JP2008135873A - Terminal switching system, terminal switching method, and terminal switching program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To switch a regular switching terminal to a switching-destination terminal without making a switching-source terminal directly indicate a switching destination while maintaining services which are being provided. <P>SOLUTION: A terminal switching system according to the present invention switches a communication terminal in communication among a plurality of communication terminals that specified users use to another communication terminal. The terminal switching system includes a terminal managing means of previously managing a plurality of communication terminals to be switched by the specified users; a switching control means of authenticating the adequacy of a switching-source terminal based upon dialog information and sending a transfer request to a switching-destination terminal retrieved from the terminal managing means when receiving switching intention notice including at least dialog information related to communication from the switching-source terminal in the communication; and a switching performance means of establishing a session with the communication terminal as a communication target and performs transfer processing for the switching-destination terminal on receiving the transfer request from the switching control means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a terminal switching system, a terminal switching method, and a terminal switching program, and can be applied to, for example, a system or method for switching user terminals while maintaining service provision in a network.

  The next generation network (NGN) is expected to provide various services. One of these services is a seamless service that combines a fixed communication network and a mobile communication network, that is, FMC. (Fixed Mobile Convergence) service.

  In order to realize the FMC service, there is a need for a method of switching a communication session from a communicating user terminal to another user terminal while maintaining a currently provided service. Conventionally, regarding this type of technology, for example, there are technologies described in Patent Documents 1 and 2 and the like.

  Patent Document 1 includes a service switching server, and when a session is switched, a destination terminal sets a destination terminal as a handover destination and is shared between the source terminal and the service switching server. Give the key to the destination terminal. Then, a technique is described in which when the service switching server makes an authentication request to the handover destination destination terminal, the destination terminal uses the recalculation result of this common key to cause the service switching server to perform an authentication process.

  In Patent Document 2, in order to realize a ubiquitous communication network, a user terminal is not limited to the location of a plurality of high-speed access infrastructures, and the service interoperability is not changed without changing the specifications of the user terminal. Assured system technology is described.

JP-A-2005-122651 JP 2003-70043 A IETF RFC3515 The Session Initiation Protocol (SIP) Refer Method

  However, when the system is actually operated and the service is provided using the techniques described in Patent Documents 1 and 2 described above, there are the following problems.

(1) Session switching destination instruction In the conventional system, the session switching destination instruction is performed by the transfer source terminal. For example, in Patent Document 1, although authentication technology is linked, the transfer source terminal instructs the switching destination. In this case, a malicious third party impersonates the transfer source terminal and may instruct the switching destination, which is a problem from the viewpoint of security.

(2) Authentication procedure at the time of switching Next, authentication processing for the switching destination terminal at the time of switching the session becomes a problem. For example, in the conventional system described in Patent Document 1, authentication information is directly notified between a transfer source terminal and a switching destination terminal as a countermeasure against impersonation by a third party. However, it is assumed that the exchange of authentication information between terminals is a local procedure, and communication of terminals is realized using, for example, infrared communication. For this reason, both terminals need to be compatible with this authentication method, and the feasibility is limited. In addition, the detailed implementation method of this procedure is not clear, and it is necessary to implement a unique authentication method on the terminal side.

  Therefore, a terminal switching system, a terminal switching method, and a terminal switching program capable of switching from a regular switching terminal to a switching destination terminal without instructing a switching destination directly from the switching source terminal while maintaining the provided service Is required.

  In order to solve such a problem, a terminal switching system according to a first aspect of the present invention is a terminal switching system that switches a communication terminal that is communicating to another communication terminal among a plurality of communication terminals used by a specific user. (2) a terminal management means for managing a plurality of communication terminals to be switched in advance for each specific user; and (2) a dialog when receiving a switching intention notification including at least dialog information related to the communication from the switching source terminal during communication. (3) Establishing a session between the switching control means for authenticating the validity of the switching source terminal based on the information and making a transfer request to the switching destination terminal searched from the terminal management means, and (3) the communication terminal to be communicated And a switching execution unit that receives a transfer request from the switching control unit and performs a transfer process of the switching destination terminal.

  The terminal switching method according to the second aspect of the present invention is the terminal switching method for switching a communication terminal that is in communication to another communication terminal among a plurality of communication terminals used by a specific user. A terminal management process for managing a plurality of target communication terminals for each specific user, and (2) dialog information when receiving a switching intention notification including at least dialog information related to the communication from a switching source terminal during communication. A switch control step of authenticating the validity of the switching source terminal based on the request and requesting transfer to the switching destination terminal searched from the terminal management means, and (3) establishing a session between the communication terminals to be communicated A terminal switching method comprising: a switching execution step of receiving a transfer request from a switching control means and performing a transfer process of the switching destination terminal.

