JPS6142990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call display device in a transfer telephone device used in combination with a push-button telephone.

The transfer telephone device transfers the call to any preset telephone device by using the telephone device that made the call to further call another telephone device. FIG. 1 is a block diagram of a typical forwarding telephone device. In FIG. 1, reference numbers L ₁ and L ₂ indicate terminals of the incoming circuit. When a calling signal arrives at the incoming call circuits L ₁ and L ₂ , the signal receiving circuit 1 sends a signal to the office line activation control circuit 2 . Next, when the station line activation control circuit 2 sends an activation control signal to the station line activation circuit 3, the station line activation circuit 3 is controlled by the MF signal control circuit 4.
The output of the MF signal generating circuit 5 is sent to lines L ₁ ′ and L ₂ ′. The preprogrammed FM signal is then supplied to lines L ₁ ′ and L ₂ ′, and the destination telephone is called. When the transfer destination telephone responds to this call, the polarity of lines L ₁ ′ and L ₂ ′ is reversed, and the called party response detection circuit 6 detects this change in polarity and closes the communication path 7. to be accomplished. The automatic transfer is now completed without requiring any human operations.

The automatic transfer telephone device described above can be used with a push-button telephone device having a simple switching function.
As shown in FIG. 2, this push-button telephone device comprises a handset 8, a dial 9, a push button 10, a pilot lamp 11, and the like. Note that the pilot lamp 11 is for displaying the operating line. To make a call using the telephone device shown in FIG. 2, pick up the handset 8, check the pilot lamp 11 for an empty line, press the push button 10 corresponding to the empty line, and operate the dial 9. do.

Pilot lamp 11 of this type of push button telephone device
The operation is linked to the operation of the switch. For example, pilot lamp 11 is turned off.
Even if the push button 10-3 corresponding to ``-3'' is pressed, the pilot lamp 11-3 does not light up until the user picks up the handset 8 and turns on the switch. This effect is particularly effective in the following cases. In other words, after pressing the push button 10 to make a call, the user forgets to reset the push button 10 and the handset 8 is turned off.
may be returned. At this time, if the pilot lamp 11 continues to light up, it will indicate that the call is in progress, which is very inconvenient. Therefore, when the handset 8 is returned, it is necessary to turn off the pilot lamp 11.

When a push-button telephone device having the above-mentioned functions is used together with the automatic transfer device shown in FIG. 1, a push-button telephone device capable of automatic transfer is obtained. Therefore, when a call is received to a push-button telephone device with a built-in automatic transfer device, push button 10 is automatically sent to any other telephone.
can be transferred without any operations.

However, during the transfer, neither the push button 10 nor the handset 8 is operated, so the pilot lamp 11 does not light up. Therefore, since it is not possible to determine whether the line is free or not, the push button 10 that corresponds to the line that is being transferred or for which a call path has been formed due to the transfer is likely to be pressed by mistake. Depending on the model of the push-button telephone, there is a type that returns when there is an interruption, so it is necessary to provide a display indicating that the transfer is in progress to prevent interruptions from occurring. The present invention eliminates these drawbacks in the prior art, and its purpose is to enable display of the transfer in progress without operating the handset 8 or the push button 10, thereby eliminating the connection or unnecessary The purpose is to prevent unnecessary interruptions.

An embodiment of the present invention will be described below with reference to FIG. FIG. 3 is a block diagram of an automatic transfer telephone system similar to that of FIG. In FIG. 3, the called party response detection circuit 6 not only forms a communication path 7 by detecting power, but also forms an electrical signal or contact output at a terminal 12. The output appearing at this terminal 12 is used, for example, to light the pilot lamp shown in FIG. 2, 11-3. That is, since the pilot lamp 11 is turned on at the same time as the communication path is established by automatic transfer, the occurrence of erroneous interruptions is prevented.

As described above, in the present invention, the pilot lamp 11 of the push-button telephone is lit at the same time as the call path is established by automatic transfer, thereby preventing unnecessary interruptions or undesired line recovery.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a transfer telephone device, FIG. 2 is a front view of a push-button telephone device, and FIG. 3 is a block diagram of a transfer telephone device according to the present invention, which is provided with means for displaying calls. In the figure, 1 is a signal receiving circuit, 3 is a station line starting circuit,
6 is a called party response detection circuit, 8 is a handset, 1
0 is a push button and 11 is a pilot lamp.

Claims (1)

[Claims] 1 A device for displaying calls by automatic call transfer on a push-button telephone, which includes a signal receiving circuit that receives a call signal, and a station that activates a central office line for transfer based on the output of this signal receiving circuit. line starting circuit;
Generates an MF signal corresponding to the forwarding destination phone number
A push-button telephone having an MF signal generation circuit, a called party response detection circuit for detecting a response of a telephone at a transfer destination, a pilot lamp having a plurality of push buttons and a number, and a handset; A call display device for a transfer call, characterized in that the call indicator is controlled by the operation of the handset and the output of the called party response detection circuit.