JPH08289006A - Subscriber accommodation system - Google Patents

Abstract

PURPOSE: To allow the system to connect an exchange for general subscribers to a remote subscriber and to effectively utilize a PCM channel between the general subscriber and the remote subscriber. CONSTITUTION: When a state of a remote subscriber changes between an on- hook state and an off-hook state, a remote subscriber controller 33 stores state information of the remote subscriber based on a message sent from a remote terminal 16. A host interface 34 sends a state monitor signal to a station exchange 21 at all times based thereupon. Furthermore, the remote subscriber controller 33 converts an incoming call signal from the station exchange into a message and sends the message to the remote terminal 16. A channel controller 32 selects an idle channel among PCM channels 14 to secure a speech channel. Since the message is converted into a signal form of the station exchange, the remote subscriber is connected to a general subscriber use exchange. Since the idle channel is selected to secure the speech channel, the PCM channel is effectively utilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber accommodation system for accommodating a subscriber in a central office switch, and more particularly to a subscriber accommodation system capable of accommodating a subscriber at a remote place.

[0002]

2. Description of the Related Art When a subscriber in a service area of a central office moves out of the service area, the subscriber is usually re-registered in the central office having his / her destination in the service area. If the central office switch changes, at least the central number of the telephone number will change. For this reason, the subscriber has to inform the various places that the telephone number has changed, which is troublesome. Therefore, there is a case where a subscriber who has moved to a remote place outside the service area is accommodated in a central office switch before moving. A subscriber accommodation system capable of accommodating subscribers in a remote area outside the service area in addition to subscribers in the service area is called a remote subscriber accommodation system.

FIG. 5 shows an outline of the configuration of a remote subscriber accommodation system which has been used conventionally. The intra-station subscriber 101 is connected to a central office switch 103 via a subscriber accommodation device 102. The remote subscriber 104
It is housed in the digital trunk 106 through the remote terminal 105. Digital trunk 10
6 and the digital trunk 107 are PCM (Pulse Cod
e Modulation) A dedicated line is connected through a fixed channel of the line 108. The digital trunk 107 is
It is connected to the central office switch 103. A signal conversion unit 109 for remote subscribers is connected to the central office switch 103.

Normally, an interface is performed by a message for call processing such as making and receiving calls with a remote terminal connected to a leased line. Further, an interface between the subscriber accommodation device accommodating general subscribers in the station and the central office exchange is performed by a signal of a different type from the message. The signal conversion unit 109 provided in the local exchange 103 is a circuit that converts a message type signal from the remote terminal 105 connected to the private line into a signal of the same type as a signal from a general subscriber in the station. The signal conversion unit 109 is provided only for a predetermined line with the remote subscriber of the central office switch 103. Other lines not provided with the signal conversion unit 109 can connect general subscribers in the station. Such a remote subscriber accommodation system is disclosed in Japanese Patent Laid-Open No. 64-10757.

[0005]

In this remote subscriber accommodation system, since the signal conversion unit is provided in the local exchange, the lines provided in the local exchange are preliminarily distinguished between general subscribers and remote subscribers. . For this reason, the number of remote subscribers that can be accommodated is limited to the number of signal conversion units provided in the central office switch, and conversely, there may be more lines for remote subscribers than necessary, and the central office switch may be used. There is a problem that it cannot be used effectively. Further, since the signal converter is provided in the intra-office exchange, it is not possible to use the existing intra-exchange to connect only general subscribers to accommodate the remote subscribers. Therefore, there is a problem in that the exchange itself must be replaced to accommodate the remote subscriber. Furthermore, since the remote subscriber is connected to the fixed line of the PCM line by a dedicated line, there is a problem that the PCM line cannot be effectively used.

Therefore, an object of the present invention is to provide a subscriber accommodating system in which a remote subscriber can be connected by using an exchange for general subscribers and a PCM line with a remote subscriber can be effectively used. To do.

