JP5218085B2 - Gateway control device, gateway control method, and program - Google Patents

Description

  The present invention relates to a gateway control apparatus, a gateway control method, and a program for controlling a gateway apparatus that connects communication apparatuses.

  In recent years, when communication is performed between a plurality of communication devices, a gateway device (hereinafter referred to as MG: Media Gateway) that connects networks to which the communication devices belong has been used.

  The gateway device is used to connect each other's network when performing communication between the communication device connected to the network and the communication device connected to another network. Here, the network is a network such as an existing telephone exchange network or an IP (Internet Protocol) network. For example, the gateway device is used to connect an existing telephone exchange network and an IP network, an existing telephone exchange network and an existing telephone exchange network, and an IP network and an IP network.

  In addition, a gateway control device (hereinafter referred to as MGC: Media Gateway Control) that controls the MG is connected to the MG.

  Between this MGC and MG, The MGC controls the MG using a communication protocol of H.248 (see, for example, Non-Patent Document 1).

  FIG. 8 is a diagram showing an example of a form of a general communication system using MG and MGC.

  The communication system shown in FIG. 8 includes a SIP server 1000, MGC2000, MG3000, and terminals 4000 and 5000.

  The SIP server 1000 is a server that performs call control of the terminals 4000 and 5000 using SIP (Session Initiation Protocol) which is one of communication protocols.

  Terminal 4000 is a communication terminal having a communication function. The terminal 4000 may be a communication terminal connected to an existing telephone exchange network or a communication terminal connected to an IP network.

  The terminal 5000 is a communication terminal having a communication function. The terminal 5000 may be a communication terminal connected to an existing telephone exchange network, or may be a communication terminal connected to an IP network.

  The MG 3000 connects the terminal 4000 and the terminal 5000. Here, when the network connected to the terminal 4000 and the network connected to the terminal 5000 are the same type of network (for example, when both are existing telephone exchange networks or when both are IP networks), The MG 3000 performs filtering of illegal packets, bandwidth limitation, priority control, NAPT (Network Address and Port Translation) conversion, and the like. When the network connected to the terminal 4000 and the network connected to the terminal 5000 are different networks (for example, when one is an existing telephone exchange network and the other is an IP network), the MG 3000 Conversion between the interface of the existing telephone exchange network and the interface of the IP network is performed.

  MGC2000 is an H.264 standard. The MG3000 is controlled using the H.248 protocol.

  Below, the gateway control method in the form shown in FIG. 8 is demonstrated.

  FIG. 9 is a sequence diagram for explaining the gateway control method in the form shown in FIG.

  First, when a resource generation request is issued from the MGC 2000 to the MG 3000, transaction information is generated to request the generation (step S51). This transaction information is given a transaction ID (Identification) which is unique identification information. Subsequently, the transaction information is stored in the MGC 2000 (step S52).

  Then, a generation request (Add Request) for requesting generation of a resource according to the transaction information is transmitted from MGC2000 to MG3000 (step S53).

  When the generation request transmitted from MGC2000 is received by MG3000, a resource is generated by MG3000 (step S54). At this time, a Context ID that is resource identification information for identifying the resource is given to the resource. The Context ID assigned here is “1”.

  Then, Context ID = 1 is assigned to the generation response (Add Reply) to the generation request and transmitted from MG3000 to MGC2000 (step S55).

  Context ID = 1 included in the generation response transmitted from MG3000 is written (added) to the transaction information stored in step S52.

  Thereafter, when requesting a change of the resource state of Context ID = 1, transaction information is generated to request the change (step S56). This transaction information is given a transaction ID (Identification) which is unique identification information. The transaction information includes Context ID = 1 of the resource requesting the change. Subsequently, the transaction information is stored in the MGC 2000 (step S57).

  Then, a change request (Modify Request) for requesting a change of the resource state including Context ID = 1 is transmitted from MGC2000 to MG3000 (step S58). This resource state change request is a request for changing the address of a communication destination telephone, a request for temporarily closing a resource, or the like.

  When the change request transmitted from MGC2000 is received by MG3000, the resource status of Context ID = 1 included in the change request is changed (step S59).

