JP4764410B2 - Communication service providing system, address assignment device, and signal processing device - Google Patents

Description

  The present invention relates to a communication service providing system, an address assignment device, and a signal processing device.

  Conventionally, one of the communication services provided on the network is a session control type that establishes a session between a calling terminal and a receiving terminal by transferring a signal transmitted from the calling terminal to the receiving terminal. is there. For example, in a communication service based on SIP (Session Initiation Protocol) disclosed in Non-Patent Document 1, an SIP-URI (ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal is used. Uniform Resource Identifier) is used, and when the SIP server receives the SIP signal in which the SIP-URI of the receiving terminal is specified from the calling terminal, the SIP signal is transferred using the IP address assigned to the receiving terminal. Thus, a SIP session is established between the calling terminal and the receiving terminal.

  Specifically, for example, it is assumed that the SIP-URI that uniquely identifies the user who uses the receiving terminal is “UserA@example.co.jp”. Further, it is assumed that the receiving terminal has been assigned an IP address “10.1.2.1” from an HGW (Home GateWay) having a DHCP (Dynamic Host Configuration Protocol) server function. Under such a configuration, the receiving terminal requests registration of the association between the SIP-URI and the IP address in the SIP server by transmitting a REGISTER message to the SIP server. The associated correspondence is registered in the storage unit. In this way, even if the user using the calling terminal does not know the IP address assigned to the receiving terminal, the calling terminal sends the SIP signal in which the SIP-URI “UserA@example.co.jp” of the receiving terminal is designated to the SIP signal. When transmitted to the server, the SIP server searches the association using the SIP-URI as a search key, and uses the IP address “10.1.2.1” associated with the SIP-URI “UserA@example.co.jp”. To transfer the SIP signal to the receiving terminal.

  There is a technique for confirming the correspondence between the SIP-URI and the IP address of the receiving terminal when the transmitting terminal establishes a session with the receiving terminal. According to such a technique, the calling terminal stores in advance the association between the SIP-URI of the receiving terminal and the IP address in its own terminal. Under such a configuration, the calling terminal establishes a session with the receiving terminal, and associates the SIP-URI of the receiving terminal stored in the SIP server with the IP address and the receiving terminal stored in the own terminal. If the correspondence between the SIP-URI and the IP address matches, the SIP signal is transmitted using the IP address stored in the terminal itself.

  Conventionally, IP (Internet Protocol) communication between a calling terminal and a receiving terminal is realized by responding to a name resolution request transmitted from the calling terminal as one of the communication services provided on the network. There is something. For example, in a communication service based on DNS (Domain Name System) disclosed in Non-Patent Document 2, a host name is used as an ID for uniquely identifying a user who uses the receiving terminal or an ID for uniquely identifying the receiving terminal. When the name resolution device receives a name resolution request in which the host name of the receiving terminal is specified from the calling terminal, the IP address assigned to the receiving terminal is transmitted to the calling terminal as a response to the name resolution request. Thus, the calling terminal implements IP communication with the receiving terminal.

  For example, assume that the host name that uniquely identifies the receiving terminal is “ID001@example.co.jp”. In addition, it is assumed that the receiving terminal has been assigned the IP address “10.1.2.1” from the HGW having the DHCP server function. Under such a configuration, the receiving terminal sends a DNS Update message to the DNS server, thereby requesting that the association between the host name and the IP address be registered in the DNS server. The associated correspondence is registered in the storage unit. Thus, even if the user using the calling terminal does not know the IP address assigned to the receiving terminal, the calling terminal sends a DNS name resolution request in which the host name “ID001@example.co.jp” of the receiving terminal is specified. When transmitted to the server, the DNS server searches the association using the host name as a search key, and searches for the IP address “10.1.2.1” associated with the host name “ID001@example.co.jp”. It is sent to the calling terminal as a response to the name resolution request.

“SIP: Session Initiation Protocol”, [online], [searched on December 11, 2007], Internet <ftp://ftp.rfc-editor.org/in-notes/rfc3261.txt> "Dynamic Updates in the Domain Name System", RFC2136, [online], [December 11, 2007 search], Internet <ftp://ftp.rfc-editor.org/in-notes/rfc2136.txt>

  By the way, as described below, the above-described conventional technology has a problem that communication with a receiving terminal may be erroneously received by an unintended receiving terminal. In other words, it is a problem that it is not guaranteed that an incoming call arrives at the intended receiving terminal.

  For example, in a communication service based on SIP, the incoming terminal transmits a REGISTER message to the SIP server, and registers the correspondence between the SIP-URI and the IP address in the SIP server. It can be considered that the incoming terminal has left the network due to disconnection of the network. In this state, when the calling terminal transmits a SIP signal in which the SIP-URI of the receiving terminal is designated to the SIP server, the SIP server has already registered the IP address registered when the REGISTER message is received, that is, the receiving terminal has already been transmitted. The SIP signal is transferred using an unused IP address. Then, since there is no receiving terminal that should be a transfer destination of the SIP signal, the transfer of the SIP signal fails in connection after the timeout time elapses.

  Further, it is conceivable that the IP address assigned to the receiving terminal is assigned to another receiving terminal. In this state, when the calling terminal transmits a SIP signal in which the SIP-URI of the receiving terminal is specified, the SIP server, like the above, the IP address registered when the REGISTER message is received, that is, another receiving terminal The SIP signal is transferred using the IP address assigned to. Then, communication to the receiving terminal is erroneously received at an unintended receiving terminal (the receiving terminal receives annoying erroneous incoming calls).

  Even if the originating terminal confirms the association between the SIP-URI and the IP address, the association stored in the SIP server and the association actually assigned to the receiving terminal are as described above. In a state where there is a discrepancy between the terminal and the terminal, it is not possible to solve the problem that there is a possibility of erroneous incoming to an unintended receiving terminal.

  Further, for example, in a communication service by DNS, the incoming terminal transmits a DNS Update message to the DNS server, so that the correspondence between the host name and the IP address is registered in the DNS server, and then the movement of the incoming terminal It is conceivable that the wireless terminal is disconnected and the called terminal has left the network. In this state, when the calling terminal transmits a name resolution request in which the host name of the receiving terminal is specified to the DNS server, the DNS server stores the IP address registered when the DNS Update message is received, that is, the receiving terminal is An IP address that has not been used is transmitted as a response. Then, the transmitting terminal transmits a packet addressed to an IP address that is not already used, resulting in communication failure.

  Further, it is conceivable that the IP address assigned to the receiving terminal is assigned to another receiving terminal. In this state, when the calling terminal transmits a name resolution request in which the host name of the receiving terminal is specified, the DNS server, like the above, the IP address registered when the DNS Update message is received, that is, another incoming call The IP address assigned to the terminal is transmitted as a response. Then, as a result of the transmission of a packet to an unintended receiving terminal, the transmitting terminal causes information leakage (the receiving terminal is allowed to accept annoying packets).

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and provides a communication service providing system capable of guaranteeing that communication with a receiving terminal arrives at the intended receiving terminal, an address An object is to provide an allocation device and a signal processing device.

  In order to solve the above-described problems and achieve the object, the invention according to claim 1 is a signal processing device that processes a signal transmitted from a transmission terminal of a user who uses a communication service provided on a network; An address assignment device that assigns an address used for the communication service to each receiving terminal, and the signal processing device has an ID for uniquely identifying a user who uses the receiving terminal or an ID for uniquely identifying the receiving terminal. When a designated signal is received, the communication service providing system processes the signal using an address assigned to the destination terminal by the address assignment device, and the address assignment device uniquely identifies the destination terminal. When receiving assignment destination information and assigning an assignment request for requesting address assignment from the receiving terminal An allocation unit that allocates an address and responds the address to the destination terminal; and an allocation storage that stores an association between the address and the allocation destination information in the allocation storage unit when the address is allocated to the destination terminal by the allocation unit And receiving an assignment destination information query for inquiring about assignment destination information of a receiving terminal that is currently assigned by designating an address from the signal processing device, the assignment storage means is searched using the address as a search key. Responding means for acquiring allocation destination information associated with the address and responding to the signal processing apparatus with the allocation destination information, wherein the signal processing apparatus is configured to receive the address by the allocation means of the address allocation apparatus. From the assigned receiving terminal, the ID of the user who uses the receiving terminal or the receiving terminal When a storage request for storing the association between the ID of the receiving terminal, the destination information of the receiving terminal, and the address assigned to the receiving terminal is received, the storage stores the association in the terminal information storage unit And when the terminal and the signal with the ID specified are received from the transmitting terminal, the terminal information storage unit is searched using the ID as a search key, and the allocation destination information and the address associated with the ID are acquired. When the allocation information and the address are acquired by the acquisition means and the first acquisition means, the allocation information inquiry using the address as a search key is transmitted to the address allocation device and is responded by the response means. A second acquisition unit for acquiring the allocation destination information associated with the address, and the allocation destination information is acquired by the second acquisition unit. The allocation destination information acquired by the first acquisition unit and the allocation destination information acquired by the second acquisition unit are compared with each other. Signal processing means for processing the signal using the address obtained by the obtaining means.

  According to a second aspect of the present invention, there is provided a signal processing device for processing a signal transmitted from a transmitting terminal of a user who uses a communication service provided on a network, and an address used for the communication service for each receiving terminal. When the signal processing device receives an ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal, the address assigning device is assigned to the address assigning device. An address assignment device in a communication service providing system that processes the signal using an address assigned to the receiving terminal by the device, accepting assignment destination information for uniquely identifying the receiving terminal and requesting address assignment When an allocation request is received from the receiving terminal, an address is allocated and the address is assigned. Assigning means for responding to the receiving terminal, and when the assigning means assigns an address to the receiving terminal, an assignment storing means for storing the correspondence between the address and the assignment destination information in the assignment storing means, and designating the address Then, when an assignment destination information inquiry for inquiring about assignment destination information of the receiving terminal that is currently assigned the address is received from the signal processing device, the assignment destination stored in the signal processing device by the storage request received from the receiving terminal Whether or not the information and the allocation destination information acquired by the signal processing device in response to the response from the address allocation device match is compared in the signal processing device. So that the assignment storage means is searched using the address as a search key, and the address Characterized in that the acquired the allocated destination information allocation destination information that has been correlated with and a response means for responding to the signal processor.

  According to a third aspect of the present invention, there is provided a signal processing device for processing a signal transmitted from a transmitting terminal of a user who uses a communication service provided on a network, and an address used for the communication service for each receiving terminal. When the signal processing device receives an ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal, the address assigning device is assigned to the address assigning device. A signal processing device in a communication service providing system that processes the signal using an address assigned to the receiving terminal by the device, wherein the receiving terminal is assigned from the receiving terminal assigned the address by the address assigning device. The ID of the user to be used or the ID of the receiving terminal, the destination information of the receiving terminal, and Upon receiving a storage request for storing the correspondence with the address assigned to the receiving terminal, the storage means for storing the correspondence in the terminal information storage means, and the signal designated by the ID from the transmitting terminal Upon receipt, the terminal information storage means is searched using the ID as a search key, and first assignment means for obtaining assignment destination information and an address associated with the ID, and assignment destination by the first acquisition means When the information and the address are acquired, an assignment destination information inquiry for inquiring about the assignment destination information of the receiving terminal to which the address is currently assigned is sent to the address assignment device using the address as a search key, and the address assignment device responds Second acquisition means for acquiring the allocation destination information associated with the address, and the second When the assignment destination information is acquired by the obtaining means, the assignment destination information acquired by the first acquisition means is compared with the assignment destination information acquired by the second acquisition means; And signal processing means for processing the signal using the address obtained by the first obtaining means when they coincide with each other.