[0007]

According to a first aspect of the present invention, there is provided a telephone device connected to control for setting and releasing a call using a state monitoring signal indicating whether the telephone device is in an on-hook state or an off-hook state. It shows the telephone equipment that has changed its state when the on-hook exchange is connected to an arbitrary number of telephone equipments and they change from the on-hook state to the off-hook state or from the off-hook state to the on-hook state, and the state after the change. A subscriber accommodation means for sending a message, a signal line for communication between the subscriber accommodation means and an exchange, and a telephone device provided on the exchange side of the signal line, which is one of an on-hook state and an off-hook state. To store status information indicating in which status each telephone device connected to the subscriber accommodation means Status storing means, message receiving means for receiving a message sent from the subscriber accommodating means through the signal line, and status information stored in the state storing means when the message is received by the message receiving means Based on the state information stored in the storage state changing means and the state information stored in the state storage means, a state monitoring signal for the telephone device connected to the subscriber accommodation means is generated and sent to the exchange. The subscriber accommodation system is provided with a state monitoring signal generating means for inputting.

That is, according to the first aspect of the invention, the telephone connected to the subscriber accommodation means based on the message sent when the telephone device changes from the on-hook state to the off-hook state or vice versa. The state of the device is stored in the state storage means. Then, a state monitoring signal is generated based on the stored contents of the state storage means and is input to the exchange. In this way, since the status of the telephone connected to the subscriber accommodation means is held in the status storage means, the status monitoring signal can be generated and input to the exchange at any time.

According to the second aspect of the present invention, a state monitoring signal indicating whether the telephone device is in an on-hook state or an off-hook state, and when there is an incoming call, an incoming call indicating that there is an incoming call with the destination telephone device. An exchange that uses signals to control call setup and cancellation with a connected telephone device, and when any number of telephone devices are connected and these change from an on-hook state to an off-hook state or from an off-hook state to an on-hook state. When a state change occurs, a message indicating the state change state telephone device and the state after the change is transmitted, and the presence of an incoming call to the connected telephone device is detected by receiving a predetermined incoming call message. Means for accommodating subscribers, a signal line for communicating between the means for accommodating subscribers and an exchange, and a signal line provided on the exchange side of the signal line. A subscriber through the signal line, a status storage means for storing status information indicating whether the telephone device is in an on-hook state or an off-hook state for each telephone device connected to the subscriber accommodation means. Message receiving means for receiving the message sent from the accommodating means, and storage state for changing the state information stored in the state storing means when the message is received by the message receiving means according to the content of the received message From the exchange, the changing means and the state monitor signal generating means for generating a state monitor signal for the telephone device connected to the subscriber accommodation means based on the state information stored in the state storage means and inputting the state monitor signal to the exchange. The output incoming call signal represents the telephone device connected to the subscriber accommodation means as the called destination telephone device. And it is provided to subscriber accommodation system and a called message sending means for sending the subscriber accommodation device through which a signal line to generate an incoming call message when you are.

That is, according to the second aspect of the invention, the state of the telephone connected to the subscriber accommodation means is held in the state storage means, and based on this, a state monitoring signal is generated and input to the exchange. . Also, the incoming signal from the exchange is converted into a message and sent to the subscriber accommodation means. As a result, it is possible to connect the subscriber accommodating means, which interfaces with a message, to the exchange which interfaces with setting and cancellation of a call by the status monitoring signal and the incoming signal.