  Then, Context ID = 1 is assigned to the change response (Modify Reply) to the change request and transmitted from MG 3000 to MGC 2000 (step S60).

  Thereafter, when requesting deletion of the resource with Context ID = 1, transaction information is generated in order to request the deletion (step S61). This transaction information is given a transaction ID (Identification) which is unique identification information. The transaction information includes Context ID = 1 of the resource requesting deletion. Subsequently, the transaction information is stored in the MGC 2000 (step S62).

  Then, a deletion request (Subtract Request) for requesting deletion of the resource including Context ID = 1 is transmitted from MGC2000 to MG3000 (step S63).

  When the deletion request transmitted from MGC2000 is received by MG3000, the resource with Context ID = 1 included in the deletion request is deleted (step S64).

  Then, Context ID = 1 is assigned to the deletion response (Subtract Reply) in response to the deletion request, and is transmitted from MG3000 to MGC2000 (step S65). Thereby, it can be recognized that the resource with Context ID = 1 has been deleted in MGC2000.

ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU H. 248.1 (09/2005)

  Here, consider the case where resumption occurs in MG3000.

  FIG. 10 is a sequence diagram for explaining a gateway control method when resumption occurs in MG 3000 in the form shown in FIG.

  First, when a resource generation request is issued from the MGC 2000 to the MG 3000, transaction information is generated to request the generation (step S71). This transaction information is given a transaction ID (Identification) which is unique identification information. Subsequently, the transaction information is stored in the MGC 2000 (step S72).

  Then, a generation request (Add Request) for requesting generation of a resource according to the transaction information is transmitted from MGC2000 to MG3000 (step S73).

  When the generation request transmitted from MGC2000 is received by MG3000, a resource is generated by MG3000 (step S74). At this time, a Context ID that is resource identification information for identifying the resource is given to the resource. The Context ID assigned here is “1”.

  Then, Context ID = 1 is assigned to the generation response (Add Reply) for the generation request and transmitted from MG3000 to MGC2000 (step S75).

  Context ID = 1 included in the generation response transmitted from MG3000 is written (added) to the transaction information stored in step S72.

  Thereafter, when resumption occurs in MG3000 (step S76), a start notification (Service Change Request) indicating that resumption has occurred is transmitted from MG3000 to MGC2000 (step S77). At the time of the restart, all the list information of the Context ID that is being managed (assigned to the resource) managed by the MG 3000 is cleared. That is, the Context ID “1” assigned to the resource generated in step S74 does not correspond to the Context ID being paid out.

  After that, when a resource generation request is issued from MGC2000 to MG3000, a generation request (Add Request) for requesting resource generation is transmitted from MGC2000 to MG3000 (step S78). Here, the transaction information generation process in step S71 and the transaction information storage process in step S72 are also performed, but the description thereof is omitted.

  When the generation request transmitted from MGC 2000 is received by MG 3000, a resource is generated (step S79). At this time, a Context ID that is resource identification information for identifying the resource is given to the resource. The Context ID assigned here is “1”.

  Here, the resource corresponding to Context ID = 1 is not the resource generated in step S74 but the resource generated in step S79 due to the restart generated in step S76.

  Thereafter, when requesting deletion of the resource generated in step S74 from the MGC 2000, the deletion request is transmitted by specifying Context ID = 1 for the resource generated in step S74 (step S80).

  When the deletion request transmitted from MGC2000 is received by MG3000, the resource corresponding to Context ID = 1 is the resource generated in step S79, so the resource generated in step S79. Is deleted (step S81).

  Then, Context ID = 1 is assigned to the generation response (Add Reply) to the generation request and transmitted from MG3000 to MGC2000 (step S82). Further, Context ID = 1 is assigned to the change response (Subtract Reply) in response to the deletion request and transmitted from MG3000 to MGC2000 (step S83).

  In this state, the resource corresponding to Context ID = 1 deleted in response to the deletion request transmitted in step S80 is the resource generated in step S79. Nevertheless, MGC2000 misrecognizes that the resource corresponding to Context ID = 1 deleted in response to the deletion request transmitted in step S80 is the resource generated in step S74.

