JPH07321844A - Device and system for managing line connection - Google Patents

Abstract

PURPOSE:To perform line connection by shortening the required time because of the success in the connection brought about by line switching can be obtained by performing call control for line connection sequentially in sequence of high priority order based on line number information. CONSTITUTION:When communication network terminal communication fails the line connection, the packet switching control means 4 of the line connection managing device 1 of a transmitting user transmits the line number information of its own terminal to a receiving user by packet switching communication. The device 1 on a receiving user side, when receiving the line number information from one or plural transmitting users by packet switching, preserves it in a storage means 6 by attaching a priority order on the line number information transmitted from a priority order managing means 5. After that, when a state in which the receiving user can perform the line connection by the line switching is set, the line switching control means 3 of the device 1 performs the call control for the line connection by the line switching on each transmitting user in sequence of high priority order based on the line number information managed by the means 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a network communication system using an information communication network capable of both circuit switching type communication and packet switching type communication, and circuit switching between a calling user and a called user. The present invention relates to a line connection management device and a line connection management system for managing a line connection by the.

[0002]

2. Description of the Related Art In recent years, by completely digitizing a communication network, various telecommunication services such as telephone, data communication, facsimile, and image communication, which have been provided separately until now, can be centralized by the same communication network. ISDN (Integrated Services Digital Network) that can be provided to
A network communication system using is built.

In the current ISDN, two communication systems, that is, a circuit switching type communication and a packet switching type communication are adopted. If the above circuit switching type communication is used, a personal computer (personal computer) terminal, G4 (Group 4) type facsimile machine, digital telephone, etc.
Various information such as voice, video and data can be transmitted from the SDN terminal to the destination.

In performing circuit switching type communication in the ISDN, first, in order to establish a line connection between the calling user and the called user, the calling user and the network (ISDN) and the network and the called user are connected. The necessary call control is performed between the line and the line, but at this time, if the line connection by the line exchange cannot be made for some reason such as the line / channel of the called user is not available, the calling user stops the line connection. It is necessary to repeat the call until the communication is given up or the line is connected.

[0005]

For example, a call control for repeated line connection cannot be made to the same called user due to the fact that the called user's line / channel cannot be connected because the line / channel is not available. Considering the case where there are multiple calling users who are performing the call, in the conventional system, even if the line / channel of the called user becomes available, it is not known which calling user succeeds in the line connection.
The line connection is not always performed to the called user in the order in which the connection request is started.

Therefore, in the worst case, a certain calling user may not be able to connect to the line indefinitely, which causes a problem that necessary information is not transmitted to the called user endlessly. To do. In particular, when transmitting important information to the called user, the calling user cannot give up the communication just because the line connection is not successful. Therefore, it is necessary to repeat redialing until the line connection is successful. The burden on the calling user is heavy.

Further, as described above, a plurality of calling users who cannot establish a line connection by circuit switching repeatedly make redialing calls, thereby unnecessarily increasing the load related to call control between the calling users and the network (network. Input traffic to the network may unnecessarily increase), resulting in a decrease in the processing capacity of the network.

The present invention has been made in view of the above, and an object of the present invention is to reliably connect a line between a calling user and a called user without requiring an unnecessarily long time until a line connection by circuit switching is successful. An object is to provide a line connection management device and a line connection management system that enable connection.

Another object of the present invention is to reduce the burden on the calling user as well as to reduce the burden on the calling user, because the calling user does not have to repeat redialing many times until the line connection by circuit switching is successful. It is an object of the present invention to provide a line connection management device and a line connection management system capable of preventing an increase in the input traffic of the device.

Another object of the present invention is to provide an inexpensive line connection management system.

[0011]

According to a first aspect of the present invention, there is provided a line connection management apparatus, which is an information communication network capable of performing both circuit switching communication and packet switching communication, and a plurality of information communication networks connected to the information communication network. The present invention is to be used in a network communication system having a communication network terminal device, and is provided in each communication network terminal device that intends to perform information communication via the information communication network. In order to do so, the following measures are taken.

