JP4300094B2 - Telephone exchange equipment - Google Patents

Description

  The present invention performs a call operation only in accordance with a private line number plan without making the caller aware of the contract number of the callee's public network in a network in which a plurality of private branch exchanges are connected via the public network. The present invention relates to a telephone exchange apparatus that provides a function equivalent to a dedicated line that can directly call a called party extension.

Conventionally, when an extension telephone is used between establishments in a company having multiple establishments, a method of connecting to each other by dialing on the basis of a private line number plan after contracting a dedicated line between establishments. is there. However, due to recent changes in communication carriers, it is possible to use the public network with a fixed communication fee.
2. Description of the Related Art A system that uses a communication network that uses an Internet protocol to reduce communication costs and provides a service equivalent to a dedicated line is known. (For example, refer to Patent Document 1.)

  Therefore, according to the private leased line system using the conventional public network, the telephone exchange devices are connected by using an adapter (so-called gateway), the number is converted and the destination is determined. You can get a service that is no different from using a general leased line.

Also, when specific caller ID information is received using caller ID information in response to an incoming call from the public network, the telephone exchange automatically responds to the dial information (connection partner) using the direct in-dial method. There is also known a method of receiving an extension telephone and calling an extension telephone. (For example, refer to Patent Document 2.)
Japanese Patent Application No. 5-135 Japanese Patent Application No. 7-217210

  However, according to the conventional virtual leased line system described in Patent Document 1, it is possible to obtain the same service as that of the leased line, but the capital investment cost for adding an adapter to the telephone exchange facility is increased. Because the number conversion table is stored in each adapter, the data of all adapters must be changed each time the number of connection destinations increases. However, when connecting a plurality of telephone exchange devices, it takes a lot of time and labor for adapter maintenance (number conversion data), so it is not practical.

  Further, in the telephone exchange device described in Patent Document 2, dial information specifying a connection partner is transmitted after listening to a dial reception confirmation sound (pseudo dial tone) from the destination telephone exchange device. The PB signal had to be sent from the telephone on the caller side, which felt troublesome to operate.

  The present invention has been made in view of the above points. The object of the present invention is to make it easy to convert number conversion data to other telephone exchange devices within the own telephone exchange equipment without requiring an adapter as a new equipment. It is an object of the present invention to provide a telephone exchange device that can be managed and can automatically send dialed number information to a destination telephone exchange device.

In order to achieve the above object, the telephone exchange apparatus of the present invention accommodates a plurality of telephones, and in the telephone exchange apparatus connectable to the public network, stores the office number and the public subscriber number in association with each other. Number storage means and dial information including the office number from the telephone and the destination telephone number based on a call origination operation from the telephone are stored, and the office number included in the dial information is stored in the conversion number storage It is determined whether the establishment number is stored in the means, and if the establishment number is stored in the conversion number storage means, it corresponds to the establishment number stored in the conversion number storage means conversion means for the public subscriber number to convert the dialing information, if the dialing information has been converted by said converting means to said public network, conversion of by the converting means And transmission means for performing a call using the public subscriber number was, after the transmitting means has performed the outgoing, from the public network, the ready signal receiving means for receiving a virtual private line established ready signal, the When the preparation completion signal receiving means receives the virtual private line establishment preparation completion signal, a request signal transmission means for sending a request signal for requesting establishment of a speech path of the virtual private line to the public network, and the request signal after the transmitting unit has transmitted the request signal, from the public network, a response signal receiving means for receiving a response signal communication path establishment of the virtual private line, when the response signal reception unit receives the response signal, the Sending means for sending the called telephone number included in the stored dial information to the public network.
The telephone exchange device according to the present invention accommodates a plurality of telephones and receives caller ID information transmitted from the public network when the telephone exchange device is connectable to the public network when receiving from the public network. A caller number information receiving means, a response means for analyzing the caller number information and recognizing that it is a specific caller number information, an automatic response to the incoming call, and after the response means automatically responding, a ready signal transmitting means for transmitting a ready signal indicating that the a virtual private to the public network, after the ready completion signal transmission means transmits the ready signal, the virtual from the public network a request signal receiving means for receiving a request signal indicating the communication path establishment request dedicated line, receiving the request signal said request signal receiving means from said public network Then, the speech path probability of the virtual private line A response signal transmission means for transmitting a response signal, after the response signal transmitting means has transmitted the response signal, the connection destination information receiving means for receiving a called party telephone number indicating a phone according to the connection destination from the public network And an incoming call control means for causing the telephone set as the destination to receive a call based on the destination telephone number received by the connection destination information receiving means .

