JP3297119B2 - 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 to which an ISDN network is connected, and more particularly to an incoming call notification during communication to an extension terminal when the extension terminal receives a new call when the extension terminal is busy.

[0002]

2. Description of the Related Art Conventionally, private branch exchanges of this kind use ISDN.
A central office interface for receiving a call from the network, a terminal interface for controlling the connected extension terminals, an exchange circuit for connecting these terminal interfaces to each other, or a terminal interface and an office interface, and controlling the exchange circuit. And a control unit for controlling various services such as notification of incoming calls during communication, and a storage unit necessary for the operation of the control unit. In such a private branch exchange, if all the terminal interfaces in the group capable of accepting the incoming call notification during communication become B-channel busy, a new call for the representative terminal interface is sent to the central office interface. Only when an incoming call is received, the representative terminal interface accepts the communication-incoming call notification for the incoming call so as to perform the communication-incoming call notification to the extension telephone that is connected to the telephone and connected to the terminal interface.

However, when a plurality of calls arrive at the central office interface for the representative terminal interface in such a state, the representative terminal interface is in a state of already accepting the incoming call notification during communication. Therefore, it is not possible to accept the incoming call notification during communication for calls that arrive later, and there is a disadvantage that these calls are disconnected. Note that the notification of incoming call during communication is I
Even when the extension telephone to which the call input from the SDN network is connected to the office line interface is busy and busy, the control unit does not disconnect the incoming call, for example, keeps the call in a call state and waits for the call. This function refers to a function of making the extension interface terminal immediately receive the call that has been kept waiting after the call is terminated after the communication termination notification is made to the extension terminal via the destination terminal interface.

[0004]

In a conventional private branch exchange connecting an ISDN network, all terminal interface groups capable of accepting an incoming call notification during communication are in the B-channel busy state, and the representative terminal interface has already been established. If more than one call arrives at this terminal interface while the incoming call notification is being accepted, the incoming call notification cannot be accepted for the incoming call and the incoming call will be disconnected. There was the inconvenience of being done.

Accordingly, the present invention eliminates the above-mentioned disadvantages, and in a state where a representative terminal interface constituting a group is communicating, another incoming call arrives at the group after already accepting an incoming call notification during communication. In this case, it is an object of the present invention to provide a private branch exchange that allows another terminal interface in the group to accept the incoming call notification during communication for another incoming call.

[0006]

A private branch exchange according to the present invention.
Is in communication due to answering the incoming call
Group that includes a plurality of extension terminals having display means for receiving notification information indicating that a new incoming call has occurred, and an incoming call to the incoming group occurs. Is not communicating within the called group.
There detecting the internal terminal of the empty state, a reception control means for creating an incoming of the air state to the extension terminal, to the terminating group
Communicating in the incoming call group when an incoming call of
If there is no empty extension terminal , the incoming call is kept in the ringing state.
The through to the first extension terminal as well as a wait state where Tsu
Detecting whether or not the knowledge information has been accepted;
If the notification information for the line terminal is not accepted
In the case, the display means of the first extension terminal is
Sending notification information to the first extension terminal.
When the knowledge information is received, the notification information is received.
Unattached extension terminal is detected and the notification information is
For the display means of the extension terminal that is not accepted
Notification control means for transmitting the notification information .

[0007]

According to the above arrangement, all the groups within the called group
All extension terminals are answering the incoming call.
If a call is made, the incoming call is placed in a waiting state,
Notification information of the first extension terminal in the called group
First, and the display means of this first extension terminal is
If notification information is accepted, accept the notification information
The display means of the extension terminal in the receiving group
Detection is performed, and notification information indicating that another incoming call has occurred during communication is sent to the display means of the extension terminal in the receiving group that has not received the notification information .

