JPH07221726A - Multiplex communication system - Google Patents

Abstract

PURPOSE:To obtain the multiplex communication system in which misconnection is prevented by providing an own station/other station discrimination means that discriminates whether a caller terminal equipment and a destination terminal equipment are connected to a slave station of a concerned station or a slave station of other station to a master station. CONSTITUTION:When an in-station connection discrimination means 32 of a master station 31 discriminates it that a caller terminal equipment A and a destination terminal equipment B are connected to a same slave station 2 respectively, an own station/other station discrimination means 33 sends own station/ other station discrimination information allocated to the master station 31 to a host device. Furthermore, the own station/other station discrimination means 33 discriminates whether or not the own station/other station discrimination information received from the host device is the own station/other station discrimination information sent from a concerned station, and only when it is discriminated that the information is the own station/other station discrimination information sent from the concerned station, an in-station connection means 23 of the slave station 2 sets a bypass speech channel between the caller terminal equipment A and the destination terminal equipment B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex communication system, and more particularly to a demand assignment for allocating a communication path between a master station and a slave station only when a call originates in a terminal device connected to the slave station. The present invention relates to a multi-directional multiplex communication system in which a plurality of communication systems performing control according to the method are connected via an exchange.

[0002]

2. Description of the Related Art Conventionally, a terminal station is composed of a slave station to which one or more terminal devices are connected and a master station to which a plurality of the slave stations are connected, and a call is originated to the terminal device. Only in the case of multi-direction communication, the call path allocation control means by the demand assignment method for allocating the call path between the master station and the slave station establishes a call path between the calling terminal device and the callee terminal device. A multiplex communication system is known (Japanese Patent Laid-Open No. 63-33020).

FIG. 5 is a block diagram showing the principle configuration of the above-mentioned conventional multiplex communication system, FIG. 6 is a time chart schematically explaining the operation of this conventional multiplex communication system, and FIG.
Shows a block diagram of an example of this conventional multiplex communication system.
In FIG. 5, when the slave station 2 detects a call from the calling terminal device A to the terminal device B connected to the same slave station, it notifies the parent station 1 of the call path allocation information via the information transmission path 6. To do.
When the master station 1 sends the call channel allocation information to the slave station 2 via the information transmission path 6, the slave station 2 receives the call channel allocation information and uses the allocated call channel 7 to send the callee information to the master station 1. Notice.

When the master station 1 detects from the callee information that the callee terminal device is the callee terminal device B connected to the same slave station 2 as the calling terminal device A,
The intra-station connection information is sent to the slave station 2 via the assigned communication path 7. As a result, the slave station 2 connects the calling terminal device A and the callee terminal device B by means of the intra-station connecting means, and the call between them is not passed through the master station 1 and the bypass call path in the slave station 2 is established. Through.

This will be further described with reference to FIGS. 6 and 7. In FIG. 7, 1a is a master station, 2a and 2b are slave stations, 3a, 4a and 5a are terminal devices connected to the slave station 2a, and 3b, 4b and 5b are respectively connected to a slave station 2b. Terminal devices 6a and 6b are connected between the master station 1a and slave stations 2a and 2b, respectively, and information transmission lines commonly used by the slave stations 7a and 7b are the master station 1a and the calling terminal device. It is an assigned call path connected between a connected slave station and a slave station to which the callee terminal device is connected.

Further, the master station 1a detects the call channel assignment request information detecting means 8, the call channel assignment controlling means 9, the call channel (No. 1 to n) 10, the call channel assigning information sending means 11, and the callee connection information. Means 12, intra-station connection determination means 13, intra-station connection information sending means 14, intra-station connection completion information detection means 1
5, the end-call information detecting means 16 and the intra-station connection release information sending means 17 are provided. On the other hand, each of the slave stations 2a and 2b has call detection means 18a and 18b, call path allocation request information sending means 19a and 19b, and callee connection information sending means 2 respectively.
0a, 20b, and end-call information sending means 21a, 21b,
In-station connection / release information detecting means 22a, 22b, in-station connecting means 23a, 23b, and in-station connection completion information sending means 2
4a and 24b.

In the multiplex communication system having the above structure,
When the terminal device 3a is the calling terminal device A and the terminal device 4a is the callee terminal device B, the slave station 2a uses the calling detection means 1
When the call originating from the terminal device 3a is detected by the 8a, the call allocation request information sending means 19a sends the call allocation request information a to the master station 1a via the information transmission path 6a as shown in FIG. 6 (A). To do.

