JP2012060279A - Pbx backup system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of the conventional PBX backup system in which call connection between terminal devices cannot be performed in a short time and with a small communication traffic in case of a fault.SOLUTION: Means 22 stores station data required for call connection of a terminal device 30 contained in a server 200. Means 26 stores a call state of the terminal device 30 and an event content. Means 29 reads the call state of the terminal device 30 and the event content to transmit them to a server 100. When a call connection instruction signal is received from the server 100, the call connection instruction signal is transmitted to the terminal device 30. When receiving the call state of the originator terminal device and the event content, means 28 specifies the call destination terminal device to transmit the call connection instruction signal to the terminal device. Means 27 transmits the event content and the call state of the originator terminal device stored in the means 26 to the server 100 in the case that the communication is possible, and to the means 28 in the case that the communication is impossible.

Description

  The present invention relates to a PBX backup system that enables call connection of a terminal device in the event of a network failure or an exchange failure.

  FIG. 6 shows a first example of this type of conventional PBX backup system. This PBX backup system includes a network 40-2 in which the exchange 50 on the network 40-1 is connected to the IP terminals 301-3 and 301-4 on the network 40-1 and the network 40-1 through the network 40. The above IP terminals 301-5 and 301-6 are accommodated to control call connection, and a backup device 60 is provided on the network 40-2. When the exchange 50 is down or when connection to the exchange 50 is impossible due to a failure of the network 40, the IP terminals 301-5 and 301-6 control the call connection of the backup device 60 from the control of the call connection of the exchange 50. Switch to control. As a result, the IP terminals 301-5 and 301-6 can be connected again.

  In the above PBX backup system, in order to switch the control of call connection to the IP terminals 301-5 and 301-6, the call connection of the IP terminals 301-5 and 301-6 to the backup device 60 is started. Since it is necessary to register, it takes time until the call connection becomes possible, and the call connection during communication may be disconnected. Furthermore, the IP terminals 301-3 and 301-4 are not relieved, and the service functions that can be used for call connection by the backup device 60 are limited.

  FIG. 7 shows a second example of this type of conventional PBX backup system. In this PBX backup system, an exchange 50, a backup device 61, and a backup device 62 are installed in networks 40-3, 40-4, and 40-5 connected by an IP network 41, respectively. The exchange 50 accommodates terminal devices 30-1 and 30-3 installed in the network 40-4 and terminal devices 30-2 and 30-4 installed in the network 40-5.

  When a failure occurs in the exchange 50 and the exchange 50 becomes unusable, the terminal devices 30-1 to 30-4 are separated from the accommodation of the exchange 50, and the terminal devices 30-1 and 30-3 are accommodated in the backup device 61. The terminal devices 30-2 and 30-4 are accommodated in the backup device 62. The backup device 61 obtains and registers the terminal data of the terminal devices 30-2 and 30-4 from the backup device 62, and the backup device 62 stores the terminal data of the terminal devices 30-1 and 30-3 from the backup device 61. Obtain and register. In this way, when the backup device 61 and the backup device 62 exchange data between the terminal devices that are relieved, the call connection between the backup device 61 and the backup device 62 is operating under the switch 50. The same call connection service is possible.

  However, in this backup system, after the failure occurs, the backup device accommodates each terminal device and exchanges and registers the terminal device data necessary for call connection between the backup devices. It takes time until the call connection between the terminal devices becomes possible again.

  FIG. 8 shows a third example of this type of conventional PBX backup system. This PBX backup system is provided with an IP Centrex center 70 in which a main server 71 is installed, and a survival server 81 as an alternative to the main server 70 at a base 80 connected via an IP network 41. is there. The main server 71 has an IP-PBX function for the IP telephone terminals 82 to 84 installed at the base 80.

  In establishing communication between the IP telephone terminals 82 to 84, a call setting request is transmitted from the IP telephone terminals 82 to 84 to the main server 71, the predetermined call control is performed by the main server 71, and the call state is also maintained. When communication is established, the call control information is transmitted to the survival server 81. As a result, the survival server 81 holds the same call control information as the call control information managed by the main server 71. Therefore, if a failure occurs in the main server 71 or the IP network 41, communication can be maintained.