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the private branch exchange of the present invention. 1 is a private branch exchange, 2 is an ISDN network,
Reference numerals 3-1 to 3-4 denote extension telephones connected to the private branch exchange 1. 11 is a line interface 12-1 to 12-m
A switching circuit for connecting / disconnecting the terminal interfaces 13-1 to 13-4 or connecting / disconnecting the terminal interfaces 13-1 to 13-4, 12-1 to 12-m are connected to the ISDN network 2 and An office line interface that performs incoming call control and has a function of analyzing the incoming call destination of an incoming call. 13-1 to 13-4 are terminal interfaces for connecting and controlling the extension telephones 3-1 to 3-4, and 14 is a control unit for controlling the switching circuit 11 or controlling various services such as incoming call control during communication. , 15 are storage units for storing various information necessary for the operation of the control unit 14. The control unit 14 controls the office line interface 12, the terminal interface 13, and the switching circuit 11 via the control line 16.
Further, the control unit 14 and the storage unit 15 have a terminal information management function and an incoming call notification control function. In particular, the control unit 14 stores, in a predetermined area of the storage unit 15, a terminal interface that is currently accepting a communication incoming call notification. A flag is set to manage the terminal interface that accepts the incoming call notification during communication.

Next, the operation of this embodiment will be described. I
When a call is input from the SDN network 2 to, for example, the office line interface 12-1, the office line interface 12-1 analyzes the destination of the call, and notifies the controller 14 via the control line 16 of the analysis. When the destination is the extension telephone 3-1, for example, the control unit 14
3-1 is controlled to send a call signal to the extension telephone 3-1. As a result, the extension telephone 3-1 responds by going off-hook. When the response is input via the terminal interface 13-1, the control unit 14 controls the switching circuit 11 to control the office line interface 12-1 and the terminal interface 13-1.
-1 is connected to form a communication path, and the extension telephone 3-1 enters a communication state.

Here, the terminal interfaces 13-1 to 13-1
3-4 is a group of interfaces that can receive an incoming call notification during communication.
Let 1 be its representative. Now, a call from the ISDN 2 is sent to the terminal interface 1 via the office line interface 12.
It is assumed that all of the terminal interfaces 13-1 to 13-4 are in the B channel busy state in a state in which all of the terminal interfaces 3-1 to 13-4 have received calls. That is, the extension telephones 3-1 to 3-1
It is assumed that all of 3-4 are busy. In such a state, when a new call from the ISDN 2 arrives at, for example, the central office interface 12-m, the central office interface 12-m.
m analyzes the destination of the call and sends it to the control unit 1
4 is notified via a control line 16. The control unit 14 determines that the destination is the extension telephone 3-1;
If the value is -1, the call arriving at the office line interface 12-m is kept in a calling state as it is, and the extension telephone 3-1 is notified of the incoming call during communication from the terminal interface 13-1. At the same time, the control unit 14 sets a flag "1" indicating that the terminal interface 13-1 has accepted the communication incoming call notification in the storage unit 15 as shown in FIG.

When a new call from the ISDN network 2 arrives at the central office interface 12-2, for example, in a state where the representative terminal interface 13-1 in the group accepts the notification of the incoming call during communication, The line interface 12-2 analyzes the destination of the call and notifies the control unit 14 of the destination via the control line 16. If the destination is for the terminal interface 13 in the group, the control unit 14 refers to the storage unit 15 and selects an interface that has not accepted the communication notification from the terminal interfaces 13-1 to 13-4. Is searched for based on the presence or absence of the flag shown in FIG. As a result, if 13-2 is found as a terminal interface that does not accept the incoming call notification during communication, the control unit 14 controls this terminal interface 13-2 to notify the extension telephone 3-2 during the call that the incoming call notification is being received. And the storage unit 1
In step 5, a flag "1" indicating that the terminal interface 13-2 has accepted the incoming call notification during communication is set. As described above, the control unit 14 controls the terminal interface 1 as described above.
When all of the calls 3-1 to 13-4 are busy with the B channel and the representative terminal interface 13-1 has accepted the incoming call notification during communication, a plurality of calls arriving one after another or simultaneously from the ISDN network 2 are being communicated. Control is performed such that a terminal interface that has not received a communication incoming notification in the group has not received the incoming notification.

Thereafter, for example, when the telephone call of the extension telephone 3-1 ends, the control unit 14 controls the switching circuit 11 to control the terminal interface 13-1 and the central office interface 12-m.
To control the terminal interface 13-1 to receive the call for the extension telephone 3-1 which has been kept waiting.

