JPH0244956A - Private branch exchange - Google Patents

Abstract

PURPOSE:To ensure the simultaneous calling function by interrupting an extension simultaneous call function to a busy extension being an object forcibly while an incoming trunk line is protected so as to apply simultaneous call. CONSTITUTION:Electronic key telephone sets 1a-1n are respectively connected to a channel network 3 via line circuits 2a-2n as extension telephone set terminals and the channel network 3 is connected to a trank line via office line trunk circuits 4a-4m. When an extension telephone set terminal being an object of a simultaneous call is busy with other extension telephone set terminal, the busy extension telephone set terminal is restored forcibly and when the extension telephone set terminal being an object of a simultaneous call is busy with a trunk line, the telephone set terminal of the busy opposite party is in holding and a simultaneous call is given to extension telephone set terminals being objects of the simultaneous call. Thus, while the trunk line receiving a call is protected, the simultaneous call is given even to busy extension telephone set terminals. Thus, the surely of the simultaneous call function is strengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a private branch exchange having an extension-calling function.

(Conventional Technique'#i) Recently, various service functions have been enhanced in electronic private branch exchanges, and one of these service functions is an extension-calling function.

Extension - simultaneous calling function - 4 out of 4 machines! This is a function that allows simultaneous calling (paging) to a plurality of I9 telephones from a telephone terminal or relay stand. - An electronic key telephone (hereinafter referred to as EKT) is used for the G terminal connected to the extension targeted for simultaneous calling;
This is done through the EKT's built-in public address system.

The EKT to be called out can be installed arbitrarily, for example, on a teletypewriter or the like.

After going off-hook, the phone of the party making the call is -
By inputting a special 'M number (special number) determined for executing the general paging function using the dial key, the general paging function can be started for the FKTs to be called.

At this time, - if the EKT to which the general paging is to be performed is not registered, the private branch exchange sends an overflow tone to the telephone terminal of the party making the general paging, and - to notify that the EKT to which the general paging is to be performed does not exist. Inform.

In addition, if all extensions to which simultaneous paging is to be performed are busy, the phone number to which simultaneous paging is to be performed (busy 1) indicates that it is currently impossible to perform simultaneous paging. Send at the end of A'r.

On the other hand, if there is an empty EKT among the FKl targets for simultaneous paging, a communication path is formed with the telephone group terminal on the side that performs the simultaneous paging only for that free EKT,
- Enables simultaneous calling.

(Problems to be Solved by the Invention) As mentioned above, in conventional private branch exchanges, simultaneous calling of extensions is not possible, but simultaneous calling is not possible for busy EKTs, and simultaneous calling is performed only for vacant EKTs. However, there is a problem in that the original requirement of reliably transmitting the information that requires simultaneous paging is not fully satisfied.

An object of the present invention is to provide a private branch exchange that can perform paging even to busy FKTs.

[Structure 1 of the Invention (Means for Solving the Problems) The present invention includes a first storage means for storing call parties for each extension telephone terminal, and a second storage means for storing call parties on hold for each extension telephone terminal. means and the first storage means to determine whether the other party on the call of the extension telephone terminal to be simultaneously called is an extension or a central office line, and if it is an extension, the extension of the other party is searched. The first means for restoring the extension telephone terminal is to search the second storage means to find the party on hold whose extension is to be called simultaneously, if the party on the call is on a central office line; If the other party does not exist, the central office line of the other party is put on hold, and if the other party on hold is an extension, after the extension telephone terminal of the other party on hold is restored, the other party's office line is put on hold. The present invention is characterized by comprising a second means.

(Function) When activating the function for simultaneous calling of all extensions, - the party on the call of the extension telephone terminal to which the simultaneous call is to be made is searched in the first storage means, and whether the party on the telephone call is an extension telephone terminal or not; For example, restore the other party's extension telephone terminal. However, if the other party on the call is a telephone terminal on the central office line side, the second storage means is searched for the other party on hold at the extension telephone terminal that is the subject of simultaneous paging, and if the other party on hold does not exist, the call is made. If the other party's central office line is put on hold, and the other party is using an extension telephone terminal, the other party's Fli! Restore the telephone terminal and place the other party's telephone line on hold.

Therefore, even if the extension targeted for simultaneous paging is busy, the extension paging function is forcibly activated for that extension.
The function is to call all at once. In addition, it is possible to make a call all at once while protecting the incoming station line.

(Example) Hereinafter, the present invention will be explained in detail based on examples.