  According to a fourth aspect of the present invention, there is provided a signal processing device for processing a signal transmitted from a transmitting terminal of a user who uses a communication service provided on a network, and an address used for the communication service for each receiving terminal. In the communication service providing system configured with an address assignment device to be assigned to the signal, the signal processing device receives an ID that uniquely identifies a user who uses the incoming terminal or an ID that uniquely identifies the incoming terminal. When receiving, a communication service providing method for processing the signal using an address assigned to the destination terminal by the address assignment device, wherein the address assignment device accepts assignment destination information for uniquely identifying the destination terminal At the same time, when an allocation request for address allocation is received from the receiving terminal, An allocation process for allocating the address and responding the address to the destination terminal; and an allocation storage for storing an association between the address and the allocation destination information in the allocation storage unit when the address is allocated to the destination terminal by the allocation process When receiving from the signal processing device an assignment destination information inquiry for inquiring about assignment destination information of a receiving terminal that is currently assigned the address by designating the address, the assignment storage unit is searched using the address as a search key. A response step of acquiring allocation destination information associated with the address and responding to the signal processing device with the allocation destination information, wherein the signal processing device From the assigned receiving terminal, the ID of the user who uses the receiving terminal or the ID of the receiving terminal A storage step of storing the association in the terminal information storage unit upon receiving a storage request for storing the association between the destination terminal assignment destination information and the address assigned to the destination terminal; and ID A first acquisition step of searching the terminal information storage unit using the ID as a search key and acquiring the allocation destination information and the address associated with the ID; When allocation destination information and an address are acquired by the first acquisition step, the allocation destination information inquiry using the address as a search key is transmitted to the address allocation device, and the address is obtained by responding to the response step. A second acquisition step of acquiring allocation destination information associated with the second allocation step, and when the allocation destination information is acquired by the second acquisition step, the second The allocation destination information acquired by the first acquisition step is compared with the allocation destination information acquired by the second acquisition step. If they match, the allocation destination information is acquired by the first acquisition step. And a signal processing step of processing the signal by using the address.

  According to a fifth aspect of the present invention, there is provided a signal processing device for processing a signal transmitted from a transmitting terminal of a user who uses a communication service provided on a network, and an address used for the communication service for each receiving terminal. In the communication service providing system configured with an address assignment device to be assigned to the signal, the signal processing device receives an ID that uniquely identifies a user who uses the incoming terminal or an ID that uniquely identifies the incoming terminal. A communication service providing program that, when received, causes a computer to execute a communication service providing method for processing the signal using an address assigned to the receiving terminal by the address assigning device, the assignment destination uniquely identifying the receiving terminal In addition to accepting information, an allocation request for requesting address allocation is received. When receiving from the terminal, an allocation procedure for allocating an address and responding the address to the receiving terminal; and when an address is allocated to the receiving terminal by the allocation procedure, an association storage unit associates the address with the allocation destination information When an assignment information inquiry for inquiring about assignment destination information of an incoming call terminal that has been assigned the address by designating the address is received from the signal processing device, the assignment processing is performed using the address as a search key. Searching the storage unit, obtaining assignment destination information associated with the address, causing the computer as the address assignment device to execute a response procedure for responding the assignment destination information to the signal processing device, and The incoming call is received from the receiving terminal that has been assigned an address by the assignment device assignment procedure. When receiving a storage request for storing the correspondence between the ID of the user who uses the terminal or the ID of the receiving terminal, the allocation destination information of the receiving terminal, and the address assigned to the receiving terminal, When a storage procedure for storing the association in the terminal information storage unit and a signal with an ID specified are received from the transmitting terminal, the terminal information storage unit is searched using the ID as a search key and associated with the ID. A first acquisition procedure for acquiring the allocation destination information and address, and when the allocation destination information and the address are acquired by the first acquisition procedure, the allocation destination information inquiry using the address as a search key is sent to the address allocation A second acquisition procedure for transmitting to the device and acquiring the allocation destination information associated with the address by being responded to by the response procedure; When the allocation destination information is acquired by the second acquisition procedure, whether the allocation destination information acquired by the first acquisition procedure matches the allocation destination information acquired by the second acquisition procedure. When they are compared and matched, a signal processing procedure for processing the signal using the address acquired by the first acquisition procedure is executed by a computer as the signal processing device.

  According to the first, second, third, fourth, or fifth aspect of the present invention, a signal processing device that processes a signal transmitted from a transmission terminal of a user who uses a communication service provided on a network, and the communication service A signal assigned with an ID that uniquely identifies a user who uses the incoming terminal or an ID that uniquely identifies the incoming terminal. Is received, the communication service providing system processes the signal using the address assigned to the receiving terminal by the address assigning device, and the address assigning device accepts assignment destination information for uniquely identifying the receiving terminal. When an allocation request for requesting address allocation is received from the receiving terminal, the address is allocated and the address is allocated. When the address is assigned to the receiving terminal and the address is assigned to the receiving terminal, the correspondence between the address and the assignment destination information is stored in the assignment storage unit, and the address is specified and the address is actually assigned. When an assignment destination information inquiry for inquiring about the assignment destination information of the receiving terminal is received from the signal processing device, the assignment storage unit is searched using the address as a search key, and the assignment destination information associated with the address is acquired and the assignment is performed. In response to the signal processing apparatus, the signal processing apparatus receives the ID of the user who uses the receiving terminal or the ID of the receiving terminal from the receiving terminal assigned the address by the address assigning apparatus, and the incoming call. In response to a storage request for requesting to store the correspondence between the terminal allocation destination information and the address allocated to the receiving terminal. Then, the association is stored in the terminal information storage unit, and when a signal in which the ID is specified is received from the transmitting terminal, the terminal information storage unit is searched using the ID as a search key and associated with the ID. When the allocation destination information and address are acquired, and the allocation destination information and address are acquired, an allocation information inquiry using the address as a search key is transmitted to the address allocation device, and is responded to be associated with the address. When the allocation destination information is acquired, the allocation destination information acquired from the terminal information storage unit and the allocation destination information acquired from the address allocation device are compared to determine whether they match. In this case, since the signal is processed using the address acquired from the terminal information storage unit, it is ensured that the communication with the receiving terminal receives the intended receiving terminal. And become possible.

  Exemplary embodiments of a communication service providing system, an address assignment device, and a signal processing device according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, the main terms used in the embodiment, the outline and characteristics of the communication service providing system according to the first embodiment, the configuration of the communication service providing system according to the first embodiment, and the processing by the communication service providing system according to the first embodiment. , The principle of the communication service providing system according to the first embodiment, and the effects of the first embodiment will be described in order, and then the other embodiments will be described.

[Explanation of terms]
First, key terms used in the following examples will be described. First, the “communication ID” (corresponding to “ID” recited in the claims) is an ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal. The transmission terminal of the user who uses the communication service uses the communication service by transmitting a signal in which “communication ID” is designated. In other words, the “communication ID” is an ID given to the receiving terminal so that a human (such as a user of the transmitting terminal) can easily identify. Specifically, it is SIP-URI or the like in the communication service by SIP, and a host name or the like in the communication service by DNS. For example, in the case of a SIP communication service, when the originating terminal requests to establish a session with the terminating terminal, the SIP-URI of its own terminal is specified in “From” of the INVITE message, and “To” Specifies the SIP-URI of the receiving terminal.

  The “contact address” (corresponding to the “address” recited in the claims) is an address used for a communication service, and is an address assigned to a terminal (computer or communication device) connected to a network. is there. In other words, the “contact address” is an identifier assigned so that the terminal can be identified. When communication is performed between the calling terminal and the receiving terminal, the calling terminal identifies the receiving terminal by the “contact address”. Must be identifiable. Specifically, an IP address or a combination of an IP address and a port number.

  Further, “allocation destination identification information” (corresponding to “allocation destination information” described in the claims) is information for uniquely identifying a receiving terminal. In other words, the “assignment destination identification information” may be any information as long as it is information that uniquely identifies the receiving terminal to which the “contact address” is assigned. Specifically, it is a MAC (Media Access Control) address, the above-mentioned “communication ID”, or the like.

  Here, when the calling terminal uses a communication service with the receiving terminal, the calling terminal sends a signal (SIP signal, name resolution request, etc.) in which the “communication ID” of the receiving terminal is designated to the SIP server or It is transmitted to a “signal processing device” such as a DNS server. Then, in order to transfer the SIP signal or respond to the name resolution request, the “signal processing device” is assigned to an “IP gateway device” such as an HGW (“address assignment device” described in the claims). The “contact address” assigned to the receiving terminal must be acquired.

  Specifically, since the “signal processing device” registers the correspondence between the “communication ID” and the “contact address” in the storage unit for the incoming terminal, the outgoing terminal When a signal with “ID” specified is transmitted to the “signal processing device”, the “signal processing device” corresponds to the “communication ID” by searching the storage unit using the “communication ID” as a search key. The attached “contact address” is acquired as the “contact address” assigned to the receiving terminal.

  By the way, if the correspondence between the “communication ID” and the “contact address” is static in the network, “the correspondence registered in the signal processing device” and “the correspondence currently assigned to the receiving terminal” It is thought that “tick” always synchronizes. However, in practice, for example, there are many networks in which a “contact address” is dynamically assigned to a receiving terminal by, for example, DHCP, and the “contact address” assigned to the receiving terminal can be changed. In such a network, the association between the “communication ID” and the “contact address” is dynamic, and is “assigned to the signal processing device” and “assigned to the receiving terminal. “Association” does not always synchronize accurately, and there is an event that causes a discrepancy. As a result, there is a possibility that communication with the receiving terminal may be erroneously received by an unintended receiving terminal. The “communication service providing system” according to the present invention is configured to solve such problems.

[Outline and Features of Communication Service Providing System According to Embodiment 1]
Next, the outline and features of the communication service providing system according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram for explaining the outline and features of the communication service providing system (registration stage) according to the first embodiment. FIG. 2 is an outline of the communication service providing system (incoming call processing stage) according to the first embodiment. It is a figure for demonstrating and a characteristic.

  In the communication service providing system according to the first embodiment, “SIP communication service” is assumed as the communication service, “SIP server” is assumed as the signal processing device, and “user ID” is assumed as the communication ID. Assuming that “IP address” is assumed as the contact address, “user ID” is assumed as the assignment destination identification information. Further, for convenience of explanation, “incoming terminal” and “outgoing terminal” will be described separately, but the present invention is not limited to this, and the function of “terminal” as “incoming terminal” is also “outgoing terminal”. It may be a “terminal” that can also be in any position.

  As described above, in the communication service providing system according to the first embodiment, when the SIP server receives a signal in which a communication ID (user ID) is specified, the IP address assigned to the receiving terminal by the IP gateway device is obtained. The main feature is to guarantee that the communication to the receiving terminal is received at the intended receiving terminal. In the following, the main features of the communication service providing system will be described separately in a registration stage and an incoming call processing stage.

[Registration stage]
First, the receiving terminal 100 transmits an allocation request for requesting IP address allocation to the IP gateway device 200 (see (1) in FIG. 1). For example, the receiving terminal 100 according to the first embodiment transmits the user ID “User01” as the assignment destination identification information of the receiving terminal 100 by performing mutual authentication with the IP gateway device 200.

  Then, the IP gateway device 200 receives the assignment destination identification information of the receiving terminal 100 and, when receiving the assignment request from the receiving terminal 100, assigns an IP address and associates the IP address with the assignment destination identification information. It is stored in an address assignment state storage unit (corresponding to “assignment storage means” described in claims) (see (2) in FIG. 1). For example, the IP gateway device 200 assigns the IP address “10.1.2.1” and stores the correspondence between the IP address “10.1.2.1” and the assignment destination identification information “User01”.

  Subsequently, the IP gateway device 200 responds to the incoming terminal 100 with the assigned IP address (see (3) in FIG. 1). For example, the IP gateway device 200 responds to the receiving terminal 100 with the assigned IP address “10.1.2.1”.

  Next, the receiving terminal 100 that has been assigned the IP address receives the communication ID of the user who uses the receiving terminal 100, the assignment destination identification information of the receiving terminal 100, and the IP assigned to the receiving terminal 100. A storage request for storing the correspondence with the address is transmitted to the SIP server 300 (see (4) in FIG. 1). For example, the receiving terminal 100 stores a request for storing a correspondence between the user ID “User01” as the communication ID, the user ID “User01” as the assignment destination identification information, and the IP address “10.1.2.1”. Send. It should be noted that in the first embodiment, both the communication ID and the assignment destination identification information are the user ID “User01”.

  Then, when the SIP server 300 receives the storage request, the SIP server 300 stores the association in the terminal information storage unit (corresponding to the “terminal information storage unit” described in the claims) (see (5) in FIG. 1). ). For example, the SIP server 300 stores the correspondence between the user ID “User01” and the IP address “10.1.2.1” as the communication ID and assignment destination identification information.