FIG. 3 is a diagram showing a method in which the control unit 14 selects a terminal interface for accepting an incoming call notification during communication. This example shows a case in which terminal interfaces 13 in a group that has not accepted the incoming call notification during communication are searched in descending order of extension number.

FIG. 4 is a diagram showing a method in which the control unit 14 selects a terminal interface for accepting an incoming call notification during communication. This example shows a case in which terminal interfaces 13 in a group that has not received the incoming call notification during communication are searched in ascending order of extension number.

FIG. 5 is a flowchart showing the incoming call notification processing during communication by the control unit 14 shown in FIG. A new call is input from the ISDN 2 to the line interface 12,
Extension telephone 3 whose destination is connected to terminal interfaces 13-1 to 13-4 in the group described below.
If it is -1 to 3-4, the control unit 14 proceeds to step 50.
1, terminal interfaces 13-1 to 13-13 in the group
-4 are all B-channel busy, the process proceeds to step 502, where it is determined whether the terminal interface 13 of the group can receive the incoming call notification during communication. Step 5
At 05, the processing is terminated. On the other hand, step 50
If it is determined in step 2 that the terminal interface 13 in the group can receive the incoming call notification during communication, the control unit 14 proceeds to step 503, and the representative terminal interface 13-1 transmits the incoming call notification during communication. It is determined whether it is in the receiving state. If it is not received, the process proceeds to step 504. If it is received, the process proceeds to step 506. In step 506, the control unit 14 determines whether or not any of the terminal interfaces 13-2 to 13-4 in the group has not received the communication incoming notification.
If not, the process proceeds to step 507 to disconnect the call and terminate the process. If there is, the process proceeds to step 508. In step 508, the control unit 14 controls the terminal interface that has not received the incoming call notification during communication searched by a predetermined method, and causes the extension telephone 3 connected to this terminal interface to output the incoming call notification during communication. Then, the terminal interface 13 is notified of the incoming call notification during communication, and the process ends. On the other hand, when the process proceeds to step 504, the control unit 14 controls the representative terminal interface 13-1 to cause the extension telephone 3-1 to output a communication incoming call notification,
The terminal interface 1 which represents the incoming call notification during communication
After receiving the data in 3-1, the process ends.

FIG. 6 is a schematic diagram showing an example of communication incoming call notification control for a group formed by gathering a plurality of terminal interfaces that can accept the communication incoming call notification of the present embodiment. In a state where all of the terminal interfaces 13-1 to 13-n in the group are busy with the B channel and the representative terminal interface 13-1 is accepting the communication incoming notification for the call from the user A, the user B and the user When there is an incoming call from C to the group, the terminal interface 13-2 accepts the incoming call notification during communication for the call from the user B, and the terminal interface 13-3 receives the incoming call notification during communication for the call from the user C. Is made. However, in the conventional control shown in FIG. 7, in a state similar to the above, in a state where the representative terminal interface 13-1 has already received the communication incoming notification for the call from the user A, the user B,
Even if there is an incoming call from the user C, the representative terminal interface 13-1 can no longer accept the incoming call notification during communication, and the incoming calls from the users B and C are disconnected.

According to the present embodiment, the terminal interfaces 13-1 to 13-4 in the group are all in the B channel busy state, and the representative terminal interface 13-1
When a new incoming call is input from the ISDN 2 to the local line interface 12 while the terminal is accepting the incoming call notification during communication, the control unit 14 refers to the storage unit 15 and receives the incoming call during communication within the group. A terminal interface that has not accepted the notification can be searched for, and control can be performed so that the searched terminal interface 13 accepts a communication incoming notification for the newly arriving call, so that the terminal interfaces 13-1 to 13- within the group can be controlled. Even if a plurality of calls are input to the group in sequence or simultaneously when all 4 are in the B-channel busy state, communication-incoming notification for these calls is sent to the terminal interfaces 13-1 to 13- within the group. 4 in order to reduce the number of incoming calls that are disconnected and perform efficient communication accordingly. Door can be.