  However, in this PBX backup system, the main server 71 has a normal IP-PBX function, and holds information for establishing communication (IP telephone terminal status, call connection progress, call control information). Therefore, call control information is transmitted / received to / from the IP telephone terminal, and the amount of communication increases. In addition, the survival server 81 needs to be equipped with functions equivalent to those of the main server 71, and the IP telephone terminal needs to be equipped with multiple functions, resulting in high costs.

Japanese Patent Laid-Open No. 1005-006121 JP 1000788544 A JP 1007-266737 A

  The problem to be solved is that it is not possible to make a call connection between terminal devices in a short time and with a small amount of communication in the event of a network or switch failure.

  According to the present invention, the hosted VoIP server controls the call state transition between the terminal devices via the local server, and when the failure occurs, the local server substitutes only for the call state transition of the accommodated terminal device. Main features.

  In the PBX backup system of the present invention, when communication between the hosted VoIP server and the local server is impossible due to a failure, the call state transition of the call connection is transferred from the hosted VoIP server to the local server accommodating the terminal device in the base. Since the local server performs the call state transition, the call connection can be performed again, so that the local server accommodates the terminal device and the procedure for accommodating the terminal device is not required. There is an advantage that the call connection can be made again, and the service stop time of the terminal device can be greatly reduced.

  Also, when the failure is recovered and the terminal device call state transition is established between different bases, only the terminal device call state and event contents are transmitted and received between the hosted VoIP server and the local server, so the amount of data Compared to a system that stores information of all terminal devices in each server by replication, the method can be applied to an IP network having a narrow bandwidth.

  Also, considering the method of upgrading the service between bases in the terminal device, it is sufficient to upgrade only the hosted VoIP server.

  In this system, since the terminal device is accommodated in the local server, even if a hosted VoIP server failure or an IP network failure occurs except during two-party communication, call state transition control is switched. It is possible to continue the call.

1 is a system configuration diagram showing a basic configuration of an embodiment of a PBX backup system according to the present invention. It is a block diagram which shows Example 1 of the PBX backup system concerning this invention. 3 is a block diagram showing details of a hosted VoIP server 100, a local server 200, and a terminal device 30. FIG. It is a flowchart which shows control of the call state transition in hosted mode. It is a flowchart which shows control of the call state transition in a self-supporting mode. It is a block diagram which shows the prior art example 1 of a PBX backup system. It is a block diagram which shows the prior art example 2 of a PBX backup system. It is a block diagram which shows the prior art example 3 of a PBX backup system.

  Next, embodiments for carrying out the invention will be described in detail with reference to the drawings. FIG. 1 shows a basic configuration of a PBX backup system according to the present invention. This PBX backup system includes a center site 10 where the hosted VoIP server 100 is installed, a local site 20-1 where the terminal device 30-1 is installed, and a local site 20-2 where the terminal device 30-2 is installed. Connected via a network 40, a local server 200-1 is installed at the local site 20-1, and a local server 200-2 is installed at the local site 20-2. The number of local bases and the number of terminal devices in the local base are merely examples.

  The hosted VoIP server 100 controls the call state transition between terminal devices in the same site and outside the same site via the local server 201 or the local server 202, and has data necessary for this. An operation mode in which the hosted VoIP server 100 controls the call state transition is called a hosted mode. For example, when you raise the handset of the caller, you can hear a dial tone, and when you start to specify the destination phone number, the dial tone stops. When you finish specifying the destination phone number, A ringing tone or a ringing tone from a receiver at the destination is called, and such a call state transition is called a call state transition.

  The local server 201 accommodates the terminal device 30-1, has data necessary for call connection of the terminal device 30-1, and directly transfers the call state transition between the terminal devices 30-1 in the local base 20-1. Control. Furthermore, the call state of the terminal device 30-1 is held. Similarly, the local server 30-2 accommodates the terminal device 30-2, has data necessary for call connection of the terminal device 30-2, and handles calls between the terminal devices 30-1 in the local base 20-1. Control state transitions. Furthermore, the call state of the terminal device 30-2 is held.

  In this PBX backup system, the call connection between the terminal devices is the state of the call held by the local servers 200-1 and 200-2, the event detection of the terminal devices 30-1 and 30-2, and the hosted VoIP server. Established by state transition control of 100 calls. In such a system, when a failure occurs in the network 40 and the network 40 is disconnected, or when a failure occurs in the hosted VoIP server 100, call state transition control necessary for call connection is controlled from the hosted VoIP server 100. When switching to the local server 200-1 or 200-2 and communication between terminal devices within the same base, the local server performs call state transition control, so that the call connection between the terminal devices 30-1 and 30-2 Establish. An operation mode in which the local server performs call state transition control is referred to as an independent mode.

