JP3356057B2 - Communication terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal having a dial-in number detection function.

[0002]

2. Description of the Related Art In recent years, dial-in services have become widespread. This dial-in service is a service that can receive a dial-in number from a subscriber line exchange. By using this service,
For example, even when a plurality of communication devices are connected to one line, these communication devices can be switched according to the dial-in number from the local exchange. In this case, the caller uses a different telephone number for each communication device to make a call.

For example, when a communication device is connected to an image communication device such as a facsimile as a communication device, and when the calling side wants to receive a call at the communication device to make a call, a call is made using a telephone number corresponding to the communication device. I do. Since the dial-in number of the communication device is notified from the subscriber line exchange, the communication with the calling side can be performed by switching the line to the communication device on the receiving side. Similarly, when the caller attempts to transmit an image, the call is transmitted using a telephone number corresponding to the image communication device. Since the subscriber line exchange notifies the receiving side of the dial-in number of the image communication apparatus, the receiving side can receive the transmitted image by switching the line to the image communication apparatus.

[0004] By using the dial-in service in this way, more communication devices than the number of lines can be connected. In addition, by using the telephone number corresponding to the communication device that the caller wants to receive, it is possible to reliably connect to the intended communication device.

However, if the calling party makes a mistake in the telephone number,
Even if the communication equipment is connected to the same line,
You cannot connect to the intended communication device. For example, 1
A case is considered in which a telephone device and an image communication device are connected to this line, and these devices are switched by a dial-in number. If an attempt is made to transmit an image on the calling side and a call is erroneously made using a telephone number corresponding to the calling device, the receiving side will receive the call. For this reason, even with communication using the same line, the image communication device cannot receive an image. In this case, the transmitting side has a transmission error. The transmitting side had to transmit again using a telephone number corresponding to the image communication apparatus, which was very inconvenient.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been developed in a communication terminal device having a dial-in number detection function, even when a call is selected based on the dial-in number. It is another object of the present invention to provide a communication terminal device capable of performing image communication if the transmitting side is an image communication device.

[0007]

According to a first aspect of the present invention, there is provided a communication means having a function for enabling a telephone call with a handset, an image communication means for transmitting and receiving image information, and a function corresponding to a dial-in number. A communication terminal device having a line control means including a function of switching which of the image communication means and the communication means is connected to the line, wherein the line control means changes the dial-in number when calling from the local exchange. When the received dial-in number is a telephone number, after connecting a line to the communication means, monitoring the line and switching the line to the image communication means when the calling side is an image communication device. Is what you do.

According to a second aspect of the present invention, in the communication terminal device according to the first aspect, the line control means monitors a line and determines whether or not a CNG signal transmitted from the calling side has been detected. It is characterized in that it is determined whether or not the transmitting side is an image communication device.

According to a third aspect of the present invention, in the communication terminal device according to the first aspect, an image communication procedure signal is transmitted when the communication means detects that the handset is off-hook and then on-hook. It is characterized by the following.

[0010]

FIG. 1 is a block diagram showing an embodiment of a communication terminal device according to the present invention. In the figure, 1 is a line control unit, 2 is an image communication unit, 3 is a communication unit, 4 is a handset, 11 is a main control unit, 12 is a display unit, 13 is an operation unit, 1
4 is a reading unit, 15 is a recording unit, 16 is an image memory, 17 is a RAM, 18 is a ROM, 19 is a modem, and 20 is a bus. Note that the example shown in FIG. 1 shows an example in which the call function and the image communication function are switched and used depending on the dial-in number.

The line control unit 1 controls the line connection with the subscriber line exchange and, based on the dial-in number sent from the subscriber line exchange, connects either the image communication unit 2 or the communication unit 3 to the line. Switch whether to connect. In addition, as described later, control is performed to monitor the line when a call arrives at the communication unit 3 and to switch the line to the image communication unit 2 when the other party is an image communication device. Further, when the handset 4 is hooked off-hook after being off-hook in the communication unit 3, control is performed to enable image communication by transmitting an image communication procedure signal.

The image communication section 2 transmits and receives image information. In this example, the image communication unit 2 also functions as a part of the line control unit 1 and the communication unit 3. The image communication unit 2 includes a main control unit 11, a display unit 12, an operation unit 13, a reading unit 14, a recording unit 15, an image memory 16, a RAM 17, a ROM 18,
It has a modem 19 and the like. These units, the line control unit 1 and the communication unit 3 are interconnected by a bus 20.