  A terminal switching program according to a third aspect of the present invention is a terminal switching program for switching a communicating communication terminal to another communication terminal among a plurality of communication terminals used by a specific user. Terminal management means for managing a plurality of communication terminals for each specific user; (2) a switching source terminal based on dialog information when receiving a switching intention notification including at least dialog information related to the communication from the switching source terminal during communication Switching control means for authenticating the legitimacy and making a transfer request to the switching destination terminal retrieved from the terminal management means, and (3) establishing a session with the communication terminal to be communicated, A terminal switching program that receives a transfer request from a control unit and functions as a switching execution unit that performs a transfer process of a switching destination terminal.

  According to the present invention, it is possible to switch from a regular switching terminal to a switching destination terminal without instructing the switching destination directly from the switching source terminal while maintaining the provided service.

(A) First Embodiment Hereinafter, a first embodiment of a user terminal switching system, a user terminal switching method, and a user terminal switching program according to the present invention will be described with reference to the drawings.

  In an integrated network in which a fixed communication network and a mobile communication network are integrated, the first embodiment maintains a service provided between communicating user terminals, while changing from one user terminal to another different user terminal. An embodiment in which the user terminal switching system, the user terminal switching method, and the user terminal switching program of the present invention are applied to a system that implements a terminal switching process (terminal switching service) for switching a communication session will be described.

  In the first embodiment, a case where SIP (Session Initiation Protocol) is adopted as a control protocol for establishing a session between user terminals will be described as an example.

(A-1) Configuration of First Embodiment (A-1-1) Overall Configuration FIG. 1 is a configuration diagram showing a network configuration of the first embodiment. In FIG. 1, a network 10 according to the first embodiment includes an IP network 1, a call control server 2, a presence server 3, an application server 4, user terminals A, B, and C (shown as terminals A, B, and C in the figure). , At least.

  The IP network 1 is a network that realizes packet transfer, for example, a network that employs the Internet protocol (IP) as a communication protocol. The IP network 1 can be a wired network constituted by digital lines, optical lines, etc., a wireless network such as a wireless LAN access network and a mobile communication network, or a network obtained by combining these.

  The call control server 2 manages the location information of the user terminals A to C and performs basic call control (signal routing operation) of the user terminals A to C. For example, a SIP Proxy server or the like is applicable.

  The presence server 3 manages presence information indicating the status / situation of the user terminals A to C and notifies a predetermined terminal (watcher) constituting the network in real time. Here, as the presence information, for example, for each of the user terminals A to C, there is information indicating a state such as during a call, absence (offline), call available (online), presence, going out, and in a meeting.

  The application server 4 has an application for controlling the switching operation of the user terminal. The application server 4 executes, for example, management of call establishment to user terminal switching control (for example, authentication processing, session switching instruction, etc.). Details of functions executed by the application server 4 will be described later.

  The user terminals A to C are SIP-compatible telephone terminals (so-called SIP terminals) operated by the user. For example, SIP-compatible IP telephone terminals (concepts including fixed type, moving form type, etc.), SIP-compatible softphones A personal computer having a function (a concept including a desktop type, a node type, a portable type, etc.), a terminal having a voice communication function compatible with SIP, and the like are applicable.

  The user terminal A is a terminal used by the user 5 and has a telephone number (or identification information) “AAAA”. The user terminals B and C are terminals used by the user 6, and the telephone numbers (or identification information) are “BBBB” and “CCCC”, respectively.

  In the network 10, when a terminal switching service contract is concluded, the user terminal needs to perform registration setting of a terminal to be switched by a predetermined registration process (RESISTER).

  In the first embodiment, since the existing technology can be applied to the registration process, a detailed description thereof will be omitted. However, the user terminal performs registration setting for at least the call control server 2 and the application server 4 by a predetermined registration process, Further, it is assumed that at least the call control server 2 and the application server 4 manage user terminals to be switched for each user. That is, it is assumed that the call control server 2 and the application server 4 have user terminals B and C registered as user terminals to be switched in a contract with the user 6.

  Further, in the first embodiment, it is assumed that when a user terminal tries to receive a service, authentication processing at the network level (that is, cooperation with a server) is performed.

(A-1-2) Detailed Configuration of Call Control Server FIG. 2 is a block diagram showing the internal configuration of the call control server 2. In FIG. 2, the call control server 2 includes at least a routing information processing unit 21, a SIP signal processing unit 22, a routing information management unit 23, and a user information management unit 24.

  The routing information processing unit 21 controls a routing process of signals transmitted to and received from a user terminal that establishes a call while referring to the routing information management unit 23.

