JP2009278296A - Ip telephone communication system, sbc device, emergency call priority connection method, and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an SBC (Session Border Controller) device for reliably connecting an emergency call even when the SBC device has reached the maximum number of sessions and reducing influences on services then. <P>SOLUTION: An IP telephone communication system includes the SBC device (1) placed at an access edge of a network and an SIP (Session Initiate Control) server (2) for identifying a priority class/general class of general calls. When an emergency calls occurs in the state that the SBC device (1) has reached the maximum number of sessions, the SBC device (1) links the SIP server (2), disconnects general calls of the general class where a connection has already been established, and secures a session for emergency call. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an IP telephone communication system, an SBC device, an emergency call priority connection method used therefor, and a program therefor, and more particularly to an emergency call connection method in an IP (Internet Protocol) telephone network.

  In the IP telephone network related to the present invention, since call prioritization is not performed, general calls and emergency call calls are handled in the same manner. For example, general calls and emergency call calls are regulated without distinction during congestion. For this reason, a mechanism for preferentially handling important communications such as emergency calls is required.

  As a mechanism for this, in a relay server arranged in an IP telephone network, a situation in which a response cannot be made in the session layer by dynamically determining the number of normal processes / abnormal processes based on the number of processes to be executed. There has been proposed a method of reducing congestion that occurs in the IP telephone network by reducing (see, for example, Patent Document 1).

  As other mechanisms, communication control means for communicating IP voice data with an IP telephone terminal, a voice channel for performing mutual conversion between IP voice data and non-IP voice data, and voice for managing and controlling the voice channel And a method of forcibly securing a voice channel when the voice channel management means determines that the call from the IP telephone terminal is an emergency call and assigning the reserved voice channel to the emergency call. Has also been proposed (see, for example, Patent Document 2).

JP 2006-014021 A JP 2007-013316 A

  In the IP telephone communication system related to the present invention, when only a specific route can be used due to a failure of a detour route due to a disaster or the like, it is newly generated when the number of holding sessions of the device located on the route becomes maximum. There is a problem that an emergency call cannot be connected.

  In the above-mentioned Patent Document 1, congestion that has occurred in the IP telephone network is only eliminated by reducing the situation in which a response becomes impossible at the session layer. When the number of retained sessions is maximized, a newly generated emergency call cannot be connected.

  In the above Patent Document 2, since the voice channel is forcibly secured when it is determined that the outgoing call from the IP telephone terminal is an emergency call, the above problem can be solved, but the priority class / general Since the voice channel is forcibly reserved regardless of the class, there is a problem that the service provided to the user is affected.

  Therefore, the object of the present invention is to solve the above-mentioned problems, and even if the SBC device has reached the maximum number of sessions, an emergency call can be reliably connected, and the influence on the service at that time can be reduced. It is an object to provide an IP telephone communication system, an SBC device, an emergency call priority connection method used therefor, and a program therefor.

An IP telephone communication system according to the present invention includes an IP (Internet) including an SBC (Session Border Controller) device located at an access edge of a network, and an SIP (Session Initiate Protocol) server for identifying a general call priority class / general class. Protocol) a telephone communication system,
When an emergency call occurs in a state where the maximum number of sessions of the SBC device has been reached, the SBC device cooperates with the SIP server to disconnect a general call of a general class that has already been established. An emergency call session is reserved.

An SBC device according to the present invention is an SBC (Session Border Controller) device located at an access edge of a network,
When an emergency call occurs in a state where the maximum number of sessions of the local device has been reached, a connection is already established through cooperation with a SIP (Session Initiate Protocol) server that identifies priority classes / general classes of general calls) Screening means for selecting a general call of a general class, and securing means for disconnecting a session of the selected general call and securing a session for the emergency call.

An emergency call priority connection method according to the present invention includes an SBC (Session Border Controller) device located at an access edge of a network, and an IP (Session Initiate Protocol) server that identifies a priority class / general class of a general call. An emergency call priority connection method used for a telephone communication system,
When an emergency call occurs when the SBC device has reached the maximum number of sessions of the SBC device, the SBC device cooperates with a SIP (Session Initiate Protocol) server that identifies a priority class / general class of a general call) Then, a selection step for selecting a general call of a general class for which a connection has already been established, and a securing step for securing a session for the emergency call by disconnecting the selected general call session are executed.

