JP2001203824A - Network control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a telegraphic message to a center terminal, even if it is a member's net contract. SOLUTION: When a network control unit 3 is to transmit a telegraphic message to a center terminal 1, an incoming number generating means 8 reads the presence/absence of correspondence to member's information in a members storage means 9. Thus, in the case of presence of correspondence to the member' s information, the incoming number generating means 8 adds '0' to the head of the telephone number of the center terminal and can transmit the message to the center terminal 1, while including it in the incoming number information of SETUP.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated digital communication service (hereinafter referred to as "I") for terminal equipment such as meters and equipment.
The present invention relates to a network control device for connecting and communicating with a remote management device via a line (referred to as an SDN).

[0002]

2. Description of the Related Art Today, meters (eg, gas meters, water meters,
2. Description of the Related Art A system for performing automatic meter reading of a power meter or the like, reporting a gas leak, or the like, reporting a failure of equipment (eg, an air conditioner, a lighting device, etc.) or performing a remote diagnosis, etc., is becoming popular. No.). A method using a user information notification service provided by Nippon Telegraph and Telephone Corporation for this communication method has been considered (Japanese Patent Laid-Open No. 4-113759). FIG. 10 is a block diagram of a general network controller. FIG. 11 is a communication sequence diagram of a conventional network control device, and FIG. 12 is a communication sequence diagram when a members net contract is made.

[0003] In FIG. 10, reference numeral 1 denotes a center terminal for automatically reading or remotely controlling a gas meter 4a as a terminal device connected to a network control device 3 via an ISDN line 2;
An SDN line, 4a is a gas meter as a terminal device for integrating and measuring a gas flow rate and shutting off a gas valve for detecting an abnormality of the gas flow rate, pressure, etc. The communication between the terminal 1 and the gas meter 4 using the inter-user information notification service is controlled, and a message to be transmitted to the center terminal 1 is divided into a message length that can be transmitted by the inter-user information notification service, and is continuously transmitted. A network control device that combines and analyzes messages received continuously from the terminal 1. The network control device 3 includes a line interface 5, a terminal interface 6, a communication relay unit 7, and a called number generation unit 8. Line interface 5
Controls the communication with the center terminal using the ISDN line 2, the terminal interface 6 controls the communication with the gas meter 4a as the terminal device, and the communication relay means 7 controls the communication between the line interface 5 and the terminal interface 6. And
The called number generating means 8 generates called number information of a call setting message for transmitting a message to the center terminal 1.

Next, the operation of a general network controller will be described with reference to FIG.

[0005] When reading the gas meter 4a from the center terminal 1, a meter reading request message is sent to a call setting message (hereinafter, referred to as a "call setting message").
(Referred to as SETUP), and transmits to the network control device 3. When the line interface 5 of the network control device 3 receives the SETUP, the line interface unit 5 transmits the user / user information included in the SETUP to the communication relay unit 7. The communication relay means 7 converts the meter reading request message extracted from the user / user information into a communication protocol that can be received by the gas meter 4a, and transmits the communication protocol to the gas meter 4a via the terminal interface 6. The gas meter 4a that has received this transmits it to the communication relay means 7 via the terminal interface 6, so that the communication relay means 7 includes the meter reading response message in the USER user information and the called number generation means 8 outputs SET received from
The telephone number “012345” of the UP calling number information is directly entered into the SETUP called number information to be transmitted to the center terminal 1. As a result, a meter reading response message is transmitted to the center terminal 1, and the center terminal 1 can perform meter reading of the gas meter 4 installed at a remote place. When the gas meter 4 a notifies the center terminal 1 of the gas leak report, it transmits a call request message to the terminal interface 6. Upon receiving this, the communication relay means 7 transmits a terminal call message to the center terminal 1 via the ISDN line 2 by controlling the line interface 5. This allows the center terminal 1 to know that a gas leak alarm has occurred and dispatch a staff member.

[0006]

However, the conventional network control device has the following problems. One of the Nippon Telegraph and Telephone Corporation's ISDN line services is the Members Net Service. Member's Net Service is a service that does not require special equipment and can construct a private network like a dedicated line while using a public network. In the case of an ISDN line subscribed to the Member's Net service, when a call is made to a party other than those registered in the Member's Net group, "0" must be added to the head of the other party's telephone number to make a call.