According to the third aspect of the present invention, a state monitoring signal indicating whether the telephone device is in an on-hook state or an off-hook state, and when there is an incoming call, an incoming call indicating that there is an incoming call with the destination telephone device. An exchange that uses signals to control call setup and cancellation with a connected telephone device, and when any number of telephone devices are connected and these change from an on-hook state to an off-hook state or from an off-hook state to an on-hook state. When a state change occurs, a message indicating the state change telephone set and the state after the change is transmitted, and the presence of an incoming call to the connected telephone set is detected by receiving a predetermined incoming call message. A plurality of channels are provided for communication between the subscriber accommodation means for performing the communication, and the subscriber accommodation means and the exchange, and messages are transmitted among them. A subscriber line accommodating means, which has a signal line to which a control channel for fixed transmission is fixedly assigned, and status information indicating whether the telephone device provided on the exchange side of the signal line is in an on-hook state or an off-hook state. State storage means for storing for each telephone device connected to, message receiving means for receiving a message coming from the subscriber accommodation means via the control channel, and state when the message is received by this message receiving means Storage state changing means for changing the state information stored in the storage means according to the content of the message, and a telephone device connected to the subscriber accommodation means based on the state information stored in the state storage means Status monitoring signal generation means for generating a status monitoring signal for An incoming call message sending means for generating an incoming call message and sending the incoming call message to the subscriber accommodation means through the control channel when the incoming call signal representing the telephone equipment connected to the subscriber accommodation means as the called destination telephone equipment. And the message received by the message receiving means from the on-hook state to the off-hook state when the incoming call signal output from the exchange represents the telephone apparatus connected to the subscriber accommodation means as the called-destination telephone apparatus. , The channel accommodating means for allocating a channel in a vacant state from the signal lines and allocating it as a communication path with the telephone device connected to the subscriber accommodating means is accommodated by the subscriber. It is equipped in the system.

That is, in the invention described in claim 3, the signal line comprises a plurality of channels, of which the control channel is fixedly allocated for message transmission. Then, when it becomes necessary to secure a communication path between the subscriber accommodation means and the exchange, an empty channel is allocated.

According to the fourth aspect of the present invention, a status monitoring signal indicating whether the telephone device is in the on-hook state or the off-hook state, and when there is an incoming call, it indicates that there is an incoming call to the destination telephone device. An exchange that uses call signals to control call setup and cancellation with the connected telephone device, and when any number of telephone devices are connected and these change from the on-hook state to the off-hook state or from the off-hook state. By transmitting a message indicating the telephone device in which the state has changed when the state changes to the on-hook state and the state after the change and receiving a predetermined incoming call message indicating that the connected telephone device has an incoming call. The subscriber accommodation means to be detected and a plurality of channels for communication between the subscriber accommodation means and the exchange are provided and the message is transmitted. Signal channel to which a control channel for communication and a congestion sound channel for transmitting the congestion sound obtained from the exchange to the subscriber accommodation means are fixedly assigned, and the telephone device provided on the exchange side of the signal line is on-hook. State storage means for storing state information indicating which of the state and the off-hook state is in each telephone device connected to the subscriber accommodation means,
Message receiving means for receiving a message arriving from the subscriber accommodating means through the control channel, and the status information stored in the status storing means when the message is received by the message receiving means is changed according to the content of the message. Storage state changing means, and state monitoring signal generation means for generating a state monitoring signal for the telephone device connected to the subscriber accommodation means based on the state information stored in the state storage means and inputting it to the exchange. , An incoming call message is generated when the incoming call signal output from the exchange represents a telephone device connected to the subscriber accommodation means as the telephone device of the call destination, and this is sent to the subscriber accommodation means through the control channel. The incoming call message sending means and the incoming call signal output from the exchange are connected to the subscriber accommodation means as a telephone device of the called party. The telephone device being used, or the message received by the message receiving means indicates a state change from the on-hook state to the off-hook state, the idle channel is selected from the signal lines and the subscriber selects it. A channel assigning means to be assigned as a speech path to a telephone device connected to the accommodating means, and a congestion sound to send the congestion sound from the exchange to the subscriber accommodating means through the congestion sound channel when there is no empty channel to be allocated as the speech path. The sending means is provided in the subscriber accommodation system.