A program according to the present invention is a program executed by a central processing unit in an SBC (Session Border Controller) device located at an access edge of a network,
When an emergency call occurs in a state where the maximum number of sessions of the local device has been reached, a connection is already established through cooperation with a SIP (Session Initiate Protocol) server that identifies priority classes / general classes of general calls) A selection process for selecting a general call of a general class, and a reservation process for securing a session for the emergency call by disconnecting the selected general call session.

  By adopting the above-described configuration and operation, the present invention can reliably connect an emergency call even if the SBC device has reached the maximum number of sessions, and can reduce the influence on the service at that time. The effect that it can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings. First, an outline of an IP (Internet Protocol) telephone communication system according to the present invention will be described.

  The present invention provides a SIP (Session Initiate Protocol) server when an emergency call occurs in a session border controller (SBC) device located at the access edge of an IP telephony network when the maximum number of sessions of the SBC device has been reached. In this way, the general call that has already been connected is disconnected to secure the session, and the emergency call is connected.

  In the present invention, when an emergency call occurs in a state where the maximum number of sessions of the SBC device has been reached in accordance with the priority class / general class identification of the received packet (general call) by the SIP server, the SBC device Behaves as a pseudo terminal, disconnects a general call in communication with priority over the general class, and secures a session for an emergency call. Therefore, according to the present invention, an emergency call can be connected without greatly affecting the service.

  In other words, in the present invention, the control for configuring the SBC device according to the priority class or general class information identified by the SIP server based on the URI (Uniform Resource Indicator) included in the SIP message of the received packet (general call). The part acts as a pseudo terminal for the SIP server.

  When an emergency call occurs when the maximum number of sessions of the SBC device has been reached, the general class is disconnected preferentially (from the SIP server, it appears that the general class user has disconnected the call). Further, when disconnecting, a voice message to the effect of disconnection is read from the storage unit according to an instruction from the control unit, and the voice message is transmitted to the target user.

  In this way, in the present invention, even when the SBC device has reached the maximum number of sessions, the general call in communication is disconnected to secure the session, and at that time, the general class is preferentially disconnected and the voice is transmitted. Therefore, the emergency call can be reliably connected without greatly affecting the service.

  FIG. 1 is a block diagram showing a configuration example of an IP telephone communication system according to the first embodiment of the present invention. In FIG. 1, the IP telephone communication system according to the first embodiment of the present invention includes an SBC device 1 and a SIP server 2.

  The SBC device 1 includes a control unit 11 [e.g., CPU (Central Processing Unit)], a storage unit 12, and a line unit 13, and the control unit 11 includes an SBC function unit 14. The processing operation of the SBC function unit 14 can be realized by the control unit 11 executing a program stored in the storage unit 12. Further, the SBC function unit 14 may be mounted on the line unit 13.

  The control unit 11 that configures the SBC device 1 makes a response to the SIP server 2 according to the priority class or general class information identified by the SIP server 2 based on the URI included in the SIP message of the received packet (general call). Act as a pseudo terminal.

  When an emergency call occurs in a state where the maximum number of sessions of the SBC device 1 has been reached, the control unit 11 disconnects the general class with priority (from the SIP server 2, the general class user disconnects the call). appear). Further, when disconnecting the call, the control unit 11 instructs the storage unit 12 to read out a voice message indicating that the call is to be disconnected in an emergency, and transmits the voice message to the target user.

Thus, in the present embodiment, even when the SBC device 1 has reached the maximum number of sessions, the general call in communication is disconnected to secure the session, and at that time, the general class is preferentially disconnected, Since the fact is notified to the target user by voice, the emergency call can be reliably connected without greatly affecting the service.

  In the present embodiment, when an emergency call occurs in a state where the maximum number of sessions of the SBC device 1 has been reached according to the priority class / general class identification of the received packet (general call) by the SIP server 2, the SBC device 1 Behaves as a pseudo terminal with respect to the SIP server 2, disconnects the general call in communication before the priority class, and secures an emergency call session. Therefore, in this embodiment, it is possible to connect an emergency call without significantly affecting the service to be provided.