FIG. 1 is a block diagram showing the configuration of an electronic private branch exchange to which the present invention is applied. In the figure, 1a to 1n are electronic key telephones (hereinafter referred to as EKT), and these are respectively inside I! Line circuits 2a-2 as telephone terminals
It is connected to the communication path network 3 via n. The communication path network 3 is connected to the office line via office line trunk circuits 4a to 4m.

In addition, this communication path network 3, line circuits 2a to 2
n and office line trunk circuits 4a to 4IIl are connected to a central control unit 6 via a control data bus line 5, and
data is transmitted and received between the above-mentioned centrally controlled at+device 6 which performs control operations using data stored in fH and device 7, and transmits and receives data to EKTs 1a to 1n and EKTs 1a to 1n via channel network 3.
It is configured to form a communication path between the KTs 1a to 1n and the office line.

The central TIA device 6 is capable of performing control for various services in addition to telephone exchange connections such as normal extension connections and single-station line connections, and the control content is based on the control program stored in the storage device 7. This is realized by

The storage device 7 is provided with a data memory group as shown in FIG. In FIG. 2, memory block MBI
is a data memory that stores data specifying EKTs to be called at once, and this data is set using, for example, a teletypewriter when setting up a call. The cheaters are registered in order from the beginning of the memory block MB1, and specific 1 ('FF' in this case) is stored in the empty area.

The memory block MB2 is a data memory for storing EKTs that can receive a general call among the EKTs registered in the memory block MB1 when the extension general call function is activated. This memory block MB
2 - Connecting the communication path to realize the simultaneous calling function.
The receiver is provided for the purpose of passing data to a module for processing such as disconnection and sending of terminal control commands to the EKT that receives the general call. - EKTs that can receive a general call are registered in order from the beginning of the same memory block MB2, and a specific value (here 'FF') is assigned to the empty area.
is memorized.

The memory block MB3 is a data memory that stores the parties to which the EKT is communicating, corresponding to each EKT. If there is no other party to talk to, a specific value (in this case 'FF') is stored corresponding to the extension.

Memory block MB4 is EKT's reserved partner.
This is a data memory that stores information in accordance with KT.

If there is no hold partner, a specific value (here “FF
”) is stored in accordance with EKT.

FIG. 3 is a flowchart showing the main operations of internal simultaneous call grouping to which the present invention is applied. In the same figure, “-extension n” that is subject to simultaneous paging refers to memory block MB.
It represents each extension registered in 1.

As shown in FIG. 2, EKTl is stored in memory block MBI as an extension to be called up.

When EKT2, EKT3, and EKT4 are registered, the third
This will be explained with reference to the flowchart shown in the figure.

First, the general call handler performs a predetermined keystroke after going off-hook in order to access the extension general calling function at the extension EKTO.

This key input is, for example, an operation such as manually inputting a special number for extension/general calling using dial keys (step 101).

After this operation is completed, the central control unit 6 checks from the beginning of the memory block MB, 1 whether or not the EKT to be called out is registered (step 102).

If the storage contents are 'FFF', that is, the extension to which the general paging is to be performed is not registered, an overflow tone is sent to the EKTO on the side that performs the paging (step 103).

In the example described here, it is assumed that extension EKT1 is registered at the beginning of memory block MB1. in this case,
First, by checking whether or not the storage contents corresponding to the extension EKTI (hereinafter referred to as DDl) in the memory block MB3 is "' F F ", it is determined whether or not there is a calling party for EKTl (step 104 ). If the stored content DD1 is "FF", it is determined that the other party of EKTl does not exist, and step 111, which will be described later, is executed. Next, if the stored content DD1 is not ``FF'', it is roughly determined whether the stored content DDI represents a central office line (step 105).

If the other party of EKTl is not a central office line (in other words, it is an extension line or relay console), the other party indicated by the above-mentioned sleep contents DD1 is restored, the communication path with EK 1-1 is cut off, and the above-mentioned memory contents are restored. DD1 is cleared by "FF" (step 108).

If the other party of the EKTl call is a central office line, check whether the EKTI-compatible record/old contents of memory block MB4 (hereinafter referred to as DHl) is 'F F' to determine if the EKTl is on hold. It is determined whether a partner exists (step 106).

