention shown in FIG. 1, SIP (Session Initiation Protocol) is used as a call control protocol, RTP (Real-time Transport Protocol) is used as a voice data transmission protocol, and a gateway by a call control server is used. H. for controlling the device. 248 / Megaco (Media Gateway Control) protocol is used.
In FIG. 1, networks Nl, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, and N13 are IP networks.

  Here, as shown in FIG. 4, the type of the subscriber who owns the terminal 1 is the first type subscriber, the type of the subscriber who owns the terminal 2 is the second type subscriber, and the subscriber who owns the terminal 3 The type is a third-class subscriber.

First, the restriction request receiving unit 23 of the call control server 8 receives restriction instruction information of restriction level 1 from the outside (for example, the call control server 9 or the external device 10) (step S61).
Next, the terminal 1 requests a connection to the terminal 4 accommodated in another call control server (call control server 9) via the gateway device 5 to the call control server 8 in which the terminal 1 is accommodated. The SIP message is transmitted as a communication request message (step S62).
The communication request message transmitted from the terminal 1 includes the identification number of the terminal 1 as the transmission source terminal identification information and the identification number of the terminal 4 as the transmission destination terminal identification information.

The accommodated terminal data search unit 25 of the call control server 8 retrieves the accommodated terminal data 24 (see FIG. 4) based on the identification number of the terminal 1, which is the transmission source terminal identification information included in the communication request message received from the terminal 1. Then, the subscriber type information of the terminal 1 is acquired as being a first-class subscriber (step S63), the accommodation information of the terminal 1 is acquired, and the acquired subscriber type information and the accommodation information are converted into the restriction control unit 27. Send to.
On the other hand, the call type detection unit 23 of the call control server 8 searches for the call type from the call type information storage unit 30 (see FIG. 3) based on the destination terminal identification information included in the communication request message received from the terminal 1. (Step S64). In this case, since the destination terminal identification information is the terminal 4, the call type information is acquired as the first type call. Next, the call type detection unit 23 transmits the acquired call type to the restriction control unit 27.

Next, the restriction control unit 27 receives the subscriber type information and the accommodation information from the accommodation terminal data search unit 25 and receives the call type from the call type detection unit 23. Further, the restriction control unit 27 obtains restriction instruction information of restriction level 1 from the restriction request reception unit 23, and obtains restriction rule information of restriction level 1 from the restriction level information storage unit 26 (see FIG. 5).
Next, the restriction control unit 27 detects whether or not to execute restriction based on the acquired call type, subscriber type information, and restriction level 1 restriction rule information (step S65).

  In this case, the subscriber type information of terminal 1 which is the transmission source terminal identification information acquired in step S63 is the first type subscriber, and the call type information of terminal 4 which is the transmission destination terminal identification information acquired in step S64 is In the regulation rule information of the regulation type 1 that is a first type call, the first type call transmitted by the first type subscriber is subject to regulation, so the regulation control unit 27 of the call control server 8 executes regulation. The communication request message from the terminal 1 is discarded (step S66).

  On the other hand, the SIP message for requesting connection to the terminal 4 accommodated in another call control server is transmitted to the call control server 8 accommodated by the terminal 2 via the gateway device 5 as a communication request message. Suppose you send. Here, unlike the terminal 1, the subscriber type information of the terminal 2 is a second type subscriber.

  In this case, the subscriber type information of terminal 2 which is the transmission source terminal identification information acquired in step S63 is the second type subscriber, and the call type information of terminal 4 which is the transmission destination terminal identification information acquired in step S64 is In the restriction rule information of restriction level 1 for the first type call, since the first type call transmitted by the second type subscriber is not subject to restriction, the restriction control unit 27 of the call control server 8 executes restriction. The communication request message from the terminal 1 is processed as usual, and the terminal 4 that is the communication partner terminal is connected (step S67).

