JP2003174658A - Private branch exchange - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a private branch exchange that can flexibly be compatible with and connected to various digital communication networks. <P>SOLUTION: A storage section 15 of a master unit 1 is provided with a subscriber number table 151 where a subscriber number and a TEI (Terminal Endpoint Identifier) are cross-referenced one-to-one with each other and a TEI cross-reference index table 152, a control section 14 is provided with an incoming call number analysis section 141 and a TEI analysis section 142, and when the master unit 1 receives an incoming call signal addressed itself from an ISDN 3, the incoming call number analysis section 141 analyzes a subscriber number included in the incoming call signal, the TEI analysis section 142 reads the TEI corresponding to the subscriber number analyzed by the incoming call number analysis section 141 from the TEI cross-reference index table 152 and uses the TEI to implement communication control of message and service execution control with respect to the ISDN 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to ISDN, for example.
The present invention relates to a private branch exchange device capable of connecting a digital communication network such as a network.

[0002]

2. Description of the Related Art Private branch exchanges have been widely used in office buildings and offices. This type of private branch exchange apparatus accommodates, for example, a telephone as an extension terminal, and makes a telephone call by exchanging connection between the extension terminal and an external communication network such as a public network and between the extension terminals. Moreover, the ISDN network is also included as the external communication network.

By the way, in the above private branch exchange, ISD
When connected to the N network, after establishing the layer 1 at the time of starting the own device, the termination point identifier (TEI:
Request the allocation of the Terminal Endpoint Identifier). Then, when the TEI is assigned from the ISDN network, a layer 2 data link is established between the ISDN network and the private branch exchange, and a transition is made to a communicable state.

Further, in the above private branch exchange, when a basic interface (BRI: Basic Rate interface) is accommodated, it is necessary to allocate a plurality of TEIs to one line in order to simultaneously control a plurality of calls depending on the ISDN network. Therefore, when communicating with the ISDN network, a TEI that is normally idle is selected and a message is transmitted using this TEI.

[0005]

However, in some parts of the ISDN network, the subscriber number and the TEI are established after the data link is established.
There is also a one-to-one relationship between and,
When the private branch exchange apparatus sends a message to the ISDN network using the selected TEI when it has two TEIs on the same line, the TEI becomes the ISDN.
When it is different from the one associated with the subscriber number on the network side,
Communication will be refused.

Therefore, an object of the present invention is to provide a private branch exchange capable of flexibly coping with connection to various digital communication networks.

[0007]

A private branch exchange according to the present invention is configured as follows in order to achieve the above object.

(1) In a private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected at their respective terminations, from the digital communication network to each communication channel In the case where the storage means storing the termination point identifier used for transmitting and receiving the message on the digital communication network in association with the assigned subscriber information and the request for executing the service relating to the exchange arrives from the digital communication network. , Referring to the termination point identifier corresponding to the subscriber information included in the execution request from the storage means, transmitting / receiving a message to / from a digital communication network based on the reference result, and executing a service based on the transmitted / received message And a service execution control means for performing the operation.

According to the invention of the above (1), since the termination point identifier is fixedly prepared for each subscriber information, the subscriber information and the termination point identifier are managed in a one-to-one correspondence. Even when connected to an existing digital communication network, it is possible to always send and receive a message using the termination point identifier expected by the digital communication network side, and it is possible to prevent the communication from being rejected by the digital communication network.

Further, since the termination point identifier is fixedly prepared for each subscriber information, even when a plurality of exchange service execution requests are issued in the same time zone, transfer of messages relating to these exchange services is performed. This can be done in parallel, which allows the plurality of exchange service controls to be efficiently executed.