The main control unit 11 performs various processes for transmitting and receiving images together with controlling the entire image communication unit 2. The display unit 12 can display various information such as a message to the user, a message indicating the state of the apparatus, transmission / reception data, and operation guidance. Operation unit 13
Is used when the user sets a transmission function, a reception function, and the like. The reading unit 14 reads image information to be transmitted or recorded. The recording unit 15 includes a receiving or reading unit 14.
The image information read by is recorded on the recording medium. The image memory 16 stores image data to be transmitted or received, image data read by the reading unit 14, image data to be recorded by the recording unit 15, image data being processed, and the like. The RAM 17 is used when it is necessary to store data in the processing of the main control unit 11 and other units.
The ROM 18 stores a program that defines the operation of the main control unit 11, fixed data, and the like.

The communication unit 3 has a function for enabling a telephone call with the handset 4. It also detects on-hook and off-hook.

FIG. 2 is a flowchart showing an example of the operation of the communication terminal apparatus according to the embodiment of the present invention.
FIG. 4 is a sequence diagram showing a basic operation in the dial-in service. An example of the operation of the communication terminal device of the present invention will be described with reference to the sequence diagram in the dial-in service shown in FIG.

When a call is made to the communication terminal apparatus of the present invention, the subscriber line exchange inverts the polarity of the line in FIG. 3 (A) and sends out a call signal in FIG. 3 (B). The communication terminal device determines whether or not a calling signal has been received in S31 of FIG. After receiving the call signal, the communication terminal device sends a primary response signal to the local exchange as shown in FIG. 3 (C).

When the subscriber line exchange detects the primary response signal, it transmits an extension designation signal to the communication terminal as shown in FIG. 3 (D). The extension designation signal is, for example, a push tone signal and indicates a dial-in number. The communication terminal device receives the dial-in number in S32. Thereafter, the communication terminal device sends an extension designation reception completion signal to the subscriber line exchange as shown in FIG. Upon receiving the extension designation reception completion signal, the subscriber line exchange sends a ringing tone to the calling side.

The communication terminal device performs a process of selecting a communication device corresponding to the received dial-in number and connecting to a line. In S33, it is determined whether or not the received dial-in number is for telephone use. If it is for image communication, the line is connected to the image communication unit 2. When the line is connected, a secondary response signal shown in FIG. 3 (F) is sent to the local exchange. Thereafter, the polarity is reversed as shown in FIG. 3 (G), and communication can be performed as shown in FIG. 3 (H). In S41, the image communication unit 2 can receive the transmitted image.

If the dial-in number received in S32 is a telephone number, the line is connected to the communication unit 3. Conventionally, a ringing tone of a telephone is made to ring and the user waits for the handset 4 to go off-hook. In the present invention, it is determined whether or not the caller is an image communication device before off-hook so that an image can be received even if image communication is performed by mistake on a telephone dial-in number. First, FIG.
The secondary response signal shown in (F) is sent to the local exchange. Upon receiving the secondary response signal, the subscriber line exchange reverses the polarity as shown in FIG. 3 (G) and starts communication as shown in FIG. 3 (H). The communication terminal monitors the line,
In S34, a CNG signal to be transmitted when the transmitting side is an image communication device is detected. When the CNG signal is detected, the image communication is erroneously attempted using the telephone dial-in number. for that reason,
The line is switched to the image communication unit 2, and the image transmitted by the image communication unit 2 is received in S41. In this way, even if an image is transmitted by mistake using the telephone dial-in number, it can be received by the image communication unit 2. Also, the image can be transmitted on the transmitting side without causing a communication error.

If the CNG signal cannot be detected, or in parallel with the operation of detecting the CNG signal, in step S35, a ringing tone is sounded to notify the incoming call, and the calling side is being called. Is transmitted. Then, in S36, the handset 4
Waits to go off-hook. If the handset 4 is not hooked off due to absence or the like, the incoming call ends as it is.

When the handset 4 goes off-hook, S
At 37, a telephone call can be made. This call is continued until the on-hook of the handset 4 is detected in S38. During this call, the line may be monitored to detect a CNG signal. When the CNG signal is detected, the line can be switched to the image communication unit 2 even before the handset 4 is on-hook to receive an image. In this case, a message to switch the line to the image communication unit 2 may be sent via the communication unit 3.

