JP2010268198A - Calling side call processing device and transmission control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide congestion control that identifies a congestion range in a communication network in which a plurality of networks use the same area code. <P>SOLUTION: A calling side call processing device includes: a connection means 221 for attempting connection to a called side call processing device 121 accommodating a desired called subscriber 101 among a plurality of called side call processing devices using the same area code in response to a service request from a calling subscriber 100; a management means 222 for receiving and managing congestion identification information showing a congestion range from the plurality of called side call processing devices; and a regulating means 223 for regulating connection to the congestion range on the basis of the congestion identification information. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to congestion control in a communication network that can provide number portability or number shift.

  The landline telephone service in Japan defines telephone numbers according to a numbering system (numbering plan) called 0-ABCDE-FGHJ (hereinafter also referred to as 9D). In the above numbering system, A to J each represent a single digit. That is, a telephone number used in a domestic fixed telephone service is represented by a 10-digit numeric string starting with 0. In the above numbering system, ABCDE (hereinafter also referred to as 5D) is called a station number, and FGHJ is called a subscriber number. The area code is assigned to each telecommunications carrier by the Ministry of Internal Affairs and Communications and consists of an area code and a city code. The area code represented by the first to third digits of the area code is assigned according to the geographical location in the country. The subscriber number is assigned to the subscriber by the telecommunications carrier and identifies the subscriber.

  Public communication networks such as telephones usually do not provide facilities (resources) that can provide services to all subscribers simultaneously. Therefore, when service requests from subscribers are concentrated, congestion may occur. Thus, various congestion control methods have been proposed (see, for example, Chapter 1 (Preface) of Non-Patent Document 1). In addition, the number portability and the same number shift described later are not considered in the following description.

  Congestion is categorized into (1) regional congestion, (2) call processing device congestion, (3) subscriber congestion, and the like, depending on the cause and location of occurrence. (1) Local congestion occurs, for example, when calls for safety confirmation and visits are concentrated on call processing devices provided in disaster-affected areas such as earthquakes, floods, and typhoons. (2) Call processing device congestion occurs, for example, when calls are concentrated on a call processing device and peripheral call processing devices connected thereto when a certain call processing device fails. (3) Subscriber congestion means that, for example, when a specific subscriber accepts an application for ticket reservation, mail order, etc., the call is concentrated on the specific subscriber, thereby accommodating the specific subscriber. Occurs in the call processing device.

  A call processing device in which congestion has occurred can be identified by using the numbering system described above. (1) A call processing device in which local congestion has occurred can be identified by an area code A, AB, ABC or the like that identifies a geographical location. (2) Call processing device A call processing device in which congestion has occurred can be identified by the station number ABCDE used by the call processing device. (3) The call processing device in which subscriber congestion has occurred can be identified by the station number ABCDE included in the number 0-ABCDE-FGHJ of the subscriber in which congestion has occurred.

  Congestion control methods are classified into regulation and communication. Restriction is a method of restricting call connection to the congestion range at the entrance of the network in order to prevent the congestion from expanding. Since this method is a restriction at the entrance of the network, it is also called outgoing call regulation. On the other hand, the communication means that the bypass route is selected, the caller is urged to stop calling again when the subscriber is busy or not connected, and the congestion does not occur. This is a technique for completing a call as much as possible by connecting a restricted call while waiting for a call or waiting for a call while limiting the connection. Maximizing the call completion rate (that is, improving communication) is the primary purpose of congestion control, and outgoing restriction is positioned as a basic function for realizing this.

  Further, the main subject of congestion control is classified into a centralized type and a distributed type. In conventional communication networks, congestion control is often centralized. In the centralized congestion control, the control entity collects the congestion information to obtain an overall optimum solution, and applies specific control along the overall optimum solution. The control subject in the centralized congestion control is, for example, a congestion control device. An example of a congestion control device (traffic control device) for local congestion is described in Patent Document 1. Note that even when call processing device congestion or subscriber congestion is targeted, basically the same mechanism can be applied although information (station number, subscriber number, etc.) used for realizing congestion control is different. Hereinafter, congestion control in a conventional communication network will be described with reference to FIGS.

