JP2908539B2 - ISDN communication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ISDN communication system,
More specifically, the present invention relates to an extension transfer method in an ISDN (Integrated Services Digital Network) telephone and an extension transfer method in an ISDN facsimile. For example, the present invention is applied to a configuration system of a sensor and a central monitoring device of a security system in house equipment.

2. Description of the Related Art In a point-to-point connection, the same digital telephone (ISDN telephone) stores the calling party number (Calling Party No.) of another voice call request during a call, and After the call is completed, an automatic call is made with the stored number. For example, JP-A-1-293750
Japanese Patent Application Laid-Open Publication No. H10-209,897 proposes a digital telephone connected to a digital network via a digital subscriber interface. When a call is received from another terminal or from a different terminal during a voice call, the call is issued. A storage means for storing a number, and a rejection means for rejecting another voice call or an incoming call from a different terminal, a selection key for obtaining the calling number stored in the storage means after the end of the voice call, It is provided with a means for automatically transmitting the requested calling number. However, this method is not applicable to point-to-multipoint transfer.

Others recognize the ISDN dial-in or sub-address similarly and switch the telephone call display method. For example, Japanese Unexamined Patent Publication No. 2-126752 discloses an ISDN telephone that identifies an incoming number of an ISDN and enables different incoming states.
Identification means for distinguishing between a first state at the time of calling one-to-one communication to a telephone connected to the ISDN S interface or T interface, and a second state for simultaneously calling a plurality of telephones connected to the interface. A paging is performed by identifying whether the call is in the first state or the second state by the receiving telephone and displaying the incoming call with a different sound or a different visual state accordingly. Whether or not the user can immediately identify the user when receiving an incoming call. However, this method is also unsuitable for internal transfer of point-multipoint connection.

Shortly after the service of ISDN was launched in April 1988, the direction of use has not been sufficiently studied. In particular, it is considered that there are two voice communication lines for use in a general house, and three to four ISDN communication devices are usually installed even in a normal house. These devices may be installed in remote places, such as a living room, a bedroom, a toilet, or a study. Here, the simplest way to transfer a call in progress from the living room ISDN communication device to the study ISDN communication device is to include a call identification information element from the living room ISDN communication device to the ISDN network. Transfer to a call suspended state, and the ISDN communication device in the study
By transferring a resume message in a format not including the call identification information element to the DN network and resuming the call, the transfer can be performed.
However, before transferring a restart message from the study ISDN communication device to the ISDN network, for example, if a restart message not including the call identification information element is transferred from the toilet ISDN communication device, the call can be transferred to the toilet ISDN communication device. The transfer may be made to an unintended device that can be said to be preemptive. This is because, for example, in the case of a two-family house where one ISDN basic line is contracted, bus wiring is performed as a whole, and the line is shared, the frequency of transfer to such unintended equipment will increase. Can be In addition, when the call interruption information element is not included, one call interruption state is possible at a time, and when the call identification information element is included, two call interruption states are possible at the same time. Therefore, two B channels of ISDN are effectively enabled. To use it, it is necessary to use call identification information.

Also, a local network (LAN) that simplifies the wiring system by performing a controller for remotely controlling doors and windows of houses and the like and locking and lighting of the doors is performed by a personal computer (PC). In addition, it is necessary to remove the external storage device of the PC to reduce the cost. This LAN
About "Introduction STARLAN" (AI Publishing
A function called a file server described in Okada ISBN 4-87193-060-2C2055) has been realized,
Means for centrally storing commonly used software have been proposed.

When a plurality of ISDN communication devices having an answering machine function are installed, an answering machine message from a communication partner must be stored in a specific (first) ISDN communication device connected by a common bus. Must be easily known from another (second) ISDN communication device.

Object The present invention has been made in view of the above situation, and has a transfer function within an ISDN basic line, a controller for remotely controlling house facilities, and a means for knowing information generated by another ISDN communication device. It was made to provide an ISDN communication system.

