JP4456428B2 - Call connection management device, gatekeeper device, and Centrex gateway device - Google Patents

Description

  The present invention relates to a call connection management device, a gatekeeper device, and a Centrex gateway device, and more particularly to a call connection management device, a gatekeeper device, and a Centrex gateway device that manage a call connection between an IP terminal and a PSTN terminal having a specific telephone number.

  Recently, IP Centrex has been attracting attention as an IP telephone service provided by carriers to companies. This IP Centrex provides a company with an environment in which an IP telephone can be used by a communication carrier using a shared IP-PBX by an outsourcing service.

  By introducing IP Centrex, companies do not need to install IP-PBX in their companies, extend between remote branch offices, and charge flat rates for calls to fixed telephones connected to the public line network. The management cost and the communication cost associated with the introduction of the IP telephone system are reduced.

  However, when an IP telephone system is introduced, there is a restriction that a call cannot be made from an IP telephone to a PSTN telephone having a specific telephone number (hereinafter referred to as a specific number) via a public network. The specific number includes, for example, the “110” number of the police who is the emergency call destination and the “119” number of the fire department. The reason why it is not possible to make a call to these specific numbers is that the location of the caller cannot be specified, and the call cannot be connected to the PSTN gateway of the nearest jurisdiction.

Therefore, for example, there is an IP telephone system described in Patent Document 1 as a means for realizing an emergency call from an IP telephone to "110" or "119". In this IP telephone system, the IP telephone sends call setting information including emergency call setting information including information indicating the location and user of the terminal to the inter-network relay switching apparatus via the IP network, The inter-network relay exchange apparatus stores and holds emergency call setting information included in the call setting information, and connects a communication path between the IP phone and the emergency call destination. When the communication path in the IP network is cut off during an emergency call between the emergency call destination and the IP phone due to an overload or the like, the inter-network relay exchange device stores the stored emergency call. The setting information is converted into voice and sent to the emergency call destination via the public telephone network to ensure that the necessary information reaches the emergency call destination.
JP 2004-120715 A

  However, the IP telephone system described in Patent Document 1 includes an IP phone having a function of setting emergency call setting information as call setting information, a function of storing emergency call setting information, and emergency call setting information. An inter-network relay switching device that has a function to convert to voice is required, and a special equipment configuration is required for an IP telephone system that realizes an emergency call to a specific number, which increases the cost when a company introduces the system To do.

  For this reason, it is difficult to apply the IP telephone system described in Patent Document 1 to the above IP Centrex or the like, and making a call to a specific number while taking advantage of the cost merit that is characteristic of IP telephone services such as IP Centrex. An IP telephone system that also realizes this is desired.

  Also, if the source IP phone is a mobile terminal such as a PHS (Personal Handyphone System) terminal, the mobile terminal moves to multiple locations, so the location of the source mobile terminal is specified and the specific number is managed It is even more difficult to connect a call to a telephone network. This cannot be realized even by the IP telephone system described in Patent Document 1.

  The present invention has been made in view of such a point, and when the telephone number of the PSTN terminal requested for call connection from the IP terminal is a specific telephone number, the subnet is calculated from the IP address of the base to which the IP terminal is connected. A call connection management device, a gatekeeper device and a Centrex gateway device for determining a PSTN gateway to which a call is to be connected using this subnet and enabling a call connection between an IP terminal and a PSTN terminal having a specific telephone number The purpose is to provide.

  The present invention is a call connection management apparatus for connecting a call in response to a call connection request from an IP terminal connected to an IP network to a PSTN terminal connected to a public network, and a specific number for setting a specific telephone number Setting means; subnet setting means for setting the subnet information of the base to which the IP terminal is connected and the IP address information of the PSTN gateway device installed at the base to which the IP terminal is connected; and the call connection Specific number determination means for determining whether the destination telephone number transmitted from the IP terminal at the time of the request is a specific telephone number set in the specific number setting means; and the destination telephone number is a specific telephone number If there is, the IP of the PSTN gateway device that calculates the subnet from the IP address of the base to which the IP terminal is connected and connects the call based on the subnet It is obtained so as to comprise a call connection destination determining means for determining the address from the subnet setting means.