  FIG. 6 shows an example of a conventional communication network. The calling subscriber 400 is accommodated in the calling call processing device 420, and the terminating subscriber 401 is accommodated in the called call processing device 421. The called side call processing device 421 uses the station number ABCDE and belongs to the network 411. The calling side call processing device 420 and the called side call processing device 421 are connected via a signal line 431. Also, a congestion control server 423 is connected to the calling side call processing device 420 and the called side call processing device 421 through signal lines 430 and 433, respectively.

  FIG. 7 shows the calling side call processing device 420 of FIG. The calling side call processing device 420 includes a processor 510, a memory 511, and a switch 512. The calling side call processing device 420 is connected to the calling subscriber 400 via the subscriber line 501 and is also connected to subscribers other than the calling subscriber 400 via the subscriber line. The processor 510 refers to the storage contents (records) of the memory 511 and controls the switch 512, so that the signal line 502 and media signal (such as voice) for communicating the call processing signal with the subscriber line 501 are obtained. Data exchange is realized by exchanging with the media line 503 for communication.

  For example, a record as shown in FIG. 8 is stored in the memory 511 of FIG. That is, the call number density distribution value c / n for the station number ABCDE, the call number density distribution value d / m for the telephone number 0-ABCDE-FGHJ in which the station number and the subscriber number are combined, and the like are stored in the memory 511. Here, the call density is the number of calls that can be made per unit time [call / time].

  FIG. 9 shows the called-side call processing device 421 of FIG. The called call processing device 421 includes a processor 610, a memory 611, and a switch 612. The called call processing device 421 is connected to the terminating subscriber 401 via the subscriber line 601 and is also connected to subscribers other than the terminating subscriber 401 via the subscriber line. The processor 610 refers to the record in the memory 611 and controls the switch 612 to thereby control the subscriber line 601, the signal line 602 for communicating the call processing signal, and the media line 603 for communicating the media signal. To exchange data.

For example, a record as shown in FIG. 10 is stored in the memory 611 in FIG. That is, the memory 611 stores the presence / absence of congestion in the station number ABCDE, the presence / absence of congestion in the telephone number 0-ABCDE-FGHJ, which is a combination of the station number and the subscriber number.
FIG. 11 shows the congestion control server 423 of FIG. The congestion control server 423 includes a processor 710, a memory 711, and a signal transceiver 712. The signal transmitter / receiver 712 transmits / receives a signal to / from the calling side call processing device 420 via the signal line 430, and transmits / receives a signal to / from the called side call processing device via the signal line 433. The processor 710 generates a signal for congestion control based on the signal received by the signal transmitter / receiver 712 and the record in the memory 711, and transmits the signal via the signal transmitter / receiver 712.

  For example, information as shown in FIG. 12 is stored in the memory 711 of FIG. That is, the call number density distribution value c / n for the station number ABCDE and the list of the notification destination call processing devices to which the call number density distribution value is notified, the telephone number 0-ABCDE-FGHJ that combines the station number and the subscriber number The memory 611 stores a call number density d / m and a list of call destination call processing devices as notification destinations of the call number density.

  For example, when congestion occurs in the called-side call processing device 421, congestion control is performed in the following procedure. First, the processor 610 inside the called-side call processing device 421 detects congestion of the station number ABCDE. The processor 610 stores information indicating the presence of congestion in the record of the station number ABCDE in the memory 611. This congestion information is collected by the processor 710 inside the congestion control server 423, and congestion of the station number ABCDE is detected. The processor 710 calculates a call density distribution value that allows transmission to the station number ABCDE, creates a list of notification destination call processing devices, and stores them in the memory 711. Then, the processor 710 notifies the calling side call processing device 420 of the call density distribution value according to the above list via the signal transceiver 712. Upon receiving this notification, the processor 410 in the calling side call processing device 420 records the call density for the station number ABCDE in the memory 411. Thereafter, the processor 410 refers to the record in the memory 411 to determine whether or not the telephone number for which call connection is requested includes a station number where congestion occurs, or the telephone number where congestion occurs. It is determined whether or not there is. If the telephone number for which call connection is requested includes a station number where congestion occurs, or if the telephone number is where congestion occurs, the processor 410 is within the range of the allocated call number density. It is further determined whether or not. If it is within the range of the allocated call density, the processor 410 performs a call connection to the called call processing device 421 via the signal line 431.