  FIG. 2 is a block diagram showing a detailed configuration example of the SBC function unit 14 of FIG. 2, the SBC function unit 14 includes a session search unit 141, a session table 142, a filter 143, a filter table 144, a session registration / deletion unit 145, a voice message unit 146, and a timer unit 147. It consists of The session table 142, the filter table 144, and the voice message unit 146 can be provided in the storage unit 12, respectively.

  The session search unit 141 searches the session table 142 based on information such as the destination / source IP address / Port and identifies the user's communication session. The filter unit 143 searches the filter table 143 based on the session information stored in the session table 142 for the currently established session, and determines call connection / disconnection.

  Session registration / deletion unit 145 disconnects a session that matches the filter condition, and newly registers a session that is determined to be an emergency call. The voice message unit 146 stores a voice message used when a call is disconnected / connected, and the timer unit 147 limits a call time for an emergency call established by disconnecting an existing call.

  3 and 4 are flowcharts showing the operation of the SBC device 1 of FIG. The operation of the SBC device 1 according to the first embodiment of the present invention will be described with reference to FIGS. Hereinafter, an operation until an emergency call is connected in a state where the number of session connections of the SBC device 1 is maximized will be described. 3 and 4 is realized by the control unit 11 executing a program stored in the storage unit 12.

  When an emergency call occurs when the number of session connections of the SBC device 1 is maximized (steps S1 and S2 in FIG. 3), the SBC function unit 14 of the SBC device 1 stores the session table 142 in the session table 142. Based on the stored current session information, an emergency call and a general call are identified for the session stored in the session table 142 (step S3 in FIG. 3).

  When the session search unit 141 identifies the session stored in the session table 142 as a general call (step S4 in FIG. 3), the SBC function unit 14 transfers the session information to the filter unit 143.

  The criteria for disconnecting a general call in the filter unit 143 are priority / general class, call call time, and voice data capacity. The session registration / deletion unit 145 is instructed to disconnect a session that is a general call and has the longest call call time (see FIG. 3 steps S5, S6). Further, if the call time is the same (step S5 in FIG. 3), the filter unit 143 transfers a session with a large voice data capacity to the session registration / deletion unit 145 to instruct disconnection (step S7 in FIG. 3).

  At the time of disconnection, session registration / deletion unit 145 reads the voice message stored in voice message unit 146, transfers it to the target user, and stores the session information in a temporary storage unit (not shown) (step S8 in FIG. 3). .

  Further, when performing session deletion, the session registration / deletion unit 145 acts as a pseudo-deletion user terminal to the SIP server 2 and transmits a disconnection request (BYE) to the SIP server 2 (step in FIG. 3). S9). When the session registration / deletion unit 145 receives the 200 OK response from the SIP server 2 (step S10 in FIG. 4), it ends the session (step S11 in FIG. 4).

  Furthermore, the session registration / deletion unit 145 newly registers an emergency call for the session secured by disconnecting the general call (step S12 in FIG. 4). The emergency call connected as described above is provided with a call time limit (three minutes) using the timer unit 147, and the voice message stored in the voice message unit 146 is read to the emergency call connection user. A message to disconnect after 3 minutes is transferred (step S13 in FIG. 4).

  The session registration / deletion unit 145 reads the session information of the disconnected general class user from the temporary storage unit after being counted by the timer unit 147 for 3 minutes (step S14 in FIG. 4), and resumes the connection of the general class. (Step S15 in FIG. 4).

  As described above, in the present embodiment, the SBC device 1 cooperates with the SIP server 2 and disconnects a general call during communication to secure an emergency call session. Therefore, the SBC device 1 has reached the maximum number of sessions. However, it is possible to reliably connect an emergency call.

  Further, in the present embodiment, when an emergency call occurs, a general class call is preferentially disconnected, and connection of the general class call is resumed after a certain time, so that the influence on the service can be reduced.