  When the telephone number of the PSTN terminal requested for call connection from the IP terminal is a specific telephone number, the call connection management apparatus according to the present invention uses the IP address of the PHS gateway apparatus installed at the destination site to which the IP terminal has moved. A subnet is calculated, a PSTN gateway to which a call is to be connected is determined using this subnet, and a call connection between an IP terminal and a PSTN terminal having a specific telephone number is enabled.

  A call connection management apparatus according to a first aspect of the present invention is a call connection management apparatus that connects a call in response to a call connection request from an IP terminal connected to an IP network to a PSTN terminal connected to a public network. The specific number setting means for setting a specific telephone number is associated with the subnet information of the base to which the IP terminal is connected and the IP address information of the PSTN gateway apparatus installed at the base to which the IP terminal is connected. Subnet setting means for setting, a specific number determination means for determining whether or not the destination telephone number transmitted from the IP terminal at the time of the call connection request is a specific telephone number set in the specific number setting means, When the destination telephone number is a specific telephone number, a subnet is calculated from the IP address of the base to which the IP terminal is connected, and a call is connected based on the subnet. The IP address of the PSTN gateway apparatus employs a configuration having a, a call connection destination determining means for determining from said subnet setting means.

  According to this configuration, when the telephone number of the PSTN terminal requested for call connection from the IP terminal is a specific telephone number, the subnet is calculated from the IP address of the gateway device installed at the base to which the IP terminal is connected. A PSTN gateway to which a call is to be connected is determined using a subnet, and a call connection between an IP terminal and a PSTN terminal having a specific telephone number becomes possible.

  A gatekeeper device according to a second aspect of the present invention is a gatekeeper device that connects a call in response to a call connection request from an IP terminal connected to an IP network to a PSTN terminal connected to a public network. Specific number setting means for setting a telephone number, subnet information for the base to which the IP terminal is connected, and subnet for setting the IP address information of the PSTN gateway device installed at the base to which the IP terminal is connected in association with each other Setting means; specific number determination means for determining whether the destination telephone number transmitted from the IP terminal at the time of the call connection request is a specific telephone number set in the specific number setting means; and When the telephone number is a specific telephone number, a subnet is calculated from the IP address of the IP terminal, and a PSTN gate that connects a call based on the subnet. The IP address of the way device employs a configuration having a, a call connection destination determining means for determining from said subnet setting means.

  According to this configuration, when the telephone number of the PSTN terminal requested for call connection from the IP terminal is a specific telephone number, the subnet is determined from the IP address of the gateway device installed at the base in the IP network to which the IP terminal is connected. By calculating and determining a PSTN gateway installed at a base in the public network to which a call is to be connected using this subnet, a call connection between the IP terminal and the PSTN terminal having a specific telephone number becomes possible. .

  According to a third aspect of the present invention, in the gatekeeper device according to the second aspect, the IP terminal is a mobile terminal that moves between a plurality of bases in which PHS gateway devices that accommodate radio base stations are installed, and the call connection When the destination telephone number is a specific telephone number, the destination determination means calculates a subnet from the IP address of the PHS gateway device at the base where the IP terminal has moved, and connects the call based on the subnet. A configuration is adopted in which the IP address of the apparatus is determined from the subnet setting means.

  According to this configuration, even when a call connection request is made from an IP terminal to a PSTN terminal having a specific telephone number at a destination site, the subnet is calculated from the IP address of the gateway device installed at the destination site. A PSTN gateway installed at a base in a public line network to which a call is to be connected is determined using a subnet, and a call connection between an IP terminal and a PSTN terminal having a specific telephone number becomes possible.

  According to a fourth aspect of the present invention, in the gatekeeper device according to the second aspect, the call connection destination determining unit is configured to provide a PSTN gateway device in the home base of the IP terminal when the destination telephone number is not a specific telephone number. Is determined as the call destination.

  According to this configuration, even when a call connection request is made from an IP terminal to a PSTN terminal that is not a specific telephone number at a destination site, a call connection between the IP terminal and a PSTN terminal that is not a specific telephone number is possible.

  According to a fifth aspect of the present invention, in the gatekeeper according to the second aspect, a Centrex gateway device connected to an IP Centrex network is installed at a base to which the IP terminal is connected, and the call connection destination determining means includes: When the destination telephone number is not a specific telephone number, the IP address of the Centrex gateway device is determined as a call connection destination.

