JPH09116641A - Line connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently execute line connection to another communication opposite party even with a fault in the communication opposite party by abandoning a connection request as the cause of a call originating processing when it is judged that the call originating processing is not executed again. SOLUTION: A request receiving means 2 stores the plural connection requests 31, 32 and 33 from a communication equipment in a connection request receiving queue 2a. Then, the requests are taken out one by one in prescribed order, a call originating control means 3 executes the call originating processing to another communication equipment based on these requests and an information transmission path is established on the communication line when another communication equipment is a communication enabling state. Unless another communication equipment is the communication enabling state by the result of the call originating processing in the control means 3, a judging means 4 judges whether or not the call originating processing is executed again in accordance with the state. When the judging means 4 judges that the call originating processing is not executed again, the connection request which is the base of the call originating processing is abandoned by a request processing means 5. When it judges that the call originating processing is executed again, the connection requests 31-33 are stored at the last of the queue 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line connection device which establishes an information transmission line required for the communication on the communication line in order to perform communication between the communication devices connected to each other via the communication line. It is about.

[0002]

2. Description of the Related Art Conventionally, as a line connection device, for example, N
CU (Network Control Unit) and modem (Modulator-De
Like a modulator), by connecting to or mounting on a communication device such as a personal computer (hereinafter referred to as a personal computer), a public line or a PBX (PBX) is connected between this communication device and its communication partner (for example, another personal computer). privat
It is known that data communication can be performed using a communication line such as ebranch exchange). In such a line connection device, when there is a request (connection request) for performing data communication with a plurality of communication partners in the communication device, an information transmission path is established on the communication line, that is, the communication device and the communication partner are connected. The so-called line connection between the two is performed as follows.

For example, when a connection request is made to a plurality of communication partners, the line connection device temporarily stores these connection requests in the processing queue, and each communication partner according to the order stored in the processing queue. Perform the call processing for. That is, after the line connection with the one communication partner is completed by the call processing for one communication partner, the call connection process for the next communication partner is started to establish the line connection with each communication partner. . However, when it is determined that the line connection with the communication partner cannot be established, this line connection device performs the call processing for the communication partner again (retries) after a certain period of time.

Further, for example, in Japanese Patent Laid-Open No. 3-123170, a time zone in which call processing can be performed for each communication partner, that is, an access time zone is set in advance, and call processing for each communication partner is performed. A method of scheduling so as not to overlap is disclosed. In the line connection device using this method, when there is a connection request with a plurality of communication partners, the call processing for each communication partner is performed in accordance with a preset access time zone, and the communication with each communication partner is performed. It is designed to connect to the line.

[0005]

Generally, in a line connection device, a communication partner has, for example, a device failure, a line defect on the communication line, and a capacity shortage (system resource shortage) on the communication partner side with respect to the amount of data to be transmitted. If a failure such as the above occurs, the line connection cannot be completed even if the calling process is performed. Further, these failures require a lot of time to recover from the failure, unlike the case where the communication partner can complete the line connection by retrying such as when the communication partner is communicating with another communication partner (the line is being used). When a failure that requires a lot of time for such recovery occurs, the line connection device that stores the connection request described above in the processing queue repeatedly retries the failed communication partner.
Therefore, the call processing to the other communication partner is kept waiting while the retry is repeated, and as a result, the line connection to the other communication partner cannot be efficiently performed.

Further, in the line connection device using the method disclosed in Japanese Patent Laid-Open No. 3-123170, when the above-mentioned trouble occurs in this communication partner during the access time zone for the communication partner, the access time is set. During the band, it becomes impossible to connect to the communication partner and the other communication partner. That is, no line connection can be established with any communication partner during the access time period,
As a result, the line connection to the other communication partner cannot be performed efficiently. Furthermore, in this line connection device, it is necessary to set access time zones in advance for all communication partners, and when performing data communication with a large number of communication partners, set access time zones for each communication partner. However, it is not practically preferable in consideration of recovery and the like when a failure occurs.

