JP5009961B2 - Call processing system, call processing apparatus, and call processing method - Google Patents

Description

  The present invention relates to a call processing system, a call processing device, and a call processing method.

  In a communication network, subscribers may be transferred from one network (B network) to another network (A network) for the purpose of improving service functions and quality. In this case, it is important to transfer subscribers while continuing call processing.

JP 2002-252700 A

  However, even in the A network, a subscriber may be transferred from one call processing device (source server) to another call processing device (destination server). The subscriber will eventually use the destination server, but during the transition, it is important to use the original server or the B network call processing device (other server) to continue the call processing. It is.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a call processing system, a call processing device, and a call processing device capable of transferring a subscriber between three call processing devices while continuing the call processing. It is to provide a processing method.

  A call processing system according to a first aspect of the present invention includes a first call processing device and a second call processing device, and is used together with a third call processing device, wherein the first call processing device includes: For each subscriber, first data for transmitting a call from the first call processing device to the terminal device used for the subscriber, and from the second call processing device to the terminal device used for the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the first call processing device to a terminal device used for the subscriber, and used for the subscriber A second flag that is set to be valid when a call can be transmitted from a plurality of call processing devices to the terminal device, and a subscriber data storage unit that stores subscriber data that is received by the first call processing device. Subscription in the subscriber data store corresponding to the destination of the called call It is determined whether or not the first flag in the data is valid. If it is valid, the call is transferred to the terminal device based on the first data. If it is not valid, it is determined whether or not the second flag is valid. And a signal transmission unit for transferring a call to a second call processing device based on the data. The second call processing device sends a second call to a terminal device used by the subscriber for each subscriber. First data for transmitting a call from a processing device, second data for transmitting a call from a third call processing device to a terminal device used for the subscriber, and a terminal used for the subscriber A first flag that is set to be valid when a call is to be sent from the second call processing device to the device, and is set to be valid when a call can be sent from a plurality of call processing devices to the terminal device used for the subscriber Subscriber data in which subscriber data including a second flag is stored It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the storage unit and the second call processing device is valid. And a signal transmission unit that determines whether the second flag is valid if not valid and forwards the call to the third call processing device based on the second data if valid. It is characterized by that.

  A call processing device according to a second aspect of the present invention is a first call processing device in a call processing system that includes first and second call processing devices and is used together with a third call processing device. The second call processing device includes, for each subscriber, first data for transmitting a call from the second call processing device to a terminal device used by the subscriber, and a terminal device used by the subscriber. Second data for transmitting a call from the third call processing device, and a first flag that is effectively set when a call is to be transmitted from the second call processing device to the terminal device used for the subscriber; A subscriber data storage unit that stores subscriber data including a second flag that is set to be valid when a call can be transmitted from a plurality of call processing devices to the terminal device used by the subscriber; The subscriber data corresponding to the destination of the call received by the second call processing device. It is determined whether or not the first flag in the subscriber data in the storage unit is valid. If it is valid, the call is transferred to the terminal device based on the first data, and if it is not valid, it is determined whether or not the second flag is valid. And a signal transmission unit that transfers a call to a third call processing device based on the second data if valid, and the first call processing device is a terminal device used by the subscriber for each subscriber. First data for transmitting a call from the first call processing device, second data for transmitting a call from the second call processing device to the terminal device used for the subscriber, and the subscriber A first flag that is set to be valid when a call is to be transmitted from the first call processing device to the terminal device used for the communication, and calls can be transmitted from a plurality of call processing devices to the terminal device used for the subscriber In such a case, the subscriber data including the second flag set to be valid is recorded. And determining whether the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the first call processing device and the subscriber data storage unit is valid. If the call is transferred to the terminal device based on the first data, if not valid, it is determined whether the second flag is valid. If valid, the signal is transferred to the second call processing device based on the second data. And a transmission unit.

