JP4762602B2 - Extension telephone system - Google Patents

Description

  The present invention includes a private branch exchange (hereinafter simply referred to as PBX) connected to a communication network such as an IP network, and a plurality of remote devices that connect to the communication network and accommodate and connect a plurality of extension terminals. The present invention relates to an extension telephone system in which an extension terminal accommodated and connected to a remote device is centrally managed by a main controller on the private branch exchange side.

  Conventionally, as such an extension telephone system, for example, a plurality of remote devices are remotely located in an area geographically distant from the head office, and telephones respectively accommodating and connecting to the plurality of remote devices are used as extension telephones, for example, at the head office. A system is widely known that centrally manages the arranged PBX on the main control device side and enables call connection between extension telephones existing in different regions (for example, see Patent Document 1).

  In addition, the present applicant arranges a remote device for each site in such an extension telephone system, and arranges a backup PBX for each site. When the line status with the PBX is normal, the remote device The PBX's communication path control, that is, the extension telephones can be connected to each other under the main control unit on the PBX side, and when a line failure with the PBX is detected, the connection to the PBX is established. Is connected to the communication path of the backup PBX, and the communication path control of the backup PBX, that is, a system in which extension telephones can be connected to each other under the main controller on the backup PBX side is proposed. (For example, refer to Patent Document 2).

According to such an extension telephone system of Patent Literature 2, when a line failure with the PBX is detected on the remote device side, the communication path connection with the PBX is disconnected and connected with the communication path of the backup PBX. Since the extension telephones can be connected to each other under the main control unit on the PBX side, even if a line failure occurs between the remote unit and the PBX, the remote unit is accommodated under the main control unit on the backup PBX side. The extension telephone to be connected can be operated.
Japanese Patent Laid-Open No. 2003-258873 (see abstract and FIG. 1) Japanese Patent Application No. 2004-249048 (see paragraph numbers “0037” to “0058” and FIGS. 7 to 10)

  According to the extension telephone system of Patent Document 2, one remote device is arranged at each site, and even if a line failure occurs between the remote device and the PBX, the same operation is performed under the main control device on the backup PBX side. Extension telephones that can be accommodated and connected to remote devices can be connected, but the number of extension phones that can be accommodated and connected to the remote devices is limited. In this case, even in the same group of extension telephones, the remote devices that accommodate and connect the extension telephones are different.

  However, when the extension telephones of the same group are accommodated and connected by a plurality of remote devices, a line failure with the PBX is detected on one of the remote devices, and the remote device detects the PBX for backup. Even if it is switched to the main controller on the remote side, the other remote devices in the same group operate under the control of the main controller on the PBX side, so the communication network differs for each remote device. As a result, even if the extension telephones are in the same group, it may be impossible to establish a call connection between the extension telephones in the same group.

The present invention has been made in view of the above point, line and it is an object of the plurality of remote devices for receiving connecting extension phones in the same group (internal terminals), and PBX at least single An object of the present invention is to provide an extension telephone system that enables a call connection between extension terminals in the same group even if a failure occurs.

In order to achieve the above object, an extension telephone system of the present invention includes a first private branch exchange that performs call control between a plurality of extension telephones via a communication network , and the first private branch exchange via the communication network. A plurality of remote devices that are connected to the plurality of extension telephones and relay the signals of the extension telephones to and from the communication network, and are connected to each of the plurality of remote apparatuses via signal lines. Te extension telephone system odor and a second private branch exchange, the remote device, a communication network interface unit is an interface with the communication network, the extension telephone, said first through said communication network interface unit Packet transmission / reception between the private branch exchange or the switching unit connected to either the second private branch exchange and the first private branch exchange via the communication network A remote side fault monitoring unit that monitors whether there is a fault, the second private branch exchange is connected to the switching unit of the plurality of remote devices, and a communication path is established between the plurality of remote devices. A switch to be set, and when the first remote device detects a failure in the remote-side failure monitoring unit, the switching unit is connected from the communication network interface unit to the switch of the second private branch exchange. Change and send a switching request via the communication network via the communication network interface unit to the second remote device belonging to the same group as the first remote device,
The second remote device is
When the switching request is received from the communication network, the connection of the switching unit is changed from the communication network interface unit to the switch of the second private branch exchange .

In the extension telephone system of the present invention, the first private branch exchange includes a failure monitoring unit that transmits and receives packets to and from the remote device via the communication network and monitors whether there is a failure. When one of the private branch exchanges detects a failure in communication with the first remote device, the failure monitoring unit connects the communication network to the second remote device belonging to the same group as the first remote device. A switching request is sent via

In the extension telephone system of the present invention, when the second remote device receives the switching request from the first remote device, it is determined whether or not the connection of the switching unit has already been changed to the switch. When it is determined that it has not been changed, the connection of the switching unit is changed from the communication network interface unit to the switch of the second private branch exchange .

In the extension telephone system of the present invention, the first private branch exchange transmits a switch-back request to the first remote device and the second remote device after a predetermined time has elapsed after recovery from the failure. Then, the first remote device and the second remote device that have received the switchback request change the connection of the switching unit from the second private branch exchange to the communication network interface unit, respectively. .

  According to the extension telephone system of the present invention configured as described above, when the remote device detects a line failure between another remote device in the same group and the private branch exchange, the communication path with the private branch exchange The connection is disconnected and connected to the communication path of the backup private branch exchange, and the extension terminals can be connected to each other on the basis of the communication path control of the backup private branch exchange. When one of the devices detects a line failure with a private branch exchange, all remote devices in the same group are connected to the communication path of the backup private branch exchange, and the same communication network using the same backup private branch exchange is used. Multiple remote devices that accommodate and connect extension terminals in the same group, because extension terminals in the same group can be connected to each other. Even if at least one line failure with a private branch exchange occurs, all remote devices in the same group can be configured with the same communication network using a private branch exchange for backup. Call connection between extension terminals becomes possible.

