JP4906823B2 - Call control method, communication system, and information processing apparatus - Google Patents

Description

  The present invention relates to a call control method, a communication system, and an information processing apparatus for controlling communication between a terminal device that transmits an emergency call and an emergency call reception terminal that receives an emergency call.

  A user terminal accommodated in a VoIP gateway device in a conventional IP network receives an emergency call reception board accommodated in a public telephone network (hereinafter referred to as PSTN: Public Switched Telephone Network), and disconnects from the user terminal As an emergency call call back technology that enables call back from the emergency call reception board, the VoIP gateway device suppresses outgoing calls from the user terminal for a predetermined period after disconnection, As an incoming call to a user terminal, there is one in which only an incoming call to which information indicating that it is an emergency call return call is added is received (for example, see Patent Document 1).

  As a result, the person in charge of the emergency reception desk manually issues a call-back instruction by operating a key or button on the emergency call reception desk, thereby ringing the call bell of the user terminal and calling the user.

  However, when the person in charge of the emergency reception desk talks to the user who is on-hook again, the person in charge of the emergency reception desk rings the user terminal by operating the key or button, the user responds, and the line is set up. I have to wait for a while. In such a case, even if the person in charge of the emergency reception desk wants to hear back to the user, it cannot be immediately heard back. In the event of an emergency, it is necessary to quickly connect to the user terminal and collect information on the emergency situation, but this is not possible.

  As another emergency call call back technology, a VoIP gateway device holds a connection line (session) for an emergency call in a network, rings a user terminal bell in response to a call back signal from an emergency call reception board, And call back connection (for example, see Patent Document 2).

  Thus, as in the above example, the emergency reception desk staff can call the user by ringing the call bell of the user terminal by manually giving a call back instruction by operating the key or button of the emergency call reception desk. It becomes possible.

However, as in the previous example, the call back from the emergency call reception desk is performed by the emergency reception desk staff operating the key or button of the emergency call reception desk, the user terminal rings and the user responds to the line. You have to wait until is set, and you cannot hear back immediately.
JP 2007-228375 A JP 2005-286638 A

  In the conventional emergency call recall technology described above, the emergency call reception desk staff operates the keys or buttons of the emergency call reception desk, and the user terminal bell rings. In this case, the user has to wait for a response until the line is set up.

  Because the call was sent back to the emergency caller in response to a signal from the emergency call reception board, if the signal output timing from the emergency call reception board is delayed, or the routing of the signal call is network congestion, etc. If the call is delayed due to, the call to the emergency caller is delayed and the emergency situation cannot be immediately responded.

  The present invention has been made to solve the above-described problems of the technology, and to speed up line resetting with an emergency call originator when a call is disconnected from the emergency call originator. It is an object of the present invention to provide a call control method, a communication system, and an information processing apparatus that enable the above.

The call control method of the present invention for achieving the above object is a call control method by call control means for controlling a call between a terminal device and an emergency call reception terminal,
Establishing a call of the terminal device and the emergency call acceptance terminal;
Thereafter, when a disconnection of the call from the terminal device, waits for a predetermined time which is determined in advance from there is call disconnection by the terminal device, if there is no disconnection of the call from the emergency call reception terminal within the predetermined time A session establishment request signal for re-establishing a call between the terminal device and the emergency call reception terminal is transmitted to the terminal device.

The communication system of the present invention is a communication system for controlling a call between a terminal device and an emergency call reception terminal,
Wherein after establishing the terminal device and the call of the emergency call receiving terminal, the when a disconnection of the call from the terminal device, waits for a predetermined time which is determined in advance from there is call disconnection by the terminal device, the predetermined time If there is no call disconnection from the emergency call reception terminal, first call control means for transmitting a session establishment request signal for reestablishing the call of the terminal device and the emergency call reception terminal to the terminal device A first information processing apparatus including:
A second call control unit that receives the session establishment request signal from the first information processing apparatus, transmits the session establishment request signal to the terminal apparatus, and reserves a line resource for securing a session; Information processing apparatus,
It is the structure which has.

Furthermore, the information processing apparatus of the present invention is an information processing apparatus that controls a call between a terminal device and an emergency call reception terminal,
Wherein after establishing the terminal device and the call of the emergency call receiving terminal, the when a disconnection of the call from the terminal device, waits for a predetermined time which is determined in advance from there is call disconnection by the terminal device, the predetermined time If the call is not disconnected from the emergency call reception terminal, the call control means for transmitting a session establishment request signal for reestablishing the call of the terminal device and the emergency call reception terminal to the terminal device. is there.