  According to this configuration, when a call connection request is made from an IP terminal to a PSTN terminal that is not a specific telephone number, a call is connected to the PSTN terminal at the base in the public line network via the IP Centrex network. Thus, communication costs can be reduced using the IP Centrex network.

  The Centrex gateway device according to the sixth aspect of the present invention connects a call in response to a call connection request from an IP terminal connected to the IP network to a PSTN terminal connected to the public network, and is connected to the IP Centrex network. A specific number setting means for setting a specific telephone number; subnet information of a base to which the IP terminal is connected; and an IP of a PSTN gateway apparatus installed at the base to which the IP terminal is connected. Subnet setting means for associating and setting address information, and determining whether the destination telephone number transmitted from the IP terminal at the time of the call connection request is a specific telephone number set in the specific number setting means If the specific number discrimination means and the destination telephone number are specific telephone numbers, the IP address of the IP terminal Calculating a subnet, a configuration that includes a call destination determination means for determining the IP address of the PSTN gateway device from the subnet setting means for connecting the call, the based on the subnet.

  According to this configuration, when the telephone number of the PSTN terminal requested for call connection from the IP terminal is a specific telephone number, the subnet is determined from the IP address of the gateway device installed at the base in the IP network to which the IP terminal is connected. By calculating and determining a PSTN gateway installed at a base in the public network to which a call is to be connected using this subnet, a call connection between the IP terminal and the PSTN terminal having a specific telephone number becomes possible. .

According to a seventh aspect of the present invention, in the Centrex gateway device according to the sixth aspect, when the destination telephone number is not a specific telephone number, the call destination determination unit uses the telephone number as the destination of the call. And a connection is made to the PSTN network via the IP Centrex network, and a call is connected to the PSTN terminal having the telephone number via the PSTN network .

  According to this configuration, when a call connection request is made from an IP terminal to a PSTN terminal that is not a specific telephone number, a call is connected to the PSTN terminal at the base in the public line network via the IP Centrex network. Thus, communication costs can be reduced using the IP Centrex network.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an overall configuration of an IP telephone system according to an embodiment of the present invention. In FIG. 1, in an IP telephone system, for example, a base A in Yokohama and a base B in Osaka are connected to each other via a WAN (Wide Area Network) 10 and a public line network 20.

  A gatekeeper 100, a PHS gateway (PHS-GW) 200, and a PSTN gateway (PSTN-GW) 300 are connected to the base A via a network L1. In addition, two base stations 210 and 220 are connected to the PHS gateway 200, and the public line network 20 is connected to the PSTN gateway 300. It is assumed that a PHS terminal 700 having an IP telephone function exists at the site A.

  It is assumed that the user of the PHS terminal 700 usually moves mainly in the calling area of the base A, and the base A is the home calling area for the PHS terminal 700. Therefore, the base A is the home base A of the PHS terminal 700, and the base B is the destination base B for the PHS terminal 700.

  A gatekeeper 400, a PSTN gateway (PSTN-GW) 500, and a PHS gateway (PHS-GW) 600 are connected to the destination base B via a network L2. In addition, two base stations 610 and 620 are connected to the PHS gateway 600, and the public network 20 is connected to the PSTN gateway 500.

The home base A and the destination base B are remote communication areas such as Yokohama and Osaka. In FIG. 1, the PHS terminal 700 is present at the home base A and the PHS terminal 700 is present at the destination base B. The case where it moved is shown.

  In addition, the public telephone network 20 includes a message area (MA1) of 045, which is the area code of Yokohama, and a message area (MA2) of 06, which is the area code of Osaka. It is assumed that a terminal having a specific telephone number such as “110” is installed.

  The gatekeeper 100 (400) includes a subnet table 1031 (to be described later) that stores the subnet of the PHS gateway 200 (600) and the IP address of the PSTN gateway 300 (500) in association with each other, and a specific number table 1032 (to be described later) that stores a specific number. Is provided. The gatekeeper 100 (400) receives the destination dial information and the IP address from the PHS gateway 200 (600), calculates the subnet of the PHS gateway 200 (600) from the IP address, and calls based on the subnet. For example, a function of determining the IP address of the PSTN gateway 300 (500) to be connected from the subnet table 1031 and returning it to the PHS gateway 200 (600).