  A call processing device according to a third aspect of the present invention is a second call processing device in a call processing system that includes the first and second call processing devices and is used together with the third call processing device. The first call processing device includes, for each subscriber, first data for transmitting a call from the first call processing device to a terminal device used for the subscriber, and a terminal device used for the subscriber. Second data for transmitting a call from the second call processing device, and a first flag that is effectively set when a call is to be transmitted from the first call processing device to the terminal device used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be valid when a call can be transmitted from a plurality of call processing devices to the terminal device used by the subscriber; The subscriber data corresponding to the destination of the call received by one call processing device. It is determined whether or not the first flag in the subscriber data in the storage unit is valid. If it is valid, the call is transferred to the terminal device based on the first data, and if it is not valid, it is determined whether or not the second flag is valid. And a signal transmission unit for transferring a call to a second call processing device based on the second data if valid, the second call processing device being a terminal device used by the subscriber for each subscriber. First data for transmitting a call from the second call processing device to the terminal device, second data for transmitting a call from the third call processing device to the terminal device used for the subscriber, and the subscriber A first flag that is set to be effective when a call is to be transmitted from the second call processing device to the terminal device used for the communication, and calls can be transmitted from a plurality of call processing devices to the terminal device used for the subscriber In such a case, the subscriber data including the second flag set to be valid is recorded. And whether the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the second call processing device is valid or not is determined. A call is transferred to the terminal device based on the first data, and if not valid, it is determined whether or not the second flag is valid, and if valid, a signal for forwarding the call to the third call processing device based on the second data And a transmission unit.

  A call processing method according to a fourth aspect of the present invention is a call processing method in a call processing system that includes the first and second call processing devices and is used together with the third call processing device. For each subscriber, the processing device has first data for transmitting a call from the first call processing device to the terminal device used for the subscriber, and second data for the terminal device used for the subscriber. Second data for transmitting a call from the call processing device, a first flag that is set to be valid when a call is to be transmitted from the first call processing device to the terminal device used by the subscriber, and the subscription A subscriber data storage unit for storing subscriber data including a second flag that is set to be effective when a call can be transmitted from a plurality of call processing devices to a terminal device used by the subscriber, The call processing device is a terminal used for each subscriber. First data for transmitting a call from the second call processing device to the terminal, second data for transmitting a call from the third call processing device to the terminal device used for the subscriber, and the subscription A first flag that is set to be valid when a call is to be transmitted from a second call processing device to a terminal device used by a subscriber, and calls from a plurality of call processing devices are transmitted to the terminal device used by the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be valid when possible, and the signal processing unit of the first call processing device includes: It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by one call processing device is valid, and if it is valid, the terminal device is based on the first data. If the call is forwarded and the second flag is valid if not valid If it is valid, the call is forwarded to the second call processing device based on the second data, and the signal transmission unit of the second call processing device sets the destination of the call received by the second call processing device. It is determined whether or not the first flag in the subscriber data in the corresponding subscriber data storage unit is valid. If it is valid, the call is transferred to the terminal device based on the first data. If not valid, the second flag is valid. If it is valid, the call is transferred to the third call processing device based on the second data.

  According to the present invention, a subscriber can be transferred between three call processing devices while continuing the call processing.

It is a connection diagram which shows the structure of the call processing system which concerns on this Embodiment. It is a block diagram which shows schematic structure of the subscriber system SIP server 2c. It is a block diagram which shows schematic structure of the subscriber system SIP server 2b. It is a sequence diagram for demonstrating operation | movement of a call processing system.

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

  FIG. 1 is a connection diagram showing a configuration of a call processing system according to the present embodiment. The call processing system is a communication system that performs communication based on a protocol called Session Initiation Protocol (hereinafter, abbreviated as SIP), and includes a relay SIP server 1 and subscriber SIP servers 2a, 2b, and 2c that are call processing devices. Subscriber accommodation routers 3a and 3b, terminal devices 4a and 4b, and a terminal device (not shown). Each terminal device is a terminal device operated by a user (also referred to as a subscriber). Here, a subscriber who uses the terminal device 4a is referred to as a subscriber U.

  The subscriber SIP server 2b, the subscriber SIP server 2c, the subscriber accommodation router 3b, the terminal device 4b, etc. belong to the A network, and the subscriber SIP server 2a, the subscriber accommodation router 3a, the terminal device 4a, etc. It belongs to B network.

