JP2869081B2 - Communication device - Google Patents

Description

The present invention relates to a communication device connected to a telephone line together with a telephone, such as a video telephone for transmitting image information via a telephone line, and an operation mode of the communication device. Is controlled by a control signal supplied from a telephone.

(B) Conventional technology Conventionally, a communication device controlled by a control signal output from a telephone is disclosed in Japanese Patent Application Laid-Open No. 60-204162. In this method, a facsimile (communication device) is connected to a telephone line together with a telephone, and the facsimile is controlled by a control signal supplied from the telephone. Specifically, a specific number is input from the telephone after connection to the telephone line. And a facsimile to control the facsimile reception or transmission operation.

(C) Problems to be Solved by the Invention In the above conventional device, whether the control signal transmitted on the telephone line is transmitted in the upward direction of the telephone line or the control signal transmitted in the downward direction of the telephone line For example, when the called party controls the facsimile under the initiative of the calling party and transmits a control signal by mistake, the facsimile does not May cause a malfunction. In addition, a telephone line must be connected for remote control of the communication device.

(D) Means for Solving the Problems The present invention has been made in view of the above-mentioned problems, and a communication device of the present invention is provided with a first telephone which is disposed integrally or adjacently and a second telephone which is disposed at a remote place. A communication device connected via a telephone line to perform communication with the first and second telephones and controlled by a remote control signal output from the telephone during communication with the first and second telephones, A first connection terminal for connecting a first telephone line to which the first telephone is connected; a second connection terminal for connecting a second telephone line to which the second telephone is connected; and the first and second connection terminals A connection line connecting between the connection lines, a receiving unit connected to the connection line for receiving a remote control signal input from the first and second connection terminals, and the first and second connection terminals connected to the connection line At least one remote control input from Remote control signal identifying means for identifying which of the first and second telephones the received remote control signal is output from by adding a detection signal to the control signal; Control means for distinguishing remote control signals from the first and second telephones based on the control signals and permitting or rejecting control based on the signals.

According to the present invention, in the communication device according to the first aspect, when a predetermined remote control signal is input from the first or second telephone, a telephone corresponding to the predetermined remote control signal is controlled by the remote control signal. Registering means for registering as a telephone whose control is permitted or rejected, wherein said control means controls said first or second telephone based on the registered contents of said registering means.
It is characterized in that control by a remote control signal from a telephone is permitted or rejected.

According to the present invention, in the communication device according to claim 1, the remote control signal identifying means is connected to the connection line and responds to the reception of the remote control signal by the receiving means. A connection disconnecting unit that disconnects the connection between the terminals for a predetermined period; and a detecting unit that detects a change in the waveform of the remote control signal by the connection disconnecting unit. The first
And which of the two telephones is output.

According to the present invention, in the communication device according to any one of claims 1 to 3, the remote control signal is a DTMF signal.

In addition, the communication device of the present invention is connected via a communication line to perform communication between a first communication device integrally or adjacently disposed and a second communication device disposed at a remote place, and A communication device controlled by a remote control signal input from the communication device during communication with the first and second communication devices, the first communication device connecting a communication line connected to the first communication device. A connection terminal, a second connection terminal that connects a communication line to which the second communication device is connected, a connection line that connects between the first and second connection terminals, and the first and second terminals that are connected to the connection line. Receiving means for receiving a remote control signal input from a second connection terminal, and adding a detection signal to at least one remote control signal connected to the connection line and input from the first and second connection terminals. The received remote control signal is the first and Remote control signal identifying means for identifying which one of the two communication devices is output; and, based on the identification result by the identifying means, distinguishing a remote control signal from the first and second telephones to allow control by the signal or Rejecting control means.

(E) Function The device of the present invention has a function of identifying a transmission direction of a control signal transmitted on a telephone line, and controls a control means for controlling an operation mode of the communication device based on the identification result. Therefore, even if the called party performs an erroneous operation while controlling the operation mode of the communication apparatus under the initiative of the calling party, it is possible to prevent the communication apparatus from malfunctioning accordingly. Further, since the first telephone can be used as remote control means of the video telephone when the line connection with the other telephone is not made, the operation of the video telephone can be facilitated. In addition, it is possible to register the still image to be transmitted to the other party in advance in the memory of the videophone before connecting the line, and then transmit the registered image to the other party. Can be.

(F) Embodiment The present invention will be described below in detail based on an embodiment shown in the drawings. In this embodiment, the communication device is described as a videophone.