[Incoming call processing stage]
First, the calling terminal 400 transmits a signal in which the communication ID of the user who uses the receiving terminal 100 is designated to the SIP server 300, and the SIP server 300 receives the SIP signal in which the communication ID is designated ( (See (1) in FIG. 2). For example, the SIP server 300 receives the SIP signal in which the user ID “User01” is designated as the communication ID.

  Subsequently, the SIP server 300 searches the terminal information storage unit using the communication ID received from the calling terminal 400 as a search key, and acquires the assignment destination identification information and the IP address associated with the communication ID ( (See (2) in FIG. 2). For example, the SIP server 300 acquires the user ID “User01” as the assignment destination identification information associated with the user ID “User01” received from the transmission terminal 400, and acquires the IP address “10.1.2.1”.

  Next, the SIP server 300 transmits an assignment destination identification information query using the acquired IP address as a search key to the IP gateway device 200 and is responded to by the IP gateway device 200 so as to be associated with the IP address. Allocation destination identification information is acquired (see (3) in FIG. 2). For example, the SIP server 300 transmits an assignment destination identification information query using the acquired IP address “10.1.2.1” as a search key to the IP gateway device 200. Then, the IP gateway device 200 searches the address assignment state storage unit using the IP address “10.1.2.1” as a search key, and assignee identification information “User01” associated with the IP address “10.1.2.1”. And the allocation destination identification information “User01” is returned to the SIP server 300. In this way, the SIP server 300 acquires the assignment destination identification information “User01” associated with the IP address “10.1.2.1”.

  Subsequently, the SIP server 300 compares whether the allocation destination identification information acquired from the terminal information storage unit matches the allocation destination identification information acquired from the IP gateway device 200 ((4) in FIG. 2). See). For example, the SIP server 300 compares whether or not the allocation destination identification information “User01” acquired from the terminal information storage unit matches the allocation destination identification information “User01” acquired from the IP gateway device 200.

  Then, when the allocation destination identification information acquired from the terminal information storage unit matches the allocation destination identification information acquired from the IP gateway device 200, the SIP server 300 uses the IP address acquired from the terminal information storage unit. To transfer the SIP signal (see (5) in FIG. 2). For example, the SIP server 300 transfers the SIP signal using the IP address “10.1.2.1” acquired from the terminal information storage unit.

  For this reason, according to the communication service providing system according to the first embodiment, it is possible to ensure that communication with the receiving terminal is received at the intended receiving terminal.

  Specifically, according to the first embodiment, the SIP server 300 receives from the calling terminal 400 the IP address to be used for transferring the SIP signal before transferring the SIP signal received from the calling terminal 400. Whether or not the IP address currently assigned to the receiving terminal 100 uniquely identified by the communication ID specified in the signal (the receiving terminal 100 used by the user uniquely identified by the communication ID); In other words, the SIP signal is transferred after confirming in advance that the call arrives at a truly valid receiving terminal 100 (after confirming that it does not receive an unintended receiving terminal). As a result, the SIP server 300 avoids the inconvenience based on the fact that the “association registered in the SIP server 300” and the “association currently assigned to the receiving terminal 100” are not accurately synchronized. The SIP signal is transferred. On the other hand, in the transmitting terminal 400, there is no possibility that the communication with the receiving terminal 100 is erroneously received by an unintended receiving terminal.

[Configuration of Communication Service Providing System According to Embodiment 1]
Next, the communication service providing system according to the first embodiment will be described with reference to FIGS. FIG. 3 is a block diagram illustrating a configuration of the communication service providing system according to the first embodiment, FIG. 4 is a diagram for explaining an address assignment state storage unit, and FIG. 5 is a diagram for explaining association synchronization. FIG. 6 is a diagram for explaining the terminal information storage unit.

  As illustrated in FIG. 3, the communication service providing system according to the first embodiment includes an incoming terminal 100, an IP gateway device 200, an SIP server 300, and an outgoing terminal 400. The receiving terminal 100 is connected to a router (not shown) of the network 20 via an L2SW (layer 2 switch, wireless LAN access point, etc.) 10 and an IP gateway device 200. The SIP server 300 is connected to the router of the network 20 via the L2SW 10. Further, the calling terminal 400 is also connected to the router of the network 20 via the L2SW 10. Hereinafter, the receiving terminal 100, the IP gateway device 200, and the SIP server 300 will be described in this order.

[Incoming terminal 100]
As shown in FIG. 3, the receiving terminal 100 according to the first embodiment is obtained by operating a program that provides the following functions on a general-purpose computer such as a commercially available PC (Personal Computer) or WS (Work Station). There is a communication unit 110, a registration request unit 101, and a signal receiving unit 102 that are particularly closely related to the present invention.

  The communication unit 110 includes a general interface and library for IP communication, and transmits / receives data to / from the IP gateway device 200, the SIP server 300, and the like.

  The registration request unit 101 transmits an allocation request (allocation request by a DHCP client) requesting allocation of an IP address to the IP gateway device 200, and receives the allocated IP address. In addition, the registration request unit 101 transmits a storage request for requesting storage of the correspondence between the communication ID, the assignment destination identification information, and the IP address to the SIP server 300, and receives the response.

  Specifically, the registration request unit 101 transmits an IP address allocation request to the IP gateway device 200 (address allocation unit 201 described later), and receives the IP address allocated by the address allocation unit 201. The registration request unit 101 also includes a user ID that serves as both a communication ID of the receiving terminal 100 (an ID that uniquely identifies a user who uses the receiving terminal 100) and the assignment destination identification information, and the received IP A storage request for storing the correspondence with the address is transmitted to the SIP server 300 (a registration receiving unit 301 described later), and a response indicating that the storage is stored is received.

  Here, the registration request unit 101 performs mutual authentication with the IP gateway device 200 (address allocation unit 201 described later) when transmitting the allocation request to the IP gateway device 200, so that the allocation destination of the receiving terminal 100 is allocated. The identification information is transmitted to the address assignment unit 201. For example, the registration request unit 101 allocates a user ID included in an EAP message or a certificate by performing mutual authentication with the address allocation unit 201 using EAP (Extensible Authentication Protocol) -TLS (Transport Layer Security). The MAC address is transmitted to the address assignment unit 201 as the destination identification information. Thereafter, upon receiving “EAP-Success” from the address assignment unit 201, the registration request unit 101 transmits an IP address assignment request including the MAC address of the receiving terminal 100 to the address assignment unit 201.

  In the first embodiment, the address assignment unit 201 of the IP gateway device 200 also has a function as an EAP server, and mutual authentication by EAP-TLS is performed between the registration request unit 101 and the address assignment unit 201. Although it is premised, the present invention is not limited to this, and authentication other than EAP-TLS may be performed. That is, the present invention does not depend on a mutual authentication method (including authentication using a shared key or password authentication), and authentication itself is not essential (see Example 2).

  The signal receiving unit 102 receives the SIP signal and establishes a session with the calling terminal 400. Specifically, the signal receiving unit 102 receives a SIP signal transferred from the SIP server 300 (a signal processing unit 303 described later).

[IP gateway device 200]
As shown in FIG. 3, the IP gateway device 200 according to the first embodiment is obtained by operating a program that provides the following functions on a general-purpose computer such as a commercially available PC or WS. As related to the above, a communication unit 210, an address assignment unit 201, an address assignment state storage unit 202, and an address validity response unit 203 are provided.

  The communication unit 210 includes a general interface and library for IP communication, and transmits / receives data to / from the receiving terminal 100, the SIP server 300, and the like.

  The address assignment unit 201 receives assignment destination identification information of the receiving terminal 100 and, when receiving an IP address assignment request from the receiving terminal 100, assigns an IP address and responds to the receiving terminal 100 with the IP address. Further, the address assignment unit 201 stores a correspondence between the assigned IP address and the assignment destination identification information. Specifically, the address assignment unit 201 receives the assignment destination identification information of the receiving terminal 100 by performing mutual authentication with the registration request unit 101 of the receiving terminal 100. When the address assignment unit 201 receives an assignment request from the registration request unit 101, the address assignment unit 201 assigns an IP address and responds to the registration request unit 101 with the IP address. In addition, the address assignment unit 201 stores the association between the assigned IP address and the assignment destination identification information received from the registration request unit 101 in the address assignment state storage unit 202.

  The address assignment state storage unit 202 stores the correspondence between the IP address assigned to the receiving terminal 100 and the assignment destination identification information of the receiving terminal 100. Specifically, the address assignment state storage unit 202 associates the IP address assigned to the receiving terminal 100 by the address assigning unit 201 and the assignment destination identification information of the receiving terminal 100 accepted by the address assigning unit 201. And stored by the address assignment unit 201, and the stored association is used for processing by the address validity response unit 203.

  For example, the address assignment state storage unit 202 stores the association as shown in FIG. In FIG. 4, the address assignment state storage unit 202 stores MAC addresses in association with IP addresses and assignment destination identification information. This is related to the fact that the address assignment unit 201 has received the assignment destination identification information of the receiving terminal 100 by performing mutual authentication with the registration request unit 101 of the receiving terminal 100. That is, in Example 1, the address assignment unit 201 receives a user ID as assignment destination identification information by performing mutual authentication with the registration request unit 101. After that, the address assignment unit 201 accepts an IP address assignment request from the registration request unit 101, so that the receiving terminal 100 that makes the assignment request and the receiving terminal 100 authenticated by mutual authentication are associated with each other. Information is required separately. In this respect, the MAC address is information that can be acquired even in mutual authentication, information that can also be acquired in an allocation request, and information that uniquely identifies the receiving terminal 100. For this reason, in the first embodiment, the MAC address is used as information for associating that the receiving terminal 100 that makes the allocation request and the receiving terminal 100 authenticated by mutual authentication are the same terminal, and the address allocation state storage The unit 202 also stores the MAC address in association with each other as shown in FIG.

  Incidentally, in a network in which IP addresses are dynamically assigned, the correspondence between addresses and assignment destination identification information also dynamically changes. That is, the association stored in the address assignment state storage unit 202 also dynamically changes. Specifically, the address assignment unit 201 stores the association between the IP address assigned to the terminal connected to the network and the assignment destination identification information in the address assignment state storage unit 202, but the terminal leaves the network, etc. The released IP address is assigned to another terminal connected to the network, and a new association is stored in the address assignment state storage unit 202.

  For example, the address assignment unit 201 assigns the IP address “10.1.2.3” to a terminal (assignment destination identification information “User03”) connected to the network, and associates the assigned IP address with the assignment destination identification information in the address assignment state. When stored in the storage unit 202, the address assignment state storage unit 202 stores the IP address “10.1.2.3” and the assignment destination identification information “User03” in association with each other as shown in FIG. Thereafter, when the IP address “10.1.2.3” is released, for example, when the terminal leaves the network, the address allocation unit 201 sends an IP address to another terminal (allocation destination identification information “User04”) connected to the network. “10.1.2.3” is assigned, and the correspondence between the assigned IP address and the assignment destination identification information is stored in the address assignment state storage unit 202. Then, as shown in FIG. 4B, the address assignment state storage unit 202 stores the IP address “10.1.2.3” and the assignment destination identification information “User04” in association with each other.

  When the address validity response unit 203 receives the allocation destination identification information inquiry from the SIP server 300, the address validity response unit 203 transmits the allocation destination identification information to the SIP server 300. Specifically, the address validity response unit 203 designates an IP address and makes an assignment destination identification information inquiry for inquiring about assignment destination identification information of the receiving terminal 100 that is currently assigned the IP address. When received from the signal processing unit 303), the address allocation state storage unit 202 is searched using the IP address as a search key, the allocation destination identification information associated with the IP address is acquired, and the allocation destination identification information is signaled. The data is transmitted to the processing unit 303.

[SIP server 300]
As shown in FIG. 3, the SIP server 300 in the first embodiment is obtained by operating a program that provides the following functions on a general-purpose computer such as a commercially available PC or WS, and is particularly closely related to the present invention. Related items include a communication unit 310, a registration receiving unit 301, a terminal information storage unit 302, and a signal processing unit 303.