In order to achieve the above object, the present invention provides (1) a line termination unit (DSU) connected to a first common bus by an I interface, and an access interface having a first multipoint type ISDN communication apparatus. And an ISDN communication system connected to the second ISDN communication device, wherein connection means for connecting the two ISDN communication devices via a local area network, and wherein the second ISDN communication device is connected to the first ISDN communication device, ISDN
Storage means for storing communication software necessary for using a network, and communication software stored in the storage means via the local area network when the second ISDN communication device uses an ISDN network. (2) a line termination unit (DSU) is connected to a first common bus via an I interface, and an access interface is a point-multipoint type first ISDN communication device. Communication device and second
In an ISDN communication system connected to an ISDN communication device, connection means for connecting the two ISDN communication devices via a local area network, and communication logging information to the first ISDN communication device via the local area network in a predetermined manner. Or (3) a line termination unit (DSU) is connected to the first common bus via an I-interface and the access interface In an ISDN communication system connected to a first ISDN communication device and a second ISDN communication device in a point-multipoint manner, wherein the two ISDN communication devices are connected by a local area network. Connecting means for connecting, and the call identification area of the call identification information element of the interruption message used by the first ISDN communication apparatus to transition from during the B channel communication to the interruption of the B channel in a predetermined procedure, into a single pattern. Set and suspend message
A first transfer means for transferring to the ISDN network, and a second ISDN communication device for which the first ISDN communication device does not transfer the call in a call interruption state, via the local area network to the second ISDN communication device. The second transfer means for transferring, and the second ISDN communication device, receive the call identification pattern via the local area network, and transition from a call interruption state to a call reconnection state according to a predetermined procedure. In the call identification information element area of the resume message used for performing the communication, the resume message is transferred to the ISDN network and the communication is transited. A reconnection means for reconnecting to the second ISDN communication device. Hereinafter, a description will be given based on examples of the present invention.

FIG. 1 is an overall configuration diagram for explaining an embodiment of an ISDN communication system according to the present invention.
1 is a line termination unit (DSU: Digital Service Unit), 2 is a first common bus, 3 is a first ISDN communication device, 4 is a second ISDN communication device, and 5 is a third ISDN communication device.
ISDN communication device 6 is a second common bus (local area network).

FIG. 2 shows the ISDN communication device and the first
Is a connection diagram of the common bus and the second common bus.
Is a handset for talking, 8 is an ISDN board (I-NC
U), 9 are STARLAN network access units (NAU), 10 is a first common bus, 11 is a second common bus (local area network), and 12 is a PC (Personal C).
omputer) system bus, 13 is a keyboard, 14 is a keyboard controller, 15 is an I / O (input / output) controller main memory computing device, 16 is a video controller, 17 is a DISK controller, 18 is a CRT, 19 is an external storage device (DISK) ).

For the specific operation of the communication procedure in which the ISDN communication device performs the service interface when communicating according to the ISDN procedure, see, for example, "INS Network Service Interfaces 1, 2, and 3" (NTT, 1986.
6. Telecommunications Association).

The layer function includes a layer 1 function for making an electrical connection between terminals via a physical communication path (metallic, optical cable), a layer 2 function having a transmission procedure for correctly transmitting and receiving information between terminals, and It comprises a layer 3 function for controlling and managing network connections, such as setting and releasing a communication path to a requested communication partner, interpreting service contents, and testing a communication path. An apparatus having such a layer 1, layer 2 and layer 3 communication procedure execution function (hereinafter referred to as an ISDN board or an I-NCU) is attached by a method of coupling to a system bus of a personal computer (PC), A handset for calling is connected to the board, and a DSU (Digital Service Unit), which is an interface on the network side of ISDN, is connected to a common bus (first bus) of the I interface.
This is called a point-multipoint connection.

