JP2008301036A - Method for regulating incoming call, switching apparatus and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate incoming calls in real-time bidirectional communication between terminals through an IP network. <P>SOLUTION: A communication system mediates real-time bidirectional communication through the IP network 3, provides service to the terminals, stores receiving tolerance per prescribed time into a storage part, and when a call connection request is received from the terminal, counts up a receiving counter value which is the number of call connection requests received within the prescribed time, when the counted-up receiving count value is a value larger than the receiving tolerance, does not permit service start to the terminal transmitting the call connection request, and when the counted-up receiving counter value is a value smaller than the receiving tolerance, permits service start to the terminal transmitting the call connection request. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an incoming call restriction method, a switching apparatus, and a communication system.

  SIP exchange apparatus, which is an exchange apparatus in communication using SIP (Session Initiation Protocol: see Non-Patent Document 1, for example), which is a protocol for establishing a session between terminals on an IP (Internet protocol) network such as the Internet Is an exchange device for securing a communication line between SIP user terminals.

  In a general telephone exchange device, when a large number of call connections are requested in a short time due to a disaster or an event ticket reservation, the telephone exchange device becomes congested, resulting in service down or system down. In order to avoid such a situation, a general telephone exchange apparatus regulates some of a large number of call connection request signals and adjusts the amount of call connection request signals input to the telephone exchange apparatus. Congestion control function is provided. This function is generally called an incoming call restriction function, and is an important function that is also adopted in the SIP exchange apparatus. As an incoming call restriction function of a SIP exchange device, it is common to determine whether or not restriction is necessary for a telephone call connection request signal (INVITE request) for a user to start using a telephone service.

In recent years, the capacity of SIP exchange devices has been increased, and the number of subscribers accommodated continues to increase. In addition, services provided by SIP exchange devices are diversified, and in addition to telephone connection services, current location information effect services (presence services), instant message services such as chat, and the like have been provided. .
In SIP, a REGISTER request for an IP phone, a SUBSCRIBE request, a PUBLISH request, etc. for a presence service, and a MESSAGE request for an instant message such as chat are specified.
In this specification, a request for each service in a communication system using SIP such as a REGISTER request, a MESSAGE request, an INVITE request, a SUBSCRIBE request, and a PUBLISH request is collectively referred to as a SIP request.

Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M. and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, June 2002.

The SIP user terminal transmits a SIP request for requesting registration of the current location of the SIP user terminal to the SIP switching apparatus in order to receive a request notification from the SIP switching apparatus when the service is received.
Normally, this SIP request is transmitted to the SIP exchange apparatus periodically, for example, every 30 minutes, but may also be transmitted when the power of the SIP user terminal is turned on.

Therefore, for example, when a power failure occurs, there is a possibility that all SIP user terminals existing in the area at the time of recovery from the power failure will transmit SIP requests all at once. There is a growing need to provide functionality.
An object of the present invention is to solve such a problem.

  In order to solve the above-described problems, an incoming call restriction method, an exchange device, and a communication system according to the present invention mediate real-time bidirectional communication between terminals via an IP network, provide services to the terminals, and a storage unit. When a call connection request is received from a terminal, the reception counter value that is the number of call connection requests received within a predetermined time is counted up, and the counted up reception counter value If the value is larger than the reception allowable amount, the service start with the terminal that has transmitted the call connection request is not permitted, and the counted up reception counter value is smaller than the reception allowable amount. It is characterized by permitting service start with a terminal that has transmitted a request.

  ADVANTAGE OF THE INVENTION According to this invention, the incoming call control method, switching apparatus, and communication system which perform incoming call control in the real-time two-way communication between terminals via an IP network can be provided.