Therefore, an object of the present invention is to provide a line connection device capable of efficiently performing line connection to another communication partner even when a failure occurs in one communication partner.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a line connection device devised to achieve the above-mentioned object, wherein one communication device is connected to another communication device connected to each other via a communication line. When there is a connection request for performing communication with the communication device, an information transmission path required for the communication is established on the communication line based on the connection request, and further, there are a plurality of connection requests. If there is, the request receiving means for receiving and storing these connection requests and the connection requests stored in the request receiving means are taken out one by one in a predetermined order, and based on the taken out connection requests, to the other communication device. If a call processing is performed and the other communication device is in a communicable state, a call control means for establishing the information transmission path on the communication line, and a result of the call processing by the call control means, Other communication device can communicate If not state, determination means for determining whether or not re-perform the call processing in accordance with the state,
If this judging means judges that the calling process is not performed again,
Request processing means for discarding the connection request that is the basis of the calling process.

According to the line connection device having the above configuration, when a plurality of connection requests are stored in the request receiving means, the call control means sends these connection requests one by one from the request receiving means in a predetermined order. The call is taken out and the calling process is performed to another communication device based on the connection request. Then, if the other communication device is in a communicable state, an information transmission path is established on the communication line between the communication device that is the connection request source and the other communication device. However, the call control means cannot establish the information transmission path unless another communication device can communicate. At this time, the determination means determines whether or not to perform the calling process for the other communication device again according to the state of the other communication device. If the determination means determines that the call processing is not performed again due to a failure such as a failure in another communication device, the request processing means discards the connection request that is the basis of the call processing. When the request processing means discards the connection request, the call control means extracts a new connection request from the request accepting means and performs the call processing according to the connection request. Therefore, in this line connection device, even if a failure occurs in one communication device, the connection request for this communication device is discarded by the request processing means.
This calling process to the communication device is not repeated many times, and the process of requesting connection to another communication device is not kept waiting.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A line connection device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a functional configuration of a line connection device 1 according to the present invention, and FIG. 2 is a block diagram showing a system configuration in which the line connection device 1 is used. As shown in FIG. 2, the line connection device 1 according to the present embodiment includes a communication line 10, a plurality of terminal devices 21, 22, 23 ... And a communication device 30 provided with the line connection device 1. It is used in the system configuration. Note that the communication device 30 and the terminal device 2 have such a system configuration.
Data communication is performed between the terminals 1, 22, 23, ....

The communication line 10 is composed of a public line, a PBX, etc., and comprises the terminal devices 21, 22, 23 ... And the communication device 3.
0 and 0 are connected to each other. An information transmission line for performing data communication is established on the communication line 10 by the line connection device 1 as described later. Each of the terminal devices 21, 22, 23 ... Functions as another communication device in the present invention,
It is a communication partner of the communication device 30 when performing data communication. In the terminal devices 21, 22, 23, ... When the line connection device 1 performs a calling process described later, the state of the terminal devices 21, 22, 23, ... At that time, that is, whether data communication is possible or not By notifying the line connection device 1 of a signal indicating that, the call connection process is responded to.

The communication device 30 is composed of a personal computer, a general-purpose computer (host computer), or the like. When an information transmission path is established on the communication line 10, the terminal device 21, 22, using the information transmission path, Two
Data communication is carried out with 3 ... However, in the communication device 30, in order to perform data communication with the terminal devices 21, 22, 23 ..., The connection request 31, 32, 33 ... For establishing an information transmission path on the communication line 10 is sent to the line connection device 1. It is supposed to be given to. The connection requests 31, 32, 33, ...
23, and each of them is generated asynchronously by the communication device 30. Further, the communication device 30 is provided with a timer 30a including a clock circuit and the like, and a line connection device 1 including an NCU and a modem. However, the line connection device 1
Even if it is provided inside the communication device 30,
It may be formed so as to be connected to an external connector of the communication device 30.

The line connection device 1 used in the system configuration as described above receives a connection request 3 from the communication device 30.
When 1, 32, 33 ... Are given, these connection requests 3
An information transmission line is established on the communication line 10 based on 1, 32, 33, ... Further, the line connection device 1 has these connection requests 31, 32, 33 ...
RAM (Random
Connection request acceptance queue 2 consisting of access memory)
a and a connection failure request reception queue 6a are provided.

However, the line connection device 1 is configured to perform line connection for these connection requests 31, 32, 33 ... With the functional configuration shown in FIG. That is, the line connection device 1 is provided with the functions of the request reception means 2, the call control means 3, the determination means 4, the request processing means 5, the request saving means 6, and the request transfer means 7. is there. Each of these means is formed by executing a program in the line connection device 1.

