JP4628966B2 - Session control method, communication system, and connection instruction device - Google Patents

Description

The present invention is a session control method for providing a session control using I P (I nternet P rotocol) , the service value-added to the session control, communication systems,及 Beauty, for the connection instruction device.

  In recent years, communication using SIP (Session Initiation Protocol) has been developed for VoIP (Voice Over IP), multimedia communication, etc., and the number of users tends to increase in the future. SIP is a standardized protocol used for control of voice communication using IP (for example, see Non-Patent Document 1 and Non-Patent Document 2). However, unlike conventional telephones, VoIP communication is cheaper or free of charge. For this reason, network operators need to consider providing additional services and increasing their profits from usage fees.

  In the conventional form of providing additional services on the telephone network, a telephone call is made from a telephone to an exchange, and the exchange makes an inquiry about a connection destination to a network service control node such as an SCP (Service Control Point) (for example, non-patent Reference 3). However, since the information held by the exchange is different, this is a method in which the functions of the additional service providing part of the exchange are integrated into the SCP, etc., and between the telephone and the exchange, between the exchange and the SCP, etc. Protocol conversion between them is necessary. Therefore, the development cost of protocol conversion tends to be high, and when converting to a unique protocol, development is required for each system, resulting in double investment.

  On the other hand, in the case of SIP widely adopted in VoIP, there is basically no difference in information that can be held by the SIP server. For this reason, it is possible to provide an additional service without performing SIP protocol conversion by adopting a method in which an entity (node) that provides a service is installed outside, rather than the idea of adding a function to the SIP server.

As a feature of SIP, since a connection destination instruction (session control) is performed by a UA (User Agent) operation, in order to control a session on the SIP server, it is necessary to embed the UA function in the proxy function in the SIP server. there were. Since this is functionally complicated, when providing an additional service by communication using SIP such as VoIP, a method of installing a high-function server that performs UA operation separately from the SIP server is suitable. Conceivable. Further, regarding session information, it is necessary to select a method for retaining session information and a method for not retaining session information according to the necessity of a service to be provided, instead of retaining the session information uniformly in the server.
J. Rosenberg et al., “RFC3261 SIP: Session Initiation Protocol (SIP)” [online], June 2002, Internet Engineering Task Force, [Search June 27, 2005] Internet <URL: http://www.ietf.org/rfc/rfc3261.txt> R. Sparks et al., “RFC3515 SIP: The Session Initiation Protocol (SIP) Refer Method”, [online], April 2003, Internet Engineering Tasks Force (Internet Engineering Task Force), [Search June 27, 2005], Internet <URL: http://www.ietf.org/rfc/rfc3261.txt> Nippon Telegraph and Telephone, "Communication Network Technology", [online], 1998, Nippon Telegraph and Telephone Corporation, [Search June 27, 2005], Internet <URL: http://www.ntt.co.jp/ RD / OFIS / active / 1998pdf / tn.pdf>

When the above-described conventional technology used for providing additional services for the telephone network is applied to a communication system using SIP, there are the following problems.
(1) When a high function server for providing additional services is accessed from a SIP server when a SIP session is connected, if the high function server is controlled by the same control / controlled function sharing as the conventional telephone network, Protocol conversion was necessary in the server, and the development cost tended to be high.
(2) If protocol conversion is made into a unique protocol, investment for development is required for each system, and there is a risk of double investment.
(3) Since the SIP controls the session by the UA operation, a high function server that performs the UA operation is required instead of the proxy operation like the SIP server.
(4) If a method of uniformly holding session information is adopted, the processing load on the high-function server increases.
(5) In order to provide an additional service attractive to the user, it is necessary to provide connection instructions from the high-function server in various forms.
(6) Since SIP does not handle media signals (voice signals, PB (Push Button) signals, etc.), SIP session control using media signals is impossible. In addition, media information cannot be controlled by SIP.

The present invention has been made in view of such circumstances, and an object, in the communication system using the S I P, by performing the flexible session control, hold suppress the processing load and costs, various session control method capable of realizing Do additional services, communication system,及 beauty is to provide a connection instruction device.

In order to solve the above problems, the present invention provides a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection. In the session control method used, a source terminal device transmits a SIP signal requesting the start of a session to the communication control device, and the communication control device requests a session start from the source terminal device. A SIP signal to be transmitted, and the received SIP signal is transmitted to the connection instruction device. The connection instruction device receives an SIP signal requesting the start of a session from the communication control device, and of the session pending by holding the session information on a session, a connection destination based on outbound request destination information included in the received SIP signal Constant, and returns the SIP signal instructing connection to the determined destination of the terminal device to the communication control device a result, it releases the session with the source terminal, the communication control device, the communication control device A SIP signal instructing connection to the terminal device of the connection destination from the terminal device, transmitting a SIP signal requesting the start of a session to the terminal device of the connection destination instructed by the received SIP signal, and the terminal device of the connection destination Is a session control method that receives a SIP signal requesting the start of a session from the connection instruction device and establishes a session with a terminal device as a transmission source.

The present invention also provides a session control method used in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection. The source terminal device transmits a SIP signal requesting the start of a session to the communication control device, and the communication control device receives a SIP signal requesting the start of the session from the source terminal device. The received SIP signal is transmitted to the connection instructing device, and the connection instructing device receives an SIP signal requesting the start of a session from the communication control device and receives session information related to the session with the source terminal device. The session is suspended, the connection destination is determined based on the information of the call request destination included in the received SIP signal, and the communication control is performed. A SIP signal for requesting the start of a session with the determined connection destination terminal device is transmitted via the control device, the session with the connection destination terminal device is connected, and the call is transmitted to the communication control device. A SIP signal instructing connection of a session between the source and the connection destination terminal device is transmitted, and the connection destination terminal device transmits the communication source to the source terminal and the connection destination terminal device. A SIP signal instructing the connection of the session between them is received, the session is connected based on the SIP signal, and the session connection between the source terminal and the connection destination terminal device is performed A SIP signal is transmitted to the communication control device, and the connection instruction device indicates that a session connection between the source device and the connection destination terminal device has been performed via the communication control device. Upon receiving the IP signal, to open a session and a session with the destination terminal device and the source terminal, a session control method characterized by.