  The subscriber SIP server 2b is connected to the relay SIP server 1.

  The subscriber SIP servers 2b and 2c are connected to each other via a relay router (not shown) and connected to the relay SIP server 1.

  The subscriber accommodation router 3a is connected to the subscriber SIP server 2a, and the subscriber accommodation router 3b is connected to the subscriber SIP servers 2a and 2b. The terminal device 4a is connected to the subscriber accommodation router 3a, and the terminal device 4b is connected to the subscriber accommodation router 3b. Other terminal devices are also connected to each subscriber accommodation router.

  The relay SIP server 1 is a server including a relay session control function based on SIP and a connection control function with another network. The subscriber SIP servers 2b and 2c are servers including a subscriber session control function based on SIP. The subscriber accommodation router 3a is a router that accommodates the terminal device 4a and the like, and the subscriber accommodation router 3b is a router that accommodates the terminal device 4b and the like.

  If the number of terminal devices that use the subscriber SIP server 2b in the A network increases steadily, it becomes necessary to introduce a new subscriber SIP server 2c. In that case, the subscriber SIP server 2b accommodates the subscriber SIP server 2b. It is necessary to transfer the subscribers who have been managed, for example, subscribers under the subscriber accommodation router 3b, to the subscriber SIP server 2c. When the subscriber U moves to the A network, the subscriber SIP server 2b is used once for a call addressed to the subscriber U or the like, but from a certain timing, the subscriber SIP server 2c is used. It is supposed to be.

  FIG. 2 is a block diagram showing a schematic configuration of the subscriber SIP server 2c.

  The subscriber SIP server 2c includes a receiving unit 21 that receives a call, a transmitting unit 22 that transmits a call, and a subscriber data storage unit 23 that stores subscriber data.

  The subscriber data storage unit 23 stores subscriber data for each subscriber. The subscriber data includes service related information (not shown) related to the subscriber. Further, here, for a call addressed to the subscriber U (that is, a call whose destination is indicated by a telephone number assigned to the subscriber U, the same shall apply hereinafter), via the subscriber SIP server 2b, If the terminal device 4b receives the data via the subscriber SIP server 2c, the subscriber data of the target subscriber such as the subscriber U is further added to the subscriber. Identification information indicating the accommodating router 3b (abbreviated as “router 3b” in the figure), identification information indicating the subscriber SIP server 2b (abbreviated as “server 2b” in the figure), a flag f1, and a flag f2 are included. It is.

  The flag f1 is set to ON when a call is to be transmitted from the subscriber SIP server 2c to the terminal device used by the subscriber. The flag f1 is off by default. The flag f2 is set to ON when a call can be transmitted from a plurality of subscriber SIP servers to the terminal device used for the subscriber. For example, since a call can be transmitted to the terminal device 4b from the subscriber SIP servers 2b and 2c, the flag f2 is turned on.

  FIG. 3 is a block diagram showing a schematic configuration of the subscriber SIP server 2b.

  The subscriber SIP server 2b includes a receiving unit 21 that receives a call, a transmitting unit 22 that transmits a call, and a subscriber data storage unit 23 that stores subscriber data.

  The subscriber data storage unit 23 stores subscriber data for each subscriber. The subscriber data includes service related information (not shown) related to the subscriber. Further, here, the call addressed to the subscriber U is received by the terminal device 4a via the subscriber SIP server 2a. However, the subscriber U stops using the A network and the B network. In other words, when the terminal device 4b receives the call via the subscriber SIP server 2b by using the terminal device 4b belonging to the B network, the subscriber U For the subscriber data of the target subscriber, the identification information indicating the subscriber accommodating router 3b (abbreviated as “router 3b” in the figure) and the identification information indicating the subscriber SIP server 2a (in the figure “server 2a”). ”), A flag f1, and a flag f2.

