JPH0918595A - Private branch exchange - Google Patents

Abstract

PURPOSE: To securely make a connection in response to calling-back operation from a B board when a call is disconnected from the side of a digital telephone terminal. CONSTITUTION: When the digital telephone terminal 40 and the B board 30 are connected to each other, a digital interface control part 12 generates call control data including the terminal point identifier and reservation flag of the digital telephone terminal 40. When the call is disconnected from the digital telephone terminal 40 in this state, the reservation flag in the call control data is set to 'in reservation'. When one of digital telephone terminal 40 makes a call connection request, the digital interface control part 12 refers to the call control data and connects the digital telephone terminal 40 and the B board 30 together unconditionally on condition that the terminal point identifier of the digital telephone terminal 40 having made the call connection request matches and its reservation flat is set to 'in reservation'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange, and more particularly to call control of extension-connected digital telephone terminals.

[0002]

2. Description of the Related Art Today, an ISDN is connected to a station line side, a digital telephone terminal such as an analog telephone terminal or an ISDN telephone terminal, or a terminal such as a digital data terminal is connected to an extension side, and each terminal is exchanged with a station line. Also, a private branch exchange apparatus is used for exchanging terminals connected to each other by extension lines. Further, in such a private branch exchange, a relay stand is provided for performing a switching operation between a terminal connected to an extension line and an outside line and a call operation between terminals connected to an extension line. Is designed to operate.

[0003]

In the above private branch exchange, even if the analog telephone terminal is disconnected during a call with the terminal, the analog telephone terminal can be re-hooked with the relay stand by just off-hooking the analog telephone terminal. Can be connected.
That is, even if the analog telephone terminal accidentally goes on-hook during a call with the relay stand, it can be reconnected unless the call disconnecting operation is performed from the relay stand.

However, in the conventional private branch exchange,
In the case of digital telephone terminals such as ISDN telephone terminals,
If the ISDN telephone terminal goes on-hook (disconnects) during a call with the relay stand, the disconnection sequence of layer 3 runs inside the private branch exchange, and the ISDN telephone terminal becomes idle. As a result, when the ISDN telephone terminal makes a call again (off-hook), a new call is made, and even if an attempt is made to call back the terminal from the relay stand in this state, it will be encountered during the call. In some cases, reconnection was not possible.

From this point of view, even in the case of a digital telephone terminal, if a disconnection occurs during a call with the relay stand, a private branch exchange apparatus capable of performing the same operation as the analog telephone terminal as seen from the relay stand. Realization was desired.

[0006]

The present invention adopts the following constitution in order to solve the above-mentioned problems. That is, the private branch exchange apparatus of the first invention is a private branch exchange apparatus in which a digital telephone terminal is connected as an extension connection and a relay stand for operating calls of all extension connection telephone terminals is connected. When a call is disconnected from the digital telephone terminal while the call between the terminal and the relay stand is established, the digital telephone terminal is reserved and a call connection request is made from the digital telephone terminal. In this case, a digital interface control unit for unconditionally connecting to the relay stand is provided.

The private branch exchange apparatus of the second invention is an ISDN telephone equipment which is connected to an ISDN telephone terminal as an extension connection and is connected to a relay stand for operating calls of all extension connection telephone terminals. When a call is established between the telephone terminal and the relay stand, call control data including the termination point identifier of the ISDN telephone terminal and the reservation flag is created, and in this state,
When the call is disconnected from the ISDN telephone terminal, the reservation flag in the call control data is set to "reserved" and one of the I
When there is a call connection request from the SDN telephone terminal, the call control data is referred to, the termination point identifier of the ISDN telephone terminal that has made the call connection request matches, and the reservation flag is "reserved". In this case, a digital interface control unit for unconditionally connecting the ISDN telephone terminal and the relay stand is provided.

The private branch exchange of the third invention is a private branch exchange in which a digital telephone terminal is connected as an extension connection and a relay stand for operating calls of all extension connected telephone terminals is connected. If a reservation is specified for a call from an arbitrary digital telephone terminal from the console, the digital telephone terminal is considered as reserved, and if there is a call connection request from the digital telephone terminal, it is unconditionally relayed. And a digital interface control unit for connecting to.