  The communication unit 310 includes a general interface and library for IP communication, and transmits / receives data to / from the receiving terminal 100, the IP gateway device 200, the transmitting terminal 400, and the like.

  When the registration accepting unit 301 accepts a storage request for storing the correspondence between the communication ID, the assignment destination identification information, and the IP address from the receiving terminal 100, the registration accepting unit 301 stores the correspondence. Specifically, the registration receiving unit 301 receives a communication ID of the receiving terminal 100 (an ID that uniquely identifies a user who uses the receiving terminal 100), assignment destination identification information, and the like from the registration request unit 101 of the receiving terminal 100. When a storage request for storing a correspondence between a user ID that also serves as an IP address and an IP address is received, the correspondence is stored in the terminal information storage unit 302.

  The terminal information storage unit 302 stores the correspondence between the communication ID of the receiving terminal 100, the assignment destination identification information of the receiving terminal 100, and the IP address assigned to the receiving terminal 100. Specifically, the terminal information storage unit 302 stores the association received by the registration reception unit 301 by being stored by the registration reception unit 301, and the stored association is processed by the signal processing unit 303. Used.

  By the way, in a network in which IP addresses are dynamically allocated, the correspondence between communication IDs, allocation destination identification information, and IP addresses also dynamically changes. That is, the association stored in the terminal information storage unit 302 also changes dynamically. Specifically, the terminal information storage unit 302 deletes the association registered by the receiving terminal 100 when the receiving terminal 100 normally leaves the network. That is, the receiving terminal 100 communicates with the SIP server 300 at the time of shutdown, and deletes the association registered in the terminal information storage unit 302. In this way, in principle, the association stored in the terminal information storage unit 302 and the association for the terminals actually connected to the network are synchronized, and the terminal information storage unit 302 actually The correspondence about the terminal connected to is stored.

  However, the correspondence stored in the terminal information storage unit 302 and the correspondence about the terminal actually connected to the network are not synchronized, and a discrepancy may occur. For example, it is assumed that the incoming terminal 100 has left the network without deleting the association registered in the terminal information storage unit 302 by leaving the network without normally shutting down. In such a case, the IP address assigned to the receiving terminal 100 is released and may be assigned to another terminal, while the association using the IP address is stored in the terminal information storage unit 302. Therefore, the association stored in the terminal information storage unit 302 may not be synchronized with the association of the terminal actually connected to the network.

  Specifically, for example, as shown in FIG. 5, the receiving terminal 100 (assignment destination identification information “User03”) transmits an IP address assignment request to the IP gateway device 200 (see FIG. 5). When the IP gateway device 200 assigns the IP address “10.1.2.3” (see (2) in FIG. 5), the receiving terminal 100 (assignment destination identification information “User03”) is assigned. The SIP server 300 is requested to store the IP address “10.1.2.3” in the SIP server 300 (see (3) in FIG. 5), and the SIP server 300 transmits the communication ID “User03” of the receiving terminal 100 and the assignment destination identification information “ User03 "and IP address" 10.1.2.3 "are stored in association with each other (see (4) in FIG. 5). At this time, the terminal information storage unit 302 stores the association as shown in FIG.

  Thereafter, as shown in (5) of FIG. 5, it is assumed that the receiving terminal 100 (assignment destination identification information “User03”) has left the network. In addition, since the said detachment | leave was not normally performed, the terminal information storage part 302 of the SIP server 300 is still storing the correspondence shown in (4) of FIG. 5 ((A) of FIG. 6). . In such a case, since the IP address “10.1.2.3” is released, for example, when the receiving terminal 100 (assignment destination identification information “User04”) transmits an IP address assignment request to the IP gateway device 200 (FIG. 5). (See (6) of FIG. 5), the IP gateway device 200 may assign the IP address “10.1.2.3” (see (7) of FIG. 5). Then, the receiving terminal 100 (assignment destination identification information “User04”) requests that the assigned IP address “10.1.2.3” be stored in the SIP server 300 (see (8) in FIG. 5). 300 stores the communication ID “User04”, the assignment destination identification information “User04”, and the IP address “10.1.2.3” of the receiving terminal 100 in association with each other (see (9) in FIG. 5). At this time, the terminal information storage unit 302 stores the association as shown in FIG.

  Here, considering again the state shown in FIG. 5A and the state shown in FIG. 5B, the state shown in FIG. 5A is the IP address “10.1.2.3”. Meaning that although it is not assigned to any incoming terminal 100, it is stored in the terminal information storage unit 302 of the SIP server 300 as the IP address of the incoming terminal 100 (assignment destination identification information “User03”). Thus, there is a discrepancy between the “association registered in the SIP server 300” and the “association currently assigned to the receiving terminal 100”. Further, the state shown in FIG. 5B is that the IP address “10.1.2.3” is assigned to another incoming terminal 100 (assignment destination identification information “User04”), but the SIP server 300 In the terminal information storage unit 302, “correspondence registered in the SIP server 300” and “incoming terminal” in the sense that it is still stored as the IP address of the incoming terminal 100 (allocation destination identification information “User03”). There is a discrepancy between the “association currently assigned to 100”.

  The signal processing unit 303 acquires from the terminal information storage unit 302 the assignment destination identification information and the IP address associated with the communication ID specified in the received SIP signal. Next, the signal processing unit 303 acquires assignment destination identification information from the IP gateway device 200. Then, the signal processing unit 303 compares whether the allocation destination identification information acquired from the terminal information storage unit 302 matches the allocation destination identification information acquired from the IP gateway device 200, and based on the comparison result, the SIP signal Forward.

  Specifically, when receiving the SIP signal in which the communication ID is specified, the signal processing unit 303 searches the terminal information storage unit 302 using the communication ID (user ID in the first embodiment) as a search key, The user ID (same as the communication ID in the first embodiment) and the IP address associated with the communication ID are acquired. Next, the signal processing unit 303 transmits an assignment destination identification information query using the acquired IP address as a search key to the IP gateway device 200 and is responded to by the IP gateway device 200 to be associated with the IP address. The user ID is acquired. Then, the signal processing unit 303 compares whether or not the user ID acquired by searching the terminal information storage unit 302 matches the user ID acquired from the IP gateway device 200. The SIP signal is transferred using the IP address obtained by searching the storage unit 302. If they do not match, the SIP signal is not transferred, and an error or the reason that the transfer could not be performed is returned to the calling terminal 400.

[Processing Procedure by Communication Service Providing System According to Embodiment 1]
Next, a processing procedure performed by the communication service providing system according to the first embodiment will be described with reference to FIGS. FIG. 7 is a sequence diagram illustrating processing (registration processing stage) by the communication service providing system according to the first embodiment. FIG. 8 is a sequence diagram illustrating processing (incoming processing stage) by the communication service providing system according to the first embodiment. FIG. Hereinafter, the registration processing stage and the incoming call processing stage will be described in this order.

[Registration processing stage]
First, mutual authentication processing by “EAP-TLS” is executed between the registration request unit 101 of the receiving terminal 100 and the address assignment unit 201 of the IP gateway device 200 (step S101).

  If the mutual authentication is successful, the address assignment unit 201 receives the user ID (assignment destination identification information) and the MAC address included in the EAP message or certificate transmitted from the registration request unit 101, and receives the user ID and the MAC. The association (record) with the address is stored (registered) in the address assignment state storage unit 202 (step S102). After that, the address assignment unit 201 transmits “EAP-Success” indicating that the authentication is successful to the registration request unit 101 (step S103).

  Subsequently, the registration request unit 101 that has received “EAP-Success” transmits an IP address allocation request including the MAC address of the receiving terminal 100 to the address allocation unit 201 (step S104).

  Then, the address assignment unit 201 that has received the IP address assignment request acquires the MAC address included in the IP address assignment request (step S105), and assigns the IP address (step S106).

  Furthermore, the address assignment unit 201 searches the address assignment state storage unit 202 using the MAC address acquired in step S105 as a search key, acquires a user ID associated with the MAC address (step S107), and step S107. The IP address assigned in step S106 is additionally stored (registered) in the association (record) of the user ID (assignment destination identification information) retrieved in (step S108). Thus, the address assignment unit 201 stores the association between the IP address and the user ID (assignment destination identification information) in the address assignment state storage unit 202.

  Subsequently, the address assignment unit 201 includes the IP address in the response to the IP address assignment request and returns it to the registration request unit 101 (step S109).

  Next, when the registration request unit 101 transmits “SIP-REGISTER” to the registration reception unit 301 of the SIP server 300 (step S110), “401 Unauthorized” is transmitted from the registration reception unit 301 as a response (step S110). S111).

  Subsequently, the registration request unit 101 transmits a “REGISTER message”, which is a registration request including the user ID (communication ID and allocation destination identification information) and the IP address received from the address allocation unit 201, to the SIP server 300. (Step S112).

  The registration receiving unit 301 of the SIP server 300 stores (registers) the correspondence between the user ID (communication ID and allocation destination identification information) received from the registration request unit 101 and the IP address in the terminal information storage unit 302 (step). S113).

  Thereafter, the registration receiving unit 301 returns “200 OK” to the registration request unit 101 (step S114).

[Incoming call processing stage]
First, when the transmitting terminal 400 transmits an “INVITE message” that is an incoming request in which the user ID (communication ID) of the incoming terminal 100 is specified, the signal processing unit 303 of the SIP server 300 receives the incoming request ( Step S201).

  Then, the signal processing unit 303 acquires a user ID (communication ID) from the SIP-URI or Authorization Header included in the “INVITE message”, searches the terminal information storage unit 302 using the user ID as a search key, An IP address associated with the user ID is acquired (step S202). The user ID used as the search key is also stored in the terminal information storage unit 302 in the meaning of the assignment destination identification information.

  Further, the signal processing unit 303 transmits an allocation destination identification information inquiry using the acquired IP address as a search key to the address validity response unit 203 (step S203). Then, the address validity response unit 203 searches the address assignment state storage unit 202 using the received IP address as a search key, and acquires a user ID (assignment destination identification information) associated with the IP address ( Step S204), and returns to the SIP server 300 (Step S205).

  The signal processing unit 303 receives from the address validity response unit 203 the user ID (which also serves as the assignment destination identification information in the first embodiment) that is a search key when searching the terminal information storage unit 302. It is compared (collated) whether or not the user ID (assignment destination identification information) matches (step S206).

  If the collation results match, the signal processing unit 303 transfers the “INVITE message” received from the calling terminal 400 in step S201 to the signal receiving unit 102 of the receiving terminal 100. On the other hand, if the collation result does not match, the signal processing unit 303 does not transfer the “INVITE message” received from the calling terminal 400 to the signal receiving unit 102 of the receiving terminal 100 in step S201, and an error occurs. Or, the reason why the data could not be transferred is returned to the calling terminal 400.

  In this way, the “INVITE message” is transferred to the receiving terminal 100 intended by the transmitting terminal 400. Thereafter, when the receiving terminal 100 responds with “200 OK”, a session is established between them.

[Principle of Communication Service Providing System According to Embodiment 1]
Here, the principle of the communication service providing system according to the first embodiment will be described again with reference to FIG. FIG. 9 is a diagram for explaining the principle of the communication service providing system according to the first embodiment.

  As shown in FIG. 9, in the communication service providing system according to the first embodiment, information is associated in the order of (1) to (13). That is, as shown in (1) of FIG. 9, the registration request unit 101 of the receiving terminal 100 transmits the allocation destination identification information (user ID) to the address allocation unit 201 of the IP gateway device 200, whereby the address allocation unit 201 stores the association between the IP address and the assignment destination identification information (user ID) in the address assignment state storage unit 202 (see (2) in FIG. 9).

  Since the IP address is transmitted to the registration request unit 101 as a response by the address allocation unit 201 (see (3) in FIG. 9), the registration request unit 101 includes the communication ID (user ID) and the allocation destination identification information. The association between the (user ID) and the IP address is stored in the registration receiving unit 301 of the SIP server 300 (see (4) and (5) in FIG. 9).

  In such a state, as shown in (6) of FIG. 9, when the signal processing unit 303 of the SIP server 300 receives a signal transmission request specifying the communication ID (user ID), the signal processing unit 303 The terminal information storage unit 302 is searched using the communication ID (user ID) thus made as a search key (see (7) in FIG. 9), and the assigned destination identification information (user ID) and the IP address associated with each other are searched. Obtain (see (8) in FIG. 9).