  The SIP signal processing unit 22 controls the transmission / reception processing of the SIP signal under the control of the routing information processing unit 21. Thereby, connection processing is performed using the SIP among the user terminals A to C, the presence server 3 and the application server 4. Further, the SIP signal processing unit 22 refers to the user information management unit 24 and transfers the received signal to the application server 4 when the received signal is an outgoing signal or an incoming signal related to the user terminal to be switched. . Thus, the terminal switching process can be performed in cooperation with the application server 4 by forwarding the outgoing signal or the incoming signal related to the user terminal of the contract user of the terminal switching service to the application server 4.

  The routing information management unit 23 manages routing information, and the user information management unit 24 manages user terminal information such as subscriber information and user terminal position information.

  Here, FIG. 5 is a diagram illustrating an example of a management table managed by the user information management unit 24. In FIG. 5, the management table 50 manages “user name 51” and “transfer service telephone number (or transfer service user ID) 52” in association with each other. The “user name 51” is a user name that makes a contract for the user terminal switching service described in the first embodiment, and the “transfer service telephone number 52” is a user terminal to be switched that is registered and set by the contract user. Phone number. Note that as long as the user terminal to be switched can be specified, it is not limited to the telephone number of the user terminal, but may be identification information (ID (for example, IP address)) of the user terminal.

  FIG. 6 is a diagram illustrating another example of a management table managed by the user information management unit 24. In FIG. 6, “user name 61” and “forwarding service telephone number 62” are managed in association with each other, but the configuration of “forwarding service telephone number 62” differs from the management table 50 of FIG. That is, the “transfer service telephone number 62” in FIG. 6 collectively manages the telephone numbers of one or a plurality of user terminals to be switched using a single identification information (Group-ID (group ID)). Show the case. As an example of this Group-ID, identification information assigned to a user when FMC is adopted can be applied. Thereby, the user who concerns on a terminal switching process can be managed with single identification information.

(A-1-3) Detailed Configuration of Presence Server FIG. 3 is a block diagram showing the internal configuration of the presence server 3. 3, the presence server 3 includes at least a presence information processing unit 31, a SIP signal processing unit 32, a presence information management unit 33, and a user information management unit 34.

  The presence information processing unit 31 acquires presence information of each of the user terminals A to C in real time, and notifies the acquired presence information of the presentity terminal to a predetermined watcher terminal.

  In the first embodiment, the presence information processing unit 31 is connected to another user terminal (a user who is registered and set) when one user terminal with a terminal switching service contract is in communication. Terminal) that one user terminal is communicating. Thereby, it can be made to recognize that there exists a possibility of a terminal switching instruction with respect to another user terminal.

  The SIP signal processing unit 32 controls the transmission / reception processing of the SIP signal with each of the user terminals A to C and the call control server 2 while referring to the user information management unit 34. Thereby, the presence server 3 employs SIP to perform connection processing with each of the user terminals A to C and the call control server 2.

  The presence information management unit 33 manages presence information of each user terminal A to C, and the user information management unit 34 manages user terminal information such as subscriber information and position information of each user terminal A to C. To do.

(A-1-4) Detailed Configuration of Application Server FIG. 4 is a block diagram showing an internal configuration of the application server 4. 4, the application server 4 includes at least a switching APL unit 41, a SIP signal processing unit 42, and a user information management unit 43.

  The switching APL unit 41 executes an application that operates the terminal switching process.

  FIG. 7 is a functional block diagram showing processing functions executed by the switching APL unit 41. In FIG. 7, the switching APL unit 41 functions as an authentication processing function unit 412, a session establishment reservation processing function unit 413, a terminal switching execution processing function unit 414, and a disconnection processing function unit 415.

  When the authentication processing function unit 412 receives a session switching instruction from a specific user terminal (a user terminal registered and set) that subscribes to the terminal switching service, the authentication processing function unit 412 performs an authentication process on the specific user terminal that is the transmission source of the session switching instruction. Is. Thereby, it can be confirmed whether it is the terminal switching instruction | indication from a regular contract user. In the first embodiment, it is assumed that the user terminal issues a session switching instruction from the user terminal to the application server 4 using HTTP.

  Here, the authentication processing function unit 412 authenticates the transmission source specific user terminal by normal HTTP authentication and refers to the user information management unit 43 to receive the specific user terminal received from the transmission source specific user terminal. Authentication is performed by collating user terminal information, etc., and checking whether dialog information during communication is included.

  By performing such authentication processing, the specific user terminal can be prevented from issuing a terminal switching instruction using identification information such as a telephone number of the switching destination terminal. In other words, by not instructing the switching destination, it is possible to prevent impersonation by a malicious third party, and thus security can be improved.

