JPS63129756A - Telephone terminal equipment - Google Patents

Abstract

PURPOSE:To prevent a telephone line from being closed uselessly by opening a closed line at present and switching it to other line when the line is switched before a dial signal is sent. CONSTITUTION:After an external line 1 is closed and a dial signal is sent from a dial sending means, when an extension is designated by an extension selective button 14, the external line is held by a holding means 5 and the extension is switched. If the extension is designated by the extension selection button 14 before the dial signal is sent by the dial sending means, it is switched to the extension without holding. Thus, when the talking with other party by the extension tentatively during the calling, the convenient function of changeover to the extension while holding the external line in use at present automatically through one operation is not lost and the useless closing of the telephone line having no intension of use is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a telephone terminal device capable of connecting a plurality of lines.

2. Description of the Related Art Telephone terminal devices have been used in the past that can be connected to public telephone lines and extension lines, and can be used as telephones and intercoms. In order to make the operation of such telephone terminal equipment as simple as possible, the public line is given a higher priority than the extension line, and a switch is set to select the telephone line when making a call. The telephone line is automatically connected to the phone by simply lifting the handset (off-hook) without any operation, and when trying to talk to an extension, first specify the extension using the telephone line selection switch and then switch the handset. It is configured so that when you pick it up (go off-hook), the extension line is connected and you can make a call. Furthermore, if you are talking to someone using a public line and want to put the other party on hold and use an extension to talk to someone in another room, you can switch between public lines by simply operating the extension selection switch. The system is configured to automatically put the call on hold and then switch to the extension to prevent an accident in which the call is interrupted by accidentally opening the public line that is currently in progress.

Problems to be Solved by the Invention However, with the above-mentioned telephone terminal device, when attempting to make a call to an extension, if you accidentally off-hook the handset first and then operate the switch to specify the extension, , First, the public line is temporarily closed, and in that state, the switch that specifies the extension is operated, so the public line is put on hold, and if the user does not notice this state, it will not work until the user puts the handset on hook. This has the problem that the public line remains closed unnecessarily, and even if an attempt is made to make a call from the public line to this line, the line becomes busy, making it impossible to make a call.

The present invention has been made in view of the above-mentioned prior art, and allows users to automatically connect to a specific line by simply clicking the handset without having to specify a line using a line selection switch, and temporarily switch to another line during a call. Even when talking with another person, the convenient function of automatically putting the line currently in use on hold and switching to another line with one operation is not lost.
To provide a telephone terminal device that prevents unnecessary closing of a telephone line that is not intended to be used.

Means for Solving the Problems In order to achieve this object, the telephone terminal device of the present invention sends out a dialing signal by the dial sending means after closing the selected line, and then specifies another line by the line selecting means. If the selected line is put on hold by the hold means and then switched to another line, and if another line is specified by the line selection means before the dial sending means sends out the dial signal, the line selected by the hold means is switched to another line without being put on hold. and control means for controlling switching to the line.

Effect With this configuration, if you switch the line after sending a dial signal, the currently closed line will be put on hold and then switch to another line, and if you switch the line before sending the dial signal, the current The closed line will be opened and switched to another line.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the main parts of a telephone terminal device in an embodiment of the present invention. In FIG. 1, 1 is a public line, and 2 is an extension used as an intercom. 3 is an external line incoming detection means for detecting an incoming signal coming from the public line 1; 4 is an extension incoming detecting means for detecting an incoming signal coming from the extension 2; 5 is turned on and off by a control signal. Holding means for holding the public line 1, consisting of a switching means 5a and a resistor 5b; 6, a line relay for selectively connecting the device to the public line 1 or extension 2; 7, closing the line. First thing to do
A second contact 7a connected to the control means 17 to be described later
A hook switch 8 having a contact point 7b is dial sending means for sending a dial signal to the line, and is composed of a switching element such as a transistor or a relay. 9 is an interface transformer; 10 is a communication circuit that amplifies the receiving signal coming from the line and the sending signal sent to the line; 11 is a transmitter provided in the handset;
2 is a receiver provided in the handset; 13 is an external line selection button that is operated when connecting this device to public line 1; 14 is an extension selection button that is operated when connecting this device to extension 2; 15 Reference numeral 16 indicates a dial button for inputting a dial, and 16 indicates a timer which starts operation in response to a control signal and generates an output signal after a predetermined time, which is set to 5 seconds in this embodiment. Reference numeral 17 denotes a control means for controlling the entire apparatus, and is composed of a microcomputer.

Further, FIG. 2 is a flowchart showing the operation of this device.

The operation of the telephone terminal device configured as described above will be explained below. This device checks whether or not there are incoming calls from public line 1 and extension 2 (STEP 1.5) in the standby state.
TEP 2), the operation status of the outside line selection button 13 and the extension selection button 14 (STEP 3.5 TEP 4), and the state fl of the hook switch 7 (STEP 5) are monitored. When the external line incoming call detection means 3 detects an incoming call from the public line 1lI11, the process advances to 5TEP6, and when the extension incoming call detection means 4 detects an incoming call from extension 2, the process advances to 5TEP6.
Proceeds to P7, when the operation of the external line selection button 13 is detected, proceeds to 5TEP5, and when the operation of the extension selection button 14 is detected, proceeds to 5TEP7, where the hook switch 7 is in the off-hook state (first and second contacts 7a % When 7b is in the on-hook state, the process advances to 5TEPIO, and if the on-hook state remains, the process returns to 5TEP1.