The private branch exchange of the fourth aspect of the invention is a private branch exchange in which ISDN digital telephone terminals are connected as extension connections and relay stations for performing call operations of all extension-connected telephone terminals are connected. The digital telephone terminal is provided with a predetermined extension number and includes the extension number and the reservation flag of the digital telephone terminal when a reservation is designated for a call of an arbitrary digital telephone terminal from the relay stand. If call control data is created, the reservation flag is set to "reserved", and if a call connection request is made from one of the digital telephone terminals, the call control data is referred to and the extension of the digital telephone terminal that made the call connection request. The numbers match,
Further, when the reservation flag is "reserved", a digital interface control unit for unconditionally connecting the digital telephone terminal and the relay stand is provided.

[0010]

In the private branch exchange of the first aspect of the present invention, when the call is disconnected from the digital telephone terminal while the call between the digital telephone terminal and the relay stand is established, the digital interface control section When the digital telephone terminal is reserved and a call connection request is made from the digital telephone terminal, the digital telephone terminal is unconditionally connected to the relay stand.

In the private branch exchange of the second aspect of the invention, the digital interface controller comprises an ISDN telephone terminal,
When the call with the relay stand is established, call control data including the termination point identifier of the ISDN telephone terminal and the reservation flag is created.
Then, in this state, when the call is disconnected from the ISDN telephone terminal, the reservation flag in the call control data is set to reservation. Further, when a call connection request is made from any of the ISDN telephone terminals, the digital interface control unit refers to the call control data and makes a call connection request.
When the termination point identifiers of the SDN telephone terminals match and the reservation flag is "reserved", the ISDN telephone terminal and the relay stand are unconditionally connected.

In the private branch exchange of the third aspect of the present invention, when reservation is designated from the repeater for a call of an arbitrary digital telephone terminal, the digital interface control unit determines that the digital telephone terminal is under reservation. . And
When a call connection request is made from the digital telephone terminal, it is unconditionally connected to the relay stand.

In the private branch exchange of the fourth aspect of the invention, when a reservation is designated for a call of an arbitrary digital telephone terminal from the relay stand, the digital interface control section first sets the extension number of the digital telephone terminal. Call control data including a reservation flag is created and the reservation flag is set to be reserved. Then, when there is a call connection request from any one of the digital telephone terminals, the digital interface control unit refers to the call control data, the extension numbers of the digital telephone terminals that have made the call connection request match, and If the reservation flag is "reserved", the digital telephone terminal and the relay stand are unconditionally connected.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. << Embodiment 1 >> FIG. 1 is a block diagram showing Embodiment 1 of a private branch exchange of the present invention. The illustrated private branch exchange 10 includes a call controller 11 and a digital interface controller 12, and the call controller 11 includes a plurality of analog telephone terminals 20.
(20-1 to 20-n) and the relay stand 30 are connected,
A plurality of digital telephone terminals 40 (40-1 to 40-n) are connected to the digital interface controller 12.

The call control unit 11 is a functional module that performs all call control in the private branch exchange 10, and is connected to the analog telephone terminal 20 and the relay stand 30 and is connected to the ISDN as a station side network. Has been done. Although these are connected via an interface corresponding to each protocol, their illustration and description are omitted.

The digital interface controller 12 is
When the call is disconnected from the digital telephone terminal 40 while the call between the digital telephone terminal 40 and the relay stand 30 is established, the digital telephone terminal 40 is reserved and the digital telephone terminal 40 When there is a call connection request, it has a function of unconditionally connecting to the relay stand 30. Here, the case of the ISDN interface control unit is shown, and the layer 3 signal analysis control unit 12a and the call number management area 12b are provided. Is equipped with. Layer 3 signal analysis control unit 12
Reference numeral a is a functional module that performs layer 3 signal analysis based on the OSI (Open Systems Interconnection) reference model, and when performing call control with the digital telephone terminal 40, the call number management area 12
b has a function of creating and deleting call control data. The call number management area 12b is an area for storing management data corresponding to each call, and the call number management area 12b will be described later.

The analog telephone terminal 20 is a telephone for an analog line, and the call control section 11 performs call control. The digital telephone terminal 40 is the ISD in this case.
The figure shows the case of N telephone terminals, and 8 for one subscriber line.
Up to digital telephone terminals are connected (ISD
N basic interface). Although only one subscriber line is shown in the illustrated example, it is assumed that a plurality of subscriber lines are connected. The digital telephone terminal 40 is also assumed to be connected to the digital interface control unit 12 via an interface corresponding to this.