  When the authentication result by the authentication processing function unit 412 is OK, the session establishment reservation processing function unit 413 searches the user information management unit 43 for the switching destination terminal of the user, and establishes a connection with the switching destination terminal. A session establishment reservation is made.

  Thus, by making a session establishment reservation, it is possible to establish a session with the switching destination terminal in advance, so that a failure or the like during switching can be avoided. For example, although it is a rare timing, there is a possibility of switching failure when an incoming call is received from another terminal to the switching destination terminal during switching. Therefore, this can be avoided by establishing the session in advance.

  After the session establishment reservation processing function unit 413 establishes the session of the switching destination terminal, the terminal switching execution processing function unit 414 refers to the resource of the call being communicated based on the dialog information from the terminal switching instruction transmission source terminal, and performs communication A session is established between the other user terminal (partner terminal) and the switching destination terminal, and the terminal switching process is executed.

  The disconnection processing function unit 415 opens a session between the switching source terminal and another user terminal (partner terminal) in communication after the terminal switching execution processing function unit 414 executes the terminal switching process. .

  Returning to FIG. 4, the SIP signal processing unit 42 performs SIP signal transmission / reception processing with reference to the user information management unit 43. That is, when the SIP signal processing unit 42 receives the SIP signal from the call control server 2, the SIP signal processing unit 42 analyzes the signal content such as the call destination and the contract information and the like while referring to the user information management unit 43, and the user terminal of the specific user When a call is made and received, call processing is exchanged with the call control server 2 in order to establish a call for the specific user terminal. Thereby, the application server 4 performs connection processing with the call control server 2 using SIP.

  The user information management unit 43 is necessary for contract information (for example, user information, identification information such as a telephone number of the user terminal), switching data, and authentication data (for example, HTTP authentication) for a specific user who makes a contract for the terminal switching service. Management information etc.). As the contract information of the specific user managed by the user information management unit 43, the information exemplified in FIGS. 5 and 6 can be applied.

(A-1-5) Detailed Configuration of User Terminal FIG. 8 is a block diagram showing an internal configuration of user terminals B and C (shown as user terminal 8) possessed by a user who has contracted for a terminal switching service.

  8, the user terminal 8 includes a voice communication processing unit 81, a SIP signal processing unit 82, a presence function unit 83, a terminal switching valid / invalid setting unit 84, and a terminal switching instruction unit 85.

  The voice communication processing unit 81 realizes voice communication. The SIP signal processing unit 82 transmits and receives SIP signals. Thereby, connection processing between the call control server 2 and the presence server 3 is performed using SIP.

  The presence function unit 83 receives presence information of the presentity terminal from the presence server 3, and recognizes in real time the status of other user terminals to be switched that are registered and set by the contract user. Note that it is assumed that all of the plurality of user terminals of the contract user have a relationship between the watcher and the presentity.

  The terminal switching valid / invalid setting unit 84 validates or invalidates the terminal switching instruction by the terminal switching instruction unit 85 according to the presence information of other user terminals received by the presence function unit 83. . That is, the terminal switching valid / invalid setting unit 84 invalidates terminal switching when other user terminals are communicating, and sets terminal switching as valid when other user terminals are online and idle. To do.

  The terminal switching instruction unit 85 transmits a terminal switching instruction to the application server 4 at the user terminal in communication. At this time, the terminal switching instruction unit 85 includes user information, authentication information (normal authentication information in HTTP), dialog information during communication, and the like in the terminal switching instruction, and performs this to the application server 4 using HTTP.

  The user terminal 8 may include an operation button for instructing terminal switching, for example, although the appearance thereof is not illustrated.

(A-2) Operation of First Embodiment Next, the operation of terminal switching processing in the network 10 of the first embodiment will be described with reference to the drawings.

(A-2-1) Operation of Terminal Switching Process In the following, when establishing a session between user terminal A and user terminal B, user 6 changes from user terminal B in communication to user. An operation when switching a session to the terminal C will be described as an example.

  9 to 11 are sequence diagrams showing the operation of the terminal switching process for switching the session from the user terminal B during communication to the user terminal C.

  First, an operation for establishing a session between the user terminal A and the user terminal B when the user terminal A (transmitting terminal) makes a call to the user terminal B (receiving terminal) will be described with reference to FIG.

  Note that it is assumed that registration processing of user terminals to be switched by contracted users of the terminal switching service is performed in advance, and the states of user terminals B and C at this time are both online and free. .

  In FIG. 9, in order to establish a call with the user terminal B, the user terminal A, which is the calling terminal, transmits an INVITE message with the user terminal B as the destination to the call control server 2, and the call control server 2 SIP signals are exchanged with each other (F1 to F5).