Also, a STARLAN network access unit (NAU) for performing data transmission is similarly coupled to the system bus of the PC, and the IN side and the OUT side of the NAU are connected to a common bus (second common bus) of the STARLAN system. .

A feature of ISDN is its comprehensive service that provides various voice and non-voice communication services on the same network. The key to realizing service integration is a standardized user / network interface shared by various services, that is, an I interface.

Even if various services of telephone and non-telephone systems are provided in a unified manner, not all users equally request communications from a low speed of several tens of bps to an ultra-high speed of several hundred Mbps, for example. It is more convenient from an economic point of view to group the user / network interfaces. On the other hand, from the original purpose of ISDN, it is desirable to limit the types of interfaces as much as possible so that they can be adapted to a wide range of purposes, and a new user / network interface for ISDN is serialized under both conditions. This new user-network interface is the I-interface.

In order to realize the user / network interface, the basic conditions for configuring the I interface are as follows.
Summarized into points.

Can be used commonly for various telephone / non-telephone services and existing / new services (multi-service).

To enable not only one-to-one wiring but also one-to-n wiring configuration such as bus wiring (multi-point).

Enable terminal socket connection.

Under these conditions, the I-interface can be used regardless of the type and number of terminals and the location of use.

3 (a) and 3 (b) show the ISDN board (I-NCU) and STA
FIG. 3A is a diagram showing a memory address map of an RLAN network access unit (NAU), in which FIG. 3A shows a memory address map of 1-NCU, and FIG. 3B shows a memory address map of NAU. Both share the main memory of the PC itself.

It goes without saying that the IRQ value and the I / O address value of the interrupt number are also set appropriately. Three sets of ISDN communication devices having this configuration are configured as first, second, and third ISDN communication devices, respectively.

First, the initial operation of the third ISDN communication device is performed, the PC body and the I-NCU are connected to the network according to a predetermined procedure, the NAU is initialized according to the predetermined ISDN procedure, and the ISD
N Communication device starts file server function.

Next, the initial operation of the first ISDN communication device is performed, and after the PC body and NAU are initialized and the PC starts the server function, software necessary for initializing the I-NCU is transferred to the third ISDN communication device. Transferred from the external storage device of the communication device, the I-NCU is connected to the network according to a predetermined ISDN procedure. However, information unique to the first ISDN communication device, such as a subaddress and a setting number for dial-in, is transferred from the external storage device of the own device, and the I-NCU is initialized.

The initial operation of the second ISDN communication device is the same as the initial operation of the first ISDN communication device.

An event generated by a predetermined procedure of ISDN is prompted at a transition point of the call state number of the ISDN communication device.
The event at this transition point is stored as a system logging file in the external storage device of the third ISDN communication device in the communication logging information format example shown in FIG. The storage means is set as a shared storage device for the external storage device of the third ISDN communication device.

Also, the first and second ISDN communication devices are:
By retrieving the communication logging information stored in the third ISDN communication device, the call states are mutually recognized.

In the example of the communication logging information format shown in FIG. 4, the device name information is the unique name of the ISDN communication device, the channel information is B1, B2, D channel display, and the logging occurrence time information is the ISDN communication device that generated the logging. CALLED PARTY NO. And CALLING PA
The RTY NO. Holds the NO. Included in the SETUP message in the ISDN communication device, the call status number is the call status number of the ISDN communication device, and the cause information is CA.
This is set when a layer 3 message including a USE information element is transmitted and received.

 The procedure for interrupting and reconnecting an ISDN call is as follows.

The call reconnection (interruption / resumption) procedural element defines layer 1 and / or layer 2 reconnection after the call transitions to the "communicating" state. It is limited to application on the same interface structure and presupposes reconnection on the same information channel. Invoking this procedure at the user-network interface can be used to perform several operations, such as:

Physical disconnection and reconnection of user equipment, physical replacement of one user equipment by another equipment, user moving from one equipment to another, holding a call at the same user equipment and subsequent reconnection activation.