The present invention also provides a session control method used in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection. The source terminal device transmits a SIP signal requesting the start of a session to the communication control device, and the communication control device receives a SIP signal requesting the start of the session from the source terminal device. The received SIP signal is transmitted to the connection instructing device, and the connection instructing device receives an SIP signal requesting the start of a session from the communication control device and receives session information related to the session with the source terminal device. The session is suspended, the connection destination is determined based on the information of the call request destination included in the received SIP signal, and the communication control is performed. Via the control device, a SIP signal requesting the start of a session with the source terminal device is transmitted to the determined connection destination terminal device to connect the session with the connection destination terminal device, A session control method characterized in that a session connected with a connection destination terminal device and a session held with the transmission source terminal device are connected .

The present invention also provides a session control method used in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection. The source terminal device transmits a SIP signal requesting the start of a session to the communication control device, and the communication control device receives a SIP signal requesting the start of the session from the source terminal device. The received SIP signal is transmitted to the connection instructing device, and the connection instructing device receives an SIP signal requesting the start of a session from the communication control device and receives session information related to the session with the source terminal device. The session is suspended, the connection destination is determined based on the information of the call request destination included in the received SIP signal, and the communication control is performed. Sending a SIP signal requesting the start of a session with the source terminal device to the determined connection destination terminal device without going through the control device, and connecting the session with the connection destination terminal device, A session control method comprising: connecting a session connected to the connection destination terminal device and a session held on hold with the source terminal device .

  Further, the present invention is the session control method described above, wherein the connection instruction device receives a SIP signal requesting the start of a session from the communication control device and holds the session with the terminal device of the transmission source. The connection destination is determined based on the information of the call request destination included in the received SIP signal, and the SIP signal for requesting the start of the session is transmitted to the determined connection destination terminal device without going through the communication control device. Then, a session with the connection destination terminal device is connected, and a session connected with the connection destination terminal device and a session held with the transmission source terminal device are connected. It is characterized by that.

  Further, the present invention is the session control method described above, wherein the communication control apparatus transmits an SIP signal requesting start of a session to the connection destination terminal apparatus, and then the transmission source and the connection destination terminal When a session between devices is not established, a SIP signal notifying that a session between terminal devices has not been established is transmitted to the connection instruction device, and the connection instruction device establishes a session between terminal devices. Receiving a SIP signal notifying that a connection has not been made, determining another connection destination, and returning a SIP signal instructing connection to the determined other connection destination terminal device to the communication control device. And

  The present invention is the session control method described above, wherein the communication system further includes a media device that processes media information, and the connection instruction device requests the start of a session from the communication control device. A signal is received, and the received SIP signal is transmitted to the media device. The media device receives a SIP signal requesting the start of a session from the connection instruction device, and performs a session with the originating terminal device. Connect, receive a media signal from the originating terminal device, notify the connection instruction device of the received media signal information by a SIP signal, and the connection instruction device indicates the SIP signal received from the media device A SIP signal for requesting the start of a session is transmitted to the terminal device of the connection destination indicated by the media signal information, Connecting a session with the continued previous terminal device, characterized in that.

  Further, the present invention is the session control method described above, wherein the connection instruction device notifies the media device of a session establishment result with the connection destination terminal by an SIP signal, and the media device Media information corresponding to a session establishment result indicated by the SIP signal received from the instruction device is transmitted to the terminal device.

The present invention is also a communication system comprising a terminal device that transmits / receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection. The control device receives a SIP signal for requesting the start of a session from the source terminal device, transmits the received SIP signal to the connection instruction device, and connects the connection instruction device to the connection destination terminal device. A communication control means for receiving a SIP signal to instruct and transmitting a SIP signal for requesting the start of a session to a connection destination terminal device instructed by the received SIP signal, wherein the connection instruction device receives a session from the communication control device; The session is received by receiving the SIP signal requesting the start of the session and holding session information regarding the session with the terminal device of the transmission source. Receiving means for holding, connection destination determining means for determining the connection destination based on the information of the call request destination included in the SIP signal received by the receiving means, and the terminal device of the connection destination determined by the connection destination determining means When a SIP signal instructing connection to the communication control device is returned to the communication control device, the session with the source terminal device is released, or the session with the connection destination terminal device determined by the connection destination determination means is Connecting, transmitting to the communication control device a SIP signal instructing connection of a session between the transmission source and the connection destination terminal device, and via the communication control device, the transmission source and the connection destination When the SIP signal indicating that the session connection between the terminal devices is received, the session with the source terminal device and the session with the connection destination terminal device are released. The and a connection selection means for the connection destination of the terminal device is selected according to the service subscription, a communication system, characterized in that.

The present invention is also a communication system comprising a terminal device that transmits / receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection. The control device receives a SIP signal for requesting the start of a session from the source terminal device, transmits the received SIP signal to the connection instruction device, and connects the connection instruction device to the connection destination terminal device. A communication control means for receiving a SIP signal to instruct and transmitting a SIP signal for requesting the start of a session to a connection destination terminal device instructed by the received SIP signal, wherein the connection instruction device receives a session from the communication control device; The session is received by receiving the SIP signal requesting the start of the session and holding session information regarding the session with the terminal device of the transmission source. Between the receiving means for holding, the connection destination determining means for determining the connection destination based on the information of the transmission request destination included in the SIP signal received by the reception means, and the terminal device of the transmission source and the connection destination Instruct session connection to release the held session, or connect a session with the connection-destination terminal device, and connect the session with the connection-destination terminal device and the source terminal A communication selection system comprising: a connection selection unit configured to select whether to connect a session held with an apparatus according to a service subscribed to by the connection destination terminal apparatus .