[0018]

As described above, according to the private branch exchange according to the present invention , all the extension terminals in the receiving group
A new incoming call occurred during a call that is answering the incoming call
In such a case, the incoming call is placed in a waiting state, and
First sent to the display means of the first extension terminal in the called group
The display means of the first extension terminal receives the notification information.
If the notification information is not accepted,
The display means of the extension terminal in the called group is detected.
The notification information indicating that another incoming call has occurred during communication is sent to the display means of the extension terminal in the receiving group that has not received the notification information. When there is no call, even if an incoming call occurs, the trouble of making the calling side re-call without being disconnected immediately is eliminated, and the display means is notified so that the communicating person can terminate the communication. It can be expected that the operation of the system will be performed appropriately.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a private branch exchange according to the present invention.

FIG. 2 is a diagram illustrating a writing state of a flag indicating a terminal interface that has accepted a communication incoming notification set in a storage unit illustrated in FIG. 1;

FIG. 3 is a diagram showing a method in which the control unit shown in FIG. 1 selects a terminal interface that has not yet accepted a communication incoming notification.

FIG. 4 is a diagram showing another method in which the control unit 14 selects a terminal interface that has not yet accepted the incoming call notification during communication.

FIG. 5 is a flowchart showing a communication incoming notification process of the control unit shown in FIG. 1;

FIG. 6 is an exemplary view for explaining the operation of accepting a communication incoming notification when all terminal interfaces in the group shown in FIG. 1 are B channel busy;

FIG. 7 is a diagram illustrating a conventional operation when accepting an incoming call notification during communication when terminal interfaces in a group are all B-channel busy.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Private branch exchange 2 ... ISDN network 3-1-3-4 ... Extension telephone 11 ... Switching circuit 12-1-12-m ... Office line interface 13-1-13-4 ... Terminal interface 14 ... Control part 15 ... Storage Part 16: Control line

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-60-176395 (JP, A) JP-A-57-76988 (JP, A) JP-A-2-119364 (JP, A) JP-A-3- 50991 (JP, A) JP-A-4-56452 (JP, A) JP-A-3-21152 (JP, A) JP-A-60-74759 (JP, A) JP-A-2-10957 (JP, A) JP-A-61-107859 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04Q 3/58 106 H04M 3/42

Claims (4)

(57) [Claims] A communication is established by answering an incoming call.
Notification information that a new incoming call has occurred
A call group including a plurality of extension terminals including a display unit for receiving a notification, and an empty extension terminal that is not in communication in the call group when an incoming call to the call group occurs.
An incoming call control means for detecting and making an incoming call to the empty extension terminal; and receiving an incoming call to the incoming call group;
An empty extension terminal that is not communicating within the
If no extension terminal is detected and there is no idle state, the incoming call is kept in a ringing state and the first extension is set.
Check if the notification information for the terminal has been accepted
And the notification information to the first extension terminal is received.
If not attached, the table of the first extension terminal concerned
Sending the notification information to the first extension
When the notification information for the terminal is accepted
Detects extension terminals for which the notification information has not been accepted
In front of the extension terminal for which the notification information has not been received
And a notification control means for transmitting the notification information to the display means . 2. A notification control means, comprising:
When an incoming call occurs, all of the
The notification information is received by the display means of the line terminal.
2. The private branch exchange according to claim 1, wherein upon detecting that the incoming call has been received, the incoming call is disconnected . 3. The incoming call control means sets an incoming call in a ringing state.
In the waiting state held in
Detects whether or not an extension terminal has been detected.
2. The private branch exchange according to claim 1, wherein upon detection of the call, the incoming call in the waiting state is received by the extension terminal in the idle state. 4. The notification control means is provided for the first extension terminal.
If the notification information has been accepted, the second
The notification information for the extension terminal of
The notification to the second extension terminal.
If the information has not been accepted, the second extension end
Sending the notification information with respect to end of said display means, said
The notification information for the second extension terminal is accepted
If not, the extension for which the notification information has not been accepted
The terminal is detected and the notification information is not accepted.
2. The private branch exchange according to claim 1, wherein the notification information is transmitted to the display unit of the line terminal .