  According to the extension telephone system of the present invention, when a line failure with a private branch exchange is detected on the remote device side, a switching request signal is output to another remote device in the same group as the remote device, When the switching request signal is detected by a remote device, the call path connection with the private branch exchange is disconnected and connected to the call path of the backup private branch exchange, and based on the call path control of the backup private branch exchange, the extension Since terminals can be connected to each other, even if at least one of a plurality of remote devices accommodating and connecting extension terminals in the same group has a line failure with a private branch exchange, the remote device All remote devices in the same group based on the switch request signal of the same communication network using the same private branch exchange It can be configured.

  According to the extension telephone system of the present invention, when a line failure with the remote device is detected on the private branch exchange side, a switching request signal is output to another remote device in the same group as the remote device, When the switching request signal is detected from the private branch exchange by the remote device, the communication path connection with the private branch exchange is disconnected and the communication path of the backup private branch exchange is disconnected. Based on the above, since the extension terminals can be connected to each other, even if at least one of the plurality of remote devices accommodating and connecting the extension terminals in the same group has a line failure with the private branch exchange, Based on the switching request signal from the private branch exchange, all remote devices in the same group are the same using the private branch exchange for backup. It can be configured by a communication network.

  According to the extension telephone system of the present invention, when the switchback request signal from the private branch exchange is detected on the remote device side, the communication path connection with the backup private branch exchange is disconnected and the communication path of the private branch exchange is Based on the communication path control of the private branch exchange, the extension terminals can be connected to each other so that all remote devices in the same group detect the switchback request signal from the private branch exchange. Returning to the communication network before the failure, as a result, the extension terminals in the same group can be connected to each other by the same communication network using the private branch exchange.

  According to the extension telephone system of the present invention, for example, attention is paid to the fact that fluctuations occur immediately after failure recovery and the line state becomes unstable, and when a predetermined time elapses after failure recovery by the private branch exchange, Since the return request signal is output to the remote device, all remote devices in the same group can be returned to the communication network before the line failure in a stable state.

  Hereinafter, an extension telephone system showing an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration inside the extension telephone system showing the present embodiment.

  The extension telephone system 1 shown in FIG. 1 is arranged at a site A side switching system 2 located at a site A, a site B side switching system 3 located at a site B remote from the site A, and the site C, for example. The site C side switching system 4 and the site A side switching system 2, the site B side switching system 3, and the site C side switching system 4 are connected to each other.

  The site A side switching system 2 includes a plurality of site A side telephones 11 and site A side radio base stations 12, a site A side HUB 13 that controls a communication interface with the IP network 5, and the plurality of site A side telephones 11 and sites. The A-side radio base station 12 is accommodated and connected, and has a site A-side PBX 14 connected to the site A-side HUB 13.

  The site B side switching system 3 includes a site B side HUB 21 that controls a communication interface with the IP network 5, a first remote device 22A and a second remote device 22B connected to the site B side HUB 21, and a first remote device. A plurality of site B side first telephones 23A and site B side first radio base stations 24A managed on the 22A side, and a plurality of site B side second telephones 23B and site B side second managed on the second remote apparatus 22B side A radio base station 24B and a backup PBX 25 are provided.

  The site B side first telephone 23A and the site B side first radio base station 24A managed on the first remote apparatus 22A side, and the site B side second telephone 23B and site managed on the second remote apparatus 22B side It is assumed that the same group number is assigned to the B-side second radio base station 24B as the same group.

  Further, although not shown, the site C side switching system 4 includes a site C side HUB, a first remote device, a second remote device, a site C side first telephone, a site C side first radio base station, and a site C side first station. It is assumed that it is composed of two telephones, a site C side second radio base station, and a backup PBX.

  FIG. 2 is a block diagram showing a schematic configuration inside the site A side PBX 14.

  The site A side PBX 14 shown in FIG. 2 includes an extension telephone IF unit 31 that controls a communication interface with the site A side telephone 11, a radio base station IF unit 32 that controls a communication interface with the site A side radio base station 12, and The extension IF control unit 33 that controls the communication control interface of the extension telephone IF unit 31 and the radio base station IF unit 32, the IP network IF unit 34 that controls the communication interface with the site A side HUB 13, and the communication of this IP network IF unit 34 An IP network IF control unit 35 that controls the control interface, a speech path switch unit (hereinafter simply referred to as SW unit) 36 that forms a speech path between the extension IF control unit 33 and the IP network IF control unit 35, and an IP network IF The first remote device 22A or the second remote device 22 in the site B side switching system 3 (site C side switching system 4) through the unit 34 A failure monitoring unit 37 that monitors a line failure for the network, a clock information holding unit 38 that manages clock information such as a recovery start time, which will be described later, and a main controller 39 that controls the entire site A side PBX 14. .

  The IP network IF unit 34 includes telephones and radio base stations connected to the extension telephone system 1, for example, the site A side telephone 11 and the site A side radio base station 12, the site B side first telephone 23A and the site B side. Identification information for identifying the second telephone 23B, the site B side first radio base station 24A, the site B side second radio base station 24B, etc., and the site A side telephone 11 and the site A side accommodated and connected to the site A side PBX 14 A conversion table 34A is provided that stores and manages the IP address of the radio base station 12 and the IP addresses of the first remote device 22A and the second remote device 22B that manage the telephone and the radio base station in association with each other.