Further, the present invention includes a terminal device for transmitting and receiving a SIP signal, in the connection instruction device in a communication system comprising a communication control unit for transferring SIP signal, and a connection instruction device for instructing the connection to determine the connection destination Receiving means for holding a session by receiving a SIP signal requesting the start of a session from the communication control apparatus and holding session information related to the session with the originating terminal apparatus; and the receiving means A connection destination determination unit that determines a connection destination based on information of a transmission request destination included in the received SIP signal, and a SIP signal that instructs connection to the terminal device of the connection destination determined by the connection destination determination unit When returned to the communication control device, the session with the source terminal device is released, or with the connection destination terminal device determined by the connection destination determination means A SIP signal instructing the communication control device to connect a session between the transmission source and the connection destination terminal device, and via the communication control device, the transmission source and the communication device. When a SIP signal indicating that a session connection between connection destination terminal devices has been received is received, a session with the call source terminal device and a session with the connection destination terminal device are released, or and connection selection means for connection of the terminal device is selected according to the service subscription, a connection instruction apparatus comprising: a.

The present invention also provides the connection instruction device in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection. Receiving means for holding a session by receiving a SIP signal requesting the start of a session from the communication control apparatus and holding session information related to the session with the originating terminal apparatus; and the receiving means Connection destination determination means for determining a connection destination based on information of a transmission request destination included in the received SIP signal, and instructing connection of a session between the terminal device of the transmission source and the connection destination and holding the connection Open the session or connect the session with the connection destination terminal device and connect the session with the connection destination terminal device and the call origination. Connection instruction device, characterized in that it comprises a connection selecting means for selecting according to a service or to connect the session that was pending, the said connection destination of the terminal device to join with the original terminal It is.

According to the present invention, session control can be flexibly performed in a communication system using SIP. For example, the connection instruction device can connect the terminal devices without holding a session according to the necessity of the service, and can reduce the load of managing session information in the connection instruction device. In addition, the connection instructing device mediates the session between the terminal devices, so that the connection instructing device can grasp the state of the call and collect the call log.
Further, since protocol conversion is not performed in the communication control device, the development cost can be reduced, and the possibility of double investment is reduced as compared with the case where a unique protocol is adopted. In addition, since the communication control device and connection instruction device are connected using SIP, which is a standardized protocol, not only specific products but also other general-purpose products that support SIP can be interconnected. Services can be provided.
In addition, the SIP session can be controlled by operating a media signal (PB signal or the like) from the terminal device. Further, it is possible to control the transmission of media information according to the call state according to the connection result of the SIP session.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an overall configuration of a communication system according to an embodiment of the present invention.
In the figure, the communication system includes a terminal device 11 on a transmission side (originating) and a terminal device 12 on a connection destination (destination) that transmit and receive a SIP (Session Initiation Protocol) signal (also referred to as “SIP request”), and a proxy operation. The SIP server 13 (communication control device) that establishes a SIP session between the terminal devices and connects to the SIP server 13 receives an inquiry about the connection destination by SIP, determines the caller ID and date, and determines the connection destination. A media server 19 (media device; hereinafter referred to as “MS19”) that receives or transmits a media signal between the high-performance server 14 (connection instruction device) that provides a value-added service by instructing and the terminal device 11 Are connected by an IP (Internet Protocol) network.

  The terminal devices 11 and 12 are, for example, VoIP (Voice over IP) terminals that implement the SIP protocol. The terminal devices 11 and 12 are connected to the SIP server 13 in order to send and receive SIP signals between the terminal devices via the SIP server 13, and for the final call shown by reference numeral 15, the terminal devices 11 and 12 It is equipped with a function for performing media communication directly between the twelve. Further, the terminal device 11 is equipped with a function of performing direct media communication with the MS 19 and transmitting a PB signal as indicated by reference numeral 20.

  The SIP server 13 is equipped with a proxy function for connecting the terminal devices 11 and 12 by SIP. In addition, the SIP server 13 has a function of communicating with the high function server 14 by SIP. The SIP server 13 makes a connection destination inquiry by SIP to the high function server 14 in order to provide an additional service, receives a connection instruction by SIP from the high function server 14 as a response, and sends it to the terminal device 12 of the connection destination. Send connection instructions.

  The high function server 14 includes a SIP control unit 16 (reception unit, transmission unit), a connection destination determination unit 17 (connection destination determination unit), and a connection destination determination database 18 (hereinafter, “database” is described as “DB”). . The SIP control unit 16 transmits and receives SIP signals between the SIP server 13 and the MS 19. The connection destination determination DB 18 holds data for determining a connection destination. When the SIP control unit 16 receives a connection destination inquiry from the SIP server 13, the connection destination determination unit 17 accesses the connection destination determination DB 18 to determine the connection destination and transmits a connection instruction to the SIP server 13. The controller 16 is instructed. Further, when the SIP control unit 16 receives the information of the media signal transmitted from the terminal device 11 from the MS 19, the connection destination determination unit 17 instructs the SIP server 13 to connect to the connection destination indicated by the information of the media signal. The SIP control unit 16 is instructed to transmit. When the SIP control unit 16 receives the call connection result from the SIP server 13, the SIP control unit 16 is instructed to notify the MS 19 of the call status.

  The MS 19 establishes a SIP session with the terminal device 11 via the SIP server 13 and the high function server 14, and connects a media session directly to the terminal device 11 as indicated by reference numeral 20 to perform media communication. Equipped with a function to perform. The MS 19 receives a media signal such as an audio signal or a PB (Push Button) signal from the terminal device 11 by media communication, and notifies the high function server 14 of the received media signal information by SIP. Further, the call state notification is received from the high function server 14 by SIP, and a media signal such as voice corresponding to the call state is transmitted to the terminal device 11.

FIG. 2 is a diagram illustrating a configuration example of the connection destination determination DB 18.
In the figure, the connection destination determination DB 18 holds a contractor number management DB, a connection condition DB, an originating ID (IDentifier) group management DB, a date / time group management DB, a holiday management DB, and a connection destination management DB.