  According to the present invention, the person in charge of emergency call reception can call the terminal device of the emergency call originator without calling the emergency call originator again for the call disconnection from the emergency call originator side. In addition to re-establishing the call, the waiting time until the line is set is shorter than when calling again, and information can be collected earlier from the emergency caller.

  The configuration of the communication system of the present embodiment will be described with reference to the drawings. In the present embodiment, the case of NGN (Next Generation Network) as an IP network will be described.

  FIG. 1 is a block diagram illustrating a configuration example of a communication system according to the present embodiment. As shown in FIG. 1, the communication system of the present embodiment is configured to include NGN 1, terminal device 4, PSTN 6, and emergency call reception board 7. The terminal device 4 is connected to the NGN 1, the PSTN 6 is connected to the NGN 1, and the emergency call reception board 7 is connected to the PSTN 6. In FIG. 1, among the lines connecting the apparatuses, a thin solid line schematically shows a route through which a call control signal is transmitted, and a thick solid line schematically shows a route through which a voice signal is transmitted.

  NGN 1 is a network composed of a service control layer 2 and a packet transfer layer 3. The service control layer 2 is a collection of functions for controlling various services including the subscriber call control device 21 and the relay call control device 22. The packet transfer layer 3 is an aggregate of functions for transferring packets, including the subscriber accommodation router 31 and the media gateway device 32.

  The subscriber call control device 21 is a server having a subscriber session control function, and has call control means (not shown). The operation of the call control means of the subscriber call control device 21 in this embodiment will be described in the operation of the communication system. The relay call control device 22 is a server having a relay session control function, and details of features in this embodiment will be described later.

  The subscriber accommodation router 31 is a router that is connected to the terminal device 4 and transmits and receives packets. The media gateway device 32 is a gateway device that is connected to the PSTN 6 and performs voice signal conversion between the NGN 1 and the PSTN 6.

  The PSTN 6 is a network including a gateway exchange 61 and a subscriber exchange 62. The gateway exchange 61 is an exchange for connecting networks of different operators to each other. The subscriber exchange 62 is an exchange that accommodates telephones, FAX terminals, and the like. The emergency call reception board 7 is a communication terminal such as a telephone or a headset.

  Next, the configuration of the relay call control device 22 will be described in detail.

  FIG. 2 is a block diagram showing a configuration example of the relay call control device shown in FIG. 1, and conceptually shows only the part related to the present invention among the functions of the relay call control device 22.

  The relay call control device 22 includes a call processing control unit 221, a user monitoring unit 222, an emergency call reception board monitoring unit 223, and an emergency call call back control unit 224.

  The call processing control unit 221 processes a SIP signal session establishment request (INVITE) and disconnection (BYE), and further, a call setting request signal and a call setting response signal transmitted to and received from the PSTN 6.

  The user monitoring unit 222 cooperates with the call processing control unit 221 to monitor the BYE transmitted from the terminal device 4 during an emergency call, and when receiving the BYE signal from the terminal device 4, the emergency call call back control unit 224. Notify

  The emergency call reception board monitoring unit 223 cooperates with the call processing control unit 221 to monitor a disconnection signal sent from the emergency call reception board 7 during an emergency call and receive a disconnection signal from the emergency call reception board 7 Then, the emergency call call back control unit 224 is notified.

  The emergency call call back control unit 224 includes an INVITE transmission unit 2241. Upon receiving information from the user monitoring unit 222 that BYE has been received from the terminal device 4 during an emergency call, the emergency call return control unit 224 receives a disconnection signal from the emergency call reception board 7. The emergency call reception board monitoring unit 223 is inquired as to whether or not the call has been made. When it is confirmed from the response from the emergency call reception board monitoring unit 223 that the disconnection signal has not been received from the emergency call reception board 7, the INVITE transmission section 2241 is activated after a predetermined time (timing) has elapsed since the call was disconnected. Then, the PSTN 6 is notified that the terminal device 4 is being called. On the other hand, in response to the above inquiry, if an answer indicating that a disconnection signal has been received from the emergency call reception board 7 is received from the emergency call reception board monitoring unit 223, the INVITE transmission unit 2241 is not activated.

  Note that how long a certain time (timing) is set is determined in advance by the maintenance person for each emergency call type (110, 118, and 119), and is managed in the emergency call call back control unit 224. The call processing control unit 221 and the emergency call call back control unit 224 correspond to the call control means of the present invention.