  The PHS gateway 200 (600) accommodates base stations 210 (610) and 220 (620) installed in the home base A (destination base B), and includes the gatekeeper 100 (400) and the PSTN gateway 300 (500). H. 323 messages or SIP (Session Initiation Protocol) messages are exchanged, and wireless communication messages are exchanged with the PHS terminals 700 existing in the wireless communication areas of the base stations 210 (610) and 220 (620). Communication control related to outgoing / incoming calls and calls via the WAN 10 or the public network 20 of the terminal 700 is performed.

  Base stations 210 (610) and 220 (620) establish wireless communication with PHS terminal 700 to enable communication between PHS terminal 700 and PHS gateway 200 (600).

  The PHS terminal 700 is a telephone terminal having a telephone number (E.164 address), communicates with the PHS gateway 200 (600) via the base stations 210 (610) and 220 (620), and others via the WAN 10. PHS terminals and H.P. It communicates with H.323 terminals. The PHS terminal 700 also has a mobile phone number, communicates with the PHS gateway 200 (600) via the base stations 210 (610) and 220 (620), and communicates with other PSTN terminals via the public line network 20. Communicate with. The PHS terminal 700 functions as an IP terminal.

  A PSTN (Public Switched Telephone Networks) gateway 300 (500) is connected to the PHS gateway 200 (600) by an H.264 related to call control. 323 messages or SIP messages are exchanged, wireless communication messages are exchanged with the PHS terminals 700 existing in the respective radio communication areas of the base stations 210 (610) and 220 (620), and the WAN 10 of the PHS terminal 700 or Communication control related to outgoing / incoming calls and calls via the public line network 20 is performed.

  FIG. 2 is a block diagram showing a configuration of the gatekeeper 100 according to the present embodiment. Note that the gatekeeper 400 has the same configuration as the gatekeeper 100.

  In FIG. 2, the gatekeeper 100 is mainly configured by a CPU 101, a call connection control unit 102, a memory 103, and a TCP / IP control unit 104.

  A CPU (Central Processing Unit) 101 controls the entire gatekeeper 100 based on a control program stored in a built-in ROM (Read Only Memory) (not shown). Further, the CPU 101, for example, calculates the subnet of the PHS gateway 200 based on the IP address received from the PHS gateway 200 by the TCP / IP control unit 104, and the IP address of the connection destination PSTN gateway corresponding to the subnet. Is executed from the subnet table 1031 stored in the memory 103 and output to the call connection control unit 102. The CPU 101 functions as a specific number determination unit and a call connection destination determination unit.

  The call connection control unit 102 stores a call control program and executes a call connection control process with the PHS gateway 200 based on the call connection control program. For example, when the IP address of the PSTN gateway 300 is input from the CPU 101, the call connection control unit 102 executes a call connection control process for the IP address with the PHS gateway 200.

  The memory 103 stores a subnet table 1031 shown in FIG. 3 and a specific number table 1032 shown in FIG. The subnet table 1031 in FIG. 3 stores the subnet of the IP address assigned to the PHS gateway 200 existing at the site A and the IP address assigned to the PSTN gateway 300 existing at the same site A in association with each other. . In this case, “192.168.1.0”, “192.168.2.0”, “192.168.3.0” as subnets, and “192.168.1.” As the IP address of the PSTN gateway 300. .10 ”,“ 192.168.1.11 ”, and“ 192.168.1.11 ”are stored. The memory 103 also stores a subnet mask for calculating a subnet from the IP address of the PHS gateway 200. The subnet table 1031 functions as a subnet setting unit.

  In the specific number table 1032 of FIG. 4, “110” and “119” are stored as specific numbers. In addition to these numbers, for example, specific numbers such as “0120” and “0550” exist, but are omitted in this embodiment. The specific number table 1032 functions as specific number setting means.

  The TCP / IP control unit 104 stores a TCP / IP control program. A message converted into the H.323 protocol or the SIP protocol is transmitted to and received from the PHS gateway 200.

  Therefore, the gatekeeper 100 (400) of the present embodiment functions as a call connection management device and a gatekeeper device.