That is, in the invention as set forth in claim 4, the signal line is provided with a plurality of channels, of which a control channel for transmitting a message and a congestion sound channel for transmitting a congestion sound obtained from the exchange are fixedly assigned respectively. There is.
Then, when it becomes necessary to secure a communication path between the subscriber accommodation means and the exchange, an empty channel is selected and assigned. When a free channel cannot be secured, the congestion sound channel sends the congestion sound from the exchange to the subscriber accommodation means.

In a fifth aspect of the present invention, the signal line is a pulse code modulation line for modulating information into a pulse code and transmitting it.

That is, in the fifth aspect of the invention, a pulse code modulation line is used as a signal line with the subscriber accommodation device. Since the information can be transmitted over a long distance by pulse-encoding the information, it is suitable as a signal line when arranging the subscriber accommodation means at a place remote from the exchange, for example.

According to another aspect of the present invention, the subscriber accommodation means is located at a remote place outside the service area of the exchange.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows the configuration of a subscriber accommodation system according to an embodiment of the present invention. here,
An example of a remote subscriber accommodation system that accommodates subscribers at remote locations will be described. Remote subscriber accommodation system 11 is part 1
2 and the remote part 13 and a PC for transmitting signals between them
It is composed of an M line 14. The remote subscriber 15
It is a communication device such as a telephone or a facsimile. The remote terminal 16 is a terminal device having a function of converting the status of the remote subscriber 15 into a message. For example, when the remote subscriber goes off-hook, it is converted into a message and sent to the PCM line 14. Although only one remote subscriber is connected in the figure, the remote terminal 16 can accommodate a plurality of remote subscribers. The digital trunk 17 is a PCM as a public communication network.
An interface circuit for connecting to the line 14. The PCM line has a plurality of channels. A predetermined channel among these is fixedly assigned for transmitting a control message. Also, one other channel is fixedly assigned to send a congestion tone to the remote subscriber when a channel for a call is not available.

The in-office section 12 is provided with a central office 21 capable of handling signaling types to and from general subscribers. An in-station subscriber 23 is connected to the office exchange 21 via a subscriber accommodation device 22. Although only one intra-station subscriber 23 is shown in the figure, the subscriber accommodation device 22 can accommodate a large number of intra-station subscribers. Then, the subscriber accommodation device 22 sequentially scans the connected intra-station subscribers and sends a scan signal (hereinafter, referred to as an SCAN signal) indicating whether each is in an off-hook state or an on-hook state to the intra-office exchange. 21 is output. Further, a control signal (hereinafter referred to as an SD signal) for controlling the operation of each in-station subscriber is sent from the in-office exchange 21 to the subscriber accommodation device 22. The intra-office exchange 21 interfaces with the subscriber accommodation device 22 by the SCAN signal and the SD signal.

The PCM line 14 is connected to the central office switch 21 via a digital trunk 24, a digital trunk interface 25 and a remote relay device 26. The remote relay device 26 is a circuit portion for mutually converting an interface with a remote subscriber by a message and an interface with a central office 21 by a SCAN signal and an SD signal. The digital trunk interface 25 is a circuit that interfaces between the remote relay device 26 and the digital trunk 24.

The remote relay device 26 includes a time division speech path 31 for time division multiplexing and demultiplexing signals and a PCM line 1.
Channel control device 3 which secures an empty channel from among 4
2 and a remote subscriber control device 33 for analyzing a message
It has and. It also has a host interface 34 that interfaces with the central office switch 21.

FIG. 2 shows the configuration of the remote relay device in more detail. The same circuit portions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted as appropriate. The remote subscriber control device 33 includes a remote subscriber control circuit 41, a state holding circuit 42, and a control signal analysis circuit 43. The remote subscriber control circuit 41 has a function of analyzing a message from a remote subscriber. If this message is calling information, the channel controller 3
2 is instructed to reserve a free channel, and a message is sent to notify the remote subscriber of the secured channel number. Further, it has a function of notifying the state holding circuit 42 that a channel has been secured with the remote subscriber or that the channel has been released.

