JPWO2019021460A1 - Remote monitoring system - Google Patents

Abstract

A remote monitoring system that remotely monitors a plurality of devices to be monitored via a network sends request information for requesting notification of first identification information for identifying the devices to be monitored in the network to a second communication protocol different from that of the network. A request information transmission unit that transmits to the monitoring target device via the second network by a call using the second identification information for identifying the monitoring target device in the network, and the first identification information and the second identification information. An identification information collation that collates the response information receiving unit that receives response information returned from the monitored device, the second identification information included in the response information, and the second identification information transmitted by the request information transmission unit And the first identification information included in the response information as the first identification information of the monitoring target device based on the collation result, and the monitoring target device via the network And a communication unit for signal.

Description

  The present invention relates to a remote monitoring system.

  2. Description of the Related Art Conventionally, there has been known a system capable of easily accessing a monitoring device and a monitoring target device in a LAN from a terminal connected to a WAN when remotely acquiring information on the monitoring target device via the Internet or the like. (For example, refer to Patent Document 1). In the system described in Patent Document 1, an access URL list for accessing a monitoring target device is generated and stored in a Web server, and a terminal connected to the WAN is connected to the monitoring device and the monitoring device via the Web server. The target device can be accessed.

JP 2010-9129 A

  By the way, in the system described in Patent Document 1, when there are a plurality of monitoring target devices, a technique for facilitating the comparison of the connection target monitoring target devices is not considered. Therefore, in the system described in Patent Document 1, when there are a plurality of monitoring target devices, there is a possibility that the monitoring target devices of the connection destination cannot be easily verified.

  The present invention has been made in consideration of such circumstances, and in an emergency connection remote monitoring system having a plurality of monitoring target devices, remote monitoring that can facilitate verification of connection target monitoring target devices. The purpose is to provide a system.

  A remote monitoring system for remotely monitoring a plurality of devices to be monitored via a network uses request information for requesting notification of first identification information for identifying the devices to be monitored in the network, with a communication protocol different from that of the network. A request information transmission unit for transmitting to the monitored device by communication via the second network by a call using the second identification information for identifying the monitored device in the second network; and the monitored object Information including the first identification information and the second identification information of the device, and receiving response information returned from the monitored device in response to the request information transmitting unit transmitting the request information A response information receiving unit, the second identification information included in the response information received by the response information receiving unit, and the request information transmitting unit. An identification information collating unit that collates the received second identification information, and the first identification information included in the response information based on a collation result of the identification information collating unit. And a communication unit that communicates with the monitoring target device via the network.

  In the above remote monitoring system, the first identification information may be an Internet protocol address, and the second identification information may be a telephone number.

  Any of the above remote monitoring systems may include a monitoring terminal and a relay server, the request information transmission unit may be provided in the monitoring terminal, and the identification information collation unit may be provided in the relay server.

  In the remote monitoring system including a monitoring terminal and a relay server, the relay server includes a plurality of the monitoring terminals that communicate with the monitoring target device based on information indicating an operation status of the monitoring terminal. You may further provide the monitoring terminal selection part selected from among these.

  ADVANTAGE OF THE INVENTION According to this invention, the remote monitoring system which can make easy collation of the monitoring target apparatus of a connection destination can be provided in the remote monitoring system of the emergency connection which has several monitoring target apparatus.

It is a figure which shows an example of the remote monitoring system of 1st Embodiment. It is a figure which shows an example of the remote monitoring system of 2nd Embodiment. It is a figure which shows the example of application of the remote monitoring system of 1st Embodiment. It is the figure which showed the basic part of the mechanism of communication in the application example shown in FIG. It is a figure which shows the communication flow at the time of the abnormality report between the monitoring terminal and the monitoring object apparatus. It is a figure which shows the communication flow in case the monitoring terminal MT collects information.