  Next, processing of the gatekeeper 400 corresponding to a call from the PHS terminal 700 moved to the movement destination base B will be described with reference to a flowchart shown in FIG. Note that the gatekeeper 100 also executes the processing of FIG.

  In step S501 of FIG. 5, the gatekeeper 400 detects a call from the PHS gateway 600 in the movement destination base B. At this time, the gatekeeper 400 receives the destination dial information and the IP address of the PHS gateway 600 from the PHS gateway 600 by the TCP / IP control unit 104.

  Next, the CPU 101 of the gatekeeper 400 refers to the specific number table 1032 in FIG. 4 to determine whether or not the received destination dial information matches the specific number (step S502). When it is determined that the received destination dial information matches the specific number (step S502: YES), the process proceeds to step S503.

  In step S 503, the CPU 101 calculates the subnet of the PHS gateway 600 based on the IP address of the PHS gateway 600 received in step S 501 and the subnet mask stored in the memory 103. Next, the CPU 101 refers to the subnet table 1031 in FIG. 3 and determines the IP address of the connection destination PSTN gateway corresponding to the calculated subnet (step S504).

  With the above processing, when the PHS terminal 700 calls a specific number at the destination base B, the PSTN gateway 500 to be connected to the specific number from the subnet of the PHS gateway 600 connected to the destination base B is It is determined.

  Next, in the CPU 101, the TCP / IP control unit 104 sends the outgoing message including the destination dial information received in step S501 to the destination PSTN terminal in the public line network 20 via the PSTN gateway 500 (step S505). ), This process is terminated.

  In step S502, if the CPU 101 determines that the received destination dial information does not match the specific number (step S502: NO), the CPU 101 proceeds to step S506 and sends the destination to the PSTN gateway 300 at the home base A. The TCP / IP control unit 104 sends out the outgoing message including the dial information and the IP address of the PHS gateway 600 via the PSTN gateway 300, and the process ends.

  Next, in the IP telephone system having the above configuration and functions, A specific operation when the H.323 protocol is used will be described with reference to the sequence diagram shown in FIG. In this case, an operation when the PHS terminal 700 that has moved from the home base A to the destination base B calls the specific number “110” will be described.

  In FIG. 6, when the PHS gateway 600 receives a SETUP (call setting) message in which the dial information (110) of the destination is set from the PHS terminal 700 (step S601), the dial information of the source PHS terminal 700, An ARQ (Admission Request) message in which the destination dial information and the IP address of the PHS gateway 600 are set is sent to the gatekeeper 400 (step S602).

  Next, the gatekeeper 400 determines whether the destination dial information received by the processing shown in FIG. 5 is a specific number. In this case, since it is 110, it is determined as the specific number, and the IP address of the PHS gateway 600 is determined. The subnet is calculated, and the IP address of the PSTN gateway (in this case, the PSTN gateway 500 at the destination base B) is determined from this subnet (step S603).

  By this processing, when the PHS terminal 700 calls a specific number (110) at the destination base B, the connection is made from the subnet of the PHS gateway 600 connected to the destination base B to the specific destination number. The PSTN gateway 500 to be determined is determined.

  Next, the gatekeeper 400 returns an ACF (Admisson Confirm) message in which the IP address of the PSTN gateway 500 is set to the PHS gateway 600 (step S604). Next, when receiving an ACF (authorization confirmation) message from the gatekeeper 400, the PHS gateway 600 returns a CALL PROC (CALL PROCEEDING) message to the PHS terminal 700 (step S605).

  Next, the PHS gateway 600 sends a SETUP (call setting) message in which dial information of the destination PSTN terminal is set to the IP address of the PSTN gateway 500 received from the gatekeeper 400 (step S606). Next, the PSTN gateway 500 sends the SETUP (call setting) message received from the PHS gateway 600 to the public line network 20 accommodating the specific number terminal (step S607).

  Next, the PSTN gateway 500 receives a CALL PROC (call setting acceptance) message, which is a response to the SETUP (call setting) message, from the public line network 20 (step S608).

  Next, when the PSTN gateway 500 receives the CALL PROC (call setting acceptance) message, the PSTN gateway 500 then sends the CALL PROC (call setting acceptance) message received from the public network 20 to the destination PHS gateway 600. (Step S609).