  Then, the signal processing unit 303 makes an inquiry about the assignment destination identification information to the address validity response unit 203 of the IP gateway device 200 using the IP address acquired by the search as a search key (see (9) in FIG. 9). ). Then, the address validity response unit 203 searches the address assignment status storage unit 202 using the IP address as a search key (see (10) in FIG. 9), and assigns the assigned destination identification information (user ID) associated therewith. (See (11) in FIG. 9).

  Subsequently, when the address validity response unit 203 transmits the acquired assignment destination identification information (user ID) as a response to the signal processing unit 303 (see (12) in FIG. 9), the signal processing unit 303 receives the terminal information. Whether the allocation destination identification information (user ID) acquired from the storage unit 302 matches the allocation destination identification information (user ID) acquired from the address validity response unit 203 (see (8) in FIG. 9). Are compared, and if they match, the signal is transferred (see (13) in FIG. 9).

  In the communication service providing system according to the first embodiment, by associating information in this manner, “association registered in the SIP server 300” and “association currently assigned to the receiving terminal 100” are accurately determined. The SIP signal can be transferred while avoiding the inconvenience due to not being synchronized.

[Effect of Example 1]
As described above, according to the first embodiment, a signal processing apparatus that processes a signal transmitted from a transmission terminal of a user who uses a communication service provided on a network, and an address used for the communication service An address allocating device that is assigned to each receiving terminal, and the signal processing device receives an address that specifies an ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal. A communication service providing system for processing the signal using an address assigned to the receiving terminal by the assigning device, wherein the address assigning device receives assignment destination information for uniquely identifying the receiving terminal and assigns the address. When the requested allocation request is received from the receiving terminal, an address is allocated and the address is assigned. In response to the incoming terminal, when an address is assigned to the incoming terminal, the correspondence between the address and the assignment destination information is stored in the assignment storage unit, the address is designated, and the address of the incoming terminal currently assigned is assigned. When an allocation destination information query for querying allocation destination information is received from the signal processing device, the allocation storage unit is searched using the address as a search key, the allocation destination information associated with the address is acquired, and the allocation destination information is obtained. In response to the signal processing apparatus, the signal processing apparatus assigns the ID of the user who uses the receiving terminal or the ID of the receiving terminal and the allocation of the receiving terminal from the receiving terminal that has been assigned an address by the address assigning apparatus. When a storage request for storing the correspondence between the destination information and the address assigned to the receiving terminal is received When the association is stored in the terminal information storage unit and a signal in which the ID is specified is received from the transmitting terminal, the terminal information storage unit is searched using the ID as a search key, and the allocation destination information associated with the ID When the allocation destination information and the address are acquired, an allocation destination information inquiry using the address as a search key is transmitted to the address allocation device, and the allocation is associated with the address by responding. When the destination information is acquired and the allocation destination information is acquired, the allocation destination information acquired from the terminal information storage unit is compared with the allocation destination information acquired from the address allocation device. Since the signal is processed using the address acquired from the terminal information storage unit, it is possible to guarantee that the communication with the receiving terminal is received at the intended receiving terminal. become.

  Specifically, according to the first embodiment, the combination of the IP address and user ID registered in the SIP server when the incoming request is received, and the IP address registered in the IP gateway device when connected to the network, By matching the combination with the user ID and not matching, it is possible to prevent erroneous incoming calls by not performing signal transfer.

  That is, according to the conventional method, there is a case where an incoming call is received by an unintended communication partner when a user who uses the incoming terminal or when the incoming terminal is moved or the network connection is disconnected. However, according to the communication service providing system according to the first embodiment, when the correspondence between the user ID registered in the SIP server and the IP address is different from the actual situation, by not receiving the incoming call, It can prevent false incoming calls and information leakage.

[NAPT environment]
In the first embodiment, the case where the contact address is an IP address has been described. In other words, this is an application example in an environment where all receiving terminals use a global IP address. However, the present invention is not limited to this. For example, by using a combination of an IP address and a port number as a contact address, the communication service providing system according to the present invention can be applied even to an incoming terminal existing under a NAPT (Network Address Port Translation) environment. it can. In this case, a NAPT function is added to the IP gateway device 200.

[B2BUA]
The signal processing device may be B2BUA. When the signal processing device is applied to B2BUA, it is considered that the NAPT environment is generally used. Therefore, in the following, the terminal information storage unit of the B2BUA350 serving as the signal processing device and the IP gateway device 200 will be described. The IP address stored in the address assignment state storage unit will be described as a private IP address. On the other hand, the IP address stored in the terminal information storage unit of the SIP server 300 will be described as the global IP address of the B2BUA 350. Specifically, the combination “192.168.0.10:20000” of the IP address and the port number is stored in the terminal information storage unit of the B2BUA 350, and the IP address and port are stored in the address assignment state storage unit of the IP gateway device 200. The combination “192.168.0.10:20000” with the number is stored, and the combination “10.1.2.1:10000” with the IP address and the port number is stored in the terminal information storage unit of the SIP server 300.

  Under such a configuration, for example, as shown in FIG. 10, the calling terminal 400 transmits an “INVITE message” designating the communication ID “User01” to the SIP server 300 (see (1) in FIG. 10). ) Assume that the SIP server 300 transfers the “INVITE message” to the B2BUA 350 of the receiving terminal 100 (see (2) in FIG. 10).

  Then, the B2BUA 350 serving as the signal processing device searches the terminal information storage unit using the communication ID “User01” as a search key, and assignee identification information “User01” associated with the communication ID “User01”. And a combination “192.168.0.10:20000” of the IP address and the port number is acquired. In addition, the B2BUA 350 transmits an allocation destination identification information inquiry using the combination “192.168.0.10:20000” of the acquired IP address and port number as a search key to the IP gateway device 200, and acquires the allocation destination identification information “User01”. (Refer to (3) in FIG. 10).

  Then, the B2BUA 350 compares whether or not the allocation destination identification information “User01” acquired from the terminal information storage unit matches the allocation destination identification information “User01” acquired from the IP gateway device 200 ((( 4)), if they match, the “INVITE message” is transferred to the receiving terminal 100 using the IP address “192.168.0.10” (see (5) in FIG. 10).

  As in the first embodiment, the IP gateway device has a function as an authentication server, and performs mutual authentication (user authentication) when the receiving terminal connects to the network. An example of assigning addresses was explained. On the other hand, in the second embodiment, the IP gateway device has only the DHCP server function (no authentication server function), and when the receiving terminal connects to the SIP server, the IMS (IP Multimedia Subsystem )-It differs from the first embodiment in that user authentication is performed after establishing IPSec communication as defined by Security. In the first embodiment, the method using the communication ID as the assignment destination identification information has been described. In the second embodiment, a method using the MAC address as the assignment destination identification information will be described.

[Outline and Features of Communication Service Providing System According to Embodiment 2]
First, the outline and features of the communication service providing system according to the second embodiment will be described with reference to FIGS. 11 and 12. FIG. 11 is a diagram for explaining the outline and features of the communication service providing system (registration stage) according to the second embodiment. FIG. 12 is an outline of the communication service providing system (incoming call processing stage) according to the second embodiment. It is a figure for demonstrating and a characteristic.

  In the communication service providing system according to the second embodiment, “SIP communication service” is assumed as the communication service, “SIP server” is assumed as the signal processing device, and “user ID” is assumed as the communication ID. Assuming that “IP address” is assumed as the contact address, “MAC address” is assumed as the assignment destination identification information.

[Registration stage]
First, the receiving terminal 100 transmits an allocation request for requesting IP address allocation to the IP gateway device 200 (see (1) in FIG. 11). At this time, the allocation request transmitted by the receiving terminal 100 includes the MAC address of the receiving terminal 100.

  Then, the IP gateway device 200 receives the assignment destination identification information of the receiving terminal 100 and, when receiving the assignment request from the receiving terminal 100, assigns an IP address and associates the IP address with the assignment destination identification information. It is stored in the address assignment state storage unit (see (2) in FIG. 11). For example, the IP gateway device 200 assigns the IP address “10.1.2.1”, and stores the correspondence between the IP address “10.1.2.1” and the assignment destination identification information “MAC01”.

  Subsequently, the IP gateway device 200 responds to the incoming terminal 100 with the assigned IP address (see (3) in FIG. 11). For example, the IP gateway device 200 responds to the receiving terminal 100 with the assigned IP address “10.1.2.1”.

  Next, the receiving terminal 100 that has been assigned the IP address receives the communication ID of the user who uses the receiving terminal 100, the assignment destination identification information of the receiving terminal 100, and the IP assigned to the receiving terminal 100. A storage request for storing the correspondence with the address is transmitted to the SIP server 300 (see (4) in FIG. 11). At this time, in the second embodiment, the receiving terminal 100 transmits the storage request to the SIP server 300 after establishing the IPSec communication. For example, the receiving terminal 100 requests a storage request to store the correspondence between the user ID “User01” as the communication ID, the MAC address “MAC01” as the assignment destination identification information, and the IP address “10.1.2.1”. Send. Note that in the second embodiment, the communication ID and the assignment destination identification information are different.

  Then, when receiving the storage request, the SIP server 300 stores the association in the terminal information storage unit (see (5) in FIG. 11). For example, the SIP server 300 stores a correspondence between the user ID “User01” as the communication ID, the MAC address “MAC01” as the assignment destination identification information, and the IP address “10.1.2.1”.

[Incoming call processing stage]
First, the calling terminal 400 transmits a signal in which the communication ID of the user who uses the receiving terminal 100 is designated to the SIP server 300, and the SIP server 300 receives the SIP signal in which the communication ID is designated ( (See (1) in FIG. 12). For example, the SIP server 300 receives the SIP signal in which the user ID “User01” is designated as the communication ID.

  Subsequently, the SIP server 300 searches the terminal information storage unit using the communication ID received from the calling terminal 400 as a search key, and acquires the assignment destination identification information and the IP address associated with the communication ID ( (See (2) in FIG. 12). For example, the SIP server 300 acquires the MAC address “MAC01” as the assignment destination identification information associated with the user ID “User01” received from the transmission terminal 400, and acquires the IP address “10.1.2.1”.

  Next, the SIP server 300 transmits an assignment destination identification information query using the acquired IP address as a search key to the IP gateway device 200 and is responded to by the IP gateway device 200 so as to be associated with the IP address. Allocation destination identification information is acquired (see (3) in FIG. 12). For example, the SIP server 300 transmits an assignment destination identification information query using the acquired IP address “10.1.2.1” as a search key to the IP gateway device 200. Then, the IP gateway device 200 searches the address assignment state storage unit using the IP address “10.1.2.1” as a search key, and assignee identification information “MAC01” associated with the IP address “10.1.2.1”. And responds to the SIP server 300. In this way, the SIP server 300 acquires the assignment destination identification information “MAC01” associated with the IP address “10.1.2.1”.

  Subsequently, the SIP server 300 compares whether or not the allocation destination identification information acquired from the terminal information storage unit matches the allocation destination identification information acquired from the IP gateway device 200 ((4) in FIG. 12). See). For example, the SIP server 300 compares whether or not the allocation destination identification information “MAC01” acquired from the terminal information storage unit matches the allocation destination identification information “MAC01” acquired from the IP gateway device 200.

  Then, when the allocation destination identification information acquired from the terminal information storage unit matches the allocation destination identification information acquired from the IP gateway device 200, the SIP server 300 uses the IP address acquired from the terminal information storage unit. To transfer the SIP signal (see (5) of FIG. 12). For example, the SIP server 300 transfers the SIP signal using the IP address “10.1.2.1” acquired from the terminal information storage unit.

  For this reason, according to the communication service providing system according to the second embodiment, it is possible to ensure that communication with the receiving terminal is received at the intended receiving terminal.

[Configuration of Communication Service Providing System According to Second Embodiment]
Next, a communication service providing system according to the second embodiment will be described with reference to FIGS. 13 and 14. FIG. 13 is a diagram for explaining the address assignment state storage unit, and FIG. 14 is a diagram for explaining the terminal information storage unit.

