JPH01290357A - Telephone exchange - Google Patents

Abstract

PURPOSE:To acquire an office line trunk quickly by providing a means informing whether all office line trunks are busy or idle to an extension line. CONSTITUTION:When an incoming call comes to an exchange 30, it is discriminated whether an extension interface 34 is idle or an office line trunk circuit 36 is idle. When all the office line trunk circuits 36 are busy, a telephone set dialing '' is detected and its extension address is stored in a memory 32. Then a busy tone is sent from a tone signal generating circuit 37 to its extension address. The telephone set 5 receives the busy tone via the extension interface 19 and sends it from a handset 18 to the operator. When a control section 11 detects the busy tone, busy state is displayed on a display section 13. When the office line trunk circuit 36 is idle, a dial tone is sent to the extension. The telephone set 5 erases the display representing the busy state on the display section 13 by receiving the dial tone.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone exchange device that connects an extension line and a central office line.

[Conventional technology]

Conventionally, in this type of telephone switching equipment, there is a function called central line camp-on (or trunk queuing) as a service function for extension lines when all central central trunks are in use.

This service will be explained below.

This service first takes the extension telephone off-hook and dials "0" to make a call to the central office. At this time, since all central office trunks are in use, the private branch exchange (PBX) sends a busy tone (BT) to the extension telephone. When the extension operator hears BT, he dials the camp-on service special number (specific number), confirms the registration completion notification sound from the PBX, and goes on-hook. The PBX calls the extension when the central office trunk becomes vacant, and connects to the central office trunk when the extension telephone is taken off-hook by the operator.

[Problem that the invention is trying to solve] However,
In the conventional example described above, it takes several seconds, sometimes more than ten seconds, to complete the camp-on registration, which has the following drawbacks.

(1) Even if a vacant central office line trunk becomes available during camp-on registration, you may be able to make a central office line call (“0”) from another extension during registration.
” (dial), the registered extension cannot capture the central office trunk.

(2) Similarly, when a call is received from a central office line to a vacant central office trunk, the extension cannot capture the central office trunk.

As described above, there is an inconvenience in the past in that users who register for camp-on because they want to use a central office line trunk quickly may end up not being able to use it even if there is an empty trunk.

Furthermore, even if there is an empty trunk during operation, the user has to complete camp-on registration and wait until the ringtone sounds, resulting in poor operability.

[Means and operations for solving the problem] According to the present invention, in a telephone exchange device that connects an extension line and a central office line, a receiving means for receiving a signal to be transmitted from the extension line to the central office line; means for sending a busy signal to the extension if all central office line trunks are in use when the signal is received by the receiving means; By providing a means for notifying the extension when such occurrence occurs, the operator of the extension can immediately recognize that the trunk of the central office line has become vacant, and the operator of the extension can immediately recognize that the central trunk has become vacant, and can transmit from other extensions or receive from the central trunk. This allows the central office line trunk to be quickly acquired without the central office line being monopolized by the central office line.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system configuration diagram of an embodiment according to the present invention. In the figure, reference numerals 1 to 5 are telephones. Since the configuration of each telephone is the same, the telephone 5 will be explained below as an example.

In the telephone 5, reference numeral 11 denotes a control unit that executes control of the entire telephone according to this embodiment in addition to processing according to the manual input of keys from the keyboard 16, and reference numeral 12 denotes a memory that stores control data and the like for controlling the control unit 11. , 13 is a display unit that displays and outputs information such as that the trunk circuit, which is an interface with the central office line, is in a busy state. 15 is a key human interface that controls the interface with the keyboard 16, 16
is a keyboard consisting of a numeric keypad for entering telephone numbers, etc.
17 is an off-hook detection circuit that detects on-hook/off-hook of the handset 18; 18 is the handset; 19 is an extension interface that controls the line interface between the telephone set and the switching device 30; 20 is the control unit 11 and other components. This is an internal bus that connects the

30 is a switching device that controls connections between a plurality of office lines (external telephone lines) or connecting extension lines and a large number of extension telephones;
Generally private branch exchange (PBX) or key telephone (KTS)
) corresponds to the main body. In the exchange device 30, 31 is a central control unit that controls the entire exchange device 30 according to a program stored in a memory (ROM) 32, and 32 is a central control unit that controls the entire exchange device 30 in accordance with a program stored in a memory (ROM) 32; 34 is an interface between each connecting device and an extension interface for monitoring the status of each extension line; 35 is a switch line network for connecting/switching between the central office line (public line) and (extension line) connecting device; , 36 is a central office line trunk circuit that controls the interface with the central office line, and 37 is a busy tone (BT) sound source when the central office trunk circuit 36 is busy or a dial tone (BT) when the central office trunk circuit 36 is vacant. This is a tone signal generation circuit that is the sound source of the DT.

FIG. 2 shows an external view of the telephone set of this embodiment having the above configuration.

In FIG. 2, the display 13 is a seven segment display. This display 13 is not limited to a 7-segment type (it may also be a liquid crystal character display).In the keyboard 16, a telephone number key 16a1 for inputting a telephone number is used to indicate whether the central office line trunk is busy or not. It also includes a reservation key 16b for making a reservation.
The reservation may be made using the telephone number key 16a.

Further, 18 is a handset.

FIG. 3 is a control flowchart executed by the exchange device 30 of this embodiment. Note that this control is carried out by the memory 32.
The central control unit 31 executes the program according to the program stored in the computer.