The relay stand 30 is a device for making a call to the extension of the other party when a communication connection request is made from an outside line, and an operator performs such an operation.

FIG. 2 is an explanatory diagram of the call number management area 12b. Here, the interface group number is I
This is a number for identifying a group of subscriber lines in SDN, and the next table address corresponding to each interface group number is stored. The normalized call number is a number as a (normalized) index for managing calls in the digital interface control unit 12, and call control data is managed for each call number. ing.

That is, the call number in the call control data is
The identification number of the call control data, and the B channel number is B1 or B in the case of ISDN basic interface.
It is data indicating which channel of 2 channels. Further, the terminal point identifier indicates which terminal the terminal connected to is the call, and the transfer capability defines the information transfer capability such as voice or data. Further, the reservation flag is a flag for identifying whether or not the digital telephone terminal 40 is making a reservation.

As described above, when the call between the digital telephone terminal 40 and the relay stand 30 is established, the digital interface controller 12 sets the termination point identifier and the reservation flag of the digital telephone terminal 40 in the call number management area 12b. If the call control data including the call control data is created and the call is disconnected from the digital telephone terminal 40 in this state, the reservation flag in the call control data is set to "reserved" and a call connection request is made from one of the digital telephone terminals 40. If there is a call, the call control data is referred to, and if the termination point identifier of the digital telephone terminal 40 that made the call connection request matches and the reservation flag is "reserved", the digital telephone terminal 40 40 and the relay stand 30 are configured to be connected unconditionally.

As a hardware configuration for realizing each functional module of the above-described embodiment, a control unit including a processor, a main storage device and an execution program, and an exchange in which the exchange control is performed by the control unit. It is composed of parts and the like.

Next, the operation of this embodiment will be described. (1) Reserving Operation of Digital Telephone Terminal 40 First, when the digital telephone terminal 40 makes an outgoing call or receives an incoming call to the digital telephone terminal 40, the digital interface control unit 12 displays in the call number management area 12b,
The normalized call number, B channel number, termination point identifier, and transfer capability are set.

When making a reservation for the digital telephone terminal 40, that is, during a mutual call with the relay stand 30, the relay stand 30 does not perform a release operation for the digital telephone terminal 40 and the digital telephone terminal 40 disconnects. If so, the digital interface control unit 12 holds the B channel when the call disappears, clears the corresponding call control data, and sets the reservation flag to "reserving". That is, if a call disappears without a release operation from the relay stand 30 during a call between the arbitrary digital telephone terminal 40 and the relay stand 30, the digital telephone terminal 40 is reserved.

(2) Operation at Reconnection of Digital Telephone Terminal 40 When a call is made from any digital telephone terminal 40, the layer 3 signal analysis control section 12a analyzes the signal of the call and controls the digital interface. The part 12 searches the call number management area 12b before setting the call control data in the call number management area 12b, and there is a part in which the reservation flag is reserved and the termination point identifier and the transmission capability match. In this case, it is considered that the call is made from the reserved digital telephone terminal 40, and the call control unit 11 is notified of that fact. As a result, the call control unit 11 compulsorily establishes a communication connection with the relay stand 30 for the origination of the digital telephone terminal 40. If at least one of the termination point identifier and the transfer capability does not match, a normal processing is performed as a new call.

(3) Reservation canceling operation in the digital telephone terminal 40 The reservation canceling operation is performed when the above-mentioned reconnection with the relay stand 30 is performed or when the relay stand 30 makes a reservation to the digital telephone terminal 40. When the release operation is performed, the reservation is released.

As described above, according to the first embodiment, when the call is disconnected from the digital telephone terminal 40 while the call between the digital telephone terminal 40 and the relay stand 30 is established, When the digital telephone terminal 40 is reserved and the call connection request is made from the digital telephone terminal 40, the digital telephone terminal 40 is unconditionally connected to the relay stand. Therefore, the call back from the relay stand 30 is busy. It is possible to prevent the connection failure.

