JPS62242456A - Calling system for telephone system - Google Patents

Abstract

PURPOSE:To call an external telephone set from the extension telephone set side without reorigination from the external telephone set side by controlling a private branch exchange by respective calling means on the terminating and originating sides and calling the extension telephone set and the external telephone set registered in a memory. CONSTITUTION:When the extension telephone set 4 is talking, a number input request means 12 drives a voice output means 5 to request the input of the telephone number of an originating side telephone set 1 and a specific number. A control means 13 stores a subscriber's number and the specific number in a memory M. When the control means 13 drives the voice output means 5 and sends a service completion user to the originating side telephone set 1, the originating side hooks on its receiver and communication is temporarily disconnected. When the extension telephone set is not in communication, a terminating side calling means 15 controls the private branch exchange 3 to call the extension telephone set 4 and reads out the subscriber telephone number of the originating side telephone set 1 stored in the memory M to call the telephone set 1.

Description

[Detailed description of the invention] [Industrial application field] It is related to the formula.

[Conventional technology]

FIG. 3 shows a telephone system according to the prior art.

In the figure, l indicates a PB telephone as an external telephone. The P
A B telephone 1 is accommodated in a telephone switching network 2.

Further, 3 is a private branch exchange connected to the telephone exchange network 2,
The private branch exchange 3 accommodates a plurality of extension telephones 4 connected thereto. Here, the private branch exchange 3 is installed in a company or a factory, and a plurality of private branch exchanges 3 are specified in the telephone switching network 2. Here, between the PB telephone 1 and the telephone switching network 2,
The telephone exchange network 2 and the private branch exchange 3 are connected by an external line A, and the private branch exchange 3 and the extension telephone 4 are connected by an internal line C. There is.

Next, based on FIG. 4, a conversation between the PB telephone 1 and the extension telephone 4 will be explained.

First, in step S1, the PB telephone 1 inputs the telephone number of the extension telephone 4.

Then, the telephone switching network 2 determines the private branch exchange 3 that accommodates the extension telephone 4 based on this telephone number and requests a connection.In step S2, the private branch exchange a3 determines the extension telephone 4 based on this connection request. and request a connection.

Next, in step S3, if the extension telephone a4 is busy, the private branch exchange 3 outputs the voice signal P, and the voice output means 5 transmits a busy tone to the PB telephone a1. Then,
In step S3, when the PB telephone l learns from the busy tone that the extension telephone a4 is busy, it ends the communication in step S4.

On the other hand, if the extension telephone 4 is not in use in step S3, the private branch exchange 3 connects the PB telephone 1 to the extension telephone 4 and makes a telephone call in step S5.

(Problem to be Solved by the Invention) However, in the conventional telephone system, if the other party's extension telephone is busy, the calling party's PB telephone must temporarily terminate the communication and then make the call again. There was a problem.

Therefore, the present invention has been made in order to solve such problems, and provides a calling method for a telephone system that can call back the calling party's PB telephone when the desired extension line becomes empty. With the goal.

[Means for solving problems]

The present invention provides a private branch exchange with a called side paging means and a called side paging means which are activated after an external telephone inputs each call number and once disconnects the call line, and the called side paging means controls the private branch exchange and calls the extension telephone corresponding to the extension telephone number registered in the memory, and the calling side calling means controls the private branch exchange and calls the external telephone number registered in the memory. It is designed to call an external telephone that corresponds to the number.

[Effect]

The called side calling means controls the private branch exchange to call the extension telephone corresponding to the extension telephone number, and the calling side calling means controls the private branch exchange and calls the external telephone corresponding to the external telephone number. Therefore, each time the called party's extension telephone automatically returns the call to the external telephone.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. Note that the same components as those in the prior art are given the same reference numerals, and the description thereof will be omitted.

11 indicates the main private branch exchange. The main private branch exchange 1
1 has all the configurations and functions of the private branch exchange 3 of the prior art.

It is also assumed that the telephone number and special number of the extension telephone 4 on the called side are input from the PB telephone 1 (hereinafter referred to as the calling side telephone 1) in the present invention.

Here, the special number is a signal for conveying to the called party that the calling party desires a callback connection.

The call-back connection means that the called party calls the calling party.

However, ■2 indicates a number input requesting means that operates together when the extension telephone 4 is currently in a call, that is, when the voice output means 5 is activated to notify the calling party of this with a busy tone. . The number input request means IL is driven by a voice signal P output from the private branch exchange 3 to the voice output means 5 when the extension telephone a4 is busy. When the number input requesting means 11 receives the audio signal P, it outputs the first drive signal Q to the audio outputting means 5. Here, the first drive signal Q is
This is a signal requesting the calling phone 4i1 to input the subscriber number of the calling phone 1 and the special number, and the audio output means 5 inputs the first drive signal Q. Then, a request tone is output to the calling side telephone m1. The requested sound has a different tone from the busy sound.

However, 13 indicates control means. When the control means 13 detects that the special number has been input, the control means 13 stores the telephone number of the extension telephone 4 and the telephone number of the calling telephone 1 in the memory M, and also outputs the voice output means 5. A voice output signal S is output to the caller, and a service completion tone is output to the calling party.

Here, the service completion tone is a signal for informing the calling party that the telephone number of the calling telephone 1 and the telephone number of the extension telephone 1 have been stored in the memory M. The control means 13 functions as an input means for inputting each of the above numbers.