  When the IP network IF unit 34 receives an IP packet addressed to itself from the IP network 5 through the site A side HUB 13, the IP network IF unit 34 extracts a signal added with identification information from the IP packet and outputs the signal to the IP network IF control unit 35. At the same time, when a signal added with identification information input from the IP network IF control unit 35 is received via the SW unit 36, the signal is converted into an IP packet, and an IP address corresponding to the identification information is read from the conversion table 34A. The IP packet is output to the IP network 5 with the address as the destination.

  In addition, the failure monitoring unit 37 transmits life check IP packets to the first remote device 22A and the second remote device 22B of each switching system via the IP network 5 at predetermined intervals, and for this life check. The line status between the site A side PBX 14 and the first remote device 22A based on the determination result of whether or not the IP packet for response to the IP packet is received from the first remote device 22A or the second remote device 22B, or the site The line state between the A side PBX 14 and the second remote device 22B is determined. That is, when the failure monitoring unit 37 receives a response IP packet from the first remote device 22A (second remote device 22B), the failure monitoring unit 37 communicates between the site A side PBX 14 and the first remote device 22A (second remote device 22B). It is determined that the line status is normal.

  The failure monitoring unit 37 outputs the IP packet for life check as a retry operation up to two times when the IP packet for response to the IP packet for life check cannot be received. Therefore, when the failure monitoring unit 37 cannot receive the response IP packet for the second retry operation from the first remote device 22A (second remote device 22B), the site A side PBX 14 and the first remote device 22A ( It is determined that the line state between the second remote devices 22B) is a failure.

  Further, when the failure monitoring unit 37 detects a line failure between the site A side PBX 14 and the first remote device 22A, it outputs an IP packet for a switching request signal to the second remote device 22B in the same group via the IP network 5. In addition, when a line failure between the site A side PBX 14 and the second remote device 22B is detected, an IP packet for a switching request signal is output to the first remote device 22A in the same group via the IP network 5. .

  Further, the IP network IF unit 34 has a clock function, and when the recovery start time after recovery from the line failure stored in the clock information holding unit 38 is reached, the first remote device 22A and the second remote device 22 are connected via the IP network 5. An IP packet of a switchback request signal is output to the device 22B. The recovery start time stored in the clock information holding unit 38 is based on user input.

  FIG. 3 is a block diagram showing a schematic configuration inside the first remote device 22A (second remote device 22B) and backup PBX 25 inside the site B side switching system 3. As shown in FIG.

  The backup PBX 25 shown in FIG. 3 includes a site B side first extension telephone IF unit 41A that controls the communication interface of the site B side first telephone 23A, and a site B side that controls the communication interface of the site B side first radio base station 24A. A first radio base station IF unit 42A, a site B side first extension IF control unit 43A that controls a communication control interface of the site B side first extension telephone IF unit 23A and the site B side first radio base station IF unit 24A; A site B side second extension telephone IF unit 41B that controls the communication interface of the site B side second telephone 23B, and a site B side second radio base station IF unit 42B that controls the communication interface of the site B side second radio base station 24B; The communication control interfaces of the site B side second extension telephone IF unit 41B and the site B side second radio base station IF unit 42B Site B side second extension IF control unit 43B, site B side first extension IF control unit 43A and site B side at the time of a line failure between the site A side PBX 14 and the first remote device 22A (or second remote device 22B) A backup communication path switch section (hereinafter simply referred to as a backup SW section) 44 that forms a communication path with the second extension IF control section 43B, and a backup main controller 45 that controls the entire backup PBX 25 Have.

  Further, the first remote device 22A shown in FIG. 3 includes a remote-side IP network IF unit 51 that controls a communication interface with the site B-side HUB 21 and a remote-side IF control that controls a communication control interface with the remote-side IP network IF unit 51. Based on the switching control of the remote side failure monitoring unit 53, the remote side failure monitoring unit 53 that monitors the line failure between the unit 52, the site A side PBX 14, and the site B side first extension IF control unit 43A in the backup PBX 25 And a remote-side switching unit 54 for switching and connecting the remote-side IF control unit 52 and the backup SW unit 44 to the site B-side second extension IF control unit 43B.

  The remote-side IP network IF unit 51 includes telephones and radio base stations connected to the extension telephone system 1, such as a site A-side telephone 11 and a site A-side radio base station 12, a site B-side first telephone 23A, and a site B. Side identification telephone set 23B, site B side first radio base station 24A, site B side second radio base station 24B, etc., respectively, and site A side telephone 11 and site A accommodating and connecting to site A side PBX 14 The remote side conversion table 51A is provided that stores and manages the IP address of the side radio base station 12 and the IP addresses of the first remote device 22A and the second remote device 22B that manage the telephone and the radio base station in association with each other. .

  When the remote-side IP network IF control unit 51 receives an IP packet addressed to itself from the IP network 5 through the site B-side HUB 21, the remote-side IF network control unit 51 extracts a signal with identification information added from the IP packet. When the signal with the identification information input from the remote side IF control unit 52 is received, the signal is converted into an IP packet, and the IP address corresponding to the identification information is read from the remote side conversion table 51A. The IP packet is output to the site B side HUB 21 with the address as the destination.

  In addition, the remote-side IF control unit 52 converts the signal input from the remote-side IP network IF unit 51 into identification information added to the signal via the remote-side switching unit 54 and the site B-side first extension IF control unit 43. Output to the site B side first extension telephone IF unit 41A, the site B side first radio base station IF unit 42A, etc. specified based on the site B side first extension telephone IF unit 41A and the site B side first radio base When a signal input from the station IF unit 42A is received, output source identification information is added to the signal and output to the remote-side IP network IF unit 51.