Upon receiving a plurality of connection requests 31, 32, 33, ... From the communication device 30, the request receiving means 2 stores these connection requests 31, 32, 33, ... In the connection request reception queue 2a in a FIFO (First-In First). -Out) method. In the connection request reception queue 2a, these connection requests 31, 32, 33, ... Are stored in the configuration shown in FIG. That is, the connection request reception queue 2a has a queue top (QUEUE TOP)
34 and the connection requests 31, 32, 33, ... Are stored in a predetermined order linked to each other.

QUEUE TOP 34 is the first connection request 3 in the processing queue of the connection request reception queue 2a.
1 indicates an address where 1 is stored. Connection request 3
1 is data (DATA) 31a and front link (FRON
T LINK) 31b and NEXT LINK 31
connection request reception queue 2a having a configuration including c
It is stored in. Note that this configuration is the same for the other connection requests 32, 33 ...

The DATA 31a is information indicating the line number (pointer) to which the terminal device 21 designated by the connection request 31, that is, the terminal device 21 that is a communication partner is connected. The FRONT LINK 31b is information indicating the contents such as the priority of the connection request 31. The NEXT LINK 31c is information indicating which connection request 32 the connection request 31 is linked to next. With such a configuration, the connection requests 31, 3
By storing 2, 33, ..., The connection request reception queue 2a functions as a FIFO processing queue.

Further, in FIG. 1, the call control means 3 has a connection request 31 stored in the connection request acceptance queue 2a.
32, 33 ... Are taken out one by one from the head of the processing queue, and the communication partners designated by the taken out connection requests 31, 32, 33.
The call processing to 2, 23 ... Is performed. Then, based on the response from the terminal device 21, 22, 23 ... To this call processing, if the terminal device 21, 22, 23 ... Is in a data communicable state, the terminal device 21, 22, 23 ...
And a communication device 30 are connected. The call control means 3 discards the connection request 31, 32, 33, ... Which is the basis of the completion of the line connection.

Further, in the call control means 3, when the connection requests 31, 32, 33 ... Are picked up from the connection request acceptance queue 2a, the same connection requests 31, 32, 33 ... It is configured to determine whether or not 33 ... Are held in the request saving means 6, which will be described later, that is, the connection failure request reception queue 6a. And
The calling process is performed only when the same connection request 31, 32, 33 ... Is not held, and the same connection request 31, 3,
When 2, 3, ... Are held, the calling process is not performed, and the extracted connection requests 31, 32, 33, ... Are newly held in the connection failure request acceptance queue 6a.

As a result of the calling processing in the calling control means 3, the judging means 4 completes the line connection by the calling control means 3 if the terminal devices 21, 22, 23 ... Are not in a data communicable state. In that case, it is determined whether or not to perform the calling process again. The determining means 4 determines whether or not to perform the calling process again, based on the response from the terminal devices 21, 22, 23 ... To the calling process. For example, if the line is being used or the call-out time-out does not respond to the calling of the call-out process, the line connection can be completed by retrying, so it is determined that the call-out process is to be performed again. In addition, the terminal devices 21, 22, 23 ...
Error due to bad line above, terminal devices 21, 22, 23
If a failure such as system resource shortage occurs, it takes a long time to recover, so it is determined that the call processing is not performed again.

If the request processing means 5 judges that the calling processing is to be executed again, the request processing means 5 processes the connection requests 31, 32, 33, ... It is stored at the end of the queue,
Further, if the judging means 4 judges that the calling process is not performed,
The connection request 31, 32, 33 ...
Is stored in the request saving means 6 described later. In the request processing means 5, when the judging means 4 judges that the calling process is to be performed again, the communication device determines the time interval (retry interval) until the next calling process for the connection request 31, 32, 33. The timer 30a of 30 is set.

The request saving means 6 receives the connection requests 31, 32, 33 ... From the request processing means 5, that is, the connection requests 31, 32, 33 which the judging means 4 judges not to perform the calling process.
Is received and held in the unconnectable request reception queue 6a. The connection request reception queue 6a holds the connection requests 31, 32, 33 ... In the same configuration as the connection request reception queue 2a.