  Hereinafter, an embodiment of a remote monitoring system of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram illustrating an example of a remote monitoring system 1 according to the first embodiment.
The remote monitoring system 1 includes a plurality of monitoring terminals MT1, MT2,... And a relay server RS. The monitoring terminal MT1 includes a request information transmission unit MT1A and a communication unit MT1B. The relay server RS includes a request information relay unit RSA, a response information reception unit RSB, an identification information matching unit RSC, a relay unit RSD, and a monitoring terminal selection unit RSE.
The request information transmission unit MT1A of the monitoring terminal MT1 is configured to be connectable to the request information relay unit RSA of the relay server RS via, for example, a VPN (Virtual Private Network). The communication unit MT1B of the monitoring terminal MT1 is configured to be connectable to the identification information matching unit RSC of the relay server RS and the relay unit RSD via, for example, VPN.
The response information receiving unit RSB of the relay server RS is configured to be connectable to the first communication unit ME1A of the monitoring target device ME1 via the first network NW1 (for example, VPN). The relay unit RSD of the relay server RS is configured to be connectable to the first communication unit ME1A of the monitoring target device ME1 via the first network NW1. Further, the relay unit RSD of the relay server RS is configured to be connectable to the monitoring terminal MT2 via, for example, VPN.
The request information relay unit RSA of the relay server RS is configured to be connectable to the second communication unit ME1B of the monitoring target device ME1 via a second network NW2 (for example, a mobile phone communication network) having a communication protocol different from that of the first network NW1. Has been.

The response information receiving unit RSB of the relay server RS can also be connected to the monitoring target device ME2 via the first network NW1. Further, the relay unit RSD of the relay server RS can be connected to the monitoring target device ME2 via the first network NW1.
The request information relay unit RSA of the relay server RS can also be connected to the monitoring target device ME2 via the second network NW2.

The remote monitoring system 1 remotely monitors a plurality of monitoring target devices ME1, ME2,... Via the first network NW1 and the second network NW2.
For example, when the monitoring terminal MT1 monitors the monitoring target device ME1, the request information transmission unit MT1A of the monitoring terminal MT1 includes first identification information (for example, IP (Internet Protocol)) that identifies the monitoring target device ME1 in the first network NW1. Address) request information is transmitted to the second communication unit ME1B of the monitoring target device ME1 by communication via the request information relay unit RSA of the relay server RS and the second network NW2. The request information relay unit RSA of the relay server RS sends the request information to the monitoring target device ME1 by the call using the second identification information (for example, telephone number) for identifying the monitoring target device ME1 in the second network NW2. 2 Transmit to the communication unit ME1B.
The request information relay unit RSA of the relay server RS also transmits the second identification information included in the request information to the identification information matching unit RSC.

Further, when the monitoring terminal MT1 monitors the monitoring target device ME1, the response information receiving unit RSB of the relay server RS displays response information that is information including the first identification information and the second identification information of the monitoring target device ME1. And received from the first communication unit ME1A of the monitoring target device ME1 via the first network NW1. This response information is returned from the first communication unit ME1A of the monitoring target device ME1 in response to the request information transmission unit MT1A of the monitoring terminal MT1 transmitting the request information.
The response information receiving unit RSB of the relay server RS transmits the second identification information (telephone number) included in the received response information to the identification information matching unit RSC.

Further, when the monitoring terminal MT1 monitors the monitoring target device ME1, the identification information matching unit RSC of the relay server RS receives the second identification information included in the response information received by the response information receiving unit RSB and the request of the monitoring terminal MT1. The information transmitting unit MT1A collates with the second identification information used when the request information is transmitted via the request information relay unit RSA.
When the collation result is OK, the identification information collation unit RSC can start communication between the collation result (that is, the monitoring terminal MT1 and the monitoring target device ME1 via the relay server RS and the first network NW1). To the communication unit MT1B of the monitoring terminal MT1.

  When the monitoring terminal MT1 monitors the monitoring target device ME1, the communication unit MT1B of the monitoring terminal MT1 uses the first identification information included in the response information (based on the collation result of the identification information collation unit RSC of the relay server RS. For example, the IP address) is used as the first identification information of the monitoring target device ME1, thereby communicating with the first communication unit ME1A of the monitoring target device ME1 via the relay unit RSD of the relay server RS and the first network NW1. This communication is communication for the monitoring terminal MT1 to monitor the monitoring target device ME1.

  The monitoring terminal MT1 can also monitor the monitoring target device ME2 by using a method similar to the method for monitoring the monitoring target device ME1. The monitoring terminal MT2 may be configured similarly to the monitoring terminal MT1, or may be configured differently from the monitoring terminal MT1.

The monitoring terminal selection unit RSE of the relay server RS selects a monitoring terminal that communicates with the monitoring target device ME1 based on information (for example, failure information) indicating the operating status of the monitoring terminals MT1, MT2,. Select from MT2,...
For example, when the monitoring terminal MT1 fails, the monitoring terminal selection unit RSE selects the monitoring terminal MT2 instead of the monitoring terminal MT1, for example. As a result, instead of the monitoring terminal MT1, the monitoring terminal MT2 monitors the monitoring target device ME1.