  As described above, when resumption occurs in the MG 3000, there is a problem in that there is a discrepancy between the Context ID information of the resource recognized by the MGC 2000 and the Context ID information of the resource recognized by the MG 3000. .

  This problem also occurs when a request signal is retransmitted.

  For example, after a deletion request is transmitted, the deletion request is retransmitted when there is no response for a certain period of time. However, when MG3000 restarts between the transmission and the retransmission, the Context ID specified at the time of transmission is retransmitted. Sometimes it has been cleared.

  In order to solve such a problem, a method of clearing the Context ID information held in the MGC 2000 when the activation notification indicating resumption is received from the MG 3000 in the MGC 2000 is generally used.

  However, in order to clear the Context ID information, there is a problem that during the clear process, other processes cannot be performed, and a service stop period occurs.

  It is an object of the present invention to provide a gateway control device, a gateway control method, and a program that solve the above-described problems.

The gateway control device of the present invention
A gateway control device for controlling a gateway device for connecting a communication device,
An activation number counting unit that counts the number of times an activation notification indicating that the gateway device is activated from the gateway device;
Resource identification information given to identify the resource when the gateway device generates the change request for requesting the change of the resource state of the gateway device or the deletion request for deleting the resource. A request signal transmission unit for designating and transmitting to the gateway device;
When the request signal transmission unit transmits the change request or the deletion request, resource identification information of the change request or the resource requested to be deleted, and a count value indicated by the activation number counting unit at that time A transaction information management unit that generates transaction information including the first count value;
A storage unit for storing the transaction information;
When the response signal is not transmitted from the gateway device to the change request or the deletion request transmitted from the request signal transmission unit, the transaction information management unit generates the change request or the deletion request when transmitting the change request. A comparison unit that compares the first count value included in the transaction information with a second count value that is a count value indicated by the activation number counting unit at that time;
The request signal transmission unit resends the change request or the deletion request when the first count value and the second count value are the same as a result of the comparison in the comparison unit,
The transaction information management unit deletes the transaction information from the storage unit when the first count value and the second count value are different as a result of the comparison by the comparison unit.

The gateway control method of the present invention
A gateway control method for controlling a gateway device for connecting communication devices,
A process of counting the number of times the activation notification indicating that the gateway device has been activated is received from the gateway device;
Resource identification information given to identify the resource when the gateway device generates the change request for requesting the change of the resource state of the gateway device or the deletion request for deleting the resource. Processing to designate and transmit to the gateway device;
When transmitting the change request or the deletion request, a transaction including resource identification information of the resource requesting the change request or the deletion request and a first count value that is the count value counted at that time Processing to generate information;
When a response signal is not transmitted from the gateway device to the transmitted change request or deletion request, the first count included in the generated transaction information when transmitting the change request or the deletion request A process of comparing a value with a second count value that is the count value being counted at that time;
As a result of the comparison, when the first count value and the second count value are the same, a process of resending the change request or the deletion request;
As a result of the comparison, when the first count value and the second count value are different, processing for releasing the transaction information is included.

The program of the present invention is
A program for causing a gateway control device that controls a gateway device to connect a communication device to execute,
A procedure for counting the number of times of reception of an activation notification indicating that the gateway device has been activated from the gateway device;
Resource identification information given to identify the resource when the gateway device generates the change request for requesting the change of the resource state of the gateway device or the deletion request for deleting the resource. A procedure for designating and transmitting to the gateway device;
When transmitting the change request or the deletion request, a transaction including resource identification information of the resource requesting the change request or the deletion request and a first count value that is the count value counted at that time A procedure for generating information,
When a response signal is not transmitted from the gateway device to the transmitted change request or deletion request, the first count included in the generated transaction information when transmitting the change request or the deletion request A procedure for comparing a value with a second count value that is the count value being counted at that time;
As a result of the comparison, if the first count value and the second count value are the same, a procedure for resending the change request or the deletion request;
As a result of the comparison, when the first count value and the second count value are different, a procedure for releasing the transaction information is executed.

  As described above, in the present invention, the number of times the activation notification is received from the gateway device connected to the communication device is counted, and the resource change request or the deletion request of the gateway device is designated to the gateway device by specifying the resource identification information. When transmitting the change request or the deletion request, transaction information including the resource identification information and the first count value counted at that time is generated, and the transmitted change request or deletion request On the other hand, when the response signal is not transmitted from the gateway device, when the first count value is the same as the second count value counted at that time, the change request or the deletion request is retransmitted, When the count value of 1 is different from the second count value, the configuration is such that the transaction information is released. It is possible to prevent the occurrence of intensive services stop period after resumption of Lee device.

It is a figure which shows one Embodiment of the gateway control apparatus of this invention. It is a figure which shows an example of an internal structure of MGC shown in FIG. It is a figure which shows an example of the list of Context ID information managed by MG shown in FIG. It is a figure which shows an example of the transaction information produced | generated in the transaction information management part shown in FIG. It is a sequence diagram which shows the 1st example of the gateway control method in this form. It is a sequence diagram which shows the 2nd example of the gateway control method in this form. It is a sequence diagram which shows the 3rd example of the gateway control method in this form. It is a figure which shows an example of the form of the general communication system using MG and MGC. It is a sequence diagram for demonstrating the gateway control method in the form shown in FIG. FIG. 10 is a sequence diagram for explaining a gateway control method when resumption occurs in the MG in the form shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an embodiment of a gateway control apparatus of the present invention.

  As shown in FIG. 1, this embodiment includes a SIP server 100, an MGC 200, an MG 300, and terminals 400 and 500.

  The SIP server 100 is a server that performs call control of the terminals 400 and 500 using SIP (Session Initiation Protocol) which is one of communication protocols.

  The terminal 400 is a communication terminal having a communication function. The terminal 400 may be a communication terminal connected to an existing telephone exchange network, or may be a communication terminal connected to an IP network.

  The terminal 500 is a communication terminal having a communication function. The terminal 500 may be a communication terminal connected to an existing telephone exchange network or a communication terminal connected to an IP network.

  MG 300 connects terminal 400 and terminal 500. Here, when the network connected to the terminal 400 and the network connected to the terminal 500 are the same type of network (for example, when both are existing telephone exchange networks or when both are IP networks), The MG 300 performs filtering of illegal packets, bandwidth limitation, priority control, NAPT (Network Address and Port Translation) conversion, and the like. When the network connected to the terminal 400 and the network connected to the terminal 500 are different networks (for example, when one is an existing telephone exchange network and the other is an IP network), the MG 300 Conversion between the interface of the existing telephone exchange network and the interface of the IP network is performed.

  MGC200 is H.264. This is a gateway control device that controls the MG 300 using the H.248 protocol.

  FIG. 2 is a diagram showing an example of the internal configuration of MGC 200 shown in FIG.

  As shown in FIG. 2, the MGC 200 shown in FIG. 1 includes a SIP server communication unit 201, an MG communication unit 202, an activation count counting unit 203, a request signal transmission unit 204, a transaction information management unit 205, and a storage. A unit 206, a comparison unit 207, and a timer 208 are provided.

  The SIP server communication unit 201 communicates with the SIP server 100 shown in FIG.

  The MG communication unit 202 communicates with the MG 300 shown in FIG. In addition, the MG communication unit 202 outputs a Context ID that is resource identification information for identifying a resource given to the response signal transmitted from the MG 300 to the transaction information management unit 205. In addition, the MG communication unit 202 outputs a Service Change Request, which is a start notification transmitted when the MG 300 is restarted (started), to the start count counting unit 203. Further, the MG communication unit 202 transmits a request (generation, change, deletion) signal output from the request signal transmission unit 204 to the MG 300. Further, when a response signal to the request signal output from the request signal transmission unit 204 is transmitted from the MG 300, the MG communication unit 202 notifies the request signal transmission unit 204 to that effect.

  The activation number counting unit 203 is a counter that counts the number of times the Service Change Request has been output from the MG communication unit 202. In addition, the activation number counting unit 203 outputs a count value that is the counted number to the transaction information management unit 205.

  Based on the comparison result output from the comparison unit 207, the request signal transmission unit 204 generates a generation request (Add Request) for requesting generation of a resource, and a change request (Modify) for requesting a change in the state of the resource. Request), a request signal of a deletion request (Subtract Request) for requesting deletion of resources is generated and transmitted to the MG 300 via the MG communication unit 202. Further, when a change request or a deletion request is transmitted, a request signal is generated by assigning a Context ID stored in the storage unit 206. Further, the request signal transmission unit 204 activates the timer 208 when transmitting these request signals.

  When the request signal transmission unit 204 generates a request signal, the transaction information management unit 205 generates transaction information corresponding to the request signal and writes it to the storage unit 206. In addition, the transaction information management unit 205 adds the Context ID output from the MG communication unit 202 to the corresponding transaction information stored in the storage unit 206. Further, the count value output from the activation number counting unit 203 is added to the corresponding transaction information stored in the storage unit 206.

  The storage unit 206 stores the transaction information written by the transaction information management unit 205.

  When the comparison instruction is output from the timer 208, the comparison unit 207 includes the count value (first count value) included in the corresponding transaction information stored in the storage unit 206 and the activation number counting unit 203. The count value shown (second count value) is compared. Further, the comparison unit 207 outputs the comparison result to the request signal transmission unit 204.

  The timer 208 is a clock that measures a preset time from when it is activated by the request signal transmission unit 204. Also, a comparison instruction is output to the comparison unit 207 when a preset time has elapsed since the request signal transmission unit 204 was activated.

  FIG. 3 is a diagram showing an example of a list of Context ID information managed by the MG 300 shown in FIG.

  In the MG 300 shown in FIG. 1, as shown in FIG. 3, Context IDs of resources being paid out (in use) are listed.

  For example, as shown in FIG. 3, “0001”, “0003”, “0010”, and “0015” are listed. This indicates that Context IDs “0001”, “0003”, “0010”, and “0015” are already used.

  FIG. 4 is a diagram showing an example of transaction information generated by the transaction information management unit 205 shown in FIG.

  As shown in FIG. 4, the transaction information generated by the transaction information management unit 205 shown in FIG. 2 identifies a transaction ID, which is transaction identification information for identifying the transaction information, and an MG to which the resource is assigned. MG ID, which is MG identification information, Context ID given (paid out) from MG 300, timer information, number of connections, and the like are included.

  Here, the timer information is information indicating the time used for retransmission.

  The connection count is a count value indicated by the activation count counting unit 203 when the transaction information is generated.

  Below, the gateway control method in this form is demonstrated. Here, a time set in advance from when the request signal transmission unit 204 notifies that the request signal has been transmitted is assumed to be “T”. In addition, a case where a resource has already been generated and a change in the state of the generated resource is requested will be described as an example.

  FIG. 5 is a sequence diagram illustrating a first example of the gateway control method according to the present embodiment. In this first example, a case will be described as an example where the MG 300 does not resume until the time “T” has elapsed since the change request was transmitted.

  First, when resumption occurs in MG 300 (step S1), a start notification (Service Change Request) indicating that resumption has occurred is transmitted from MG 300 to MGC 200 (step S2).

  Then, the count value indicated by the activation number counting unit 203 is incremented by one (step S3).

  Thereafter, when requesting a change of the resource state, transaction information is generated by the transaction information management unit 205 in order to request the change (step S4). This transaction information is given a transaction ID (Identification) which is unique identification information. At this time, the count value indicated by the activation count unit 203 is included in the transaction information. Further, the Context ID of the resource requesting the change is included in the transaction information. Subsequently, the transaction information is stored in the storage unit 206 by the transaction information management unit 205 (step S5).

  Then, a change request (Modify Request) for requesting a change of the resource state including the Context ID that is the resource identification information of the resource to be changed is transmitted from the request signal transmission unit 204 to the MG 300 via the MG communication unit 202. (Step S6).

  At the time of this transmission, the timer 208 is started by the request signal transmission unit 204.

  Here, the time “T (timed by the timer 208)” has passed without a response signal to the change request transmitted from the request signal transmission unit 204 to the MG 300 via the MG communication unit 202 being transmitted for some reason. In this case, the count value indicated by the activation number counting unit 203 is compared with the count value included in the transaction information by the comparison unit 207 (step S7).

  As a result of the comparison, here, since the count value indicated by the activation number counting unit 203 is the same as the count value included in the transaction information, the change request is sent from the request signal transmission unit 204 to the MG communication unit 202. Via MG 300 (step S8).

  FIG. 6 is a sequence diagram illustrating a second example of the gateway control method according to the present embodiment. In the second example, a case will be described as an example where the MG 300 is restarted after the change request is transmitted and before the time “T” elapses.

  First, when resumption occurs in the MG 300 (step S11), a startup notification (Service Change Request) indicating that resumption has occurred is transmitted from the MG 300 to the MGC 200 (step S12).

  Then, the count value indicated by the activation number counting unit 203 is incremented by one (step S13).

  Thereafter, when requesting a change of the resource state, transaction information is generated by the transaction information management unit 205 in order to request the change (step S14). This transaction information is given a transaction ID (Identification) which is unique identification information. At this time, the count value indicated by the activation count unit 203 is included in the transaction information. Further, the Context ID of the resource requesting the change is included in the transaction information. Subsequently, the transaction information is stored in the storage unit 206 by the transaction information management unit 205 (step S15).

  Then, a change request (Modify Request) for requesting a change of the resource state including the Context ID that is the resource identification information of the resource to be changed is transmitted from the request signal transmission unit 204 to the MG 300 via the MG communication unit 202. (Step S16).

  At the time of this transmission, the timer 208 is started by the request signal transmission unit 204.

  Here, if resumption occurs in the MG 300 between the time when the timer 208 is activated and the time “T (time is counted by the timer 208)” (step S17), the activation notification indicating that the resumption has occurred. (Service Change Request) is transmitted from the MG 300 to the MGC 200 (step S18).

  Then, the count value indicated by the activation number counting unit 203 is incremented by one (step S19).

  Here, the time “T (timed by the timer 208)” has passed without a response signal to the change request transmitted from the request signal transmission unit 204 to the MG 300 via the MG communication unit 202 being transmitted for some reason. In this case, the count value indicated by the activation number counting unit 203 is compared with the count value included in the transaction information by the comparison unit 207 (step S20).

  As a result of the comparison, here, since the count value indicated by the activation number counting unit 203 is different from the count value included in the transaction information, the transaction information is deleted (released) from the storage unit 206 (step S21). ). That is, the Context ID included in the transaction information is not managed (recognized as being used) by the MGC 200.

  FIG. 7 is a sequence diagram showing a third example of the gateway control method according to the present embodiment. In this third example, the MG 300 does not restart until the first time “T” has elapsed since the change request was transmitted, and then the time “T” elapses after the change request is retransmitted. In the meantime, the case where the MG 300 is restarted will be described as an example.

  First, when resumption occurs in MG 300 (step S31), a start notification (Service Change Request) indicating that resumption has occurred is transmitted from MG 300 to MGC 200 (step S32).

  Then, the count value indicated by the activation number counting unit 203 is incremented by one (step S33).

  Thereafter, when requesting a change of the resource state, transaction information is generated by the transaction information management unit 205 in order to request the change (step S34). This transaction information is given a transaction ID (Identification) which is unique identification information. At this time, the count value indicated by the activation count unit 203 is included in the transaction information. Further, the Context ID of the resource requesting the change is included in the transaction information. Subsequently, the transaction information is stored in the storage unit 206 by the transaction information management unit 205 (step S35).

  Then, a change request (Modify Request) for requesting a change of the resource state including the Context ID that is the resource identification information of the resource to be changed is transmitted from the request signal transmission unit 204 to the MG 300 via the MG communication unit 202. (Step S36).

  At the time of this transmission, the timer 208 is started by the request signal transmission unit 204.

  Here, the time “T (timed by the timer 208)” has passed without a response signal to the change request transmitted from the request signal transmission unit 204 to the MG 300 via the MG communication unit 202 being transmitted for some reason. In this case, the count value indicated by the activation number counting unit 203 is compared with the count value included in the transaction information by the comparison unit 207 (step S37).

  As a result of the comparison, here, since the count value indicated by the activation number counting unit 203 is the same as the count value included in the transaction information, the change request is sent from the request signal transmission unit 204 to the MG communication unit 202. Via MG 300 (step S38).

  At the time of this transmission, the request signal transmission unit 204 starts the timer 208 again from “0”.

  Here, if resumption occurs in the MG 300 between the time when the timer 208 is activated and the time “T (time is counted by the timer 208)” (step S39), the activation notification indicating that the resumption has occurred. (Service Change Request) is transmitted from MG 300 to MGC 200 (step S40).

  Then, the count value indicated by the activation number counting unit 203 is incremented by one (step S41).

  Here, the time “T (timed by the timer 208)” has passed without a response signal to the change request transmitted from the request signal transmission unit 204 to the MG 300 via the MG communication unit 202 being transmitted for some reason. In this case, the count value indicated by the activation number counting unit 203 is compared with the count value included in the transaction information by the comparison unit 207 (step S42).

  As a result of the comparison, here, since the count value indicated by the activation count unit 203 is different from the count value included in the transaction information, the transaction information is deleted (released) from the storage unit 206 (step S43). ). That is, the Context ID included in the transaction information is not managed (recognized as being used) by the MGC 200.

  In addition to the resource change request described above, the same processing is performed for resending a resource generation request and a resource deletion request.

  As described above, in order to delete only the resource information of the resource related to the request signal retransmitted after the MG 300 is restarted, among the resource information managed (recognized) in the MGC 200, Occurrence of an intensive service outage period can be prevented.

  Note that the above-described processing of the MGC 200 may be performed by a logic circuit manufactured according to the purpose. Alternatively, the program describing the processing contents may be recorded on a recording medium readable by the MGC 200, and the program recorded on the recording medium may be read by the MGC 200 and executed. The recording medium readable by the MGC 200 includes a removable recording medium such as a floppy disk (registered trademark), a magneto-optical disk, a DVD, and a CD, a memory such as a ROM and a RAM built in the MGC 200, an HDD, and the like. Point to. The program recorded on this recording medium is read by the CPU in the MGC 200, and the same processing as described above is performed under the control of the CPU. Here, the CPU operates as a computer that executes a program read from a recording medium on which the program is recorded.

100 SIP server 200 MGC
201 SIP server communication unit 202 MG communication unit 203 Activation count counting unit 204 Request signal transmission unit 205 Transaction information management unit 206 Storage unit 207 Comparison unit 208 Timer 300 MG
400,500 terminals

Claims (13)

