JP3583051B2 - Transit exchange and PBX relay connection method thereof - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transit exchange and a transit connection method thereof, and more particularly, to a transit exchange for transiting from a private branch exchange of another telephone company to an extension of a private branch exchange (PBX) via the transit exchange, and the PBX transit connection. About the method.
[0002]
[Prior art]
Conventionally, in this type of telephone connection system, an originating local exchange does not connect to a destination local exchange accommodating a PBX by a direct route, but connects a relay exchange from a communication network of another telephone operating company. In the case where a call is made to a PBX via a PBX via a telephone line and the call is received at the extension of the PBX, as shown in Japanese Patent Application Laid-Open No. 60-100860, the caller receives a call to the PBX according to the guidance after receiving a call to the called local exchange. Is pushed by the calling terminal, and the calling terminal presses a push button (PB: Push).
Button) signal.
[0003]
As described above, when the destination terminal is the PBX extension in the normal telephone service, the connection is performed as follows. First, a call is originated from the originating local exchange, and arrives at the destination local exchange via the transit exchange. The receiving local exchange is connected to the PBX, returns a response signal to the transit exchange, and is in the same state as during a call to be charged. Next, when the caller presses the extension number from the calling terminal in accordance with the voice guidance from the PBX, the calling terminal sends out a PB sound. In the PBX that receives the PB sound, the call arrives at the subscriber of the corresponding extension number.
[0004]
[Problems to be solved by the invention]
In the conventional method described above, a PB sound transmission device is required for each terminal on the calling side, and since the exchange from the calling signal to the response signal is performed between the local exchanges, the response signal is transmitted on the calling side. When the call is received by the local exchange, the state of the call is the same as that during a call, and even when the call is being charged, the dial for transmitting the PB sound according to the guidance from the PBX. A pressing operation is required, and there is a problem that economy and convenience are reduced.
An object of the present invention is to eliminate the need to provide a PB sound transmission device for each terminal on the calling side when connecting to a PBX extension via a transit exchange, and to provide a subscriber with a PB sound transmission after PBX connection. It is an object of the present invention to provide a transit exchange and a PBX transit connection method that can eliminate the need to press a dial.
[0005]
[Means for Solving the Problems]
The relay exchange according to the present invention includes a storage unit for receiving and storing dial information transmitted from the originating local exchange, a push button sound transmission device for transmitting a multi-frequency push button signal to the destination local exchange. An extension number holding memory for storing an extension number of a subscriber accommodated in a private branch exchange connected to a subscriber exchange on the receiving side, and a central processing unit for controlling each section of the transit exchange. The apparatus comprises: a subscriber attribute judging unit for judging from the dial information whether or not the attribute of the calling subscriber is a subscriber to which the virtual private network service is applied; When it is determined that the subscriber is a subscriber to which the private network service is applied, the service control node controlling the virtual private network service obtains selection information for the local exchange on the receiving side. A service control point to access the access control unit, and refer to the extension number holding memory to determine whether or not the extension number is stored. If the extension number is stored, read the extension number and press the push button corresponding to the extension number. And a push button sound transmission control unit for instructing a signal to be transmitted from the push button sound transmission device.
[0007]
The PBX relay connection method in the transit exchange according to the present invention determines whether or not the attribute of the originating subscriber is a subscriber to which the virtual private network service is applied, based on dial information transmitted from the subscriber exchange on the originating side. When it is determined that the subscriber attribute is a virtual private network service subscriber, this dial information is stored in a memory holding an extension number, and a service control node connected to the transit exchange and controlling the virtual private network service. To obtain the selection information to the local exchange on the receiving side, connect to the downstream exchange, complete this connection, read the extension number stored in the memory after responding, and send a push button signal corresponding to this extension number. The transmission is sent to a private branch exchange connected to the subscriber exchange on the receiving side, and the subscriber on the receiving side is connected to the subscriber on the originating side.