  When the SIP signal from the user terminal A is given to the call control server 2, the call control server 2 analyzes the destination and destination of the SIP signal by the SIP signal processing unit 22 (S1).

  At this time, the SIP signal processing unit 22 analyzes, based on the received SIP signal, whether or not the destination is a user terminal in which a contract user is registered, with reference to the user information management unit 24. . Then, when the call destination is a registered user terminal, the SIP signal processing unit 22 transfers the received SIP signal to the application server 4 under the function of the routing information processing unit 21. If the call destination is not a registered user terminal, normal SIP call processing is performed.

  When the SIP signal from the call control server 2 is given to the application server 4, the SIP signal is confirmed in the application server 4 by the SIP signal processing unit 42 such as the signal content such as the call destination and the contract information. If it is assumed that the call destination is the call destination, the SIP signal processing unit 42 sets the INVITE with the call destination as the user terminal B to the call control server 2 in order to establish a call with the user terminal B as the call destination. And exchanges SIP signals with the call control server 2 (F6 to F9).

  Further, the call control server 2 receives the SIP signal having the destination as the user terminal B from the application server 4 to exchange the SIP signal with the user terminal B (F10 to F16). In response to the off-hook, a call (first call and second call) between the user terminal A and the user terminal B is established (F17 to F23). Thereby, a communication session is established between the user terminal A and the user terminal B, and a call is started (S2).

  As soon as a communication session is established between the user terminal A and the user terminal B, the user terminal B according to the contract for the terminal switching process transmits presence information notifying that the call is “busy” to the presence server 3. (F24, F25).

  When presence information from the user terminal B is given to the presence server 3, the presence server 3 notifies the user terminal C, which is a watcher, (F26, F27). As a result, the user terminal C can recognize that there is a possibility that a switching instruction from the user terminal B is generated since the user terminal B is busy (S3).

  Next, the operation | movement which implement | achieves terminal switching from the user terminal B to the user terminal C is demonstrated, referring FIG.10 and FIG.11.

  In FIG. 10, in response to the user's operation, the user terminal B transmits a session switching instruction signal to the application server 4 using HTTP (S4) (F28).

  At this time, the terminal switching instruction signal transmitted by the user terminal B does not include the user terminal information (for example, information such as a telephone number) of the user terminal C that is the switching destination, but the user terminal information of the user terminal B And authentication information, dialog information related to a call with the user terminal A, and the like.

  When a terminal switching instruction from the user terminal B is given to the application server 4, the switching APL unit 41 of the application server 4 performs an authentication process normally used in HTTP and refers to the user information management unit 43 while referring to the user information management unit 43. Verification of whether user terminal B is a terminal related to a regular contract is performed by checking whether user terminal information etc. of terminal B is included and whether dialog information during a call is included (S5).

  If the authentication result is OK, the switching APL unit 41 searches the user terminal management unit 43 for the switching target user terminal C registered for the contract user, and sets the switching destination as the user terminal information of the user terminal C. As described above, session establishment reservation processing of the user terminal C is performed on the call control server 2 (F29 to F36, S6). Thereby, the established call is set as the third call.

  By performing the session establishment reservation process in this way, the session switching process can be reliably performed. When the authentication result is NG, the session switching instruction is discarded and the switching process is not performed.

  Here, when the user terminal C receives the SIP signal which is a call request from the call control server 2 (F31), the user terminal C distinguishes between the normal incoming call and the incoming call and performs an automatic response process for the incoming call related to the terminal switching (S7). ). FIG. 12 is a flowchart showing an operation example of automatic response processing in the user terminal C in this case.

  In FIG. 12, when an INVITE message is given from the call control server 2 (F71), the content of the INVITE message is confirmed, and the user terminal (that is, the user terminal for which registration setting related to the contract is made: in this case, the user terminal B It is confirmed whether or not it is INVITE from (F72).

  If it is INVITE from the own user terminal, the state of the own user terminal is confirmed (F73). If the own user terminal is in a call, it is recognized as a resource reservation and a 200 response message is sent to the call control server 2. Reply (F74).

  In addition, when it is not INVITE from the own user terminal or when the own user terminal is not in a call, a normal incoming call operation is performed (F75, F76).

  Normally, off-hook by the user is necessary, but by performing the above operation, the user terminal C can distinguish between normal incoming call and incoming call related to terminal switching, and automatically Session establishment processing can be achieved.

  Returning to FIG. 10, when the session of the switching-destination user terminal C is established, the switching APL unit 41 of the application server 4 uses the first call dialog information received from the user terminal B and uses the REFER-based user terminal C (the first terminal). 3), the user terminal A makes a transfer request to the user terminal C (referred to as the fourth call) to the call control server 2 (F45 to F50).