(2) In a private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected at their respective terminations, from the digital communication network to each communication channel. In the case where the storage means storing the termination point identifier used for transmitting and receiving the message on the digital communication network in association with the assigned subscriber information and the request for executing the service relating to the exchange arrives from the digital communication network. , Referring to the termination point identifier corresponding to the subscriber information included in the execution request from the storage means, transmitting / receiving a message to / from a digital communication network based on the reference result, and executing a service based on the transmitted / received message The first service execution control means and the execution request for the service related to the exchange come from the digital communication network. In this case, a vacant termination point identifier is selected from a plurality of termination point identifiers, a message is transmitted / received to / from the digital communication network based on the termination point identifier, and a service is provided based on this transmitted / received message. A second service execution control means to be executed and a selection control means to selectively execute the first and second service execution control means according to a designation operation from the outside are provided.

According to the invention of the above (2), for example, when connected to a digital communication network that manages subscriber information and termination point identifiers in a one-to-one correspondence, the subscriber information is fixed to the subscriber information. The message is sent and received using the termination point identifier that is associated with each other, and when the message is connected to another digital communication network, the message is transmitted using the vacant termination point identifier from the plurality of termination point identifiers. It is possible to execute optimum exchange service control for each digital communication network, such as sending and receiving.

(3) In a private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected at their respective terminations, from the digital communication network to each communication channel Storage means for storing termination point identifiers used for transmitting and receiving messages on the digital communication network in association with the assigned subscriber information, and request for execution of services related to exchange using the digital communication network from extension terminals When an error occurs, a vacant termination point identifier is selected from the plurality of termination point identifiers stored in the storage means, and based on the subscriber information corresponding to the selected termination point identifier, the communication with the digital communication network is performed. And a service execution control means for executing a service based on the transmitted and received messages. Those were Unishi.

According to the invention of the above (3), even when a call is made from the extension terminal to the digital communication network side, the same operational effect as the invention of the above (1) can be obtained.

(4) In a private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected at their respective ends, from the digital communication network to each communication channel Storage means for storing termination point identifiers used for transmitting and receiving messages on the digital communication network in association with the assigned subscriber information, and request for execution of services related to exchange using the digital communication network from extension terminals When an error occurs, a vacant termination point identifier is selected from the plurality of termination point identifiers stored in the storage means, and based on the subscriber information corresponding to the selected termination point identifier, the communication with the digital communication network is performed. First service execution control means for transmitting and receiving a message between the two and executing a service based on the transmitted and received message; and an extension When a request to execute a service relating to exchange using the digital communication network is made from the end, a vacant end point identifier is selected from a plurality of end point identifiers stored in the storage means, and a plurality of subscriber information Selects vacant subscriber information from the inside, transmits / receives a message to / from a digital communication network based on the selected termination point identifier and subscriber information, and executes a service based on the transmitted / received message. The first and second service execution control means, and the first and the second according to a designation operation from the outside.
And a selection control means for selectively executing the service execution control means.

According to the invention of the above (4), the same effect as the invention of the above (2) can be obtained even when a call is made from the extension terminal to the digital communication network side.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing a configuration of a first embodiment of a switching system according to the present invention.

In the exchange system, as shown in the figure, the main unit 1 is provided with a plurality (maximum i) of extension terminals 2 (2-1 to 2-).
i) is arbitrarily connected.

The main device 1 further includes a time switch 1
1, an ISDN interface circuit 12, a plurality (i) of extension interface circuits 13 (13-1 to 13-i),
The control unit 14, the storage unit 15, and the data highway interface unit 16 are provided, and the time switch 11 and the IS
The DN interface circuit 12 and the extension interface circuit 13 are connected to each other via the PCM highway 17.

Further, the ISDN interface circuit 12,
The extension interface circuit 13 and the data highway interface section 16 are connected to each other via a data highway 18. Furthermore, the control unit 14 and the storage unit 15
And the data highway interface unit 16 is a CPU
They are connected to each other via a bus 19. The time switch 11 is directly connected to the control unit 14.

The time switch 11 switches the time slots on the PCM highway 17 under the control of the control unit 14 to arbitrarily connect the ISDN interface circuit 12 and the extension interface circuit 13 by exchange.