[0008]
According to the present invention, there is provided an extension number reception judging unit for judging an extension number of a PBX to a transit exchange, an extension number holding memory for storing the extension number, and a PB sound transmitting device for transmitting a PB sound corresponding to the extension number. If the caller presses "# + extension number" at the end of the dialed telephone number, the extension number is stored in the extension number holding memory and a response signal is received from the called local exchange. In addition, by transmitting a PB tone corresponding to the extension number held in the extension number holding memory, the necessity of providing a PB tone transmission device for each terminal is lost, and when connected to the PBX, the PBX tone is transmitted without guidance connection. Incoming call to the subscriber corresponding to the extension number within
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a first embodiment of the present invention will be described with reference to the drawings.
[0010]
Referring to FIG. 1, there is illustrated a switching system to which a first embodiment of the present invention is applied, a subscriber exchange 2 accommodating an originating subscriber 1, a PBX 4 accommodating an extension subscriber 3, and It is composed of a local exchange 5 connected to the PBX 4 and a relay exchange 6 for relaying the local exchange 2 and the local exchange 5. In this case, the local exchange 2 belongs to, for example, a communication network of another telephone operating company, and the originating subscriber 1 always goes through the transit exchange 6 in order to connect to the extension subscriber 3.
[0011]
The transit exchange 6 includes an incoming trunk (ICT) 61 that interfaces with a line from the local exchange 2, an outgoing trunk (OGT) 62 that interfaces with a line to the local exchange 5, and an originating side. A dial storage register 63 for receiving and storing dial information transmitted from the local exchange 2, a PB sound transmitting device 64 for transmitting a multi-frequency PB signal to a receiving side exchange, ICT 61, OGT 62, and dial storage register 63 And a telephone line switch 65 accommodating the PB sound transmission device 64, a storage unit (not shown) for a program for controlling the entire transit exchange, and an extension subscription accommodated in the PBX 4 connected to the local exchange 5 on the receiving side. Extension number holding memory 661 for storing the extension number of party 3 It includes a main memory 66 comprising, a central processing unit 67 for controlling the program reading the transit exchange each unit from the main memory 66.
[0012]
The central processing unit 67 identifies the extension number from the dial information received from the local exchange 2, stores the extension number in the extension number holding memory 661, completes the connection with the local exchange 5 on the receiving side, reads out the response, and reads it out. , And instructs the PB sound transmission device 64 to transmit a PB signal corresponding to the extension number. The dial information stored in the dial storage register 63 is read out and the extension number is included in the information. And if it is determined that an extension number is included, an extension number reception determining unit 671 for storing the extension number in the extension number holding memory 661, and a transmission and reception unit for editing the number information obtained by removing the extension number from the dial information. It refers to the number editing unit 672 and the extension number holding memory 661 to determine whether or not the extension number is stored. The PB signal corresponding to the extension number reads No. and a PB tone sending control unit 673 that instructs to deliver the PB sound delivery device 64.
[0013]
FIG. 2 is a flowchart showing the flow of processing in the transit exchange of the present invention. The operation will be described below with reference to FIGS.
[0014]
In FIG. 1, when a calling subscriber 1 makes a call, a calling signal arrives at the ICT 61 to activate the transit exchange 6 from the calling local exchange 2. In this case, the calling signal includes the subscriber's telephone number on the receiving side and an identification code indicating the PBX extension number, for example, # and the extension number. The transit exchange 6 stores the dial number in the call signal in the dial storage register 63 in response to the reception of the call signal to the ICT 61. The extension number reception judging section 671 reads the dial number stored in the dial storage register 63 (Step 1: abbreviated as S1, hereinafter the same).
[0015]
The extension number reception determining unit 671 checks the dial number one digit at a time (S2, S3), determines whether or not # exists to the Nth digit (S4). The number is stored in the extension number holding memory 661 in the main storage device 66 (S5). If there is no # in the dial number read from the dial storage register 63 and there is no number in this register, the process ends (S6).
