JPH0730938A - External line transfer method and external line transfer device - Google Patents

Abstract

PURPOSE:To simplify the operation by connecting one of plural key telephone sets to a transfer use external trunk line connecting to a key telephone set connection terminal with a predetermined DTMF signal so as to transfer a call externally from the optical telephone set. CONSTITUTION:A transfer use external line station 5 is connected to a master set 2 in a key telephone set 4 comprising the master set 2 and a key telephone set 3 connecting to the master set 2 in the external line transfer device 1. Any key telephone set 3 receives a call from a receiver. When it is required to transfer a phone call externally, the received telephone set 3 acts like a transfer source and sets to a holding state by the operation of the telephone set 3. Then the telephone set 3 sends a DTMF signal for the connection to the transfer external line station 5. Then dialing is made to a party receiving the transfer call to make talking with the transfer destination and a handset of the telephone set 3 is hooked on, then the sender source and the transfer destination are connected and the transfer is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method and apparatus for transferring a station line to a transfer destination by means of a key telephone of a transfer source which receives an external line.

[0002]

2. Description of the Related Art Conventionally, a so-called transfer device that transfers a call received from a station line to the outside is such that one outside line office line connected to the transfer device is transferred to a transfer destination telephone received by the transfer device. It has a structure of transferring by succession. In other words, by sending the source and destination through the transfer device,
This is a system in which two external lines, a sender and a transfer device, and a transfer device and a transfer destination, are connected so that the sender and the transfer destination can talk directly.

As a function of the transfer device, for example, there is a function of automatically connecting a call received from a caller to a specific transfer destination or manually connecting to an arbitrary transfer destination.

[0004]

However, the conventional transfer device has a drawback that only one external line can be connected to the transfer device for receiving an incoming call. this is,
This is because when one caller is making a call to the transfer device, the other caller is always busy.

Therefore, since the frequency of use of telephone is increasing and the number of telephone users who are laying two or more outside lines is increasing as in today's day, the function of the conventional transfer machine cannot be used. It was the current situation.

Further, in the conventional transfer machine, when selecting and transferring an arbitrary transfer destination, the transfer could not be performed without manually operating the transfer machine main body. For this reason, it is necessary to go to the installation place of the transfer device for operation, or to place a switch on the transfer device for operation, which is a major drawback in terms of operation and labor costs.

[0007]

The inventors of the present invention have been able to achieve the present invention as a result of earnest research in view of the above-mentioned various points, and the feature thereof is that in the invention of the method,
It is composed of a plurality of key telephones connected to a plurality of outside line offices and a main device for controlling these, and enables extension transfer by calling one of the key telephones with another DTMF signal. In the key telephone apparatus, the operation of the one key telephone called from any one of the central telephone lines causes a predetermined loop from the one key telephone in a state where the loop of the central telephone line is held in the hold loop circuit in the main apparatus. By transmitting the DTMF signal, the one button telephone is connected to the transfer outside line office line connected to the other button telephone connection terminal, and after the outside telephone call to the third party by the one button telephone, the main telephone The holding loop in the device is released, and the outside line office line is transferred to the outside line office line for transfer. Further, in the invention of the device, a plurality of key telephones connected to a plurality of outside line office lines A key telephone device that is configured by a main device that controls them, and that enables extension transfer by calling one of the key telephone devices to another button telephone device with a DTMF signal. The transfer external line is connected to the connection terminal.

The term "outside line" as used herein refers to a line which is wired in a company or a general household and connects with a telephone station, and a telephone is connected by connecting a telephone to the terminal of this line. It refers to a telephone call that can be made through a station.

The conventional transfer device is directly connected to the outside line and automatically or manually connects the transfer destination and the transmission source so that both parties can talk directly. In the present invention,
Connect this external line to the main unit of the key telephone device. This is similar to the normal connection method. The number of external lines connected to the main device may be one or two or more. A key telephone is connected to the main unit, and the number of connection is equal to or more than the number of office lines. Further, the external telephone line for transfer is connected to the key telephone connection terminal of the main device, but this may be one or two or more. The outside line office line for transfer may be directly connected to any one of the key telephone connection terminals of the main unit, or may be connected through the main unit. In the former case, a station line can be secured when transferring to an outside line, and in the latter case, the main device can automatically search for an empty line and transfer to an outside line.