Next, call density control, which is the control content of the congestion control, will be described. Details of call density control are described in Non-Patent Document 1.
Call density control is one of outgoing call restriction methods for controlling so that at most one call is made within a certain time interval T. In this example, the time width T is derived by calculating a call density distribution value based on the congestion information collected by the processor 710 inside the congestion control server 423 and notified to each calling side call processing device. The time width T may be different between the calling side call processing devices. Specifically, the processor 710 is based on congestion information (station number or telephone number where congestion occurs) collected from a number of called call processing devices including the called call processing device 421. 421 calculates the call density that can be accepted, creates a list of caller side call processing devices to which the call density is allocated, and stores it in the memory 711. Then, the processor 710 notifies a number of calling side call processing devices including the calling side call processing device 420 of the station number or telephone number where congestion occurs and the call density allocated to them.

  In addition, the list of notification destination call processing devices is created in a different manner depending on the type of congestion. For example, in the case of regional congestion, it is necessary to regulate outgoing calls to the destination call processing device provided in the congestion occurrence area. In the case of a landline telephone, it can be used that the area code (especially the area code) corresponds to the geographical location. That is, a list is created that restricts outgoing calls to station numbers corresponding to the congestion occurrence areas. If the call processing device is congested, it is necessary to regulate calls to the call processing device where the congestion has occurred and its surroundings. In this case, a list is created that restricts outgoing calls to the station numbers used by the target call processing device. If the subscriber is congested, a list is created that restricts outgoing calls to the telephone number of the subscriber in which the congestion occurs.

JP 2003-338877 A

Hirofumi Tokunaga, Hiromichi Kawano, "Traffic congestion control based on call density control", IEICE Transactions B, Vol.J 71-B, pp.322-329, 1988

  By the way, in recent years, in order to satisfy the demands of subscribers, a telecommunications carrier sometimes provides a procedure called number portability or number shift. Here, the number portability is a procedure for changing a communication provider that provides a service while continuously using a number for identifying an individual subscriber (for example, a telephone number when the service is a telephone). . The same number shift is a procedure for changing a service received from the same carrier while continuously using a number for identifying each subscriber. The same number shift is a procedure for changing a service received from the same carrier, for example, from a fixed telephone to an IP telephone.

  In order to provide number portability, it is necessary to use the same station number in a network provided by each of a plurality of different carriers. In order to provide the same number shift, it is necessary to use the same station number in a plurality of networks provided by one communication carrier. That is, there are a plurality of networks that use the same station number in a communication network that can provide number portability or transfer of the same number.

  Therefore, the call processing device in which congestion has occurred cannot be uniquely identified by the station number. Further, it is impossible to uniquely identify a call processing apparatus in which a subscriber having congestion is accommodated by a telephone number that combines a station number and a subscriber number. Therefore, it is difficult to apply the conventional centralized congestion control in a communication network that can provide number portability or number shift.

  Accordingly, an object of the present invention is to provide congestion control in which a congestion range is identified in a communication network in which a plurality of networks use the same station number.

  A calling side call processing device according to one aspect of the present invention is a called side that accommodates a desired called subscriber among a plurality of called side call processing devices that use the same station number in response to a service request from a calling subscriber. Connection means for trying to connect to the call processing device, management means for receiving and managing congestion identification information indicating the congestion range from the plurality of called call processing devices, and the congestion range based on the congestion identification information. And a regulating means for regulating the connection.

  According to the present invention, it is possible to provide congestion control in which a congestion range is identified in a communication network in which a plurality of networks use the same station number.