The state holding circuit 42 has the same number of connected remote subscribers as the state holding memory (not shown) for storing whether the remote subscriber is in the off-hook state or the on-hook state. A value of "1" in the status holding memory indicates that the corresponding remote subscriber is off hook. Further, when the value of the status holding memory is "0", it indicates that the corresponding remote subscriber is on-hook. The state holding circuit 42 changes the value of each state holding memory in accordance with the notification from the remote subscriber control circuit 42 indicating that the channel is reserved or the channel is released.

The upper interface section 34 has a function of generating a SCAN signal based on the information on whether each remote subscriber is on-hook or off-hook stored in the state holding circuit 42 and sending it to the central office switch 21. . The format of this signal is the same as the SCAN signal between the subscriber accommodation device 22 and the central office switch 21. The control signal analysis circuit 43 uses the upper interface 43 to exchange data for the central office 2
It is a circuit that detects the SD signal sent from the device 1 and analyzes the control content. For example, when the SD signal is the incoming call information, the remote subscriber control circuit 41 is informed of which remote subscriber the incoming call is, and the result is notified. At this time, exclusive control is performed in order to avoid contention with a call made by a remote subscriber.

By performing signal type conversion by the remote relay device 26, a PC can be added to the central office switch 21 that interfaces with the SCAN signal and the SD signal.
It is possible to accommodate a remote subscriber 15 connected through the M line 14.

Next, the operation of the remote subscriber accommodation system when the remote subscriber makes a call will be described.

FIG. 3 shows a flow of operation of the remote subscriber accommodation system when the remote subscriber makes a call. When the remote subscriber 15 goes off-hook, the remote terminal 16 detects this and creates a message indicating that it has gone off-hook. This message is P
It is sent to the remote relay device 26 through a fixed channel of the CM line 14 that is assigned in advance for control information.
The remote relay device 26 is waiting for a message to arrive (step S101). When the message is received (step S101; Y), the remote subscriber control device 33
The content of the message is analyzed by the remote subscriber control circuit 41.

When the received message indicates calling information (step S102; Y), the remote subscriber control circuit 41 instructs the channel controller 32 to select an empty channel. In response to this instruction, the channel control device 32 searches for an empty channel (step S103). When there is an empty channel (step S104; Y),
The channel is captured (step S105). The remote subscriber control circuit 41 sends a message representing the captured channel number to the remote subscriber who is the sender of the call information (step S106). Further, the state holding circuit 42
Notify that the call information has been received. As a result, the value of the state holding memory associated with the remote subscriber who is the source of the call information is set to "1" (step S10).
7).

If there is no free channel (step S
104; N), the number of the channel fixedly assigned for returning the congestion sound is notified to the remote subscriber who is the sender of the calling information by a message (step S108). As a result, when the idle channel cannot be captured, the congestion sound is transmitted from the remote relay device side to the remote subscriber. Since the remote subscriber is off-hook even when the congestion sound is being sent, the value of the corresponding state-holding memory is set to "1" (step S107).

When the remote subscriber ends the call, the remote terminal 16 sends a message indicating the end of the call. When the received message indicates the end of communication (step S109; Y), the remote relay device releases the acquired channel to the remote subscriber (step S110). Then, the value of the corresponding state holding memory is reset to "0" (step S111). When the received message does not indicate the end of the communication (step S109; N), a predetermined process corresponding to the content of the message is performed (step S112) and the process ends (end).

As described above, the state holding circuit 42 stores whether each remote subscriber is in the off-hook state or the on-hook state based on the message such as the call origination or the termination. The upper interface 34 is
On this basis, SCAN signals for remote subscribers can be generated at any time. Therefore, the central office switching equipment can handle the intra-station subscriber and the remote subscriber by the same interface without distinguishing them.