The request transfer means 7 cannot connect when all the connection requests 31, 32, 33, ... Stored in the connection request acceptance queue 2a are taken out by the call control means 3 and disappear from the connection request acceptance queue 2a. The connection requests 31, 32 held in the request reception queue 6a,
33 are transferred to the connection request acceptance queue 2a. In the request transfer means 7, the NEXT LIN stored at the end of the processing queue of the connection request reception queue 2a
K and the QU stored in the connection failure request reception queue 6a
By linking with EUE TOP, transfer between these is performed. That is, the transfer of the connection requests 31, 32, 33, ...
In the call control means 3, when the connection requests 31, 32, 33, ... Stored in the connection request reception queue 2a disappear from the connection request reception queue 2a, the connection requests held in the connection failure request reception queue 6a. 31, 3
The calling process is performed based on 2, 33 ...

Next, in the line connection device 1 configured as described above, the information transmission path is established on the communication line 10, that is, the communication device 30 and the terminal devices 21, 22, 23.
An example of the operation of connecting a line with the line will be described with reference to the flowchart of FIG. However, in the drawing, the connection request reception queue 2a is simply referred to as a queue, and the connection failure request reception queue 6a is simply referred to as a failure queue.

In this line connection device 1, when the device is started up by turning on the power supply or the like, the request reception means 2 initializes the connection request reception queue 2a, that is, clears the memory (step 101; (Omitted).
After that, when receiving the connection requests 31, 32, 33, ... From the communication device 30, the request receiving unit 2 stores these in the connection request receiving queue 2a (S102). here,
The calling control means 3 refers to the QUEUETOP 34 stored in the connection request reception queue 2a and extracts the connection request 31 stored at the head of the processing queue of the connection request reception queue 2a (S103). At this time, the call control means 3 determines whether or not there is a connection request 31 to be taken out in the connection request reception queue 2a (S10).
4) If there is a connection request 31 to be taken out, the connection request 31 is taken out.

The connection request reception queue 2 for the connection request 31
Then, the call control means 3 searches the connection prohibition request reception queue 6a (S105), and the same connection request 31 as the extracted connection request 31 is held in the connection prohibition request reception queue 6a. It is determined whether or not there is (S106). If the same connection request 31a is held in the unconnectable request reception queue 6a, the call control means 3 does not perform the calling process according to the extracted connection request 31 and the connection request 31 is received as the unconnectable request reception queue. 6a is held at the end of the processing queue (S10).
7). On the other hand, if the same connection request 31 is not held in the connection prohibition request reception queue 6a, the call control means 3
Performs the calling process according to the extracted connection request 31 (S
108).

When the calling control means 3 performs the calling process, the judging means 4 establishes a line connection between the terminal device 21 and the communication device 30 based on the response from the terminal device 21 to the calling process. It is determined whether or not is completed (S109). When the determination unit 4 determines that the line connection is completed, the call control unit 3 discards the extracted connection request 31 (S110), and newly sets the start request in the processing queue of the connection request reception queue 2a. Connection request 32
The steps described above are repeated from the step of extracting (S103).

When the line connection is not completed due to the line being used in the terminal device 21 or the call timeout, the judging means 4 judges that the call processing for which the line connection is not completed is performed again. When the determination means 4 determines that the call processing is to be performed again, the request processing means 5 sets the retry interval for the connection request 31 which is the basis of the call processing in the timer 30a (S111), and at the same time, the connection request. 31 is stored again at the end of the processing queue of the connection request reception queue 2a (S112). Connection request 3
When 1 is stored in the connection request acceptance queue 2a, the calling control means 3 extracts the newly headed connection request 32 in the processing queue of the connection request acceptance queue 2a from the step (S103) to the steps described above. repeat.

Further, for example, the terminal devices 21, 22, 23 ...
If the line connection is not completed due to a failure such as a failure in the communication line, an error due to a line failure on the communication line 10, a shortage of system resources of the terminal devices 21, 22, 23, ... It is determined that the process will not be performed again.
When the determination unit 4 determines that the call processing is not performed again, the request processing unit 5 does not store the connection request 31 that is the basis of the call processing in the connection request reception queue 2a (S
113), and hold it in the connection prohibition request reception queue 6a (S114). When the connection request 31 is held in the unconnectable request acceptance queue 6a, the calling control means 3 takes out the connection request 32 which is the new head in the processing queue of the connection request acceptance queue 2a (S10).
The above steps are repeated from 3).