  When the destination PSTN terminal rings a ring tone and informs the user of the incoming call, an ALERT (calling) message is sent from the public network 20 to the PSTN gateway 500 (step S610). Next, when receiving the ALERT (calling) message, the PSTN gateway 500 sends the ALERT (calling) message to the PHS gateway 600 (step S611). Next, when receiving the ALERT (calling) message from the PSTN gateway 500, the PHS gateway 600 sends the ALERT (calling) message to the PHS terminal 700 (step S612). The PHS terminal 700 receives the ALERT (calling) message from the PHS gateway 600 to confirm that the called party is calling.

  Next, when the destination PSTN terminal is off-hooked by the user, a CONN (connection) message is sent from the public network 20 to the PSTN gateway 500 (step S613). Next, the PSTN gateway 500 sends the CONN (connection) message received from the destination PSTN terminal to the PHS gateway 600 (step S614).

  Next, when receiving the CONN (connection) message from the PSTN gateway 500, the PHS gateway 600 sends the CONN (connection) message to the PHS terminal 700 (step S615). Thereafter, the PHS terminal 700 starts a call with the destination PSTN terminal.

  As described above, when the PHS terminal 700 makes a call to the PSTN terminal having a specific number at the movement destination base B, the gatekeeper 400 of the movement destination base B receives the IP address of the PHS gateway 600 that accepts the call from the PHS terminal 700. When the 110th report is sent from the PHS terminal that has moved from Yokohama to Osaka to determine the PSTN gateway of the destination base B from this subnet, a call is made to the Yokohama police (110) You can make a call to the nearest Osaka police (110).

  Next, a specific operation when the SIP protocol is used will be described with reference to the sequence diagram shown in FIG. In this case, an operation when the PHS terminal 700 moved from the home base A to the destination base B calls the specific number will be described.

  In FIG. 7, when the PHS gateway 600 receives a SETUP (call setting) message in which the dial information of the destination is set from the PHS terminal 700 (step S701), the dial information and the destination dial information of the source PHS terminal 700 are received. The INVITE message in which the IP address of the PHS gateway 600 is set is sent to the gatekeeper 400 (step S702).

  Next, when the gatekeeper 400 receives the INVITE message from the PHS gateway 600, the gatekeeper 400 returns a 100 Trying (during trial) message to the PHS gateway 600 (step S703). When the PHS gateway 600 receives a 100 Trying (trial) message from the gatekeeper 400, the PHS gateway 600 returns a CALL PROC (call setting acceptance) message to the PHS terminal 700 (step S704).

  Next, the gatekeeper 400 determines whether the destination dial information received by the processing shown in FIG. 5 is a specific number, and if it is the specific number, calculates the subnet from the IP address of the PHS gateway 600, and To determine the IP address of the destination PSTN gateway to be connected (for example, the PSTN gateway installed at the base C in FIG. 1) (step S705).

  With this process, when the PHS terminal 700 calls a specific number at the destination base B, the PSTN gateway to be connected to the destination specific number from the subnet of the PHS gateway 600 connected to the destination base B (In this case, the PSTN gateway 500 of the destination base B is determined).

  Next, the gatekeeper 400 sends an INVITE message in which the dial information of the destination PSTN terminal is set to the PSTN gateway 500 (step S706). When the PSTN gateway 500 receives the INVITE message from the gatekeeper 400, the PSTN gateway 500 extracts dial information from the INVITE message and sends a SETUP (call setting) message in which the dial information is set to the public line network 20 that accommodates the specific number terminal ( Step S707).

  Next, when the PSTN gateway 500 receives a CALL PROC (call setting acceptance) message from the public network 20 (step S708), it sends a 100 Trying (during trial) message to the gatekeeper 400 (step S709).

  Next, when the destination PSTN terminal rings a ring tone and informs the user of the incoming call, an ALERT (calling) message is sent from the public network 20 to the PSTN gateway 500 (step S710). Next, when the PSTN gateway 500 receives the ALERT (calling) message, the PSTN gateway 500 sends a 183 Session Progress message to the gatekeeper 400 (step S711). When the gatekeeper 400 receives the 183 Session Progress message from the PSTN gateway 500, the gatekeeper 400 sends the 183 Session Progress message to the destination PHS gateway 600 (step S712).