Next, the operation of the remote subscriber accommodation system in the case of an incoming call will be described.

FIG. 4 shows a flow of operations of the remote subscriber accommodation system when an incoming call is received. In the case of an incoming call, an SD signal of the same type as that sent to the subscriber accommodation device 22 is input from the central office switch 21 to the remote relay device 26. The control signal analysis circuit detects the SD signal through the host interface 34. The control signal analysis circuit 43 determines whether the control information by the SD signal is an incoming call (step S201). If it is not an incoming call request (step S201; N), the corresponding process is performed (step S202) and the process is terminated. In the case of an incoming call request (step S201; Y), which remote subscriber is the incoming call request is analyzed (step S203), and the result is notified to the remote subscriber control circuit 41. Upon receiving the incoming call request, the remote subscriber control circuit 41 checks the value of the state holding memory associated with the remote subscriber who is the called side (step S204).

When the value of the corresponding state-holding memory is "1", indicating the off-hook state (step S20)
5; Y), ignoring the incoming call request and immediately setting the call state (step S206). When the value of the corresponding state-holding memory is "0", which indicates the on-hook state (step S205; N), the state-holding memory is write-protected (step S207). This is to cope with the competition of incoming and outgoing calls inside the remote relay device 26.
The remote subscriber control circuit 41 sends a predetermined instruction to the channel controller 32 to capture an empty channel (step S
208). A message indicating that the captured channel number and an incoming call request has been issued is sent to the remote subscriber on the called side (step S209). After that, the write-protection of the state-holding memory is released (step S210), the value of the corresponding state-holding memory is set to "1", and the process ends (end).

As described above, when an incoming call is received, the SD signal from the central office switch is analyzed, and the remote subscriber represented by the SD signal is notified by a message. This makes S
It is possible to connect a remote subscriber that interfaces with a message to an intra-office exchange that interfaces with a D signal. Further, even in the case of an incoming call, since the free channel of the PCM line is captured by the remote relay device side, it is not necessary to fixedly allocate the channel to the remote subscriber, and the line can be effectively used.

[0037]

As described above, according to the first aspect of the invention, the state of the telephone device connected to the subscriber accommodation means is maintained based on the message sent only when the state change occurs. Therefore, the status monitoring signal can be generated and input to the exchange at any time. Therefore, it is possible to easily connect the subscriber accommodating means, which interfaces with the message, to the exchange which interfaces with the setting and cancellation of the call by the status monitoring signal.

According to the second aspect of the invention, the state of the telephone connected to the subscriber accommodation means is held in the state storage means, and based on this, a state monitoring signal is generated and input to the exchange. ing. Also, the incoming signal from the exchange is converted into a message and sent to the subscriber accommodation means. As a result, it is possible to easily connect the subscriber accommodating means, which interfaces with a message, to the exchange which interfaces with setting and cancellation of a call by the status monitoring signal and the incoming signal.

According to the third aspect of the present invention, when it becomes necessary to secure a communication path between the subscriber accommodation means and the exchange, an empty channel is selected and assigned. Channels can be effectively used as compared with the case of allocating dedicated channels.

According to the fourth aspect of the invention, when the idle channel cannot be secured, the congestion sound channel from the exchange is sent to the subscriber accommodation means by the congestion sound channel which is fixedly fixed in advance. Even when there are no available channels, the congestion tone can be sent to the telephone device at the remote place, and therefore the response tone that is the same as when it is directly connected to the exchange can be returned to the caller.

Further, according to the invention of claim 5, the pulse code modulation line is used for transmission to and from the subscriber accommodation means. Since the pulse code modulation line is capable of long-distance transmission with little deterioration, it is particularly suitable as a signal line when the subscriber accommodation means is arranged in a remote place.