  The contractor number management DB holds information on services subscribed to by the contractor for each contractor number. In the figure, the subscriber with the contractor number “050-0001-0001” is assigned to the “forwarding” service, and the subscriber with the subscriber number “050-0002-0002” is assigned to the “reject” (reject call) service. The contractor with the contractor number “050-0003-0003” is subscribed to the “call history management” service, and the contractor with the contractor number “050-0004-0004” is subscribed to the “conditional connection” service. Show.

  For each contractor number, the connection condition DB holds information on the number of the calling ID group used by the contractor, the number of the date / time group, and the valid date / time of these setting contents. In the figure, for the subscriber number “050-0001-0001”, the calling ID group number “1” and the date group number “2” are valid after the effective date “2005/1/1 14:00”. The effective date and time “2005/1/10 10:00” and thereafter indicate that the calling ID group number “2” and the date and time group number “3” are valid.

  For each contractor number, the calling ID group management DB holds information on the calling ID group number used by the contracting party and information on the calling party number belonging to the calling ID group. In the same figure, the caller ID group with the caller ID group number “1” used by the contractor number “050-0001-0001” has a caller ID beginning with “03”, and the caller ID with the caller ID group number “2”. This indicates that the caller number starting with “0422-59-” belongs to the group.

  The date / time group management DB holds, for each contractor, information on the date group number used by the contractor and the date / day / holiday, start time, and end time specified by the date group. In the figure, the date and time of the date group number “2” used by the contractor number “050-0001-0001” is the start time “10:00” to the end time “12:00” of “Monday”. The date “3” indicates that the “holiday” has a start time “9:00” to an end time “18:00”.

  The holiday management DB shows information on holidays. In the figure, “1/1” (January 1), “1/2” (January 2), “1/3” (January 3),... Indicate holidays.

  For each contractor number, the connection destination management DB holds the number of chasing times and information of the connecting destination corresponding to the chasing frequency. The number of chasing times is the number of times the connection destination is designated. For example, when the incoming call cannot be made to the connection destination, the number of chase increases and the next connection destination is instructed. In the figure, for the contractor number “050-0001-0001”, when the number of tracking is “1”, the connection destination is “050-1234-5678”, and when the number of tracking is “2”, This indicates that the connection destination is “050-1111-1111”.

<First embodiment>
In the first embodiment, a session control method will be described in the case where the callee number is subscribed to a conditional connection service (such as a call rejection service from a specific caller).
In FIG. 1, when the user performs a call operation to the terminal device 11, the terminal device 11 calls the SIP server 13. When the call destination number is subscribed to the conditional connection service, the SIP server 13 inquires of the high function server 14 whether it is a connection rejection number. The high function server 14 determines whether it is a connection refusal number and transmits a connection instruction to the SIP server 13, and then releases the session information.

FIG. 3 is a diagram showing an operation flow of the conditional connection service of the high function server 14 according to the first embodiment.
When the user performs a call operation on the terminal device 11, the terminal device 11 transmits a session activation signal (INVITE signal) for requesting a call to the SIP server 13. The session activation signal (INVITE signal) includes a caller number indicating the number of the terminal device 11 that is the caller and information on the callee number. The SIP server 13 rewrites the destination of the received session activation signal (INVITE signal) to the address of the high function server 14 and transmits it. The SIP control unit 16 of the high-function server 14 receives a session activation signal (INVITE signal) as a connection destination inquiry signal by SIP from the SIP server 13, and holds the state (step S21). That is, the SIP control unit 16 holds session information regarding a session with the terminal device 11.

  Subsequently, the connection destination determination unit 17 accesses the connection destination determination DB 18 to acquire the connection destination information in order to instruct the SIP server 13 of the connection destination (or connection refusal) (step S22). For connection destination determination processing, see the fourth embodiment described later. As a response to the connection destination inquiry signal, the SIP control unit 16 transmits the connection destination information acquired by the connection destination determination unit 17 to the SIP server 13 using the SIP signal, and instructs connection or connection rejection (step S23). When the connection instruction to the SIP server 13 ends, the SIP control unit 16 of the high function server 14 releases the session information held in the high function server 14 (step S24).

  On the other hand, when the connection destination information received from the high function server 14 indicates the connection destination number or address, the SIP server 13 sends a session activation signal (INVITE signal) to the terminal device 12 indicated by the connection destination information. ) And a SIP signal instructing the terminal device 11 to disconnect the call is transmitted. When the terminal device 12 receives the session activation signal (INVITE signal) and accepts the incoming call, the terminal device 12 transmits an SIP signal (180 Ringing) notifying that the calling is in progress to the terminal device 11 via the SIP server 13, and the SIP session is transmitted. Connecting. When the user responds by the terminal device 12, the terminal device 12 transmits a SIP signal (200 OK) for notifying the response to the terminal device 11 via the SIP server 13, and the terminal device 11 responds via the SIP server 13. (ACK) is returned. A media session for transmitting and receiving media signals is connected between the terminal devices 11 and 12, and a final call 15 (see FIG. 1) is performed.

<Second Embodiment>
In the second embodiment, a session control method when the callee number is subscribed to a transfer service (hold transfer or the like) will be described.
In FIG. 1, when the user performs a call operation to the terminal device 11, the terminal device 11 calls the SIP server 13. When the call destination number is subscribed to the transfer service, the SIP server 13 inquires of the high function server 14 about the connection destination as the transfer destination. The high function server 14 suspends the session between the terminal device 11 and the high function server 14, performs transfer destination determination processing, makes a call to the SIP server 13, and the high function server 14 and the transfer destination terminal device 12. Hold the session between. Thereafter, the high function server 14 transmits an instruction (REFER signal) to connect the terminal devices to the SIP server 13 to connect the terminal devices 11 and 12 to each other, and then connects the terminal devices 11 and 12 to each other. Release session information.