  In the remote monitoring system 1 of the first embodiment, the identification information matching unit RSC is provided, and there are a plurality of monitored devices ME1, ME2,... However, it is possible to easily associate the IP address with the monitoring target device ME1.

Second Embodiment
FIG. 2 is a diagram illustrating an example of the remote monitoring system 1 according to the second embodiment.
The remote monitoring system 1 of the first embodiment includes the relay server RS, but the remote monitoring system 1 of the second embodiment does not include the relay server.
Specifically, the remote monitoring system 1 according to the second embodiment includes a monitoring terminal MT01. The monitoring terminal MT01 includes a request information transmission unit MT01A, a response information reception unit MT01B, an identification information collation unit MT01C, and a communication unit MT01D.
The request information transmission unit MT01A of the monitoring terminal MT01 is configured to be connectable to the second communication unit ME1B of the monitoring target device ME1 via the second network NW2. The request information transmission unit MT01A can also be connected to the monitoring target device ME2 via the second network NW2.
The response information receiving unit MT01B of the monitoring terminal MT01 is configured to be connectable to the first communication unit ME1A of the monitoring target device ME1 via the first network NW1. The response information receiving unit MT01B can also be connected to the monitoring target device ME2 via the first network NW1.

That is, similarly to the remote monitoring system 1 of the first embodiment, the remote monitoring system 1 of the second embodiment remotely connects a plurality of monitoring target devices ME1, ME2,... Via the first network NW1 and the second network NW2. Monitor.
For example, when the monitoring terminal MT01 monitors the monitoring target device ME1, the request information transmission unit MT01A of the monitoring terminal MT01 requests information for requesting notification of first identification information for identifying the monitoring target device ME1 in the first network NW1. Is transmitted to the second communication unit ME1B of the monitoring target device ME1 by communication via the second network NW2. The request information transmission unit MT01A transmits the request information to the second communication unit ME1B of the monitoring target device ME1 by a call using the second identification information for identifying the monitoring target device ME1 in the second network NW2.
The request information transmission unit MT01A also transmits the second identification information included in the request information to the identification information matching unit MT01C.

When the monitoring terminal MT01 monitors the monitoring target device ME1, the response information receiving unit MT01B of the monitoring terminal MT01 receives response information that is information including the first identification information and the second identification information of the monitoring target device ME1. And received from the first communication unit ME1A of the monitoring target device ME1 via the first network NW1. This response information is returned from the first communication unit ME1A of the monitoring target device ME1 in response to the request information transmission unit MT01A of the monitoring terminal MT01 transmitting the request information.
The response information receiving unit MT01B transmits the second identification information included in the received response information to the identification information matching unit MT01C.

When the monitoring terminal MT01 monitors the monitoring target device ME1, the identification information collating unit MT01C of the monitoring terminal MT01 includes the second identification information included in the response information received by the response information receiving unit MT01B and the request information transmitting unit MT01A. Is collated with the second identification information used when the request information is transmitted.
When the collation result is OK, the identification information collation unit MT01C communicates the collation result (that is, communication between the monitoring terminal MT01 and the monitoring target device ME1 can be started via the first network NW1). To the unit MT01D.

  When the monitoring terminal MT01 monitors the monitoring target device ME1, the communication unit MT01D uses the first identification information included in the response information as the monitoring target device ME1 based on the verification result of the identification information verification unit MT01C of the monitoring terminal MT01. By using as 1st identification information, it communicates with 1st communication part ME1A of the monitoring object apparatus ME1 via the 1st network NW1. This communication is communication for the monitoring terminal MT01 to monitor the monitoring target device ME1.

  In the remote monitoring system 1 according to the second embodiment, the identification information matching unit MT01C is provided, and there are a plurality of monitored devices ME1, ME2,... However, it is possible to easily associate the IP address with the monitoring target device ME1.