  FIG. 2 shows Example 1 of the PBX backup system according to the present invention. In this PBX backup system, a center base 10, a local base 20-1, and a local base 20-2 are connected by an IP network 41 and a public network 42. A hosted VoIP server 100 is installed at the center site 10. A local server 200-1, an IP terminal 301-1, and a legacy terminal 302-1 are installed at the local base 20-1, and a local server 200-2, an IP terminal 301-2, and a legacy terminal 302 are installed at the local base 20-2. -2 is installed. The hosted VoIP server 100 is connected to the local servers 200-1 and 200-2, the IP terminals 301-1 and 301-2, and the legacy terminals 302-1 and 302-2 via the IP network 41 and the public network 42. Can be done.

  The local server 200-1 accommodates the IP terminal 301-1 and the legacy terminal 302-1 and has data necessary for call connection between the IP terminal 301-1 and the legacy terminal 302-1. And the call status of the legacy terminal 302-1. The local server 200-2 accommodates the IP terminal 301-2 and the legacy terminal 302-2, has data necessary for call connection between the IP terminal 301-2 and the legacy terminal 302-2, and further includes the IP terminal 301-2. And the call status of the legacy terminal 302-2. When the hosted VoIP server 100 is down or the IP network 41 is disconnected, the local server 200-1 is between the IP terminal 301-1 and the legacy terminal 302-1, and the local server 200-2 is the IP terminal 301. Controls call state transition between -2 and legacy terminal 302-2.

  The hosted VoIP server 100 controls the state transition of calls among the IP terminal 301-1, the legacy terminal 302-1, the IP terminal 301-2, and the legacy terminal 302-2, and the line control unit 110 and the operation management server unit 120 It is configured. The line control unit 110 controls the call state transition between the IP terminals 301-1 and 301-2 and the legacy terminals 302-1 and 302-2. In preparation for failure of the line control unit 110, the line control unit 110-1 and the line control unit 110-2 are redundantly provided. The operation management server unit 120 has a function for centrally storing station data necessary for call connection at the local bases 20-1 and 20-2 and a function for transmitting station data to the local servers 200-1 and 200-2. Have.

  The local server 200-1 stores station data necessary for call connection between the IP terminal 301-1 and the legacy terminal 302-1, and the local server 200-2 stores the call between the IP terminal 301-2 and the legacy terminal 302-2. Stores station data required for connection. The local servers 200-1 and 200-2 check whether communication with the hosted VoIP server 100 is possible. Hereinafter, the case where communication is possible / impossible and the case where communication is inside / outside the local base will be described separately.

  When a call is made from the IP terminal 301-1 to the legacy terminal 302-1 in the same local site 20-1 while the hosted VoIP server 100 and the local server 200-1 are communicable, the local server 200-1 The request signal is transmitted and received by the line control unit 110 of the hosted VoIP server 100 via the IP network 41. The line control unit 110 that has received the call request signal refers to the station data held by the operation management server unit 120 and performs a call state transition to the local server 200-1 via the IP network 41. A call request signal is transmitted. The local server 200-1 that has received the call request signal issues a call request to the legacy terminal 302-1 and enables communication between the IP terminal 302-1 and the legacy terminal 302-1. The same applies when a call is made from the IP terminal 301-1 to, for example, the IP terminal 301-2 outside the local site 20-1.

  Here, it is assumed that a failure occurs in the IP network 41 and communication between the hosted VoIP server 100 and the local servers 200-1 and 200-2 becomes impossible. The local servers 200-1 and 200-2 sense that this communication has become impossible, and instead of the hosted VoIP server 100, the local servers 200-1 and 200-2 enter an independent mode in which they control call state transition.

  In this state, when a call is made from the IP terminal 301-1 to, for example, the legacy terminal 302-1 in the same local site 20-1, the local server 200-1 accommodating the IP terminal 301-1 sends a call request signal. After reception, the local server 200-1 determines that communication with the hosted VoIP server 100 is not possible, the local server 200-1 makes a call request to the legacy terminal 302-1, and the IP terminal 301-1 and the legacy terminal 302 -1 communication is possible. Further, communication from the IP terminal 301-1 to the IP terminal 301-2 or the legacy terminal 302-2 outside the local site 20-1 is possible via the public network 42.