  The signal lines 101A between the site B side first extension IF control unit 43A and the remote side switching unit 54 are signal lines between the remote side IF control unit 52 and the remote side switching unit 54 in the first remote device 22A. It is assumed that the signal line 103 </ b> A between the remote side switching unit 54 and the backup SW unit 44 is also connected in association with the connection 102 </ b> A. Similarly, each signal line 101B between the remote side switching unit (not shown) in the second remote device 22B and the site B side second extension IF control unit 43B is connected to the remote side IF in the second remote device 22B. The signal lines between the control unit (not shown) and the remote side switching unit (not shown) are connected in association with each other, and the signal lines between the remote side switching unit (not shown) and the backup SW unit 44 are connected. Assume that 103B is also associated and connected.

  When the remote side fault monitoring unit 53 in the first remote device 22A receives the life check IP packet from the fault monitoring unit 37 in the site A side PBX 14 via the IP network 5, the remote side fault monitoring unit 53 sends the response IP packet to the IP network. 5 is notified to the failure monitoring unit 37. Therefore, when the remote side fault monitoring unit 53 receives the life check IP packet at a predetermined cycle from the fault monitoring unit 37 of the site A side PBX 14, the line condition between the first remote device 22A and the site A side PBX 14 is normal. When a life check IP packet for each predetermined period cannot be received from the failure monitoring unit 37 of the site A side PBX 14, a line failure has occurred between the first remote device 22 A and the site A side PBX 14. It is to be judged.

  Further, the remote fault monitoring unit 53 in the first remote device 22A normally has the signal line 102A and the site B of the remote IF control unit 52 when the line state between the first remote device 22A and the site A side PBX 14 is normal. The remote side switching unit 54 is switch-controlled to connect the signal line 101A to the side first extension IF control unit 43A.

  Further, when it is determined that the line state between the first remote device 22A and the site A side PBX 14 is faulty, the remote fault monitoring unit 53 in the first remote device 22A has a signal line 102A of the remote side IF control unit 52. Is disconnected from the signal line 101A of the site B side first extension IF control unit 43A, and the signal line 103A of the backup SW unit 44 is connected to the signal line 101A of the site B side first extension IF control unit 43A. Accordingly, the remote side switching unit 54 is controlled to be switched and an IP packet of a switching request signal is output to the second remote device 22B in the same group via the site B side HUB 21.

  Although not shown, the second remote device 22B includes a remote-side IP network IF unit that controls a communication interface with the site-B side HUB 21, and a remote-side failure monitoring unit that monitors a line failure with the site-A side PBX 14. A remote side IF control unit and a remote side switching unit, and when the line status with the site A side PBX 14 is normal in the remote side fault monitoring unit, the signal line of the remote side IF control unit and the site B side In order to connect the signal line 101B to the 2-extension IF control unit 43B, the remote side switching unit is controlled to be switched, and the remote side failure monitoring unit determines that the line state with the site A side PBX 14 is faulty. If the line state between the first remote device 22A and the site A side PBX 14 is determined to be faulty, the signal line of the remote side IF control unit and the site B side second extension IF control Switching control of the remote side switching unit is performed so as to disconnect the signal line 101B of 43B and connect the signal line 103B of the backup SW unit 44 and the signal line 101B of the second extension IF control unit 43B on the site B side. In addition, an IP packet of a switching request signal is output to the first remote device 22A in the same group via the site B side HUB 21.

  In addition, the remote fault monitoring unit 53 in the first remote device 22A is configured so that the fault monitoring unit of the site A side PBX 14 via the IP network 5 even if the line state between the first remote device 22A and the site A side PBX 14 is normal. 37 or when receiving an IP packet of a switching request signal from a remote side failure monitoring unit (not shown) in the second remote device 22B of the same group, the signal line 102A of the remote side IF control unit 52 and the first on the site B side Remote side switching to disconnect the signal line 101A of the extension IF control unit 43A and connect the signal line 103A of the backup SW unit 44 and the signal line 101A of the site B side first extension IF control unit 43A. The unit 54 is controlled to be switched.

  Further, the communication network described in claim 1 is the IP network 5, the private branch exchange is the site A side PBX 14, the extension terminals are the site B side first telephone 23A, the site B side second telephone 23B, the site B side first radio base station 24A, and The site B-side second radio base station 24B, the remote devices are the first remote device 22A and the second remote device 22B, the backup private branch exchange is the backup PBX 25, the switching control means is the remote side switching unit 54, and the request signal output means is remote. The side failure monitoring unit 53 and the private branch exchange side request signal output means correspond to the failure monitoring unit 37.

  Next, the operation of the extension telephone system 1 showing this embodiment will be described. FIG. 4 is an operation sequence showing a processing operation related to a line failure detection process when the line is normal between the site A side switching system 2 and the site B side switching system 3.

  The line failure detection processing shown in FIG. 4 is the failure monitoring unit 37 in the site A side PBX 14 and the remote side failure of the first remote device 22A (second remote device 22B) in the site B side switching system 3 when the line is normal. This is a process for periodically monitoring the line status between the monitoring units 53.

  The failure monitoring unit 37 in the site A side PBX 14 periodically starts a life check IP packet notification operation to the first remote device 22A in the site B side switching system 3 (step S11). The IP packet is notified to the first remote device 22A in the site B side switching system 3 via the site A side HUB 13 (step S12), the IP network 5 and the site B side HUB 21 (step S13) (step S14).

  When receiving the life check IP packet from the failure monitoring unit 37 in the site A side PBX 14, the remote side failure monitoring unit 53 in the first remote device 22A recognizes that the line state with the site A side PBX 14 is normal. Then, a notification IP packet notification operation to the site A side PBX 14 is started (step S15), and the site A side PBX 14 is transmitted via the site B side HUB 21 (step S16) and the IP network 5 and the site A side HUB 13 (step S17). (Step S18). When the failure monitoring unit 37 receives the response IP packet from the first remote device 22A, the failure monitoring unit 37 recognizes that the line state with the first remote device 22A in the site B side switching system 3 is normal.

  At this time, since the line state between the site A side PBX 14 and the first remote device 22A is normal, the remote side switching unit 54 in the first remote device 22A switches to the signal line 103A of the backup SW unit 44. Without connecting the signal line 102A of the remote IF control unit 52 and the signal line 101A of the site B side first extension IF control unit 43A, the site A side PBX 14 and the site B side first extension IF control unit 43A are connected. That is, the communication path is formed. Accordingly, the site B side first telephone 23A and the site B side first radio base station 24A that are accommodated and connected to the site B side first extension IF control unit 43A are connected to the communication network under the control of the main controller 39 in the site A side PBX 14. Will belong.

  In addition, the failure monitoring unit 37 periodically starts a life check IP packet notification operation to the second remote device 22B in the site B side switching system 3 (step S19). Notification is made to the second remote device 22B in the site B side switching system 3 via the site A side HUB 13 (step S20), the IP network 5 and the site B side HUB 21 (step S21) (step S22).

  When the remote fault monitoring unit 53 in the second remote device 22B receives the life check IP packet from the fault monitoring unit 37 in the site A side PBX 14, it recognizes that the line state with the site A side PBX 14 is normal. Then, a response IP packet notification operation to the site A side PBX 14 is started (step S23), and the site A side PBX 14 is transmitted via the site B side HUB 21 (step S24) and the IP network 5 and the site A side HUB 13 (step S25). (Step S26). When the failure monitoring unit 37 of the site A side PBX 14 receives the response IP packet from the second remote device 22B, it recognizes that the line state with the second remote device 22B in the site B side switching system 3 is normal. To do.

  At this time, since the line state between the site A side PBX 14 and the second remote device 22B is normal, the remote side switching unit (not shown) in the second remote device 22B is connected to the signal line 103B of the backup SW unit 44. The signal line of the remote IF control unit (not shown) and the signal line 101B of the site B side second extension IF control unit 43B are connected without switching to the site A side PBX 14 and the site B side A communication path between the two extension IF control units 43B is formed. Accordingly, the site B side second telephone 23B and the site B side second radio base station 24B that are accommodated and connected to the site B side second extension IF control unit 43B are connected to the communication network under the control of the main controller 39 in the site A side PBX 14. Will belong.

  According to the line failure monitoring process shown in FIG. 4, the remote side failure monitoring unit 53 in the first remote device 22A (second remote device 22B) performs life within a predetermined period from the failure monitoring unit 37 in the site A side PBX 14. When the check IP packet is received, the line condition between the first remote device 22A (second remote device 22B) and the site A side PBX 14 is normal, and the first remote device 22A (second remote device 22B). ) Side.

  Further, according to the line failure monitoring process shown in FIG. 4, the failure monitoring unit 37 of the site A side PBX 14 receives a response IP packet for the life check IP packet from the first remote device 22A (second remote device 22B). Then, the site A side PBX 14 can recognize that the line state between the site A side PBX 14 and the first remote device 22A (second remote device 22B) is normal.

  FIG. 5 is an operation sequence showing a processing operation related to a line failure detection process at the time of a line failure between the site A side switching system 2 and the site B side switching system 3.

  The line failure detection process shown in FIG. 5 is performed when, for example, a line failure occurs between the site A side PBX 14 and the first remote device 22A, and the line failure is detected, and the first remote device 22A and the first remote device in the same group are detected. 2 is a process of switching the extension managed on the remote device 22B side to the communication network under the control of the backup main controller 54.

  In FIG. 5, it is assumed that a line failure has occurred between the site A side PBX 14 and the first remote device 22A.

  The failure monitoring unit 37 in the site A side PBX 14 periodically starts a life check IP packet notification operation to the first remote device 22A (step S31), and sends the life check IP packet to the site A side HUB 13 The first remote device 22A is notified via (step S32).

  However, as a matter of course, since a line failure has occurred between the site A side PBX 14 and the first remote device 22A, the life check IP packet cannot be received on the first remote device 22A side. Therefore, the failure monitoring unit 37 in the site A side PBX 14 cannot receive the response IP packet for the life check IP packet from the remote side failure monitoring unit 53 of the first remote device 22A within a predetermined period.

  Further, when the failure monitoring unit 37 cannot receive the response IP packet from the first remote device 22A within a predetermined period, the failure monitoring unit 37 starts the first retry operation (step S33), and again sends the life check IP packet to the site. Although notification is made via the A-side HUB 13 (step S34), since a line failure has occurred, the first remote device 22A cannot receive the life check IP packet.

  Further, when the failure monitoring unit 37 cannot receive the response IP packet from the first remote device 22A within a predetermined period, the failure monitoring unit 37 starts the second retry operation (step S35), and again transmits the life check IP packet to the site. Although notification is made via the A-side HUB 13 (step S36), a life failure IP packet cannot be received on the first remote device 22A side because a line failure has occurred. Therefore, the failure monitoring unit 37 in the site A side PBX 14A cannot receive the response IP packet for the life check IP packet from the remote side failure monitoring unit 53 of the first remote device 22A within a predetermined period.

  Therefore, if the failure monitoring unit 37 does not receive a response IP packet for the life check IP packet in the second retry operation within a predetermined period, the failure monitoring unit 37 does not execute the third retry operation and does not execute the third retry operation. Then, it is determined that the line condition between the first remote device 22A is a failure and the line failure is detected (step S37).