  DESCRIPTION OF EMBODIMENTS Embodiments of an incoming call restriction method, an exchange device, and a communication system according to the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a configuration example of a SIP system according to the first embodiment.
The SIP system A (communication system) secures a line for communication between a plurality of SIP user terminals 2 (terminals) that perform communication based on SIP and the SIP user terminals 2, and SIP requests (call connection requests). SIP switching device 1 (switching device) that performs the above-described regulation and the like, and an IP network 3 that is a communication line between each SIP user terminal 2 and the SIP switching device 1.
The SIP user terminal 2 may be any device that performs communication based on SIP, and for example, a PC 2 ′ (Personal Computer), an IP phone 2 ″, or the like is used.

FIG. 2 is a functional block diagram showing a configuration example of the SIP exchange apparatus according to the first embodiment.
The SIP exchange device 1 includes an application layer processing unit 10 that processes application layer level information in SIP, a transaction layer processing unit 20 that processes transaction layer level information, and a transport layer processing unit that processes transport layer level information. 30 and a storage unit 15 for storing various information. The transaction layer processing unit 20 is connected to the application layer processing unit 10 and the transport layer processing unit 30. The storage unit 15 is connected to the application layer processing unit 10.

The application layer processing unit 10 includes a signal distribution unit 11 that regulates a transmitted SIP request, a service processing unit 12 that performs service processing, a user data unit 13 that stores information about users, and user authentication. A user authentication unit 14 is provided.
The signal distribution unit 11, the service processing unit 12, the user data unit 13, and the user authentication unit 14 are connected to each other.

FIG. 3 is a functional block diagram illustrating a configuration example of the signal distribution unit according to the first embodiment.
The signal distribution unit 11 includes a SIP request restriction processing unit 111 (call connection request restriction determination processing unit) that restricts incoming calls of SIP requests, and a SIP signal transmission / reception processing unit 112 (signals) that transmits and receives SIP signals including SIP requests. Transmission / reception processing unit).
The SIP request restriction processing unit 111 includes a counter reset processing unit 1111 that performs a counter reset process that will be described later with reference to FIG. 7, and a SIP request restriction determination processing unit 1112 that performs a SIP request restriction determination process that will be described later with reference to FIG. Have

FIG. 4 is a diagram illustrating an example of the SIP request restriction condition table stored in the storage unit.
As shown in FIG. 4, the SIP request restriction condition table stores restriction values (reception allowances) corresponding to SIP request types.
Here, the regulation value is an allowable input amount of each SIP request per predetermined time.
For example, the REGISTER request allows input up to “150” per predetermined time, and when it exceeds this, incoming call restriction is performed. Similarly, subsequent to the INVITE request,..., PUBLISH request, the MESSAGE request allows input up to “50” per unit time, and if it exceeds this, incoming call restriction is performed.
When the SIP request type is response information such as ACK or BYE, a restriction value of “−1” is associated. Thus, when the restriction value is “−1”, it means that the incoming call restriction is not performed for the corresponding type of SIP request.

FIG. 5 is a diagram illustrating an example of the SIP request reception counter table stored in the storage unit.
As shown in FIG. 5, the SIP request reception counter table stores reception counter values corresponding to SIP request types.
Here, the reception counter value is the number of times a corresponding type of SIP request has been received. That is, when a SIP request is received, the SIP request restriction determination processing unit 1112 increments the reception counter value corresponding to the corresponding type of SIP request by +1. However, the reception counter value is reset by the counter reset processing unit 1111 after a predetermined time (counter reset cycle time) (described later with reference to FIG. 7).

(SIP request restriction determination processing)
Next, SIP request restriction determination processing according to the first embodiment will be described along FIG. 6 with reference to FIGS. 1 and 3 to 5.
FIG. 6 is a flowchart showing the flow of SIP request restriction determination processing (incoming call restriction method) according to the first embodiment.
The SIP user terminal 2 transmits a SIP request to the SIP exchange device 1 (S101).
The SIP signal transmission / reception processing unit 112 of the SIP exchange apparatus 1 that has received the SIP request makes a SIP request restriction determination request to the SIP request restriction determination processing part 1112 (S102).
The SIP request restriction determination processing unit 1112 requested to make the SIP request restriction determination refers to the restriction value of the corresponding request type in the SIP request restriction condition table in the storage unit 15, and whether the restriction value is −1, − It is determined whether the value is greater than 1 (S103).
If the restriction value is −1 as a result of step S103 (S103 → restriction value = −1), the SIP request restriction determination processing unit 1112 outputs “permitted” as the determination result (S104), and the SIP signal transmission / reception processing unit In step 112, the process proceeds to step S108.