According to the telephone exchange apparatus of the present invention configured as described above, the telephone exchange apparatuses 101 and 201 according to the present invention use dial information based on a numbering plan for a dedicated line as a subscriber number for the public network 110. In addition to simply performing number conversion, it can send and receive signal information to and from the receiving side telephone exchange device, so that the designation information of the extension telephone to be connected can be transmitted to the calling side telephone exchange device. Can be sent automatically.
Further, as shown in FIG. 2, the number conversion table 106 according to the present invention includes a subscriber number as a destination and a business office number used in the leased line number plan (the local station incoming number of the telephone exchange device). Since it is managed by the calling side telephone exchange device, it is only necessary to manage only the station data of its own station without being influenced by the extension number plan change in the telephone exchange device that is the destination, The ease of maintenance of the telephone exchange device can be appealed.
In addition, even when only one of the calling side telephone exchange device and the incoming side telephone exchange device has the function according to the present invention, the other party telephone exchange device or the general subscriber telephone set as the connection destination is audible signal. Since it is automatically recognized that the sound is not supported, the dial operation can be performed without being aware of the function of the other party's telephone exchange device.
Furthermore, by recognizing incoming calls that are automatically answered using caller ID information, the total number of public network contracted lines can be determined according to traffic without dividing the public network used as an external line and the public network used as a virtual private line. It is possible to aggregate the number of contracts for public network lines.
Furthermore, when using the IP telephone network, many of them use a fixed amount charge or free of charge for calls within the same network instead of a pay-per-use charge, so the connection fee during the execution of the sequence according to the present invention is reduced. Since the processing can be performed without converting the call time and charged, the communication cost is reduced and the economic effect is increased.

  Hereinafter, a telephone exchange apparatus showing an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a telephone exchange apparatus showing an embodiment of the present invention. The telephone exchange device 101 and the telephone exchange device 201 have the same configuration. For convenience of explanation, the telephone exchange device 101 and the telephone exchange device 102 are connected to each other via the public network 110.

  Each of the telephone exchange devices 101 will be described as an outgoing side telephone exchange device, and the telephone exchange device 201 will be described as an incoming side telephone exchange device. However, either telephone exchange device may be an outgoing side or incoming side telephone exchange device. Needless to say.

  First, the configuration of the telephone exchange device will be described. In the telephone exchange apparatus 101 shown in FIG. 1, a telephone set 102 serving as an extension telephone is connected via an extension circuit 103. The extension circuit 103 accommodates, in the telephone exchange device 101, packages having different interfaces depending on the type of the telephone set 102 connected to the telephone exchange device.

  There are various types of telephones 102 to be connected, such as a multi-function telephone (not shown) and a 2W telephone (not shown) used in general homes. In the embodiment of the present invention, dial information can be transmitted. The telephone is not limited to the type of telephone as long as it is a simple telephone.

  The office line trunk 104 is an interface for connecting to the public network 110 and is a package accommodated in the telephone exchange device 101. In the embodiment of the present invention, one office line trunk 104 is described, but if a plurality of office line trunks 104 are similarly accommodated, it is possible to connect to a plurality of public network lines.

  The switch 109 is a communication path switch, and is connected to communication facilities such as the extension circuit 103 and the office trunk 104, and includes each telephone line 102 and other extension telephones or the public network 110 by forming respective communication paths. Make a connection and communicate.

  The telephone exchange device 101 also includes a control unit 105, a number conversion table 106, an audible sound signal sending unit 107, and an audible sound signal receiving unit 108 via a control bus (not shown). The control unit 105 is a CPU that controls the switch 109 described above. The number conversion table 106 is a so-called storage device (memory), and describes the number conversion table used in the embodiment of the present invention. Needless to say, this storage device includes not only the number conversion table but also a program for controlling the entire telephone exchange device, station data, and a temporary memory used when performing call control.

  The audible sound signal sending unit 107 performs control for generating an audible sound (special signal) used in the embodiment of the present invention.

  The audible sound signal receiving unit 108 performs control for receiving the audible sound used in the embodiment of the present invention.