  When the failure monitoring unit 37 detects a line failure between the site A side HUB 13 and the first remote device 22A, the failure monitoring unit 37 performs an IP packet notification operation for a switch request signal to the second remote device 22B in the same group as the first remote device 22A. The switching request signal IP packet is notified to the second remote device 22B via the site A side HUB 13 (step S39), the IP network 5 and the site B side HUB 21 (step S40) (step S38). S41).

  When the remote side failure monitoring unit (not shown) of the second remote device 22B receives the IP packet for the switching request signal (step S42), the backup SW unit 44 is sent to the remote side switching unit (not shown). Is switched to the side (step S43). At this time, the remote side switching unit in the second remote device 22B disconnects the connection between the signal line of the remote IF control unit and the signal line 101B of the site B side second extension IF control unit 43B. The signal line 101B of the B side second extension IF control unit 43B and the signal line 103B of the backup SW unit 44 are connected (step S44), and between the backup SW unit 44 and the site B side second extension IF control unit 43B. Will be formed. Therefore, the site B side second telephone 23B and the site B side second radio base station 24B that are accommodated and connected to the site B side second extension IF control unit 43B communicate with each other under the control of the backup main controller 45 in the backup PBX 25. Belongs to the network.

  Further, if the remote side failure monitoring unit 53 of the first remote device 22A cannot receive the life check IP packet from the site A side PBX 14 within a predetermined period, the line between the first remote device 22A and the site A side PBX 14 It is determined that the state is a failure, and a line failure is detected autonomously (step S45). In addition, within the predetermined period here, the life check IP packet by the second retry operation is normally received from the life check IP packet notification operation received from the failure monitoring unit 37 inside the site A side PBX 14. This is equivalent to the time required to complete.

  When the remote side failure monitoring unit 53 of the first remote device 22A detects a line failure between the site A side PBX 14 and the first remote device 22A in step S45, the backup side SW unit 44 side with respect to the remote side switching unit 54 is detected. Is switched to (step S46). At this time, the remote side switching unit 54 in the first remote device 22A disconnects the connection between the signal line 102A of the remote side IF control unit 52 and the signal line 101A of the site B side first extension IF control unit 43A. Then, the signal line 101A of the site B side first extension IF control unit 43A and the signal line 103A of the backup SW unit 44 are connected (step S47), and the backup SW unit 44 and the site B side first extension IF control are performed. A communication path between the parts 43A is formed. Therefore, the site B side first telephone 23A and the site B side first radio base station 24A that are accommodated and connected to the site B side first extension IF control unit 43A communicate under the control of the backup main controller 45 in the backup PBX 25. Belongs to the network.

  Then, the remote-side failure monitoring unit 53 of the first remote device 22A starts the notification operation of the IP packet for the switch request signal to the second remote device 22B in the same group (step S48), and the site B-side HUB 21 The second remote device 22B is notified via the route (step S49) (step S50).

  When the remote-side failure monitoring unit (not shown) of the second remote device 22B receives the switching request signal IP packet from the first remote device 22A, the remote switching unit (not shown) uses the backup SW unit 44. If it is determined that the switch has been switched to the backup SW unit 44, the switch request signal IP packet is discarded (step S51), and this processing operation is terminated. .

  When the remote side failure monitoring unit (not shown) of the second remote device 22B receives the switch request signal IP packet from the first remote device 22A, the remote switching unit (not shown) performs backup SW. If it is determined that the switch has not been switched to the unit 44, that is, it is being connected to the remote IF control unit (not shown), the remote switch unit is controlled to switch to the backup SW unit 44. At this time, the remote side switching unit in the second remote device 22B disconnects the connection between the signal line of the remote IF control unit and the signal line 101B of the site B side second extension IF control unit 43B. The signal line 101B of the B side second extension IF control unit 43B and the signal line 103B of the backup SW unit 44 are connected to establish a speech path between the backup SW unit 44 and the site B side second extension IF control unit 43B. Will form. Therefore, the site B side second telephone 23B and the site B side second radio base station 24B that are accommodated and connected to the site B side second extension IF control unit 43B communicate with each other under the control of the backup main controller 45 in the backup PBX 25. Belongs to the network.

  According to the line failure detection process shown in FIG. 5, for example, when a line failure occurs between the site A side PBX 14 and the first remote device 22A in the site B side switching system 3, the remote side failure in the first remote device 22A occurs. The monitoring unit 53 detects a line failure with the site A side PBX 14, disconnects the communication path connection with the remote side IF control unit 52 to the site B side first extension IF control unit 43A, and backs up the SW unit 44. When a line failure with the first remote device 22A is detected on the failure monitoring unit 37 side in the site A side PBX 14, the second remote device 22B in the same group as the first remote device 22A is detected. When a switch request signal IP packet is received and output on the second remote device 22B side, a second request is sent to the site B side second packet. Since the communication path connection with the remote IF control section is disconnected from the line IF control section 43B and switched to the communication path with the backup SW section 44, for example, the first remote device 22A and the site A side Even if a line failure occurs between the PBXs 14, the first remote device 22A and the second remote device 22B of the same group are placed under the same communication network under the speech path control of the backup main controller 45, so that Call connection between extensions is possible.

  Further, according to the line failure detection device shown in FIG. 5, for example, when a line failure occurs between the site A side PBX 14 and the first remote device 22A, a line failure is detected on the failure monitoring unit 37 side in the site A side PBX 14. Then, the switch request signal IP packet is notified to the second remote device 22B in the same group as the first remote device 22A, and a line failure is detected on the remote failure monitoring unit 53 side of the first remote device 22A. Since the switch request signal IP packet is notified to the second remote device 22B in the same group, both the failure monitoring unit 37 in the site A side PBX 14 and the remote side failure monitoring unit 53 in the first remote device 22A Thus, the switch request signal IP packet can be reliably notified to the second remote device 22B in the same group.