In the embodiment, the accommodation terminal data 24 and the call type information storage unit 30 have been described as being separate from each other. However, this may be common. For example, as shown in FIG. 7, subscriber type information, accommodation information, call type information, and accommodation call control server information may be stored as an accommodation terminal DB in association with terminal identification information. .
Thus, when storing subscriber type information and accommodation information from the source terminal identification information, the terminal identification information that matches the source terminal identification information is searched from the accommodation terminal DB. You may make it acquire the subscriber classification information and accommodation information linked | related with the searched terminal identification information.
Further, when the call type information and the accommodated call control server information are retrieved from the destination terminal identification information and stored in the accommodation terminal DB in this way, the terminal identification information that matches the destination terminal identification information is retrieved from the accommodation terminal DB. And the call type information and the accommodated call control server information associated with the searched terminal identification information may be acquired.

  In the embodiment, each call control server has been described as having the accommodation terminal data 24 and the call type information storage unit 30 in advance, but each call control server has the accommodation terminal data 24. And the call type information storage unit 30 are not necessary, and the accommodation terminal data 24 and the call type information storage unit 30 are external to the respective call control servers, and are connected from the respective call control servers via the network. You may do it.

As described above, the accommodation terminal data 24 and the call type information storage unit 30 are collectively used as the accommodation terminal DB, and are connected to the accommodation terminal DB from the respective call control servers via the network. May be configured to search subscriber type information, accommodation information, and call type information from the accommodation terminal DB based on the terminal identification information of the transmission source terminal identification information or the transmission destination terminal identification information.
In this case, the accommodation terminal DB may be a database server having a communication function so that it can communicate with the call control server via the network.
Each call control server may also have a communication function for communicating with the accommodation terminal DB.

As an embodiment of the present invention, description has been made assuming that whether or not restriction is determined by call type information and subscriber type information for each restriction level. However, the present invention is not limited to this. Based on the subscriber type information of the original terminal and the subscriber type information of the destination terminal, regulation rule information for each regulation level is determined, and based on the regulation rule information selected according to the regulation level, the regulation You may make it detect propriety.
For example, as shown in FIG. 8 (A) and FIG. 8 (B), two restriction levels are classified into subscriber type information (source subscriber type information) of the transmission source terminal and subscriber type information (transmission) of the transmission destination terminal. And pre-subscriber type information).
Next, when the communication request message is received from the terminal, the source subscriber type information and the destination subscriber type information are searched based on the source terminal identification information and the destination terminal identification information of the communication request message. Then, whether or not restriction is possible is detected based on the retrieved transmission source subscriber type information and transmission destination subscriber type information and the restriction rule information shown in FIG. 8A or FIG. 8B. Good.

  The call type information may be included in the communication request message, and the call control server may determine the call type by extracting the call type information from the received communication request message.

  Note that the call control server issues an instruction to the gateway device to restrict the call originating from the specific terminal and the incoming call to the specific terminal, and the gateway device originates the call from the specific terminal, In addition, to restrict incoming calls to a specific terminal, the call control server monitors the call volume from and to a specific terminal, and the call volume at a certain time is more than a predetermined value. You may make it perform when it becomes large.

  In the embodiment of the present invention, the call control server has been described as including a congestion control device. However, the present invention is not limited to this, and the call control server and the congestion control device are connected to each other. It is also possible to separate them.

  In addition, an input device, a display device, and the like (none of which are shown) are connected to the external device 10 as peripheral devices. Here, the input device refers to an input device such as a keyboard and a mouse. The display device refers to a CRT (Cathode Ray Tube), a liquid crystal display device, or the like.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

  The present invention is suitable for use in a call control system in which congestion may occur.

It is a block diagram which shows the structure of the call control system by one embodiment of this invention. It is a block diagram which shows the structure of the call control server in one embodiment. It is explanatory drawing which shows an example of the content memorize | stored in a call classification information storage part. It is explanatory drawing which shows an example of the content memorize | stored in accommodation terminal data. It is explanatory drawing which shows an example of the content memorize | stored in a control level information storage part. It is a flowchart figure which shows operation | movement of the call control system by one Embodiment of this invention. It is explanatory drawing which shows an example of the content memorize | stored in accommodation terminal DB. It is explanatory drawing which shows an example of the content memorize | stored in the control level information storage part of another form. It is a block diagram which shows the structure of a 1st conventional call control system. It is a block diagram which shows the structure of the conventional congestion control apparatus. It is a block diagram which shows the structure of the 2nd conventional call control system. It is a flowchart figure which shows operation | movement of the 2nd conventional call control system.