  Also in this case, the call control server 2 gives the SIP signal of the transfer request to the user terminal C to the application server 4 because the SIP signal of the transfer request is an SIP signal that receives the user terminal C related to the contract (F51). F52).

  In FIG. 11, when a transfer request from the call control server 2 to the user terminal C (third call) is given to the application server 4, the switching APL unit 41 requests the call control server 2 to transfer to the user terminal C. When the transfer process to the user terminal C is completed (F61 to F64), a call between the user terminal A and the user terminal C is started (S8).

  As soon as a communication session is established between the user terminal A and the user terminal C, the user terminal C according to the contract for the terminal switching process transmits presence information notifying that the call is “busy” to the presence server 3. (F65, F66).

  When presence information from the user terminal C is given to the presence server 3, the presence server 3 notifies the user terminal B, which is a watcher, (F67, F68). Thereby, the user terminal B can recognize that the user terminal C is busy.

  In addition, after establishing a communication session between the user terminal A and the user terminal C, the user terminal A transmits a notification message for releasing the session between the user terminal A and the user terminal B to the call control server 2 ( F69). Note that the timing at which the user terminal A transmits the notification message can be flexibly set according to the system operation or the like.

  When a notification message is given to the application server 4 via the call control server 2 (F70 to F73), the switching APL unit 41 of the application server 4 transmits a disconnect message to the user terminal A through the call control server 2, The user terminal A performs the first call disconnection process (F73 to F76), and transmits a disconnect message to the user terminal B through the call control server 2 to perform the user terminal B disconnection process (F77 to F76). F80).

  At this time, the user terminal B involved in the contract for the terminal switching process transmits presence information notifying that the “free state” has been reached to the presence server 3 (F81, F82), and the presence server 3 is a user terminal that is a watcher. This is notified to C (F83, F84). As a result, the user terminal B recognizes that the user terminal C is “in communication”, and thus recognizes that a switching instruction may be generated from the user terminal C.

  Further, the user terminal C transmits a disconnection request to the call control server 2 to disconnect the third call, and disconnects the third call (F85 to F88).

  FIG. 13 is an image diagram of a terminal switching service provided using the terminal switching system according to the first embodiment.

  In the example of FIG. 13, it is assumed that the contract user makes a voice call with the PC fixed terminal A using the mobile terminal B and then switches from the mobile terminal B to the home PC fixed terminal C when returning to the home. To explain.

  The contract data managed by the user information management unit 43 of the application server 4 is managed using the FMC number (that is, the case corresponding to the example of FIG. 6).

  In addition, the telephone number of the PC fixed terminal A is assigned to “0AB to J number”, the telephone number of the user terminal B is “050 to number”, and the telephone number of the PC fixed terminal is “0AB to J number”. The FMC number is “060-number”.

  In FIG. 13, the mobile terminal B establishes a call session with the PC fixed terminal A, and the user 6 makes a call with the user 5 (S21).

  Thereafter, when the user 6 arrives at home, in response to the operation of the user 6, the mobile terminal 6 transmits a terminal switching instruction to the application server 4 by HTTP (S22).

  In response to the terminal switching instruction, the application server 4 activates the switching application (that is, the switching APL unit) 41, and issues a switching request (REFER request) to the PC fixed terminal A via the call control server 2 (S23).

  Then, a switching request from the user terminal A is given to the application server 4 via the call control server 2, and session switching is performed with the destination being the PC fixed terminal C (S24).

  Thereby, it is possible to continuously make a call (for example, a videophone call) between the PC fixed terminal A and the PC fixed terminal C without disconnecting the call (S25). Thereafter, the session with the mobile terminal B is disconnected (S26).

(A-2-2) Operation when terminal switching process is not possible Next, the operation when the switching destination terminal is communicating and the terminal switching process cannot be performed will be described with reference to FIG. FIG. 14 is a sequence diagram illustrating an operation when the terminal switching process cannot be performed.

  In the following, an example will be described in which an incoming call to the user terminal C occurs during communication between the user terminal A and the user terminal B, and a terminal switching process from the user terminal B to the user terminal C cannot be performed. To do.

  In FIG. 14, the processes from F101 to F127 and the processes from S11 to S13 are the same as the processes from F1 to F27 and S1 to S3 in FIG.

  When the user terminal A and the user terminal B are communicating, when the user terminal C becomes busy due to another incoming call to the user terminal C or a call from the user terminal C (S14), the user terminal C The presence server 3 notifies the presence server 3 of presence information (F128, F129), and the presence server 3 notifies the user terminal B as a watcher (F130, F131).