First, in step S1, it is determined whether or not there is an incoming call to the switching device 30, and if there is an incoming call, step S1 is performed.
Proceed to 2. In step S2, it is determined whether the incoming call was placed on the extension line interface 34 or the central office line trunk circuit 36.

If the incoming call is from the central office line, the process advances to step S3 to perform connection processing with the designated extension line. Step S2
If it is determined in step S2 that the incoming call is on the extension interface 34, the process proceeds to step S4, where it is determined whether the connection destination is an extension. If the connection destination is an extension, step S
Proceed to step 3 to perform connection processing with the specified extension. In step S4, if it is determined that the connection is not to an extension line, that is, to a central office line, the process advances to step S5. Incidentally, when the operator of the telephone 5 uses the central office line, he/she may take the handset 18 off-hook and dial "0" from the numeric keypad 16a. When the switching device 30 receives this "0" from the telephone, it can determine that the telephone has selected the use of the central office line.

In step S5, it is determined whether all the office line trunk circuits 36 are in use. If the central office line is vacant, the process advances to step S6, and in step S6, a process for connecting the extension to the central office line specified by dialing is performed.

If it is determined in step S5 that all station lines are in use, the process advances to step S7. In step S7, the telephone from which "0" has been dialed is detected, its extension address is stored in the memory 32, and the process proceeds to step S8. Incidentally, storing the address in the memory 32 can also be realized by maintaining the connection with the telephone from which the call was received by the switch circuit 35. In step S8, a busy tone is sent to the telephone with the extension address stored in the memory in step S7, or to the telephone with which the extension is maintained.

This busy tone is generated from the tone signal generation circuit 37.

Further, the telephone set 5 receives this busy tone via the extension interface 19, and transmits it to the operator from the handset 18. Further, when the control section 11 detects this busy tone, it controls the display section 13 to display a heavy tone.

In step S9, it is determined whether or not the office line trunk circuit 36 is vacant. If there is a vacancy, step SI
Go to O and stop the busy tone, then step Sll
Proceed to.

In step Sll, a dial tone is sent to the extension. This allows the operator of the extension telephone to know that the busy state has been released.

Further, by receiving this dial tone, the telephone 5 erases the display indicating the busy state displayed on the display section 13.

In step 12, it is determined whether or not a connection request to the central office line has been received from the extension. If a connection request has been received, the process proceeds to step 56-2 to perform connection processing with the central office line. If there is no connection request, S] returns to 1 and sends out a dial tone. Note that this dial tone is interrupted when the telephone goes on-hook.

If it is determined in step S9 that there is no space in the central office line trunk, the process advances to step S13. Here, it is determined whether or not a central office line reservation signal has been received from the extension telephone. If not received, the process returns to step S9. If the reservation signal is received, the process advances to step S14. The telephone 5 is used to reserve a central office line using the reservation key 16b shown in FIG. You can also make a central office line reservation by dialing the Camp-on special number.

In step S14, it is determined whether or not the reservation setting is completed in the exchange device 30. Before the reservation setting is completed, it is determined in step S15 whether or not there is space in the central office line trunk, and if there is space, the process advances to step S10.

When the reservation setting is completed, the process advances to step S16, and the extension is notified of the reservation completion.

The telephone 5 that receives this notification can put the handset on hook.

Step S17 is a step for determining whether or not the central office line trunk becomes vacant after completion of the central office line reservation setting, and if the central office line trunk becomes vacant, the process proceeds to step S4.

According to this embodiment, when all the central office lines are in use, as soon as a central office line becomes vacant, it is notified that the extension has become vacant, so the operator can immediately know the vacant status. This allows for quick connection between the extension line and the central office line.

Furthermore, even if a central office line becomes vacant before the central office line reservation is completed, the operator can recognize that the central office line has become vacant, so that an incoming call from another extension or central office line cannot be canceled while the central office line is reserved. It is possible to prevent the central office line from being dedicated.

Also, in this embodiment, connection with one extension was explained, but if there is an incoming call from multiple extensions while all the lines are in use,
As soon as a central office line becomes vacant, it is possible to notify you of the availability in the order in which calls are received.

In this embodiment, a case has been described in which a telephone is connected as an extension, but it is also possible to connect a facsimile machine. In this case, by providing the facsimile machine with an automatic dialing function, it becomes possible to automatically send the document as soon as a central office line becomes available.

〔Effect of the invention〕

As explained above (according to the present invention), an extension operator can immediately recognize when a central office line trunk becomes vacant, and the central office line is not occupied by transmissions from other extensions or reception from the central office line. (It is possible to quickly acquire a central office line trunk.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment according to the present invention, and FIG.
The figure is an external view of the telephone set of this embodiment, and FIG. 3 is a call control flowchart of this embodiment. In the figure, 1--telephone, 11--control unit, ]2--
- Memory, 13...Display section, 15...Key manual interface, 16...Keyboard, 17...Off-hook detection circuit, 18...Telephone receiver, 19.34...
Extension interface, 30... Switching device, 31...
Central control unit, 32...memory, 35...switch circuit network, 36...office line trunk circuit, 37...tone signal generation circuit.

Claims (1)

[Claims] In a telephone switching device that connects an extension line to a central office line, there is provided a receiving means for receiving a signal to be transmitted from the extension line to the central office line, and a receiving means that receives a signal from the central office line, and all central office line trunks are in use when the signal is received by the receiving means. In this case, means for sending a busy signal to the extension, and means for notifying the extension if the office line trunk becomes vacant before the reservation of the office line trunk from the extension is completed. A telephone switching device characterized by: