JP3287380B2 - Private branch exchange - Google Patents

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 for a digital telephone terminal connected to an extension.

[0002]

2. Description of the Related Art Today, an ISDN is connected to an office line, a digital telephone terminal such as an analog telephone terminal or an ISDN telephone terminal, or a digital data terminal or the like is connected to an extension line to exchange each terminal with an office line. In addition, a private branch exchange that exchanges terminals connected by extension is used. Further, in such a private branch exchange, a relay station for performing an exchange operation between an extension-connected terminal and an external line and a call operation between each extension-connected terminal is provided. Is to be operated.

[0003]

In the private branch exchange described above, even if the analog telephone terminal is disconnected during a call with the terminal, the analog telephone terminal can be reconnected to the relay console by simply off-hook the analog telephone terminal. Can be connected.
In other words, even if the analog telephone terminal accidentally goes on-hook during a call with the attendant console, reconnection can be performed unless a call disconnection operation is performed from the attendant console.

However, in a conventional private branch exchange,
In the case of a digital telephone terminal such as an ISDN telephone terminal,
If the ISDN telephone terminal goes on-hook (disconnects) during a call with the attendant console, the layer 3 disconnection sequence runs inside the private branch exchange, and the ISDN telephone terminal becomes idle. As a result, when the ISDN telephone terminal redials (off-hook), the call is originated as a new call. In this state, even if an attempt is made to return the terminal from the attendant console to the terminal, the terminal will encounter a busy call. In some cases, reconnection was not possible.

[0005] In view of the above, even in the case of a digital telephone terminal, if a disconnection occurs during a call with a relay console, a private branch exchange device that can perform the same operation as an analog telephone terminal as viewed from the relay console. 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 of the first invention is a private branch exchange in 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. and the terminal, when the call with the attendant has been established, if the digital telephone terminal from the call disconnection is performed, a digital telephone terminal and in reservation, from the digital telephone terminal, the call connection request there Ri And the relay
When the stand is waiting for a call connection with a digital telephone terminal
Is characterized by comprising a digital interface control unit for making a call connection with the relay console .

A private branch exchange according to a second aspect of the present invention is a private branch exchange in which an ISDN telephone terminal is connected as an extension connection and a relay console for operating calls of all extension connection telephone terminals is connected. When a call between the telephone terminal and the attendant console is established, call control data including a termination point identifier of the ISDN telephone terminal and a 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 determined to be reserved and
When there is a call connection request from SDN telephone terminal, by referring to the call control data, and end point identifier of the ISDN telephone terminal there is a call connection request matches, and that has become the reservation flag and during booking Connection with ISDN telephone terminal
When the apparatus is in the waiting state, a digital interface control unit for call- connecting the ISDN telephone terminal and the relay console is provided.

A private branch exchange according to a third aspect of the present 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 connection telephone terminals is connected. When a reservation is specified for a call of an arbitrary digital telephone terminal from the telephone, the digital telephone terminal is determined to be reserved, and when a call connection request is issued from the digital telephone terminal, a call connection with the relay console is made. And a digital interface control unit for performing the following.

A private branch exchange according to a fourth aspect of the present invention is a private branch exchange in which an ISDN digital telephone terminal is connected as an extension connection, and a relay console for operating calls of all extension connection telephone terminals is connected. The digital telephone terminal has a predetermined extension number and, when a reservation is designated for a call of an arbitrary digital telephone terminal from the attendant console, includes the extension number of the digital telephone terminal and a reservation flag. The call control data is created, the reservation flag is set to "reserved", and if a call connection request is issued from any of the digital telephone terminals, the call control data is referred to and the extension of the digital telephone terminal that has issued the call connection request is referred to. The numbers match,
When the reservation flag indicates that the reservation is being made, a digital interface control unit for call- connecting the digital telephone terminal to the relay console is provided.

[0010]

In the private branch exchange according to the first aspect of the present invention, when a call between the digital telephone terminal and the attendant console is established and the call is disconnected from the digital telephone terminal, the digital interface control unit includes: A digital telephone terminal is reserved and a call connection request is received from this digital telephone terminal.
And the attendant console waits for a call connection with the digital telephone terminal
If it is in the state, the call is connected to the relay console .