According to the invention of claim 6, the subscriber accommodation means is arranged at a remote place outside the service area of the exchange. Outside the service area, it is not possible to interface with normal status monitoring signals and incoming signals due to signal deterioration, but since the message was converted to these signal types on the exchange side of the signal line, the means for accommodating subscribers was covered by the service area. Can be placed outside.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a subscriber accommodation system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a remote relay device in the subscriber accommodation system shown in FIG.

FIG. 3 is a flowchart showing an operation flow of a remote subscriber accommodation system when a remote subscriber makes a call.

FIG. 4 is a flowchart showing an operation flow of a subscriber accommodation system in an incoming call.

FIG. 5 is a block diagram showing an outline of the configuration of a conventionally used subscriber accommodation system.

[Explanation of symbols]

 11 Remote Subscriber Accommodating System 12 Station Part 13 Remote Part 14 PCM Line 15 Remote Subscriber 16 Remote Terminal 21 Station Switch 26 Remote Relay Device 31 Time Division Call Path 32 Channel Controller 33 Remote Subscriber Controller 34 Upper Interface 41 Remote Subscriber control circuit 42 State holding circuit 43 Control signal analysis circuit

Claims (6)

[Claims] 1. An exchange that performs control for call setup and cancellation with a connected telephone device using a state monitoring signal indicating whether the telephone device is in an on-hook state or an off-hook state, and an arbitrary number of telephone devices. And a subscriber accommodating means for transmitting a message indicating the telephone device which has been connected and has changed its state when the state changes from the on-hook state to the off-hook state or when the state changes from the off-hook state to the on-hook state. A signal line for communication between the subscriber accommodation means and the exchange, and status information indicating whether the telephone device provided on the exchange side of the signal line is in an on-hook state or an off-hook state. A status storage means for storing each of the telephone devices connected to the subscriber accommodation means, Message receiving means for receiving a message sent from the subscriber accommodating means through the line, and content of the message received status information stored in the status storing means when the message is received by the message receiving means. A storage state changing means for changing the storage state changing means and a state monitoring signal for the telephone device connected to the subscriber accommodating means, based on the state information stored in the state storing means, to the exchange. A subscriber accommodation system comprising: a condition monitoring signal generating means for inputting. 2. A state monitoring signal indicating whether the telephone device is in an on-hook state or an off-hook state, and when an incoming call is received, a call signal is transmitted using the incoming call signal indicating that there is an incoming call with the destination telephone device. An exchange that performs control of setting and release with the connected telephone device, and the state when any number of telephone devices are connected and these change from the on-hook state to the off-hook state or from the off-hook state to the on-hook state. A subscriber accommodating means for sending out a message indicating the changed telephone device and the state after the change and detecting the presence of an incoming call to the connected telephone device by receiving a predetermined incoming call message. , A signal line for communicating between the subscriber accommodation means and the exchange, and a telephone device provided on the exchange side of the signal line is turned on. Status storage means for storing status information indicating which of the on-hook status and the off-hook status for each telephone device connected to the subscriber accommodation means, and the subscriber through the signal line. Message receiving means for receiving a message sent from the accommodating means, and storage for changing the state information stored in the state storing means when the message is received by the message receiving means according to the content of the received message State changing means and state monitoring signal generation for generating the state monitoring signal for the telephone device connected to the subscriber accommodation means based on the state information stored in the state storage means and inputting the state monitoring signal to the exchange. Means for receiving the incoming call signal output from the exchange as a telephone device of a called destination. An incoming call message sending means for generating the incoming call message when representing a telephone device connected to and sending the incoming call message to the subscriber receiving means through the signal line. 3. A state monitoring signal indicating whether the telephone device is in an on-hook state or an off-hook state, and when there is an incoming call, the telephone device of the called destination is called by using an incoming call signal indicating that there is an incoming call. An exchange that performs control of setting and release with the connected telephone device, and the state when any number of telephone devices are connected and these change from the on-hook state to the off-hook state or from the off-hook state to the on-hook state. A subscriber accommodating means for transmitting a message indicating