That is, if the line connection management device cannot make a line connection even though the communication network terminal device has made a call for line connection by circuit switching, the communication is performed by packet switching type communication. Packet switching control means for transmitting the line number information of the network terminal device to the connection destination, storage means for sequentially storing the line number information received by packet switching type communication, and priority of the line number information stored in the storage means. When it becomes possible to connect the priority management means for managing the order and the circuit connection by the circuit switching, the circuit by the circuit switching is arranged in the order of the highest priority based on the line number information managed by the priority management means. Circuit switching control means for sequentially performing call control for connection.

According to another aspect of the present invention, there is provided a line connection management system comprising: an information communication network capable of performing both circuit switched communication and packet switched communication; and a plurality of communication network terminal devices connected to the information communication network. And a first line connection management device provided in the communication network terminal device on the receiving side, which is used in a network communication system for communicating information between communication network terminal devices via the information communication network. And a second line connection management device provided in the communication network terminal device for making a call to the communication network terminal device provided with the first line connection management device. In addition, the following measures are taken.

That is, the second line connection management device is connected to the line despite the fact that the communication network terminal device provided with the second line connection management device makes a call for line connection by circuit switching. If the communication cannot be performed, packet switching control means for transmitting the line number information of the communication network terminal device to the connection destination by packet switching communication is provided. Also, the first line connection management device stores the line number information sequentially received from the second line connection management device by packet switching communication, and the line number information stored in the storage device is prioritized. When it becomes possible to connect the priority management means for managing the order and the circuit connection by the circuit switching, the circuit by the circuit switching is arranged in the order of the highest priority based on the line number information managed by the priority management means. Circuit switching control means for sequentially performing call control for connection.

[0015]

According to the structure of claim 1, a communication network terminal device (hereinafter, referred to as a calling user) equipped with a line connection management device is another communication network terminal device also equipped with the line connection management device. Hereinafter, when a line connection is attempted by circuit switching for the called user), but the line connection fails because the line / channel of the called user is not available, packet switching of the line connection management device of the calling user The control means is adapted to transmit the line number information of the communication network terminal device (self terminal) to the called user by packet switching type communication.

In the line connection management device on the called user side, when the line number information is received by packet switching from one or a plurality of calling users when the line connection cannot be established by circuit switching, the priority management means receives the information. Each of the line number information is prioritized (for example, the one received earlier has a higher priority) and stored in the storage means. Then, after that, when the called user is ready to make a line connection by circuit switching, the circuit switching control means of the circuit connection management device gives a high priority based on the circuit number information managed by the priority management means. The calling users are sequentially connected to each other by line switching (call control).

Therefore, the calling user does not have to repeat redialing (recalling) until the line connection succeeds, unlike the conventional case, even if the line connection by the circuit switching fails, and the line connection from the receiving user side is not required. It is possible to connect the circuit by switching the circuit just by waiting. Therefore, the burden on the calling user side is significantly reduced as compared with the conventional case. Also, the load on call control between the calling user and the information communication network can be reduced.

Further, since the line connection management device on the called user side manages the line number information received from the calling user by prioritizing and managing the line number information, the line connection information with the called user is established after the calling user fails to connect the line. It is possible to reliably connect the line between the calling user and the called user without requiring an unnecessarily long time until the connection is successful, and it is possible to avoid a situation where the line connection cannot be performed forever.

Further, even if there are a large number of outgoing users who cannot make a line connection by circuit switching because a large number of outgoing users are flooded to a certain called user, these large number of outgoing users cannot be connected. Since it is not necessary to repeat redialing until the line connection is successful, it is possible to avoid a situation in which the input traffic to the information communication network unnecessarily increases.

The communication network terminal device having the line connection management device functions as both a calling user and a receiving user.

According to the above configuration, the communication network terminal device on the receiving side is provided with the first line connection management device, and the communication network terminal device on the transmitting side is provided with the second line connection management device. It is provided.

Of the functions of the line connection management device according to claim 1, the first line connection management device gives priority to the line number information sent from the calling side and stores it in the storage means. It has at least a function of a receiving side that performs line connection by circuit switching based on the line number information when line connection by circuit switching becomes possible.