The figure which shows an example of the communication network containing the calling side call processing apparatus which concerns on one Embodiment. FIG. 2 is a block diagram showing the calling side call processing device of FIG. 1. The figure which shows an example of the data memorize | stored in the memory of FIG. FIG. 2 is a block diagram showing the called side call processing device of FIG. 1. The figure which shows an example of the data memorize | stored in the memory of FIG. The figure which shows an example of the conventional communication network. FIG. 7 is a block diagram showing the calling side call processing device of FIG. 6. The figure which shows an example of the data memorize | stored in the memory of FIG. FIG. 7 is a block diagram showing the called side call processing device of FIG. 6. The figure which shows an example of the data memorize | stored in the memory of FIG. The block diagram which shows the congestion control server of FIG. The figure which shows an example of the data memorize | stored in the memory of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The communication network shown in FIG. 1 includes a calling side call processing device 120 according to an embodiment of the present invention. The communication network shown in FIG. 1 is different from that shown in FIG. 6 in that there is no control entity (congestion control server 423) that performs centralized congestion control, and that the destination call processing device 121 and the call processing device 122 use the same station number ABCDE. Different from the communication network.

  In the specification of the present application, the term “call processing device” means “switch” in a telephone using a common line signal and “SIP server device” in an IP (Internet Protocol) telephone using a SIP (Session Initiation Protocol) signal. It is used as a superordinate concept that includes both. The call processing device is a device that processes connection / release signals for telephone calls or SIP sessions. Signals related to media such as audio and video are not subject to application of this embodiment. Unless necessary, the call and the session are collectively referred to as “call” without being distinguished. The function of the SIP server apparatus is called CSCF (Call / Session Control Function) in the IMS (IP Multimedia Subsystem) model, and is handled as a control function for both a call and a session. Details of the IMS model including CSCF are described in the literature "Co-authored by Gonzalo Camarillo, Miguel A. Garcia Martin," IMS Standard Text ", Rick Telecom, 2006". Further, the terms calling side and called side are merely given for convenience in describing this embodiment, and each call processing device has the same or similar function regardless of the presence or absence of these terms. It's okay. For example, the call processing device 122 may be understood as having the same or similar configuration as the called call processing device 121.

  The calling side call processing device 120 accommodates a number of subscribers including the calling subscriber 100. The calling side call processing device 120 is connected to the called side call processing device 121 and the call processing device 122 via signal lines 131 and 132, respectively. The signal lines 131 and 132 may include a relay call processing device (not shown).

  The called call processing device 121 accommodates a large number of subscribers including the terminating subscriber 101. The called-side call processing device 121 uses the station number ABCDE, and the terminating subscriber 101 is assigned the subscriber number FGHJ. That is, the telephone number 0-ABCDE-FGHJ is assigned to the terminating subscriber 101. The called-side call processing device 121 belongs to the network 111 (identifier: N).

  Call processor 122 accommodates a number of subscribers, including subscriber 102. The call processing device 122 uses the same station number ABCDE as that of the called-side call processing device 121, and a subscriber number XXXX is assigned to the subscriber 102. That is, the telephone number 0-ABCDE-XXXX is assigned to the subscriber 102. The call processing device 122 belongs to the network 112 (identifier: M).

  An example of a call connection procedure in the communication network of FIG. 1 will be described. For example, it is assumed that the accommodating network of the called subscriber 101 has moved from the network 112 to the network 111 due to number portability or shift of the same number. Upon receiving a connection request (phone number 0-ABCDE-FGHJ) from the calling subscriber 100 to the called subscriber 101, the calling side call processing device 120 uses a method for resolving a predetermined accommodating network to receive the called subscriber. The network 111 that actually accommodates 101 is specified. Then, the calling side call processing device 120 performs call connection to the network 111 or the called side call processing device 121.

  The calling side call processing device 120 may use a method for solving any existing or future accommodating network. Details of the method for resolving existing accommodation networks can be found in the document “ITU-T, Recommendation Q.769.1,“ Signaling System No. 7-ISDN User Port Enhancements for the Support of Number Portability, ”December 1999, and the document“ IETF. , RFC 3482, “Number Portability in the Global Switched Telephone Network (GSTN): An Overview,” February 2003 ”.