  The flag f1 is set to ON when a call is to be transmitted from the subscriber SIP server 2b to the terminal device used by the subscriber. The flag f1 is off by default. The flag f2 is set to ON when a call can be transmitted from a plurality of subscriber SIP servers to the terminal device used for the subscriber. For example, since the call can be transmitted from the subscriber SIP servers 2b and 2c to the terminal device 4b and the call can be transmitted from the subscriber SIP server 2a to the terminal device 4a, the flag f2 is turned on. .

(Operation of call processing system)
Next, the operation of the call processing system will be described.

  For example, the subscriber U has previously paid a fee to a telecommunications carrier operated by the B network, so that the terminal device 4a transmits a call transmitted from, for example, a terminal device belonging to the A network to the B network. Is received via the subscriber SIP server 2a and the subscriber accommodating router 3a belonging to

  The operation at this time will be described with reference to FIG.

  A call arriving at the relay SIP server 1 is received by the terminal device 4a through the route R0 in FIG.

  For this purpose, when the call (INV) addressed to the subscriber U is received in the relay SIP server 1, routing is set so as to transfer the call to the subscriber SIP server 2a.

  In addition, when a call (INV) addressed to the subscriber U is received in the subscriber SIP server 2a in advance, routing is set so that the call is transferred to the subscriber accommodation router 3a.

  In addition, although not shown, the subscriber SIP server 2a is provided with subscriber data including service related information regarding the subscriber U, and a flag (referred to as flag f1) is provided in the subscriber data. The flag f1 is off by default.

  The terminal device 4a transmits a register signal (REG) to the subscriber accommodation router 3a when the power is turned on. The subscriber accommodation router 3a transmits a register signal (REG) to the subscriber SIP server 2a. Thereby, the subscriber SIP server 2a turns on the flag f1 in the subscriber data regarding the subscriber U.

  When the relay SIP server 1 receives a call (INV) addressed to the subscriber U, it transfers the call to the subscriber SIP server 2a based on the routing setting.

  If the subscriber SIP server 2a receives a call (INV) addressed to the subscriber U, the subscriber SIP server 2a refers to the subscriber data relating to the subscriber U. If the flag f1 is on, the subscriber SIP router 2a is based on the routing setting. Transfer the call to 3a.

  When the subscriber accommodation router 3a receives a call (INV) addressed to the subscriber U, the subscriber accommodation router 3a transfers the call to the terminal device 4a.

  Next, the operation when the subscriber U stops using the A network and uses the B network will be described. The subscriber U stops using the terminal device 4a and uses the terminal device 4b.

  First, service-related information related to the subscriber U is transferred from the subscriber SIP server 2a to the subscriber SIP servers 2b and 2c via a maintenance operation device (not shown) and set.

  That is, as shown in FIG. 2, subscriber data including service-related information regarding the subscriber U is generated in the subscriber data storage unit 23 of the subscriber SIP server 2c. The identification information indicating the accommodating router 3b, the identification information indicating the subscriber SIP server 2b, and the flags f1 and f2 are stored. The flags f1 and f2 are off and on respectively by default.

  Further, as shown in FIG. 3, subscriber data including service-related information regarding the subscriber U is generated in the subscriber data storage unit 23 of the subscriber SIP server 2b, and the subscriber data is further added to the subscriber data. The identification information indicating the accommodating router 3b, the identification information indicating the subscriber SIP server 2a, and the flags f1 and f2 are stored. The flags f1 and f2 are off and on respectively by default.

  Also, when the relay SIP server 1 receives a call (INV) addressed to the subscriber U, the routing setting is changed so that the call is transferred to the subscriber SIP server 2c.

  Further, when a call (INV) addressed to the subscriber U is received in the subscriber SIP server 2b, routing is set so that the call is transferred to the subscriber SIP server 2c.

  In addition, when the subscriber SIP server 2c receives a call (INV) addressed to the subscriber U, routing is set so that the call is transferred to the subscriber accommodation router 3b.

  In addition, SRN (Server Routing Number) is set in the subscriber SIP server 2c via the maintenance operation device. That is, a setting is made such that the routing destination is designated to the subscriber SIP server 2b with a number called SRN so that the call transmitted from the subscriber SIP server 2c does not return.