  When there is an activation instruction from the emergency call call back control unit 224, the INVITE transmission unit 2241 sets the highest priority call display which is a display requesting that the terminal device 4 be treated as the highest priority call in the NGN 1 The INVITE is configured and passed to the call processing control unit 221. INVITE including an emergency call call return call setting request is a kind of INVITE in which the highest priority call display is set.

  Next, the operation of the relay call control device 22 of this embodiment will be described.

  FIG. 3 is a flowchart showing an operation procedure of the relay call control apparatus shown in FIG.

  After the relay call control device 22 puts the emergency call reception board 7 and the terminal device 4 into a call state (step S11), when the user monitoring unit 222 receives the emergency call disconnection of the terminal device 4 (step S12), the emergency call The call back control unit 224 inquires of the emergency call reception board monitoring unit 223 whether or not a disconnection signal has been received from the emergency call reception board 7 (step S13).

  When the emergency call return control unit 224 finds out that the disconnection signal is not received from the emergency call reception board 7 by the notification from the emergency call reception board monitoring unit 223, the emergency call call back control unit 224 notifies the call processing control unit 221 of the fact. When the call processing control unit 221 knows that the call has been disconnected even though the emergency call reception board 7 is not disconnected, the call processing control unit 221 performs resource reservation (step S14). Then, the INVITE transmission unit 2241 forms an emergency call recall INVITE, and passes the INVITE to the call processing control unit 221 (step S15).

  The call processing control unit 221 sends the INVITE received from the INVITE transmission unit 2241 to the terminal device 4 (step S16), and notifies the PSTN 6 that the call is being made (step S17). When the call processing control unit 221 receives the response sent from the terminal device 4 (step S18), the call processing control unit 221 sets the terminal device 4 and the emergency call reception board 7 in a state where a call can be made again. In step 13, if a disconnection signal is received from the emergency call reception board 7 within a certain time, the process is terminated.

  Next, the operation of the communication system of this embodiment will be described.

  FIG. 4 is a sequence diagram illustrating an example of an operation procedure of the communication system according to the present embodiment. FIG. 4 shows the flow of call control signals among the subscriber accommodation router 31, the subscriber call control device 21, the relay call control device 22, the media gateway device 32, the PSTN 6, and the emergency call reception board 7.

  First, in step S1 shown in FIG. 4, the emergency call reception board 7 and the terminal device 4 are connected as follows. When the user operates the terminal device 4 to input an emergency special number (any one of 110, 118, and 119), when the terminal device 4 transmits the emergency special number SIP signal INVITE, the subscriber call control device 21 The INVITE is received via the subscriber accommodation router 31, is expanded into back numbers 0A to J, and the emergency special number is included in the header for setting the emergency special number in the INVITE. When the relay call control device 22 receives the INVITE including the emergency special number, the relay call control device 22 performs routing based on 0A to J whose reverse number is converted by the subscriber call control device 21. Further, the relay call control device 22 determines that the INVITE is an emergency call since the emergency special number (110/118/119) is included in the header for setting the emergency special number in the INVITE, and the PSTN 6 Then, a call setting request signal with the called number as the reverse number is transmitted.

  The gateway switch 61 and the subscriber switch 62 of the PSTN 6 perform routing to the emergency call reception board 7 based on the reverse number of the call setting request signal received from the relay call control apparatus, and the emergency call reception board 7, the media gateway device 32, A call setup response signal is transmitted to the relay call control device 22. When receiving the call setup response signal, the relay call control device 22 transmits a response of the SIP signal to the subscriber call control device 21. When the subscriber call control device 21 receives the response of the SIP signal, the subscriber call control device 21 transmits the response to the terminal device 4 via the subscriber accommodating router 31, and the voice data session between the terminal device 4 and the media gateway device 32. Establish. Thus, in step S1, the emergency call reception board 7 and the terminal device 4 are in a communication state.

  Before the emergency call reception board 7 disconnects the call, the terminal device 4 disconnects the call and transmits the SIP signal BYE to the subscriber call control device 21, so that the relay call control device 22 switches the subscriber call control device 21. Viae is received, and the voice data session between the terminal device 4 and the media gateway device 32 is released.

  In addition, the subscriber call control device 21 suppresses outgoing / incoming calls from the terminal device 4 for a certain period of time in order to reliably realize the call in preparation for incoming call return from the emergency call reception board 7.