The "button telephone" is a general telephone marketed by a home electric appliance maker or a telephone company.
The function and form are not particularly limited as long as the DTMF signal can be transmitted. The DTMF signal represents a numeral by a combination of two frequencies in the voice frequency band and is a signal used for a touch-tone telephone, but it may be a telephone with a PB conversion tone function. The key telephone device can call another key telephone by the DTMF signal transmitted from this telephone, so-called extension transfer. Further, the main device to which the key telephone is connected may be any device provided with a switch that is activated by a hold signal sent from the key telephone or a call signal that calls another key telephone when the extension is transferred. Generally, a hooking operation of a key telephone causes an outside line to be held and connected alternately. For example, in the case of extension transfer, after hooking and holding the one-line telephone that has received the outside line, a predetermined DT is sent from the one-button telephone.
Send an MF signal to call another desired key telephone. Then, the extension is transferred and the extension of the extension is performed by hooking the one key telephone.

According to the present invention, by connecting an external line for transfer to the main unit of such a key telephone device, it is possible to transfer to an external third party. The transfer external line is connected to one of the key telephone connection terminals of the main unit. Therefore, when an outside line received by any one of the key telephones is transferred to the outside, the person who receives the one button telephone puts the outside line on hold and then sends out a predetermined DTMF signal. Connect the key telephone to the transfer external line and call the other party to be transferred. When the receiver is notified that the transfer is to be performed and the receiver is on-hook, the sender and the transfer destination are automatically connected and the transfer can be performed. This means that the external line transfer can be performed in the same manner as the internal line transfer. Of course, when transferring to an outside line, it is necessary to dial the telephone number of the transfer destination.

When a call is made between the caller and the callee by connecting to the transfer external line, the call may be difficult due to the attenuation. For this reason, it is preferable to separately provide an amplification repeater for the transfer external line.

Further, according to the present invention, when a telephone received from a caller is transferred to an outside line, a dial tone is sent when the transferor sends a DTMF signal and connects to the transfer outside line office line. May be. This is done by connecting the DC power source when the transfer source telephone is connected to the transfer outside line office line. That is, by inputting a direct current, the direct current loop is closed and a dial tone is sent out to inform that the external line for transfer is connected.

Furthermore, in the present invention, a function of recalling the transfer source from the transfer destination may be added after the transfer is once performed to the outside. In this case, the transfer source is not limited to one button telephone set transferred to the transfer destination, but refers to a button telephone set that can be arbitrarily selected by sending a desired DTMF signal from the function of the main device. In order to call back the transfer source, it is first necessary to hold the outside line of the transmission source in the main device by an operation from the transfer destination. Therefore, for this purpose, a signal for closing the holding circuit in the main unit is sent. Generally, the same signal as the hold signal from the key telephone connected to the main unit is transmitted. In the present invention, a DTMF decoder is connected to the transfer outside line office line, and this decoder receives a preset DTMF signal and activates the hold signal transmission relay to hold the outside line from the source. In this manner, after the transfer destination holds the DTMF signal, a predetermined DTMF signal is transmitted to call the desired transfer source telephone. Then, by transmitting the DTMF signal again at the transfer destination and canceling the hold, the transmission source and the transfer source are connected and it becomes possible to talk.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a schematic diagram showing a connection state of an external line transfer device 1 according to the present invention. The outside line transfer device 1 is a key telephone device 4 composed of a main device 2 and a key telephone 3 connected to the main device 2, in which a transfer outside line 5 is connected to the main device 2. The transfer external line 5 in this example is connected to the key telephone connection terminal of the main unit 2, and is connected to the central line 6 via the main unit 2. That is, the two button telephone connection terminals are connected to each other. Therefore, one of the two button telephone connection terminals is connected to the predetermined DTMF from the other button telephone 3.
By calling with a signal, you will be connected to an outside line. In this case, the main unit 2 automatically connects to the idle line. However, if all the outside lines are used, it cannot be transferred to the outside. Therefore, as shown in FIG. 2, the transfer outside line office line 5 may be connected without passing through the main unit 2.

A method of using the outside line transfer device 1 will be described. First, one of the key telephones 3 receives a call from a caller. When it is necessary to transfer the caller's phone to the outside, the received key telephone 3 serves as the transfer source and is put on hold by the operation of the key telephone 3. This operation is generally performed by pressing the hook button of the telephone, but it is also possible to press a hold button provided elsewhere. After the call is put on hold, a DTMF signal is transmitted from the key telephone 3 to transfer the external line 5 for transfer.
Connect with. Then, after dialing the person to be transferred and talking to the transfer destination, the receiver of the key telephone 3 is hooked on-hook, so that the source and the transfer destination are connected and the transfer is completed.