  Even after the setting is made in the A network in this way, the terminal device 4b is not used, and the terminal device 4a may still be used. Even in this case, for example, the call is received by the terminal device 4a.

  At this time, the call arriving at the relay SIP server 1 is received by the terminal device 4a through the route R1 in FIG.

  First, in the sequence diagram of FIG. 4, when the relay SIP server 1 receives a call (INV) addressed to the subscriber U, it transfers the call to the subscriber SIP server 2c based on the routing setting (S1). .

  In the subscriber SIP server 2 c, the reception unit 21 receives the call and passes the call to the transmission unit 22. The transmitting unit 22 first determines whether or not the flag f1 is on in the subscriber data related to the subscriber U stored in the subscriber data storage unit 23 (S3). Since the flag f1 is off, the transmitting unit 22 next determines whether or not the flag f2 is on (S5). Since the flag f2 is on, the transmitter 22 transfers the call to the subscriber SIP server 2b set in the subscriber data related to the subscriber U (S7). The subscriber SIP server 2b is set to be routed so as to transfer the call addressed to the subscriber U to the subscriber SIP server 2c. Thus, the call is sent to the subscriber SIP server 2c. The subscriber SIP server 2c designates the routing destination to the subscriber SIP server 2b with a number called SRN so as not to be transferred (not returned).

  In the subscriber SIP server 2b, the receiving unit 21 receives the call and passes the call to the transmitting unit 22. The transmission unit 22 normally transmits (returns) the call immediately to the subscriber SIP server 2c based on the routing setting, but does not return the call by the SRN. First, the transmission unit 22 stores the call in the subscriber data storage unit 23. It is determined whether or not the flag f1 is ON in the stored subscriber data relating to the subscriber U (S9). Since the flag f1 is off, the transmitting unit 22 next determines whether or not the flag f2 is on (S13). Since the flag f2 is on, the transmission unit 22 transfers the call to the relay SIP server 1 so that the call is transferred to the subscriber SIP server 2a set in the subscriber data related to the subscriber U (S15). .

  Here, the subscriber SIP server 2b is set in advance to transfer the call (in this case, 301 response) to the relay SIP server 1 when the call is transferred to the subscriber SIP server 2a. With this setting, the transmission unit 22 transfers the call (301 response) to the relay SIP server 1 (S15).

  When the relay SIP server 1 receives the call addressed to the subscriber U (301 response), the relay SIP server 1 transfers the call to the subscriber SIP server 2a (S17). Here, the relay SIP server 1 is set in advance so that when the 301 response is received, it is forwarded to the call subscriber SIP server 2a. Is transferred to the subscriber SIP server 2a (S17).

  When the subscriber SIP server 2a receives a call (INV) addressed to the subscriber U, the subscriber SIP server 2a refers to the subscriber data related to the subscriber U, and the flag f1 is on, so the subscriber accommodating router set in the subscriber data The call is transferred to the terminal device 4a via 3a (S19).

  Next, the operation when the terminal device 4b starts to be used and a call addressed to the subscriber U is received by the terminal device 4b will be described.

  At this time, the call arriving at the relay SIP server 1 is received by the terminal device 4b through the route R2 in FIG.

  The terminal device 4b transmits a register signal (REG) to the subscriber accommodation router 3b when the power is turned on. The subscriber accommodation router 3b transmits the register signal (REG) transmitted from the terminal device 4b to the subscriber SIP server 2b until the use start time of the subscriber SIP server 2c. Thereby, the subscriber SIP server 2b turns on the flag f1 in the subscriber data regarding the subscriber U.

  In FIG. 4, as described above, the subscriber SIP server 2c transfers the call addressed to the subscriber U to the subscriber SIP server 2b (S7). At this time, the routing destination is the subscriber SIP server 2b. Is specified.

  In the subscriber SIP server 2b, the receiving unit 21 receives the call and passes the call to the transmitting unit 22. The transmitting unit 22 does not return the call to the subscriber SIP server 2c by the SRN, and first determines whether or not the flag f1 is ON in the subscriber data related to the subscriber U stored in the subscriber data storage unit 23. (S9). Since the flag f1 is on, the transmission unit 22 transfers the call to the subscriber accommodation router 3b set in the subscriber data related to the subscriber U, and the subscriber accommodation router 3b transfers the call to the terminal device 4b (S21). ).