  The gateway switch 61 and the subscriber switch 62 of the PSTN 6 hold the line between the media gateway device 32 and the emergency call reception board 7, and the subscriber switch 62 makes a busy tone to the emergency call reception board 7. (BT: Busy Tone) is transmitted to notify that the terminal device 4 has disconnected the call (step S2).

  Further, the subscriber call control device 21 and the relay call control device 22 reserve an emergency call line (session) resource in order to secure a line at the time of call return in preparation for the arrival of a call back from the emergency call reception board 7. (Step S3).

  On the other hand, when receiving the BYE from the terminal device 4, the relay call control device 22 sends the INVITE of the SIP signal to call the user's terminal device 4 that has disconnected the call after a predetermined time (timing) has elapsed. 4 to send. Further, the relay call control device 22 transmits information indicating that the user is being called to the PSTN 6. When the subscriber switch 62 of the PSTN 6 receives information indicating that the user is being called from the relay call control device 22, it stops sending BT to the emergency call reception board 7, and instead, a ringing tone (RBT: Ring Back Tone) Is sent to the emergency call reception board 7.

  In addition, information indicating that it is an emergency call return call setting request is added to INVITE instructing a re-call sent by the relay call control device 22, and is treated as the highest priority call in the NGN 1 (step S4). Hereinafter, information indicating an emergency call call return call setting request is referred to as “highest priority call information”.

  When the subscriber call control device 21 receives the INVITE to which the highest priority call information is added, the subscriber call control device 21 treats the INVITE with priority over other call control signals, stops the incoming call suppression function of the terminal device 4, and performs the incoming call control. When the user responds, the communication state is set again (step S5).

  As a setting method of the highest priority call information added by the relay call control device 22, it may be set to the calling user type for identifying the user of the caller in the INVITE request message transmitted even when calling back. , INVITE request message may be set in other fields, or other newly defined fields may be set.

  When the person in charge of the emergency reception desk hangs up, the emergency call reception base 7 transmits a disconnection signal to the relay call control device 22, and when the relay call control device 22 receives the disconnection signal from the emergency call reception base 7, the BYE terminal The resource transmitted to the device 4 and the resources secured up to that point are released (step S6).

  In the present embodiment, the emergency call return process is performed regardless of the key operation or button operation from the emergency call reception board 7, and the emergency reception desk staff can always return the call to the emergency call sender. Become.

  Next, another operation of the communication system of this embodiment will be described. Here, the completion is a signal intended to complete the call disconnection or other emergency call response from the emergency call reception board 7 almost simultaneously with or immediately after the BYE from the terminal device 4 is received by the relay call control device 22 Assume that a signal is received.

  FIG. 5 is a sequence diagram showing another operation procedure of the communication system of the present embodiment. FIG. 5 shows a case where the reception of BYE from the terminal device 4 and the reception of a call disconnection or completion signal from the emergency call reception board 7 are simultaneous.

  After operating in the same procedure as steps S1 to S5 in FIG. 4, the relay call control device 22 “on-hook” from the emergency call reception board 7 almost simultaneously with or immediately after receiving BYE from the terminal device 4. Is received (step S7), the time when the call disconnection or completion signal from the emergency call reception board 7 is received is before the spontaneous INVITE transmission to the terminal device 4 (step S7). In S8), the emergency call call back control unit 224 causes the INVITE transmission unit 2241 or the call processing control unit 221 to stop the INVITE transmission (Step S9).

  On the other hand, if the relay call control device 22 receives a call disconnection or completion signal from the emergency call reception board 7 after the spontaneous INVITE transmission to the terminal device 4 (step S8), the emergency call call back control The unit 224 causes the call processing control unit 221 to disconnect the connection to the terminal device 4 or stop calling (step S10).

  Here, the case of the call state in step S5 of FIG. 5 has been described, but the same applies to the case of the call state of step S1, and detailed description thereof is omitted.

  As described above, even if there is a call disconnection from the terminal device 4, if there is a call disconnection or completion signal from the emergency call reception desk 7 at the same time or immediately after that, the emergency reception desk staff does not request a call back. In some cases, the intention is reflected, so it is possible to prevent unnecessary lines from being secured.

  According to the present invention, the person in charge of emergency call reception can call the terminal device of the emergency call originator without calling the emergency call originator again for the call disconnection from the emergency call originator side. In addition to re-establishing the call, the waiting time until the line is set is shorter than when calling again, and information can be collected earlier from the emergency caller.

  In the above-described embodiment, the relay call control apparatus has been described as the information processing apparatus provided with the call control means of the present invention. However, the call control means is used in an information processing apparatus other than the relay call control apparatus, such as a gateway apparatus or a router. It may be provided.