Further, the second line connection management device has, among the functions of the line connection management device according to claim 2, the line number information of its own terminal by packet switching type communication when the line connection by the line switching fails. It has at least a transmitting side function for transmitting a message to the called user.

For example, in a network communication system in which a certain communication network terminal device is only an incoming user and a certain communication network terminal device is only an outgoing user, such as a ticket sales system for a concert or the like, the line connection management system is used. In the case of applying, the communication network terminal device on the called user side is provided with the first line connection management device having only the function of the called side, and the communication network terminal device on the calling user side is provided with only the function of the calling side. Further, the second line connection management device can be provided. In this case, the first line connection management device and the second line connection management device have a simpler structure and lower cost than the line connection management device according to claim 1, so that a low cost line connection management system. Can be built.

[0025]

【Example】

[Embodiment 1] An embodiment of the present invention will be described with reference to FIGS.
The explanation is based on the following.

The line connection management device 1 according to the present embodiment includes various ISDNs such as a digital telephone 100 as shown in FIG. 2, a facsimile device 200 as shown in FIG. 3, or a personal computer terminal 300 as shown in FIG. It is provided in a terminal (communication network terminal device).

The line connection management device 1 basically has
As shown in FIG. 1, a line interface (hereinafter referred to as a line I / F) 2 for controlling input / output of information to / from an ISDN 7 (information communication network), and a line switching control unit for performing call control for circuit switching. 3 (circuit switching control means) and a packet switching control unit 4 for performing call control of packet switching using the D channel
(Packet switching control means) and a priority management section 5 (priority management section) that manages the priority for circuit connection by circuit switching based on the later-described circuit number information received from the packet communication control section 4. And a communication waiting buffer 6 (storage means) for storing the line number information.

Each of the units 2 to 5 constituting the line connection management device 1 is a CPU (Central Proc) (not shown) that executes a predetermined program stored in a memory (not shown).
essing unit), and the communication waiting buffer 6 is composed of the memory having a storage area capable of storing a plurality of line number information.

Here, the CPU for constructing the line connection management device 1 may be an ISDN terminal externally connected using an RS-232C interface or the like, or a CPU included in the ISDN terminal itself. May be That is, the line connection management device 1 of the present invention is
It may be externally connected to the ISDN terminal as an independent unit, or may be built in the ISDN terminal.

When the line connection management apparatus 1 is built in an ISDN terminal, for example, considering a personal computer terminal 300 (see FIG. 4) as an ISDN terminal, the personal computer itself is an ISDN user / network interface. If the personal computer is provided with an interface, the CPU of the personal computer can be used as the CPU configuring the line connection management device 1. When the personal computer does not have an I interface which is a user / network interface for ISDN, for example, the ISDN board is mounted on the extended throttle of the personal computer to configure the personal computer terminal 300. If I
The CPU of the SDN board can be used as the CPU configuring the line connection management device 1.

The line I / F 2 is an I interface which is a user / network interface for ISDN, and is, for example, I.F.I. recommended by the International Telegraph and Telephone Consultative Committee (CCITT). 430 based ISDN basic interface (2 B channels + 1 D channel) or CCITT I.S. An ISDN primary group rate interface based on 431 (23 B channels + 1 D channel) or the like can be used.

Communication between ISDN terminals equipped with the line connection management device 1 having the above configuration will be described below.

At the ISDN terminal which is the calling user,
If a line connection request is issued by circuit switching, this ISD
In the line connection management device 1 of the N terminal, the line switching control unit 3 in FIG. 1 starts call control for line connection by line switching. A basic call control sequence between the calling user, the network (ISDN7) and the called user in this case will be described with reference to FIG. Each message in this basic call control sequence is a layer 3 message located in layer 3 of the OSI (Open Systems Interconnection) reference model.