  Next, an operation when the terminal device 4b receives a call addressed to the subscriber U via the subscriber SIP server 2c will be described. At this time, the call arriving at the relay SIP server 1 is received by the terminal device 4b through the route R3 in FIG.

  The terminal device 4b transmits a register signal (REG) to the subscriber accommodation router 3b when the power is turned on. The subscriber accommodation router 3b transmits the register signal (REG) transmitted from the terminal device 4b to the subscriber SIP server 2c from the use start time of the subscriber SIP server 2c. Accordingly, the subscriber SIP server 2c turns on the flag f1 in the subscriber data regarding the subscriber U. On the other hand, because the register signal (REG) is not transmitted, the subscriber SIP server 2b turns off the flag f1 in the subscriber data regarding the subscriber U.

  In FIG. 4, when receiving a call (INV) addressed to the subscriber U, the relay SIP server 1 transfers the call to the subscriber SIP server 2c based on the routing setting (S1).

  In the subscriber SIP server 2 c, the reception unit 21 receives the call and passes the call to the transmission unit 22. The transmitting unit 22 first determines whether or not the flag f1 is on in the subscriber data related to the subscriber U stored in the subscriber data storage unit 23 (S3). Since the flag f1 is on, the transmission unit 22 transfers the call to the subscriber accommodation router 3b set in the subscriber data regarding the subscriber U, and the subscriber accommodation router 3b transfers the call to the terminal device 4b (S31). ).

  Note that the subscriber SIP server 2c deletes the flag f2 when the flag f1 is turned on in all target subscriber data such as the subscriber U, for example. Even after the deletion, if the flag f1 is on, for example, a call addressed to the subscriber U passes through the route R3 in FIG. 1 and is received by the terminal device 4b via the subscriber SIP server 2c.

  The operation at this time will be described.

  In FIG. 4, when receiving a call (INV) addressed to the subscriber U, the relay SIP server 1 transfers the call to the subscriber SIP server 2c based on the routing setting (S1).

  In the subscriber SIP server 2 c, the reception unit 21 receives the call and passes the call to the transmission unit 22. The transmitting unit 22 first determines whether or not the flag f1 is on in the subscriber data related to the subscriber U stored in the subscriber data storage unit 23 (S3). Since the flag f1 is on, the transmission unit 22 immediately transfers the call to the subscriber accommodation router 3b based on the routing setting, and the subscriber accommodation router 3b transfers the call to the terminal device 4b.

  For example, when the terminal device is removed and the register signal (REG) is not transmitted, the subscriber SIP server 2c turns off the flag f1 in the corresponding subscriber data. As a result, in the subscriber SIP server 2c, when a call addressed to the corresponding subscriber is received, it is determined that the flag f1 is off and the flag f2 is deleted, so that an error response is made.

  In the above description, the case where the subscriber U is transferred from the subscriber SIP server 2a to the subscriber SIP server 2c via the subscriber SIP server 2b has been described. However, the subscriber SIP server 2a is used. Another subscriber may be transferred to the subscriber SIP server 2b and not transferred to the subscriber SIP server 2c. In this case, for the subscriber, the routing SIP server 1 performs routing setting change so as to transfer the call to the subscriber SIP server 2b, and the subscriber SIP server 2b sends the call to the subscriber. Routing is set so as to be transferred to the system SIP server 2c, and subscriber data is not required for the subscriber system SIP server 2c.

  Further, another subscriber who has been using the subscriber SIP server 2b from the beginning may be transferred to the subscriber SIP server 2c. In this case, for the subscriber, the routing system SIP server 1 performs routing setting change so as to transfer the call to the subscriber SIP server 2c, and the subscriber SIP server 2b sends the call to the subscriber. The routing is set so as to be transferred to the system SIP server 2c, the routing is set so that the call is transferred to the subscriber accommodation router 3b in the subscriber system SIP server 2c, and the subscriber system SIP server 2b is set. Does not require subscriber data.