As a result of step S103, when the restriction value is larger than −1 (S103 → restriction value> −1), the SIP request restriction determination processing unit 1112 refers to the SIP request reception counter table in the storage unit 15 and applies. The reception counter value to be added is incremented by 1 (S105).
Next, the SIP request restriction determination processing unit 1112 determines whether or not the reception counter value is larger than the restriction value referred in step S103 (S106).
If the reception counter value is not greater than the restriction value as a result of step S106 (S106 → No), the SIP request restriction determination processing unit 1112 executes the process of step S104 and outputs “permitted” as the determination result.
As a result of step S106, when the reception counter value is larger than the restriction value (S106 → Yes), the SIP request restriction determination processing unit 1112 outputs “restriction” as the determination result (S107).

Next, the SIP request restriction determination processing unit 1112 returns a SIP request restriction determination response including the determination result output in step S104 or step S107 to the SIP signal transmission / reception processing unit 112 (S108).
Then, the SIP signal transmission / reception processor 112 determines whether the determination result included in the SIP request restriction determination response is “restriction” or “permitted” (S109).
If the result of step S109 is “regulation” (S109 → regulation), the SIP signal transmission / reception processing unit 112 responds to the corresponding SIP user terminal 2 with a 503 response that is a response signal with a response code of 503 (service not available). A signal is transmitted (S110). That is, the SIP exchange device 1 does not permit the service start to the SIP user terminal that has transmitted the SIP request.
If the result of step S109 is “permitted” (S109 → allowed), the SIP signal transmission / reception processing unit 112 requests each of the application processing units 12 to 14 to distribute a SIP request (S111). That is, the SIP exchange apparatus 1 permits the service start to the SIP user terminal 2 that has transmitted the SIP request.

  If the result of step S109 is “regulation”, the SIP request is not distributed to the respective units 11 to 14 in the application layer processing unit 10 of the SIP exchange apparatus 1, and the SIP user terminal 2 and the transmission request destination session Is not established. That is, since the processes of the units 11 to 14 in the application layer processing unit 10 are not performed, an increase in the usage amount of the CPU can be suppressed.

(Counter reset processing)
Next, the counter reset processing according to the first embodiment will be described along FIG. 7 with reference to FIGS. 3 and 5.
FIG. 7 is a flowchart showing the flow of counter reset processing according to the first embodiment.
Note that the processing in FIG. 7 is started as soon as the power of the SIP exchange device 1 is turned on, and ends when the power is turned off.
First, the counter reset processing unit 1111 refers to the counter reset cycle time stored in advance in the storage unit 15 (S201).
Then, the counter reset processing unit 1111 waits for the referenced counter reset cycle time (S202).
After the counter reset time has elapsed, the counter reset processing unit 1111 resets all the counter values in the SIP request reception counter table stored in the storage unit 15 to 0 (S203). And the counter reset process part 1111 returns to the process of step S201.

(Effect of 1st Embodiment)
According to the first embodiment, it is possible to restrict incoming calls of SIP requests in the SIP system A. For example, even if SIP request congestion occurs due to simultaneous activation of the SIP user terminals 2 after a power failure recovery, It is possible to prevent the SIP exchange device 1 from going down service or system down.
Further, as shown in FIGS. 4 and 5, by setting a restriction value for each SIP request type and managing the reception counter value, unified incoming call restriction corresponding to the SIP request type becomes possible. That is, unlike a normal telephone line, the SIP system A uses various SIP requests as shown in FIG. 4 and FIG. 5, but by setting a restriction value for each SIP request type and managing a reception counter value, It becomes possible to centrally manage the incoming call restrictions of these SIP requests.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
In addition, about 2nd Embodiment, about the element similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
FIG. 8 is a functional block diagram illustrating a configuration example of the signal distribution unit according to the second embodiment.
3 is different from the signal distribution unit 11a shown in FIG. 3 in that a CPU usage rate management processing unit 113 that changes a regulation value according to a usage rate of a CPU (Central Processing Unit) is added to the SIP request restriction processing unit 111a. Is a point.