A telephone switching apparatus 201 serving as a receiving side telephone switching apparatus has the same configuration as the telephone switching apparatus 101 described above. The telephone 202 is the telephone 101, the extension circuit 203 is the extension circuit 103, and the office trunk 204 is the office trunk. 104, switch 209, switch 109, control unit 205, control unit 105, number conversion table 206, number conversion table 106, audible sound signal sending unit 207, audible sound signal sending unit 107, and audible sound signal receiving unit. 208 performs the same control as the audible signal receiver 108.
FIG. 2 is an image diagram of the number conversion data in the embodiment of the present invention, and is stored as the number conversion table 106 of the telephone exchange device 101. The number conversion data shown in FIG. 2 includes an office number Z201 and a public subscriber number Z202.
As shown in FIG. 2, one public subscriber number Z202 corresponds to one establishment number Z201.
Hereinafter, as a first example of the embodiment of the present invention, an operation when a call is made from the telephone 102 to the telephone 202 will be described with reference to the sequence diagram of FIG.

  It is to be noted that the calling side telephone is set as telephone 102 and extension number 2000, the calling side telephone switching apparatus is set as telephone switching apparatus 101, the receiving side telephone switching apparatus is set as telephone switching apparatus 201, the receiving side telephone is set as telephone 202 and extension number 3000 is described. To do.

  In the following description, the private line access special number of the telephone exchange device 101 is “8” and the telephone exchange device access special number of the telephone exchange device 202 is “20”.

  First, when the telephone 102 is off-hooked (S310), the telephone exchange device 101 acquires off-hook information from the extension circuit 103 and sends a dial tone to the telephone 102. When the telephone 102 listens to the dial tone, the telephone 102 dials the telephone number to be connected. In the embodiment of the present invention, “8-20-3000” is dialed because the call originates from the telephone 202. As described above, this dial number is “dedicated line access special number + telephone exchange device access special number (incoming side telephone exchange device) + phone 202 extension number (incoming side telephone extension number)” (S311).

  When receiving the dial from the telephone 102, the telephone exchange device 101 stores the received dial information in the call processing temporary storage memory of the storage device, and searches the number conversion table 106 (S312). In the embodiment of the present invention, the above-mentioned telephone exchange device access special number is a search key. Since the number conversion data is composed of the office number Z201 and the public subscriber number Z202 as shown in FIG. 2, a search is performed using the telephone exchange device access special number “20”.

  When the telephone exchange apparatus 101 recognizes the business office number “20”, the telephone exchange apparatus 101 refers to the public subscriber number Z202 and determines whether there is correspondence data. Since “050-2345-6789” is stored in the public subscriber number Z202, it is determined that there is a correspondence (S313).

  Next, number conversion is performed using the stored public subscriber number Z202 (S314), the local trunk 104 is captured, and the public subscriber number Z202 “050-2345-6789” that has undergone number conversion is used. Then, the transmission is made to the public network 110 (S315). The public network 110 performs incoming processing to the telephone exchange device 201 based on the dial information “050-2345-6789” in order to perform normal connection processing as a call from the telephone exchange device 101 (S316, S317).

  The telephone exchange device 201 automatically responds to an incoming call from the public network 110 (S318). At this time, a response signal is sent back to the public network 110. However, when using an Internet telephone or the like, a service such as a flat rate charge or free call charge (only within the same communication carrier) can be used. For example, communication charges are not added as in the time difference method according to distance.

For the automatic response in the telephone exchange device 201, caller ID information transmitted from the public network 110 may be used. In short, not all the office line trunks accommodated in the telephone exchange device 201 automatically answer. In such a case, incoming calls that are automatically answered using caller ID information may be classified.
For example, it is set as station data of the telephone exchange device 201, and the station data is referred to when an incoming call is received. If there is a registration, an automatic response is performed, and if there is no registration, an automatic response is not performed.

  In addition, if it is possible to use the station trunk 204 as a connection line fixedly (when all incoming calls to the station trunk 204 are incoming calls that automatically answer), whether or not to answer automatically for each line. Alternatively, it may be set as station data.

  In response to a response from the telephone exchange device 201, the public network 110 connects the communication path between the telephone exchange device 101 and the telephone exchange device 201 (S319).

  After transmitting the response signal, the telephone exchange device 201 uses the audible sound signal transmitting unit 207 to transmit an audible sound signal indicating that the virtual private line establishment request signal reception preparation is completed (hereinafter referred to as a preparation completion signal) (S320). , S321).

  When receiving the audible sound signal, the telephone exchange device 101 uses the audible sound signal receiving unit 108 to recognize that the received audible sound signal is a preparation signal. An audible sound signal indicating an establishment request signal (hereinafter referred to as a request signal) is transmitted (S322, S323).