The ISDN interface circuit 12 has an I
The SDN network 3 is connected as needed. The ISDN interface circuit 12 performs an interface operation regarding the connected ISDN. The ISDN interface circuit 12 exchanges various control information relating to the interface operation with the control unit 14 via the data highway 18, the data highway interface unit 16 and the CPU bus 19.

The extension terminal 2 is connected to the extension interface circuit 13 as required. The extension interface circuit 13 performs an extension interface operation regarding the connected extension terminal 2. The extension interface operation is performed by the PCM highway 1 of the PCM signal output from the extension terminal 2.
7, the state monitoring of the extension terminal 2 and the sending of various signals to the extension terminal 2. The extension interface circuit 13 sends and receives various control information relating to the extension interface operation to the data highway 18,
This is performed with the control unit 14 via the data highway interface unit 16 and the CPU bus 19.

The control unit 14 performs processing based on the operation program stored in the storage unit 15 to collectively control the time switch 11, the ISDN interface circuit 12, and the extension interface circuit 13, respectively.
The operation as the main device 1 is realized.

The storage unit 15 stores the operation program of the control unit 14 and various other permanently used data.

Data highway interface section 16
Exchanges data between the data highway 18 and the CPU bus 19.

The control unit 14 of this embodiment is provided with a called number analysis unit 141, a TEI analysis unit 142, and a calling number setting unit 143. Further, the storage unit 15
Includes a subscriber number table 151 and a TEI corresponding index table 152.

As shown in FIG. 2, the subscriber number table 151 stores data representing the correspondence between the subscriber number assigned from the ISDN network 3 for each speech channel (B channel) and the index. There is.

As shown in FIG. 3, the TEI correspondence index table 152 stores data representing the correspondence between indexes and TEIs.

When an incoming signal addressed to the own device arrives from the ISDN network 3, the called number analyzing section 141 analyzes the subscriber number included in the incoming signal.

The TEI analysis unit 142 reads the index corresponding to the subscriber number analyzed by the called number analysis unit 141 from the subscriber number table 151, and the TEI corresponding to the read index from the TEI correspondence index table 152. Read out and use this TEI to control message communication and service execution to the ISDN network 3. From the extension terminal 2 I
When a call is made to the SDN network 3, an empty TEI is selected from the TEI corresponding index table 152.

The calling party number setting unit 143 receives the I number from the extension terminal 2.
When a call is made to the SDN network 3, the subscriber number corresponding to the TEI selected by the TEI analysis unit 142 is read from the subscriber number table 151, and the communication control of the message is performed using this subscriber number. To do.

Next, the operation of the system configured as described above will be described.

(Incoming Call Operation) For example, as shown in FIG.
It is assumed that a call setup message (SETUP) for the extension terminal 2-2 arrives from the SDN network 3. Then, main device 1 receives the called number (9495) included in the call setup message.
831200), the incoming data is transferred to the corresponding extension terminal 2-2 to notify the incoming call, and the TEI (65) corresponding to the called number is read from the TEI corresponding index table 152 and read. A call setup acceptance message (CALL PROC) is transmitted to the ISDN network 3 using the TEI.

Thus, the extension terminal 2-2 responds to the incoming call notification.
Responds, the extension terminal 2-2 is connected to the other terminal on the ISDN network 3 side, and voice communication can be performed.

During the above operation, the controller 14 of the main unit 1
The control process as shown in FIG. 5 is started.

When this control processing is started, the control unit 14 first determines whether or not there is an incoming call from the ISDN network 3 (step ST5a). Then, if the incoming call is other than the ISDN network 3, the control unit 14 shifts to a normal incoming call control process such as switching connection of an analog office line.

On the other hand, if the incoming call is from the ISDN network 3, the control unit 14 analyzes the called number (step ST5b), and the TEI corresponding to the analyzed called number is read from the TEI correspondence index table 152. Read out (step ST5c). At this time, the control unit 14 determines whether or not the read TEI is in use (step ST5d).