  The communication service providing system according to the second embodiment includes the receiving terminal 100, the IP gateway device 200, the SIP server 300, and the transmitting terminal 400, and has the same configuration as the communication service providing system according to the first embodiment. . In the following, only the address assignment state storage unit 202 and the terminal information storage unit 302, which store different information from the first embodiment, will be described briefly.

[IP gateway device 200]
As in the first embodiment, the address assignment state storage unit 202 stores the correspondence between the IP address assigned to the receiving terminal 100 and the assignment destination identification information of the receiving terminal 100. For example, the address assignment state storage unit 202 stores a correspondence between the MAC address and the IP address as shown in FIG.

  For example, the address assignment unit 201 assigns the IP address “10.1.2.3” to the terminal (assignment destination identification information “MAC03”) connected to the network, and associates the assigned IP address with the assignment destination identification information in the address assignment state. When stored in the storage unit 202, the address assignment state storage unit 202 stores the IP address “10.1.2.3” and the assignment destination identification information “MAC03” in association with each other as shown in FIG. Thereafter, when the IP address “10.1.2.3” is released, for example, when the terminal leaves the network, the address allocation unit 201 sends an IP address to another terminal (allocation destination identification information “MAC04”) connected to the network. “10.1.2.3” is assigned, and the correspondence between the assigned IP address and the assignment destination identification information is stored in the address assignment state storage unit 202. Then, as shown in FIG. 13B, the address assignment state storage unit 202 stores the IP address “10.1.2.3” and the assignment destination identification information “MAC04” in association with each other.

[SIP server 300]
Similarly to the first embodiment, the terminal information storage unit 302 stores the correspondence between the communication ID of the receiving terminal 100, the assignment destination identification information of the receiving terminal 100, and the IP address assigned to the receiving terminal 100. . For example, as illustrated in FIG. 14, the terminal information storage unit 20 stores associations between user IDs, MAC addresses, and IP addresses. 14A and 14B show a manner in which the correspondence between the communication ID, the assignment destination identification information, and the IP address dynamically changes, as in the first embodiment.

[Procedure for Processing by Communication Service Providing System According to Embodiment 2]
Next, a processing procedure by the communication service providing system according to the second embodiment will be described with reference to FIGS. FIG. 15 is a sequence diagram illustrating processing (registration processing stage) by the communication service providing system according to the second embodiment. FIG. 16 is a sequence diagram illustrating processing (incoming processing stage) by the communication service providing system according to the second embodiment. FIG. Hereinafter, the registration processing stage and the incoming call processing stage will be described in this order.

[Registration processing stage]
First, the registration request unit 101 of the receiving terminal 100 transmits an IP address assignment request including the MAC address (assignment destination identification information) of the receiving terminal 100 to the address assignment unit 201 (step S301).

  Then, the address assignment unit 201 that has received the IP address assignment request acquires the MAC address included in the IP address assignment request (step S302), and assigns the IP address (step S303).

  Furthermore, the address assignment unit 201 stores (registers) the association (record) between the IP address and the MAC address (assignment destination identification information) in the address assignment state storage unit 202 (step S304).

  Subsequently, the address allocation unit 201 includes the IP address in the response to the IP address allocation request and returns it to the registration request unit 101 (step S305).

  Next, the registration request unit 101 performs mutual authentication with the registration receiving unit 301 of the SIP server 300 by “IMS-AKA (IMS: IP Multimedia Subsystem, AKA: Authentication and Key Agreement)” (step S306). ). Specifically, when the registration request unit 101 transmits “SIP-REGISTER” to the registration reception unit 301 of the SIP server 300, “401 Unauthorized” is transmitted from the registration reception unit 301 as a response (step S307). The registration request unit 101 uses the parameters (RAND (Random challenge), AUTN (Authentication Token)) included in the “401 Unauthorized” to generate a shared key with the registration receiving unit 301.

  Thereafter, IP Sec is established between the registration request unit 101 and the registration receiving unit 301 using the generated shared key (step S308).

  Subsequently, the registration request unit 101 is a registration including a user ID (communication ID), a MAC address (allocation destination identification information), and an IP address received from the address allocation unit 201 in the IP Sec ESP transport mode. The request “REGISTER message” is transmitted to the SIP server 300 (step S309).

  The registration reception unit 301 of the SIP server 300 stores the association between the user ID (communication ID), the MAC address (assignment identification information), and the IP address received from the registration request unit 101 in the terminal information storage unit 302 (registration). (Step S310).

  Thereafter, the registration receiving unit 301 returns “200 OK” to the registration request unit 101 (step S311).

[Incoming call processing stage]
First, when the transmitting terminal 400 transmits an “INVITE message” that is an incoming request in which the user ID (communication ID) of the incoming terminal 100 is specified, the signal processing unit 303 of the SIP server 300 receives the incoming request ( Step S401).

  Then, the signal processing unit 303 acquires a user ID (communication ID) from the SIP-URI or Authorization Header included in the “INVITE message”, searches the terminal information storage unit 302 using the user ID as a search key, The MAC address (assignment destination identification information) and IP address associated with the user ID are acquired (step S402).

  Further, the signal processing unit 303 transmits an allocation destination identification information query using the acquired IP address as a search key to the address validity response unit 203 (step S403). Then, the address validity response unit 203 searches the address assignment state storage unit 202 using the received IP address as a search key, and acquires a MAC address (assignment destination identification information) associated with the IP address ( In step S404, the assignment destination identification information is returned to the SIP server 300 (step S405).

  The signal processing unit 303 determines whether or not the MAC address (allocation destination identification information) acquired from the terminal information storage unit 302 matches the MAC address (allocation destination identification information) received from the address validity response unit 203. Comparison (collation) is performed (step S406).

  If the collation results match, the signal processing unit 303 transfers the “INVITE message” received from the calling terminal 400 in step S 401 to the signal receiving unit 102 of the receiving terminal 100. On the other hand, if the collation result does not match, the signal processing unit 303 does not transfer the “INVITE message” received from the transmission terminal 400 in step S401 to the signal reception unit 102 of the reception terminal 100, and an error occurs. Or, the reason why the data could not be transferred is returned to the calling terminal 400.

  In this way, the “INVITE message” is transferred to the receiving terminal 100 intended by the transmitting terminal 400. Thereafter, when the receiving terminal 100 responds with “200 OK”, a session is established between them.

[Principle of Communication Service Providing System According to Second Embodiment]
Here, the principle of the communication service providing system according to the second embodiment will be described again with reference to FIG. FIG. 17 is a diagram for explaining the principle of the communication service providing system according to the second embodiment.

  As shown in FIG. 17, in the communication service providing system according to the first embodiment, information is associated in the order of (1) to (13). That is, as shown in (1) of FIG. 17, the registration request unit 101 of the receiving terminal 100 transmits the allocation destination identification information (MAC address) to the address allocation unit 201 of the IP gateway device 200, whereby the address allocation unit 201 stores the correspondence between the IP address and the assignment destination identification information (MAC address) in the address assignment state storage unit 202 (see (2) in FIG. 17).

  Since the IP address is transmitted to the registration request unit 101 as a response by the address allocation unit 201 (see (3) in FIG. 17), the registration request unit 101 includes the communication ID (user ID) and the allocation destination identification information. The association between the (MAC address) and the IP address is stored in the registration receiving unit 301 of the SIP server 300 (see (4) and (5) in FIG. 17).

  In this state, as shown in (6) of FIG. 17, when the signal processing unit 303 of the SIP server 300 receives the signal transmission request specifying the communication ID (user ID), the signal processing unit 303 The terminal information storage unit 302 is searched using the communication ID (user ID) thus made as a search key (see (7) in FIG. 17), and the assigned destination identification information (MAC address) and the IP address are associated with each other. Obtain (see (8) in FIG. 17).

  Then, the signal processing unit 303 makes an inquiry about the allocation destination identification information to the address validity response unit 203 of the IP gateway device 200 using the IP address acquired by the search as a search key (see (9) in FIG. 17). ). Then, the address validity response unit 203 searches the address assignment state storage unit 202 using the IP address as a search key (see (10) in FIG. 17), and assigns the assigned destination identification information (MAC address). Obtain (see (11) in FIG. 17).

  Subsequently, when the address validity response unit 203 transmits the acquired assignment destination identification information (MAC address) as a response to the signal processing unit 303 (see (12) in FIG. 17), the signal processing unit 303 receives the terminal information. Whether the allocation destination identification information (MAC address) acquired from the storage unit 302 matches the allocation destination identification information (MAC address) acquired from the address validity response unit 203 (see (8) in FIG. 17). Are compared, and if they match, the signal is transferred (see (13) in FIG. 17).

  The communication service providing system according to the second embodiment associates information in this way, so that “association registered in the SIP server 300” and “association currently assigned to the receiving terminal 100” are accurately determined. The SIP signal can be transferred while avoiding the inconvenience due to not being synchronized.

[Effect of Example 2]
In the first embodiment, the IP gateway device needs an authentication server function, and the DHCP server function on the IP gateway device assigns an IP address in conjunction with the authentication server function, and the assigned IP address is stored in the address assignment storage unit. It was necessary to register. According to the second embodiment, only the DHCP server function is required on the IP gateway device, and the authentication server function is not necessary. Therefore, the cost of the IP gateway device can be reduced. Considering the arrangement of an IP gateway device for each base connected to the network, a large cost reduction can be expected. The SIP server, which is a signal processing device, secures a secure channel such as IP Sec with the receiving terminal and performs user authentication.

  Now, as the first and second embodiments, the case where the signal processing apparatus is a SIP server has been described. However, the present invention is not limited to this. For example, the present invention can be similarly applied to a case where the signal processing apparatus is a DNS server. Therefore, in the third embodiment, a case where the signal processing device is a DNS server will be described.

[Outline and Features of Communication Service Providing System According to Embodiment 3]
First, the outline and characteristics of the communication service providing system according to the third embodiment will be described with reference to FIGS. 18 and 19. FIG. 18 is a diagram for explaining the outline and features of the communication service providing system (registration stage) according to the third embodiment. FIG. 19 is an outline of the communication service providing system (incoming call processing stage) according to the third embodiment. It is a figure for demonstrating and a characteristic.

  In the communication service providing system according to the third embodiment, a “DNS communication service” is assumed as the communication service, a “DNS server” is assumed as the signal processing device, and a “host name” is assumed as the communication ID. Assuming that “IP address” is assumed as the contact address, “user ID” is assumed as the assignment destination identification information.

[Registration stage]
First, the receiving terminal 100 transmits an allocation request for requesting IP address allocation to the IP gateway device 200 (see (1) in FIG. 18).

  Then, the IP gateway device 200 receives the assignment destination identification information of the receiving terminal 100 and, when receiving the assignment request from the receiving terminal 100, assigns an IP address and associates the IP address with the assignment destination identification information. It is stored in the address assignment state storage unit (see (2) in FIG. 18). For example, the IP gateway device 200 assigns the IP address “10.1.2.1” and stores the correspondence between the IP address “10.1.2.1” and the assignment destination identification information “User01”.

  Subsequently, the IP gateway device 200 responds to the incoming terminal 100 with the assigned IP address (see (3) in FIG. 18). For example, the IP gateway device 200 responds to the receiving terminal 100 with the assigned IP address “10.1.2.1”.

  Next, the receiving terminal 100 that has been assigned the IP address receives the communication ID of the user who uses the receiving terminal 100, the assignment destination identification information of the receiving terminal 100, and the IP assigned to the receiving terminal 100. A storage request for storing the correspondence with the address is transmitted to the DNS server 500 (see (4) in FIG. 18). For example, the receiving terminal 100 stores a request for storing the correspondence between the host name “ID001” as the communication ID, the user ID “User01” as the assignment destination identification information, and the IP address “10.1.2.1”. Send.

  Then, when the DNS server 500 receives the storage request, the DNS server 500 stores the association in the terminal information storage unit (see (5) in FIG. 18). For example, the DNS server 500 stores a correspondence between the host name “ID001” as the communication ID, the user ID “User01” as the assignment destination identification information, and the IP address “10.1.2.1”.