If the above memory content DH1 is 'FF F', E
It is determined that the holding partner of KTl does not exist. In this case, processing is performed to put the EKTl call party indicated by the above-mentioned stored content DD1 on hold. That is, the communication path between the office line indicated by the memory content DD1 and the EKTl is cut, and the communication path between the office line indicated by the memory content DD1 and the EKTl is
Step 107) in which H1 is replaced with the above-mentioned contents DD1 and the stored contents DD1 are written as "'FF".

If it is determined in step 106 that the EKTI holding partner exists, it is determined whether the stored content DH1 indicates a central office line (step 109). If it is determined that it is a local line (or, if it is determined that it is not a local line (that is, an extension line) by executing step 112, which will be described later, then it is a loss), the hold/wait is restored and the above memory content DH1 is saved. F
F” (step 110), step 107
Execute.

After step 107 or step 108 is executed,
Alternatively, if it is determined in step 104 that the other party of EKTl does not exist, FEKTI is registered in memory block MB2 (step 111).

Next, by reading the memory contents of the area next to the registered area of FKTl in the memory block MB1 and determining whether or not the same memory contents are 'FF F'',
- Determine whether the processing from step 104 has been completed for all EKTs to be called simultaneously (step 112). In this example, the data indicates EKT2, not the same memory content "F F", so next EKT
2, the processing from step 104 is executed. In this way, when the EKT 3 and EKT 4 years old have finished determining the calling party/on-hold party and executing the process, next,
It is determined whether an extension is registered in memory block MB2 (step 113). If EKT is not registered in memory block MB2, that is, EKTI~E
If all of the KT4's are holding the central line and are talking to the central line, - send a busy tone to the EKTO on the side that performs general paging (step 114), indicating that general paging is not possible. Extension - Notify the general call handler.

If EKT is registered in memory block MB2,
A communication path is established between the EKT registered in the same memory block MB2 and the EKTO on the side that performs the simultaneous call (step 115), and the EKTO is placed in a state where the simultaneous call is possible.

Table 1 shows the main processing contents regarding forced interruption for each combination of the calling party and the holding party who are the targets of simultaneous paging in this embodiment.

Table 1 Note that in the above embodiment: - EKT to be called out
If the other party is on a central office line, the central office line is put on hold, but if a relay stand is connected to the private branch exchange,
By performing the process of transferring the same station line to the relay stand, it is possible to realize forced interruption of extension-to-all paging.

[Effects of the Invention] As explained above, according to the present invention, - When the extension telephone terminal that is the target of simultaneous paging is in a call with another line telephone terminal, the extension telephone terminal of the other party is forcibly called. When the call is restored and a call is in progress to the central office line, the telephone terminal on the other party's central office line is put on hold, and then the call arrives at the private branch exchange in order to perform a simultaneous ringing to the extension telephone terminals that are the target of simultaneous ringing. While protecting the office line, simultaneous paging can be performed not only to unoccupied extension telephone terminals but also to extension telephone terminals that are in use, and - the reliability of the simultaneous paging function can be strengthened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a private branch exchange according to the present invention, and FIG. 2 is a diagram showing the structure of a memory for storing information used for controlling the extension-paging function in the embodiment. ,
FIG. 3 is a flowchart showing the control flow of the extension-general paging function in the embodiment. 1a-1n...Electronic key telephone (EKT), 2
a to 2n... line circuit, 3... call path network, 4a to 4n... trunk circuit, 5... 1111
1 data bus, 6...central control unit, 7...2 constant devices.

Claims (1)

[Scope of Claims] A simultaneous calling function in which a plurality of extension telephone terminals having a loudspeaker function are connected, and a pre-registered extension telephone terminal among these extension telephone terminals is called simultaneously from any other extension telephone terminal. In a private branch exchange equipped with: a first storage means for storing call parties for each extension telephone terminal; a second storage means for storing call parties on hold for each extension telephone terminal; and searching the first storage means. to determine whether the other party on the call with the extension telephone terminal targeted for simultaneous ringing is an extension telephone terminal or a central telephone terminal, and if it is an extension telephone terminal, the extension telephone of the other party is called. A first means for restoring the terminal; and if the other party is a telephone terminal on a central office line, the second storage means is searched to find the party on hold of the extension telephone terminal to be subjected to simultaneous ringing; If this does not exist, the telephone terminal of the above-mentioned party's central office line is put on hold, and if the party on hold is an extension telephone terminal, the telephone terminal of the extension of the party on hold is restored, and then the telephone terminal of the central office line of the above-mentioned party is put on hold. and a second means for holding a telephone terminal.