FIG. 1 is a block diagram showing a schematic configuration of a communication system using two communication devices (video telephones) of the present invention. In the figure, (1) is a first-side device, and (2) is a second-side device. All of these devices have substantially the same components, and the exchange (3) such as a private branch exchange or a central office exchange. )
And via telephone lines (4) and (5). One of the first device (2) and the second device (2) is configured to be a calling party and the other is a called party so as to be able to communicate with each other.

The first device (1) includes a first telephone (6), a first videophone (7), a first modular jack (8), and telephone lines (9) (10) for connecting these. . Similarly, the second side device (2) includes a second telephone (11), a second videophone (12), and a second modular jack (13).
And telephone lines (14) and (15) for connecting them. In the following description, each telephone (6) (11) has 12 buttons ( 10 numbers and symbols The following description is based on a push-button type in which different DTMF signals (dual-tone multi-frequency signals) are assigned to the two buttons (a) and (b), respectively. The telephone number of the first telephone (6) is "(06) 991-118.
1 "and the telephone number of the second telephone (11) is" (03) 835
−1111 ”, and the remote control number and the password (both of which will be described later) of the first videophone (7) are respectively And

FIG. 2 is a block diagram showing a schematic configuration of a front end part of a first videophone (7) of the first device (1). This configuration is substantially the same for the second videophone (12), and will be hereinafter simply referred to as the videophone (7) unless otherwise required. Incidentally, the video phone usually has a television camera, a display means such as a CRT, a memory having a capacity for storing several still images,
Although a signal exchange means for exchanging signals with the telephone is provided, none of them is shown.

A line current detector (17) that detects whether line current is flowing on the telephone line (16) for the videophone (7)
When the line current detector (17) detects the line current, the line current detector (17) shuts off or supplies power (commercial power or built-in power) (18) to the drive unit of the videophone (7). The first switch (19) to be controlled is configured to be closed. Accordingly, an operation of off-hook of the handset of the first telephone set (6) for talking or an operation substantially the same as this operation (a start-up operation from an outside line when the first telephone set has a so-called automatic call receiving function, etc.) ), The video telephone (7) of this embodiment is set to the active state,
The active state is reset by the call end operation.
Alternatively, the first switch (19) may be manually controlled by the user.

For the video telephone (7), whether the DTMF signal on the telephone line (16) is transmitted from the first telephone (6) (downward) or transmitted from the second telephone (11) (up). (20), a control means (21) controlled based on the recognition result by the identification means, and an operation mode (for example, "send") of the videophone (7) by the control means (21). , "Shooting", "viewing", etc.).

The communication request identification means (20) includes a switch (23), a capacitor (24), and a mute circuit (25) having a resistor (R);
A DTMF receiver (26) for inputting a DTMF signal of the telephone circuit (16a) and a switch control unit (27) for inputting the output of the DTMF receiver and controlling the switch (23) are provided. The movable contact (23a) of the switch (23) is normally open, but is connected to the common telephone line (L ₂ ) via the capacitor (24) when the switch controller (27) is in the active state. Fixed contact (23c).

The input terminal (26a) of the DTMF receiver (26) is connected to the telephone line (16a), so that DTMF signals from the first telephone (6) and the second telephone (11) are directly input. The DTMF receiver (26) receives these DTMF signals, outputs data corresponding to the contents of the DTMF signals (identification of which button is pressed) to a 4-bit data line (28), and performs communication. The request identification signal F is output to the line (29). The switch control unit (27) generates a switch control signal E based on the communication request identification signal, and switches the switch (23) of the mute circuit (25) to the movable contact piece (23a) of the switch control signal during the active period by using a fixed contact ( Control to connect to 23c).

FIG. 3 is a time chart for explaining the operation of the communication request identification means. In FIG. 3, A is the first telephone (6).
DTMF signal A is output when the push button is operated. Since the DTMF signal A is output while the push button is pressed, it is normally output for 60 ms or more. Period T ₁ represents a period of generation of the DTMF signal. B
Indicates a DTMF signal output when the push button of the second telephone (11) is operated, and this DTMF signal B is also output over 60 ms. Period T ₂ are illustrates the generation period of the DTMF signal.