Further, in the first embodiment, when a call connection request is made from an arbitrary digital telephone terminal 40, whether the digital telephone terminal 40 is being reserved is determined by the termination point identifier and the reservation flag of the call control data. Since the determination is made, the ISDN telephone terminal can be surely identified with a simple configuration.

Next, an embodiment in which an outside line waiting request transmission (in-to-out) service is realized for the digital telephone terminal 40 will be described. Note that the outside line waiting request transmission service is, for example, designated to the external base station 30 from an arbitrary digital telephone terminal 40 to transmit an external line to a specific party at a certain time. In this service, the requested outside line is transmitted, and when the communication connection to the other party is made, the requested digital telephone terminal 40 is called.

<Embodiment 2> In this embodiment, the configuration in the drawing is the same as that in FIG. 1, so that the illustration is omitted, but the function of the digital interface control unit 12 is different. That is, in the second embodiment, the digital interface controller 12 controls the digital telephone terminal 40
When the call with the relay stand 30 is established, the call number and
Call control data including a termination point identifier and a reservation flag is created in the call number management area 12b, and when the call is disconnected from the digital telephone terminal 40 in this state, the call number in the call control data is cleared and When the reservation flag is set to be reserved and a call connection request is made from any of the digital telephone terminals, the call control data is referred to, and the termination point identifier of the digital telephone terminal 40 that made the call connection request is matched. When the reservation flag is "reserved", the digital telephone terminal 40 is unconditionally connected to the relay stand 30. However, in this case, it is assumed that an extension number is set in advance for each digital telephone terminal 40.

FIG. 3 is an explanatory diagram of the call number management area 12b in the second embodiment. As shown in the figure, in the second embodiment, an extension number field is added to the call control data. The extension number is a number given to each digital telephone terminal 40 as described above, and is set in advance. That is, in Example 1,
Although the reservation was made with the terminal point identifier, when the relay stand 30 reserves any one of the digital telephone terminals 40, the terminal point identifier has not yet been determined. Therefore, as a means for identifying the digital telephone terminal 40, An extension number is used.

Next, the operation of this embodiment will be described. (1) Reservation operation of the digital telephone terminal 40 When making a reservation for the digital telephone terminal 40, the relay stand 3
The operation is performed from 0. That is, the relay stand 30 operates based on the time requested by the digital telephone terminal 40. As this operation, a specific key such as a reservation key is assigned to the relay stand 30 in advance, and “press the reservation key +
Enter the extension number of the digital telephone terminal 40 you want to reserve "
Make that reservation by. Note that this operation is not limited to a method such as a specific key set in advance, and a method of inputting a number for reservation may be used instead.

As a result, the digital interface control unit 12 creates call control data in the empty area of the call number management area 12b, sets the extension number of the digital telephone terminal 40 to be reserved in the extension number field, and reserves it. Flag is reserved.

(2) Operation at the time of making a call from the digital telephone terminal 40 When a call is made from any digital telephone terminal 40, the layer 3 signal analysis control section 12a analyzes the signal of the call, The calling number management area 12b is searched with the calling number. As a result of the search, if the extension numbers in the call control data match and the reservation flag is reserved, it is determined that the call is made from the reserved digital telephone terminal 40, and the call control unit 11 is notified. The call controller 11 first notifies the digital telephone terminal 4 of the fact.
A hold tone is played to 0, and it is confirmed that the relay stand 30 is not in a talking state with others, and the connection is established. On the other hand, if the extension numbers do not match or if the reservation is not in progress, the call is processed as a new call.

When there is a connection request from the outside line or the like to the reserved digital telephone terminal 40, that is, when the reserved digital telephone terminal 40 receives a call, the calling side is busy. .

(3) Reservation cancellation operation in the digital telephone terminal 40 The reservation cancellation operation is released when the connection with the relay stand 30 described above is made or from the relay stand 30 to the reserved digital telephone terminal 40. It is performed when the operation is performed.

As described above, according to the second embodiment, when a reservation operation is performed from the relay stand 30 to any digital telephone terminal 40 and a call connection request is made from the digital telephone terminal 40, no call is made. Since the connection is made with the relay stand 30 under the condition, the request transmission service (waiting request transmission) in which the external line is called and then the reserved extension is called is possible. That is, conventionally, in the case of the digital telephone terminal 40, in the on-hook state, the disconnection sequence of the layer 3 unconditionally runs, and the call cannot be held (reserved) in the on-hook state. In the example, the request transmission service described above can be performed by using the extension number data and the reservation flag.