  If a failure occurs in the hosted VoIP server 100 and the hosted VoIP server 100 and the local servers 200-1 and 200-2 cannot communicate, communication between terminal devices in the same local base fails in the IP network 41. It is the same as the case where this occurs. In addition, communication between terminal devices outside the same local base can continue the current call via the IP network 41 or public network 42 if no failure has occurred.

  In FIG. 1, when a terminal device is also installed at the center base 10, the terminal device can be accommodated by installing a local server at the center base 10. It is also conceivable to add a local server function to the hosted VoIP server 100 to physically accommodate the terminal device in the center base 10 without installing an independent local server.

  Since this system is configured such that the terminal device is not accommodated by the hosted VoIP server, the legacy terminal can be accommodated in the local server without an IP converter.

  FIG. 3 shows details of the hosted VoIP server 100, the local server 200, and the terminal device 30. The local server 200 represents the local servers 200-1 and 200-2 in FIGS. 1 and 2, and the terminal device 30 is the terminal devices 30-1 and 30-2 in FIG. 1 and the IP terminals 301-1 and 301- in FIG. 2 and legacy terminals 302-1 and 302-2.

  The operation management server unit 120 of the hosted VoIP server 100 is a station data storage that centrally manages station data, that is, terminal device data and control data necessary for call connection of the terminal device 30 accommodated in the local server 200. Means 121 and station data transmission means for reading out and distributing to the local server 200 only the part necessary for call control of the terminal device 30 accommodated in the local server 200 among the station data held in the station data storage means 121 122.

  The line control unit 110 includes a hosted mode call state transition control unit 111 that controls a call state transition of the terminal device 30 during hosted mode operation, and a state monitoring signal unit 112 that periodically transmits a state monitoring signal to the local server 200. Prepare. When the hosted mode call state transition control unit 111 receives the call state of the originating terminal device and the content of the generated event from the local server 200 as described later, the station data stored in the station data storage unit 121 is received. The local server that accommodates the destination terminal device is identified, and the call status of the destination terminal device is read from the local server. Then, the state of the call to be transitioned is determined from the state of the call at the destination, and the state transition is controlled by issuing a call connection request processing instruction to each of the local server at the transmission source and the local server at the destination.

  In the terminal device 30, various events occur due to operations such as raising the handset, turning the dial, and pressing the hold button. In order for the terminal device 30 to establish a call connection with another terminal device, the event of the terminal device 30 is detected by the local server 200, the call state is maintained, and when the hosted mode is operating, the hosted VoIP server 100 A call connection with the terminal device of the other party is established by the state transition of the call by the line control unit 110. The terminal device 30 includes a terminal event transmission unit 31 that transmits an event to the local server 200, and a terminal control instruction reception unit 32 that receives a terminal control instruction from the local server 200.

  The local server 30 receives the station data from the station data transmission unit 122 of the hosted VoIP server 100, the state monitoring signal from the state monitoring signal transmission unit 112 of the hosted VoIP server 100, and the event from the terminal event transmission unit 31 of the terminal device 30. The hosted mode and the independent mode are switched by control by the call state transition control unit 111 of the hosted VoIP server 100.

  The station data receiving means 21 receives the station data distributed from the station data transmitting means 112 and stores it in the station data storage means 22. The state monitoring unit 23 receives the state monitoring signal from the state monitoring signal transmission unit 112 and writes the state whether or not the communication with the hosted VoIP server 100 is normal in the state monitoring storage unit 24. The state monitoring signal is transmitted from each of the redundant line controllers 110, 110-1, and 110-2. When the terminal device event detection unit 25 detects an event from the terminal device event transmission unit 31, the terminal device event detection unit 25 inputs the event content to the state monitoring storage unit 26 and transmits the event content to the call connection control unit 27.