In the private branch exchange according to a second aspect of the present invention, the digital interface control unit includes: an ISDN telephone terminal;
When a call with the relay console is established, call control data including a termination point identifier of the ISDN telephone terminal and a reservation flag is created.
When the call is disconnected from the ISDN telephone terminal in this state, the reservation flag in the call control data is set to "reserving". Further, any of the call connection request there from ISDN telephone terminal is, and, attendant is an ISDN telephone terminal
In the call connection waiting state , the digital interface control unit refers to the call control data, and the termination point identifier of the ISDN telephone terminal that has made the call connection request matches, and the reservation flag of the ISDN telephone terminal is being reserved. The ISD
A call connection is made between the N telephone terminal and the relay console .

In the private branch exchange according to the third aspect of the invention, when a reservation is specified for a call of an arbitrary digital telephone terminal from the attendant console, the digital interface control unit sets the digital telephone terminal as being reserved. . And
When there is a call connection request from the digital telephone terminal, the call is connected to the relay console .

In the private branch exchange according to a fourth aspect of the present invention, when a reservation is specified for a call of an arbitrary digital telephone terminal from the attendant console, the digital interface control unit firstly determines the extension number of the digital telephone terminal and Call control data including a reservation flag is created, and the reservation flag is set to reserved. Then, when a call connection request is received from any of the digital telephone terminals, the digital interface control unit refers to the call control data, and the extension number of the digital telephone terminal that has made the call connection request matches, and If the reservation flag indicates that the reservation is being made, the digital telephone terminal is connected to the relay console by call .

[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 according to the present invention. The illustrated private branch exchange 10 includes a call control unit 11 and a digital interface control unit 12. The call control unit 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 control unit 12.

The call control unit 11 is a functional module for performing all call control in the private branch exchange 10, and is connected to the analog telephone terminal 20 and the relay console 30, and is connected to the ISDN as the office-side network. Have been. These are connected via interfaces corresponding to the respective protocols, but their illustration and description are omitted.

The digital interface control unit 12
When a call between the digital telephone terminal 40 and the attendant console 30 is established and the call is disconnected from the digital telephone terminal 40, the digital telephone terminal 40 is determined to be reserved and the digital telephone terminal 40 When there is a call connection request, it has a function of unconditionally connecting to the relay console 30. Here, the case of the ISDN interface control unit is shown, and the layer 3 signal analysis control unit 12a, the call number management area 12b, It has. Layer 3 signal analysis control unit 12
Reference numeral a denotes a functional module that performs layer 3 signal analysis based on an OSI (Open Systems Interconnection) reference model, and performs a call number management area 12 when performing call control with the digital telephone terminal 40.
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 call control is performed by a call control unit 11. Also, the digital telephone terminal 40 here is an ISD
The figure shows the case of N telephone terminals, with 8 per subscriber line.
Up to two digital telephone terminals are connected (ISD
N basic interfaces). In the illustrated example, only one subscriber line is shown, but it is assumed that a plurality of subscriber lines are connected. It is assumed that the digital telephone terminal 40 is also connected to the digital interface control unit 12 via an interface corresponding thereto.

The relay console 30 is a device for calling the extension of the other party when a communication connection request is made from an outside line, and such an operation is performed by an operator.

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 the group of the subscriber line in the 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 a call in the digital interface control unit 12, and the call control data is managed for each call number. ing.

That is, the call number in the call control data is
This is the identification number of the call control data, and the B channel number is B1 or B1 in the case of the ISDN basic interface.
2 is data indicating which of the two channels. The terminating point identifier indicates to which terminal the call is connected to a terminal, and the transmission capability defines 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 a call between the digital telephone terminal 40 and the attendant console 30 is established, the digital interface control unit 12 stores the terminal point identifier of the digital telephone terminal 40 and the reservation flag in the call number management area 12b. When call disconnection is performed 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 issued from any of the digital telephone terminals 40. If there is, the digital telephone terminal 40 refers to the call control data, and if the terminal point identifier of the digital telephone terminal 40 for which the call connection request has been made matches and the reservation flag is reserved, the digital telephone terminal 40 It is configured to connect the relay station 30 and the relay station 30 unconditionally.

The hardware configuration for realizing each of the functional modules of the present embodiment includes a control unit including a processor, a main storage device, and an execution program, and an exchange unit in which 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) Reservation Operation of Digital Telephone Terminal 40 First, when the digital telephone terminal 40 makes a call or receives an incoming call to the digital telephone terminal 40, the digital interface control unit 12 stores the call number in the call number management area 12b.
The normalized call number, B channel number, terminal point identifier, and transmission capability are set.