Further, in the second embodiment, when a call connection request is made from any digital telephone terminal 40, the digital telephone terminal 4 which is making a reservation depends on the extension number and the reservation flag.
Since it is discriminated whether or not it is 0, no special configuration is required for the relay stand 30 or the digital telephone terminal 40 for the outside line waiting request transmission service, and the outside line waiting request transmission service is extremely easy. Can be realized.

In each of the above embodiments, the digital telephone terminal 40 is described as an ISDN telephone terminal. However, the present invention is not limited to this, and any other standard may be used as long as the reservation is made based on call control data. It may be a digital telephone terminal.

[0040]

As described above, according to the private branch exchange of the present invention, when the call is disconnected from the digital telephone terminal while the call between the digital telephone terminal and the relay stand is established. , The digital telephone terminal is being reserved, and when a call connection request is made from the digital telephone terminal, it is connected to the relay stand unconditionally. This can be prevented in advance.

When a reservation is designated from the relay stand for a call of an arbitrary digital telephone terminal, the digital telephone terminal is considered to be reserved and a call connection request is made from the digital telephone terminal. Since it is unconditionally connected to the relay stand, even a digital telephone terminal can realize an outside line waiting request transmission service.

[Brief description of the drawings]

FIG. 1 is a block diagram of a private branch exchange of the present invention.

FIG. 2 is an explanatory diagram of a call number management area in the first embodiment of the private branch exchange of the present invention.

FIG. 3 is an explanatory diagram of a call number management area in a second embodiment of the private branch exchange of the present invention.

[Explanation of symbols]

 10 Private branch exchange device 12 Digital interface control unit 12a Layer 3 signal analysis control unit 12b Call number management area 30 Relay stand 40 Digital telephone terminal (ISDN telephone terminal)

Claims (4)

[Claims] 1. A private branch exchange apparatus to which a digital telephone terminal is connected as an extension connection and a relay stand for performing a call operation of all extension connection telephone terminals is connected, wherein the digital telephone terminal and the relay If a call is disconnected from the digital telephone terminal while the call to the stand was established, the digital telephone terminal is reserved and if a call connection request is made from the digital telephone terminal, A private branch exchange comprising a digital interface control unit for unconditionally connecting to the relay stand. 2. A private branch exchange apparatus to which an ISDN telephone terminal is connected as an extension connection and a relay stand for performing a call operation of all extension connection telephone terminals is connected, wherein the ISDN telephone terminal and the relay are provided. When a call with the base station is established, call control data including a termination point identifier and a reservation flag of the ISDN telephone terminal is created, and in this state, the IS
When the call is disconnected from the DN telephone terminal, the reservation flag in the call control data is set to "reserving", and when a call connection request is made from any of the ISDN telephone terminals, the call control data is referred to and If the termination point identifier of the ISDN telephone terminal that has made the call connection request matches and the reservation flag is reserved, the ISD
A private branch exchange comprising a digital interface control unit for unconditionally connecting an N telephone terminal and the relay stand. 3. A private branch exchange apparatus in which a digital telephone terminal is connected as an extension connection, and a relay stand for performing a call operation of all extension connected telephone terminals is connected, wherein an arbitrary digital signal is supplied from the relay stand. When a reservation is designated for a call of a telephone terminal, the digital telephone terminal is reserved and when a call connection request is made from the digital telephone terminal, the call is unconditionally connected to the relay stand. A private branch exchange equipped with a digital interface controller. 4. A private branch exchange apparatus to which an ISDN digital telephone terminal is connected as an extension connection, and a relay stand for performing a call operation of all extension connection telephone terminals is connected. In addition to having a predetermined extension number, when a reservation is designated for a call of any digital telephone terminal from the relay stand, call control data including the extension number of the digital telephone terminal and a reservation flag is provided. When the reservation flag is created and reserved, and a call connection request is made from one of the digital telephone terminals, the extension number of the digital telephone terminal that made the call connection request is referred to by referring to the call control data. If they match and the reservation flag is "reserved", the digital interface for unconditionally connecting the digital telephone terminal and the relay stand. A private branch exchange comprising a base control unit.