JPH01321749A - Transfer phone device - Google Patents

Abstract

PURPOSE:To perform the transfer operation even in case of no change of the electric characteristic of a telephone line on the called subscriber side at the time of response of the called subscriber by transmitting a line unconnection warning signal to the telephone line after transmitting the telephone number of the called subscriber by a dialing control circuit. CONSTITUTION:When a calling subscriber calls a transfer telephone equipment B by a telephone set A, a dialing control circuit 4 is operated to transmit the telephone number of a preliminarily set telephone set C through telephone lines L1' and L2' for transmission in the case of the transfer mode. A warning signal transmission control circuit 7 continuously transmits the line unconnection warning signal of a preliminarily set tone or voice. When the voltage polarity is not inverted on transmission telephone lines L1' and L2' at the time of response of the called subscriber, the line unconnection warning tone is heard from a handset on the called subscriber side. By this warning tone, the called subscriber detects that the reception call is transferred from the transfer telephone equipment B and its own line is not connected to the line of the calling subscriber yet.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a telephone transfer device that transfers incoming calls when the person is absent to a preset called party.

Conventional technology〉 Conventionally, such a forwarding telephone device is shown in Fig. 4.
There is something like that. This transfer telephone device has an incoming telephone line, I7. An incoming call detection circuit 1 connected to the circuit detects a call from a caller and outputs a detection signal to the line connection control circuit 2. Upon receiving the detection signal, the line connection control circuit 2 rings the telephone 3 if the device is not in the transfer mode, operates the dialing control circuit 4 if the device is in the transfer mode, and selects a preset called party. The telephone number of the person is sent via the call matrix circuit 5 to the telephone line L1°.

and send it to ゛. When the called party responds, the called party response detection circuit 6 detects the response and outputs a detection signal to the line connection control circuit 2, and the line connection control circuit 2 responds to the call matrix. By controlling the circuit 5, the incoming telephone line L1゜Lt & the outgoing telephone line +',
Connect Lt°.

<Problems to be Solved by the Invention> By the way, the called party detection circuit 6 detects that the called party has answered by using the calling telephone line L1. L! The determination is made by detecting that the voltage polarity between ' is reversed from the case of calling.

However, reversal of voltage polarity as described above does not necessarily occur in all telephone lines.

For example, if the call is received outside the city or if this forwarding telephone device is located under a private branch exchange, the outgoing telephone line L1.
L! ' No reversal of voltage polarity occurs.

In such a case, regardless of whether the called party answers or not, the two lines cannot be connected because no response is detected, and the called party's telephone device becomes idle. The called party cannot recognize the type of call received.

In this way, the two-legged traditional transfer phone device will be connected,
Depending on the U call line, normal transfer operations may not be possible, and this has the drawback of limiting the environments in which it can be installed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a telephone transfer device that can perform a transfer operation even when the called party's telephone line is a telephone line that does not cause reversal of the voltage polarity to which the called party responds. It's about doing.

In order to achieve the two objectives, the present invention includes an incoming call detection circuit that detects a calling signal from a caller and outputs a detection signal, and an incoming call detection circuit that detects a call signal from a caller and outputs a detection signal. After receiving the detection signal,
A dialing control circuit transmits a preset telephone number of the called party to a telephone line other than the telephone line to which the calling signal was sent; A forwarding telephone device is equipped with a called party response detection circuit that detects based on a characteristic of the called party, and connects a calling party's telephone line and a called party's telephone line when the called party answers, an alarm signal sending control circuit that sends a line disconnection warning signal to the telephone line after the dialing control circuit sends the telephone number of the called party; A DTMF signal detection circuit for line connection that detects a predetermined DTMF signal sent to the line, and a DTMF signal detection circuit for line connection when the called party response detection circuit detects that the called party has answered. detects the predetermined DTMF signal, causes the warning signal sending control circuit to stop sending the line disconnection warning signal, and connects the calling party's telephone line and the called party's telephone line. The system is characterized by being equipped with a line connection control circuit.