1 is a block diagram showing a configuration example of an IP telephone communication system according to a first embodiment of the present invention. It is a block diagram which shows the detailed structural example of the SBC function part of FIG. It is a flowchart which shows operation | movement of the SBC apparatus of FIG. It is a flowchart which shows operation | movement of the SBC apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 SBC apparatus 2 SIP server 11 Control part 12 Storage part 13 Line part 14 SBC function part 141 Session search part 142 Session table 143 Filter 144 Filter table 145 Session registration / deletion part 146 Voice message part 147 Timer part

Claims (16)

An IP (Internet Protocol) telephone communication system including an SBC (Session Border Controller) device located at an access edge of a network and an SIP (Session Initiate Protocol) server for identifying a priority class / general class of a general call,
When an emergency call occurs in a state where the maximum number of sessions of the SBC device has been reached, the SBC device cooperates with the SIP server to disconnect a general call of a general class that has already been established. An IP telephone communication system characterized by securing a session for an emergency call.   2. The IP according to claim 1, wherein the SIP server identifies whether the general call is the priority class or the general class based on a URI (Uniform Resource Indicator) included in a SIP message of the general call. Telephone communication system.   The IP telephone communication system according to claim 1 or 2, wherein the SBC device behaves as a pseudo terminal with respect to the SIP server.   4. The SBC device according to any one of claims 1 to 3, wherein when the general call is disconnected, the target user terminal is notified by an audio message that the emergency call is to be disconnected. IP telephone communication system.   The IP telephone communication system according to any one of claims 1 to 4, wherein the SBC device notifies the connected user of the emergency call that the user is disconnected after a predetermined time. An SBC (Session Border Controller) device located at the access edge of the network,
When an emergency call occurs in a state where the maximum number of sessions of the local device has been reached, a connection is already established through cooperation with a SIP (Session Initiate Protocol) server that identifies priority classes / general classes of general calls) An SBC apparatus comprising: a selecting unit that selects a general class of general calls; and a securing unit that disconnects the selected general call session and secures a session for the emergency call.   The screening means is configured to determine whether the general call in the SIP server is the priority class or the general class on the basis of a URI (Uniform Resource Indicator) included in the SIP message of the general call, based on the identification result of the general class. 7. The SBC device according to claim 6, wherein a general call is selected.   8. The SBC device according to claim 6, wherein the SBC device behaves as a pseudo terminal with respect to the SIP server.   9. The SBC device according to claim 6, wherein when the general call is disconnected, the target user terminal is notified by an audio message that the user terminal is to be disconnected in an emergency.   The SBC device according to any one of claims 6 to 9, wherein the emergency call connection user is notified of a disconnection after a predetermined time. Emergency call used in an IP (Internet Protocol) telephone communication system including an SBC (Session Border Controller) device located at the access edge of a network and an SIP (Session Initiate Protocol) server for identifying a general call priority class / general class A preferred connection method,
When an emergency call occurs when the SBC device has reached the maximum number of sessions of the SBC device, the SBC device cooperates with a SIP (Session Initiate Protocol) server that identifies a priority class / general class of a general call) A selection step for selecting a general call of a general class to which a connection has already been established, and a securing step for disconnecting the selected general call session and securing a session for the emergency call. Emergency call priority connection method.   12. The emergency according to claim 11, wherein the SIP server identifies whether the general call is the priority class or the general class based on a URI (Uniform Resource Indicator) included in a SIP message of the general call. Call priority connection method.   The emergency call priority connection method according to claim 11 or 12, wherein the SBC device behaves as a pseudo terminal with respect to the SIP server.   The said SBC apparatus notifies that it cut | disconnects by an emergency to the user terminal used as object when disconnecting the said general call by the voice message. Emergency call priority connection method.   The emergency call priority connection method according to any one of claims 11 to 14, wherein the SBC device notifies a connection user of the emergency call that the user is disconnected after a predetermined time. A program executed by a central processing unit in an SBC (Session Border Controller) device located at an access edge of a network,
When an emergency call occurs in a state where the maximum number of sessions of the local device has been reached, a connection is already established through cooperation with a SIP (Session Initiate Protocol) server that identifies priority classes / general classes of general calls) A program comprising: a selection process for selecting a general call of a general class, and a reservation process for disconnecting a session of the selected general call to secure a session for the emergency call.

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