The master station 1a has a speech path allocation request information detecting means 8
When the call allocation request information a is detected by the above, the call path allocation control means 9 allocates the call path 7a to the slave station 2a.
Is set, and an unused communication channel (for example, communication channel No. 1) is allocated from the n communication channels 10, and the communication channel 6 is transmitted by the communication channel allocation information transmitting means 11.
The channel allocation information b is returned to the slave station 2a via a as shown in FIG.

When the slave station 2a receives the call channel assignment information b, the callee connection information sending means 20a sends the call channel number 1 of the assigned call channel 7a as shown in FIG. 6B. Then, the callee connection information c is sent to the master station 1a. The master station 1a detects the callee connection information c by the callee connection information detecting means 12, and the in-station connection determining means 13 determines that the slave station 2a to which the callee terminal device 4a is connected is the calling terminal. It is determined that the device 3a is the same as the slave station 2a to which the device 3a is connected, and the intra-station connection information generated by the intra-station connection information sending means 14 is shown in FIG.
As shown by d in (B), the slave station 2a via the assigned communication path 7a.
Send to.

When the slave station 2a detects the intra-station connection information d by its intra-station connection / release information detecting means 22a, the intra-station connecting means 23a establishes a bypass communication path for directly connecting between the terminal devices 3a and 4a as shown in FIG. ) Is set as indicated by h. As a result, the terminal devices 3a and 4a can communicate with each other without going through the master station 1a. The slave station 2a generates intra-station connection completion information by the intra-station connection completion information sending means 24a and sends it to the master station 1a via the assigned communication path 7a as shown by e in FIG. 6 (B).

The master station 1a has an intra-station connection completion information detecting means 15
When the intra-station connection completion information e is detected by, the call path assignment control means 9 cancels the assignment of the assigned call path 7a set with the slave station 2a. After that, the terminal device 3a
When the call between the terminal and the terminal 4a ends, the slave station 2a detects the end call of the terminal device 3a or 4a, and the end call information sending means 21a.
Then, the call-end information is sent to the master station 1a via the information communication path 6a as indicated by f in FIG. 6 (A).

When the master station 1a detects the call termination information f by the call termination information detecting means 16, the intra-station connection release information sending means 17 causes the intra-station connection release information sending means 17 to release the intra-station connection of the bypass speech path connected in the slave station 2a. Figure 6 shows the disconnection information within the station
As indicated by g in (A), it is transmitted to the slave station 2a via the information transmission line 6a. Thus, the slave station 2a disconnects the bypass communication path between the terminal devices 3a and 4a connected by the intra-station connecting means 23a.

As described above, according to the conventional multiplex communication system described above, when the calling terminal device and the callee terminal device are connected to the same slave station, the call is made without the intervention of the master station 1a. Therefore, the call channel between the master station 1a and the slave station 2a or 2b is not occupied during the call, and the use efficiency of the call channel can be improved.

[0014]

The above-mentioned conventional multiplex communication system is often used by being connected to a public line, and one master station, a plurality of slave stations, and one or more connected to the slave stations. There are cases where a plurality of conventional multiplex communication systems including the above terminal devices are connected to a single exchange via a public line. That is, for example, as shown in FIG.
a, slave stations 2a and 2b, and terminal devices 3a to 5a and 3b to
A first conventional multiplex communication system including 5b, a master station 1b, slave stations 2c and 2d, and terminal devices 3c to 5c and 3d.
A second conventional multiplex communication system consisting of
A complex multiplex communication system commonly connected to the exchange 25 via public lines 26a and 26b may be conventionally configured.

In the above system, however, if the terminal device 3a connected to the slave station 2a is the calling terminal device and the terminal device 4c connected to the slave station 2c is the callee terminal device, Since the stations 1a and 1b have exactly the same management method and control method of the slave stations, it is not possible to determine whether the connection destination of the terminal device is the slave station of the own station or the slave station of another station. First slave station 2a, 2 of own station
It is erroneously determined that the call is between the terminal devices 3a and 4a, 3c and 4c connected to the mobile station c, and the master station 1a has the slave station 2a.
The intra-station connection is set and the sub-station 2c does not set the intra-station connection on the master station 1b side. As a result, the terminal devices 3a and 4a and the terminal devices 3c and 4c are erroneously connected.