Here, two methods of solving the accommodation network that can be used by the calling side call processing device 120 are illustrated. Methods for solving this accommodation network are an individual database method and a centralized database method.
The individual database system is a system in which the call processing device of the network to which the target station number is originally assigned individually manages the information of the subscriber who has moved through the accommodation network. In this example, the call processing device 122 of the network 112 to which the target station number ABCDE was originally assigned manages the information of the called subscriber 101 to whom the accommodation network has moved. Upon receiving the connection request (phone number 0-ABCDE-FGHJ) from the calling subscriber 100 to the called subscriber 101, the calling side call processing device 120 establishes a call connection to the call processing device 122 having the individual database of the station number ABCDE. Try. The call processing device 122 determines that the called subscriber 101 is not accommodated by referring to the individual database, and sends the call processing to the calling side call processing device 120 together with information indicating the network 111 that currently accommodates the called subscriber 101. return. Then, the calling side call processing device 120 performs a call connection to the network 111 or the called side call processing device 121 that currently accommodates the called subscriber 101.

  The centralized database system is a system in which information on a network that actually accommodates subscribers is centrally managed by a centralized device (accommodating network solution device). In this example, when receiving the connection request (phone number 0-ABCDF-FGHJ) from the calling subscriber 100 to the called subscriber 101, the calling call processing device 120 sends the called subscriber 101 to the accommodation network resolution device. Inquire about the net that is actually accommodated. Then, the calling side call processing device 120 performs a call connection to the network 111 or the called side call processing device 121 that currently accommodates the called subscriber 101.

  As shown in FIG. 2, the calling side call processing device 120 includes a processor 210, a memory 211, and a switch 212. The processor 210 can realize various functions by, for example, executing a program stored in the memory 211 or other storage medium. For example, the processor 210 can implement a call connection control function 221, a congestion identification information management function 222, and a call restriction function 223. Of course, some or all of the call connection control function 221, the congestion identification information management function 222, and the outgoing call restriction function 223 may be realized by means other than the processor 210 (for example, a dedicated circuit).

  The calling side call processing device 120 is connected to the calling subscriber 100 via the subscriber line 201, and is also connected to subscribers other than the calling subscriber 100 via the subscriber line. The call connection control function 221 refers to the record in the memory 211 and controls the switch 212, thereby communicating the subscriber line 201 with the signal line 202 for communicating the call processing signal and the media signal (such as voice). This is a function for exchanging the media line 203 to perform data transmission / reception. The call connection control function 221 includes executing a method for solving the above-described accommodation network.

  The congestion identification information management function 222 is a function that receives and manages (for example, stores in the memory 211) congestion identification information that identifies a congestion range from the outside (for example, the called-side call processing device 121). The outgoing call restriction function 223 is a function for restricting outgoing calls to the congestion range based on the congestion identification information managed by the congestion identification information management function 222.

  As shown in FIG. 4, the incoming call processing device 121 includes a processor 310, a memory 311, and a switch 312. The processor 310 can realize various functions by, for example, executing a program stored in the memory 311 or other storage medium. For example, the processor 310 can implement a call connection control function 321, a congestion detection function 322, a congestion identification information generation function 323, and a congestion identification information notification function 324. Of course, some or all of the call connection control function 321, congestion detection function 322, congestion identification information generation function 323, and congestion identification information notification function 324 may be realized by means other than the processor 310 (for example, a dedicated circuit). .

  The called-side call processing device 121 is connected to the terminating subscriber 101 via the subscriber line 301, and is also connected to subscribers other than the terminating subscriber 101 via the subscriber line. The call connection control function 321 refers to the record in the memory 311 and controls the switch 312 to control the subscriber line 301, the signal line 302 for communicating the call processing signal, and the medium for communicating the media signal. This is a function for exchanging the line 303 to realize data transmission / reception.

The congestion detection function 322 is performed in the area where the call processing device congestion occurred in the called call processing device 121, the subscriber congestion occurred in the subscriber accommodated in the called call processing device 121, and the called call processing device 121 is provided. This is a function to detect local congestion that has occurred.
The congestion identification information generation function 323 is a function that generates congestion identification information indicating the congestion range detected by the congestion detection function 322. The congestion identification information notification function 324 is a function for notifying the congestion identification information generated by the congestion identification information generation function 323 to the outside (for example, the calling side call processing device 120).