FIG. 4 is a diagram showing an operation flow of the transfer service of the high function server 14 according to the second embodiment.
In the same figure, as in the first embodiment, the SIP control unit 16 of the high function server 14 receives a session activation signal (INVITE signal) as a connection destination inquiry signal from the SIP server 13 (step S31). . The SIP control unit 16 holds the session between the terminal device 11 that is the transmission source and the high function server 14, and holds session information related to this session (step S32). The connection destination determination unit 17 accesses the connection destination determination DB 18 in order to instruct the SIP server 13 of the connection destination, and acquires connection destination (transfer destination) information (step S33). For connection destination determination processing, see the fourth embodiment described later.

  The SIP control unit 16 transmits a session activation signal (INVITE signal) as a connection instruction to the terminal device 12 indicated by the connection destination information acquired by the connection destination determination unit 17 via the SIP server 13 and makes a call. (Step S34). Thereby, the high function server 14 connects a session with the terminal device 12 of the connection destination, and holds session information regarding this session (step S35). After connection of the session with the terminal device 12, the SIP control unit 16 transmits an SIP signal (REFER signal) instructing to connect the terminal devices to the SIP server 13 (step S36). In the REFER signal, information on the address of the terminal device 12 to be connected is set.

  The SIP server 13 transmits a REFER signal to the terminal device 11 that is the transmission source. The terminal device 11 transmits a session activation signal (INVITE signal) to the connection destination terminal device 12 indicated by the received REFER signal. Thereby, the session between the terminal devices 11 and 12 is connected. When the session between the terminal devices 11 and 12 is connected, the terminal devices 11 and 12 transmit an SIP signal notifying that the session connection has been made to the SIP server 13, and the SIP server 13 receives the received signal. The SIP signal is transmitted to the high function server 14. The SIP control unit 16 of the high function server 14 releases the session information of the session with the terminal device 11 and the session with the terminal device 12 (step S37).

<Third embodiment>
In the third embodiment, a session control method will be described in the case where the callee number is subscribed to a state management service (call history management, etc.).
In FIG. 1, when the user performs a call operation to the terminal device 11, the terminal device 11 calls the SIP server 13. When the call destination number is subscribed to the state management service, the SIP server 13 inquires of the high function server 14 about the connection destination. The high function server 14 suspends the session between the terminal device 11 and the high function server 14, performs connection destination determination processing, calls the SIP server 13, and the high function server 14 and the connection destination terminal device 12. Connect a session with. Thereafter, both sessions are connected by the high-function server 14 to connect the sessions between the terminal devices of arrival and departure.

FIG. 5 is a diagram showing an operation flow of the transfer service of the high function server 14 according to the third embodiment.
In the same figure, as in the first embodiment, the SIP control unit 16 of the high function server 14 receives a session activation signal (INVITE signal) as a connection destination inquiry signal from the SIP server 13 (step S41). . The SIP control unit 16 holds the session between the terminal device 11 and the high function server 14 and holds session information regarding this session (step S42). The connection destination determination unit 17 accesses the connection destination determination DB 18 and obtains connection destination information in order to instruct the SIP server 13 of the connection destination (step S43). For connection destination determination processing, refer to the fourth embodiment described later.

  The SIP control unit 16 transmits a session activation signal (INVITE signal) as a connection instruction to the terminal device 12 indicated by the connection destination information acquired by the connection destination determination unit 17 via the SIP server 13 and makes a call. (Step S44). Thereby, the high function server 14 connects the session with the terminal device 12 of the connection destination, and holds the session information regarding this session (step S45). After connection of the session with the terminal device 12, the SIP control unit 16 performs a session between the terminal device 11 of the transmission source and the high function server 14, and between the high function server 14 and the terminal device 12 of the connection destination. Sessions are connected (step S46). Thereby, since the SIP signal transmitted / received between the terminal devices 11 and 12 passes through the high function server 14, the high function server 14 grasps the event of the call generated between the terminal devices 11 and 12 by this SIP signal. , Call history information can be written inside.

  In step S44, the SIP control unit 16 of the high-function server 14 directly starts the session with respect to the terminal device 12 indicated by the connection destination information acquired by the connection destination determination unit 17 without using the SIP server 13. A signal (INVITE signal) may be transmitted to make a call. The high function server 14 directly connects a session with the connection destination terminal device 12 and holds session information regarding the session. Thereafter, the SIP control unit 16 of the high function server 14 connects the session between the terminal device 11 of the transmission source and the high function server 14 and the session between the high function server 14 and the terminal device 12 of the connection destination. Combine.

<Fourth embodiment>
In the fourth embodiment, connection destination determination processing in the first, second, and third embodiments will be described.
FIG. 6 is a diagram illustrating an operation flow of the connection destination determination process in the high function server 14.
The SIP control unit 16 of the high function server 14 receives a session activation signal (INVITE signal) as a connection destination inquiry signal from the SIP server 13 and sets the number of connections to “1” (step S51). The connection destination determination unit 17 accesses the contractor number management DB (see FIG. 2) using the contractor number indicated by the callee number information in the received session activation signal (INVITE signal) as a key. It is determined whether or not there is a contractor number (step S52). When there is no corresponding contractor (step S52: NO), the connection destination determination unit 17 transmits a call disconnection instruction to the SIP server 13 and releases session information related to the session with the terminal device 11 that is the transmission source. (Step S60).

  If there is a corresponding contractor number in step S52 (step S52: YES), the connection destination determination unit 17 uses the contractor number as a key to determine the connection destination number, and the connection condition DB (FIG. 2). First, the connection destination determination unit 17 refers to the record specified by using the contractor number as a key, and determines whether or not the current time is after the valid date (step S53). If it is determined that the date is before the valid date (step S53: NO), the SIP control unit 16 of the high function server 14 directly connects to the subscriber number indicated by the connection destination number included in the session activation signal (INVITE signal). The instruction is transmitted to the SIP server 13 by the SIP signal, and the session information related to the session with the terminal device 11 as the transmission source is released (step S61).