The present invention has been made in view of the above points,
The master station is provided with its own / other station discrimination means for discriminating whether the calling terminal device and the callee terminal device are connected to the local station's slave station or to the other station's slave station to prevent erroneous connection. It is an object to provide an obtained multiplex communication system.

[0017]

In order to achieve the above object, the invention according to claim 1 is a system in which a plurality of slave stations to which a plurality of terminal devices are respectively connected are connected to one master station. , When the calling terminal device and the callee terminal device are respectively connected to the same slave station by the intra-station connection determination means of the master station, the call is made with the calling terminal device under the control of the master station. In a multiplex communication system in which a bypass call path is set between a calling terminal device and a callee terminal device via a child station by intra-station connecting means of a child station to which the callee terminal device is respectively connected, When the station determines by the intra-station connection determining means that the calling terminal device and the callee terminal device are respectively connected to the same slave station, the local station-identifying information assigned to the master station is sent to the host device. Send out and on The self-other station discrimination information input from the device is provided with a self-other station discrimination means for discriminating whether or not the self-other station discrimination information transmitted by the self station, and the self-other station discrimination information input to the self-other station discrimination means Only when it is determined that it is the self-other station discrimination information sent by the own station, the intra-station connection means of the slave station causes the bypass call path to be set between the calling terminal device and the callee terminal device. It is composed.

In the invention according to claim 2, there are a plurality of systems in which a plurality of slave stations to which a plurality of terminal devices are respectively connected to one master station are common to the same exchange through public lines respectively. In the multiplex communication system connected to the base station, at least the slave station has at least a slave station that has means for requesting a call channel allocation to the master station, means for notifying the master station of connection information of the call destination, and intra-station connection means. A means for notifying the slave station that has made a path allocation request of the call path allocation information via the information transmission path, and the calling terminal device and the callee terminal device are respectively connected to the same slave station. The intra-station connection determining means for determining whether or not the calling terminal device and the callee terminal device are respectively connected to the own station, and the own / other station identification information assigned to the parent station is provided to the public line. And send it to the exchange through , The own-other-station discrimination means for discriminating whether the own-other-station discrimination information input via the exchange is the self-other-station discrimination information sent by the own station, and the inputted own-other-station discrimination information transmitted by the own station. Only when it is determined that it is the own / other station discrimination information, at least the master station is provided with the control means for controlling the intra-station connection means so as to set the bypass call path between the calling terminal device and the callee terminal device. It is configured to have.

[0019]

FIG. 1 is a block diagram showing the principle configuration of the present invention.
The same components as those in FIG. 5 are designated by the same reference numerals. In FIG. 1, when the master station 31 determines by the intra-station connection determining means 32 that the calling terminal device A and the callee terminal device B are connected to the same slave station 2, respectively, the own station / other station determining means. 33 sends the self / other station discrimination information assigned to the master station 31 to the host device. Further, the own / other station discrimination means 33
Determines whether the own / other station discrimination information input from the host device is the own / other station discrimination information transmitted by the own station, and only when it is determined that the own / other station discrimination information is transmitted by the own station. Station 2
The intra-office connection means 23 establishes a bypass communication path between the calling terminal device A and the callee terminal device B.

Therefore, the present invention is applied to a multiple system in which a system in which a plurality of slave stations each connected to a plurality of terminal devices are connected to one master station is connected to a plurality of systems in common with the above-mentioned upper device. In this case, the master station can determine whether the slave station to which the calling terminal device and the callee terminal device are connected is the slave station of its own system or the slave station of another system.

Further, in the invention according to claim 2, there are a plurality of systems in which a plurality of slave stations to which a plurality of terminal devices are respectively connected to one master station are common to the same exchange through public lines respectively. In the multiplex communication system connected to, the master station can determine whether the slave station to which the calling terminal device and the callee terminal device are connected is a slave station of its own system or a slave station of another system.

Further, in the third aspect of the present invention, after the bypass communication path is set, the intra-station connection completion information is sent to the master station via the information transmission path or the assigned transmission path by the intra-station connection completion information sending means of the slave station. When the master station detects the input of this intra-station connection completion information, the master station cancels the allocated communication channel allocated to the slave station. Therefore, the calling terminal device and the called party terminal do not go through the master station. You can talk to the device.