FIG. 9 is a diagram illustrating an example of a restriction state determination condition table according to the second embodiment.
As shown in FIG. 9, in the restriction state determination condition table, primary restriction and secondary restriction are set, and an activation threshold value and a release threshold value are set according to the CPU usage rate (unit is%, respectively).
That is, in the example shown in FIG. 9, the normal regulation is activated until the CPU usage rate reaches 70%, the primary regulation is activated when the CPU usage rate exceeds 70%, and the secondary regulation is activated when the CPU usage rate exceeds 80%. In addition, if the CPU usage rate does not become 70% or less, the SIP switching device 1 that once activated the secondary regulation does not cancel the secondary regulation, and the SIP switching device 1 that has once activated the primary regulation does not release the CPU usage rate. It will not be canceled unless the value falls below 60%. The reason why the activation threshold value of each regulation does not match the cancellation threshold value is to allow for a sufficient CPU operation in consideration of heat generation.

Here, the activation is to change the regulation value in FIG. 6 to a threshold value for primary regulation or to a regulation value for secondary regulation. Except for the primary regulation threshold or the secondary regulation threshold, normal regulation values are used.
The restriction values for normal use, primary restriction, and secondary restriction may be stored in the SIP request restriction condition table shown in FIG. 4, respectively, or the SIP request restriction processing unit 111a performs SIP according to the restriction state. The restriction value in the request restriction condition table may be rewritten.

(CPU usage monitoring process)
Next, the CPU usage rate monitoring process according to the second embodiment will be described along FIG. 10 with reference to FIGS.
FIG. 10 is a flowchart showing a flow of CPU monitoring processing according to the second embodiment.
First, the CPU usage rate monitoring processing unit 1113 acquires the CPU usage rate from, for example, a chip set on a motherboard (S301).
Then, the CPU usage rate monitoring processing unit 1113 refers to the regulation state determination condition table in the storage unit 15 using the CPU usage rate acquired in step S301 as a key (S302), and determines whether to change the regulation state. (S303). Specifically, it is determined whether or not the restriction state is to be changed by comparing the previous restriction state stored in the storage unit 15 after step S304 described later with the reference result in step S302.
When the restriction state is changed as a result of step S303 (S303 → Yes), the CPU usage rate monitoring processing unit 1113 changes the restriction state of the SIP request (S304), and then stores the changed restriction state in the storage unit 15. Remember. Then, the current restriction state is notified to the SIP request restriction processing unit 111a (S305). Then, the CPU usage rate monitoring processing unit 1113 proceeds to the process of step S306.
If the regulated state is not changed as a result of step S320 (S320 → No), the regulated conception monitoring processing unit waits for 1 second (S306), and then returns to the process of step S301.
The SIP request restriction processing unit 111a updates the restriction value in the SIP request restriction condition table to the restriction value according to the current restriction state, and then performs the processes of FIGS. 6 and 7 using the updated restriction value.

(Modification of the second embodiment)
In the second embodiment, the regulation value is changed according to the CPU usage rate. However, the present invention is not limited to this, and for example, the regulation value may be changed according to the resource usage rate such as the memory usage rate. . Here, the resource refers to a hardware system resource necessary for computer processing such as a storage device such as a CPU or RAM.
In the second embodiment, the number of restricted states is usually three, that is, the primary restriction and the secondary restriction. However, the number of restricted states is not limited to this, and a tertiary restriction is provided. Any number is acceptable.