Further, 14 indicates a detection means. The detection means 14 determines whether or not the calling side telephone l has hung up the receiver after the telephone number of the extension telephone l and the telephone number of the calling side telephone m1 are stored in the memory M, that is, the calling side This is to detect whether or not communication from the side telephone l side has been once interrupted. this is,
- For example, it can be detected by inputting the volume output signal S from the control means 13 and detecting a change in line voltage via the private branch exchange 3. At this time, the detection means 14 drives the called side calling means 15.

The called side calling means 15 uses an extension telephone Ja corresponding to the telephone number of the extension telephone 4 stored in the memory 13.
4. This is the called side calling means 15.
controls the private branch exchange 3, so that the extension telephone a
You can call 4.

The called side paging means 15 drives the calling side paging means 16 when the extension telephone 4 answers. Whether or not the extension telephone 4 has responded can be detected, for example, by detecting the line voltage of the inner recessed NIAC via the private branch exchange 3.

The calling side paging means 16 reads the telephone number of the calling side telephone 1 stored in the memory M, and controls the private branch exchange 3 to call the calling side corresponding to the telephone number. a1 is called.

Next, the operation will be explained based on FIG. 2.

Note that steps S1 and S2 are the same as in the prior art.

Then, in step S3, the extension telephone 4 is currently
Assume that you are on a call. Then, similarly to the prior art, the voice output means 5 outputs a busy tone to the calling side telephone 1. Immediately after this, the number input request means 12. is step Sl
At 1, the voice output means 5 is driven to output a request tone to the calling party, thereby requesting the calling party to input the telephone number and special number of the calling party's telephone 1.

Next, in step S12, the calling side telephone 1 inputs its own telephone number and special number in order to respond to the above request.

Then, in step S13, the control means 13
stores the subscriber number and special number in the memory M. After that, in step S14, the control means 13
drives the voice output means 5 to send a service completion tone to the calling telephone 1. Then, the calling party determines that the callback request has been completed and hangs up the telephone. As a result, communication is temporarily cut off in step S15.

Next, in step S16, when the detection means 14 detects that the calling party telephone 1 is hung up,
In the next step S17, the extension calling means 15 determines whether the extension telephone 4 is in use. When the call is not in progress, the called side calling means 15 controls the private branch exchange 3 to call the extension telephone 4 in the next step 318.

After that, in step S19, the calling side calling means 16
reads the subscriber telephone number of the calling telephone l stored in the memory M and controls the private branch exchange 3 to call the calling telephone l.

Thereafter, in step S20, a call is made between both telephones 1.4.

On the other hand, if it is determined that the extension telephone 4 is not in use in step S3, a normal telephone call is performed in step S21.

In the above embodiment, the P
A DIL (direct inline) method in which the subscriber number of the private branch exchange corresponds to the extension telephone is shown as a method for directly receiving a call from telephone B to an extension telephone housed in a private branch exchange connected to the telephone exchange network. However, once the private branch exchange responds, the connection is made to the corresponding extension telephone using the extension number sent from the PB telephone.
``rl True DID (Direct In Dial) system also provides the same effects as the above embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, the called side calling means reads the extension number from the memory and controls the private branch exchange to call the extension telephone corresponding to the extension telephone number, and the agricultural calling side calling means reads the external telephone number from the memory and controls the private branch exchange to call the external telephone corresponding to the external telephone number, so that the extension telephone on the called side automatically calls back the external telephone.

Therefore, when the extension telephone is busy, the extension telephone can call the external telephone without having to call again from the external telephone.

[Brief explanation of drawings]

1 and 2 are related to the present invention, FIG. 1 is a configuration diagram, FIG. 2 is a flow diagram, and FIGS. 3 and 4 are related to the prior art,
FIG. 3 is a configuration diagram, and FIG. 4 is a flow diagram. DESCRIPTION OF SYMBOLS 1... PB telephone (external telephone), 3... Private branch exchange, 4... Extension telephone, 13... Control means (input means), M... Memory, 15... Called side calling means, 1
6... Calling side calling means. Agent: Masuo Oiwa (and 2 others) Figure 1 16 --- Trap injury 1 Shoko Kon'@2 Figure 1

Claims (1)

[Scope of Claims] Comprising an external telephone and a private branch exchange connected via a telephone switching network, and a plurality of extension telephones housed in the private branch exchange, these external telephones or extension telephones can communicate with each other's telephones. In a telephone system in which a number is entered to call the other party's telephone via the telephone exchange network and the private branch exchange, and a call is made between these two telephones, when the extension telephone is busy, the telephone an input means for receiving and inputting a special number indicating that the external telephone requests a callback from the extension telephone; an external telephone number of the external telephone; and an extension telephone number of the extension telephone; The private branch exchange is equipped with a memory for inputting numbers and extension telephone numbers, and a called side calling means and a calling side calling means that are activated after the external telephone inputs each of the above numbers and once disconnects the call line. , the called side paging means controls the private branch exchange to call the extension telephone corresponding to the extension telephone number in the memory, and the calling side paging means controls the private branch exchange to call the extension telephone corresponding to the extension telephone number in the memory, and the calling side paging means controls the private branch exchange to call the A calling method for a telephone system, characterized in that an external telephone corresponding to the external telephone number stored in memory is called.