The input terminal of the DTMF receiver (26) (26a) are DTMF signal C is inputted, DTMF signal C ₁ is the period T ₁ is also the period T ₂
DTMF signal C ₂ are input to. That is, the DTMF signal B from the second telephone (11) is temporarily lost by the mute circuit (25) as described later (this lack added to the DTMF signal distinguishes the first telephone from the second telephone). Although the detection signal becomes) inputted Therefore as DTMF signal C ₂ to the DTMF receiver (26) for, DTMF from a first telephone (6)
Signal A is input to the DTMF receiver (26) as a DTMF signal C ₁ as as described below.

The DTMF receiver (26) decodes the content of the input DTMF signal, latches the result as data, and outputs it to the data line (28). D indicates data output to this data line. DTMF receiver (26) is the input DTMF
The communication request identification signal F is output based on the presence or absence of the signal. After the DTMF signal C is input, the identification signal F is transmitted for a predetermined time τ ₁ (approximately 6
With a delay of 0 mS), the signal corresponding to the envelope of the DTMF signal C (signal F ₁ during a period T _1, the signal F ₂ is the period T ₂₎
Present.

The switch control unit (27) receives the communication request identification signal F, and after a delay time τ ₂ based on the identification signal, a predetermined time τ ₃
The switch control signal E which is in an active state (high level) for only 10 ms in the embodiment is output. During the period τ ₃ in which the switch control signal E is at the high level, the mute circuit (25)
The movable contact piece (23a) of the switch (23) is a fixed contact (23c)
DTMF signal B of the second telephone (11) is cut off by this mute circuit (25), and the DTMF receiver (26)
Since the DTMF signal C ₂ to but will be input, DTMF signal A of the first telephone (6) of the resistance (R), the potential difference across content DTMF signal of the resistor (R) is maintained, so that the DTMF signal C ₁ is input to the DTMF receiver (26).

The communication request identification means (20) may be configured as shown in FIGS. 5 and 6 separately from the configuration shown in FIGS. Hereinafter, the configuration operation of this other embodiment will be described.

The communication request identification means (20) includes a mute circuit (25) having a switch (23) and a capacitor (24), and a telephone line (16).
a) A DTMF receiver (2) that inputs a DTMF signal between (16b)
6) and the output of the DTMF receiver is input and the switch (2
3) a switch control unit (27) for controlling.
The switch (23) is connected to the telephone line (16) of the first telephone (6).
c) has a movable contact (23a), which is always connected to a fixed contact (23b) connected to the telephone line (16d) of the second telephone (11). However, when the switch control unit (27) is in the active state, the common telephone line (16
It is connected to the fixed contact (23c) connected to b) via the capacitor (24).

DTMF receiver (26) has its input terminals (26a) (26b)
Is the fixed contact (23b) of the switch (23) and the telephone line (16b)
And the DT from the first telephone (6)
The MF signal passes through the mute circuit (25), while the DTMF signal from the second telephone (11) is directly input. The DTMF receiver (26) inputs each of these DTMF signals, and outputs data corresponding to the contents of the DTMF signal (identification of which button is pressed) to a 4-bit data line (28).
And the communication request identification signal F is output to the line (29).
Output to The switch control unit (27) generates a switch control signal E based on the communication request identification signal, and switches the switch (23) of the mute circuit (25) to the movable contact piece (23a) of the switch control signal during the active period by using a fixed contact ( Control to switch to 23c).

FIG. 6 is a time chart for explaining the operation of the communication request identification means. In FIG. 3, A is the first telephone (6).
DTMF signal A is output when the push button is operated. Since the DTMF signal A is output while the push button is pressed, it is normally output for 60 ms or more. Period T ₁ represents a period of generation of the DTMF signal. B
Indicates a DTMF signal output when the push button of the second telephone (11) is operated, and this DTMF signal B is also output over 60 ms. Period T ₂ are illustrates the generation period of the DTMF signal.

The input terminals (26a) and (26b) of the DTMF receiver (26)
DTMF signal C is inputted, DTMF signal C ₁ is the period T ₁ is also a DTMF signal C ₂ to the period T ₂ are respectively inputted. That is, the DTMF signal A from the first telephone (6) is supplied to the mute circuit (2
5) described later temporarily is missing as in (this omission given to DTMF signal is the detection signal for identifying the first telephone and the second telephone) Therefore DTMF as a DTMF signal C ₁
While the input to the receiver (26), DTMF signal B from the second telephone (11) is directly input to the DTMF receiver (26) as a DTMF signal C _2.