As a result of the above judgment, if the TEI is in use, the control unit 14 notifies the terminal on the ISDN network 3 side, which is the transmission source, that communication is impossible.

On the other hand, if the TEI is empty, the control unit 14 uses the TEI to send a call setting acceptance message to the ISDN network 3 (step ST5).
e).

(Calling operation to ISDN network) For example, as shown in FIG. 6, it is assumed that the extension terminal 2-1 designates the ISDN network 3 and makes a call to the ISDN network 3. Then, the main device 1 receives the TEI-compatible index table 15
2. Select a vacant TEI from the TEIs stored in No. 2, read the subscriber number corresponding to the selected TEI from the subscriber number table 151, and use the read subscriber number and TEI. A call setup message is transmitted to the ISDN network 3.

Thus, the extension terminal 2-1 and the ISDN network 3
The other party's terminal on the side is connected and voice communication can be performed.

During the above operation, the control unit 14 of the main unit 1
The control process as shown in FIG. 7 is started.

When this control process is started, the control unit 14 first determines whether or not there is an incoming call to the ISDN network 3 (step ST7a). Then, if the call is to a source other than the ISDN network 3, the control unit 14 shifts to a normal call control process such as switching connection of an analog station line.

On the other hand, if the call is to the ISDN network 3, the control unit 14 determines that the TEI corresponding index table 1
The empty TEI is read from 52 (step ST7b). At this time, the control unit 14 determines whether or not there is an empty TEI (step ST7).
c).

As a result of the above determination, the TEI in the empty state is
If there is not, the control unit 14 notifies the extension terminal 2-1 which is the transmission source that communication is impossible.

On the other hand, if there is an empty TEI, the control unit 14 reads the subscriber number corresponding to the TEI from the subscriber number table 151 (step ST7).
d), using the subscriber number and TEI, send a call setup message to the ISDN network 3 (step ST
7e).

As described above, in the first embodiment, the storage unit 15 of the main unit 1 has a one-to-one correspondence between the subscriber number and the TEI.
A subscriber number table 151 and a TEI correspondence index table 152 which are associated with each other, and a control unit 14 is provided with a called number analysis unit 141, a TEI analysis unit 142, and a calling number setting unit 143. When an incoming signal arrives, the subscriber number included in the incoming signal is analyzed by the called number analysis unit 141, the TEI corresponding to the analyzed subscriber number is read from the TEI correspondence index table 152, and this TEI is used. Then IS
Message communication control and service execution control for the DN network 3 are performed.

When a call is made from the extension terminal 2 to the ISDN network 3, the TEI analysis unit 142 causes the TE
Free TE from the I-compatible index table 152
I is selected, the calling party number corresponding to the TEI is read from the calling party number table 151 by the calling party number setting unit 143, and the communication control of the message is performed using this calling party number.

Therefore, even if the subscriber is connected to the digital communication network 3 that manages the subscriber number and the TEI in a one-to-one correspondence, the message is always sent using the TEI expected by the digital communication network 3 side. It becomes possible to transmit and receive, and thereby it is possible to prevent the communication from being rejected by the digital communication network 3.

Further, in the above embodiment, since the TEI is fixedly prepared for each subscriber number, even if a plurality of exchange service execution requests are issued in the same time zone, messages relating to these exchange services are provided. Can be carried out in parallel, whereby the plurality of exchange service controls can be efficiently executed.

(Second Embodiment) FIG. 8 is a block diagram showing the configuration of a second embodiment of the exchange system according to the present invention. In FIG. 8, the same parts as those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted.

That is, in the second embodiment, the changeover switch 20 is provided on the CPU bus 19, and the message transmitting / receiving unit 144 is provided in the control unit 14.

The changeover switch 20 allows the user or maintenance worker to set the operation mode of the control unit 14 to the first operation mode in which the subscriber number and the TEI are associated with each other on a one-to-one basis, and the subscriber number and the TEI to one. It is a switch for setting any of the second operation modes not associated with the pair 1.