(Effect of 2nd Embodiment)
According to the second embodiment, since the restriction value of the SIP request can be changed in accordance with the resource state of the SIP exchange device 1 such as the usage rate of the CPU, the SIP exchange device 1 can be operated efficiently. Can do.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
In addition, about 3rd Embodiment, about the element similar to 1st Embodiment and 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
Here, the third embodiment will be described based on the second embodiment, but may be based on the first embodiment.
FIG. 11 is a diagram illustrating a configuration example of the SIP system according to the third embodiment.
The SIP system B shown in FIG. 11 is different from the SIP system A shown in FIG. 1 in that the maintenance terminal 4 having a function of changing the restriction value of the SIP request stored in the SIP exchange device 1b is connected via the IP network 3. Are connected to the SIP exchange device 1b.
Details of the SIP exchange device 1b will be described later with reference to FIG.

FIG. 12 is a functional block diagram illustrating a configuration example of the SIP exchange device according to the third embodiment.
The SIP exchange device 1b has a configuration in which a maintenance operation unit 16 is further provided in the application layer processing unit 10 of the SIP exchange device 1 shown in FIG. The maintenance operation unit 16 receives the maintenance information transmitted from the maintenance terminal 4 via the IP network 3, and based on the maintenance information, the restriction value of the SIP request restriction condition table stored in the storage unit 15 and the restriction It has a function of updating the threshold value of the state determination condition table.

FIG. 13 is a diagram illustrating an example of the change request data format.
The change request data format is information transmitted from the maintenance terminal 4 to the SIP exchange apparatus 1b. The maintenance terminal 4 converts the change information input from the input unit of the maintenance terminal 4 (not shown) into the maintenance terminal 4 into a change request data format, and the change request data format is transmitted to the SIP exchange apparatus 1b via the IP network 3. By doing so, it is transmitted to the SIP exchange apparatus 1b.

FIG. 14 is a table showing a list of parameters in the change request data format shown in FIG. 13, and FIG. 15 is a diagram showing an example of change request setting data.
In FIG. 14, the parameter name is each parameter in the change request data format shown in FIG. 13, and the setting content is the content of the corresponding parameter. The set value is a value that is referred to when the change request data format is converted into the change request data shown in FIG. 14 in the maintenance operation unit 16 (see FIG. 12). Actually, the change request conversion table in which the parameter name and the set value in FIG. 14 correspond to each other is stored in the storage unit 15.

  The maintenance operation unit 16 of the SIP exchange apparatus 1b that has received the change request data format shown in FIG. 13 is converted into the change request setting data shown in FIG. 15 according to the change request conversion table in the storage unit 15. The maintenance operation unit 16 updates the values of the SIP request restriction condition table and the restriction state determination condition table in the storage part 15 according to the change request setting data.

Next, an example of updating the SIP request restriction condition table and the restriction state determination condition table will be described with reference to FIGS.
FIG. 16 is a diagram illustrating an update example of the SIP request restriction condition table, and FIG. 17 is a diagram illustrating an update example of the restriction state determination condition table.
In addition, although it demonstrates based on 2nd Embodiment here, it is natural that the regulation value in 1st Embodiment may be changed.
The maintenance operation unit 16 updates the restriction value at the normal time of the REGISTER request from “150” to “75” according to the change request setting data in FIG. 15, and the restriction value at the time of the primary restriction from “10” to “5”. Update to. Since the regulation value at the time of secondary regulation was originally “0”, the maintenance operation unit 16 does not update the regulation value at the time of secondary regulation. Similarly, in the INVITE request, the SUBSCRIBE request, the PUBLISH request, and the MESSAGE request, the update according to the change request setting data in FIG. 15 is performed.

  The value “500” located in the third line from the bottom of the change request setting data in FIG. 15 is the counter reset cycle time used in the counter reset process described in FIG. 7, and according to this value, the maintenance operation unit 16 The set counter reset cycle time is set to 500 milliseconds.