  When the telephone exchange apparatus 201 receives the audible sound signal and uses the audible sound signal receiving unit 208 to recognize that the received audible sound signal is a request signal, it establishes a virtual dedicated line using the audible sound signal sending unit 207. A response signal (hereinafter referred to as a response signal) is transmitted (S324, S325).

  When the telephone exchange device 101 receives the audible signal and uses the audible sound signal receiving unit 108 to recognize that the received audible sound signal is a response signal, the telephone exchange device 101 receives the extension number of the receiving side telephone (stored in the temporary memory). In the embodiment, “3000”) is extracted, and a PB signal is transmitted as a partner designation signal (S326, S327). In this way, the dial information is transmitted, but the communication path between the telephone exchange device 101 and the telephone exchange device 201 remains connected (S328).

Upon receiving the dial information received as the destination designation signal, the telephone exchange device 201 executes normal extension call processing (S329), starts ringing for the telephone 202 (S330), A ring tone is sent to the telephone 102 connected to (S331).
The telephone exchange device 201 determines that the telephone 202 has responded when the telephone 202 is off-hooked (S332), and the telephone path is already connected (S333). It becomes.

  FIG. 4 is a sequence diagram in the case where there is no corresponding data of the number conversion data when a call is made from the telephone 102. The operation sequence up to step S411 shown in FIG. 4 is not different from the operation up to steps S310 to S313 shown in FIG. When the telephone exchange apparatus 101 receives the dial information and determines that there is no number conversion data in the number conversion table, a restriction sound (BT (busy tone) in the present embodiment) is transmitted to the telephone 102 (S410).

  FIG. 5 is an operation sequence diagram when the telephone set 202 is busy when a call is made from the telephone set 102 to the telephone set 202. The operation sequence up to the establishment of the communication path up to step S512 shown in FIG. 5 is the same as the operation up to steps S310 to S328 shown in FIG.

  When the telephone exchange device 201 receives the dial information and executes the extension call processing, and recognizes that the telephone 202 is busy, the telephone switching apparatus 201 connects the communication path as it is to the telephone 102 so that a busy tone (ROT (relay)) can be obtained. Order tone)) can be heard (S510, S511).

  FIG. 6 is an operation sequence diagram in a case where when a call is made from the telephone set 102 to the telephone set 202, the office line trunk cannot be supplemented due to a full blockage of the office line trunk (such as busy) or a connection failure. It is. The operation of the number conversion process before step S612 shown in the operation sequence diagram of FIG. 6 is the same as the number conversion process of steps S310 to S314 shown in FIG.

  When the telephone exchange apparatus 101 recognizes that the trunk trunk has failed to be captured, the telephone exchange apparatus 101 causes the telephone 102 to listen to a busy tone (S610).

  FIG. 7 is an operation sequence diagram when a call is made from the telephone 102 to the telephone 202 and the public network 110 is busy or a connection failure occurs. The operations from the acquisition of the station trunk 104 up to step S711 and before (converted) transmission of the other party number shown in the operation sequence diagram of FIG. 7 to the other party number transmission process up to steps S310 to S315 and S316 shown in FIG. The explanation is omitted because there is no change.

When the public network 110 receives dial information, which is a subscriber number, from the telephone exchange device 101, the public network 110 performs connection to the office trunk 204 of the telephone exchange device 202 that is the destination. At this time, if it is recognized that the office line trunk 204 is in use or cannot be connected due to a failure or the like, a busy tone is transmitted to the office line trunk of the telephone exchange device 101 (S710).
As processing of the public network 110, connection processing is performed for the received subscriber number, and the line cannot be connected due to the other party's talking or connection failure, so only a busy tone is sent to the caller. Therefore, there is no change from the conventional circuit switching process.

  FIG. 8 is an operation sequence diagram when the telephone set 101 is on-hooked (discarded during calling) while the telephone set 202 is being called when the telephone set 101 makes a call to the telephone set 202. The operation up to the extension call up to step S811 shown in the operation sequence diagram of FIG. 8 is the same as the extension call processing up to steps S310 to S329 shown in FIG.

  The telephone set 102 in a state where the communication path is established is listening to a ringing tone (RBT (ringback tone)). When the telephone set 102 goes on-hook in this state (S810), the telephone exchange device 101 When the disconnection information is acquired from the extension circuit 103 and recognized that the terminal 102 is on-hooked (disconnected) (S812), a disconnection signal is sent to the local trunk 104 (S813) The public network 110 receives the disconnection signal. Therefore, call processing is performed in the same manner as when a disconnection signal is received from a general call state, and thus a disconnection signal is sent to the telephone exchange device 201 (S814).