[0023]

EXAMPLES Next, examples of the present invention will be described. FIG. 2 is a block diagram of an embodiment of the multiplex communication system of the present invention, and FIG. 3 is a time chart schematically explaining the operation of the multiplex communication system of the present invention. In both figures, the same components as those in FIGS. 6 and 7 are designated by the same reference numerals.

In FIG. 2, 31a is a master station, 2a and 2b.
Is a slave station 3a, 4a, 5a is a slave station 2a
Are connected to the slave station 2b, 6a and 6b are connected between the master station 1a and the slave stations 2a and 2b, respectively. The information transmission paths commonly used by the terminals 7a and 7b are allocations connected between the master station 1a and a slave station to which the calling terminal device is connected and a slave station to which the call destination terminal device is connected. The communication path, 35a, is a public line.

The present embodiment is characterized by the construction of the master station 31a, and the construction of the slave stations 2a, 2b is the same as that of the conventional apparatus shown in FIG. Similar to the conventional device, the master station 31a has a speech channel allocation request information detecting means 8, a speech channel allocation control means 9, a speech channel (No. 1 to n) 10, a speech channel allocation information sending means 1
1, a call destination connection information detecting means 12, an intra-station connection determining means 13, an intra-station connection information sending means 14, an intra-station connection completion information detecting means 15, an end-call information detecting means 16 and an intra-station connection release information sending means 17, Further, unlike the prior art, it has a self-other station discriminating means 33a. The own / other station discriminating means 33a is bidirectionally connected to the intra-station connection discriminating means 13, and the public line 35a.
It is connected to the.

Next, the operation of this embodiment will be described with reference to FIG. If the terminal device 3a is the calling terminal device A and the terminal device 4a is the callee terminal device B, the slave station 2
When the call detection means 18a detects a call from the terminal device 3a, as described above, the call path assignment request information sending means 19a causes the master station 31a via the information transmission path 6a.
Call allocation request information (a in FIG. 3 (B)) is sent to the master station 31a, which is detected by the call path allocation request information detecting means 8. Then, the master station 31a sets the allocated communication path 7a between the master station 31a and the slave station 2a by the communication path allocation control means 9, and an unused communication channel (for example, communication channel 1) from the n communication channels 10 is set. , And the channel allocation information sending means 11 returns the channel allocation information (b in FIG. 3B) to the slave station 2a via the information transmission path 6a.

As a result, the slave station 2a sends the callee connection information (c in FIG. 3 (C)) to the master station 1a by the callee connection information sending means 20a via the call channel No. 1 of the assigned call path 7a. Send to. At this time, the call channels other than the call channel 1 such as the call channel 2 of the assigned call path 7a are unused or are in use for another call, as schematically shown in FIG. 3 (D).

The master station 31a detects the callee connection information c by the callee connection information detecting means 12, and the in-station connection determining means 13 issues a call to the child station to which the callee terminal device 4a is connected. It is determined whether or not it is the same as the slave station to which the call terminal device 3a is connected, and the determination result is based on a request from the own / other station determining means 33a.
Output to a.

The self-other station discriminating means 33a indicates that the inputted judgment result indicates the same slave station (in this case, the calling terminal device 3a and the terminal device 4a of the communication partner are the same slave device). Connected to the station 2a), the own / other station discrimination information of the value pre-allocated to the own station is schematically shown by k in FIG. ). In addition, the own / other station discrimination means 33a
Determines the value of the inputted own / other station discrimination information via the public line 35a, as schematically shown by k'in FIG. 3 (A), and determines whether or not the value is the unique value assigned to the own station. To determine.

Only when the inputted own / other station discrimination information is a unique value assigned to the own station, the own / other station discriminating means 33a.
Causes the intra-station connection information transmitting means 14 to generate intra-station connection information through the intra-station connection determination means 13, and this is generated in FIG.
2d through the assigned communication path 7a as schematically shown in FIG.
Send to a.

Thereafter, as in the conventional apparatus, when the slave station 2a detects the intra-station connection information d by the intra-station connection / release information detecting means 22a, the intra-station connecting means 23a causes the terminal device 3 to operate.
Figure 3 shows a bypass communication path that directly connects a and 4a.
After the setting is made as schematically shown by (h) in (E), the in-station connection completion information is generated by the in-station connection completion information sending means 24a, and the allocated communication path 7a is generated as schematically shown by e in FIG. 3 (C).
To the master station 1a via. Thereby, the terminal device 3
A and 4a can talk without going through the master station 31a.