First, the circuit switching control unit 3 of the calling user
Make a call to the network (send call setup message) (S1),
In response to this call, the network makes an incoming call to the calling user (returning the call setting acceptance message) (S2) and also makes a call to the receiving user (sending the call setting message) (S3).
The called user makes an incoming call (return of a call setting acceptance message) to the outgoing call from the network (S4). In addition, this S4 is
This is performed as necessary, and the called user may not return the call setting acceptance message in some cases. After this, the called user sends a call message to the network (S5), while the network sends a call message to the calling user (S5).
6). Then, the called user sends a response message to the network (S7), and the network sends a response confirmation message back to the calling user (S8) and sends a response message to the calling user (S9). In response to the response message from the network, the calling user returns a response confirmation message to the network (S10). Note that this S10 is performed as necessary, and the calling user may not return the response confirmation message in some cases. After the line connection by the line exchange is completed by the above call control sequence, the data communication is started between the calling user and the called user.

When the line connection is successful as described above, the line connection management apparatus 1 completes the line connection processing.

On the other hand, the case where the line connection is not successful will be described below. For example, as shown in FIG. 6, even if the calling user sends a call setup message to the network in response to the generation of a line connection request by circuit switching (S11), if the line / channel of the calling user is not available, Then, the release completion message is returned to the calling user (S12), and the line connection ends unsuccessfully. In addition to this, the line connection may be unsuccessful due to the communication refusal of the called user or the line abnormality.

When the line connection is not successful as described above, the packet switching control unit 4 of the line connection management device 1 communicates with the called user by packet switching using the D channel, as shown in FIG. Call control for (S2
1). That is, the packet switching control unit 4 makes a call to the network. On the other hand, the network makes a call to the called user, and at this time, the called user makes an incoming call to establish a line connection by D-channel packet switching.

After that, the packet switching control unit 4 performs the packet switching type communication using the D channel to provide the information necessary for the line connection including the line number (ISDN number) of the self (the calling user) (hereinafter, the line number information). Is transmitted to the called user (S22).

In the called user who has received the line number information, the packet switching control unit 4 of the line connection management device 1
The line number information received by the
The priority management unit 5 writes the line number information in the communication waiting buffer 6. Further, at this time, the packet switching control unit 4 transmits the packet in which the line number information is set to the calling user.

Upon receiving the line number information returned from the called user (S23), the packet switching control unit 4 of the calling user determines whether the line number in the received information matches its own line number. It is determined (S24), and if they do not match, the packet in which the own line number information is set is transmitted again to the called user (S22).

The called user rewrites the first line number information written in the communication waiting buffer 6 into the retransmitted line number information, and transmits the packet in which the retransmitted line number information is set to the calling user.

The above-described transmission and return processing of the line number information is repeated between the calling user and the calling user until it is judged that the line number information returned by the calling user is correct.

When the packet switching control unit 4 of the line connection management device 1 on the calling user side determines that the line number information returned from the called user is correct (Y at S24).
ES), the call control for disconnecting the line connection by packet switching is performed to disconnect the line connection (S25).

After this, the calling user enters a standby state (S26). This standby state is continued until the called user then becomes the sender and the call control for the line connection by the circuit switching is performed, that is, until the calling user receives the call setup message from the network (S27). .

After that, when the called user becomes available for line connection by circuit switching due to a vacancy in the called user's line / channel or the like, priority management of the called user's line connection management device 1 is performed. The section 5 reads out the line number information stored in the communication waiting buffer 6 and transfers it to the line switching control section 3. The circuit switching control section 3 performs call control for circuit connection by circuit switching based on the circuit number information.

After this, the same call control as the basic call control sequence shown in FIG. 5 is performed, and when the line connection by the line switching is completed (S28), the communication between the calling user and the called user is established. Be started.

As described above, the line connection management device 1 of the calling user tries the line connection by the circuit switching as usual, and if the line connection by the circuit switching cannot be established with the called user, the D channel is given to the called user. If the line number information is transmitted by packet switching, all that is required is to wait for the line connection from the called user side.

In the line connection management device 1, since a large number of calling users try to connect to the same called user by circuit switching at the same time, such as when selling tickets for concerts, etc. This is very effective when applied when the line / channel of is full and the line connection is difficult. In such a case, the line connection management device 1 of the called user receives a plurality of line number information from a plurality of calling users by packet switching communication using the D channel.