  The call connection control switching means 27 determines whether or not communication with the hosted VoIP server 100 is possible based on the contents stored in the state monitoring storage means 24. When communication is possible, when the event content is received, the call connection control switching unit 27 displays the event content and the call state of the terminal device of the transmission source stored in the terminal device state monitoring storage unit 26 of the hosted VoIP server 100. It transmits to the hosted mode call state transition control means 111. On the other hand, when communication is impossible, the call connection control switching unit 27 transmits the event contents and the call state of the caller terminal device to the independent mode call state transition control unit 28 in the local server 30.

  When the autonomous mode call state transition control means 28 receives the call state and event contents of the caller terminal device from the call connection control switching means 27, the station data storage means 22 is referenced to identify the callee terminal device. Thereafter, a call state transition is performed and a control signal is transmitted to the terminal control instruction receiving means 32 of the terminal device 30, and then the call state of the terminal device is written in the terminal device state storage means 26 to establish a call connection.

  Upon receiving the call connection instruction signal from the hosted mode call state transition control means 111, the terminal device read / call connection request processing instruction means 29 transmits the call connection instruction signal to the terminal control instruction reception means 32 of the terminal device 30. At the same time, a request for writing the call state of the terminal device based on the call connection instruction signal in the terminal device state storage means 26 is issued.

  When the terminal device state storage means 26 receives the above request from the terminal device read / call connection request processing instruction means 29, the terminal device call state, terminal device event detection means 25 from the independent mode call state transition control means 28 The event content from is input and stored. The call state and event contents of the terminal device can be read to the call connection control means 27 and to the hosted mode state transition control means 111 via the terminal device read / call connection request processing instruction means 29.

  Next, the operation of the PBX backup system configured as described above will be described.

  The station data storage means 22 stores as much station data as necessary for the call control of the terminal device 30, and the server status monitoring means 23 receives the status monitoring signal from the status monitoring signal transmitting means 112, The status monitoring storage means 24 writes the status of whether or not communication with the hosted VoIP server 100 is normal. The call connection control switching means 27 determines whether or not communication with the hosted VoIP server 100 is possible based on the contents stored in the state monitoring storage means 24. That is, if the state monitoring signal can be received within a certain time, the communication is determined to be normal, and the communication is determined to be abnormal when a timeout occurs. As a result, the local server 30 confirms whether or not signal transmission / reception with the hosted VoIP server 100 is possible.

  When communication is possible, the hosted mode is set. Various events occur in the terminal device 30. When the terminal device event detection unit 25 detects the event, the call connection control switching unit 27 refers to the call state of the terminal device stored in the state monitoring storage unit 26, and the contents of the event and the source terminal device The call state is transmitted to the hosted mode call state transition control means 111 (step A1 in FIG. 4). When the hosted mode call state transition control unit 111 receives the event content and the call state of the terminal device of the transmission source, the hosted mode call state transition control unit 111 refers to the station data held in the station data storage unit 121 and accommodates the destination terminal device. The local server is identified (step A2 in FIG. 4), and the call state of the destination terminal device is read from the terminal device state storage means 26 of the local server (step A3 in FIG. 4).

  Then, the state of the call to be transitioned is determined from the state of the call at the destination (step A4 in FIG. 4), the state of the call is changed (step A5 in FIG. 4), the source local server and the destination A call connection request processing instruction is sent to the terminal device read / call connection request processing instruction means 29 of each local server (step A6 in FIG. 4). As described above, the call state transition control in the hosted mode is performed by the hosted mode call state transition control means 111.

  The terminal device read / call connection request processing instruction means 29 of each of the source local server and the destination local server transmits a call connection instruction signal to the terminal control instruction receiving means 32 of the terminal device 30 (step of FIG. 4). At the same time, a request for writing the call status of the terminal device based on the call connection instruction signal in the terminal device status storage means 26 is issued and written (step A8 in FIG. 4). The terminal device 30 that has received the call connection instruction signal operates in accordance with the instruction signal and establishes a call state transition (step A9 in FIG. 4). In the hosted mode, the call state transition is controlled in this way.

  On the other hand, when a failure occurs in the IP network 41 or the hosted VoIP server 100, the call connection control by the hosted mode call state transition control means 111 becomes impossible. The call connection control switching means 27 transmits the event contents and the call state of the caller terminal device to the independent mode call state transition control means 28 (step B1 in FIG. 5). When the autonomous mode call state transition control means 28 receives the event contents and the call state of the originating terminal device, it refers to the station data necessary for call control of the local site from the station data storage means 22, and After the terminal device is specified (step B2 in FIG. 5), the call state transition is performed (step B3 in FIG. 5), and a call connection instruction signal is transmitted to the terminal control instruction receiving means 32 (step B4 in FIG. 6). Thereafter, the call state of the terminal device is written in the terminal device state storage means 26 (step B5 in FIG. 5). Receiving the call connection instruction signal, the terminal device 30 operates in accordance with the instruction signal and establishes a call state transition (step B6 in FIG. 5).