It is a block diagram which shows the example of 1 structure of the communication system of this embodiment. FIG. 2 is a block diagram illustrating a configuration example of a relay call control device illustrated in FIG. 1. 3 is a flowchart showing an operation procedure of the relay call control device shown in FIG. 2. It is a sequence diagram which shows an example of the operation | movement procedure of the communication system of this embodiment. It is a sequence diagram which shows another operation | movement procedure of the communication system of this embodiment.

Explanation of symbols

1 NGN
2 Service control layer 3 Packet transfer layer 4 Terminal device 6 PSTN
7 Emergency call reception table 21 Subscriber call control device 22 Relay call control device 31 Subscriber accommodating router 32 Media gateway device 61 Gateway switch 62 Subscriber switch 221 Call processing control unit 222 User monitoring unit 223 Emergency call reception table monitoring unit 224 Emergency Call back control unit

Claims (10)

A call control method by call control means for controlling a call between a terminal device and an emergency call reception terminal,
Establishing a call of the terminal device and the emergency call acceptance terminal;
Thereafter, when a disconnection of the call from the terminal device, waits for a predetermined time which is determined in advance from there is call disconnection by the terminal device, if there is no disconnection of the call from the emergency call reception terminal within the predetermined time A call control method for transmitting a session establishment request signal for re-establishing a call of the terminal device and the emergency call reception terminal to the terminal device.   When there is a call disconnection from the emergency call reception terminal within the predetermined time, without sending a session establishment request signal to the terminal device, when there is a call disconnection from the emergency call reception terminal after the predetermined time, The call control method according to claim 1, wherein the call of the terminal device and the emergency call reception terminal is disconnected.   The call control method according to claim 1 or 2, wherein information for requesting handling as the highest priority call is added to the session establishment request signal and transmitted. A communication system for controlling a call between a terminal device and an emergency call reception terminal,
Wherein after establishing the terminal device and the call of the emergency call receiving terminal, the when a disconnection of the call from the terminal device, waits for a predetermined time which is determined in advance from there is call disconnection by the terminal device, the predetermined time If there is no call disconnection from the emergency call reception terminal, first call control means for transmitting a session establishment request signal for reestablishing the call of the terminal device and the emergency call reception terminal to the terminal device A first information processing apparatus including:
A second call control unit that receives the session establishment request signal from the first information processing apparatus, transmits the session establishment request signal to the terminal apparatus, and reserves a line resource for securing a session; Information processing apparatus,
A communication system. The first call control means includes:
When there is a call disconnection from the emergency call reception terminal within the predetermined time, without sending a session establishment request signal to the terminal device, when there is a call disconnection from the emergency call reception terminal after the predetermined time, The communication system according to claim 4, wherein the call of the terminal device and the emergency call reception terminal is disconnected. The first call control means provides the session establishment request signal with information requesting to be handled as the highest priority call, and transmits the information to the second information processing apparatus.
The second call control means, when receiving the session establishment request signal from the first information processing apparatus, transmits the session establishment request signal to the terminal apparatus with priority over other call control signals. Item 6. The communication system according to item 4 or 5. Further comprising an exchange connected to the emergency call reception terminal via a telephone network;
When the first call control means transmits the session establishment request signal to the terminal device, the first call control means transmits information indicating that the terminal device is being called to the exchange,
7. The exchange according to any one of claims 4 to 6, wherein when receiving information indicating that the terminal device is being called from the first information processing device, the exchange transmits a ringing tone to the emergency call reception terminal. Communication system. An information processing device for controlling a call between a terminal device and an emergency call reception terminal,
Wherein after establishing the terminal device and the call of the emergency call receiving terminal, the when a disconnection of the call from the terminal device, waits for a predetermined time which is determined in advance from there is call disconnection by the terminal device, the predetermined time If there is no call disconnection from the emergency call reception terminal, information processing has call control means for transmitting to the terminal device a session establishment request signal for reestablishing the call of the terminal device and the emergency call reception terminal apparatus. The call control means includes
When there is a call disconnection from the emergency call reception terminal within the predetermined time, without sending a session establishment request signal to the terminal device, when there is a call disconnection from the emergency call reception terminal after the predetermined time, The information processing apparatus according to claim 8, wherein the call of the terminal device and the emergency call reception terminal is disconnected.   The information processing apparatus according to claim 9, wherein the call control unit adds information indicating that it is required to be handled as the highest priority call to the session establishment request signal and transmits the information.

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