The DTMF receiver (26) decodes the content of the input DTMF signal, latches the result as data, and outputs it to the data line (28). D indicates data output to this data line. DTMF receiver (26) is the input DTMF
The communication request identification signal F is output based on the presence or absence of the signal. After the DTMF signal C is input, the identification signal F is transmitted for a predetermined time τ ₁ (approximately 6
With a delay of 0 mS), the signal corresponding to the envelope of the DTMF signal C (signal F ₁ during a period T _1, the signal F ₂ is the period T ₂₎
Present.

The switch control unit (27) receives the communication request identification signal F, and after a delay time τ ₂ based on the identification signal, a predetermined time τ ₃
The switch control signal E which is in an active state (high level) for only 10 ms in the embodiment is output. During the period τ ₃ in which the switch control signal E is at the high level, the mute circuit (25)
The movable contact piece (23a) of the switch (23) is a fixed contact (23c)
DTMF signal A of the first telephone because it is switched to the side (6) is blocked by the muting circuit (25), so that the DTMF signal C ₁ is input to the DTMF receiver (26).

The setting of the fixed period τ ₃ is such that the lack of this period does not treat the DTMF signal before and after this loss as another DTMF signal in the exchange of the station, in other words, the DTMF signal before and after this loss is the same DTMF signal. Degree that can be handled, for example, 30
It is selected to be less than mS and to such an extent that the missing period can be identified on the identification signal F (for example, several mS or more). In addition, the setting of the delay time τ ₁ is usually set to 50 minutes because the DTMF signal is recognized as a regular DTMF signal by the exchange of the office.
Since it is detected that mS or more lasts, an appropriate time longer than this duration (50 mS) may be selected. However, the time should be sufficiently shorter than the push button pressing time (typically, at least 500 ms or more).

The communication request identification signal F from the DTMF receiver (26)
An identification signal F ₁ when its input is a DTMF signal A from the first telephone (6), also respectively control unit an identification signal F ₂ when the input is a DTMF signal B from the second telephone (11) ( 21).

The control means (21) inputs the data supplied from the data line (28) and the communication request identification signal F supplied from the DMTF receiver (26), and designates various operation modes of the videophone (7). The second switch (22) is configured to be controlled. Further, the control means performs control such as storing an image taken by a camera of the videophone in a memory, reading the image from the memory, and displaying the image on a display means. FIG. 4 is an operation flowchart of the videophone. When the handset of the first telephone (6) is off-hook, the first switch (19) is closed in response thereto, the power supply (18) is supplied to the drive unit of the video telephone (7), and the video telephone (7) stands by. Set to state (step
S ₁ ). Thereafter, the flag of the control means (21), are all reset (Step S _2). The flag is turned on when the operation mode of the video telephone (7) is controlled by the first telephone (6), and the flag is set to the second telephone (1).
It is turned on when receiving the control from 1).

Step S _3, S ₄ represents the step of performing a normal operation of the television telephone (7) to detect the presence or absence of reception from the other party phone (in this case this second telephone) (Step S _3), also self Operation switch (not shown) for the videophone (7)
The presence or absence of an input from is detected (step S ₄ ). If there is the above reception, the videophone (7) executes a reception operation (30), and also executes various operations ("see", "take", "send", etc.) corresponding to the operation switch (31). .

When TV telephone apparatus (7) inputs a DTMF signal A or B, the control means (21) detects this at step S _5, the movable contact piece of the switch (23) of the muting circuit (25) (23a) for a predetermined time Switching to the fixed contact (23c) side by τ ₃ to mute the input of the DTMF signal B to the receiver (26) (mute processing (32)). Next, the videophone identification means (2
0) identifies the identification of the DTMF signal (step S _6), when the DTMF signal is shifted to the flow I when is from the first telephone (6), whereas those from the second telephone (11) Move to Flow II. Note that the DTMF signals A and B may use remote control numbers and passwords to be described later. In the flow I, a flag is determined as step S7. Remote control number from the first telephone (6) Because There is input which was detected in step S ₈ is set (33) of the flag, after the input of the remote control number,
In step _{S 9, S 10, S 11} , based on a command by the push button from a first telephone (6), various operations (31), (3
4) and (35) can be executed. This is possible regardless of whether the lines of the first telephone (6) and the second telephone (11) are connected.