the changed telephone device and the state after the change and detecting that there is an incoming call to the connected telephone device by receiving a predetermined incoming call message. , A plurality of channels are provided for communication between the subscriber accommodation means and the exchange, and a control channel for transmitting the message is provided. A signal line to which a channel is fixedly assigned, and status information indicating whether the telephone device, which is provided on the exchange side of this signal line, is in the on-hook state or the off-hook state, to the subscriber accommodation means. State storage means for storing each connected telephone device, message receiving means for receiving a message coming from the subscriber accommodation means through the control channel, and when a message is received by the message receiving means A storage state changing unit that changes the state information stored in the state storage unit according to the content of the message, and a connection to the subscriber accommodation unit based on the state information stored in the state storage unit. Status monitoring signal for generating the status monitoring signal for the telephone device in use and inputting it to the exchange. Means for generating the incoming call message when the incoming call signal output from the exchange represents a telephone device connected to the subscriber accommodating means as a telephone device of a called destination, and the incoming call message is generated by the control channel. An incoming call message sending means for sending to the subscriber accommodating means through the telephone, and the incoming call signal output from the exchange represents a telephone device connected to the subscriber accommodating means as a telephone device of a called destination, or When the message received by the message receiving means indicates a state change from the on-hook state to the off-hook state, a channel in the idle state is selected from the signal lines and the telephone device connected to the subscriber accommodation means. A subscriber accommodating system, comprising: a channel allocating means for allocating as a communication path to and from. 4. A call is made using a status monitoring signal indicating whether the telephone device is in an on-hook state or an off-hook state and an incoming call signal indicating that there is an incoming call with the telephone device of a called destination when there is an incoming call. When a switch that controls the setting and cancellation of the connection with the connected telephone device and an arbitrary number of telephone devices are connected and these change from the on-hook state to the off-hook state or from the off-hook state to the on-hook state Subscriber accommodating means for transmitting a message indicating the state-changed telephone device and the state after the change and detecting that a connected telephone device has an incoming call by receiving a predetermined incoming call message. A plurality of channels for communication between the subscriber accommodation means and the exchange, and a control for transmitting the message And a signal line to which a congestion sound channel for transmitting the congestion sound obtained from the exchange to the subscriber accommodation means is fixedly assigned, and the telephone device provided on the exchange side of the signal line is in the on-hook state. From the subscriber accommodating means through the control channel, status storage means for storing status information indicating which one of the off-hook statuses is in the respective telephone devices connected to the subscriber accommodating means. Message receiving means for receiving an incoming message; storage state changing means for changing the state information stored in the state storing means when the message is received by the message receiving means according to the content of the message; It is connected to the subscriber accommodation means based on the state information stored in the state storage means. Status monitoring signal generation means for generating the status monitoring signal for the telephone device and inputting it to the exchange, and the incoming call signal output from the exchange device is connected to the subscriber accommodation means as the telephone device of the call destination. An incoming call message indicating that the incoming call message is output to the subscriber accommodation means through the control channel, and the incoming call signal output from the exchange is the destination of the incoming call. In the signal line when the telephone device connected to the subscriber accommodating means is represented as the telephone device or when the message received by the message receiving means represents the state change from the on-hook state to the off-hook state. Select a free channel from the list and assign this as the communication path to the telephone device connected to the subscriber accommodation means. A subscriber comprising: a channel allocating means for allocating and a congestion sound transmitting means for transmitting the congestion sound from the exchange to the subscriber accommodating means through the congestion sound channel when there is no free channel to be allocated as a communication path. Containment system. 5. The subscriber accommodation system according to claim 1, wherein the signal line is a pulse code modulation line for modulating information into a pulse code and transmitting the information. 6. The subscriber accommodation system according to claim 1, wherein the subscriber accommodation means is arranged at a remote place outside the service area of the exchange.