However, in the step (S104) in which the call control means 3 retrieves the connection requests 31, 32, 33 ... From the connection request acceptance queue 2a, the retrieved connection requests 31, 32, 33. If it is determined that a retry is to be performed and the set retry interval has not elapsed, that is, the timeout has not occurred, the call control means 3 determines that the connection request 31, 32, 33, ... Are stored again at the end of the processing queue of the connection request reception queue 2a (S11).
2). Then, in the processing queue of the connection request reception queue 2a, the connection requests 31 and 3 newly added to the head.
The steps described above are repeated from the step (S103) of taking out 2, 33 ...

Further, in the step (S104) in which the call control means 3 retrieves the connection requests 31, 32, 33 ... From the connection request reception queue 2a, the connection requests 31, 32 stored in the connection request reception queue 2a, 33 ...
If there is not, the request transfer means 7 determines whether or not the connection request 31, 32, 33, ... Is held in the connection prohibition request reception queue 6a (S115). Then, the connection request 31, 32, 33 ...
If is held, the request transfer means 7 transfers the QUEUE TOP held in the connection failure request reception queue 6a to the connection request reception queue 2a. That is, all connection requests 31, 32, 33, ... Held in the connection failure request reception queue 6a are stored in the connection request reception queue 2a in the order in which they are held (S115).

The request transfer means 7 makes the connection requests 31, 32, 3
.. are transferred to the connection request acceptance queue 2a, the call control means 3 extracts the connection requests 31, 32, 33 ... From the connection request acceptance queue 2a again (S10).
The above steps are repeated from 3). Thus, in the line connection device 1, the connection request 31 from the communication device 30,
32, 33 ... For the communication device 30 and the terminal device 21,
Lines are connected to 22, 23 ...

As described above, in the line connection device 1 according to the present embodiment, even if the line connection cannot be established due to a failure such as a failure in the terminal device 21, 22, 23, ... The connection request, which is the basis of the calling process, is saved in the connection disable request reception queue 6a. Therefore, in this line connection device 1, even if a failure that takes time to recover occurs in a certain terminal device 21,
Since the calling process for the terminal device 21 is not repeated many times, the processing of the connection request for the other terminal devices 22, 23 ... Is not kept waiting, and as a result, the other terminal devices 22, 23. Can be efficiently connected to the line. Further, in this line connection device, since it is not necessary to set the access time zone for the terminal devices 21, 22, 23 ... In advance, it is possible to perform data communication with many terminal devices 21, 22, 23. Even if there is, it is possible to eliminate practically difficult factors such as the setting of the access time zone.

In the line connection device 1 according to the present embodiment, the request saving means 6 holds the connection request saved by the request processing means 5 in the unconnectable request accepting queue 6a and the connection request accepting queue 2a. When there is no connection request from among the above, the request transfer means 7 transfers the connection request held in the connection failure request reception queue 6a to the connection request reception queue 2a. Therefore, the line connection device 1 can process the connection request that could not be connected to the line again without waiting for the processing of other connection requests. This makes it unnecessary for the line connection device 1 to newly provide a connection request that could not be made by the line connection, which is convenient for the user (user) and makes the connection request available for other connection. Since the request can be processed without waiting, the line connection can be efficiently performed.

Further, in the line connection device 1 according to the present embodiment, when the call origination process is performed, the call origination control means 3 issues the same connection request as the connection request on which the call origination process is based on the connection unavailability request. It is determined whether or not the call is held in the reception queue 6a, and if the same connection request is held, the calling process is not performed. Therefore, in this line connection device 1, even if there is a connection request to the terminal device 21 in which a failure, which takes time to recover, occurs, for example, the call processing for that terminal device 21 is not newly performed. The processing of the connection request to the devices 22, 23 ... Is not kept waiting, and as a result, the line connection to the other terminal devices 22, 23 ... Can be performed more efficiently.