A determination of a flag in step S ₁₂ in the flow II. From the second telephone (11), the PIN Because There is input it is detected in step S ₁₃ sets (36) a flag, after entering the PIN, in step _{S 14, S 15, S 16} , from the second telephone (11) Various operations (31), (3
4) and (35) can be executed. In addition, DTMF
The signals I, II, and III are used to indicate operations such as "see,""take," and "send," brightness adjustment of the camera, and angle adjustment of the camera of the videophone (7). I have.

The flag is effective as long as the power of the videophone (7) is not turned off. Once the flag is turned on by the remote control number or the password, the television is then turned on by the first telephone (6) or the second telephone (11). The telephone (7) can be controlled.

Next, a specific control example will be described with reference to a case where control is performed on the own side (the first receiver side) and a case where control is performed from the other side (the second telephone side). Phone number of each phone,
The remote control number, personal identification number, etc. are as shown in FIG. Respectively correspond to “Send”, “Shoot”, and “View” of the videophone.

[In the case of control on own side] The telephone handset of the first telephone is off-hook to make a call to the other party. Then, the power of the videophone is turned on, and the flag is reset. Next, the telephone number of the second telephone is dialed to call the other party. Here, if the line to be used is a dial line, the DTMF signal is not output even if the number of the other party is dialed, so that the videophone simply repeats steps S ₃ , S ₄ and S ₅ in FIG. In the case using the line is touch-tone lines, DTMF signal A in step S ₅ when dialing the other party
And it is determined that the caller is on the first telephone side.
Flag returns to Step S ₈ because it does not detect a further remote control number is reset. Here, dialing in to the other only repeats steps _{S 3, S 4, S 5} , S 6, S 7, S 8, the mode selection operation of the video phone is not executed as long as the remote control number is not input. With the line connected in this way, If you enter, so sets the detected flag this at step S _8, it is possible to remote control branches from step S ₇ to step S _9. Here, the processing routine, step _{S 3, S 4, S 5} , S 6, S 7, S 9, S 10, S 11, is repeated until the routine is powered off. Then, when transmitting an image to the videophone of the second telephone using the first telephone, a push button By operating, the videophone executes the operations of “seeing”, “taking a picture”, and “sending”, and transmitting an image to the other party.

Generally, when a certain time (eg, about 20 to 30 seconds) has elapsed since the handset of the telephone was off-hook, or within a predetermined time (about 5 seconds) after the DTMF signal was generated by pressing the push button (PB). When the next PB pressing operation is not performed, a busy tone (busy tone) is transmitted from the exchange to the telephone, and the exchange does not accept the DTMF signal even if a DTMF signal is subsequently input from the telephone. In order to receive the DTMF signal, the handset must be once hooked on. By utilizing this feature, the present invention can control the operation mode of the videophone using the handset of the own telephone without connecting the line with the other party. Therefore, the image to be transmitted to the other party can be stored in the memory of the videophone in advance, and then the stored image can be transmitted to the other party to improve the efficiency of the transmission process. It is.

[When controlling the other party] First, a call is made from the second telephone to the first telephone. When the first telephone has an automatic call receiving function and answers an incoming call, power is supplied to the first videophone, and the first videophone is set in an operable state. Here, videophone flag in step S ₂ of FIG. 4, and resets and repeats the processing routine step S _3, S _4, S ₅ and to the detection of the DTMF signal.

If you enter a personal identification number from the second telephone in this state, detecting a DTMF signal in step S _5, it is determined that the DTMF signal from the second telephone in the step S _6, the process branches to flow II.
Until PIN is decrypted in step S _13, the flag of the treatment of step S ₁₃ because it is in a reset state is executed. When the flag is set, step S _14, S _15,
The process proceeds to S _16, and receives a remote operation from the second telephone. For example, a push button By pressing, an image captured by the first videophone can be displayed on the second videophone. In addition, step
Since in S ₁₃ when the PIN is not detected, is not capable of the remote operation branches to, it is possible to prevent mischief or the like. Then, once the flag is set, the processing routine of the remote operation is executed until the line is disconnected.

In the above description of the present invention, the videophone has been described as an embodiment, but the present invention can be similarly implemented as long as it is a communication device that performs communication using a telephone line. Further, although the touch phone is used as the telephone, the present invention can be implemented by using another dial type telephone. in this case,
Since the dial signal is output as the number of DC disconnections,
This may be used to form a DTMF signal or a control signal corresponding to the DTMF signal, and signal exchange may be performed using the control signal.