These steps have only local significance. That is, a request to suspend or resume a call affects only the state of the requesting side and does not affect the other side.

The call interruption procedure is as follows: the user sends an "interruption" message containing the current call number to the network, starts timer T319,
It is started by transitioning to the “suspend request” state. The user can optionally include in this message a bit sequence that is used as a call identification for subsequent resumption, to inform the user or the network. If the call identification information by the user is not included (for example, the "call identification" information element is absent or has no content), the network shall be reopened only by the procedure transmitted without the call identification information. Remembers this.

In the call suspended state, the network enters the 'suspend requested' state upon receipt of the 'suspended' message. After confirming the received call information, the network sends an "interruption confirmation" message to the user. Then the network starts timer T307.

At this point, the network assumes that the call reference has been released and transitions to an 'empty' state for the call reference.

The call identification corresponding to the suspended call is stored by the network. The network will not accept another break until it is released.

The connected information channel is held by the network until the call is reconnected (or until a release reason occurs, for example, when timer T307 expires). A “notification” message including a “notification identifier (# 0: user interrupted)” information element is sent to the communicating partner user.

When the user receives the "interruption confirmation" message, the user stops the timer T319, releases the information channel and the call reference, and transitions to an "empty" state. After receiving the “interruption confirmation” message, the user may disconnect the data link connection in use. If the user physically leaves the interface without disconnecting the data link connection, the standard data link layer procedure is started by network side data link layer monitoring and the data link connection is disconnected.

Upon receipt of the "interrupt" message, the network may indicate "reason indication (# 8) if the information contained in the" interrupt "
4: Suspend call identification number in use) Responds by sending a "suspend rejection" message containing the "information element."

In particular, this may be the case if, on a given user-network interface, a "pause" message is received with a call identification already in use, or the "pause" message does not contain any call identification sequence and that interface Applies when null call identification is already assigned in.

Upon receiving the “interruption rejection” message, the user stops the timer T319 and transits to the “busy” state. Timer
If T319 has expired, the user notifies the user application and transitions to the "calling" state. In this case, the state of the call does not change in the network. That is, it remains in the “communicating” state.

At the connection end where the suspension was initiated, after the physical re-establishment of the terminal, the user sends a "resume" message containing the call identification used at the time of the suspension of the call, starts the timer T318 and sends a 'restart request'. 'Restarting the call can be requested by transitioning to the state. If a "suspend" message does not include a "call identification" information element, the corresponding "resume" message also does not include a "call identification" information element. The call number contained in the "resume" message is selected by the user according to the normal assignment of outgoing calls.

Upon receiving the "Resume" message, the network enters the 'Resume Request' state. After confirming the call acknowledgment for the suspended call, the network sends a "resume confirmation" message to the user, releases the call identification, stops timer T307, and transitions to the 'busy' state. The "resume confirmation" message includes a "channel identifier" information element indicating "the desired channel is present and cannot be changed to another channel" to indicate the information channel that has been held for the call by the network.

In addition, the network sends a “notification” message including a “notification identifier (# 1: user restart)” information element to the other user.

The storage of the previously received call identification sequence is not retained by the network after the "resume confirmation" message has been sent. This call identification can be used to make another interruption.

After receiving the “resume confirmation” message, the user stops the timer T318 and transits to the “communicating” state.

In FIG. 7, the call information required for this procedure is transferred from the first ISDN communication device to the second ISDN communication device using the second common bus, and is transferred from the first ISDN communication device to the second ISDN communication device. 2 shows a sequence for performing communication transfer to the server.

FIG. 5 is a diagram showing a call identification information element, and FIG. 6 is a diagram showing an example of a call identification pattern.