The message transmission / reception unit 144, when the second operation mode is set, when the execution request of the service relating to the exchange using the ISDN network 3 is issued, the TEI corresponding index table 152 is in the empty state.
Is selected, a message is transmitted / received to / from the ISDN network 3 using the TEI, and service control is performed based on the transmitted / received message.

Next, the operation of the system configured as described above will be described.

When an incoming call from the ISDN network 3 arrives, the control unit 14 starts the control process as shown in FIG.

When this control processing is started, the control section 14 first determines whether or not there is an incoming call from the ISDN network 3 (step ST9a). Then, if the incoming call is other than the ISDN network 3, the control unit 14 shifts to a normal incoming call control process such as switching connection of an analog office line.

On the other hand, if the incoming call is from the ISDN network 3, the control unit 14 confirms the state of the changeover switch 20 and determines the operation mode (step ST9b).

Then, if the first operation mode is set, the control unit 14 sets the TEI corresponding to the called number to TE.
It is read from the I corresponding index table 152 (step ST9c), and a call setting acceptance message is transmitted to the ISDN network 3 using the TEI (step ST9c).
9d).

On the other hand, if the second operation mode is set, the control unit 14 reads the TEI in the empty state from the TEI corresponding index table 152 (step ST9e), and uses the TEI to ISDN.
A call setting acceptance message is transmitted to the network 3 (step ST9f).

The same operation procedure as above is executed when the call is made to the ISDN network 3.

As described above, according to the second embodiment, for example, when the subscriber number is connected to the ISDN network 3 that manages the TEI in a one-to-one correspondence, TEI correspondence index table 152 when a message is transmitted and received using the TEI fixedly associated with and is connected to another ISDN network 3.
Optimal exchange service control can be executed for each ISDN network 3, such that a message is transmitted / received by using a vacant TEI among a plurality of TEIs stored and managed.

(Other Embodiments) In each of the above embodiments, ISDN is used as a digital communication network connected to the main device.
Although the case where the network is used has been described as an example, a digital communication network other than the ISDN network may be used.

In the second embodiment, an example in which the changeover switch is used to selectively switch the first operation mode and the second operation mode has been described.
It may be automatically switched according to the time zone or the communication traffic state.

Furthermore, in each of the above embodiments, an example in which TEI is used for transmitting and receiving a message has been described.
An end point identifier other than EI may be used.

In addition to the above, the type and configuration of the main unit, the type of extension terminal, the control procedure and contents of the main unit when sending and receiving messages, the contents of TEI and subscriber information, etc. Various modifications can be made without departing from the scope.

[0069]

As described above in detail, according to the present invention,
It is possible to provide a private branch exchange device that can be flexibly connected to various digital communication networks.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a switching system according to the present invention.

2 is a diagram showing an example of stored contents of a subscriber number table shown in FIG.

FIG. 3 is a diagram showing an example of stored contents of a TEI corresponding index table shown in FIG.

FIG. 4 is a diagram for explaining an example of an incoming call processing operation in the system according to the first embodiment.

FIG. 5 is a flowchart showing a control procedure and control contents of an incoming call processing operation in the system according to the first embodiment.

FIG. 6 shows the IS in the system according to the first embodiment.
The figure for demonstrating an example of the transmission processing operation to a DN network.

FIG. 7 shows the IS in the system according to the first embodiment.
The flowchart which shows the control procedure and control content of the transmission processing operation | movement to DN network.

FIG. 8 is a block diagram showing a second embodiment of the exchange system according to the present invention.

FIG. 9 is a flowchart showing a control procedure and control contents of an incoming call processing operation in the system according to the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 2 (2-1 to 2-i) ... Extension terminal, 3 ... ISDN network, 11 ... Time switch, 12 ... ISDN interface circuit, 13 (13-1 to 13-i) ... Extension interface circuit, 14 ... Control part, 15 ... Storage part, 16 ... Data highway interface part, 17 ... PCM highway, 18 ... Data highway, 19 ... CPU bus, 20 ... Changeover switch, 141 ... Destination number analysis part, 142 ... TEI analysis part, 143 ... Calling number setting unit, 144 ... Message transmitting / receiving unit, 151 ... Subscriber number table, 152 ... TEI compatible index table.