[0016]
On the other hand, the sending destination number editing unit 672 refers to the extension number holding memory 661 (S11) and determines whether or not an extension number exists (S12). Then, it is determined whether or not # exists in the N-th digit (S13 to S15). If # exists, the extension numbers after # are deleted (S16), and the subscription not including this extension number is performed. A calling signal including the subscriber telephone number is sent to the subscriber exchange 5 on the receiving side via OGT 62. This is to prevent a PB tone from being transmitted from a plurality of exchanges on a relay tier when a call passes through two or more relay exchanges.
[0017]
When this calling signal is transmitted to the receiving local exchange 5 and the response signal is received and returned to the originating local exchange 2, the transit exchange 6 triggers the PB sound transmission control unit. 673 refers to the extension number holding memory 661 (S21) and determines whether or not there is an extension number (S22). If an extension number exists, the extension number stored in the extension number holding memory 661 is read, and a command is issued to the PB sound transmitting device 64 to transmit the PB sound corresponding to the extension number (S23). A PB sound is transmitted to the PBX 4 on the receiving side via the switch 65. Thereafter, a response signal is returned to the originating local exchange 2.
[0018]
If the PBX incoming call is realized by the above-described procedure, the PB tone transmitting device may be provided only in the transit exchange, not in each calling terminal, and the incoming call is made to the extension subscriber in the PBX without the guidance connection from the PBX. It becomes possible.
[0019]
Next, a second embodiment of the present invention will be described with reference to the drawings. In the above-described first embodiment, a normal PBX incoming call has been described as an example. However, a PBX incoming call in an intelligent network service via a service control node functioning as a service control point (SCP) and a transit exchange is provided. Can also be realized.
[0020]
One example is a VPN (Virtual Private Network) service. With the VPN service, a virtual extension number is assigned to a normal telephone terminal, the data is held by the service control node, the telephone number of the called subscriber corresponding to the extension number is notified to the transit exchange, and the incoming call can be received. This is a service that provides a virtual network that allows telephone calls in the extension number format.
[0021]
FIG. 3 (a) is a diagram showing a switching system to which the second embodiment of the present invention is applied, in which a subscriber exchange 2 accommodating an originating subscriber 1, a PBX 4 accommodating an extension subscriber 3, and It is composed of a local exchange 5 connected to the PBX 4, a local exchange 6 for relaying the local exchange 2 and the local exchange 5, and a service control node 7 connected to the local exchange 6. In this case, the local exchange 2 belongs to, for example, a communication network of another telephone operating company, and the originating subscriber 1 always goes through the transit exchange 6 in order to connect to the extension subscriber 3.
[0022]
FIG. 3B is a diagram illustrating a configuration example of the relay exchange 6 in FIG. In (b), those having the same reference numerals as those described in the first embodiment have the same functions, and thus description thereof will be omitted. The central processing unit 68 determines whether or not the attribute of the calling subscriber is a subscriber to whom the virtual private network service is to be applied, based on dial information transmitted from the local exchange 2 on the calling side. When the subscriber attribute judging unit 681 determines that the subscriber attribute is a subscriber to whom the virtual private network service is applied, the subscriber private attribute control unit 681 controls the virtual private network service in order to obtain selection information to the subscriber exchange 5 on the receiving side. And an SCP access control unit 682 that accesses the service control node 7.
[0023]
Hereinafter, the operation of the second embodiment will be described (flow chart is omitted). First, a call is originated from the local exchange 2 on the calling side, and the dial number in the extension number format is received by the dial storage register 63 of the transit exchange 6 and stored in the extension number holding memory 661. In the transit exchange 6, the subscriber attribute determining unit 681 refers to a correspondence table (not shown) registered in advance, and determines from the received information that the attribute of the originating subscriber is a VPN service subscriber. Then, the SCP access control unit 682 accesses the service control node 7 to obtain a subscriber telephone number for outgoing connection to the destination local exchange.