Hereinafter, the outgoing call restriction method performed by the calling side call processing device 120 according to the present embodiment will be described.
When the called-side call processing device 121 detects some congestion by the congestion detection function 322, the congestion identification information generation function 323 generates congestion identification information indicating a congestion range. The congestion identification information includes, for example, an identifier (number) of the network 111 to which the called side call processing device 121 belongs, a combination of an area code or a station number used by the called side call processing device 121, and a telephone number of the subscriber in which subscriber congestion occurs. Any information that can identify the congestion range. The congestion identification information may be routing information other than the above numbers (IP address, URL, SIM card unique number (IMSI (International Mobile Subscriber Identity), etc.)). In particular, if the combination of the network identifier and the station number described above is used as the congestion identification information, it is possible to identify a network in which congestion actually occurs even when there are a plurality of networks using the same station number.

  The congestion identification information generated by the congestion identification information generation function 323 is stored in the memory 311. For example, as shown in FIG. 5, congestion identification information (represented by part or all of the network identifier, station number, and subscriber number in FIG. 5) is congestion control information (call density in FIG. 5). Distribution value) and a list of notification destination call processing devices.

The called-side call processing device 121 includes the congestion identification information and the congestion control information stored in the memory 311 by the congestion identification information notification function 324, and includes a list of notification destination call processing devices (for example, the calling-side call processing device 120). Notification).
The calling side call processing device 120 causes the congestion identification information management function 222 to store the congestion identification information and the congestion control information notified from the called side call processing device 121 in the memory 211 as shown in FIG. 3, for example. The calling side call processing device 120 performs congestion control using the congestion identification information stored in the memory 211.

  When a call connection is requested from the calling subscriber 100, the calling side call processing device 120 determines whether or not the call connection is subject to call restriction by the call restriction function 223. That is, the outgoing call restriction function 223 determines whether or not the connection destination of the call requested from the outgoing subscriber 100 is included in any of the congestion ranges identified by the congestion identification information stored in the memory 211. . If the call connection destination is not included in any congestion range, the calling side call processing device 120 performs call connection by the call connection control function 221. On the other hand, if the connection destination of the call is included in any of the congestion ranges, the calling side call processing device 120 performs call restriction based on the congestion control information by the call restriction function 223.

  For example, if congestion occurs in a specific called-side call processing device 121, the outgoing call restriction function 223 restricts outgoing calls to the specific called-side call processing device 121, while the specific called-side call processing device 121. Allows connection to another call processing device (for example, call processing device 122) that uses the same station number. On the other hand, if congestion occurs in the specific incoming subscriber 101, the outgoing call restriction function 223 restricts outgoing calls to the specific incoming subscriber 101, and the specific incoming call processing device 121 accommodates the specific incoming subscriber 101. Connection to a subscriber other than the terminating subscriber 101 is permitted. Alternatively, the outgoing call restriction function 223 restricts outgoing calls to the called call processing device 121 that accommodates the specific called subscriber 101, and uses another call processing device that uses the same station number as the called call processing device 121. Allow connection to.

  As described above, the calling side call processing device according to the present embodiment performs outgoing call restriction based on the congestion identification information notified from the called side call processing device. This congestion identification information is information for identifying a congestion range. Therefore, according to the calling side call processing device according to the present embodiment, it is possible to perform congestion control by identifying a congestion range even in a communication network in which a plurality of networks use the same number. Further, the calling side call processing device according to the present embodiment does not require a control subject that performs centralized congestion control, and can realize distributed congestion control. That is, the calling side call processing device according to the present embodiment can also contribute to cost reduction for congestion control.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. Further, for example, a configuration in which some components are deleted from all the components shown in the embodiment is also conceivable.

  For example, it is possible to provide a program according to the above-described embodiment by storing it in a computer-readable storage medium. Storage media that can store programs and can be read by computers, such as magnetic disks, optical disks (CD-ROM, CD-R, DVD, etc.), magneto-optical disks (MO, etc.), semiconductor memories, etc. As long as it is a medium, the storage format may be any form.