Function> The incoming call detection circuit detects a calling signal from the caller and outputs a detection signal, and the dialing control circuit receives the detection signal output by the incoming call detection circuit and performs a preset call detection circuit. Send the caller's telephone number to a telephone line other than the telephone line to which the above call signal was sent. After the dialing control circuit sends the telephone number of the called party, the alarm signal sending control circuit sends a line disconnection warning signal to the telephone line, and the called party answers. If the called party response detection circuit detects that the called party has answered based on the electrical characteristics of the telephone line, or if the called party hears the warning signal and sends a predetermined signal to the telephone line. ) 7I" DTMr for line connection of MF signal;'
When the signal detection circuit detects the signal, the line connection control circuit stops sending the line disconnection warning signal to the warning signal sending control circuit, and connects the calling party's telephone line and the called party's telephone line. Connect.

Therefore, even if the electrical characteristics of the telephone line on the called party's side do not change when the called party answers, the transfer operation can be performed, and the environment in which this device can be installed is not limited.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a block diagram showing the circuit configuration of the transfer telephone device of this embodiment. This transfer telephone device is equipped with an incoming call detection circuit l5fIt handset 3, a dialing control circuit 4, a call matrix circuit 5, and a called party response detection circuit 6 in the conventional example shown in FIG. A control circuit 7 and a DTMF signal detection circuit 8 are provided, and these are controlled by a line connection control circuit 9 instead of the line connection control circuit 2 in the conventional example.

FIG. 2 shows an example of a line connection system diagram when the above transfer telephone device is used.

In FIG. 2, A is a calling side telephone, B is a transfer telephone device of this embodiment, and C is a transfer destination telephone, Kl.

K2 and 3 are telephone offices, X is a private branch exchange, and Ll.

Ll1. LIT [and LIV are general telephone lines, La,
Lb is a line between stations.

Now, when a caller makes a call using telephone A using lines Ll and L■, transfer telephone device B switches to the transfer mode.

- If it is a call, the forwarding destination telephone vXC is automatically called using the empty line Lm, and when the called party answers, telephones A and C automatically or in accordance with the called party's line connection request, call the forwarding telephone device vXC. A connection is established via B, and the calling tone and the called tone become available for communication.

FIG. 3 is a flowchart showing the transfer operation of the transfer telephone device of this embodiment.

In step S1, when a caller makes a call to the transfer telephone device B of this embodiment using a telephone, a DC voltage is applied between terminals 1 and 1 of FIG.
A signal on which the 611z bell ringing tone is superimposed is generated. Then, the incoming call detection circuit 1 detects this signal, determines that there is an incoming call, and outputs a detection signal to the line connection control circuit 9 in step S2. When the line connection control circuit 9 receives the detection signal, if the device is not in the transfer mode, step S
Proceeding to step 11, other mode processing such as not ringing the telephone 3 is performed.

On the other hand, in the case of the transfer mode, the process proceeds to step S3, in which the dialing control circuit 4 is activated and the preset telephone number of the telephone C is transferred to the idle outgoing telephone line via the call matrix circuit 5. .

Transmit using L and °. Next, the process proceeds to step S4, where the warning signal sending control circuit 7 continuously sends out a preset sound or audio line disconnection warning sound. Then, in step S5, it is determined whether or not the caller's line has been disconnected, and if the line has been disconnected, step S1
Proceed to step 2 to perform line disconnection processing such as stopping the transmission of the line disconnection warning sound. On the other hand, if the calling party's line is not disconnected in step S5, the process proceeds to step S6, and it is determined whether the called party has responded.

Here, the called party response detection circuit 6 detects the outgoing telephone line L +
”, L t' is reversed between when telephone C is ringing and when the called party picks up the handset of telephone C to answer. The system detects the response of the called tone.

Therefore, if the originating telephone lines L+', Lt' are telephone lines in which the voltage polarity is reversed when the called party responds, the called tone response detection circuit 6 detects the response when the called party answers. Then, the process proceeds from step 56h) to step S8, where the warning signal sending control circuit 7 stops sending out the warning sound, and then the process proceeds to step S9, where the incoming telephone line is connected.2. ■7. and the outgoing telephone line L1°.

Connect ゛4°.