Therefore, the priority management section 5 of the line connection management device 1 manages the received individual line number information by prioritizing it. More specifically, the line number information received earlier is given higher priority, and the line number information is managed in the order of reception. When the called user becomes available for line connection by circuit switching because the called user's line / channel becomes empty, the priority management unit 5 stores the line number information with the highest priority in the communication waiting buffer. The data is read out from 6 and sent to the circuit switching control unit 3 to perform call control for line connection based on the line number information.

As a result, each calling user can surely make a line connection by circuit switching with the called user in the order in which the call is made earlier.

In the above structure, various formats can be considered for the format of the line number information transferred between the calling user and the called user and the structure of the communication waiting buffer 6, but one example of these is shown below. .

First, the format of the line number information transferred between the calling user and the called user is the same as the line number information added to the call setting message when a call is made to the network. For example, ISDN7
When using INS Net 64 or INS Net 1500 of NTT (Nippon Telegraph and Telephone Corporation) as INS,
It has the same format as the "Called Number" information element of the layer 3 protocol of the net service. Then, the line connection management device 1 of the called user writes the line number information in the communication waiting buffer 6 in the above format. This allows
When the called user makes a call to the network later, the line number information can be added to the call setup message as it is, so that the calling process (the process for sending the call setup message) becomes easy. .

Alternatively, the line number information may be only the line number. In this case, the line connection management device 1 of the called user writes only the line number into the communication waiting buffer 6, and can store a large amount of line number information even if the communication waiting buffer 6 has a small storage capacity. .

Next, an example of the structure of the communication waiting buffer 6 will be described. As shown in FIG. 8, the communication waiting buffer 6
Is a continuous n (arbitrary number) line number information storage block (storage area) B ₀ , B ₁ , B ₂ , ... B _n-1 for storing the line number information sent from the calling user. When,
A storage number register R1 indicating how many line number information is stored in the communication waiting buffer 6 and a head block indicating which block is the head block (block storing the line number information with the highest priority) Number register R
2 and.

The line number information storage block B ₀ ,
The storage capacity of B ₁ , B ₂ , ... B _n-1 must be greater than or equal to the maximum bit length of the line number information. For example, when the line number information of the same format as the "Called number" information element (maximum length 35 bytes) of the layer 3 protocol of the INS net service is stored, each line number information storage block contains 35 lines.
It can be a block of bytes.

Then, with respect to the above-mentioned n pieces of line number information storage blocks B ₀ , B ₁ , B ₂ , ... B _n-1 , from 0 to (n-) so that each block can be uniquely identified. 1)
The identification numbers up to the number are assigned to each block.

The communication waiting buffer 6 is initialized by the priority management unit 5 writing "0" in both the saved number register R1 and the head block number register R2.

In the above configuration, in the line connection management device 1 of the called user, when the packet switching control unit 4 receives the line number information from the calling user, the priority order management unit 5 sets (saved number register value + leading block). Number register value) <
It is determined whether or not the condition of n above is satisfied, and if the condition of the above formula is satisfied, the line number received in the (number of saved register value + head block number register value) line number information storage block. While writing the information, if the above condition is not satisfied, write the received line number information to the (save number register value + start block number register value-n) th line number information storage block, and then save number register Rewrite the value to (current saved count register value + 1).

When the priority management unit 5 reads the line number information from the communication waiting buffer 6, the line number information is stored from the line number information storage block corresponding to the register value number stored in the head block number register R2. read out. Further, when the line number information is read out as described above, the priority order management unit 5 sets 0 if the current start block number register value is (n-1), and otherwise (current start block number register The value +1) is written to the head block number register R2.

As a result, the line number information stored in the communication waiting buffer 6 is sequentially read from the line number information written earlier (that is, received earlier).

In the above case, the line number information exceeding n cannot be stored in the communication waiting buffer 6,
It is desirable to make the number of line number information storage blocks as large as possible. If there is a possibility that the saved number register value exceeds n, the above-mentioned structure is linked to avoid the situation where the received line number information cannot be saved.