The master station 31a is an intra-station connection completion information detecting means 1
When the intra-station connection completion information e is detected by 5, the call path assignment control means 9 cancels the assignment of the assigned call path 7a set with the slave station 2a. After that, the terminal device 3
When the call between a and 4a ends, the slave station 2a detects the end call of the terminal device 3a or 4a, and the end call information sending means 21.
a to the master station 31a via the information communication path 6a.
To (f in FIG. 3 (B)).

The master station 31a detects the call-end information f by the call-end information detecting means 16 and uses the intra-station connection release information sending means 17 to release the intra-station connection of the bypass communication path connected in the slave station 2a. The intra-station connection release information is sent to the slave station 2a via the information transmission line 6a (g in FIG. 3 (B)). Thus, the slave station 2a disconnects the bypass communication path between the terminal devices 3a and 4a connected by the intra-station connecting means 23a.

As described above, according to the present embodiment, when the calling terminal device and the callee terminal device are slave stations connected to the master station 31a and are connected to the same slave station. Only, the call is made without passing through the master station 31a, and the own / other station discrimination information is transmitted. As a result, even in a multiplex communication system in which a plurality of communication systems having the same configuration as the above communication system are commonly connected to one exchange through a line such as a public line, normal intra-slave station connection can be achieved.

That is, FIG. 4 is a block diagram showing the connection of the same exchange in the multiplex communication system according to the present invention. The same components as those in FIGS. 2 and 8 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 4, the master station 31a is a two-way public line 35.
It is connected to the exchange 36 via a, and the master station 31b is also connected to the exchange 36 via a bidirectional public line 35b. The master station 31b has the same configuration as the master station 31a and is connected to the slave stations 2c and 2d. Therefore, in this embodiment, two communication systems having the same configuration are commonly connected to the exchange 36.

In the multiplex communication system having such a configuration, the calling terminal device and the callee terminal device are always connected through the exchange 36. Therefore, if the calling terminal device is the terminal device 3a, the callee device is called. Assuming that the terminal device is the terminal device 4a, the terminal devices 3a and 4a are connected to the same slave station 2a. 3, the own-other-station discrimination information is output to the public line 35a, and the own-other-station discrimination information is returned by the exchange 36.
As indicated by k'in (A), it returns to the own / other station discriminating means 33a through the public line 35a.

On the other hand, assuming that the calling terminal device is the terminal device 3a and the callee terminal device is the terminal device 4c, the terminal devices 3a and 4c are connected to the slave stations 2a and 2c of different master stations 31a and 31b. Therefore, the own / other station discrimination information output from the own / other station discrimination means 33a of the parent station 31a is input to the own / other station discrimination means 33b of the parent station 31b via the public line 35a, the exchange 36 and the public line 35b. To be done. Here, since the inputted self-other station discrimination information is not unique to the self-station, the self-other station discrimination means 33b does not perform intra-slave station connection to the slave station 2c, and the self-other station discrimination means 33a also. Since the own / other station discrimination information is not input through the public line 35a,
No intra-slave station connection is made to the slave station 2a.

In this way, according to the present embodiment, the master stations 31a and 31b transmit or input the input self / other station discrimination information by the self station, and whether or not it is returned. It is possible to determine whether it is a call within the own station or a call between the own station and another station because it can be determined whether it is a call between the local station and another station. The intra-slave station connection can be established only when the call is within the slave station.

In the above embodiment, the call destination connection information, the intra-station connection information, and the intra-station connection completion information have been described to be transmitted via the assigned transmission line. However, they may be transmitted using the information transmission line. May be. In addition, the exchange and the master station 31
The line between a and 31b is not limited to the public line, but may be another line such as a dedicated line.

[0040]

As described above, according to the first and second aspects of the present invention, the master station is the slave station to which the calling terminal device and the callee terminal device are connected is the slave station of the own system. Since it is determined to be a slave station of another system, intra-station connection between wrong slave stations can be prevented. . Further, claim 3
According to the described invention, since a call can be made between the calling terminal device and the callee terminal device connected to the same slave station without going through the master station, a call between the master station and the slave station is possible. The use efficiency of the channel can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a principle configuration of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a time chart for explaining the operation of the embodiment of the present invention.

FIG. 4 is a connection diagram of the same exchange in the system of the present invention.

FIG. 5 is a block diagram showing a conventional principle configuration.