Claims (5)

[Claims] 1. A private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected, and each of the communication channels from the digital communication network. Storage means for storing a termination point identifier used for transmitting and receiving a message on the digital communication network in association with the assigned subscriber information, and an execution request for a service related to exchange using the digital communication network are stored. When it occurs, it refers to the subscriber information and the termination point identifier to be used in response to the execution request from the storage means, transmits / receives a message to / from the digital communication network based on the reference result, and transmits / receives the message. And a service execution control means for executing the service based on the message. . 2. A private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected, and a communication channel for each communication channel from the digital communication network. Corresponding to the assigned subscriber information, storage means for storing a termination point identifier used for transmitting and receiving a message on the digital communication network, and a request to execute a service related to exchange have arrived from the digital communication network. In this case, the termination point identifier corresponding to the subscriber information included in the execution request is referred to from the storage means, a message is transmitted / received to / from the digital communication network based on the reference result, and the transmitted / received message is A private branch exchange comprising: a service execution control means for executing the service based on the service. 3. A private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected, and each of the communication channels from the digital communication network. Corresponding to the assigned subscriber information, storage means for storing a termination point identifier used for transmitting and receiving a message on the digital communication network, and a request to execute a service related to exchange have arrived from the digital communication network. In this case, the termination point identifier corresponding to the subscriber information included in the execution request is referred to from the storage means, a message is transmitted / received to / from the digital communication network based on the reference result, and the transmitted / received message is First service execution control means for executing the service based on the above, and a service for switching from the digital communication network. When a service execution request arrives, a free end point identifier is selected from the plurality of end point identifiers, and a message is transmitted / received to / from the digital communication network based on the end point identifier, Second service execution control means for executing the service based on the transmitted / received message, and selection control means for selectively executing the first and second service execution control means in response to a designation operation from the outside. A private branch exchange apparatus comprising: 4. A private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected, and each of the communication channels from the digital communication network. Storage means for storing termination point identifiers used for transmitting and receiving messages on the digital communication network in association with the assigned subscriber information, and a service relating to exchange from the extension terminal using the digital communication network When an execution request of is generated, a vacant termination point identifier is selected from the plurality of termination point identifiers stored in the storage means, and based on the subscriber information corresponding to the selected termination point identifier, the A service that transmits / receives a message to / from a digital communication network and executes the service based on the transmitted / received message. Private branch exchange apparatus characterized by comprising a control means. 5. A private branch exchange apparatus capable of connecting at least one digital communication network having a plurality of communication channels, each of which accommodates a plurality of extensions to which extension terminals can be connected, and a communication channel from the digital communication network is provided for each communication channel. Storage means for storing termination point identifiers used for transmitting and receiving messages on the digital communication network in association with the assigned subscriber information, and a service relating to exchange from the extension terminal using the digital communication network When an execution request of is generated, a vacant termination point identifier is selected from the plurality of termination point identifiers stored in the storage means, and based on the subscriber information corresponding to the selected termination point identifier, the A first server that transmits / receives a message to / from a digital communication network and executes the service based on the transmitted / received message. Execution control means and the extension terminal, when a request for execution of a service relating to the exchange using the digital communication network is made, a free end point identifier is selected from a plurality of end point identifiers stored in the storage means. Along with the selection, select vacant subscriber information from the plurality of subscriber information, and based on these selected termination point identifier and subscriber information, send and receive messages to and from the digital communication network, Second service execution control means for executing the service based on the transmitted / received message, and selection control means for selectively executing the first and second service execution control means in response to a designation operation from the outside. A private branch exchange apparatus comprising: