JP2016111598A - Communication relay device and communication relay device relay method - Google Patents

Abstract

PURPOSE: To provide a communication relay device and a communication relay device relay method that can keep a normal communication state even if a change command urging the change of editing contents is issued during communication corresponding to a call signal.CONSTITUTION: When a call signal between communication devices is relayed and edited via a network with which a plurality of communication devices are connected, only if the number of calls referring to edited contents data representing the contents of the editing is zero, the edited contents data is updated according to a change command urging the change of the edited contents.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication relay device that relays communication between a plurality of communication devices connected to a network, and a relay method of the communication relay device.

  Currently, an IP (Internet Protocol) telephone system that establishes telephone communication by using SIP (Session Initiation Protocol) as a call control protocol has become widespread. In the IP telephone system, an SBC (Session Border Controller) is provided as a gateway installed at the boundary between different networks. This SIP relay device as an SBC has an editing function for editing a SIP signal as a call signal when relaying communication between networks (see, for example, Patent Document 1).

  In addition, a method for updating a telephone number translation database has been proposed as a technique that enables editing of various types of information used in communication processing during operation of a communication system (see, for example, Patent Document 2). In such a number translation database update method, in addition to the current number translation database, a backup number translation database is provided. When a number translation database update request is made, first, only the backup number translation database is provided. Update according to the request. When the test terminal confirms the normality in the backup number translation database, the backup number translation database is reflected in the current number translation database.

JP2013-012856A JP 09-18904 A

  However, by adopting the above-described technique, for example, during operation of the IP telephone system, a change command for changing the editing content for the SIP signal is supplied to the SIP relay device, and data indicating the editing content (referred to as editing content data). ) May cause the following problems.

  For example, it is assumed that the edited content data before change represents non-deletion of the time stamp added to the INVITE request defined in the protocol specification (RFC3261). Here, when the INVITE request issued from the originating SIP server is received, the SIP relay device sends the INVITE request with the time stamp added to the received INVITE request as it is based on the edited content data. To the SIP server. Therefore, immediately after that, when receiving the change instruction for deleting the edit content data added to the INVITE request and updating the content to be given a new time stamp in the transmission response, the SIP relay device The editing content data is updated with the new editing content. Therefore, when a response message with a time stamp is subsequently transmitted from the SIP server of the transmission destination, the SIP relay device adds a new time stamp to the received response message based on the updated edited content data. The response message is sent to the originating SIP server.

  As a result, the originating SIP server receives a response message to which the time stamp issued by the SIP relay apparatus is added in addition to the time stamp issued by itself, and the two time stamps are used to In some cases, communication processing was hindered.

  Therefore, in the present invention, a communication relay device and a relay method for the communication relay device capable of maintaining normal communication even when a change command for instructing a change in edit contents for a call signal is issued during operation of the communication system The purpose is to provide.

  The communication relay device according to the present invention is a communication relay device that relays a call signal between communication devices via a network to which a plurality of communication devices are connected, and represents an editing content that is applied to the call signal. A memory in which content data is stored, an edit transmission unit that transmits the edited call signal to the communication device as a destination, with reference to the edited content data in response to reception of the call signal; A call management unit that stores call management data based on the call signal in response to reception of the call signal, and deletes the call management data from the memory in response to reception of a communication disconnection signal; and the call management data Is determined according to the change instruction only when the determination unit determines that the call management data is not stored in the memory. With a, and an update unit that performs the update of the current contents of the data.

  A relay method for a communication relay device according to the present invention is a relay method for a communication relay device that relays a call signal between communication devices via a network to which a plurality of communication devices are connected. In response to reception of the call signal, the edit content data is read from a memory storing edit content data representing the edit content to be applied to the call signal, and the call signal is edited with reference to the edit content data. Transmitting the call management data based on the call signal in the memory in response to reception of the call signal, and storing the call management data in response to reception of a communication disconnection signal. Deleting from the memory; determining whether the call management data is stored in the memory; and determining that the call management data is not stored Only, having the steps of updating the edited contents data according to the change command.

  In the present invention, when relaying and editing a call signal between communication devices via a network to which a plurality of communication devices are connected, the number of “calls” referring to edit content data representing the content of the edit Only when the value is zero, a change command for changing the editing content is accepted and the editing content data is updated. As a result, the edited content data is not updated during communication according to the call signal, so that normal communication can be maintained.

It is a block diagram which shows the structure of the communication system containing the SIP relay apparatus 100 as a communication relay apparatus based on this invention. 3 is a diagram illustrating an example of data stored in a management memory 11. FIG. 4 is a flowchart showing a SIP editing / transmission control routine executed by a SIP processing unit 10. It is a figure which shows the flow of the communication implemented via the SIP relay apparatus 100, when SIP server SSa makes a call with respect to SIP server SSb. 4 is a flowchart showing a SIP editing content data change routine executed by a SIP editing content control unit 20.

  FIG. 1 is a block diagram showing a configuration of a communication system including a SIP relay device 100 as a communication relay device according to the present invention. As shown in FIG. 1, the communication system includes a SIP relay device 100, different networks NWa and NWb, and SIP servers SSa and SSb connected to the network networks NWa and NWb, respectively. Note that a plurality of SIP servers SSa are actually connected to the network NWa, and a plurality of SIP servers SSb are connected to the network NWb.

  The SIP relay device 100 includes a SIP processing unit 10, a management memory 11, and a surface reference counter 12. The SIP relay device 100 is, for example, an SBC.

  The SIP processing unit 10 is connected to networks NWa and NWb as IP networks. The SIP processing unit 10 edits and relays a SIP signal as a call signal transmitted between SIP servers SSa and SSb as communication devices via different networks NWa and NWb. The SIP processing unit 10 also includes a SIP editing content control unit 20 that updates SIP signal editing content data. The operation of the SIP editing content control unit 20 will be described later.

  The management memory 11 is provided with two areas as shown in FIG. 2A in order to store SIP editing contents data representing editing contents (deletion, addition, change, etc.) applied to the received SIP signal. Yes. Hereinafter, one of these two areas is referred to as “0 plane” and the other area as “1 plane”. At this time, the SIP editing content data QC0 is stored on the 0th surface of the management memory 11, and the SIP editing content data QC1 is stored on the 1st surface.

  The management memory 11 stores operation side management data RD indicating which of the 0 side and the 1 side is the operation side (operation area) at the present time. That is, during normal operation, the SIP processing unit 10 edits the received SIP signal in accordance with the SIP editing content data stored in the one set to the operation side of the 0th and 1st sides. At this time, the one that is not set as the operation side of the 0 side and the 1 side is set as the holding side (holding area). The SIP editing content data stored on the conservative side is used to check whether or not communication is normally performed when the SIP signal is edited with new updated SIP editing content data.

  Furthermore, in the management memory 11, for each “call” in telephone communication, as shown in FIG. 2C, for example, as shown in FIG. Call management data CD for managing calls is stored. Further, as shown in FIG. 2C, SIP editing content reference plane data SAD is stored in association with the call management data CD corresponding to each “call”.

  The SIP editing content reference plane data SAD is stored in either of the 0 plane and the 1 plane when the “call” is established, that is, when the SIP relay apparatus 100 receives the initial-INVITE. Indicates whether the SIP signal has been edited with reference to the content data (QC0, QC1). As a result, the SIP relay device 100 determines which of the SIP editing content data QC0 and QC1 that is managed in two planes for each “call” is used to edit the SIP signal. The association between the SIP signal and each “call” is based on RFC 3261, which is a protocol specification established by, for example, IETF (Internet Engineering Task Force). That is, using the Call-ID and From tag, the SIP signal that matches the Call-ID and From tag of the initial-INVITE is regarded as a SIP signal belonging to the same call as the initial-INVITE.

  The surface reference counter 12 counts the number of “calls” for which the SIP signal has been edited with reference to the SIP editing content data stored in the surface for each of the 0 and 1 surfaces.

  That is, the plane reference counter 12 shows the count value of “calls” referring to the SIP editing content data QC0 stored in the above-described plane 0 in order to edit the SIP signal, that is, the reference call count in FIG. This is supplied to the SIP processing unit 10 as the 0-plane reference call count T0 shown. Further, the plane reference counter 12 sets the reference call count, which is a count value of “calls” referring to the SIP editing content data QC1 stored in the above-described one plane to edit the SIP signal, as shown in FIG. Is supplied to the SIP processing unit 10 as the one-side reference call count T1 shown in FIG.

  For example, the plane reference counter 12 receives the SIP signal indicating initial-INVITE, that is, when the SIP signal is edited with reference to the SIP editing content data QC0 when the SIP indicating "call" is generated. Increments the 0-side reference call count T0 by one. If the SIP editing content data (QC0, QC1) is not referenced, the number of reference calls (T0, T1) is zero. That is, the reference call number (T0, T1) is 1 or more when there is a “call” referring to the SIP editing content data (QC0, QC1), and is zero when there is no call. Thereby, the SIP processing unit 10 is based on the 0-plane reference call count T0 and the 1-plane reference call count T1 supplied from the plane reference counter 12, and before changing the SIP editing content data (QC0 or QC1) for each plane. It is possible to determine whether or not there is a “call” referring to the SIP editing content data stored in the “plane”.