As described above, the line connection management device 1 of this embodiment has the ISDN 7 capable of both the line switching type communication and the packet switching type communication, and the plurality of ISDN terminals connected to the ISDN 7. It is used in a network communication system, and is provided in each ISDN terminal that intends to perform information communication via the above ISDN 7, and despite making a call for circuit connection by circuit switching. When the line connection cannot be established, the packet switching control unit 4 which transmits its own line number information to the connection destination by the packet switching type communication using the D channel,
A communication waiting buffer 6 for sequentially storing line number information received by packet switching communication, and the communication waiting buffer 6
Based on the line number information stored in the communication waiting buffer 6 when the line connection by the line switching becomes possible and the priority management unit 5 for managing the priority of the line number information stored in And a circuit switching control unit 3 that sequentially performs call control for circuit connection by circuit switching in the order of high priority.

As a result, an ISDN terminal (calling user) equipped with the line connection management apparatus 1 is another ISDN terminal (callee user) also equipped with the line connection management apparatus 1.
When a line connection is made by line switching with respect to the line connection information, when the line connection fails, the line connection management device 1 automatically transmits the line number information by D channel packet switching to the called user. It is possible to connect the line by circuit switching just by waiting for the line connection from the called user side, and it is not necessary to repeat redialing (recalling) until the line connection is successful, unlike the conventional case. Therefore, the burden on the calling user side is significantly reduced as compared with the conventional case. Also, the load on call control between the calling user and the network can be reduced.

The line connection management device 1 on the called user side
When the line connection by circuit switching is not possible,
When line number information is received from multiple calling users by D-channel packet switching, each received line number information is given a priority and saved, and when the line connection by circuit switching becomes possible, according to the priority order. Since the line connection is made to each calling user sequentially by circuit switching, each calling user can surely make a line connection to the called user by circuit switching. It does not take time more than the above, and it is possible to avoid the situation that the line connection cannot be established forever. Further, even if there are a large number of calling users who cannot connect to the line by circuit switching, the large number of calling users repeatedly redial (recall) until the line connection is successful as described above.
Since it is not necessary to do so, it is possible to avoid the situation where the input traffic to the network unnecessarily increases.

[Second Embodiment] The following will describe another embodiment of the present invention with reference to FIGS. 9 to 11. For convenience of explanation, members having the same configurations and functions as those shown in the drawings of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

When the line connection management device 1 of the first embodiment becomes the calling user, it sends its own line number information to the connection destination by packet switching type communication using the D channel, while becoming the called user. In this case, the line number information sent from the calling side is stored in the communication waiting buffer 6, and when the line connection by the line exchange becomes possible, the line connection by the line exchange is performed based on the line number information. Thus, it has both the calling side function and the called side function. That is, the ISDN terminal provided with the line connection management device 1 can be a calling user or a called user in the line connection management system.

Considering an example of a ticket sales system for concerts using ISDN terminals, the ISDN terminal on the ticket sales side is always the receiving user, and the ISDN terminal on the ticket purchasing applicant side is always the calling user. . As described above, in the case of a network communication system in which an ISDN terminal is a called user only and an ISDN terminal is a calling user only, as shown in FIG. Incoming leased line connection management device 21 (first
A line connection management device) is provided, and the IS of the calling user side
The DN terminal 10 may be provided with the outgoing call dedicated line connection management device 11 (second line connection management device) having only the calling side function.

In the line connection management system of this embodiment, the above-mentioned incoming call dedicated line connection management device 21 provided in the ISDN terminal 20 on the incoming side and the ISDN terminal 10 on the outgoing side.
It is comprised of the above-mentioned outgoing call dedicated line connection management device 11 provided in.

As shown in FIG. 10, the outgoing call dedicated line connection management device 11 omits the priority order management unit 5 and the communication waiting buffer 6 included in the line connection management device 1 of FIG. In this configuration, a circuit switching control unit 13 (circuit switching control means) is provided instead of the circuit switching control unit 3 included in. The circuit switching control unit 13 does not have a function of performing call control based on the circuit number information stored when the circuit connection becomes possible by circuit switching, except for the circuit connection management device 1. It has the same function as the circuit switching control unit 3.