(G) Effect of the Invention As described above, the communication device of the present invention can transmit a received remote control signal from the first telephone based on the result of identifying which of the connected telephones the signal is output from. Since the output remote control signal and the remote control signal output from the second telephone are distinguished from each other and the control by the remote control signal is permitted or rejected, for example, a state in which the telephone line is connected between the first and second telephones. In the case where the communication device is to be controlled from the first telephone, it is possible to determine that the signal is not the signal output from the first telephone even if the remote control signal is output from the second telephone. Incorrect control can be prevented, and conversely, control by the second telephone can be performed without interference from the first telephone. Is necessary to add a new control signal line between the first telephone and the second telephone and the communication device, and to transmit a signal output from the first telephone and the second telephone with a signal indicating the origin. As a result, there is an excellent effect that the existing system itself (telephone, exchange, and telephone line) can be easily introduced without any change.

In the embodiment of the present invention, it is possible to remotely control a specific operation mode of the videophone by inputting a specific DTMF signal from the telephone. Therefore, there is no possibility that the pose at the time of this operation is photographed when photographing with the camera of the videophone.

[Brief description of the drawings]

All of the drawings relate to the device of the present invention, and FIG. 1 is a block diagram showing a schematic configuration of a communication system using two communication devices of the present invention. FIG. 2 is a block diagram showing a schematic configuration of a front end unit of the videophone, and FIG. 3 is a time chart for explaining the operation of the communication request identification means. FIG. 4 is an operation flowchart of the videophone. FIG. 5 is a block diagram showing a schematic configuration of another embodiment of the front end portion of the videophone. FIG. 6 is a time chart for explaining the operation of the communication request identification means of another embodiment. (19)... First switch, (22)... Second switch,
(20) ... communication request identification means, (6) ... first telephone,
(11) ... second telephone, (21) ... control means.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 11/00-11/10

Claims (5)

(57) [Claims] 1. A first telephone set connected via a telephone line for communication between a first telephone set integrally or adjacently and a second telephone set at a remote place, and said first and second telephone sets are connected to each other.
A communication device controlled by a remote control signal output from a telephone during communication with the telephone, wherein the first device connects a first telephone line to which the first telephone is connected.
A second terminal for connecting a connection terminal and a second telephone line to which the second telephone is connected;
A connection terminal, a connection line connecting between the first and second connection terminals, a receiving unit connected to the connection line and receiving a remote control signal input from the first and second connection terminals, and the connection By adding a detection signal to at least one remote control signal connected to a line and input from the first and second connection terminals, the received remote control signal is output from either the first or second telephone. Remote control signal identifying means for identifying whether or not the first and second signals have been detected.
Control means for distinguishing a remote control signal from the telephone and allowing or rejecting control by the signal. 2. When a predetermined remote control signal is input from the first or second telephone, a telephone corresponding to the predetermined remote control signal is registered as a telephone whose control by the remote control signal is permitted or rejected. Registering means, wherein the control means controls the first control based on the registered contents of the registering means.
2. The communication device according to claim 1, wherein control by a remote control signal from the second telephone is permitted or rejected. 3. The connection disconnection means for disconnecting a connection between said first and second connection terminals for a predetermined period in response to reception of a remote control signal by said receiving means, said remote control signal identification means being connected to said connection line. Means for detecting a change in the waveform of the remote control signal by the connection interrupting means, wherein the remote control signal is output from one of the first and second telephones based on the detection result of the detecting means. The communication device according to claim 1, wherein the communication device identifies whether the communication has been performed. 4. The communication device according to claim 1, wherein said remote control signal is a DTMF signal. 5. A communication system for communicating between a first communication device integrally or adjacently disposed and a second communication device disposed at a remote location via a communication line, and the first and second communication devices are connected to each other. 2
A communication device controlled by a remote control signal input from the communication device during communication with the communication device, wherein: a first connection terminal for connecting a communication line connected to the first communication device; A second connection terminal that connects a communication line to which a second communication device is connected; a connection line that connects the first and second connection terminals; and a first connection terminal that is connected to the connection line. Receiving means for receiving the input remote control signal; and adding the detection signal to at least one of the remote control signals connected to the connection line and input from the first and second connection terminals. Remote control signal identification means for identifying which of the first and second communication devices the control signal is output from; and the first and second communication means based on an identification result by the identification means.
Control means for distinguishing a remote control signal from the telephone and allowing or rejecting control by the signal.