  FIG. 6 is an operation sequence showing a processing operation related to a line failure recovery process between the site A side switching system 2 and the site B side switching system 3.

  The line failure recovery processing shown in FIG. 6 is a communication network before the line failure when the line failure between the site A side PBX 14 and the first remote device 22A is recovered, for example. It is processing for returning to.

  When the IP network IF unit 34 of the site A side PBX 14 reaches the recovery start time after recovery from the line failure stored in the clock information holding unit 38 (step S61), the IP network IF unit 34 transmits the information to the first remote device 22A and the second remote device 22B. The notification operation of the IP packet for the switchback request signal is started (step S62), and the IP packet for the switchback request signal is sent via the site A side HUB 13 (step S63), the IP network 5 and the site B side HUB 21 (step S64). ) To notify the first remote device 22A and the second remote device 22B respectively (step S65, step S66).

  When the remote side failure monitoring unit 53 in the first remote device 22A receives the IP packet for the switchback request signal (step S67), the remote side switching unit 54 switches and controls the remote side switching unit 54 so as to switch to the site A side PBX 14. (Step S68). At this time, the remote side switching unit 54 in the first remote device 22A disconnects the signal line 103A of the backup SW unit 44 and the signal line 101A of the site B side first extension IF control unit 43A. , The signal line 101A of the site B side first extension IF control unit 43A and the signal line 102A of the remote side IF control unit 52 are connected, and a call is made between the site A side PBX 14 and the site B side first extension IF control unit 43A. A path is formed (step S69). Therefore, the site B side first telephone 23A and the site B side first radio base station 24A that are accommodated and connected to the site B side first extension IF control unit 43A are connected to the communication network under the control of the main controller 39 in the site A side PBX 14. Will belong to.

  Further, when the remote side failure monitoring unit (not shown) in the second remote device 22B receives the IP packet for the switchback request signal from the site A side PBX 14 (step S70), the remote side fault monitoring unit 22B is switched to the site A side PBX 14 Therefore, the remote side switching unit (not shown) is controlled to be switched (step S71). At this time, the remote side switching unit (not shown) in the second remote device 22B connects the signal line 103B of the backup SW unit 44 to the signal line 101B of the site B side second extension IF control unit 43B. And the signal line 101B of the site B side second extension IF control unit 43B and the signal line of the remote side IF control unit (not shown) are connected, and the site A side PBX 14 and the site B side second extension are connected. A speech path between the IF control units 43B is formed (step S72). Accordingly, the site B side second telephone 23B and the site B side second radio base station 24B that are accommodated and connected to the site B side second extension IF control unit 43B are connected to the communication network under the control of the main controller 39 in the site A side PBX 14. Will belong to.

  According to the line failure recovery processing shown in FIG. 6, for example, when the line failure between the site A side PBX 14 and the first remote device 22A is recovered, even if the line is immediately switched to the state before the failure after the recovery, fluctuations, etc. Since the line state becomes unstable at this point, it takes time for the line state to stabilize after the recovery. Therefore, a recovery start time corresponding to the time when a predetermined time has elapsed after the recovery is set, and the site A side PBX 14 side When the recovery start time is reached by the IP network IF unit 34, the first remote device 22A and the second remote device 22B are notified of an IP packet for a switchback request signal, and the first remote device 22A and The second remote device 22B can be returned to the communication network before the line failure.

  According to the present embodiment, for example, when a line failure between the first remote device 22A and the site A side PBX 14 is detected on the second remote device 22B side of the same group, the site A side PBX 14 is naturally on the first remote device 22A side. Is disconnected and connected to the communication path of the backup SW unit 44, but the backup SW unit 44 is also disconnected in the second remote device 22B by disconnecting the communication path connection with the site A side PBX 14. Are connected to both the first remote device 22A and the second remote device 22B in the same group, and the extension of the same group under the same communication network under the communication path control of the backup main controller 45. For example, a line failure occurs between the first remote device 22A and the site A side PBX 14 because the call connection between them is possible. Even, by configuring the entire remote device backup main control unit 45 under control of the communication network in the same group, it is possible to call connection extension each other in the same group.

  According to the present embodiment, for example, when a line failure with the site A side PBX 14 is detected on the first remote device 22A side, a switch request signal signal is sent to the second remote device 22B in the same group as the first remote device 22A. When the IP packet is output and the second remote device 22B detects the switch request signal IP packet, the communication path connection with the site A side PBX 14 is disconnected and the communication path of the backup SW unit 44 is connected. Based on the communication path control of the backup main controller 45, the extension lines in the same group can be connected to each other, so even if a line failure occurs between the first remote device 22A and the site A side PBX 14, for example, Based on the IP packet for switching request signal from the first remote device 22A to the second remote device 22B that detects It can be composed of all the remote device backup main control unit 45 under control of the communication network in the flop.

  According to the present embodiment, for example, when a line failure with the first remote device 22A is detected on the site A side PBX 14 side, the switch request signal IP packet is output to the second remote device and the second remote device When the device 22B detects the switching request signal IP packet from the site A side PBX 14, the communication path connection with the site A side PBX 14 is disconnected and connected to the communication path of the backup SW unit 44, and the backup main control device 45 is connected. Based on the communication path control, the extension lines can be connected to each other. For example, even if a line failure occurs between the first remote device 22A and the site A side PBX 14, the site A side PBX 14 that detected the line failure All remote devices in the same group are backed up based on the IP packet for switching request signal from the remote device 22B to the second remote device 22B. Tsu can be composed flop for main controller 45 under control of the communication network.