[Incoming call processing stage]
First, the calling terminal 400 transmits a name resolution request in which the communication ID of the user who uses the receiving terminal 100 is designated to the DNS server 500, and the DNS server 500 sends a name resolution request in which the communication ID is designated. Receive (see (1) in FIG. 19). For example, the DNS server 500 receives a name resolution request in which the host name “ID001” is specified as the communication ID.

  Subsequently, the DNS server 500 searches the terminal information storage unit using the communication ID received from the calling terminal 400 as a search key, and acquires the assignment destination identification information and the IP address associated with the communication ID ( (See (2) in FIG. 19). For example, the DNS server 500 acquires the user ID “User01” as the assignment destination identification information associated with the host name “ID001” received from the transmission terminal 400, and acquires the IP address “10.1.2.1”.

  Next, the DNS server 500 transmits an assignment destination identification information query using the acquired IP address as a search key to the IP gateway device 200 and responds by the IP gateway device 200 so that the DNS server 500 is associated with the IP address. Allocation destination identification information is acquired (see (3) of FIG. 19). For example, the DNS server 500 transmits an assignment destination identification information query using the acquired IP address “10.1.2.1” as a search key to the IP gateway device 200. Then, the IP gateway device 200 searches the address assignment state storage unit using the IP address “10.1.2.1” as a search key, and assignee identification information “User01” associated with the IP address “10.1.2.1”. And assigning the identification information “User01” to the DNS server 500 as a response. In this way, the DNS server 500 acquires the assignment destination identification information “User01” associated with the IP address “10.1.2.1”.

  Subsequently, the DNS server 500 compares whether the allocation destination identification information acquired from the terminal information storage unit matches the allocation destination identification information acquired from the IP gateway device 200 ((4) in FIG. 19). See). For example, the DNS server 500 compares whether or not the allocation destination identification information “User01” acquired from the terminal information storage unit matches the allocation destination identification information “User01” acquired from the IP gateway device 200.

  Then, the DNS server 500 determines the IP address acquired from the terminal information storage unit when the allocation destination identification information acquired from the terminal information storage unit matches the allocation destination identification information acquired from the IP gateway device 200. To process the signal (see (5) of FIG. 19). For example, the DNS server 500 transmits the IP address “10.1.2.1” acquired from the terminal information storage unit as a response to the name resolution request.

  For this reason, according to the communication service providing system according to the third embodiment, it is possible to guarantee that communication with the receiving terminal is received at the intended receiving terminal.

[Configuration of Communication Service Providing System According to Embodiment 3]
Next, a communication service providing system according to the third embodiment will be described with reference to FIGS. FIG. 20 is a block diagram illustrating the configuration of the communication service providing system according to the third embodiment, FIG. 21 is a diagram for explaining the address assignment state storage unit, and FIG. 22 is a diagram illustrating the terminal information storage unit. It is a figure for doing.

  As shown in FIG. 20, the communication service providing system according to the third embodiment includes an incoming terminal 100, an IP gateway device 200, a DNS server 500, and a transmitting terminal 400. In the following, only the address allocation state storage unit 202 and the terminal information storage unit 502, which store different information from the previous embodiments, will be described briefly.

[IP gateway device 200]
As in the first embodiment, the address assignment state storage unit 202 stores the correspondence between the IP address assigned to the receiving terminal 100 and the assignment destination identification information of the receiving terminal 100. For example, as shown in FIG. 21, the address assignment state storage unit 202 stores a correspondence between a MAC address, a user ID (assignment destination identification information), and an IP address.

[DNS server 500]
The terminal information storage unit 502 stores the correspondence between the communication ID of the receiving terminal 100, the assignment destination identification information of the receiving terminal 100, and the IP address assigned to the receiving terminal 100. For example, as illustrated in FIG. 22, the terminal information storage unit 502 stores a correspondence between a host name, a user ID, and an IP address. Note that (A) and (B) in FIG. 22 show how the correspondence between the communication ID, the assignment destination identification information, and the IP address changes dynamically as in the previous embodiments. .

[Procedure for Processing by Communication Service Providing System According to Embodiment 3]
Next, a processing procedure by the communication service providing system according to the third embodiment will be described with reference to FIGS. FIG. 23 is a sequence diagram illustrating processing (registration processing stage) by the communication service providing system according to the third embodiment. FIG. 24 is a sequence diagram illustrating processing (incoming processing stage) by the communication service providing system according to the third embodiment. FIG. Hereinafter, the registration processing stage and the incoming call processing stage will be described in this order.

[Registration processing stage]
First, mutual authentication processing by “EAP-TLS” is executed between the registration request unit 101 of the receiving terminal 100 and the address assignment unit 201 of the IP gateway device 200 (step S501).

  If the mutual authentication is successful, the address assignment unit 201 receives the user ID (assignment destination identification information) and the MAC address included in the EAP message or certificate transmitted from the registration request unit 101, and receives the user ID and the MAC. The association (record) with the address is stored (registered) in the address assignment state storage unit 202 (step S502). Thereafter, the address assignment unit 201 transmits “EAP-Success” indicating that the authentication is successful to the registration request unit 101 (step S503).

  Subsequently, the registration request unit 101 that has received “EAP-Success” transmits an IP address allocation request including the MAC address of the receiving terminal 100 to the address allocation unit 201 (step S504).

  Then, the address assignment unit 201 that has received the IP address assignment request acquires the MAC address included in the IP address assignment request (step S505), and assigns the IP address (step S506).

  Further, the address allocation unit 201 searches the address allocation state storage unit 202 using the MAC address acquired in step S505 as a search key, acquires a user ID associated with the MAC address (step S507), and step S507. The IP address assigned in step S506 is additionally stored (registered) in the association (record) of the user ID (assignment destination identification information) searched in (step S508). Thus, the address assignment unit 201 stores the association between the IP address and the user ID (assignment destination identification information) in the address assignment state storage unit 202.

  Subsequently, the address assignment unit 201 includes the IP address in the response to the IP address assignment request and returns it to the registration request unit 101 (step S509).

  Subsequently, the registration request unit 101 sends a “DNS Update message” which is a registration request including the host name (communication ID), the user ID (assignment destination identification information), and the IP address received from the address assignment unit 201. And transmitted to the DNS server 500 (step S510).

  The registration reception unit 501 of the DNS server 500 stores the association between the host name (communication ID), user ID (assignment identification information), and IP address received from the registration request unit 101 in the terminal information storage unit 502 (registration). (Step S511).

  Thereafter, the registration receiving unit 501 returns “OK / NG” to the registration request unit 101 (step S512).

[Incoming call processing stage]
First, when the transmitting terminal 400 transmits a “DNS query message” that is a name resolution request in which the host name (communication ID) of the receiving terminal 100 is specified, the signal processing unit 503 of the DNS server 500 issues the name resolution request. Receive (step S601).

  Then, the signal processing unit 503 acquires a host name (communication ID) included in the “DNS query message”, searches the terminal information storage unit 502 using the host name as a search key, and associates the host name with the host name. The assigned user ID (assignment destination identification information) and IP address are acquired (step S602).

  Further, the signal processing unit 503 transmits an allocation destination identification information query using the acquired IP address as a search key to the address validity response unit 203 (step S603). Then, the address validity response unit 203 searches the address assignment state storage unit 202 using the received IP address as a search key, and acquires a user ID (assignment destination identification information) associated with the IP address ( In step S604), the assignment destination identification information is returned to the DNS server 500 (step S605).

  The signal processing unit 503 determines whether or not the user ID (allocation destination identification information) acquired from the terminal information storage unit 502 matches the user ID (allocation destination identification information) received from the address validity response unit 203. Comparison (collation) is performed (step S606).

  If the collation results match, the signal processing unit 503 sends the IP address acquired in step S602 to the calling terminal 400 as a response to the “DNS query message” received from the calling terminal 400 in step S601. Transmit (step S607). Then, the transmitting terminal 400 transmits a signal to the IP address acquired from the DNS server 500, whereby the signal is transmitted to the receiving terminal 100 (step S608). On the other hand, the signal processing unit 503 returns an error to the transmission terminal 400 when the collation result does not match.

[Principle of Communication Service Providing System According to Embodiment 3]
Here, the principle of the communication service providing system according to the third embodiment will be described again with reference to FIG. FIG. 25 is a diagram for explaining the principle of the communication service providing system according to the third embodiment.

  As shown in FIG. 25, in the communication service providing system according to the third embodiment, information is associated in the order of (1) to (13). That is, as shown in (1) of FIG. 25, the registration request unit 101 of the receiving terminal 100 transmits the allocation destination identification information (user ID) to the address allocation unit 201 of the IP gateway device 200, whereby the address allocation unit 201 stores the association between the IP address and the assignment destination identification information (user ID) in the address assignment state storage unit 202 (see (2) in FIG. 25).

  Since the IP address is transmitted to the registration request unit 101 as a response by the address allocation unit 201 (see (3) in FIG. 25), the registration request unit 101 includes the communication ID (host name) and the allocation destination identification information. The association between the (user ID) and the IP address is transmitted to the registration reception unit 501 of the DNS server 500, and the registration reception unit 501 stores the association in the terminal information storage unit 502 (FIG. 25). (See (4) and (5)).

  In this state, as shown in (6) of FIG. 25, when the signal processing unit 503 of the DNS server 500 receives the name resolution request specifying the communication ID (host name), the signal processing unit 503 The terminal information storage unit 502 is searched using the communication ID (host name) thus made as a search key (see (7) in FIG. 25), and the assigned identification information (user ID) and the IP address associated with each other are searched. Obtain (see (8) in FIG. 25).

  Then, the signal processing unit 503 makes an inquiry about the allocation destination identification information to the address validity response unit 203 of the IP gateway device 200 using the IP address acquired by the search as a search key (see (9) in FIG. 25). ). Then, the address validity response unit 203 searches the address assignment state storage unit 202 using the IP address as a search key (see (10) in FIG. 25), and assigns the associated destination identification information (user ID). Obtain (see (11) of FIG. 25).

  Subsequently, when the address validity response unit 203 transmits the acquired assignment destination identification information (user ID) as a response to the signal processing unit 503 (see (12) in FIG. 25), the signal processing unit 503 receives the terminal information. Whether the allocation destination identification information (user ID) acquired from the storage unit 502 matches the allocation destination identification information (user ID) acquired from the address validity response unit 203 (see (8) in FIG. 25). Are compared, and if they match, the signal is transferred (see (13) in FIG. 25).

  In the communication service providing system according to the third embodiment, by associating information as described above, the “association registered in the DNS server 500” and the “association currently assigned to the receiving terminal 100” can be accurately performed. While avoiding the inconvenience caused by not synchronizing, it is possible to provide a DNS service and realize IP communication.

[Effect of Example 3]
As described above, according to the third embodiment, the combination of the IP address and user ID registered in the DNS server when the name resolution request is received, and the IP registered in the IP gateway device when connected to the network. By matching the combination of the address and the user ID and not matching, it is possible to prevent erroneous incoming calls by not responding to the name resolution request.

  That is, according to the conventional method, the IP address corresponding to the host name managed by the DNS server when the user using the receiving terminal or the moving of the receiving terminal or the disconnection of the network is disconnected, and the receiving terminal actually There is a possibility that the IP address assigned to the IP address is deviated, and in such a case, an unintended communication partner may be received. However, according to the communication service providing system according to the third embodiment, when the correspondence between the host name registered in the DNS server and the IP address is different from the actual situation, an error is transmitted. It can prevent false incoming calls and information leakage.

[Other embodiments]
Although the embodiments of the present invention have been described so far, the present invention may be implemented in various different forms other than the embodiments described above.

[System configuration, etc.]
In addition, among the processes described in this embodiment, all or a part of the processes described as being automatically performed can be manually performed, or the processes described as being manually performed can be performed. All or a part can be automatically performed by a known method. In addition, the processing procedure, control procedure, specific name, and information including various data and parameters shown in the above-described document and drawings can be arbitrarily changed unless otherwise specified.

  Further, each component of each illustrated apparatus is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each device is not limited to that shown in the figure, and all or a part thereof may be functionally or physically distributed or arbitrarily distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured. Further, all or any part of each processing function performed in each device may be realized by a CPU and a program analyzed and executed by the CPU, or may be realized as hardware by wired logic.