In 5TEP6, the control means 17 is an internal register ■r
Set LFJ (logic level “I J”) L/te5
Proceed to TEP5.

At step 5TEP7, the control means 17 switches the line relay 6 to the "B" side using the output terminal P9, and the internal register r
Set CFJ 5TEP8), outside line selection button 13
monitors the operation of the hook switch 7 and the status of the hook switch 7 (STE
P9.5 TEPIO).

When the outside line selection button 13 is operated, the process advances to 5TEPII, and when the hook switch 7 becomes off-hook, the process advances to 5TEPII.
Proceed to step 14.

At 5TEP 11, the control means 17 switches the line relay 6 to the "A" side using the output terminal P9, and resets the internal register rcFJ (to logic level "0").
EP8), the timer means 16 is activated according to the output terminal pH (STEP13), and the process proceeds to 5TEP14.

In 5TEP14, the control means 17 is the dial button 1
5, it is monitored whether a dial signal is input to the input terminal group P6. 5T when dial signal is input
Proceed to EP 15, and if no dial signal is input, proceed to 5TEP17.

5TEP15 outputs a dial signal corresponding to the input dial from output terminal P8, sends it to the line by dial sending means 8, and registers r inside control means 17.
Set the DFJ (STEP16) and proceed to 5TEP17.

Here, in the off-hook state, it is possible to talk to the other party using the interface transformer 9, the communication circuit 10, the transmitter 11, and the receiver 12.

In 5TEP17, the control means 17 is the hook switch 7
Monitor the status of and if it is on-hook (first contact and second contact?a%7b are off)
Proceed to P29, if the off footer remains, 5TEP18
Proceed to.

At 5TEP18 and 5TEP19, the control means 17 monitors the operation of the outside line selection button 13 and the extension line selection button 14. If outside line selection button 13 is operated, 5 TEP
27, and if the extension selection button 14 is operated, it will be 5TE.
Proceed to P20 and if no button is operated, 5T
Return to EP 14.

At 5TEP20 to 5TEP22, the control means 17
checks the status of internal registers "DF" and "LF" and whether the timer means 16 has expired. At least one of the internal registers 'D F J,' L F J
5TE is set or when it is detected that the expiration signal from the timer means 16 is applied to the input terminal P5.
Proceed to P25, and if none of the above is detected, proceed to 5TE.
Proceed to P23.

At 5TEP23, the control means 17 switches the line relay 6 to the "B" side using the output terminal P9, sets the internal register rcFJ (STEP24), and then switches the line relay 6 to the "B" side using the output terminal P9, and sets the internal register rcFJ (STEP24).
Return to

In the 5TEP25, the control means 17 controls the internal register r.
Check the status of cFJ and if it is set, 5TEP1
Return to 4, and if it has been reset, proceed to 5TEP26.
The switching means 5 of the holding means 5 is activated by the output terminal PLO.
Turn on the resistor 5b, connect the resistor 5b to the public line 1, and proceed to 5TEP23.

At 5TEP27, the control means 17 switches the line relay 6 to the "A" side using the output terminal P9, resets the internal register "CF" (STEP28), and then returns to 5TEP14.
Return to

In addition, in 5TEP29.5TEP30, the control means 1
It resets the registers rLFJ and rDFJ inside 7, returns to 5TEP 1, and enters a standby state.

Effects of the Invention As described above, in the present invention, when the line selection means specifies another line after the dial sending means sends a dial signal after closing the selected line, the hold means selects the selected line. control means for controlling the system so that the line is switched to another line after being put on hold, and if another line is specified by the line selection means before the dial signal is sent out by the dial sending means, the line is switched to the other line without being put on hold; , the line selection switch allows you to automatically connect to a higher priority line by simply taking the handset off-hook without having to specify a line, even if you temporarily want to talk to another person on another line during a call. There is no loss of the convenient function of automatically putting the line currently in use on hold and switching to another line with a single operation. If you have previously selected another telephone line, you can prevent the currently closed telephone line from being put on hold, thereby preventing unnecessary closing of a telephone line that you do not intend to use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the main parts of a telephone terminal device in an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of the device. 1-111 public line 2-111 extension 3-111 external line incoming call detection means 4-111 extension incoming call detection means 5-111 holding means 5a---switching means 5b--m- Resistor 6-111 line relay 7--m hook switch 7a--1 first contact 7a 7b--1 second contact 7b 8-111 dial sending means 9-111 interface Transformer 10--M-Telephone circuit 11--One transmitter 12'--One receiver 13--One external line selection button 14--One extension selection button 15--Dial button 16-- -Timer means 17---Name of control means agent Patent attorney Toshio Nakao 1 person Figure 2

Claims (1)

[Claims] Line selection that can be connected to multiple lines, selects and closes one of the multiple lines, and selects and closes a specific one of the multiple lines in response to off-hook. holding means for placing the line selected by the line selection means on hold; dial sending means for sending a dialing signal to the line selected by the line selection means; and selection and closing by the line selection means. If another line is specified by the line selection means after the dial signal is sent by the dial sending means, the holding means puts the selected line on hold and then switches to the other line, and the dial sending means and control means for controlling the selected line to be switched to the other line without putting it on hold when the line selection means specifies another line before sending out the dial signal. telephone terminal equipment.