In the present embodiment, the line connection device 1 for connecting lines when one communication device 30 performs data communication with a plurality of terminal devices 21, 22, 23 ... Will be described as an example. However, the present invention is not limited to this. For example, it is also applicable to a line switching device provided on the communication line 10 in which line connection is randomly made between a plurality of communication devices. Also,
In the present embodiment, a case has been described as an example where a personal computer or the like performs data communication, but the present invention can be applied even when a facsimile apparatus communicates image information.

Further, although the case where the connection request reception queue 2a and the connection failure request reception queue 6a store the connection requests 31, 32, 33, ... In the FIFO method has been described in the present embodiment, the present invention is not limited to this. It is not limited. For example, when an urgent connection request is generated, the connection request is stored at the head of the connection request reception queue 2a, so that the processing of the connection request has priority over the processing of other connection requests. It is also possible to do so. In this case, for example, when storing the connection request in the connection request reception queue 2a, the FRON of the connection request
Information indicating that may be stored in T LINK.

Further, in the present embodiment, the request transfer means 7
Has described the case of transferring the connection requests 31, 32, 33 ... Held in the connection failure request reception queue 6a to the connection request reception queue 2a, but the present invention is not limited to this. For example, if there is no connection request stored in the connection request reception queue 2a, and if the call control means 3 has a function of subsequently extracting the connection request held in the connection failure request reception queue 6a, the request is made. The transfer means 7 may not be provided. Further, the connection requests 31, 32, 33, ... Stored in the connection request reception queue 2a and the connection failure request reception queue 6a.
A signal such as a flag is added to each of the queues, and the call origination control unit 3 sends a connection request 31, 32, 3 from which queue according to the flag.
The request transfer means 7 may not be provided as long as it has a function of determining whether to take out 3 ...

[0039]

As described above, the line connection device of the present invention is required even if the information transmission line cannot be established on the communication line due to the occurrence of a failure such as a failure in a communication device. The processing means discards the connection request that is the basis of the calling process. Therefore, in this line connection device, even if a failure that takes time to recover occurs in a certain communication device, the call processing for that communication device is not repeated many times. There is no need to wait for processing, and as a result, line connection to other communication devices can be efficiently performed. Further, in this line connection device, since it is not necessary to set the access time zone and the like in advance for other communication devices, even when performing data communication with many communication devices, the access time zone is set. It is possible to eliminate practically difficult factors such as.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a functional configuration of an example of an embodiment of a line connection device according to the present invention.

FIG. 2 is a block diagram showing a system configuration in which the line connection device of FIG. 1 is used.

FIG. 3 is an explanatory diagram showing configurations of connection requests stored in a connection request reception queue and a connection failure request reception queue.

4 is a flowchart showing an example of line connection operation in the line connection device of FIG.

[Explanation of symbols]

 1 line connection device 2 request acceptance means 3 call control means 4 judgment means 5 request processing means 6 request saving means 7 request transfer means 10 communication lines 21, 22, 23 terminal device 30 communication device 31, 32, 33 connection request

Claims (3)

[Claims] 1. When there is a connection request for communication from one communication device to another communication device between communication devices connected to each other via a communication line, the communication is based on the connection request. A line connection device that establishes an information transmission path required for the communication line on the communication line, and if there are a plurality of connection requests, request reception means for receiving and storing these connection requests, and a request reception means for storing the connection requests. The connection requests are taken out one by one in a predetermined order, and the calling process for the other communication device is performed based on the extracted connection request. If the other communication device is in a communicable state, the connection is made on the communication line. If the call control means for establishing the information transmission path and the call processing in the call control means are not in a communicable state with the other communication device, the call processing is performed according to the state. Determination means for determining whether or not to carry out again, When it is judged that the disconnection means does not perform again the outgoing call processing, line connection apparatus characterized by comprising a discarding request processing unit a connection request that sourced the emitting call processing. 2. A request saving means for holding a connection request discarded by the request processing means, and the call control means is provided with all connection requests stored in the request accepting means. 2. The line connection device according to claim 1, further comprising a function of performing a calling process on the basis of the connection request held in the request saving unit when the request is removed from the reception unit. 3. When the call origination control means performs a call origination process based on the connection request extracted from the request acceptance means, whether the same connection request as the connection request is held in the request saving means. 3. The line connection device according to claim 2, wherein it is judged whether or not there is a call, and if the call is held, the calling process is not performed.