On the other hand, the outgoing telephone line L1. If L t' is a telephone line in which voltage polarity inversion does not occur when responding to the called tone, even if the called tone responds in step S6, the called tone response detection circuit 6 does not detect the response. Then, on the called side, a two-leg line disconnection warning tone is heard from the handset.

This warning tone is a constant dial tone or a voice that repeats instructions for the called party, such as "Press the "#" key to connect the line." The incoming call is forwarding phone device B.
You can know that the call has been forwarded to you and that your own line has not yet been connected to the caller's line.

Then, in step S7, when the called party presses the "#" key of the telephone nC to request line connection, a DTMF signal corresponding to that key is sent from the telephone C to the transfer telephone device B. Then, this DTMF signal is transferred to telephone device B.
The DTMF signal detection circuit 8 detects the call, determines that there is a line connection request from the called party, and sends a control signal for line connection to the line connection control circuit 9. In response to this control signal, the line connection control circuit 9 causes the warning signal sending control circuit to stop sending out the warning sound in step S8, and then in step S8
Go to 9 for the incoming phone line, L, and the outgoing phone line, '
, Lx' are connected. Therefore, the incoming telephone line L1, °
Transfer operation can be performed reliably even when voltage polarity reversal does not occur.

Note that when the conversation between the calling party and the called party ends after the transfer operation is completed, both lines are disconnected by detecting a busy tone due to disconnection of either line.

<Effects of the Invention> As is clear from the above, the forwarding telephone device of the present invention has the following advantages:
The dialing control circuit receives the detection signal output by the incoming call detection circuit when it detects a calling signal from the calling party, and then detects the preset telephone number of the called party when the above calling signal is sent. After sending a signal to a telephone line other than the telephone line, the alarm signal sending control circuit sends a line disconnection warning signal to that telephone line, and the electrical characteristics of the telephone line detect that the called party has answered. If the callee response detection circuit detects that the called party has answered, or if the called party
A predetermined D' sent to the telephone line upon hearing the two-leg warning signal.
When the line connection DTMr; signal is detected by the line connection DTMr; signal, the line connection control circuit stops sending the warning signal 5 (the line disconnection warning signal to the transmission control circuit). Since the telephone line of the calling party and the telephone line of each called party are connected, the telephone line of the called party is a telephone line whose electrical characteristics do not change when the called party answers. However, the transfer operation can be performed even if the device is installed, and the environment in which it is installed is not limited.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention, Fig. 2 is a diagram showing an example of a line connection system diagram when the above embodiment is used, and Fig. 3 is a transfer diagram in the above embodiment. A flowchart showing the operation, and FIG. 4 is a block diagram showing the circuit configuration of a conventional example. l... Incoming call detection circuit, 2.9... Line connection control circuit, 3... Telephone, 4... Dialing control circuit, 5
... Call matrix circuit, 6... Called party response detection circuit, 7... Warning signal sending control circuit, 8... D'r MF' (No. 6 detection circuit. Patent applicant: Sharp Agent Co., Ltd.
Patent attorney Maeda Ao and 1 other person Figure 2 1-!

Claims (1)

[Claims] (1) An incoming call detection circuit that detects a calling signal from a calling party and outputs a detection signal; and upon receiving the detection signal output from the above incoming call detection circuit, the callee's telephone number set in advance is sent to the above. A dialing control circuit that sends out a call signal to a telephone line other than the telephone line to which the calling signal has been sent, and a called party response detection circuit that detects that the called party has answered based on the electrical characteristics of the telephone line. , in a forwarding telephone device that connects the calling party's telephone line and the called party's telephone line when the called party answers, the dialing control circuit transmits the telephone number of the called party. and a line connection DTMF that detects a predetermined DTMF signal that the called party sends to the telephone line upon hearing the warning signal. a signal detection circuit; and when the called party response detection circuit detects that the called party has answered, or when the line connection DTMF signal detection circuit detects the predetermined DTMF signal, the warning signal is sent. Transfer characterized by comprising a line connection control circuit that causes the transmission control circuit to stop sending the line disconnection warning signal and connects the telephone line of the calling party and the telephone line of the called party. Telephone device.