For example, if the transmitting side is an image communication apparatus but cannot detect a CNG signal in S34 or originally does not transmit a CNG signal, then even if the handset 4 is off-hook, there is no sound or occasional signal sound. State. The same applies to a case where the other party attempts to transmit manually. In such a case, if the operator is familiar with such a state, the line can be manually switched to the image communication unit 2 to receive an image. However, in the case of an unskilled operator, the handset 4 may go on-hook as it is without knowing the reason. Even for a skilled operator, manual line switching requires time and effort.

In order to cope with such a case, the present invention executes an image receiving procedure after the handset 4 is hooked on. In step S39, a DIS signal is sent to the other party, and in step S40, a DCS signal is detected. If a DCS signal is sent from the other party in response to the DIS signal, the line may be switched to the image communication unit 2 assuming that the other party is an image communication device, and the image sent in S41 may be received. . In this way, once the handset 4
Even after is off-hook, an image can be received after on-hook. If the DCS signal is not sent from the other party, the call is terminated.

Switching of the line to the image communication unit 2 based on the detection of the CNG signal in S34 or S3
9, the switching to the image communication unit 2 after the on-hook in S40 may be performed.

Although the example shown in FIG. 1 shows one example of the communication unit, the present invention can be applied to a configuration in which a plurality of communication units exist and switching is performed by dial-in numbers. That is, when the dial-in number corresponding to any one of the communication units is notified, if the other side of the line is an image communication device, the line may be switched to the image communication unit 2. Further, in addition to the telephone and the image communication device, various communication devices may be connected to be switchable based on the dial-in number.

FIG. 1 shows the line control unit 1 as an independent element. When the line control unit 1 functions independently, the line control unit 1 can function to select an extension based on a dial-in number, similarly to the private branch exchange. In this case, by setting what equipment is connected to each extension in the line control unit 1, when the line is connected to the extension to which the telephone is connected as described above, When the device is a device, control can be performed so that the line is switched to a preset extension of the image communication device. Further, for example, the line control unit 1 can be incorporated as a part of the image communication device, and the line control unit 1 can switch between the telephone connected to the image communication device and the image communication function. In this case,
Part of the functions of the line control unit 1 can be realized by the image communication unit 2, particularly, the main control unit 11.

[0027]

As is apparent from the above description, according to the present invention, even if the transmitting side mistakenly transmits an image to a telephone telephone number, the line is automatically switched to the image communication means. Without receiving the image. Therefore, the calling side does not need to call back the telephone number for image communication. On the receiving side,
Even if the dial-in number for telephone is notified, when an image is sent, the image can be received.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a communication terminal device of the present invention.

FIG. 2 is a flowchart illustrating an example of an operation of the communication terminal device according to the embodiment of the present invention.

FIG. 3 is a sequence diagram showing a basic operation in a dial-in service.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Line control part, 2 ... Image communication part, 3 ... Call part, 4 ... Handset, 11 ... Main control part, 12 ... Display part, 13 ... Operation part, 14 ... Reading part, 15 ... Recording part, 16 ... Image Memory, 17 RAM, 18 ROM, 19 modem, 20
…bus.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04M 11/00-11/10 H04N 1/00 H04N 1/32-1/36 H04N 1/42-1 / 44

Claims (3)

(57) [Claims] 1. A communication unit having a function of enabling a telephone call with a handset, an image communication unit for transmitting and receiving image information, and a line connecting either the image communication unit or the communication unit according to a dial-in number. In a communication terminal device having a line control means including a function of switching connection to a telephone line, the line control means receives the dial-in number at the time of calling from the subscriber line exchange, and the dial-in number is a telephone number. A communication terminal device, wherein, after connecting a line to the communication means, monitoring the line and switching the line to the image communication means when the calling side is an image communication device. 2. The system according to claim 1, wherein the line control means monitors the line and determines whether or not the calling side is an image communication device based on whether or not a CNG signal sent from the calling side is detected. Item 2. The communication terminal device according to item 1. 3. The communication terminal according to claim 1, wherein the line control means sends an image communication procedure signal when the communication means detects that the handset is off-hook and then on-hook. apparatus.