  When the SIP processing unit 10 receives a SIP signal representing an initial-INVITE transmitted from the SIP server SSa or SSb, that is, a call signal for calling a destination, the initial obtained by performing editing processing on the received SIP signal -SIP signal representing INVITE is transmitted to the destination.

  FIG. 3 is a flowchart showing a SIP editing / transmission control routine executed by the SIP processing unit 10. In FIG. 3, first, the SIP processing unit 10 determines whether or not a SIP signal has been received (step S21). If it is determined that the SIP signal has not been received, the SIP processing unit 10 waits for a certain period of time (step S22), and returns to step S21 described above after waiting for the certain period of time. When it is determined that the SIP signal has been received, the SIP processing unit 10 determines whether or not the received SIP signal represents initial-INVITE (step S23). That is, the SIP processing unit 10 determines whether a call signal is received.

  When the received SIP signal represents initial-INVITE, that is, when a call signal is received, the SIP processing unit 10 reads the operational management data RD from the management memory 11 and acquires it (step S24). Next, the SIP processing unit 10 performs SIP editing contents from the side set as the operation side in the operation side management data RD among the 0 side and the 1 side shown in FIG. Data (QC0 or QC1) is read and acquired (step S25). Next, the SIP processing unit 10 generates call management data CD (indicating a dialog ID, a calling number, a called number, etc.) indicating “call” information relating to the received SIP signal, and this is shown in FIG. As shown, it is added to the management memory 11 (step S26). Next, the SIP processing unit 10 uses the above-described operational plane management data RD among the 0 plane reference call count T0 and the 1 plane reference call count T1 in the plane reference counter 12 shown in FIG. The value corresponding to the plane (0 plane or 1 plane) set as the operational plane is incremented by 1 (step S27). Next, the SIP processing unit 10 edits the received SIP signal according to the SIP editing content data (QC0 or QC1) read from the side set as the operation side acquired in step S25. The SIP signal obtained by the transmission is transmitted to the destination SIP server (step S28). After executing step S28, the SIP processing unit 10 returns to step S21 described above.

  On the other hand, if it is determined in step S23 that the received SIP signal does not represent initial-INVITE, that is, it is not a call signal, the SIP processing unit 10 performs call management corresponding to the dialog ID of the received SIP signal. The data CD and the SIP editing content reference plane data SAD are read from the management memory 11 and acquired (step S29). Next, the SIP processing unit 10 reads out the SIP editing content data (QC0 or QC1) stored in the surface (0 surface or 1 surface) indicated by the SIP editing content reference surface data SAD from the management memory 11. Is acquired (step S30). Next, the SIP processing unit 10 determines whether or not the received SIP signal represents a response to the SIP signal indicating BYE, that is, a response to the communication disconnection signal prompting communication disconnection (step S31).

  If it is determined in step S31 that the received SIP signal does not represent a response to BYE, the SIP processing unit 10 returns to step S28 described above. That is, the SIP signal obtained by editing the received SIP signal according to the SIP editing content data (QC0 or QC1) acquired in step S25 is transmitted to the SIP server of the transmission destination.

  On the other hand, if it is determined in step S31 that the received SIP signal is a response to BYE, the “call” is released, and therefore the SIP processing unit 10 associates with each “call” in FIG. As shown in c), the call management data corresponding to the same dialog ID as the received SIP signal is deleted from the call management data CD stored in the management memory 11 (step S32). At this time, it is not necessary for the “call” to refer to the SIP editing content data any more. Therefore, next, the SIP processing unit 10 selects the SIP acquired in step S29 from among the current 0 plane reference call count T0 and 1 plane reference call count T1 in the plane reference counter 12 shown in FIG. The number of reference calls corresponding to the plane (0 plane or 1 plane) indicated by the edited content reference plane data SAD is decremented by 1 (step S33).

  After executing step S33, the SIP processing unit 10 executes step S28 described above. That is, the SIP signal obtained by editing the received SIP signal according to the SIP editing content data (QC0 or QC1) acquired in step S25 is transmitted to the SIP server of the transmission destination.

  FIG. 4 shows a flow of communication performed via the SIP relay device 100 when the SIP server SSa transmits a SIP signal representing initial-INVITE, that is, a call signal, in order to establish communication with the SIP server SSb. FIG.