  If the destination server is identified by referring to the station data (step A2 in FIG. 4) and the destination terminal device is found to be another site, the destination is transmitted via the public network 42. The call state transition of the counterpart legacy terminal is performed by the independent mode call state transition control means 28 of the local server in which the destination legacy terminal is accommodated, and the destination terminal device is specified. Establish.

  If a failure occurs in the hosted VoIP server 100 but the IP network 41 is normal, communication between terminal devices at different bases is performed between the IP terminals via the IP network 41 as far as the call is concerned. It is possible to maintain at.

  Thus, the hosted VoIP server 100 has only a function for controlling call connection, and the local server 200 has a minimum call connection function and a terminal state storage function at the time of failure. The necessary minimum is the amount necessary for the call connection of the terminal device 30 accommodated in the local server 200. By limiting the functions of the hosted VoIP server 100 and the local server 200, a low-cost system can be constructed.

  In addition, call state transition control in the event of a failure of the IP network 401 is performed by the independent mode call state transition control means 28 of the local server 200. Since the local server 200 accommodates the terminal device and stores the station data in advance and grasps the state of the call of the terminal device, the call state is immediately obtained without requiring transmission from the hosted VoIP server 100. Transition control can be switched.

  In addition, when viewed from the terminal device side, in either the hosted mode or the self-sustained mode, the call state transition control is directly received only from the local server 200, so the terminal communicates with a plurality of servers. Compared with the device, it becomes cheaper. In particular, when a large-scale system having a large number of terminals is constructed, this advantage is expanded.

  Thereafter, when the failure of the IP network 41 or the hosted VoIP server 100 is recovered and the communication between the hosted VoIP server 100 and the local server 200 is resumed, the state monitoring means 23 receives the state monitoring signal, and communication with the hosted VoIP server 100 is established. It is stored in the state monitoring storage means 24 that it is possible. Communication between the terminal devices is continued under the call state transition control by the local server 200 as it is.

  When the local server 200 detects the next event, the hosted VoIP server 100 hosted mode call state transition control is performed via the terminal device read / call connection request processing instruction means 29 for the terminal device call state and event contents. Transmit to means 111. As a result, the call state transition control is switched from the local server 200 to the hosted VoIP server 100 while maintaining communication. Since only the call state of the terminal device that caused the event and the event content are transmitted from the local server 200 to the hosted VoIP server 100, the network traffic does not increase so much, and the network with a narrow communication bandwidth is used. It ’s enough.

  As described above, the call state transition is controlled by the call connection control switching unit 27 by the hosted mode call state transition control unit 111 or the independent mode call state transition control unit 28, thereby determining the IP network. Ensure call connection in case of network failure.

  Note that the PBX backup system can be applied to P2P connections. If this PBX backup system is applied to P2P connection and a hosted VoIP server failure occurs during communication between terminal devices in the same base, or if an IP network failure occurs, the local server holds it in advance. Communication is maintained by the call state transition of the local terminal device and the call state transition control of the local server. Also, if the hosted VoIP server goes down during communication of terminal devices between different bases, the communication will not be disconnected if the IP network between the bases where the respective terminal devices are communicating can be connected. Maintained.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

  (Appendix 1) In a PBX backup system in which a plurality of local bases and a center base are connected via a network, a hosted VoIP server that controls call state transition between terminal devices inside and outside the local base is installed in the center base. In each of the local bases, a terminal device and a local server that relays the result of the call state transition control by the hosted VoIP server to the terminal device are installed, and when a failure occurs in the network or the hosted VoIP server, A PBX backup system characterized in that a call state transition between terminal devices in the same local base is switched to be performed by the local server.