“75, 65” and “90, 80” located in the second and first rows from the bottom of the change request setting data in FIG. 15 are the primary regulation activation threshold and the release threshold, and the secondary regulation activation threshold, respectively. And a release threshold value.
According to these values, the maintenance operation unit 16 updates the primary regulation activation threshold from “70” to “75” and updates the release threshold from “60” to “65” as shown in FIG. To do. Also, the activation threshold for secondary regulation is updated from “80” to “90”, and the release threshold is updated from “70” to “80”.

Next, the SIP exchange device maintenance process according to the third embodiment will be described along FIG. 18 with reference to FIG.
FIG. 18 is a flowchart showing a flow of SIP exchange device maintenance processing according to the third embodiment.
First, when the maintenance person inputs setting value change information via the input unit of the maintenance terminal 4 (see FIG. 11), the maintenance terminal 4 sends the input change information to the change request as shown in FIG. After changing to the data format, the change request data format is transmitted to the SIP exchange apparatus 1b via the IP network 3. That is, the SIP exchange apparatus 1b receives the change request data format (S401). Here, the set value is a restriction value in the SIP request restriction condition table, a counter reset cycle time, an activation threshold value in the restriction state determination condition table, a release threshold value, or the like.
Upon receiving the change request data format, the maintenance operation unit 16 of the SIP exchange apparatus 1b changes the received change request data format as shown in FIG. 15 according to the change request conversion table (not shown) stored in the storage unit 15. Data is converted (S402).
Then, the maintenance operation unit 16 changes the setting value stored or set in the storage unit 15 according to the change request setting data (S403). The signal distribution unit 11a performs the processes of FIGS. 6 and 7 using a restriction value corresponding to the current restriction state.

(Modification of the third embodiment)
In the third embodiment, the maintenance terminal 4 is connected to the SIP exchange device 1b via the IP network 3. However, the present invention is not limited to this, and the maintenance terminal 4 and the SIP exchange device 1b may be directly connected. The SIP exchange device 1b may include the function of the maintenance terminal 4.

(Effect of the third embodiment)
According to the third embodiment, since each setting value including the restriction value in the SIP exchange device 1b can be updated via the maintenance terminal 4, a flexible system operation is possible.

  The application layer processing units 10 and 10b, the transaction layer processing unit 20, the transport layer processing unit 30, the signal distribution units 11 and 11a, the service processing unit 12, and the user data unit 13 in FIGS. , User authentication unit 14, maintenance operation unit 16, SIP request restriction processing unit 111, 111a, SIP signal transmission / reception processing unit 112, counter reset processing unit 1111, SIP request restriction determination processing unit 1112 and CPU usage rate monitoring processing unit 1113 An incoming call restriction program stored in a storage device such as an HD (Hard Disk) (not shown) is developed in a RAM (Random Access Memory) and executed by the CPU.

It is a figure which shows the structural example of the SIP system which concerns on 1st Embodiment. It is a functional block diagram which shows the structural example of the SIP exchange apparatus which concerns on 1st Embodiment. It is a functional block diagram which shows the structural example of the signal distribution part which concerns on 1st Embodiment. It is a figure which shows the example of the SIP request regulation condition table stored in the memory | storage part. It is a figure which shows the example of the SIP request reception counter table stored in the memory | storage part. It is a flowchart which shows the flow of the SIP request restriction | limiting determination process (incoming call restriction method) which concerns on 1st Embodiment. It is a flowchart which shows the flow of the counter reset process which concerns on 1st Embodiment. It is a functional block diagram which shows the structural example of the signal distribution part which concerns on 2nd Embodiment. It is a figure which shows the example of the regulation state determination condition table which concerns on 2nd Embodiment. It is a flowchart which shows the flow of the CPU monitoring process which concerns on 2nd Embodiment. It is a figure which shows the structural example of the SIP system which concerns on 3rd Embodiment. It is a functional block diagram which shows the structural example of the SIP exchange apparatus which concerns on 3rd Embodiment. It is a figure which shows the example of a change request data format. 14 is a table showing a list of parameters in the change request data format shown in FIG. 13. It is a figure which shows the example of change request setting data. It is a figure which shows the example of an update of a SIP request control condition table. It is a figure which shows the example of an update of a regulation state determination condition table. It is a flowchart which shows the flow of the SIP exchange apparatus maintenance process which concerns on 3rd Embodiment.