When the digital telephone terminal 40 is reserved, that is, during intercommunication with the relay console 30, the digital telephone terminal 40 disconnects without releasing the relay telephone 30 to the digital telephone terminal 40. 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 reserved. That is, if a call is lost without any release operation from the relay console 30 during a call between the arbitrary digital telephone terminal 40 and the relay console 30, the digital telephone terminal 40 is set to be reserved.

(2) Operation at the time of reconnection of the digital telephone terminal 40 When a call is made from an arbitrary digital telephone terminal 40, the layer 3 signal analysis control unit 12a analyzes the signal of the call and performs digital interface control. The unit 12 searches the call number management area 12b before setting the call control data in the call number management area 12b, and finds that the reservation flag is reserved and the termination point identifier matches the transmission capability. In this case, it is considered that the call originated from the digital telephone terminal 40 that is making a reservation, and the call control unit 11 is notified of that fact. Accordingly, the call control unit 11 forcibly establishes a communication connection with the relay console 30 in response to a call from the digital telephone terminal 40. If at least one of the terminal point identifier and the transmission capability does not match, a normal process is performed as a new call.

(3) Reservation Release Operation in Digital Telephone Terminal 40 The reservation release operation is performed when the above-described reconnection with the relay console 30 is performed, or when the digital telephone terminal 40 is making a reservation from the relay console 30. When the release operation is performed, the reservation is released.

As described above, according to the first embodiment, when a call between the digital telephone terminal 40 and the console 30 is established and the call is disconnected from the digital telephone terminal 40, The digital telephone terminal 40 is reserved, and if there is a call connection request from the digital telephone terminal 40, the terminal is unconditionally connected to the relay console. It is possible to prevent that connection cannot be established.

In the first embodiment, when a call connection request is received from an arbitrary digital telephone terminal 40, whether or not 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, identification of the ISDN telephone terminal can be reliably performed with a simple configuration.

Next, an embodiment for realizing an outside line waiting request transmission (in-to-out) service to the digital telephone terminal 40 will be described. The outside line waiting request transmission service is, for example, that an arbitrary digital telephone terminal 40 specifies to the relay console 30 that an external line is to be transmitted to a specific party at a certain time, and the relay console 30 sets the time at that time. In this service, the requested outside line is transmitted in the event that the request has been made, and the requested digital telephone terminal 40 is called when the communication connection to the other party is established.

<< Embodiment 2 >> In this embodiment, since the configuration on the drawing is the same as that of FIG. 1, its illustration is omitted, but the function of the digital interface control unit 12 is different. That is, in the second embodiment, the digital interface control unit 12
From the console 30 to any digital telephone terminal 40
When a reservation is specified for a call, the digital
Call control data including the extension number of the talk terminal 40 and the reservation flag.
Create a reservation flag and set the reservation flag to
When there is a call connection request from the digital telephone terminal 40,
Refers to the control data, and the digital
If the extension number of the telephone terminal 40 matches and the reservation
If the call was reserved, the digital phone
The terminal 40 and the relay console 30 are configured to be call-connected . 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 assumed to be set in advance. That is, in the first embodiment,
Although the reservation was made with the terminal point identifier, when the intermediary console 30 reserves any digital telephone terminal 40, the terminal point identifier has not yet been determined, and therefore, as means for specifying the digital telephone terminal 40, The 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 console 3
Perform the operation from 0. That is, the console 30 performs its operation 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 console 30 in advance, and “pressing a reservation key +
Enter the extension number of the digital telephone terminal 40 you want to reserve "
Makes that reservation. This operation is not limited to a specific key set in advance, but may be a method such as inputting a number for reservation.

Thus, the digital interface control unit 12 creates call control data in an empty area of the call number management area 12b, sets the extension number of the digital telephone terminal 40 to be reserved in its extension number field, and Flag is reserved.

(2) Operation when the digital telephone terminal 40 originates a call When an arbitrary digital telephone terminal 40 originates a call, the layer 3 signal analysis control unit 12a analyzes the signal of the call, and outputs the signal in the call setup message. The call number management area 12b is searched for 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 originates from the digital telephone terminal 40 that is making the reservation, and the call control unit 11 The call control unit 11 notifies the digital telephone terminal 4
A hold tone is played for 0, and after confirming that the relay console 30 is not in a call state with another, connection is established. On the other hand, when the extension numbers do not match or when the reservation is not being made, processing is performed as a new call.