  If it is determined in step S53 that the date is after the valid date (step S53: YES), the connection destination determination unit 17 determines whether or not there is a condition designation in the originating ID group. This is determined by whether or not the calling ID group number is set in the record of the connection condition DB specified by using the contractor number as a key. When the caller ID group number is set, the connection destination determination unit 17 accesses the caller ID group management DB (see FIG. 2) using the contractor number and the caller ID group number as keys. Then, depending on whether or not the caller number set in the session activation signal (INVITE signal) is included in the caller number in the record specified by using the contractor number and the calling ID group number as a key, It is determined whether the person number is in the calling ID group (step S54). When the connection destination determination unit 17 determines that the caller ID of the terminal device 11 that is the caller source is not included in the caller ID group (step S54: NO), the connection destination determination unit 17 executes step S61.

  In step S54, when it is determined that the caller ID of the caller terminal device 11 is included in the caller ID group (step S54: YES), it is determined whether the current date and time is included in the date group (step S55). ). That is, first, the connection destination determination unit 17 specifies a condition for the date / time group depending on whether or not the date / time group number is set in the record of the connection condition DB (see FIG. 2) specified by the contractor number as a key. Judge whether there is. When the date group number is set, the connection destination determination unit 17 accesses the date group management DB (see FIG. 2) using the contractor number and date group number as keys. Then, it is determined whether or not the current date / time is included in the date / time group indicated by the date / day of week / holiday, start time and end time information in the record specified by the contractor number and the date / time group number. To do. Note that the holiday management DB is referred to as to whether or not the current date is a holiday. When it is determined that the current date / time is not included in the date / time group (step S55: NO), step S61 is executed.

  If it is determined in step S55 that the current date and time are included in the date and time group (step S55: YES), the connection destination management DB (see FIG. 2) is accessed using the contractor number and the number of tracking as keys, Get the connection destination. If there is no corresponding record (step S56: NO), the process of step S61 is executed. On the other hand, if there is a corresponding record (step S56: YES), the SIP control unit 16 instructs the SIP server 13 to connect to the connection destination indicated by the corresponding record by a SIP signal (step S57). . When connection to the connection destination terminal device 12 is successful, that is, when a notification that the connection destination has responded is received from the SIP server 13 or the terminal device 12 (step S58: YES), the connection destination terminal device 12 is directly received. Connect (step S62). If the connection destination cannot be connected (step S58: NO), the number of chasing is incremented by 1 (step S59), and the processing from step S56 is repeated.

<Fifth embodiment>
In the fifth embodiment, the operation of the communication system when performing voice control will be described.
In FIG. 1, after connecting the terminal device 11 to the MS 19, the user performs a PB operation on the terminal device 11. After receiving the PB signal from the terminal device 11, the MS 19 sends the received PB signal to the high function server 14 on the SIP INFO signal. Thereby, the SIP signal can be controlled by the PB signal. Further, the high function server 14 notifies the MS 19 of the session connection result with the terminal device 11 by an INFO signal. This enables voice control.

FIG. 7 is a diagram showing an operation flow of the communication system according to the fifth embodiment.
In the figure, a SIP session is connected from the terminal device 11 to the MS 19 via SIP via the SIP server 13 and the high function server 14, and a media session for directly transmitting and receiving media signals between the terminal device 11 and the MS 19 is connected. (Step S71). Specifically, the terminal device 11 transmits an INVITE signal, which is a SIP session activation signal, to the SIP server 13. This INVITE signal is transmitted to the MS 19 via the SIP server 13 and the high function server 14. At this time, the SIP server 13 returns 100 Trying as soon as it receives the INVITE signal from the terminal device 11, and the high function server 14 returns 100 Trying as soon as it receives the INVITE signal from the SIP server 13. After receiving the INVITE signal and returning 100 Trying, the MS 19 transmits 200 OK via the high function server 14 and the SIP server 13 when responding. The terminal device 11 returns an ACK to the MS 19 via the SIP server 13 and the high function server 14. Further, media communication is established between the terminal device 11 and the MS 19.

  The terminal device 11 inputs a PB signal to the MS 19 using established media communication, thereby instructing a call from the high function server 14 (step S72). The MS 19 that has received the PB signal from the terminal device 11 sets the content of the received PB signal to a SIP INFO signal (see FIG. 8 for details) and transmits it to the high function server 14 (step S73). The SIP control unit 16 of the high function server 14 returns 200 OK as a response to the INFO signal.

  The high function server 14 that has received the PB signal by the INFO signal calls the connection destination having the number indicated by the PB signal (step S74). That is, the SIP control unit 16 of the high function server 14 transmits an INVITE signal to the connection destination terminal device 12 via the SIP server 13. The terminal device 12 transmits a SIP signal as a response to the INVITE signal to the high function server 14 via the SIP server 13. The high function server 14 notifies the MS 19 of the call result indicated by the SIP signal received from the SIP server 13 by the INFO signal (step S75). In response to the INFO signal, the MS 19 returns 200 OK. The MS 19 controls the voice information based on the call result indicated by the INFO signal received from the high function server 14, and transmits a media signal to the terminal device 11 (step S76). That is, the MS 19 selects a tone or guidance to be transmitted according to the call result, and transmits a voice media signal such as the selected tone or guidance directly to the terminal device 11 by media communication.

FIG. 8 is a diagram showing the setting contents of the INFO signal transmitted from the MS 19 to the high function server 14.
In the figure, an INFO signal describes information indicating that it is a SIP INFO signal, a header portion including information such as a signal source and destination address, and a call number, and information of a PB signal received by the MS 19. Parameter part.