Further, the program relating to the processing of each embodiment described above may be configured to be provided by being stored on a computer connected to a network such as the Internet and downloaded via the network.
In addition, it goes without saying that the present invention can be similarly implemented even if various modifications are made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Outgoing subscriber 101 ... Incoming subscriber 102 ... Subscriber 111, 112 ... Network 120 ... Originating side call processing device 121 ... Incoming side call processing device 122 ... Call Processing devices 131, 132 ... Signal line 201 ... Subscriber line 202 ... Signal line 203 ... Media line 210 ... Processor 211 ... Memory 212 ... Switch 221 ... Call connection Control function 222 ... Congestion identification information management function 223 ... Transmission restriction function 301 ... Subscriber line 302 ... Signal line 303 ... Media line 310 ... Processor 311 ... Memory 312 ... Switch 321 ... Call connection control function 322 ... Congestion detection function 323 ... Congestion identification information generation function 324 ... Congestion identification information notification function 400 ... Originating subscriber 4 01 ... Calling subscriber 411 ... Network 420 ... Calling side call processing device 421 ... Calling side call processing device 423 ... Congestion control server 430, 431, 433 ... Signal line 501 ... Subscriber line 502 ... Signal line 503 ... Media line 510 ... Processor 511 ... Memory 512 ... Switch 601 ... Subscriber line 602 ... Signal line 603 ... Media line 610: Processor 611 ... Memory 612 ... Switch 710 ... Processor 711 ... Memory 712 ... Signal transceiver

Claims (10)

In response to a service request from a calling subscriber, connection means for attempting to connect to a called call processing device accommodating a desired called subscriber among a plurality of called call processing devices using the same station number;
Management means for receiving and managing congestion identification information indicating a congestion range from the plurality of called-side call processing devices;
A calling-side call processing device comprising: restriction means for restricting connection to the congestion range based on the congestion identification information.   When the congestion identification information indicates the occurrence of congestion in a specific called-side call processing device, the restricting means restricts connection to the specific called-side call processing device, and controls the specific called-side call processing. 2. The calling side call processing device according to claim 1, wherein connection to another called side call processing device using the same station number as the device is permitted.   The restriction means, when the congestion identification information indicates the occurrence of congestion in a specific incoming subscriber accommodated in a specific incoming call processing device, while restricting the connection to the specific incoming subscriber, 2. The calling side call processing device according to claim 1, wherein connection to another called subscriber accommodated in said specific called side call processing device is permitted.   2. The calling side call processing according to claim 1, wherein the congestion identification information includes information indicating a network to which the specific called side call processing device in which the congestion occurs and a station number used by the specific called side call processing device. apparatus.   2. The calling side call processing device according to claim 1, wherein the congestion identification information includes information indicating a station number and a subscriber number of a specific terminating subscriber in which the congestion occurs. In response to a service request from a calling subscriber, a calling call processing device that attempts to connect to a called call processing device that accommodates a desired called subscriber among a plurality of called call processing devices that use the same station number. In the outgoing regulation method to be executed,
Receiving and managing congestion identification information indicating a congestion range from the plurality of called-side call processing devices;
Restricting connection to the congestion range based on the congestion identification information.   If the congestion identification information indicates the occurrence of congestion in a specific called-side call processing device, the same station number as the specific called-side call processing device while restricting connection to the specific called-side call processing device The outgoing call control method according to claim 6, wherein connection to another called-side call processing device that uses a call is permitted.   When the congestion identification information indicates the occurrence of congestion in a specific terminating subscriber accommodated in a specific terminating call processing device, the specific terminating side is restricted while restricting connection to the specific terminating subscriber. 7. The outgoing call restriction method according to claim 6, wherein connection to another incoming subscriber accommodated in the call processing device is permitted.   7. The call origination control method according to claim 6, wherein the congestion identification information includes information indicating a network to which the specific called-side call processing device where the congestion occurs and a station number used by the specific called-side call processing device.   The call restriction method according to claim 6, wherein the congestion identification information includes information indicating a subscriber number and a station number of a specific terminating subscriber in which the congestion occurs.

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