As shown in FIG. 11, the incoming call dedicated line connection management device 21 has a packet switching control unit 2 instead of the packet switching control unit 4 included in the line connection management device 1 of FIG.
4 is a configuration having 4. The packet switching control unit 24
The (packet switching control means) has the same function as the packet switching control unit 4 of the line connection management device 1 except that it does not have the function of transmitting its own line number information when the line connection by circuit switching fails. .

The outgoing call leased line connection management device 11 and the incoming call leased line connection management device 21 have a simpler structure and lower cost than the line connection management device 1 of the first embodiment. In particular, the outgoing leased line connection management device 11
Since the priority management unit 5 and the communication waiting buffer 6 can be omitted, the cost can be significantly reduced as compared with the line connection management device 1 of the first embodiment. Therefore, as shown in FIG. 9, it is possible to construct a low-cost line connection management system even when there are many ISDN terminals 10 on the outgoing side with respect to ISDN terminals 20 on the incoming side.

The line connection management system is, for example, IS
It can be applied to a membership ticket sales system using a DN terminal.

The line connection management device and the line connection management system can be applied to any information communication network capable of both line switching type communication and packet switching type communication, and are limited to ISDN. is not. The above-mentioned embodiments are merely for clarifying the technical contents of the present invention, and should not be construed in a narrow sense by limiting to such specific examples. Various modifications can be made within the range.

[0074]

According to the line connection management device of the invention of claim 1,
As described above, when the communication network terminal device makes a call for line connection by circuit switching but cannot establish the line connection, the line number information of the communication network terminal device is obtained by packet switching communication. To a connection destination, storage means for sequentially storing line number information received by packet switching communication, and priority management for managing the priority order of the line number information stored in the storage means. When the line connection by means of line switching becomes possible, the call control for line connection by line switching is performed in the order of higher priority based on the line number information managed by the priority management unit. The circuit switching control means is arranged to perform sequentially.

Therefore, in contrast to a communication network terminal device having a line connection management device (hereinafter referred to as a calling user), another communication network terminal device having the line connection management device (hereinafter referred to as a called user) is also used. When line connection is performed by line switching, the calling user does not have to repeat redialing (recalling) until the line connection succeeds, as in the past, even if the line connection by circuit switching fails. It is possible to connect the line by switching the line just by waiting for the line connection from, and the burden on the calling user side can be greatly reduced compared to the conventional method. In addition, since the line connection management device on the called user side manages the line number information received from the calling user by prioritizing and managing the line number information, the line connection with the called user succeeds after the calling user fails to connect the line. By doing so, it is possible to reliably connect the line between the calling user and the called user without requiring an unnecessarily long time, and it is possible to avoid a situation in which the line connection cannot be established forever. Furthermore, even if there are a large number of outgoing users who cannot make a line connection by circuit switching because a large number of outgoing users flood into a certain called user, these large number of outgoing users will not be able to access the line as described above. You don't have to redial repeatedly until the connection is successful,
It is possible to avoid the situation where the input traffic to the information communication network unnecessarily increases.

As described above, the line connection management system according to the invention of claim 2 is provided with the first line connection management device provided in the communication network terminal device on the receiving side and the first line connection management device. A second line connection management device provided in the communication network terminal device for making a call to the communication network terminal device, wherein the second line connection management device is a communication network in which the second line connection management device is provided. A packet for transmitting the line number information of the communication network terminal device to the connection destination by packet switching communication when the line connection cannot be established even though the terminal device originates a call for line connection by circuit switching. The first line connection management device is provided with a switching control means, and the first line connection management device stores the line number information received from the second line connection management device by packet switching communication in order, and the storage device. The priority management means for managing the priority order of the line number information and the line priority information based on the line number information managed by the above priority management means when the line connection by the circuit exchange becomes possible. The circuit switching control means sequentially performs call control for circuit connection by circuit switching in the descending order.