According to the above embodiment, the function sharing between the high function server 14 and the SIP server 13 is functionally equivalent without being related to the control / controlled state like the switch and the SCP in the telephone network. I have a relationship. Further, SIP which is a standard protocol is adopted between the SIP server 13 and the high function server 14, and the SIP server 13 does not perform protocol conversion, and the terminal devices 11 and 12, and the high function server 14 and the signal Send and receive.
In addition, a UA operation is performed in the high-function server 14, and a method for holding a session or a method for not holding a session can be selected according to service needs.
Further, the high function server 14 has a function of actively providing a service by having a function of autonomously calling a connection destination.
Further, the MS 19 receives a media signal (PB signal or the like) and transmits a control signal to the high function server 14 using the SIP signal, thereby enabling control of the SIP session. Further, transmission of media information can be controlled by transmitting a control signal from the high function server 14 to the MS 19 using SIP.

Therefore, according to the above embodiment, it is possible to flexibly control the SIP session and the media session in the communication system using SIP. For example, the high function server 14 can connect terminal devices without holding a session according to the necessity of service, and can reduce the load of managing session information in the high function server 14. In addition, since the high function server 14 mediates a session between terminal devices, the high function server 14 can grasp a call state and collect a call log.
Further, since protocol conversion is not performed in the SIP server 13, the development cost can be reduced, and the possibility of double investment is reduced as compared with the case where a unique protocol is adopted. In addition, since the SIP server 13 and the high-function server 14 are connected using the standardized protocol SIP, not only a specific product but also other general-purpose products that support SIP can be interconnected. A variety of services can be provided.
Further, the SIP session can be controlled by operating a media signal (PB signal or the like) from the terminal device 11. Further, it is possible to control the transmission of media information according to the call state according to the connection result of the SIP session.

  The terminal devices 11 and 12, the SIP server 13, the high-function server 14, and the MS 19 have a computer system inside. The operation processes of the terminal devices 11 and 12, the SIP server 13, the high-function server 14, and the MS 19 are stored in a computer-readable recording medium in the form of a program. The above processing is performed by reading and executing. The computer system here includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

1 is a diagram showing an overall configuration of a communication system according to an embodiment of the present invention. It is a figure which shows the structural example of connection destination determination DB shown in FIG. It is a figure which shows the operation | movement flow of the highly functional server by 1st embodiment. It is a figure which shows the operation | movement flow of the highly functional server by 2nd embodiment. It is a figure which shows the operation | movement flow of the highly functional server by 3rd embodiment. It is a figure which shows the operation | movement flow of the highly functional server by 4th embodiment. It is a figure which shows the operation | movement flow of the communication system by 5th embodiment. It is a figure which shows the example of a setting of the INFO signal by 5th embodiment.

Explanation of symbols

11, 12 ... Terminal device 13 ... SIP server (communication control device)
14 ... High-function server (connection instruction device)
16 ... SIP control unit (reception means, transmission means)
17: Connection destination determination unit (connection destination determination means)
18 ... Connection destination determination DB
19 ... MS (media device)

Claims (12)