<Application example>
FIG. 3 is a diagram illustrating an application example of the remote monitoring system 1 according to the first embodiment.
In the example illustrated in FIG. 3, the remote monitoring system 1 includes monitoring terminals MT11 and MT12, a relay server RS, and a firewall FW. The monitoring terminal MT11 includes a main body MT11A and a communication unit MT11B configured by, for example, a communication adapter. The monitoring terminal MT12 includes a main unit MT12A and a communication unit MT12B configured by, for example, a VPN router. The relay server RS includes a main body part RS1 and VPN router parts RS2A and RS2B.
Security communication via the first network NW1 and the firewall FW is performed between the communication unit MT11B of the monitoring terminal MT11 and the VPN router unit RS2A of the relay server RS. Similarly, security communication via the first network NW1 and the firewall FW is performed between the communication unit MT12B of the monitoring terminal MT12 and the VPN router unit RS2A of the relay server RS.
In addition, security communication is performed between the VPN router unit RS2B of the relay server RS and the VPN router unit PFR of the mobile communication platform PF via the first network NW1 and the firewall FW.
Between the mobile communication platform PF and the modem unit ME11B of the monitoring target device ME11, a mobile phone communication network (in the mobile phone communication network, communication using an IP address and communication using a telephone number is possible. ) Is performed. Similarly, communication via the mobile phone communication network is performed between the mobile communication platform PF and the modem unit ME12B of the monitoring target device ME12.
The monitoring terminal MT11 or the monitoring terminal MT12 remotely monitors the main body ME11A of the monitoring target device ME11 by communicating with the modem unit ME11B of the monitoring target device ME11, and communicates with the modem unit ME12B of the monitoring target device ME12. By performing this, the main body ME12A of the monitoring target device ME12 is remotely monitored.

  In the example illustrated in FIG. 3, when the relay server RS determines that communication with the monitoring terminal MT11 that is the abnormality report destination of the monitoring target device ME11 is not possible, the monitoring terminal MT12 that is a preset transfer destination is notified. Anomaly reports can be made. The transfer setting can be performed for each IP address of the monitoring terminals MT11 and MT12.

FIG. 4 is a diagram showing a basic part of the communication mechanism in the application example shown in FIG.
In the example illustrated in FIG. 4, the monitoring terminal MT11 communicates with the relay server RS, and the modem unit ME11B of the monitoring target device ME11 communicates with the relay server RS. That is, the data transmission destination from the monitoring terminal MT11 and the data transmission destination from the modem unit ME11B of the monitoring target device ME11 are both relay servers RS. When the relay server RS performs communication relay, communication between the monitoring terminal MT11 and the modem unit ME11B of the monitoring target device ME11 is performed.
In the main body ME11A of the monitoring target device ME11, the IP address of the main body MT11A of the monitoring terminal MT11 that is the abnormality report destination is set. Instead of the IP address of the main body MT11A of the monitoring terminal MT11, the IP address of the communication unit MT11B (communication adapter or router) of the monitoring terminal MT11 may be set.
In the communication system using the modem unit ME11B of the monitoring target device ME11, the IP address (dynamic IP address) allocated to the SIM is changed every time it is connected. On the other hand, the mobile phone number is recorded and held in the SIM. In the modem unit ME11B of the monitoring target device ME11, the fixed IP address of the relay server RS is set and held.
A fixed IP address is allocated in advance to the monitoring terminal MT11. In the monitoring terminal MT11, a fixed IP address of the relay server RS is set and held. In addition, a mobile phone number for each monitoring target device ME11, ME12,... Is set in the monitoring terminal MT11.

FIG. 5 is a diagram illustrating a communication flow at the time of abnormality notification between the monitoring terminal MT11 and the monitoring target device ME11.
In the example shown in FIG. 5, in step S1, the main body ME11A of the monitoring target device ME11 transmits a communication request <communication destination IP> to the modem unit ME11B.
In step S2, a communication connection is established between the modem unit ME11B of the monitoring target device ME11 and the relay server RS.
In step S3, the modem unit ME11B of the monitoring target device ME11 transmits a communication start request <destination IP / own IP> to the relay server RS via the mobile communication platform PF.
In step S4, a communication connection between the relay server RS and the monitoring terminal MT11 is established. That is, the relay server RS establishes a communication line with the monitoring terminal MT11 having the IP address specified by <communication destination IP> based on the communication start request from the modem unit ME11B of the monitoring target device ME11.

In step S5, the relay server RS transmits a message indicating that communication can be started to the modem unit ME11B of the monitoring target device ME11. That is, since the communication connection between the relay server RS and the monitoring terminal MT11 is established in step S4, the relay server RS transmits “communication start possible” information to the modem unit ME11B of the monitoring target device ME11.
In step S6, the modem unit ME11B of the monitoring target device ME11 transmits a connection completion message to the main unit ME11A.
In step S7, direct communication is performed between the main body ME11A of the monitoring target device ME11 and the monitoring terminal MT11.
Protocol conversion is performed in the modem unit ME11B of the monitoring target device ME11. In the relay server RS, communication relay is performed.
The monitoring target device ME11 communicates only with a monitoring terminal (for example, the monitoring terminal MT11) having a preset IP address. The relay server RS has a transfer function. For example, when the monitoring target device ME11 cannot communicate with the communication request destination monitoring terminal MT11, the relay server RS monitors a monitoring terminal (for example, the monitoring terminal MT12) having a preset transfer destination IP address. Transfer control is performed so that the target device ME11 is connected.