Explanation of symbols

1, 2, 3, 4 Terminals 5, 6, 7 Gateway device 8, 9 Call control server 10 External device 21 Own server load measuring unit 22 Restriction request receiving unit 23 Call type detecting unit 24 Accommodating terminal data storage unit 25 Accommodating terminal data Search unit 26 Regulation level information storage unit 27 Regulation control unit 28 Regulation execution unit 29 Regulation request transmission unit 30 Call type information storage unit 1001, 1002, 1003, 1004 Terminal 1005, 1006 Call control server 1007, 1008 Congestion control device 1009 Aggregation device 2002 processing load measurement unit 2003 load threshold management unit 2004 regulation control unit 2005 own server originating load measuring unit 2006 other server originating load measuring unit 2007 regulation request sending unit 2008 regulation enforcement unit 2009 regulation request receiving unit 3001, 3002, 3006 terminal 3003, 300 The gateway device 3005 call control server

Claims (6)

A call control server for receiving a communication request message including transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal from the terminal, and processing the call of the terminal;
Accommodating terminal data storage means for preliminarily holding subscriber type information for identifying importance in communication of a transmission source terminal in association with transmission source terminal information;
Call type information storage means for holding in advance a call type for identifying the type of communication in association with the destination terminal information;
Based on transmission source terminal information included in the received communication request message, accommodated terminal data search means for acquiring subscriber type information from the accommodated terminal data storage means,
Call type search means for obtaining call type information from the call type information storage means based on destination terminal information included in the received communication request message;
Based on the subscriber type information acquired by the accommodated terminal data search means, the call type information acquired by the call type search means, and the restriction rule information based on a predetermined restriction level, the call restriction processing of the terminal Regulation control means for executing
A gateway device disposed between the terminal and the call control server, directly accommodating the terminal, and discarding a call to or from any terminal accommodated;
Have
The accommodation terminal data storage means holds accommodation information for identifying the gateway device;
The restriction control means retrieves accommodation information of the gateway device accommodating a specific terminal from the accommodation terminal data storage means, and searches the instruction information to discard a call to a specific terminal or a call from a specific terminal. By performing a call restriction process on the terminal by transmitting it to the gateway device that accommodates the specific terminal .
The regulation control means is
Based on the restriction rule information based on the restriction level, in any call type, when there is the specific terminal that is restricted for outgoing calls, a call to the specific terminal or a call from the specific terminal Transmitting the instruction information for discarding the call to the gateway device accommodating the specific terminal ;
Call control server characterized by that. A call control server for receiving a communication request message including transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal from the terminal, and processing the call of the terminal;
Accommodating terminal data storage means for preliminarily holding subscriber type information for identifying importance in terminal communication in association with terminal identification information that is terminal identification information;
Source subscriber identification information search for acquiring source subscriber identification information which is subscriber identification information of a source terminal from the accommodation terminal data storage means based on source terminal information included in the received communication request message Means,
Destination subscriber identification information search for acquiring transmission destination subscriber identification information which is subscriber identification information of a transmission destination terminal from the accommodation terminal data storage means based on transmission destination terminal information included in the received communication request message Means,
Transmission source subscriber identification information acquired by the transmission source subscriber identification information search means, transmission destination subscriber identification information acquired by the transmission destination subscriber identification information search means, and restriction rule information according to a predetermined restriction level And a restriction control means for executing a restriction process for the call of the terminal, based on
A gateway device disposed between the terminal and the call control server, directly accommodating the terminal, and discarding a call to or from any terminal accommodated;
Have
The accommodation terminal data storage means holds accommodation information for identifying the gateway device;
The restriction control means retrieves accommodation information of the gateway device accommodating a specific terminal from the accommodation terminal data storage means, and searches the instruction information to discard a call to a specific terminal or a call from a specific terminal. By performing a call restriction process on the terminal by transmitting it to the gateway device that accommodates the specific terminal .
The regulation control means is
Based on the restriction rule information based on the restriction level, in any call type, when there is the specific terminal that is restricted for outgoing calls, a call to the specific terminal or a call from the specific terminal Transmitting the instruction information for discarding the call to the gateway device accommodating the specific terminal ;
Call control server characterized by that. Restriction level information storage means for preliminarily holding restriction rule information for each of a plurality of restriction levels;