[0007] In the conventional network control device, as shown in FIG. 11, the SE sent from the center terminal to transmit a message is sent.
The TUP calling number information is temporarily stored, and when transmitting a response message to the center terminal, the calling number information is set to SETUP.
Was communicated with the center terminal by putting it in the called number information, but if the ISDN line to which the network control device was connected has subscribed to the members network service, the SETUP received when the response message was sent to the center terminal. Calling number information
SETUP trying to send to send response message
No. "0" indicating the other party other than the members net group is not added to the head of the telephone number of the called number information because the same telephone number is put in the called number information of the called number. Therefore, I
The exchange on the SDN line mistakenly recognizes "0", which is a part of the area code, as being a "0" call indicating a destination other than the member's net group registration. The phone number is identified except for "0",
Reason display value # 28 as telephone number format error
A disconnection message (hereinafter referred to as DISC) to which the (invalid number format) is added is transmitted to the network controller and SE
Does not accept TUP. Therefore, the SETUP sent by the network controller to send the response message to the center terminal is ISD
It is rejected by the N-line exchange and does not reach the center terminal. That is, communication with the center terminal cannot be performed normally. If a telephone number without an area code is set in the called number information, the exchange mistakenly recognizes the call as originating in the members net group, and cannot transmit SETUP to the center terminal.

Further, in the terminal call communication from the network control device to the center terminal, the terminal call message cannot reach the center terminal, so that the terminal call communication cannot be performed.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a line interface for controlling communication with a center terminal using an inter-user information notification service, and a terminal interface for controlling communication with a terminal device. And communication relay means for controlling communication between the line interface and the terminal interface, and communication with a setting device connected to the terminal interface to set members information which is information on whether or not a member net is supported. Together with members storage means for storing members information;
If the member information stored in the member storage means is compatible, "0" is added to the beginning of the telephone number of the center terminal and the number is added to the called number information of the call setting message transmitted to the center terminal, and the member information is added. If there is no correspondence, a destination number generating means for directly adding the telephone number of the center terminal to the destination number information of the call setting message without adding "0".

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a line interface for controlling communication with a center terminal using an inter-user information notification service, a terminal interface for controlling communication with a terminal device, the line interface and the terminal. Communication relay means for controlling communication with the interface, and members for setting members information which is information as to whether or not the terminal supports the members net by communicating with the setting device connected to the terminal interface, and storing the members information. When the member information is associated with the storage means and the member storage means, a prefix “0” is added to the head of the telephone number of the center terminal, and the number is included in the called number information of the call setting message transmitted to the center terminal, When the member information is not supported, the telephone of the center terminal is added without adding "0". Consisting of a destination number generating means to take into called number information of the call setup message to No.. If the ISDN line to which the network control device is connected has a member's net contract, a "0" is added to the head of the telephone number of the center terminal and a call setup message is transmitted to the center terminal. The network controller sends a call setup message to the center terminal without adding
Normal communication with the center terminal is possible regardless of non-contract.

When the line interface receives the disconnection message including the predetermined reason indication value, the member information stored in the members storage means is updated to "not supported" and another predetermined cause indication value is set. And a reason display monitoring means for updating the member information to the corresponding state when a disconnection message including the message is received. Then, the reason display monitoring means checks the reason display value of the disconnection message transmitted from the ISDN line to determine the contract / non-contract of the MembersNet, and to add the "number" to the called number information of the call setting message to the center terminal. By determining the addition or non-addition of "0", the network control device can automatically support the members net.

[0012] Further, upon receiving the member information setting request message from the center terminal, the communication relay means sets the member information of the setting request message in the members storage means before transmitting a response message to the center terminal. Then, by changing the member information stored in the members storage means before transmitting the response message to the center terminal, if the center terminal changes to the corresponding by the setting request message, the response number is changed to the called number in the call setting message of the response message. Is added with "0", so that a response message can be normally returned to the center terminal even with an ISDN line with a members net contract.

Also, the member information added to the destination subaddress information of the call setting message transmitted from the center terminal is set in the member storage means. Then, even if the message transmitted first from the center terminal is not the member information setting request message, the members information stored in the members storage means can be changed.