  At this point, the user terminal B recognizes that switching to the user terminal C is not possible, and cannot issue a switching instruction (for example, the switching instruction is invalidated for a button, etc.) (S15). That is, the user terminal recognizes that session switching cannot be performed based on the presence status of the switching target terminal. Therefore, the terminal switching instruction with the user terminal C as the switching destination cannot be performed.

(A-3) Effect of First Embodiment As described above, according to the first embodiment, it is possible to prevent a transfer destination (switching destination) address from being set in a terminal switching instruction from a user terminal, a terminal By sending dialog information during a call, the user terminal that issues a switching instruction can authenticate that the switching source terminal is a legitimate instruction, making it easy to switch from a malicious third party impersonation terminal. Guarding becomes possible, and switching to a preset switching destination can be performed appropriately.

  Further, according to the first embodiment, the user terminal can recognize the effectiveness of switching to the switching destination terminal by interlocking with the presence function. Therefore, an unnecessary switching instruction from the user terminal can be avoided.

  Furthermore, according to the first embodiment, immediately after the terminal switching instruction, a state in which a session with the switching destination terminal is secured in advance can be put into a more switchable state.

(B) Other Embodiments (B-1) In the first embodiment, the call control server, application server, and presence server are physically separated. However, as long as each function described in the first embodiment can be realized, all of the functions may be physically installed in the same server, and each of the call control server, application server, and presence server includes The functional configuration may be distributed as a plurality of servers provided in different combinations.

  In FIG. 1, even when the presence server is not provided, the terminal switching process described in the first embodiment can be realized. Of course, it is effective to provide a presence server from the viewpoint of causing the user terminal to recognize the state of the switching destination and ensuring the reliability of the terminal switching process.

(B-2) The switching instruction from the user terminal is not limited to the one using HTTP as long as it can be performed to the application server. For example, it may be realized by applying a function that can be used by binding to an application server protocol, such as SOAP.

(B-3) The number of registered user terminals registered by the contract user may be three or more. In this case, the designation and selection method of the switching destination can be realized by setting with an operation policy or the like. For example, a procedure for designating a switching destination terminal by an HTTP route at or after the terminal switching designation, or a method of setting the priority of the switching destination terminal in advance can be applied.

(B-4) The order of the processes shown in FIGS. 10 to 12 and 14 is not limited as long as the same effect as the process described in the first embodiment can be obtained. Can be changed accordingly.

  For example, in the first embodiment, the session establishment reservation process of the switching destination terminal is performed after the switching instruction, but the session establishment reservation process is performed using another user terminal as the switching destination terminal when a certain user terminal makes or receives a call. It may be.

  That is, for example, the resource reservation processing of F29 to F36 in FIG. 10 may be performed within the session establishment flow between the user terminal A and the user terminal B (for example, immediately after F23). This makes it possible to reserve session establishment with the switching destination terminal before the switching instruction.

  In this case, even if an incoming call to the switching destination terminal or an outgoing call from the switching destination terminal occurs after the session is established with the switching destination terminal, the switching destination terminal cannot make or receive the call. Therefore, in order to maintain the convenience of the service, the following processing can be applied.

  FIG. 15 is an image diagram showing processing in this case.

  First, in FIG. 15A, the user terminal A and the user terminal B are in a call, and the application server 4 establishes a session with the user terminal C in advance before the switching instruction (S31). This session of the user terminal C is referred to as session 1.

  Thereafter, when there is an incoming call from the third party user terminal D to the user terminal C (S32), the application server 4 releases the session 1 (S33).

  That is, when a SIP signal having the user terminal C as a destination is given from the user terminal D to the application server 4 via the call control server 2, the application server 4 opens the session 1.

  In FIG. 15B, after releasing session 1, the application server 4 makes an incoming call request to the user terminal C and establishes a new session 2 (S34). Thereby, a session is established via the application server 4 (S35), and a call between the user terminal D and the user terminal C is realized (S36).

  After that, in FIG. 15C, when the call between the user terminal D and the user terminal C ends, the application server 4 establishes a session with the user terminal C again (S37). This second session is called session 3.

  As described above, when there is an incoming call to the switching destination terminal or an outgoing call from the switching destination terminal after the session of the switching destination terminal is established, the application server provides the arbitration function as shown in FIG. This can be realized by performing priority processing. Further, according to the processing shown in FIG. 15, since it can be implemented by the application server, it can be easily realized.

(B-5) In the operation section of the first embodiment, the operation when there is an incoming call to the user terminal related to the contract has been described as an example. However, even when the user terminal makes a call, the call control server transfers the SIP signal from the user terminal to the application server, so the process described in the first embodiment is the same.