Self-server load measuring means for measuring the load of the call control server, detecting a restriction level based on the measured load, and transmitting the detected restriction level to the restriction control means;
Have
The restriction control means further selects and acquires restriction rule information from the restriction level information storage means based on the restriction level received from the own server load measurement means, and selects and obtains the restriction rule information acquired in advance. Use the regulation rule information according to the defined regulation level.
The call control server according to claim 1 or 2, characterized by the above. Restriction instruction information receiving means for receiving restriction instruction information for restriction including a restriction level from another call control server or an external device;
Have
The restriction control means further selects and acquires restriction rule information from the restriction level information storage means based on the restriction level received by the restriction instruction information receiving means, and the restriction rule information selected and obtained is obtained in advance. Use the regulation rule information according to the defined regulation level.
The call control server according to any one of claims 1 to 3, wherein A method used in a call control server for receiving a communication request message including transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal from the terminal and processing the call of the terminal Because
The call control server is
A gateway device disposed between the terminal and the call control server, directly accommodating the terminal, and discarding a call to or from any terminal accommodated;
Accommodating terminal data storage means for preliminarily storing subscriber type information for identifying importance in communication of a transmission source terminal in association with transmission source terminal information, and holding accommodation information for identifying the gateway device;
Call type information storage means for holding in advance a call type for identifying the type of communication in association with the destination terminal information;
Have
Based on the source terminal information included in the received communication request message, obtain subscriber type information from the accommodation terminal data storage means,
Based on the destination terminal information included in the received communication request message, obtain call type information from the call type information storage means,
Based on the acquired subscriber type information, the acquired call type information, and restriction rule information according to a predetermined restriction level, the terminal call restriction process is executed,
The terminal call restriction process is as follows:
The accommodation information of the gateway device that accommodates the specific terminal is retrieved from the accommodation terminal data storage means, and the specific terminal that has retrieved the instruction information for discarding the call to the specific terminal or the call from the specific terminal is accommodated Including a process of executing a call restriction process of the terminal by transmitting to the gateway device
The terminal call restriction process is as follows:
Based on the restriction rule information based on the restriction level, in any call type, when there is the specific terminal that is restricted for outgoing calls, a call to the specific terminal or a call from the specific terminal Including a process of transmitting the instruction information for discarding a call to a gateway apparatus accommodating the specific terminal ,
A call control method characterized by the above. A method used in a call control server for receiving a communication request message including transmission source terminal information for identifying a transmission source terminal and transmission destination terminal information for identifying a transmission destination terminal from the terminal and processing the call of the terminal Because
The call control server is
A gateway device disposed between the terminal and the call control server, directly accommodating the terminal, and discarding a call to or from any terminal accommodated;
A terminal data storage means for holding subscriber type information for identifying importance in communication of a terminal in association with terminal identification information which is terminal identification information, and holding accommodation information for identifying the gateway device;
Have
Based on the transmission source terminal information included in the received communication request message, obtain transmission source subscriber identification information that is subscriber identification information of the transmission source terminal from the accommodated terminal data storage means,
Based on the destination terminal information included in the received communication request message, obtain destination subscriber identification information that is subscriber identification information of the destination terminal from the accommodation terminal data storage means,
Based on the acquired transmission source subscriber identification information, the acquired transmission destination subscriber identification information, and restriction rule information according to a predetermined restriction level, the call restriction process of the terminal is executed,
The terminal call restriction process is as follows:
The accommodation information of the gateway device that accommodates the specific terminal is retrieved from the accommodation terminal data storage means, and the specific terminal that has retrieved the instruction information for discarding the call to the specific terminal or the call from the specific terminal is accommodated Including a process of executing a call restriction process of the terminal by transmitting to the gateway device
The terminal call restriction process is as follows:
Based on the restriction rule information based on the restriction level, in any call type, when there is the specific terminal that is restricted for outgoing calls, a call to the specific terminal or a call from the specific terminal Including a process of transmitting the instruction information for discarding a call to a gateway apparatus accommodating the specific terminal ,
A call control method characterized by the above.

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