FIG. 6 is a diagram illustrating a communication flow when the monitoring terminal MT11 collects information (that is, when line connection is performed from the monitoring terminal MT11).
In the example shown in FIG. 6, in step S11, a communication connection is established between the monitoring terminal MT11 and the relay server RS.
In step S12, the monitoring terminal MT11 makes a connection request to the relay server RS, and transmits <phone number> of the monitoring target device ME11 to be connected.
In step S13, the relay server RS sends a connection request to the mobile communication platform PF, and transmits <phone number> of the monitoring target device ME11.
In step S14, the mobile communication platform PF transmits SMS (short message service) data to the modem unit ME11B of the monitoring target device ME11 (that is, to <phone number> of the monitoring target device ME11). That is, the relay server RS receives the line connection request from the monitoring terminal MT11 in step S12, and performs SMS transmission control in steps S13 and S14.

In step S16, the modem unit ME11B of the monitoring target device ME11 transmits to the main unit ME11A that there is an incoming call.
In step S17, the main body ME11 of the monitoring target device ME11 transmits to the modem unit ME11B that the incoming call is permitted.
In step S18, a communication connection is established between the relay server RS and the modem unit ME11B of the monitoring target device ME11. That is, the modem unit ME11B of the monitoring target device ME11 that has received the SMS data performs line automatic connection.
In step S19, the modem unit ME11B of the monitoring target device ME11 notifies the relay server RS that the SMS data has been received. Specifically, the modem unit ME11B of the monitoring target device ME11 transmits its own telephone number and its own IP address to the relay server RS.
Based on the telephone number transmitted from the modem unit ME11B of the monitoring target device ME11, the relay server RS determines which of the monitoring terminals MT11, MT12,... And which of the monitoring target devices ME11, ME12,. It is determined whether or not communication using the IP address is performed with the monitoring target device.
In step S20, the relay server RS transmits a message indicating that communication can be started to the monitoring terminal MT11.
In step S21, direct communication is performed between the main body ME11A of the monitoring target device ME11 and the monitoring terminal MT11, and the monitoring target device ME11 is remotely monitored by the monitoring terminal MT11.
Also in the example illustrated in FIG. 6, protocol conversion is performed in the modem unit ME11B of the monitoring target device ME11. In the relay server RS, communication relay is performed.

That is, in the example illustrated in FIG. 6, the relay server RS receives the telephone number of the monitoring target device ME11 from the monitoring terminal MT11 in step S12. At this time, the relay server RS stores the communication IP of the transmission source monitoring terminal MT11.
In step S13, the relay server RS requests the mobile communication platform PF to perform SMS transmission to the telephone number of the monitoring target device ME11.
When the modem unit ME11B of the monitoring target device ME11 receives the SMS data, in step S19, the modem unit ME11B performs line connection to the relay server RS and notifies its own IP address and telephone number. The relay server RS holds information notified from the modem unit ME11B.
The relay server RS determines that the line establishment with the modem unit ME11B of the monitoring target device ME11 is completed, and notifies the monitoring terminal MT11 of “line establishment complete” in step S20.

In a communication system using a general mobile modem (mobile phone communication network), since the IP address allocated to the SIM is changed every time it is connected, a monitoring terminal connected to the Internet can be connected to any mobile modem. Communication start (call) cannot be performed.
Further, since general TCP communication is “TCP / IP communication”, it is necessary to designate an “IP address” of a communication destination in order to perform communication. That is, if the IP address is not known, Internet communication cannot be performed.
An “IP address” is assigned to the mobile modem (SIM) when a line connection is made. That is, the portable modem (SIM) does not have an “IP address” when the line is not connected.
On the other hand, the portable modem (SIM) has a “unique telephone number”. A portable modem (SIM) can also receive “SMS” data.