  The communication service providing method described in this embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. This program can be distributed via a network such as the Internet. The program can also be executed by being recorded on a computer-readable recording medium such as a hard disk, a flexible disk (FD), a CD-ROM, an MO, and a DVD and being read from the recording medium by the computer.

  As described above, in the communication service providing system, the address assignment device, and the signal processing device according to the present invention, the signal processing device uniquely identifies the user who uses the receiving terminal or the ID that uniquely identifies the receiving terminal. Is received, it is useful for processing the signal using the address assigned to the receiving terminal by the address assigning device. In particular, communication to the receiving terminal arrives at the intended receiving terminal. Suitable for guaranteeing that.

It is a figure for demonstrating the outline | summary and characteristic of the communication service provision system (registration stage) which concern on Example 1. FIG. It is a figure for demonstrating the outline | summary and characteristic of the communication service provision system (incoming call process stage) which concern on Example 1. FIG. 1 is a block diagram illustrating a configuration of a communication service providing system according to a first embodiment. It is a figure for demonstrating an address allocation state memory | storage part. It is a figure for demonstrating the synchronization of matching. It is a figure for demonstrating a terminal information storage part. It is a sequence diagram which shows the process (registration process stage) by the communication service provision system which concerns on Example 1. FIG. It is a sequence diagram which shows the process (incoming call process stage) by the communication service provision system which concerns on Example 1. FIG. 1 is a diagram for explaining the principle of a communication service providing system according to a first embodiment. It is a figure for demonstrating the example applied to B2BUA. It is a figure for demonstrating the outline | summary and characteristic of the communication service provision system (registration stage) which concern on Example 2. FIG. It is a figure for demonstrating the outline | summary and the characteristic of the communication service provision system (incoming call process stage) which concern on Example 2. FIG. It is a figure for demonstrating an address allocation state memory | storage part. It is a figure for demonstrating a terminal information storage part. It is a sequence diagram which shows the process (registration process stage) by the communication service provision system which concerns on Example 2. FIG. FIG. 10 is a sequence diagram illustrating processing (incoming call processing stage) by the communication service providing system according to the second embodiment. It is a figure for demonstrating the principle of the communication service provision system which concerns on Example 2. FIG. It is a figure for demonstrating the outline | summary and characteristic of the communication service provision system (registration stage) which concern on Example 3. FIG. It is a figure for demonstrating the outline | summary and the characteristics of the communication service provision system (incoming call process stage) which concern on Example 3. FIG. It is a block diagram which shows the structure of the communication service provision system which concerns on Example 3. FIG. It is a figure for demonstrating an address allocation state memory | storage part. It is a figure for demonstrating a terminal information storage part. It is a sequence diagram which shows the process (registration process stage) by the communication service provision system which concerns on Example 3. FIG. FIG. 10 is a sequence diagram illustrating processing (incoming call processing stage) by the communication service providing system according to the third embodiment. FIG. 10 is a diagram for explaining the principle of a communication service providing system according to a third embodiment.

Explanation of symbols

10 L2SW
DESCRIPTION OF SYMBOLS 20 Network 100 Incoming terminal 101 Registration request part 102 Signal receiving part 110 Communication part 200 IP gateway apparatus 201 Address assignment part 202 Address assignment state memory | storage part 203 Address validity response part 210 Communication part 300 SIP server 301 Registration reception part 302 Terminal information storage Unit 303 signal processing unit 310 communication unit 400 transmission terminal 500 DNS server 501 registration reception unit 502 terminal information storage unit 503 signal processing unit 510 communication unit

Claims (5)

A signal processing device that processes a signal transmitted from a transmitting terminal of a user who uses a communication service provided on a network, and an address assignment device that assigns an address used for the communication service to each receiving terminal; When the signal processing device receives an ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal, the address assigned to the receiving terminal by the address assigning device A communication service providing system for processing the signal using
The address allocation device includes:
An assignment unit that accepts assignment destination information that uniquely identifies a receiving terminal and receives an assignment request that requests assignment of an address from the receiving terminal, assigning an address and responding the address to the receiving terminal;
When an address is assigned to the receiving terminal by the assigning means, an assignment storage means for storing a correspondence between the address and the assignment destination information in an assignment storage means;
When an assignment destination information inquiry for inquiring assignment destination information of a receiving terminal that is currently assigned by designating an address is received from the signal processing device, the assignment storage means is searched using the address as a search key, and the address Responding means for acquiring allocation destination information associated with the information processing apparatus and responding to the signal processing apparatus with the allocation destination information.
The signal processing device includes:
From the receiving terminal assigned the address by the assigning means of the address allocating device, the ID of the user who uses the receiving terminal or the ID of the receiving terminal, the allocation destination information of the receiving terminal, and the allocation to the receiving terminal A storage unit that stores the association in the terminal information storage unit upon receipt of a storage request for storing the association with the designated address;
A first acquisition unit configured to search the terminal information storage unit by using the ID as a search key and to acquire allocation destination information and an address associated with the ID when a signal with an ID specified is received from the transmission terminal; ,
When the allocation information and the address are acquired by the first acquisition means, the address information inquiry using the address as a search key is transmitted to the address allocation device, and the response means responds to the address. Second acquisition means for acquiring allocation destination information associated with
Whether the assignment destination information acquired by the first acquisition means matches the assignment destination information acquired by the second acquisition means when the assignment destination information is acquired by the second acquisition means Signal processing means for processing the signal using the address acquired by the first acquisition means when they match,
A communication service providing system comprising: A signal processing device that processes a signal transmitted from a transmitting terminal of a user who uses a communication service provided on a network, and an address assignment device that assigns an address used for the communication service to each receiving terminal; When the signal processing device receives an ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal, the address assigned to the receiving terminal by the address assigning device The address allocation device in a communication service providing system that processes the signal using
An assignment unit that accepts assignment destination information that uniquely identifies a receiving terminal and receives an assignment request that requests assignment of an address from the receiving terminal, assigning an address and responding the address to the receiving terminal;
When an address is assigned to the receiving terminal by the assigning means, an assignment storage means for storing a correspondence between the address and the assignment destination information in an assignment storage means;
When an assignment destination information inquiry for designating an address and inquiring about assignment destination information of a receiving terminal that is currently assigned the address is received from the signal processing device, it is stored in the signal processing device by a storage request received from the receiving terminal. Whether or not the allocation destination information and the allocation destination information acquired by the signal processing device in response to the response from the address allocation device match is compared in the signal processing device. So that the signal is processed, the allocation storage means is searched using the address as a search key, the allocation destination information associated with the address is acquired, and the allocation destination information is returned to the signal processing device. A response means to
An address assignment device comprising: A signal processing device that processes a signal transmitted from a transmitting terminal of a user who uses a communication service provided on a network, and an address assignment device that assigns an address used for the communication service to each receiving terminal; When the signal processing device receives an ID that uniquely identifies a user who uses the receiving terminal or an ID that uniquely identifies the receiving terminal, the address assigned to the receiving terminal by the address assigning device The signal processing apparatus in a communication service providing system that processes the signal using
From the receiving terminal assigned the address by the address assigning device, the ID of the user who uses the receiving terminal or the ID of the receiving terminal, the assignment destination information of the receiving terminal, and the address assigned to the receiving terminal A storage unit that stores the association in the terminal information storage unit when receiving a storage request for storing the association with
A first acquisition unit configured to search the terminal information storage unit by using the ID as a search key and to acquire allocation destination information and an address associated with the ID when a signal with an ID specified is received from the transmission terminal; ,
When the allocation information and the address are acquired by the first acquisition means, an allocation information inquiry for inquiring allocation address information of the receiving terminal that is currently allocated the address using the address as a search key is sent to the address allocation device. A second acquisition means for transmitting and acquiring the allocation destination information associated with the address by responding from the address allocation device;
Whether the assignment destination information acquired by the first acquisition means matches the assignment destination information acquired by the second acquisition means when the assignment destination information is acquired by the second acquisition means Signal processing means for processing the signal using the address acquired by the first acquisition means when they match,
A signal processing apparatus comprising: A signal processing device that processes a signal transmitted from a transmission terminal of a user who uses a communication service provided on a network, and an address assignment device that assigns an address used for the communication service to each receiving terminal In the communication service providing system, when the signal processing device receives a signal in which an ID for uniquely identifying a user who uses the receiving terminal or an ID for uniquely identifying the receiving terminal is specified, the incoming call is received by the address assignment device. A communication service providing method for processing the signal using an address assigned to a terminal,
The address allocation device includes:
An assignment step for accepting assignment destination information for uniquely identifying a receiving terminal and accepting an assignment request for assigning an address from the receiving terminal; assigning an address and responding the address to the receiving terminal;
When an address is assigned to the receiving terminal by the assignment step, an assignment storage step of storing a correspondence between the address and the assignment destination information in an assignment storage unit;
When an assignment destination information inquiry for inquiring assignment destination information of a receiving terminal that is currently assigned by designating an address is received from the signal processing device, the assignment storage unit is searched using the address as a search key, and the address A response step of acquiring allocation destination information associated with the information processing apparatus and responding to the signal processing device with the allocation destination information.
The signal processing device includes:
From the receiving terminal that has been assigned an address in the assigning step of the address assigning device, the ID of the user who uses the receiving terminal or the ID of the receiving terminal, the allocation destination information of the receiving terminal, and the allocation to the receiving terminal A storage step of storing the association in the terminal information storage unit upon receiving a storage request for requesting to store the association with the given address;
A first acquisition step of searching the terminal information storage unit using the ID as a search key and acquiring the allocation destination information and the address associated with the ID when receiving a signal in which the ID is specified from the transmission terminal; ,
When allocation destination information and an address are acquired by the first acquisition step, the allocation destination information inquiry using the address as a search key is transmitted to the address allocation device, and the address is obtained by responding to the response step. A second acquisition step of acquiring allocation destination information associated with
When the allocation destination information is acquired by the second acquisition step, whether the allocation destination information acquired by the first acquisition step matches the allocation destination information acquired by the second acquisition step A signal processing step of processing the signal using the address acquired by the first acquisition step when they match, and
A communication service providing method comprising: A signal processing device that processes a signal transmitted from a transmission terminal of a user who uses a communication service provided on a network, and an address assignment device that assigns an address used for the communication service to each receiving terminal In the communication service providing system, when the signal processing device receives a signal in which an ID for uniquely identifying a user who uses the receiving terminal or an ID for uniquely identifying the receiving terminal is specified, the incoming call is received by the address assignment device. A communication service providing program for causing a computer to execute a communication service providing method for processing the signal using an address assigned to a terminal,
An assignment procedure for assigning an address and responding the address to the destination terminal when accepting an assignment request for assigning an address from the destination terminal while accepting assignment destination information for uniquely identifying the destination terminal;
When an address is assigned to the receiving terminal by the assignment procedure, an assignment storage procedure for storing a correspondence between the address and the assignment destination information in an assignment storage unit;
When an assignment destination information inquiry for inquiring assignment destination information of a receiving terminal that is currently assigned by designating an address is received from the signal processing device, the assignment storage unit is searched using the address as a search key, and the address And a response procedure for responding to the signal processing device with the assignment destination information obtained by assigning the assignment destination information associated with the address assignment device.
From the receiving terminal that has been assigned an address according to the allocation procedure of the address allocating device, the ID of the user who uses the receiving terminal or the ID of the receiving terminal, the allocation destination information of the receiving terminal, and the allocation to the receiving terminal A storage procedure for storing the association in the terminal information storage unit upon receipt of a storage request for storing the association with the designated address;
A first acquisition procedure for receiving a signal with an ID specified from a transmitting terminal, searching the terminal information storage unit using the ID as a search key, and acquiring allocation destination information and an address associated with the ID; ,
When allocation destination information and an address are acquired by the first acquisition procedure, the allocation destination information inquiry using the address as a search key is transmitted to the address allocation device, and the address is obtained by responding to the response procedure. A second acquisition procedure for acquiring allocation destination information associated with
Whether the allocation destination information acquired by the first acquisition procedure matches the allocation destination information acquired by the second acquisition procedure when the allocation destination information is acquired by the second acquisition procedure A signal processing procedure for processing the signal using the address acquired by the first acquisition procedure when they match,
Is executed by a computer as the signal processing apparatus.

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