[0024]
The service control node 7 converts the extension number to the actual subscriber telephone number using a conversion table (not shown) registered in advance, determines that the destination is a PBX, and sends the PB sound transmission to the transit exchange 6. To instruct. The transit exchange 6 determines the connection destination based on the received subscriber telephone number, and transmits a call signal including the subscriber telephone number to the subscriber exchange.
[0025]
On the other hand, when receiving the calling signal, the subscriber exchange 5 on the receiving side returns a response signal. In the transit exchange 6, triggered by the response signal from the PBX 4, the PB sound transmission control unit 673 transmits the PB sound corresponding to the extension number based on the PB sound transmission instructed by the service control node 7. Then, based on the PB sound, the call arrives at the extension subscriber 3 in the PBX.
[0026]
【The invention's effect】
As described above, according to the present invention, the extension number of the subscriber accommodated in the private branch exchange connected to the called local exchange is identified by the transit exchange based on the dial information received from the originating local exchange. By storing the information, connecting to the called subscriber exchange and sending the extension number to the private branch exchange by a push button signal from the transit exchange after responding, the called subscriber and the calling subscriber are connected. Therefore, it is not necessary to hold a PB transmission device for each terminal, and the PBX sound transmission operation according to the guidance is not performed after the call is in the same state as during a call, and the PBX can be subscribed within the PBX. Incoming call to the person.
[Brief description of the drawings]
FIG. 1A is a diagram showing an exchange system to which a first embodiment of the present invention is applied. (B) is a figure which shows the example of a structure of the transit exchange in (a).
FIG. 2 is a flowchart illustrating a processing flow in the transit exchange according to the first embodiment of this invention.
FIG. 3A is a diagram showing a switching system to which a second embodiment of the present invention is applied. (B) is a figure which shows the example of a structure of the transit exchange in (a).
[Explanation of symbols]
1 originating subscriber 2, 5 subscriber exchange 3 extension subscriber 4 PBX
6 Transit exchange 7 Service control node 61 ICT
62 OGT
63 Dial storage register 64 PB sound transmission device 65 Communication path switch 66 Main storage device 67, 68 Central processing unit 661 Extension number holding memory 672 Transmission / reception number editing unit 673 PB sound transmission control unit 681 Subscriber attribute judgment unit 682 SCP access control Department

Claims (2)

A storage unit for receiving and storing dial information sent from the originating local exchange, a push button sound transmitting device for transmitting a multi-frequency push button signal to the destination local exchange, and a destination local exchange An extension number holding memory for storing an extension number of a subscriber accommodated in the private branch exchange connected to the private branch exchange, and a central processing unit for controlling each part of the transit exchange. A subscriber attribute judging unit for judging whether or not the attribute is a subscriber to which the virtual private network service is applied, based on the dial information; When it is determined that there is a service control service for accessing a service control node controlling a virtual private network service in order to obtain selection information for the local exchange on the receiving side. The point access control unit and the extension number holding memory are referred to to determine whether or not the extension number is stored. If the extension number is stored, the extension number is read and the push button signal corresponding to the extension number is pushed. And a push button sound transmission control unit for instructing transmission from the button sound transmission device. Whether the attribute of the calling subscriber is a subscriber to whom the virtual private network service is applied or not is determined based on dial information sent from the calling local exchange, and the subscriber attribute is a virtual private network service subscriber. When it is determined that this is the case, the dial information is stored in the memory holding the extension number, and a service control node connected to the transit exchange and controlling the virtual private network service is accessed to select the subscriber exchange on the receiving side. It obtains information, connects to the downstream exchange, completes this connection, reads out the extension number stored in the memory after responding, and sends a push button signal corresponding to this extension number to the called local exchange. A PBX relay connection method in a transit exchange, wherein the PBX relay connection is transmitted to a private branch exchange and connects a called side subscriber and a calling side subscriber.

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