FIG. 3 shows another embodiment of the present invention, in which a dial tone is sent out at the same time when an address to which the transfer outside line office line 5 is connected is called from one key telephone 3 with a DTMF signal. It was done like this. this is,
This is done by sending a predetermined DTMF signal to connect to the transfer external line 5 and at the same time actuating the DC input relay 7 to connect to the DC power supply.

FIG. 4 shows still another embodiment of the present invention, in which a telephone as a caller is transferred to a transfer destination and then the call is returned from the transfer destination to the transfer source.

This is as shown in FIG.
The holding relay 9 is operated by the DTMF decoder 8 provided in the above, and the disconnection signal is transmitted. In this example, the same signal as the hooking signal is sent by sending a disconnection signal of 500 ms to 750 ms. That is, a signal equivalent to a signal for activating the hold of the main device 2 may be sent to the main device 2 by a relay that operates with a DTMF signal from the transfer destination telephone.

Therefore, when the caller wants to talk with the caller again, the callee sends a predetermined DTMF signal (0 and # in this example) to activate the hold relay 9 to call the caller of the caller. Put on hold. Then, a DTMF signal is transmitted to call an arbitrary transfer source. At this point, the transfer destination and the transfer source can talk. Further, by hooking the receiver of the transfer destination on-hook, the call between the sender and the transfer source becomes possible.

[0022]

As described above, since the external line transfer method according to the present invention can be transferred to the outside in the same manner as the case of the extension transfer, it can be transferred from any telephone to the outside. Becomes extremely easy. In the outside line transfer device, since a plurality of outside line office lines can be connected, even if one outside line office line is being transferred, it can be received by another outside line office line. Further, by adding a call back function that can be put on hold by sending a DTMF signal from the transfer destination, it becomes possible for the caller, the transfer destination, and an arbitrary transfer source to alternately talk.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a device of the present invention.

FIG. 2 is a schematic view showing another example of the device of the present invention.

FIG. 3 is a schematic diagram in which a DC input relay is provided in the device of the present invention.

FIG. 4 is a schematic diagram in which a holding relay is provided in the device of the present invention.

[Explanation of symbols]

 1 External line transfer device 2 Main device 3 Button telephone 4 Button telephone device 5 External line for transfer 6 Station line 7 DC input relay 8 DTMF decoder 9 Hold relay

Claims (6)

[Claims] 1. An apparatus comprising a plurality of key telephones connected to a plurality of outside line office lines and a main device for controlling these, by calling one of the key telephones to another key telephone with a DTMF signal. In a key telephone device capable of extension transfer, by operating one key telephone called from any one of the office lines, the holding loop circuit in the main device holds the loop of the station line, By transmitting a predetermined DTMF signal from the key telephone, the one key telephone is connected to the transfer outside line office line connected to the other key telephone connection terminal, and the one key telephone makes an outside call to a third party. After that, the holding loop in the main device is released, and the outside line office line is transferred to the outside line office line for transfer. 2. The outside line transfer method according to claim 1, wherein the transfer outside line office line connected to the key telephone connection terminal is connected via a main unit. 3. A hold signal sending relay is activated by sending a DTMF signal from an outside line transfer destination by a DTMF decoder provided on a transfer outside line office line connected to a key telephone connection terminal, and a hold inside the main unit is held. The outside line transfer method according to claim 1 or 2, wherein after the loop is closed, any one of the key telephones connected to the main device is called by transmitting a predetermined DTMF signal. 4. A plurality of key telephones connected to a plurality of outside line office lines, and a main device for controlling these, and by calling one of the key telephones to another key telephone with a DTMF signal. An outside line transfer device, wherein an outside line office line for transfer is connected to a key telephone connection terminal of the main device in a key telephone device capable of extension transfer. 5. The outside line transfer device according to claim 4, wherein the transfer outside line office line connected to the key telephone connection terminal is connected through a main unit. 6. The transfer outside line office line connected to the key telephone connection terminal is provided with a DTMF decoder and a hold signal sending relay operated by the DTMF decoder. Outside line transfer device.