Therefore, in the remote monitoring system 1 of the present invention, communication is started from the monitoring terminal MT11 side to the modem unit ME11B side of the monitoring target device ME11 (that is, a call is made) by the mechanism as shown in FIG. .
That is, in the remote monitoring system 1 of the present invention, the “telephone number” is used for collation in data communication using the mobile phone communication network, so that the monitoring target device ME11, ME12,. It is possible to communicate with any monitored device.
On the other hand, in a communication system using a general mobile phone communication network, a connection is made from a mobile modem side to a specific server, and a constant connection is maintained.
Compared with a communication system using a general mobile phone communication network, the remote monitoring system 1 of the present invention can communicate with any monitoring terminal among a plurality of monitoring terminals MT11, MT12,. It is possible to connect from anywhere such as the base).
Further, in the remote monitoring system 1 of the present invention, it is sufficient to connect the line only when performing communication, and the communication cost can be reduced.

The communication between the monitoring terminal MT11 and, for example, the monitoring target device ME11 in the remote monitoring system 1 of the present invention is for the purpose of, for example, a regular report (for example, monthly) and a notification when a monitoring target device abnormality occurs. Therefore, there is not enough communication volume and communication frequency to be always connected.
Further, the remote monitoring system 1 of the present invention has an advantage that “recovery at the time of communication disconnection”, which is a problem in the communication method of always connection, is unnecessary in the first place.
By adopting the communication method for emergency connection, the remote monitoring system 1 of the present invention can construct and operate an inexpensive system.

If an always-connected communication method is employed, the line is disconnected if data transmission is not performed regularly within a predetermined time. As a result, the above-described “recovery at the time of communication disconnection” becomes necessary.
On the other hand, in the remote monitoring system 1 of the present invention, it is sufficient to perform communication only when necessary by adopting an emergency connection communication method. Therefore, the amount of packets can be saved.

If the always-connected communication method is adopted, a server capability capable of communicating with all monitored devices is required.
On the other hand, in the remote monitoring system 1 of the present invention, by adopting the emergency connection communication method, the communication is substantially performed in about several percent of the total number of monitoring targets. Therefore, the capacity (communication capability) of the relay server RS can be suppressed. For example, when communication is performed about once a month between the monitoring terminal MT11 and the monitoring target device ME11, the communication between the monitoring terminal MT12 and the monitoring target device ME11 is performed between the monitoring terminal MT12 and the monitoring target device ME11. It is only necessary to prevent communication between them. The communication between the monitoring terminal MT11 and the monitoring target device ME11 is started after the communication between the monitoring terminal MT12 and the monitoring target device ME12 is completed.

Since the remote monitoring system 1 of the present invention employs the emergency connection communication method, the IP address assigned to the monitoring target device is acquired for each communication, and the network connection using the IP address is performed.
Further, since the remote monitoring system 1 of the present invention adopts the emergency connection communication method, the IP address of the monitoring target device changes every time the connection is made. The monitoring terminal acquires the IP address of the monitoring target device every time it is connected.

1 Remote monitoring system MT1 Monitoring terminal MT1A Request information transmission unit MT1B Communication unit MT2 Monitoring terminal RS Relay server RSA Request information relay unit RSB Response information reception unit RSC Identification information verification unit RSD Relay unit RSE Monitoring terminal selection unit NW1 First network NW2 2 network ME1 monitored device ME1A first communication unit ME1B second communication unit ME2 monitored device

Claims (4)

A remote monitoring system for remotely monitoring a plurality of monitored devices via a network,
Request information for requesting notification of first identification information for identifying the monitored device in the network, second identification information for identifying the monitored device in a second network having a communication protocol different from that of the network. A request information transmission unit that transmits to the monitoring target device by communication via the second network by the call used;
A response that includes the first identification information and the second identification information of the monitoring target device and that is returned from the monitoring target device in response to the request information transmitting unit transmitting the request information A response information receiving unit for receiving information;
An identification information collating unit that collates the second identification information included in the response information received by the response information receiving unit and the second identification information transmitted by the request information transmitting unit;
Based on the verification result of the identification information verification unit, the first identification information included in the response information is used as the first identification information of the monitored device, thereby communicating with the monitored device via the network. A communication unit
A remote monitoring system comprising: The first identification information is an Internet protocol address,
The remote monitoring system according to claim 1, wherein the second identification information is a telephone number. A monitoring terminal and a relay server;
The request information transmission unit is provided in the monitoring terminal,
The remote monitoring system according to claim 1, wherein the identification information matching unit is provided in the relay server. The relay server is
The remote monitoring system according to claim 3, further comprising: a monitoring terminal selection unit that selects, from among the plurality of monitoring terminals, the monitoring terminal that communicates with the monitoring target device based on information indicating an operation status of the monitoring terminal. .

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