  In FIG. 4, when the SIP relay device 100 receives the SIP signal representing the initial-INVITE transmitted from the SIP server SSa, the SIP processing unit 10 of the SIP relay device 100 executes the SIP editing / transmission control shown in FIG. . As a result, the SIP relay device 100 sends the SIP signal representing the initial-INVITE obtained by editing the received SIP signal according to the SIP editing content data (QC0 or QC1) to the destination SIP server SSb. Send to. When the SIP server SSb receives a SIP signal representing initial-INVITE, the SIP server SSb transmits a SIP signal representing a response message to the SIP relay device 100. When the SIP relay device 100 receives the SIP signal representing the response message, the SIP relay device 100 edits the SIP signal representing the response message, which is obtained by editing the received SIP signal according to the SIP editing content data (QC0 or QC1). It transmits to the source SIP server SSa.

  When the SIP editing content control unit 20 receives a change command for changing the editing content of the SIP signal during operation of the communication system, for example, during the communication operation shown in FIG. 4, the SIP editing content data stored in the management memory 11 is received. (QC0, QC1) is updated by the configuration file CF representing the new SIP editing content data after the change.

  FIG. 5 is a flowchart showing a SIP editing content data change routine executed by the SIP editing content control unit 20. In FIG. 5, first, the SIP edit content control unit 20 determines whether or not a change command requesting change of SIP edit content data has been received (step S41).

  If it is determined in step S41 that no change command has been received, the SIP editing content control unit 20 waits for a predetermined time (step S42), and then returns to step S41 described above.

  On the other hand, if it is determined in step S41 that a change command has been received, the SIP editing content control unit 20 reads the operational management data RD from the management memory 11 and acquires it (step S43). Next, the SIP editing content control unit 20 sets the operation plane in the operation plane management data RD among the 0 plane reference call count T0 and the 1 plane reference call count T1 supplied from the plane reference counter 12. The number of reference calls (T0 or T1) of the one different from (0 or 1), that is, the one corresponding to the reserved surface is acquired (step S44).

  Next, the SIP editing content control unit 20 determines whether or not the number of reference calls (T0 or T1) corresponding to the reserved surface is zero (step S45). Here, the reference call number (T0 or T1) being zero means that the call management data CD shown in FIG. Therefore, in step S45, it is determined whether or not the call management data CD is stored in the management memory 11.

  If it is determined in step S45 that the number of reference calls (T0 or T1) corresponding to the conservative surface is not zero, there is a possibility that the SIP editing content data (QC0 or QC1) corresponding to the conservative surface will be referred to. is there. Therefore, at this time, the SIP editing content control unit 20 transmits an error message indicating that the updating of the SIP editing content data has not been performed to the source of the change command (step S46).

  On the other hand, if it is determined in step S45 that the number of reference calls (T0 or T1) corresponding to the conservative surface is zero, that is, if it is determined that the call management data CD is not stored in the management memory 11, The SIP editing content control unit 20 executes the following step S47. That is, the SIP editing content control unit 20 stores the new SIP editing content data represented by the externally supplied configuration file CF in the copy of the 0th and 1st pages of the management memory 11 shown in FIG. Overwriting the face set as the face (step S47).

  Thus, only when it is determined in step S45 that the call management data CD is not stored in the management memory 11, the SIP editing content data is updated by executing step S47.

  Next, the SIP editing content control unit 20 changes the operation surface indicated by the operation surface management data RD so as to be the surface set as the conservative surface in step S47 (step S48). That is, in the stage immediately before step S48, for example, when the 0 side of the management memory 11 shown in FIG. 2A is set as the operation side and the 1 side as the conservative side, by executing this step S48, The operation side indicated by the operation side management data RD is changed from 0 side to 1 side.

  After executing step S46 or S48 described above, the SIP editing content control unit 20 returns to step S41 and executes the above-described operation again.

  As described above, the SIP editing content control unit 20 is zero when the number of “calls” (reference number of calls) referring to the side corresponding to the conservative side of the SIP editing content data QC0 and QC1 is zero. Only when it is determined that the call management data CD shown in FIG. 2C does not exist in the management memory 11, the SIP editing content data is updated in response to the change command.

  Therefore, according to such a configuration, even if a change command is received during communication according to the call signal as shown in FIG. 4, the SIP editing content data is not changed. For example, even when a change command is received at the timing t1 shown by the broken line in FIG. 4, the SIP editing content data (QC0 or QC1) referred to when editing the SIP signal representing the initial-INVITE is This is also referred to when editing the SIP signal representing the response. Further, the SIP editing content data is held without being deleted until all the “calls” generated before receiving the change command are disconnected.