FIG. 6 is a time chart for explaining a conventional operation.

FIG. 7 is a block diagram of an example of a conventional system.

FIG. 8 is a connection diagram of the same exchange in the conventional system.

[Explanation of symbols]

 2, 2a to 2d Slave station 3, 3a to 3d, 4a to 4d, 5a to 5d Terminal device 6, 6a to 6d Information transmission path 7, 7a to 7d Allocation transmission path 8 Speech path allocation request information detecting means 9 Speech path allocation Control means 10 Call channel 11 Call path allocation information sending means 12 Call destination information detecting means 13, 32 Intra-station connection determining means 14 In-station connection information sending means 15 In-station connection completion information detecting means 16 End-call information detecting means 17 In-station disconnection information Sending means 18a, 18b Call detection means 19a, 19b Call path allocation request information sending means 20a, 20b Call destination connection information sending means 21a, 21b End call information sending means 22a, 22b Intra-station connection / cancellation information sending means 23, 23a , 23b In-station connection means 31, 31a, 31b Master station 33, 33a, 33b Own-and-other-station discrimination means 35a, 35b Shu line 36 exchange

Claims (3)

[Claims] 1. A system in which a plurality of slave stations each connected to a plurality of terminal devices are connected to one master station, and a calling terminal device and a callee terminal device are connected to the same slave station, respectively. If it is determined by the intra-station connection determining means of the master station, the inside of the slave station in which the calling terminal device and the callee terminal device are respectively connected under the control of the master station In a multiplex communication system in which a connecting means sets a bypass communication path between the calling terminal device and a callee terminal device via the slave station, the master station is a calling terminal by the intra-station connection determining means. When it is determined that the device and the callee terminal device are respectively connected to the same slave station, the own / other station discrimination information assigned to the master station is sent to the higher-level device and input from the higher-level device. The discriminated information of the self-other station The own / other station discrimination means for judging whether or not the own / other station discrimination information transmitted by the station is provided, and the own / other station discrimination information input to the own / other station discrimination means is the own / other station discrimination information transmitted by the own station. Only when it is determined that there is
A multiplex communication system characterized in that a bypass communication path is set between the calling terminal device and the callee terminal device by means of the intra-station connecting means of the slave station. 2. A multiple communication system in which a plurality of slave stations, each of which is connected to a plurality of terminal devices, are connected to one master station, and which are commonly connected to the same exchange through a public line. There, the slave station, upon detecting a call from the connected terminal device, means for requesting the channel allocation to the master station via the information transmission path, and the allocated channel or the information transmission path. Means for notifying the callee connection information to the master station, and when the calling terminal device and the callee terminal device are connected to the same slave station, the caller terminal device and the callee terminal device And at least an intra-station connection means for setting a bypass speech path between the parent station and the parent station, and notifies the child station that has made the speech path allocation request of the speech path allocation information via the information transmission path. Means for connecting, Based on the information, the intra-station connection determining means for determining whether or not the calling terminal device and the callee terminal device are respectively connected to the same slave station, the calling terminal device and the callee terminal device are respectively It determines whether or not it is connected to its own station, sends out the own-other station identification information assigned to the parent station to the exchange through the public line, and also inputs the own-other station through the exchange. Self-other station discrimination means for discriminating whether or not the discrimination information is the self-other station discrimination information sent by the own station, and the inputted self-other station discrimination information is the self-other station discrimination information sent by the self-station. It has at least a control means for controlling the intra-station connection means of the slave station so as to set a bypass communication path between the calling terminal device and the destination terminal device only when judged by the station judgment means. Multiple communication system characterized by Tem. 3. The intra-station connection completion information, wherein the slave station sends the intra-station connection completion information to the master station via the information transmission path or the assigned transmission path after the bypass communication path is set by the intra-station connection means. Sending means, means for sending the call-ending information to the master station via the information transmission path when the call-ending between the calling terminal device and the callee terminal device is detected, and input from the master station Further comprising means for canceling the setting of the bypass call path between the calling terminal device and the callee terminal device, based on the intra-station connection release information, the master station, the intra-station connection completion information Means for canceling the allocated speech path allocated to the slave station when the input of is detected, and, when the input of the end call information is detected, to the slave station which sent the end call information via the information transmission path. Means for transmitting the intra-station disconnection information, Multiplex communication system according to claim 2, further comprising.