  When the telephone exchange device 201 receives the disconnection signal from the public network 110, it stops the extension call processing and stops ringing to the telephone 202 (S815).

  FIG. 9 shows a case where the telephone switch 201 serving as the receiving side telephone switch cannot perform the control shown in the present invention when the call is made from the telephone 101 (there is no function), or the connection destination is a general subscriber phone. It is an operation | movement sequence diagram which shows these connection operation | movements. The incoming operation up to step S919 shown in FIG. 9 is not different from the incoming operation shown in steps S310 to S317 shown in FIG.

  The telephone exchange device 101 performs number conversion using the stored public subscriber number Z202, captures the office trunk 104, and uses the public subscriber number Z202 “050-2345-6789” that has undergone number conversion. Thus, if a call is made to the public network 110, a response signal from the public network 110 is not received, and therefore a call path cannot be established.

  In this case, the timer is started using the internal timer in the telephone exchange device 101 (S910). The telephone exchange device 201 receives an incoming call from the public network 110 according to its own station data (S911). For example, dial-in incoming calls, relay console incoming calls, direct-in dial incoming calls, direct in-line incoming calls, distributed incoming calls, and the like. In the embodiment of the present invention, since there is no specification for incoming from the public network 110 (station line), any one of the above methods may be used to receive the incoming call to the telephone 202 (S912).

  When an incoming call is made to the telephone set 202, a ringing tone is sent from the public network 110, so that a ringing tone is sent to the local trunk 104 of the telephone exchange device 101 (S913).

  On the other hand, the telephone exchange device 101 monitors the expiration of the timer activated in step S910, and sets the communication path with the telephone 102 when the timer expires (S914) (S915). By setting the speech path in this way, a ringing tone is sent to the telephone 102 (S916), and processing similar to that for normal incoming calls is performed.

  When the telephone 202 makes a response (S917), the communication path between the telephone 102 and the telephone 202 is established (S918).

  Note that it is conceivable that the telephone set 202 expires after answering depending on the set time of the timer, but by setting the set time of the timer as variable and using the station data of the telephone exchange device 101, a practical timer value (for example, It can be changed to about 1 second).

  FIG. 10 shows a cause after sending a preparation signal at the receiving side telephone exchange device (for example, a failure of the audible sound signal transmission unit of the connected telephone exchange device, an error in receiving a signal sound due to a poor line condition of the public network 110, etc.) ) Is a sequence diagram illustrating an operation when the request signal cannot be received. The preparation signal transmission operation up to steps S1006 and S1007 shown in FIG. 10 is the same as the preparation signal transmission operation in steps S310 to S320 and S321 shown in FIG.

  When the telephone exchange device 201 sends a preparation signal, it starts a monitoring timer (S1008). This monitoring timer is a time for waiting for reception of the request signal. When the timer expires (S1009), the incoming call processing is performed according to the station data of the telephone exchange device 201. In the embodiment of the present invention, for example, a representative extension call is made (S1010). In this case, when the request signal cannot be received, the destination extension telephone is determined by setting the destination telephone as station data in advance.

A ringing tone is sent to the public network 110 (S1012), and the destination extension telephone rings in the telephone exchange device 201. When the telephone 202 responds (S1013), the communication path between the telephone 102 and the telephone 202 is established.
Next, as a second example of the embodiment of the present invention, an operation when a call is made from the telephone set 102 to the telephone set 202 will be described with reference to the sequence diagram of FIG. In FIG. 11, the same operations as those in FIG. 3 are described with the same reference numerals, and the same processing may be performed, and thus detailed description thereof is omitted.

  The difference between the operation sequence shown in FIG. 11 and the operation sequence shown in FIG. 3 is the setting of the timer shown in step S1110. Until the number conversion process is performed from the telephone exchange device 101 and the calling process is performed with respect to the public network 110, it is as described with reference to FIG. 3, but after executing the calling process, the monitoring timer is started (S1110). ). This monitoring timer is an automatic response waiting time of the telephone exchange device 201 serving as the incoming side telephone exchange device, and can be arbitrarily set as station data of the telephone exchange device 101.

  The telephone exchange device 101 sets a certain waiting time until the timer expires after the timer is started, and sends a request signal after the timer expires (S1111). The subsequent operation is the same as the operation shown in FIG. 3 as described above.

  With this configuration, it is not necessary to wait for the reception of the preparation signal, and the processing time in each telephone exchange device can be shortened. As a matter of course, when this second embodiment is used, an automatic response at the telephone exchange device 201 on the receiving side is assumed.