  Therefore, according to the SIP relay device 100, it is possible to maintain normal communication processing even when a command to change the editing content for the SIP signal is issued during communication according to the call signal.

  In the above-described embodiment, the operation of the SIP relay device 100 is described as SBC. However, as the SIP relay device 100, a SIP server having the functions responsible for the control shown in FIGS. 2, 3, and 5 is employed. May be.

  In step S46, if it is determined that the number of reference calls corresponding to the conservative surface is not zero, an error message indicating that the SIP editing content data has not been updated is transmitted. However, the editing content data update process may be executed in the following procedure without sending an error message.

  That is, when it is determined that the number of reference calls corresponding to the conservative surface is not zero, that is, when it is determined that the call management data CD is stored in the management memory 11, the table is displayed in the configuration file CF supplied externally. The new SIP editing content data is temporarily stored in the SIP relay device 100. Thereafter, if it is determined that the call management data CD is not stored in the management memory 11, the SIP editing content data temporarily stored as described above is overwritten on the management memory 11 to thereby store the SIP editing content data. Update.

  In short, the communication relay device (100) according to the present invention includes the following memory (11), edit transmission unit (10, S28), call management unit (10, S26, S32), determination unit (20, S45), And what is necessary is just to have an update part (20, S47). The memory (11) stores edited content data (QC0, QC1) representing the content of editing applied to the call signal (initial-INVITE). In response to the reception of the call signal, the edit transmission unit (10, S28) refers to the edit content data and transmits the edited call signal to the destination communication device. The call management unit (10, S26, S32) stores the call management data based on the call signal in the memory in response to the reception of the call signal (S26), while the call management data (BYE) is received in response to the reception of the communication disconnection signal (BYE). The call management data is deleted from the memory (S32). The determination unit (20, S45) determines whether call management data is stored in the memory. The update unit (20, S47) updates the edited content data in response to the change command only when it is determined that the call management data is not stored in the memory.

  According to such a configuration, only when there is no “call” referring to the edited content data, a change command for changing the edited content is received and the edited content data is updated. Therefore, the edited content data is not updated during the communication according to the call signal, so that normal communication can be maintained.

DESCRIPTION OF SYMBOLS 10 SIP processing part 11 Management memory 12 Surface reference counter 100 SIP relay apparatus

Claims (6)

A communication relay device that relays a call signal between communication devices via a network to which a plurality of communication devices are connected,
A memory in which editing content data representing the editing content to be applied to the call signal is stored;
An edit transmitting unit that transmits the edited call signal to the communication device as a transmission destination with reference to the editing content data in response to reception of the call signal;
A call management unit for storing call management data based on the call signal in response to reception of the call signal in the memory, and deleting the call management data from the memory in response to reception of a communication disconnection signal;
A determination unit for determining whether or not the call management data is stored in the memory;
An update unit that updates the edited content data only in response to a change command only when the determination unit determines that the call management data is not stored in the memory. apparatus. The edited content data is stored in the first and second areas of the memory, respectively, and one of the first and second areas is used as an operational surface,
The edit transmission unit refers to the edit content data stored in the operation side of the first and second areas, edits the call signal, and then changes the operation side to the operation side. The communication relay device according to claim 1, wherein one of the first and second regions is changed to the other.   When the determination transmission unit determines that the call management data is stored in the memory, the editing transmission unit indicates that the editing content data has not been updated in response to the change instruction. The communication relay device according to claim 1, wherein an error message is transmitted to a source of the change command.   When the determination unit determines that the call management data is stored in the memory, the update unit holds new edited content data in a communication relay device, and then the determination unit 3. The edited content data is updated by overwriting the new edited content data in the memory when it is determined that the call management data is not stored in the memory. The communication relay device according to 1. The communication device is a SIP (Session Initiation Protocol) server,
5. The communication relay apparatus according to claim 1, wherein the communication relay apparatus is an SBC (Session Border Controller) or an SIP server that relays the call signal between the communication apparatuses connected to different networks. The communication relay device according to 1. A relay method for a communication relay device that relays a call signal between communication devices via a network to which a plurality of communication devices are connected,
In response to reception of the call signal, the edit content data is read from a memory in which edit content data representing edit content to be applied to the call signal is stored, and the call signal is edited with reference to the edit content data. Transmitting what has been performed to the communication device of the destination,
Storing call management data based on the call signal in the memory in response to reception of the call signal, and deleting the call management data from the memory in response to reception of a communication disconnection signal;
Determining whether the call management data is stored in the memory;
Only when it is determined that the call management data is not stored, updating the edited content data in response to a change command.

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