  Next, when receiving the 183 Session Progress message from the gatekeeper 400, the PHS gateway 600 sends a PROGRESS message to the PHS terminal 700 (step S713). The PHS terminal 700 accepts a PROGRESS (progress display) message from the PHS gateway 600 to confirm that the called party is ringing.

  Next, when the handset is off-hooked by the user, the destination PSTN terminal sends a CONN (connection) message from the public network 20 to the PSTN gateway 500 (step S714).

  Next, when the PSTN gateway 500 receives a CONN (connection) message from the public network 20, it sends a 200 OK message to the gatekeeper 400 (step S715).

Next, the gatekeeper 400 sends the 200OK message received from the PSTN gateway 500 to the destination PHS gateway 600 (step S716). next,
When receiving the 200 OK message from the gatekeeper 400, the PHS gateway 600 transmits a CONN (connection) message to the destination PHS terminal 700 (step S717). Thereafter, the PHS terminal 700 starts a call with the destination PSTN terminal.

  As described above, when the PHS terminal 700 makes a call to the PSTN terminal having a specific number at the movement destination base B, the gatekeeper 400 of the movement destination base B receives the IP address of the PHS gateway 600 that accepts the call from the PHS terminal 700. When the 110th report is sent from the PHS terminal that has moved from Yokohama to Osaka to determine the PSTN gateway of the destination base B from this subnet, a call is made to the Yokohama police (110) You can call the nearest Osaka police (110) without having to.

  If the destination PSTN terminal is not a specific number, it is transmitted from the PSTN gateway 300 of the home base A in Yokohama to the PSTN network even when a call is made from the destination Osaka.

  In the above embodiment, the mobile terminal is a PHS terminal. However, the present invention can also be applied to a mobile phone terminal. In addition, even if a fixed telephone moves from one location to another due to moving, etc., it is possible to make a call to a specific number from the PSTN gateway installed at each destination location if the phone is connected to the LAN. It is.

  In the above embodiment, the gatekeeper device operating as the call connection management device of the present invention has been described. However, a Centrex gateway device having the same configuration as the gatekeeper device shown in FIG. 2 may be used. In this case, the gatekeeper devices 100 and 400 shown in FIG. 1 are replaced with the Centrex gateway device. Then, once connected to the PSTN network via the IP Centrex network.

  Further, when the Centrex gateway device is installed in the base as well as the gatekeeper device as shown in FIG. 8, the call is made to the specific number terminal as in the above embodiment. However, when a call is made to a PSTN terminal that is not a specific number terminal, the IP terminal is connected to the PSTN network from the IP Centrex network via the Centrex gateway device.

  The configuration of the Centrex gateway devices 800 and 900 at this time is the same as the configuration of the gatekeeper device in FIG.

  In addition, there may be a case where only one gatekeeper device or Centrex gateway device in FIG. 8 is installed at a plurality of bases. In this case, the gatekeeper device or the Centrex gateway device performs call control at a plurality of bases. Become. For example, when there is no gatekeeper device 400 at the site B, the gatekeeper 100 at the site A executes the same process on behalf of the gatekeeper 400 to select the PSTN gateway 500 at the destination site B of the IP terminal and select a specific number. A call can be made to the terminal. Even if there is no Centrex gateway device 900 at the site B, the Centrex gateway device 800 at the site A can perform a similar process to connect to the PSTN network from the IP Centrex network.

  According to the call connection management device, the gatekeeper device, and the Centrex gateway device according to the present invention, an IP phone can connect a call between an IP terminal and a PSTN terminal having a specific number, and can also use an IP Centrex network. This is useful in that it can provide a system.

The figure which shows the structure of the IP telephone system which concerns on embodiment which applied this invention The block diagram which shows the structure of the gatekeeper which concerns on this Embodiment The figure which shows an example of the subnet table which concerns on this Embodiment The figure which shows an example of the specific number table which concerns on this Embodiment The flowchart for demonstrating the operation | movement corresponding to the call from the PHS terminal in the gatekeeper which concerns on this Embodiment. In the IP telephone system according to the present embodiment, H.264 The sequence diagram for demonstrating the operation | movement at the time of a PHS terminal calling to a specific number using H.323 protocol Sequence diagram for explaining an operation when a PHS terminal calls a specific number using the SIP protocol in the IP telephone system according to the present embodiment The figure which shows the structure of another IP telephone system to which this invention is applied.