Explanation of symbols

A, B SIP system (communication system)
1,1b SIP switching device (switching device)
2 SIP user terminal (terminal)
2 'PC
2 '' IP phone 3 IP network 4 maintenance terminal 10, 10b application layer processing unit 11, 11a signal distribution unit 12 service processing unit 13 user data unit 14 user authentication unit 15 storage unit 16 maintenance operation unit 20 transaction layer processing unit 30 Transport layer processing unit 111, 111a SIP request restriction processing unit (call connection request restriction determination processing unit)
112 SIP signal transmission / reception processing unit (signal transmission / reception processing unit)
1111 Counter reset processing unit 1112 SIP request restriction determination processing unit 1113 CPU usage rate monitoring processing unit

Claims (8)

An incoming call restriction method in a switching apparatus that mediates real-time bidirectional communication between terminals via an IP network and provides services to the terminals,
The exchange device is
The storage unit holds the value of the allowable reception amount per predetermined time,
When receiving a call connection request from the terminal,
Count up the reception counter value, which is the number of call connection requests received within a predetermined time,
If the reception counter value counted up is a value larger than the allowable reception amount, do not allow service start with the terminal that has transmitted the call connection request,
When the counted up reception counter value is equal to or less than the reception allowance, the service initiation with the terminal that has transmitted the call connection request is permitted.   The incoming call restriction method according to claim 1, wherein the reception allowance can be set for each type of the call connection request. The exchange device is
In the case where the call connection request is response information, the reception allowable amount corresponding to the negative value is held correspondingly,
When the reception allowance is a negative value, permitting the service start with the terminal that has transmitted the call connection request without comparing the reception counter value with the reception allowance. The incoming call restriction method according to claim 1, wherein: The exchange device stores the predetermined time,
2. The incoming call restriction method according to claim 1, wherein the reception counter value is reset to 0 every predetermined time. The switching device can monitor the resource usage rate of the switching device itself,
2. The incoming call restriction method according to claim 1, wherein the reception allowable amount is changed in accordance with a resource usage rate of the switching apparatus itself.   The incoming call restriction according to any one of claims 1 to 5, wherein a setting value including the reception allowance can be changed via a maintenance terminal that performs maintenance of the exchange device. Method. An exchange device that mediates real-time bidirectional communication between terminals via an IP network and provides services to the terminals,
A storage unit that holds a value of the allowable reception amount per predetermined time;
A signal transmission / reception processing unit for receiving a call connection request from the terminal;
When the signal transmission / reception processing unit receives the call connection request, the signal transmission / reception processing unit counts up a reception counter value that is the number of the call connection requests received within a predetermined time. If it is a larger value, service initiation with the terminal that has transmitted the call connection request is not permitted, and if the counted up reception counter value is equal to or less than the reception allowable amount, the call connection request is transmitted. And a call connection request restriction determination processing unit that permits the start of the service with the terminal. A communication system having an exchange device that mediates real-time bidirectional communication between a terminal and a terminal via an IP network and provides a service to the terminal,
The exchange device is
The storage unit holds the value of the allowable reception amount per predetermined time,
When receiving a call connection request from the terminal,
Count up the reception counter value, which is the number of call connection requests received within a predetermined time,
If the reception counter value counted up is a value larger than the allowable reception amount, do not allow service start with the terminal that has transmitted the call connection request,
When the counted up reception counter value is equal to or less than the reception allowance, the service start with the terminal that has transmitted the call connection request is permitted.

Images