  In the embodiment of the present invention, the embodiment is described as the public network 110. However, as long as it is a communication network that can transmit an audible sound signal (for example, a PB signal), an analog network, a digital network, a dedicated network Obviously, it can be configured by various communication networks such as an IP telephone network using the VoIP function.

  As described above, the telephone exchange apparatuses 101 and 201 according to the present invention can change the dial information based on the numbering plan for the dedicated line to the subscriber number for the public network 110, and simply Not only number conversion but also transmission / reception of signal information to / from the receiving side telephone exchange device enables automatic transmission of the designation information of the extension telephone to be connected from the originating side telephone exchange device.

  Further, as shown in FIG. 2, the number conversion table 106 according to the present invention includes a subscriber number as a destination and a business office number used in the leased line number plan (the local station incoming number of the telephone exchange device). Since it is managed by the calling side telephone exchange device, it is only necessary to manage only the station data of its own station without being influenced by the extension number plan change in the telephone exchange device that is the destination, The ease of maintenance of the telephone exchange device can be appealed.

1 is an overall configuration diagram of an embodiment of a telephone exchange device according to the present invention. The image figure of one Embodiment of the number conversion table which concerns on this invention Sequence diagram of one embodiment of outgoing operation according to the present invention Sequence diagram of one embodiment of abnormal transmission operation according to the present invention FIG. 3 is a sequence diagram of an embodiment of the operation during busy of the destination telephone according to the present invention. Sequence diagram of one embodiment of busy operation according to the present invention Sequence diagram of one embodiment of busy operation according to the present invention Sequence diagram of one embodiment of an abandonment halfway operation according to the present invention Sequence diagram of one embodiment of signal transmission / reception disabled operation according to the present invention Sequence diagram of one embodiment of incoming call operation according to the present invention Sequence diagram of one embodiment of outgoing operation according to the present invention

Explanation of symbols

101, 201: Telephone switching apparatus 102, 202: Telephone 103, 203: Extension circuit 104, 204: Office trunk 105, 205: Control unit (central control unit (CPU))
106, 206: Number conversion table (storage device)
107, 207: Audible sound signal sending unit 108, 208: Audible sound signal receiving unit 109, 209: Speech path switch

Claims (2)

In a telephone exchange device that accommodates multiple telephones and can be connected to a public network,
Conversion number storage means for storing an office number and a public subscriber number in association with each other;
Stores dial information including the business office number and the called telephone number from the telephone based on a call operation from the telephone, and stores the business office number included in the dial information in the conversion number storage means. If the establishment number is stored in the conversion number storage means, the public subscriber number corresponding to the establishment number stored in the conversion number storage means is determined. Conversion means for converting dial information;
When the dial information is converted by the conversion means, a transmission means for making a call using the public subscriber number converted by the conversion means to the public network;
After the originating unit has performed the outgoing, from the public network, the ready signal receiving means for receiving a virtual private line established ready signal,
When the preparation completion signal receiving means receives the virtual private line establishment preparation completion signal, a request signal transmission means for transmitting a request signal for requesting establishment of a speech path of the virtual private line to the public network;
After the request signal transmitting unit transmits the request signal, a response signal receiving means from said public network, receiving a response signal communication path establishment of the virtual private line,
A telephone exchange comprising: a sending means for sending the receiving telephone number contained in the stored dial information to the public network when the response signal receiving means receives the response signal; apparatus. In a telephone exchange device that accommodates multiple telephones and can be connected to a public network,
Caller number information receiving means for receiving caller number information transmitted from the public network when receiving from the public network;
A response means for automatically responding to the incoming call upon analyzing the caller ID information and recognizing that it is specific caller ID information;
A preparation completion signal transmitting means for sending a preparation completion signal indicating a virtual private line to the public network after the response means has automatically responded ;
After the ready completion signal transmission means transmits the ready signal, the request signal receiving means for receiving a request signal indicating the communication path establishment request of the virtual private line from the public network,
Receiving the request signal receiving means said request signal from said public network Then, the response signal transmission means for transmitting a response signal communication path establishment of the virtual private line,
After the response signal transmitting means has transmitted the response signal, a connection destination information receiving means for receiving a called party telephone number indicating a phone according to the destination from the public network,
Telephone exchange apparatus being characterized in that example Bei and a reception control means for terminating the telephone device according to the destination based on the called party phone number the connection destination information receiving means receives.

Images