Further, the number of retries of the call setting message transmitted at the start of the terminal call communication to the center terminal is counted, and when the number of retries reaches a predetermined number, the member information stored in the members storage means is updated. There is provided a terminal call monitoring means for changing to "none" when there is a correspondence and changing to "yes" when the members information does not correspond. Then, without setting the member information using the center terminal or the setting device, the SEDN to the center terminal can be performed even on the ISDN line subscribed to the members net.
TUP transmission becomes possible.

Further, the line interface is provided with a line detecting means for detecting whether or not the ISDN line is in a connected state and for notifying the detection result to the communication relay means, and the communication relay means notifies that the ISDN line is connected. Then, a call setup message is transmitted to a predetermined call destination, and the ISD
When the disconnection message is received from the N line with the predetermined reason display value, the member information is set to correspond, and when the disconnection message of another predetermined reason display value is received, the member information is set to no correspondence. Perform members net detection processing. When the network control device is connected to the ISDN line, the line detecting means detects the connection, and the communication relay means performs a contract / non-contract detection process for the members net of the ISDN line. Normal communication with the center terminal can be performed immediately after installation of the network control device.

The communication monitoring means counts the number of communication failures with the center terminal, and requests the communication relay means to perform a members net detection process when the number of failures exceeds a predetermined number. Even if the member's net contract is changed after the network controller is connected to the ISDN line, the number of communication failures with the center terminal is counted by the communication monitoring means, and the member's net detection processing is performed when the predetermined number of failures has occurred. Since the request is made to the communication relay means, it is possible to normally communicate with the center terminal even if the contract of the members net is changed in the middle.

The communication relay means is an ISDN line to which the network control device itself is connected to the destination of the call setting message for performing the members net detection processing. The SETUP transmission destination for detecting the membership of the member network of the ISDN line to which the network control device is connected is addressed to the ISDN line to which the network control device itself is connected. There is no need to prepare ahead.

The communication relay means, upon receiving a member net detection request message requesting the member net detection processing from the center terminal, performs the member net detection processing of the ISDN line. When the response message from the network control device is no longer returned, the center terminal transmits a request message to the network control device to request the members to perform the member's net detection process. This can be performed by the control device.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a block diagram of a network control apparatus according to Embodiment 1 of the present invention. FIG. 2 is a communication sequence diagram of the network control device in the present embodiment.

In FIG. 1, reference numeral 1 denotes a gas meter 4a serving as a terminal device connected to a network control device 3;
Terminal for automatic meter reading and remote control via
The DN line 3 controls communication using a user information notification service between the center terminal 1 and the gas meter 4a, and divides a message transmitted to the center terminal 1 into a message length that can be transmitted by the user information notification service. 4a is a network control device that transmits and transmits data continuously and combines and analyzes messages that are continuously received separately from the center terminal 1. The terminal 4a integrates and measures the gas flow rate, and shuts off a gas valve that detects an abnormality such as gas flow rate and pressure. A gas meter 4b is a setting device for setting data in the network control device 3.

The network controller 3 comprises a line interface 5, a terminal interface 6, a communication relay means 7, a called number generation means 8, and a members storage means 9. The line interface 5 controls communication with the center terminal 1 using the inter-user information notification service. The terminal interface 6 controls communication with the terminal devices 4a and 4b. The communication relay means 7 comprises a line interface 5 and a terminal interface 6
Control communication with The called number generating means 8 adds "0" to the head of the telephone number of the center terminal 1 when the members information is available from the members storage means 9 and puts it in the called number information of the call setting message transmitted to the center terminal 1. At the same time, if the members information does not correspond, the telephone number of the center terminal 1 is directly entered into the called number information of the call setting message without adding “0”. Members storage means 9
Is set with members information as information as to whether or not it corresponds to the members net by communicating with the setting unit 4b connected to the terminal interface 6, and stores the members information.

Next, the operation and operation will be described. When the contractor connects the network control device 3 to the ISDN line 2, if the ISDN line 2 has a membership network contract, the contractor connects the setting device 4b to the terminal interface 6 of the network control device 3. The members information in the members storage means 9 is set to correspond. When reading the gas meter 4a from the center terminal 1, the meter reading request message is sent to the SETU.
The information is transmitted to the network control device 3 while being included in the P user / user information. The line interface 5 of the network controller 3 is SETUP
Is received, the line interface means 5 sets
Is transmitted to the communication relay means 7, and the communication relay means 7 converts the meter reading request message extracted from the user / user information into a communication protocol that can be received by the gas meter 4a, and converts it via the terminal interface 6. Transmit to the gas meter 4a.

The gas meter 4a that has received this transmits it to the communication relay means 7 via the terminal interface 6, so that
The communication relay means 7 transmits the meter reading response message to the SETUP user.
Put in user information. At that time, the called number generation means 8 reads the correspondence of the members information in the members storage means 9. Setting device 4b when connecting to ISDN line 2
Since the member information is set to correspond, the called number generating means 8 sets the telephone number “0” of the center terminal 1 to “0”.
"0" is added to the beginning of "12345" to form "001234".
"5" is included in the SETUP destination number information for sending a meter reading response message and transmitted to the center terminal 1, so that the center terminal 1 can read the gas meter 4 installed at a remote place.

When the gas meter 4a notifies the center terminal 1 of a gas leak report, it transmits a call request message to the terminal interface 6. Communication relay means 7 receiving this
Transmits a terminal call message to the center terminal 1 via the ISDN line 2 by controlling the line interface 5.
Also at this time, the called number generation means 8 reads the correspondence of the member information in the members storage means 9 and determines whether or not there is correspondence.
b, the member information is set to correspond, so that the called number generation means 8 outputs the telephone number "01" of the center terminal 1.
"0" is added to the head of "2345" to form "001234".
"5" is transmitted to the center terminal 1 in the called number information of SETUP. By doing so, the center terminal 1 knows that a gas leak alarm has occurred and can dispatch a staff member. It should be noted that the number added to the head of the telephone number of the center terminal 1 is not "0" but may be "1" or "9".

(Embodiment 2) FIG. 3 shows a block diagram of a network control apparatus according to Embodiment 2 of the present invention. FIG. 4 is a communication sequence diagram of the network control device in the present embodiment.

In FIG. 3, when the line interface 5 receives the disconnection message including the cause display value # 28, the members information stored in the members storage means 9 is updated to no correspondence, and the cause display value # 1 (missing number) is updated. ),
When the disconnection message including # 28 is received, the reason information monitoring means 10 is provided to update the member information to the corresponding state. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. When the gas meter 4 a notifies the center terminal 1 of the gas leak report, it transmits a call request message to the terminal interface 6.
Upon receiving this, the communication relay means 7 switches to the line interface 5
To control the center terminal 1 via the ISDN line 2.
SEUT including terminal call message in user / user information
Send P. If the ISDN line 2 is a member's net contract, the member storage means 9
If the member information of the center terminal 1 is set to "no correspondence", the called number generation means 8 will call the telephone number "012345" of the center terminal 1.
Without the addition of "0" at the beginning of the destination.

In this case, after receiving the call setting acceptance message (hereinafter referred to as CALL PROC), the network control device 3
The DISC including the cause value # 28 is received. The reason display monitoring means 11 outputs the DI including the reason display value # 28.
Upon recognizing the SC reception, the member information stored in the member storage means 9 is changed from "not supported" to "present". Since the gas meter 4a in which the terminal call communication to the center terminal 1 has failed transmits the call request message to the network control device 3 again, the member information of the members storage means 9 is set to correspond from the next communication. Can communicate normally with the center terminal 1, and the center terminal 1 can know that a gas leak alarm has occurred and dispatch a staff member. If the reception of the DISC including the reason display values # 1 and # 28 is recognized, the members information stored in the members storage means 9 is changed from "corresponding" to "no". Since the gas meter 4a in which the terminal call communication to the center terminal 1 has failed transmits the call request message to the network control device 3 again, the member information of the members storage means 9 is set to be unsupported from the next communication. , Can communicate normally with the center terminal 1.

(Embodiment 3) FIG. 3 is a block diagram of a network control apparatus according to Embodiment 3 of the present invention.

In FIG. 3, upon receiving a member information setting request message from the center terminal 1, the communication relay means 7 stores the member information of the setting request message in the member storage means 9 before transmitting a response message to the center terminal 1. It is set.

Next, the operation and operation will be described. When the network control device 3 is connected to the ISDN line 2, if the ISDN line 2 has a contract for the members net service, the center terminal 1 transmits a member information setting request message. The communication relay means 7 of the network control device 3 which has received this sets the member information of the member storage means 9 to correspond. Then, a response message is transmitted to the center terminal 1 to notify the center terminal 1 that the members information has been set in the members storage means 9. At this time, since the members information in the members storage means 9 has already been corresponded, the SETUP containing the response message to the center terminal 1 is stored.
Since the telephone number of the called number information is prefixed with “0”, the response message can be transmitted to the center terminal 1 normally.

(Embodiment 4) FIG. 3 is a block diagram of a network control apparatus according to Embodiment 4 of the present invention. FIG. 5 is a communication sequence diagram of the network control device in the present embodiment.

In FIG. 3, members information added to destination subaddress information of a call setup message transmitted from the center terminal 1 is set in the members storage means 9. The components having the same reference numerals as those of the third embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. When the ISDN line 2 to which the network control device 3 is connected has a member net service contract, the destination subaddress information of the message transmitted in the first communication from the center terminal 1 to the network control device 3 includes “−”. 1 ”. The communication relay unit 7 of the network control device 3 uses the SE received from the center terminal 1.
When "-1" is added to the destination sub-address information of the TUP, the communication relay unit 7 sets the members information in the members storage unit 9 to correspond. That is, the member information can be set even if the message transmitted first from the center terminal 1 is not the member information setting request message. Although the members information is set by the destination sub-address information, it can be similarly implemented by adding it to the calling sub-address information or the user / user information without a message.

(Embodiment 5) FIG. 6 shows a block diagram of a network control apparatus according to Embodiment 5 of the present invention. FIG. 7 is a communication sequence diagram of the network control device in the present embodiment.

In FIG. 6, the number of retries of the call setting message transmitted at the start of the terminal call communication to the center terminal 1 is counted, and when the number of retries becomes two, the member information stored in the members storage means 9 The terminal call monitoring means 13 is changed to "none" when the member information is not supported, and is changed to "none" when the member information is not supported. The components having the same reference numerals as those of the fourth embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. When the gas meter 4 a notifies the center terminal 1 of the gas leak report, it transmits a call request message to the terminal interface 6.
Upon receiving this, the communication relay means 7 switches to the line interface 5
To control the center terminal 1 via the ISDN line 2.
SEUT including terminal call message in user / user information
Send P. If the ISDN line 2 is a member's net contract, the member storage means 9
If the members information of the center terminal 1 is set to "no", the called number setting means 10 sets the telephone number "01234" of the center terminal 1.
Set the called number information without adding “0” at the beginning of “5”.
Put in P. In this case, after receiving the call setting acceptance message (hereinafter, referred to as CALL PROC), the network control device 3 receives the DISC including the cause display value # 28, and the terminal call communication fails. After a while, the network control device 3 starts a retry operation in an attempt to call the center terminal 1, but does not add "0" to the head of the telephone number in the called number information. Will fail. The terminal call monitoring means 12 monitors the number of failures, and when the number of terminal calls becomes two, changes the member information in the members storage means 9 to corresponding. Then, in the second retry process, since the members information stored in the members storage means is associated, the destination number setting means 10 sets "0" at the beginning of the telephone number of the center terminal 1.
Is added, terminal call communication can be performed normally.

(Embodiment 6) FIG. 8 is a block diagram of a network control apparatus according to Embodiment 6 of the present invention.

In FIG. 8, the line interface 6 is provided with a line detecting means 12 for detecting whether or not the connection is established with the ISDN line 2 and notifying the communication relay means 7 of the detection result. When the connection is notified, a call setup message is transmitted to a predetermined call destination, and when a disconnection message is received from the ISDN line 2 with a predetermined reason display value, the member information is set to be compatible and When a disconnection message of another predetermined reason display value is received, a member's net detection process of setting member information without any correspondence is performed. The components having the same reference numerals as those of the fifth embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. When the network control device 3 is connected to the ISDN line 2, the line detecting means 13 detects that the connection has been made to the ISDN line 2. Then, the connection is notified to the communication relay means 7. The communication relay means 7 transmits SETUP to a predetermined call destination without adding "0" at the head of the telephone number to a predetermined call destination. If the ISDN line 2 has subscribed to the members net, the communication relay means 7 sets the members information in the members storage means 9 to "corresponding" since the ISDN line 2 receives the DISC having the reason display value # 28. If the SETUP transmission is successful, set the members information to none. It should be noted that the present invention can be similarly implemented even when the predetermined call destination is the center terminal.

(Embodiment 7) FIG. 9 is a block diagram of a network control apparatus according to Embodiment 1 of the present invention.

In FIG. 9, a communication monitoring means for counting the number of communication failures with the center terminal 1 and requesting the communication relay means 7 to perform a members net detection process when the number of failures exceeds a predetermined number is provided. Things. The components having the same reference numerals as in the sixth embodiment have the same structure, and the description will be omitted.

Next, the operation and operation will be described. The communication monitoring means 14 monitors the number of communication failures with the center terminal 1 by the network control device, and requests the communication relay means 7 to detect a members net if the number of communication failures exceeds a predetermined number. The communication relay means 7 sends a call to a predetermined destination.
Perform ETUP transmission. If the ISDN line 2 has subscribed to the members net, D indicating the reason display value # 28
Since the ISC is received, the communication relay unit 7 sets the members information in the members storage unit 9 to correspond. If the SETUP transmission is successful, the member information is set to no correspondence.

(Embodiment 8) FIG. 9 shows a block diagram of a network control apparatus according to Embodiment 1 of the present invention.

In FIG. 9, the communication relay means 7 changes the transmission destination of the call setting message for performing the members net detection processing to the ISDN line 2 to which the network control device 3 itself is connected.
It is. The components having the same reference numerals as those of the seventh embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. When the communication relay means 7 detects whether or not the ISDN line 2 to which the network control device 3 is connected has a contract with the members net, the SETUP transmission destination is to the ISDN line to which the network control device 3 itself is connected. To do.

(Embodiment 9) FIG. 9 is a block diagram showing a network control apparatus according to Embodiment 1 of the present invention.

In FIG. 9, when receiving a member net detection request message requesting a member net detection process from the center terminal 1, the communication relay means 7 performs a member net detection process of the ISDN line 2. The components having the same reference numerals as those of the eighth embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. When a response message is not received at all from the network control device 3 no matter how many times the request message is transmitted from the center terminal 1, the center terminal 1 transmits a members net detection request message to the network control device 3. When the network controller 3 receives this member's net detection request message, the communication relay means 7 performs SETUP transmission to a predetermined call destination. If the ISDN line 2 has subscribed to the members net, the SETUP transmission fails, so the communication relay unit 7 sets the members information in the members storage unit 9 to correspond. If SET
If the UP transmission is successful, the member information is set to no correspondence.

[0051]

As apparent from the above description, according to the network control device of the present invention, the following effects can be obtained.

(1) If the ISDN line to which the network control device is connected is a member's net contract, a "0" is added to the head of the telephone number of the center terminal, a call setting message is transmitted to the center terminal, and a non-contract is made. At times, by transmitting a call setup message to the center terminal without adding “0”, the network control device can normally communicate with the center terminal regardless of whether or not a member's net contract is made.

(2) The reason display monitoring means checks the reason display value of the disconnection message transmitted from the ISDN line to determine whether the member's net is contracted or not, and determines the called number of the call setting message to the center terminal. By determining whether "0" is added or not added to the information, the network control device can automatically perform the member's net correspondence.

(3) By changing the members information stored in the members storage means before sending the response message to the center terminal, if the center terminal changes to the corresponding by the setting request message, the call setting message of the response message Since "0" is added to the destination number in, a response message can be normally returned to the center terminal even on an ISDN line with a members net contract.

(4) Even if the message transmitted first from the center terminal is not the member information setting request message, the members information stored in the members storage means can be changed.

(5) SETUP transmission to the center terminal becomes possible even on the ISDN line with which the members net is contracted without setting the members information by the center terminal or the setting device.

(6) When the network control device is connected to the ISDN line, the line detecting means detects the connection, and the communication relay means detects the contract / non-contract of the members net of the ISDN line. It is possible to perform normal communication with the center terminal immediately after the installation of the network control device without performing the setting.

(7) Even if the member's net contract is changed after the network controller is connected to the ISDN line, the number of communication failures with the center terminal is counted by the communication monitoring means. Request to the communication relay means, so that normal communication with the center terminal can be performed even if the member's net contract is changed in the middle.

(8) ISD to which the network controller is connected
SE for detecting the member's net contract of N line
The TUP destination is the ISD to which the network controller is connected.
Since it is addressed to the N line, there is no need to prepare a SETUP transmission destination for detecting a member's net contract.

(9) When the response message from the network control device is no longer returned, the center terminal sends a request message to the network control device to request the network control device to perform a member net detection process. Can be immediately performed by the network control device.

[Brief description of the drawings]

FIG. 1 is a block diagram of a network control device according to a first embodiment of the present invention.

FIG. 2 is a communication sequence diagram of the device.

FIG. 3 is a block diagram of a network control device according to embodiments 2, 3 and 4 of the present invention;

FIG. 4 is a communication sequence diagram of the network control device according to the second embodiment of the present invention.

FIG. 5 is a communication sequence diagram of a network control device according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram of a network control device according to a fifth embodiment of the present invention.

FIG. 7 is a communication sequence diagram of the device.

FIG. 8 is a block diagram of a network control device according to a sixth embodiment of the present invention.

FIG. 9 is a block diagram of a network controller according to embodiments 7, 8, and 9 of the present invention.

FIG. 10 is a block diagram of a conventional network control device.

FIG. 11 is a communication sequence diagram of the device.

FIG. 12 is a communication sequence diagram when the device is subscribed to Members Net.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center terminal 2 ISDN line 3 Network control device 4a Terminal device (gas meter) 4b Terminal device (setting device) 5 Line interface 6 Terminal interface 7 Communication relay means 8 Called number generation means 9 Members storage means 10 Reason display monitoring means 11 Terminal origination Call monitoring means 12 Line detection means 13 Communication monitoring means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Yasui 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Masaaki Sakata 1006 Okadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co. 72) Inventor Fuyuki Abe 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 5K048 AA09 BA36 5K101 KK12 LL03 MM07 PP03 RR12 RR14 TT01

Claims (9)

[Claims] 1. A line interface for controlling communication with a center terminal using an inter-user information notification service, a terminal interface for controlling communication with a terminal device, and controlling communication between the line interface and the terminal interface. Communication relay means, and members storage means for setting members information which is information as to whether or not it corresponds to the members net by communicating with the setting device connected to the terminal interface, and storing members information.
If the member information stored in the member storage means is compatible, "0" is added to the beginning of the telephone number of the center terminal and the number is added to the called number information of the call setting message transmitted to the center terminal, and the member information is added. If there is no correspondence, the network control device comprises a destination number generating means for directly adding the telephone number of the center terminal to the destination number information of the call setting message without adding "0". 2. When the line interface receives a disconnection message including a predetermined reason indication value, it updates the members information stored in the members storage means to no correspondence, and further sets another predetermined cause indication value. 2. The network control device according to claim 1, further comprising a reason display monitoring means for updating the member information to a corresponding one upon receipt of a disconnection message containing the message. 3. The communication relay unit, upon receiving a member information setting request message from the center terminal, sets the member information of the setting request message in the members storage unit before transmitting a response message to the center terminal. Or the network controller according to 2. 4. The network control device according to claim 1, wherein the member information added to the destination subaddress information of the call setting message transmitted from the center terminal is set in the member storage means. 5. A method for counting the number of retries of a call setup message transmitted at the start of terminal call communication to a center terminal, and when the number of retries reaches a predetermined number, the member information stored in the members storage means is updated. The network control device according to any one of claims 1 to 4, further comprising terminal call monitoring means for changing to "none" when there is correspondence and changing to "yes" when members information does not correspond. 6. A line interface for detecting whether or not the ISDN line is connected and notifying the communication relay unit of the detection result, wherein the communication relay unit notifies that the ISDN line is connected. Then, a call setup message is transmitted to a predetermined call destination, and when a disconnection message is received from the ISDN line with a predetermined reason indication value, the member information is set to be compatible and another predetermined information is set. 6. The network control device according to claim 1, wherein when receiving a disconnection message of the reason indication value, the network controller performs a members net detection process of setting members information without correspondence. 7. A communication monitoring means for counting the number of communication failures with the center terminal and requesting the communication relay means to perform a members net detection process when the number of failures exceeds a predetermined number. Network controller. 8. The network control device according to claim 6, wherein the communication relay means transmits the call setting message for performing the members net detection processing to an ISDN line to which the network control device itself is connected. 9. The network control device according to claim 6, wherein the communication relay means performs a members net detection process of the ISDN line upon receiving a members net detection request message requesting the members net detection process from the center terminal.