When there is a connection request to the reserved digital telephone terminal 40 from an outside line or the like, that is, when an incoming call arrives at the reserved digital telephone terminal 40, it is determined that the calling side is busy. .

(3) Reservation Release Operation in Digital Telephone Terminal 40 The reservation release operation is performed when the connection with the above-mentioned intermediary console 30 is established or when the digital telephone terminal 40 under reservation is released from the intermediary console 30. Performed when an operation is performed.

As described above, according to the second embodiment, a reservation operation is performed from the relay console 30 to an arbitrary digital telephone terminal 40, and if there is a call connection request from the digital telephone terminal 40, no operation is performed. Since the connection with the relay console 30 is made under the condition, a request transmission service (call during standby request) in a form of calling an outside line and then calling a reserved extension becomes 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 runs unconditionally, and the call cannot be held (reserved) in the on-hook state. In the example, the request transmission service described above is enabled by using the extension number data and the reservation flag.

In the second embodiment, when a call connection request is received from an arbitrary digital telephone terminal 40, the digital telephone terminal 4 being reserved is determined by the extension number and the reservation flag.
Since it is determined whether it is 0 or not, a special configuration is not required for the relay console 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. If the reservation is made based on call control data, other standards may be used. It may be a digital telephone terminal.

[0040]

As described above, according to the private branch exchange of the present invention, when a call between the digital telephone terminal and the attendant console is established, the call is disconnected from the digital telephone terminal. The digital telephone terminal is reserved, and when a call connection request is issued from the digital telephone terminal, the terminal is unconditionally connected to the relay console. This can be prevented beforehand.

Also, when a reservation is designated from the attendant console for a call of an arbitrary digital telephone terminal, the digital telephone terminal is determined to be reserved and a call connection request is issued from the digital telephone terminal. Is unconditionally connected to a relay console, so that even a digital telephone terminal can provide an outside line waiting request transmission service.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Private branch exchange 12 Digital interface control part 12a Layer 3 signal analysis control part 12b Call number management area 30 Attendant console 40 Digital telephone terminal (ISDN telephone terminal)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 3/42-3/64 H04Q 3/58-3/62

Claims (4)

(57) [Claims] 1. A private branch exchange 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 when the call with the platform has been established, if the disconnection of the call from the digital telephone terminal has been performed, the digital telephone terminal and in reservation, from the digital telephone terminal, the call connection request there is, and,
The relay console waits for a call connection with the digital telephone terminal.
The private branch exchange device further comprises a digital interface control unit for making a call connection with the relay console when the mobile terminal is in a state . 2. A private branch exchange to which an ISDN telephone terminal is connected as an extension connection and a relay console for performing a call operation of all the extension connection telephone terminals is connected, wherein the ISDN telephone terminal and the relay When a call is established, call control data including a termination point identifier of the ISDN telephone terminal and a reservation flag is created.
When the call is disconnected from the DN telephone terminal, the reservation flag in the call control data is set to "reserved", and when a call connection request is issued from any of the ISDN telephone terminals, the call control data is referred to. match end point identifier of the ISDN telephone terminal there is a call connection request, and, Rutotomoni has become the reservation flag and in reservation, the attendant
The private branch exchange device further comprises a digital interface control unit for making a call connection between the ISDN telephone terminal and the relay console when the device is in a call connection waiting state with the ISDN telephone terminal. 3. A private branch exchange in which a digital telephone terminal is connected as an extension connection and a relay console for operating calls of all extension connection telephone terminals is connected. When a reservation is specified for a call from a telephone terminal, the digital telephone terminal is reserved and, when a call connection request is issued from the digital telephone terminal, a digital interface for making a call connection with the relay console. A private branch exchange device comprising a control unit. 4. A private branch exchange in which an ISDN digital telephone terminal is connected as an extension connection and a relay console for performing a call operation of all the extension connection telephone terminals is connected. In addition to having a predetermined extension number, when a reservation is designated for a call of an arbitrary digital telephone terminal from the relay console, call control data including an extension number of the digital telephone terminal and a reservation flag is transmitted. When the reservation flag is created and the reservation flag is being reserved, and a call connection request is made from any of the digital telephone terminals, the extension number of the digital telephone terminal that has made the call connection request is referred to by referring to the call control data. If they match and the reservation flag is reserved, a digital interface for call- connecting the digital telephone terminal with the relay console A private branch exchange device comprising a control unit.