17:35 in the example of using the time when the transfer request was received by the first ISDN communication device with the IA5 character string
It represents 40 seconds 00. If the time information uniquely set in the ISDN communication device is not unified, the second ISDN communication device sends the information to the third ISDN communication device.
17:35 to request a transfer to the communication device
In some cases, the information of minute 40.00 is already used, in which case the first ISDN communication device displays an error from the ISDN network and rejects resumption (restart REJEC
T) The message includes the reason display information element, and the reason display # 84 is transferred. Therefore, if only the seventh octet of the above-mentioned call identification pattern is set to “00111000” again and a suspension request is made (not shown), it is successful. It is interrupted.

The extension call, call information element request, and call information element transfer that are transferred on the second common bus in the sequence of FIG. 7 are predetermined procedures of the present system.

The second ISDN communication device sets a layer 3 resume (RESUME) message using the call identification pattern of the call information element, and resumes the B channel for the call interrupted by the first ISDN communication device. .

Effect As is apparent from the above description, according to the present invention, the IS
Of the DN communication devices, the first and second devices can be inexpensive because the capacity of the external storage device can be saved. Also, in the ISDN communication system, the status of other devices and the own device can be easily grasped.

Further, two communication calls can be transferred simultaneously in the ISDN communication system.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an ISDN communication system according to the present invention, FIG. 2 is a connection diagram between an ISND communication device and first and second common buses, and FIG.
FIG. 4 is a diagram showing a memory address map of NCU and NAU, FIG. 4 is a diagram showing an example of a communication logging information format, FIG. 5 is a diagram showing a call identification information element, and FIG. FIG. 7 is a diagram showing an example of the transfer sequence. 1 .... line termination unit (DSU: Digital Service Unit), 2.
... a first common bus, 3 ... a first ISDN communication device, 4 ... a second ISDN communication device,
5 ... third ISDN communication device, 6 ... second
Common bus.

Continuation of front page (58) Fields investigated (Int.Cl. ⁶ , DB name) H04M 11/00-11/10 H04M 1/72 H04M 1/00

Claims (3)

(57) [Claims] 1. A line termination unit (DSU) is connected to a first common bus by an I interface, and an access interface is connected to a first ISDN communication device and a second ISDN communication device in a point-multipoint manner. In ISDN communication system,
Connecting means for connecting the two ISDN communication devices via a local area network;
Storage means for storing, in the communication device, communication software necessary for using an ISDN network, the second ISDN communication device;
An ISDN communication system characterized in that when an ISDN communication device uses an ISDN network, the communication software stored in the storage means is transferred to a second ISDN communication device and used via the local area network. 2. A line termination unit (DSU) is connected to a first common bus by an I interface, and an access interface is connected to a first ISDN communication device and a second ISDN communication device in a point-multipoint manner. In ISDN communication system,
Connection means for connecting the two ISDN communication devices via a local area network; and communication logging information of the first ISDN communication device via the local area network in a predetermined format.
Transferring to an ISDN communication device and storing it in a second ISDN communication device
Communication system. 3. A line termination unit (DSU) is connected to a first common bus by an I interface, and an access interface is connected to a first ISDN communication device and a second ISDN communication device in a point-multipoint manner. In ISDN communication system,
Connecting means for connecting the two ISDN communication devices via a local area network;
The communication device sets the call identification area of the call identification information element of the interruption message used for shifting from the B channel communication to the interruption of the B channel in a predetermined procedure in a predetermined procedure, and transfers the interruption message to the ISDN network. First transfer means, and second transfer means for transferring the call in a state where the first ISDN communication device is in a call interruption state.
Second transfer means for transferring the call identification pattern to the ISDN communication device via the local area network; and wherein the second ISDN communication device receives the call identification pattern via the local area network. Then, in the call identification information element area of the resume message used to transition from the call suspended state to the call reconnection state in the prescribed procedure in a prescribed format, the resume message is transferred to the ISDN network and An ISDN communication system, comprising: reconnection means for transiting and reconnecting an interrupted call of the first ISDN communication device to the second ISDN communication device.