A gateway control device for controlling a gateway device for connecting a communication device,
An activation number counting unit that counts the number of times an activation notification indicating that the gateway device is activated from the gateway device;
Resource identification information given to identify the resource when the gateway device generates the change request for requesting the change of the resource state of the gateway device or the deletion request for deleting the resource. A request signal transmission unit for designating and transmitting to the gateway device;
When the request signal transmission unit transmits the change request or the deletion request, resource identification information of the change request or the resource requested to be deleted, and a count value indicated by the activation number counting unit at that time A transaction information management unit that generates transaction information including the first count value;
A storage unit for storing the transaction information;
When the response signal is not transmitted from the gateway device to the change request or the deletion request transmitted from the request signal transmission unit, the transaction information management unit generates the change request or the deletion request when transmitting the change request. A comparison unit that compares the first count value included in the transaction information with a second count value that is a count value indicated by the activation number counting unit at that time;
The request signal transmission unit resends the change request or the deletion request when the first count value and the second count value are the same as a result of the comparison in the comparison unit,
The transaction information management unit is a gateway control device that deletes the transaction information from the storage unit when the first count value and the second count value are different as a result of the comparison by the comparison unit. The gateway control device according to claim 1,
The comparison unit performs the comparison when the response signal is not transmitted from the gateway device until a predetermined time elapses after the request signal transmission unit transmits the change request or the deletion request. A gateway control device. The gateway control device according to claim 1,
The request signal transmission unit transmits a generation request for requesting generation of the resource to the gateway device, to the gateway device,
When the request signal transmission unit transmits the generation request, the transaction information management unit generates transaction information including a first count value that is a count value indicated by the activation count counting unit at that time And
The comparison unit generates transaction information generated by the transaction information management unit when transmitting the generation request when a response signal is not transmitted from the gateway device in response to the generation request transmitted from the request signal transmission unit. The first count value included in the second count value, which is the count value indicated by the activation number counting unit at that time,
The request signal transmission unit retransmits the generation request when the first count value and the second count value are the same as a result of comparison in the comparison unit. The gateway control device according to claim 1,
The gateway control device, wherein the activation count counting unit increments the count value by one when receiving the activation notification. In the gateway control device according to any one of claims 1 to 4,
Signal transmission / reception between the gateway control device and the gateway device is performed in H.264. 248. The gateway control apparatus according to the H.248 protocol. A gateway control method for controlling a gateway device for connecting communication devices,
A process of counting the number of times the activation notification indicating that the gateway device has been activated is received from the gateway device;
Resource identification information given to identify the resource when the gateway device generates the change request for requesting the change of the resource state of the gateway device or the deletion request for deleting the resource. Processing to designate and transmit to the gateway device;
When transmitting the change request or the deletion request, a transaction including resource identification information of the resource requesting the change request or the deletion request and a first count value that is the count value counted at that time Processing to generate information;
When a response signal is not transmitted from the gateway device to the transmitted change request or deletion request, the first count included in the generated transaction information when transmitting the change request or the deletion request A process of comparing a value with a second count value that is the count value being counted at that time;
As a result of the comparison, when the first count value and the second count value are the same, a process of resending the change request or the deletion request;
A gateway control method comprising: processing for releasing the transaction information when the first count value and the second count value are different as a result of the comparison. The gateway control method according to claim 6, wherein
A gateway control method comprising a process of performing the comparison when the response signal is not transmitted from the gateway device until a predetermined time elapses after the change request or the deletion request is transmitted. . The gateway control method according to claim 6, wherein
Processing for transmitting a generation request for requesting generation of the resource to the gateway device;
When transmitting the generation request, a process of generating transaction information including a first count value that is the count value counted at that time;
When a response signal is not transmitted from the gateway device in response to the generated generation request, a first count value included in the generated transaction information when transmitting the generation request, and the count at that time A process of comparing the second count value, which is the count value being
As a result of the comparison, when the first count value and the second count value are the same, the gateway control method includes a process of resending the generation request. The gateway control method according to claim 6, wherein
A gateway control method comprising a process of incrementing the count value by one when the activation notification is received. In the gateway control device that controls the gateway device that connects the communication device,
A procedure for counting the number of times of reception of an activation notification indicating that the gateway device has been activated from the gateway device;
Resource identification information given to identify the resource when the gateway device generates the change request for requesting the change of the resource state of the gateway device or the deletion request for deleting the resource. A procedure for designating and transmitting to the gateway device;
When transmitting the change request or the deletion request, a transaction including resource identification information of the resource requesting the change request or the deletion request and a first count value that is the count value counted at that time A procedure for generating information,
When a response signal is not transmitted from the gateway device to the transmitted change request or deletion request, the first count included in the generated transaction information when transmitting the change request or the deletion request A procedure for comparing a value with a second count value that is the count value being counted at that time;
As a result of the comparison, if the first count value and the second count value are the same, a procedure for resending the change request or the deletion request;
A program for executing a procedure of releasing the transaction information when the first count value and the second count value are different as a result of the comparison. The program according to claim 10, wherein
A program for executing a procedure for performing the comparison when the response signal is not transmitted from the gateway device until a predetermined time elapses after the change request or the deletion request is transmitted. The program according to claim 10, wherein
A procedure for transmitting to the gateway device a generation request for requesting the gateway device to generate the resource;
A procedure for generating transaction information including a first count value, which is the count value being counted at that time, when transmitting the generation request;
When a response signal is not transmitted from the gateway device in response to the generated generation request, a first count value included in the generated transaction information when transmitting the generation request, and the count at that time Comparing the second count value, which is the count value being
A program for executing a procedure for retransmitting the generation request when the first count value and the second count value are the same as a result of the comparison. The program according to claim 10, wherein
A program for executing a procedure for counting up the count value by one when the activation notification is received.

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