Therefore, the same effect as that of the invention of claim 1 is obtained, and a certain communication network terminal device is only a called user, such as a ticket sales system for concerts, and a certain communication network terminal device is When the line connection management system of the present invention is applied to a network communication system in which only the calling user is used, the first line connection management device and the second line connection which are simpler in structure than the line connection management device of claim 1. The management device can be used, and an effect that an inexpensive line connection management system can be constructed is also obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention and showing a configuration of a main part of a line connection management device.

FIG. 2 is a schematic explanatory view showing that a network communication system is configured by providing the line connection management device in a digital telephone.

FIG. 3 is a schematic explanatory diagram showing that a network communication system is configured by providing the line connection management device in a facsimile device.

FIG. 4 is a schematic explanatory view showing that a network communication system is configured by providing the line connection management device in a personal computer terminal.

FIG. 5 is an explanatory diagram showing a basic call control sequence for circuit connection by circuit switching in ISDN.

FIG. 6 is an explanatory diagram showing an example of a call control sequence in the case where line connection by circuit switching in ISDN is not successful.

FIG. 7 is a flowchart showing an operation of the line connection management device when the line connection by the line exchange is not successful.

FIG. 8 is an explanatory diagram showing an example of a structure of a communication waiting buffer of the line connection management device.

FIG. 9 is a block diagram showing another embodiment of the present invention and showing a schematic configuration of a network communication system to which a line connection management system is applied.

FIG. 10 is a block diagram showing a configuration of a main part of an outgoing call dedicated line connection management device in the line connection management system.

FIG. 11 is a block diagram showing a configuration of a main part of an incoming call dedicated line connection management device in the line connection management system.

[Explanation of symbols]

1 line connection management device 2 line interface 3 circuit switching control unit (circuit switching control means) 4 packet switching control unit (packet switching control means) 5 priority management unit (priority management means) 6 communication waiting buffer (storage means) 7 ISDN (Information and communication network) 10 ISDN terminal (communication network terminal device) 11 Call-dedicated line connection management device (second line connection management device) 13 Circuit switching control unit (circuit switching control means) 20 ISDN terminal (communication network terminal device) 21 incoming call dedicated line connection management device (first line connection management device) 24 packet switching control unit (packet switching control means)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04L 12/56 H04M 3/00 B 9466-5K H04L 11/20 102 Z

Claims (2)

[Claims] 1. A network communication system having an information communication network capable of both circuit-switched communication and packet-switched communication and a plurality of communication network terminal devices connected to the information communication network. A line connection management device provided in each communication network terminal device that intends to perform information communication via the information communication network, wherein the communication network terminal device makes a call for line connection by circuit switching. If the line connection cannot be established despite the fact, the packet switching control means for transmitting the line number information of the communication network terminal device to the connection destination by the packet switching type communication and the line number information received by the packet switching type communication are provided. Storage means for sequentially storing, priority management means for managing the priority of the line number information stored in the storage means, and line connection by circuit switching are possible. And a circuit switching control means for sequentially performing call control for circuit connection by circuit switching in the order of high priority based on the circuit number information managed by the priority management means. A line connection management device characterized in that 2. An information communication network capable of performing both circuit-switched communication and packet-switched communication, and a plurality of communication network terminal devices connected to the information communication network, and via the information communication network. And a first line connection management device provided in the communication network terminal device on the receiving side, and the first line connection management device. And a second line connection management device provided in the communication network terminal device for making a call to the communication network terminal device, wherein the second line connection management device is the second line connection management device. When the communication network terminal device provided with the management device makes a call for line connection by circuit switching but cannot connect the line, the line of the communication network terminal device is made by packet switching communication. Packet switching control means for transmitting the number information to the connection destination, and the first line connection management device stores the line number information sequentially received from the second line connection management device by packet switching communication. , The priority management means for managing the priority order of the line number information stored in the storage means, and the line number information managed by the priority management means when the line connection by the line exchange becomes possible. On the basis of the above, the line connection management system is provided with a line switching control means for sequentially performing call control for line connection by circuit switching in order of high priority.