  According to the present embodiment, when the IP packet for the switchback request signal from the site A side PBX 14 is detected on the first remote device 22A and the second remote device 22B side, the communication path connection with the backup SW unit 44 is established. Disconnect and connect to the communication path of the site A side PBX 14, that is, to the remote IF control unit 52, and based on the communication path control of the main controller 39 of the site A side PBX 14, the extension lines in the same group can be connected to each other. Since the first remote device 22A and the second remote device 22B in the same group detect the switchback request signal IP packet from the site A side PBX 14, the first remote device 22A and the second remote device 22B return to the communication network before the line failure. In the same communication network under the control of the main control device 39 of the site A side PBX 14, the call connection between the extensions in the same group is established. It becomes ability.

  According to the present embodiment, for example, attention is paid to the fact that fluctuations occur immediately after failure recovery and the line state becomes unstable, and recovery start corresponding to the point when a predetermined time has elapsed after failure recovery at the site A side PBX 14 When the time is reached, the switch-back request signal IP packet is output to the first remote device 22A and the second remote device 22B in the same group, so that all the remote devices in the same group are in a stable state before the line failure. Can be returned to the communication network.

  In the above embodiment, the first remote device 22A and the second remote device 22B are described as examples of a plurality of remote devices that accommodate and connect the same group of extensions. However, there are three or more remote devices. However, it goes without saying that the same effect can be obtained.

  According to the extension telephone system of the present invention, when a line fault with a private branch exchange is detected in one of the remote devices in the same group, all remote devices in the same group are connected to the communication path of the backup private branch exchange. Since the extension terminals in the same group can be connected to each other over the same communication network using the same private branch exchange, at least one of the plurality of remote devices accommodating and connecting the extension terminals in the same group. Even if a line failure occurs with a private branch exchange, all remote devices in the same group can be configured on the same communication network using a private branch exchange for backup, so calls between extension terminals in the same group In-house LAN that connects the head office and remote offices via a dedicated line, for example. It is useful to the extension telephone system.

It is a block diagram which shows schematic structure inside the extension telephone system which shows embodiment of this invention. It is a block diagram which shows schematic structure inside the site A side PBX in connection with this Embodiment. It is a block diagram which shows schematic structure inside the 1st remote apparatus and backup PBX which are the principal parts inside the site B side exchange system in connection with this Embodiment. It is an operation | movement sequence which shows the processing operation regarding the line failure detection process at the time of the line normal between the site A side switching system and the site B side switching system in connection with this Embodiment. It is an operation | movement sequence which shows the processing operation regarding the line failure detection process at the time of the line failure between the site A side switching system and the site B side switching system concerning this Embodiment. It is an operation | movement sequence which shows the processing operation regarding the line failure recovery process between the site A side switching system and the site B side switching system concerning this Embodiment.

Explanation of symbols

1 Extension telephone system 5 IP network (communication network)
14 Site A side PBX (private branch exchange)
22A First remote device (remote device)
22B Second remote device (remote device)
23A Site B side first telephone (extension terminal)
23B Site B side second telephone (extension terminal)
24A Site B side first radio base station (extension terminal)
24B Site B side second radio base station (extension terminal)
37 Fault monitor (private branch exchange side request signal output means)
25 PBX for backup (private branch exchange for backup)
53 Remote side fault monitoring unit (request signal output means)
54 Remote-side switching unit (switching control means)

Claims (4)

A first private branch exchange that performs call control between a plurality of extension telephones via a communication network, and is connected to the first private branch exchange and the plurality of extension telephones via the communication network ; Te plurality of the remote device, the extension telephone system odor and a second private branch exchange which is connected via a plurality of remote devices each signal line for relaying a signal of the extension telephone with the communication network,
The remote device is
A communication network interface unit that is an interface with the communication network;
A switching unit for connecting the extension telephone to either the first private branch exchange or the second private branch exchange via the communication network interface unit;
A remote side failure monitoring unit that transmits and receives packets to and from the first private branch exchange via the communication network and monitors the presence or absence of a failure,
The second private branch exchange is
A switch that is connected to the switching unit of the plurality of remote devices and sets a communication path between the plurality of remote devices;
The first remote device is:
When the remote side failure monitoring unit detects a failure, the connection of the switching unit is changed from the communication network interface unit to the switch of the second private branch exchange, and the first remote device belongs to the same group as the first remote device. 2 to send a switching request to the remote device via the communication network via the communication network interface unit,
The second remote device is
When the switching request is received from the communication network , the extension telephone system changes the connection of the switching unit from the communication network interface unit to the switch of the second private branch exchange . The extension telephone system according to claim 1, wherein
The first private branch exchange has a failure monitoring unit that transmits and receives packets to and from the remote device via the communication network and monitors the presence or absence of a failure.
The first private branch exchange is
When the failure monitoring unit detects a failure in communication with the first remote device, a switching request is transmitted to the second remote device belonging to the same group as the first remote device via the communication network. inner wire telephone system, characterized by. The extension telephone system according to claim 2,
When the second remote device receives the switching request from the first remote device, the second remote device determines whether or not the connection of the switching unit has already been changed to the switch, and if not changed If it is determined, an inner line telephone system and changes to the second of said switches of a private branch exchange to connect said switching unit from said communications network interface unit. The extension telephone system according to claim 2,
The first private branch exchange sends a switchback request to the first remote device and the second remote device after a predetermined time has elapsed after recovery from the failure,
The first remote device and the second remote device that have received the switchback request change the connection of the switching unit from the second private branch exchange to the communication network interface unit, respectively. the inner line telephone system.

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