  As described above, the call processing system according to the present embodiment includes the subscriber SIP servers 2c and 2b (also referred to as first and second call processing devices, respectively), and the subscriber SIP server 2a (first The first call processing device is used for identification information indicating the subscriber accommodating router 3b for each subscriber (that is, used for the subscriber). First data for transmitting a call from the first call processing device to the terminal device, and identification information indicating the subscriber SIP server 2b (that is, the second call processing device in the terminal device used by the subscriber) Second data for transmitting a call from the first) and flag f1 (that is, the first data set to be valid (on) when a call is to be transmitted from the first call processing device to the terminal device used by the subscriber) Flag) and flag f2 (Tsumama) A subscriber data storage unit for storing subscriber data including a second flag set to valid (on) when a call can be transmitted from a plurality of call processing devices to the terminal device used by the subscriber 23, it is determined whether or not the first flag in the subscriber data in the subscriber data storage unit 23 corresponding to the destination of the call received by the first call processing device is valid (S1). The call is transferred to the terminal device based on the data (S31), and if not valid, it is determined whether the second flag is valid (S5). If valid, the call is transferred to the second call processing device based on the second data. The second call processing device includes identification information indicating the subscriber accommodating router 3b (that is, a terminal device used for the subscriber) for each subscriber. A first device for transmitting a call from the second call processing device to ), Identification information indicating the subscriber SIP server 2a (that is, second data for transmitting a call from the third call processing device to the terminal device used by the subscriber), and a flag f1 (that is, the When a call is to be transmitted from the second call processing device to the terminal device used by the subscriber, the first flag set to valid (ON)) and the flag f2 (that is, to the terminal device used by the subscriber) A second flag that is set to valid (on) when calls can be transmitted from a plurality of call processing devices), and a second call processing device. It is determined whether the first flag in the subscriber data in the subscriber data storage unit 23 corresponding to the destination of the received call is valid (S9). If valid, the call is transferred to the terminal device based on the first data. (S21), if not valid, the second frame It is determined whether or not the lag is valid (S13), and if it is valid, the call is transferred to the third call processing device based on the second data (S15), and the signal transmission unit (transmission unit 22) is provided. 4a to terminal device 4b, there is no restriction on the use switching time, so it is very convenient for a subscriber who stops using the A network and uses the B network, and is a target subscriber such as the subscriber U. For the call addressed to, the switching from the second call processing device (2b) to the use of the first call processing device (2c) does not cause a period during which the terminal device 4b cannot be used, and the target subscription It is very convenient for the person.

  Further, since there is no restriction on the use switching time as in the case of the terminal device 4a to the terminal device 4b, there is an advantage that it is easy for the telecommunications carrier operating the B network to acquire subscribers, and the For a call addressed to a target subscriber, there is no period during which the terminal device 4b cannot be used when the second call processing device (2b) is switched to use the first call processing device (2c). Therefore, it is only necessary to increase the number of call processing devices in accordance with the increase in the number of subscribers of the B network, and it is not necessary to provide a large number of call processing devices from the beginning, thereby reducing the initial investment cost.

  A computer program for causing a computer to function as the subscriber SIP servers 2b and 2c is stored in a computer-readable recording medium such as a semiconductor memory, a magnetic disk, an optical disk, a magneto-optical disk, or a magnetic tape, and displayed. The computer program may be distributed via a communication network such as the Internet.

DESCRIPTION OF SYMBOLS 1 ... Relay system SIP server 2a, 2b, 2c ... Subscriber system SIP server 3a, 3b ... Subscriber accommodation router 4a, 4b ... Terminal device 21 ... Reception part 22 ... Transmission part 23 ... Subscriber data storage part

Claims (4)