  (Supplementary Note 2) The local server stores station data (terminal device data and control data) distributed from the hosted VoIP server and necessary for call connection of the terminal device accommodated by the local server. A storage device, a terminal device state storage device for storing a state of a call of the terminal device accommodated in the local server, and a content of an event that has occurred in the terminal device; A terminal device read / call connection request processing instruction for transmitting a call connection instruction signal to the terminal device upon receiving a call connection instruction signal from the hosted VoIP server, reading out the status and event contents and transmitting them to the hosted VoIP server Means, and when receiving the call state and event contents of the originating terminal device, the destination terminal device is identified by referring to the station data storage means. Thereafter, after the call state transition is performed and the call connection instruction signal is transmitted to the terminal device, the call state of the terminal device is written in the terminal device state storage means, and the independent mode call state transition control means for establishing the call connection And determining whether or not communication with the hosted VoIP server is possible, and receiving the event content from the terminal device, the terminal device of the transmission source stored in the event content and the terminal device state monitoring storage means Call connection control switching means for transmitting the call status to the hosted VoIP server when communication is possible, and to the autonomous mode call state transition control means when communication is impossible. 1. The PBX backup system according to 1.

  (Supplementary note 3) The PBX backup system according to supplementary note 2, wherein the hosted VoIP server centrally manages the station data of all terminal devices.

  (Supplementary Note 4) Whether the failure described in Supplementary Note 1 or the communication described in Supplementary Note 2 is possible is determined by sending a status monitoring signal periodically transmitted from the hosted VoIP server to the local server for a certain period of time. The PBX backup system according to appendix 1 or appendix 2, wherein the PBX backup system is determined based on whether or not data can be received.

  The present invention can be applied to networks and systems that provide telephone services over an IP network.

10 Center locations
20 Local locations
21 Station data receiving means
22 Station data storage means
23 Condition monitoring means
24 Condition monitoring storage means
25 Terminal device event detection means
26 Terminal device status storage means
27 Call connection control means
28 Independent mode call state transition control means
29 Terminal device read / call connection request processing instruction means
30 Terminal equipment
31 Terminal event transmission means
32 Terminal control instruction receiving means
40 network
41 IP network
42 Public network
100 hosted VoIP servers
110 Line control unit
111 Hosted mode call state transition control means
112 Status monitoring signal transmission means
120 Management Server
121 Station data storage means
122 Station data transmission means
200 local server
301 IP terminal
302 Legacy terminal

Claims (4)

In a PBX backup system in which multiple local bases and center bases are connected via a network.
In the center base, a hosted VoIP server for controlling the call state transition between terminal devices inside and outside the local base is installed,
In each local base, a terminal device and a local server that relays the result of the call state transition control by the hosted VoIP server to the terminal device are installed,
When a failure occurs in the network or the hosted VoIP server, a call state transition between terminal devices in the same local base is switched so as to be performed by the local server. The local server is
Station data storage means for storing station data (terminal device data and control data) required for call connection of the terminal device accommodated in the local server, delivered from the hosted VoIP server,
A terminal device state storage means for storing a call state of a terminal device accommodated in the local server and contents of an event that has occurred in the terminal device;
When the terminal device state storage means reads out the call state and event contents of the terminal device and transmits them to the hosted VoIP server, and receives a call connection instruction signal from the hosted VoIP server, the call connection instruction signal is transmitted to the terminal device. Terminal device reading / call connection request processing instruction means for transmitting to
Upon receiving the call state and event contents of the terminal device of the transmission source, the terminal device is referred to the station data storage means, and then the terminal device of the call destination is specified, and then the call state transition is performed and the call connection instruction signal is transmitted A self-standing mode call state transition control means for writing a call state of the terminal device in the terminal device state storage means and establishing a call connection;
When it is determined whether or not communication with the hosted VoIP server is possible, and the event content from the terminal device is received, the call of the source terminal device stored in the event content and the terminal device state monitoring storage means is stored. 2. Call connection control switching means for transmitting the state of the communication to said hosted VoIP server when communication is possible, and to said autonomous mode call state transition control means when communication is impossible. The PBX backup system described in 1.   The PBX backup system according to claim 2, wherein the hosted VoIP server centrally manages the station data of all terminal devices.   Whether or not the failure according to claim 1 or the communication according to claim 2 is possible is determined by sending a status monitoring signal periodically transmitted from the hosted VoIP server to the local server within a certain period of time. The PBX backup system according to claim 1, wherein the PBX backup system is determined based on whether or not the data can be received.

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