Explanation of symbols

10 WAN
20 Public line network 30 IP Centrex network 100, 400 Gatekeeper 101 CPU
102 Call connection control unit 103 Memory 104 TCP / IP control unit 200, 600 PHS gateway 210, 220, 610, 620 Base station 300, 500 PSTN gateway 700 PHS terminal 800, 900 Centrex gateway 1031 Subnet table 1032 Specific number table

Claims (7)

A call connection management device for connecting a call in response to a call connection request from an IP terminal connected to an IP network to a PSTN terminal connected to a public line network,
Specific number setting means for setting a specific telephone number;
Subnet setting means for associating and setting subnet information of a base to which the IP terminal is connected and IP address information of a PSTN gateway device installed at the base to which the IP terminal is connected;
Specific number determination means for determining whether or not the destination telephone number transmitted from the IP terminal at the time of the call connection request is a specific telephone number set in the specific number setting means;
When the destination telephone number is a specific telephone number, the subnet is calculated from the IP address of the base to which the IP terminal is connected, and the IP address of the PSTN gateway device that connects the call based on the subnet is set in the subnet setting Call connection destination determining means determined from the means;
A call connection management device comprising: A gatekeeper device for connecting a call in response to a call connection request from an IP terminal connected to an IP network to a PSTN terminal connected to a public line network,
Specific number setting means for setting a specific telephone number;
Subnet setting means for associating and setting subnet information of a base to which the IP terminal is connected and IP address information of a PSTN gateway device installed at the base to which the IP terminal is connected;
Specific number determination means for determining whether or not the destination telephone number transmitted from the IP terminal at the time of the call connection request is a specific telephone number set in the specific number setting means;
When the destination telephone number is a specific telephone number, a subnet is calculated from the IP address of the IP terminal, and the IP address of the PSTN gateway apparatus to which a call is connected based on the subnet is determined from the subnet setting means A connection destination determination means;
A gatekeeper device comprising: The IP terminal is a mobile terminal that moves between a plurality of bases in which PHS gateway devices that accommodate radio base stations are installed,
When the destination telephone number is a specific telephone number, the call connection destination determination means calculates a subnet from the IP address of the base PHS gateway device to which the IP terminal has moved, and connects the call based on the subnet 3. The gatekeeper device according to claim 2, wherein an IP address of the PSTN gateway device to be determined is determined from the subnet setting means.   The call connection destination determining means determines an IP address of a PSTN gateway device in a home base of the IP terminal as a call connection destination when the destination telephone number is not a specific telephone number. 3. The gatekeeper device according to 2. Install a Centrex gateway device that connects to the IP Centrex network at the base to which the IP terminal is connected,
3. The gatekeeper device according to claim 2, wherein the call connection destination determination unit determines an IP address of the Centrex gateway device as a call connection destination when the destination telephone number is not a specific telephone number. A Centrex gateway device for connecting a call in response to a call connection request from an IP terminal connected to an IP network to a PSTN terminal connected to a public network, and connecting to an IP Centrex network,
Specific number setting means for setting a specific telephone number;
Subnet setting means for associating and setting subnet information of a base to which the IP terminal is connected and IP address information of a PSTN gateway device installed at the base to which the IP terminal is connected;
Specific number determination means for determining whether or not the destination telephone number transmitted from the IP terminal at the time of the call connection request is a specific telephone number set in the specific number setting means;
When the destination telephone number is a specific telephone number, a subnet is calculated from the IP address of the IP terminal, and the IP address of the PSTN gateway apparatus to which a call is connected based on the subnet is determined from the subnet setting means A connection destination determination means;
A Centrex gateway device comprising: When the destination telephone number is not a specific telephone number, the call connection destination determination means determines the telephone number as a call connection destination, connects to the PSTN network via the IP Centrex network, and the PSTN network 7. The Centrex gateway apparatus according to claim 6, wherein a call is connected to the PSTN terminal having the telephone number .

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