A call processing system for use with a third call processing device, including first and second call processing devices,
The first call processing device includes:
For each subscriber, first data for transmitting a call from the first call processing device to the terminal device used for the subscriber, and from the second call processing device to the terminal device used for the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the first call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be effective when a call can be transmitted from a plurality of call processing devices to the terminal device.
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the first call processing device is valid, and if it is valid, the terminal device based on the first data A signal transmitting unit that determines whether or not the second flag is valid if not valid, and forwards the call to the second call processing device based on the second data if valid.
The second call processing device includes:
For each subscriber, first data for transmitting a call from the second call processing device to the terminal device used by the subscriber, and from the third call processing device to the terminal device used by the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the second call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be effective when a call can be transmitted from a plurality of call processing devices to the terminal device.
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the second call processing device is valid, and if it is valid, the terminal device based on the first data And a signal transmission unit that determines whether or not the second flag is valid if it is not valid, and forwards the call to the third call processing device based on the second data if it is valid. Call processing system. A first call processing device in a call processing system that includes first and second call processing devices and is used with a third call processing device,
The second call processing device includes:
For each subscriber, first data for transmitting a call from the second call processing device to the terminal device used by the subscriber, and from the third call processing device to the terminal device used by the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the second call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be effective when a call can be transmitted from a plurality of call processing devices to the terminal device.
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the second call processing device is valid, and if it is valid, the terminal device based on the first data A signal transmission unit that determines whether or not the second flag is valid if not valid, and forwards the call to the third call processing device based on the second data if valid.
The first call processing device includes:
For each subscriber, first data for transmitting a call from the first call processing device to the terminal device used for the subscriber, and from the second call processing device to the terminal device used for the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the first call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be effective when a call can be transmitted from a plurality of call processing devices to the terminal device.
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the first call processing device is valid, and if it is valid, the terminal device based on the first data And a signal transmission unit that determines whether or not the second flag is valid if it is not valid, and forwards the call to the second call processing device based on the second data if it is valid. Call processing device. A second call processing device in a call processing system including the first and second call processing devices and used with the third call processing device,
The first call processing device includes:
For each subscriber, first data for transmitting a call from the first call processing device to the terminal device used for the subscriber, and from the second call processing device to the terminal device used for the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the first call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be effective when a call can be transmitted from a plurality of call processing devices to the terminal device.
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the first call processing device is valid, and if it is valid, the terminal device based on the first data A signal transmitting unit that determines whether or not the second flag is valid if not valid, and forwards the call to the second call processing device based on the second data if valid.
The second call processing device includes:
For each subscriber, first data for transmitting a call from the second call processing device to the terminal device used by the subscriber, and from the third call processing device to the terminal device used by the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the second call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be effective when a call can be transmitted from a plurality of call processing devices to the terminal device.
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the second call processing device is valid, and if it is valid, the terminal device based on the first data And a signal transmission unit that determines whether or not the second flag is valid if it is not valid, and forwards the call to the third call processing device based on the second data if it is valid. Call processing device. A call processing method in a call processing system including a first and second call processing device and used with a third call processing device,
The first call processing device includes:
For each subscriber, first data for transmitting a call from the first call processing device to the terminal device used for the subscriber, and from the second call processing device to the terminal device used for the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the first call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be valid when a call can be transmitted from a plurality of call processing devices to the terminal device,
The second call processing device includes:
For each subscriber, first data for transmitting a call from the second call processing device to the terminal device used by the subscriber, and from the third call processing device to the terminal device used by the subscriber. Second data for transmitting a call, a first flag that is set to be valid when a call is to be transmitted from the second call processing device to a terminal device used for the subscriber, and used for the subscriber A subscriber data storage unit that stores subscriber data including a second flag that is set to be valid when a call can be transmitted from a plurality of call processing devices to the terminal device,
The call processing method includes:
The signal transmission unit of the first call processing device includes:
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the first call processing device is valid, and if it is valid, the terminal device based on the first data If it is not valid, it is determined whether the second flag is valid, and if valid, the call is forwarded to the second call processing device based on the second data;
A signal transmission unit of the second call processing device;
It is determined whether or not the first flag in the subscriber data in the subscriber data storage unit corresponding to the destination of the call received by the second call processing device is valid, and if it is valid, the terminal device based on the first data A call processing method comprising: determining whether the second flag is valid if not valid, and forwarding the call to the third call processing device based on the second data if valid.

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