(B-6) In the operation section of the first embodiment, after switching from the user terminal B to the user terminal C, it is possible to switch back from the user terminal C to the user terminal B again. The operation in this case is the same as that described in the first embodiment.

(B-7) The function realized by the call control server, application server, presence server, and each user terminal is software processing realized by each information processing apparatus (for example, CPU) executing a processing program. . Of course, if possible, it may be realized by hardware processing using an electronic circuit or the like.

It is a block diagram which shows the structure of the network of 1st Embodiment. It is a block diagram which shows the internal structure of the call control server of 1st Embodiment. It is a block diagram which shows the internal structure of the presence server of 1st Embodiment. It is a block diagram which shows the internal structure of the application server of 1st Embodiment. It is explanatory drawing which shows the example of the content of the management data of 1st Embodiment (the 1). It is explanatory drawing which shows the example of the content of the management data of 1st Embodiment (the 2). It is a functional block diagram which shows the function of the switching APL part of 1st Embodiment. It is a functional block diagram which shows the internal structure of the user terminal of 1st Embodiment. It is a sequence diagram which shows operation | movement of the terminal switching process of 1st Embodiment (the 1). It is a sequence diagram which shows operation | movement of the terminal switching process of 1st Embodiment (the 2). It is a sequence diagram which shows operation | movement of the terminal switching process of 1st Embodiment (the 3). It is a flowchart which shows the automatic response process in the switching destination terminal of 1st Embodiment. It is an image figure which shows the example of application of the terminal switching process of 1st Embodiment. It is a sequence diagram which shows operation | movement of the terminal switching process of 1st Embodiment (the 4). It is a sequence diagram which shows the modification of the operation | movement of the terminal switching process of 1st Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Network, 1 ... IP network, 2 ... Call control server (SIP Proxy server), 3 ... Presence server, 4 ... Application server (switching control server), User terminal AC, 24, 34, 43 ... User information management , 41... Switching APL unit, 21, 31, 42... SIP signal processing unit.

Claims (7)

Among a plurality of communication terminals used by a specific user, in a terminal switching system that switches a communicating communication terminal to another communication terminal,
Terminal management means for managing the plurality of communication terminals to be switched in advance for each specific user;
When a switching intention notification including at least dialog information related to the communication is received from the switching source terminal during communication, the switching destination retrieved from the terminal management unit is authenticated and the legitimacy of the switching source terminal based on the dialog information is authenticated. Switching control means for making a transfer request to the terminal;
A session with a communication terminal to be communicated, comprising: a switching execution unit that receives the transfer request from the switching control unit and performs a transfer process of the switching destination terminal; Terminal switching system.   The terminal switching system according to claim 1, wherein a transfer method of the switching intention notification from the switching destination terminal is different from a transfer method related to session establishment.   The terminal according to claim 1 or 2, wherein a transfer request to the switching destination terminal is made by the switching control means at least prior to execution of switching from the switching destination terminal to the switching source terminal. Switching system.   4. A terminal status notifying unit for confirming a status of each of the communication terminals to be switched at least managed by the terminal management unit and notifying each of the other communication terminals. The terminal switching system according to any one of the above.   Each of the communication terminals has switching validity setting means for setting validity or invalidity indicating whether or not to transfer the switching intention notification according to the situation of each of the other communication terminals notified from the terminal status notification means. The terminal switching system according to any one of claims 1 to 4. Among a plurality of communication terminals used by a specific user, in a terminal switching method for switching a communicating communication terminal to another communication terminal,
A terminal management step in which the terminal management means manages the plurality of communication terminals to be switched in advance for each specific user;
The switching control means authenticates the validity of the switching source terminal based on the dialog information when receiving a switching intention notification including at least the dialog information related to the communication from the switching source terminal in communication, and the terminal management means A switching control process for making a transfer request to the switching destination terminal searched from
A switching execution step for establishing a session with the communication terminal to be communicated, and receiving the transfer request from the switching control unit and performing a transfer process of the switching destination terminal; A terminal switching method comprising: Among a plurality of communication terminals used by a specific user, in a terminal switching program for switching a communicating communication terminal to another communication terminal,
On the computer,
Terminal management means for managing a plurality of communication terminals to be switched in advance for each specific user;
When a switching intention notification including at least dialog information related to the communication is received from the switching source terminal during communication, the switching destination retrieved from the terminal management unit is authenticated and the legitimacy of the switching source terminal based on the dialog information is authenticated. Switching control means for making a transfer request to the terminal;
It establishes a session with a communication terminal to be communicated, and receives the transfer request from the switching control unit, and functions as a switching execution unit that performs transfer processing of the switching destination terminal. Terminal switching program.

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