A session control method used in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection,
The source terminal device
A SIP signal requesting the start of a session is transmitted to the communication control device;
The communication control device is
Receiving a SIP signal requesting the start of a session from the terminal device of the transmission source, and transmitting the received SIP signal to the connection instruction device;
The connection instruction device is
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Hold the session,
Determine the connection destination based on the information of the call request destination included in the received SIP signal,
When a SIP signal instructing connection to the determined terminal device of the connection destination is returned to the communication control device, a session with the terminal device of the transmission source is released,
The communication control device is
Receiving a SIP signal instructing connection from the communication control device to a terminal device to be connected;
Send a SIP signal requesting the start of a session to the terminal device of the connection destination instructed by the received SIP signal,
The terminal device of the connection destination is
Receiving a SIP signal requesting the start of a session from the connection instruction device;
Establish a session with the originating terminal device,
The session control method characterized by the above-mentioned.
A session control method used in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection,
The source terminal device
A SIP signal requesting the start of a session is transmitted to the communication control device;
The communication control device is
Receiving a SIP signal requesting the start of a session from the terminal device of the transmission source, and transmitting the received SIP signal to the connection instruction device;
The connection instruction device is
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Hold the session,
Determine the connection destination based on the information of the call request destination included in the received SIP signal,
Via the communication control device, send a SIP signal requesting the start of a session with the determined connection destination terminal device, to connect the session with the connection destination terminal device,
A SIP signal instructing connection of a session between the transmission source and the connection destination terminal device to the communication control device;
The terminal device of the connection destination is
Via the communication control device, receiving a SIP signal instructing connection of the session between the source device and the connection destination terminal device, and connecting the session based on the SIP signal;
A SIP signal indicating that a session connection between the transmission source and the connection destination terminal device has been performed is transmitted to the communication control device;
The connection instruction device is
Upon receiving a SIP signal indicating that a session connection between the transmission source and the connection destination terminal device has been performed via the communication control device, the session with the transmission source terminal device and the connection destination Release a session with other terminal devices,
The session control method characterized by the above-mentioned.
A session control method used in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection,
The source terminal device
A SIP signal requesting the start of a session is transmitted to the communication control device;
The communication control device is
Receiving a SIP signal requesting the start of a session from the terminal device of the transmission source, and transmitting the received SIP signal to the connection instruction device;
The connection instruction device is
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Hold the session,
Determine the connection destination based on the information of the call request destination included in the received SIP signal,
Via the communication control device, a SIP signal requesting the start of a session with the source terminal device is transmitted to the determined connection destination terminal device to connect the session with the connection destination terminal device. ,
Connecting a session connected with the terminal device of the connection destination and a session held with the terminal device of the transmission source;
The session control method characterized by the above-mentioned.
A session control method used in a communication system including a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection,
The source terminal device
A SIP signal requesting the start of a session is transmitted to the communication control device;
The communication control device is
Receiving a SIP signal requesting the start of a session from the terminal device of the transmission source, and transmitting the received SIP signal to the connection instruction device;
The connection instruction device is
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Hold the session,
Determine the connection destination based on the information of the call request destination included in the received SIP signal,
A SIP signal requesting the start of a session with the source terminal device is transmitted to the determined connection destination terminal device without passing through the communication control device, and the session with the connection destination terminal device is connected. And
Connecting a session connected with the terminal device of the connection destination and a session held with the terminal device of the transmission source;
The session control method characterized by the above-mentioned.
The communication control device includes:
After a SIP signal requesting the start of a session is transmitted to the connection destination terminal device, a session between the terminal devices is not established when a session between the transmission source and the connection destination terminal device is not established. A SIP signal to notify that is sent to the connection instruction device,
The connection instruction device includes:
Receiving a SIP signal notifying that a session between terminal devices has not been established, determining another connection destination,
A SIP signal instructing connection to the determined other terminal device of the connection destination is returned to the communication control device;
The session control method according to claim 1, wherein:
The communication system further comprises a media device for processing media information,
The connection instruction device includes:
Receiving a SIP signal requesting the start of a session from the communication control device, and transmitting the received SIP signal to the media device;
The media device is:
Receiving a SIP signal requesting the start of a session from the connection instruction device, connecting a session with the terminal device of the transmission source;
Receiving a media signal from the originating terminal device;
Information of the received media signal is notified to the connection instruction device by a SIP signal,
The connection instruction device is
A SIP signal for requesting the start of a session is transmitted to the connection destination terminal device indicated by the media signal information indicated by the SIP signal received from the media device, and the session with the connection destination terminal device is connected;
The session control method according to claim 3 or claim 4, wherein
The connection instruction device includes:
Notifying the media device of the establishment result of the session with the connection destination terminal by a SIP signal;
The media device transmits media information corresponding to a session establishment result indicated by the SIP signal received from the connection instruction device to the terminal device;
The session control method according to claim 6.
The connection instructing device stores subscriber information and connection destination information corresponding to a caller and / or date and time in association with each other,
Subscriber information indicated by information on a call request destination included in the SIP signal requesting the start of a session, information on a call source included in the SIP signal, information on a date and time when the SIP signal was received, or Determine the connection destination based on both
The session control method according to claim 1, wherein:
A communication system comprising a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection,
The communication control device includes:
A SIP signal that receives a SIP signal requesting the start of a session from a source terminal device, transmits the received SIP signal to the connection instruction device, and instructs a connection from the connection instruction device to a connection destination terminal device Communication control means for receiving and transmitting a SIP signal for requesting the start of a session to the terminal device of the connection destination indicated by the received SIP signal;
The connection instruction device includes:
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Receiving means for holding the session;
A connection destination determination unit that determines a connection destination based on information of a call request destination included in the SIP signal received by the reception unit;
When the SIP signal instructing connection to the connection destination terminal device determined by the connection destination determination means is returned to the communication control device, a session with the source terminal device is released, or
Or
A session with the connection destination terminal device determined by the connection destination determination means is connected, and a SIP signal instructing connection of the session between the transmission source device and the connection destination terminal device is transmitted to the communication control device. When receiving a SIP signal indicating that a session connection between the transmission source and the connection destination terminal device has been performed via the communication control device, the session with the transmission source terminal device and the A connection selection means for selecting whether to release a session with a connection destination terminal device according to a service to which the connection destination terminal device subscribes;
A communication system characterized by the above.
A communication system comprising a terminal device that transmits and receives a SIP signal, a communication control device that transfers a SIP signal, and a connection instruction device that determines a connection destination and instructs a connection,
The communication control device includes:
A SIP signal that receives a SIP signal requesting the start of a session from a source terminal device, transmits the received SIP signal to the connection instruction device, and instructs a connection from the connection instruction device to a connection destination terminal device Communication control means for receiving and transmitting a SIP signal for requesting the start of a session to the terminal device of the connection destination indicated by the received SIP signal;
The connection instruction device includes:
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Receiving means for holding the session;
A connection destination determination unit that determines a connection destination based on information of a call request destination included in the SIP signal received by the reception unit;
Instructing connection of a session between the source terminal and the terminal device of the connection destination to release the held session,
Or
Connecting a session with the connection-destination terminal device and connecting a session connected with the connection-destination terminal device and a session held with the terminal device of the transmission source, or Connection selection means for selecting according to the service to which the terminal device of the connection destination subscribes,
A communication system characterized by the above.
A connection instruction device in a communication system comprising: a terminal device that transmits and receives a SIP signal; a communication control device that transfers a SIP signal; and a connection instruction device that determines a connection destination and instructs a connection;
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Receiving means for holding the session;
A connection destination determination unit that determines a connection destination based on information of a call request destination included in the SIP signal received by the reception unit;
When the SIP signal instructing connection to the connection destination terminal device determined by the connection destination determination means is returned to the communication control device, a session with the source terminal device is released, or
Or
A session with the connection destination terminal device determined by the connection destination determination means is connected, and a SIP signal instructing connection of the session between the transmission source device and the connection destination terminal device is transmitted to the communication control device. When receiving a SIP signal indicating that a session connection between the transmission source and the connection destination terminal device has been performed via the communication control device, the session with the transmission source terminal device and the A connection selection means for selecting whether to release a session with a connection destination terminal device according to a service subscribed to by the connection destination terminal device;
A connection instructing device comprising:
A connection instruction device in a communication system comprising: a terminal device that transmits and receives a SIP signal; a communication control device that transfers a SIP signal; and a connection instruction device that determines a connection destination and instructs a connection;
When a SIP signal requesting the start of a session is received from the communication control device, session information relating to the session with the caller terminal device is held in accordance with the call destination subscription service information held in advance. Receiving means for holding the session;
A connection destination determination unit that determines a connection destination based on information of a call request destination included in the SIP signal received by the reception unit;
Instructing connection of a session between the source terminal and the terminal device of the connection destination to release the held session,
Or
Connecting a session with the terminal device of the connection destination and connecting a session connected with the terminal device of the connection destination and a session held between the terminal device of the transmission source, or A connection selection means for selecting according to the service to which the terminal device of the connection destination subscribes;
A connection instructing device comprising:

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