JP2003163756A - Communication terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal device in which transfer service during a call can be utilized even when an analog telephone line is changed to an ISDN line. <P>SOLUTION: A call transmitted from a communication terminal device 1 of a call originating source by the ISDN line received by a communication terminal device 3 via an exchange 2 and a terminal adapter 6, and the communication terminal device 3 becomes a transfer source and transfers the incoming call to the communication terminal devices of transfer destinations 4 and 5 by transfer during a call. After the lapse of a prescribed time from the transmission of a transfer start signal to the terminal adapter 6, the communication terminal device 3 sends the dial number of the transfer destination without detecting a second dial tone. Besides, after the dial number of the transfer destination is sent, without detecting the inversion of a polarity, the possibility of transfer during the call is judged on the basis of a signal from the transfer destination. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device configured so that a call transfer service can be used when an analog telephone line is changed to an ISDN line.

[0002]

2. Description of the Related Art In a communication terminal device such as a facsimile device configured as a multi-function peripheral having a copy function, a communication terminal device having a call function or an image transmitted from a sender is received and the received image is displayed. There is known one having a function of transferring to a preset transfer destination (FAX transfer function). Further, a communication terminal device having a call function can be configured to transfer a call received from a caller to a transfer destination by using a call transfer function serviced by a line carrier.

As described above, the communication terminal device having the FAX transfer function and the call transfer function can transfer the image transmitted from the caller as the transfer source and the call received from the caller. Therefore, it is possible to deal with various services and the utility value of the communication terminal device is enhanced.

By the way, the recent ISDN (Integra)
arated Service Digital Network
With the popularization of the ork) line, various services corresponding to the ISDN line are provided by the line company. Call transfer is provided as an example of such a service.

In-call transfer is to temporarily hold a call from a caller placed on a communication terminal device, dial out the call from the communication terminal device to a transfer destination, and transfer the call from the caller. . This call transfer is a method of transferring before the transfer destination responds to the dial transmission from the communication terminal device (pre-answer transfer mode), and a transfer after the transfer destination responds to the dial transmission from the communication terminal device. The method (transfer mode after response) is used.

In the automatic transfer through the analog telephone line, after the call from the caller is received by the communication terminal device, it is hooked to form a hooking signal and a transfer start signal is sent out. Then, after detecting the second dial tone from the exchange, the transfer destination dial number is sent to the line. Then, when the transfer destination responds, the communication terminal device detects the polarity reversal and starts the voice response transmission. Such automatic transfer via an analog telephone line is also referred to as transfer after voice warp.

[0007]

When the communication terminal device is connected to the ISDN line via the terminal adapter, the second dial tone has a frequency, an on / off time, etc. depending on the model of the terminal adapter. The patterns of the characteristics are different. For this reason, there is a problem that the automatic transfer operation as in the case of using an analog telephone line may not be realized.

When the communication terminal device is connected to the ISDN line via the terminal adapter, polarity reversal may not be performed depending on the model of the terminal adapter used. Therefore, when the analog telephone line is changed to the ISDN line using such a terminal adapter, there is a problem that the call transfer service cannot be used.

The present invention has been made in view of the above situation, and when the analog telephone line is changed to the ISDN line, the call transfer service can be used regardless of the model of the terminal adapter. The purpose is to provide a communication terminal device.

[0010]

According to the present invention, a communication terminal device is connected to an ISDN line via a transmission source and a transfer destination and a terminal adapter, and a call is received from the transmission source. A communication terminal device for transferring a call to a transfer destination by transferring during a call, and a dial number of the transfer destination without detecting a second dial tone after a predetermined time has elapsed after the transfer start signal was sent to the terminal adapter. Can be achieved.

Further, the invention according to claim 2 is a communication terminal which is connected to an ISDN line through a terminal adapter and a source and a transfer destination, and transfers a call received from the source to the transfer destination by transferring during a call. The device is characterized in that after the dial number of the transfer destination is transmitted, whether or not the call transfer is possible is determined based on the signal from the transfer destination without detecting the polarity reversal.

Further, the invention according to claim 3 is a communication terminal which is connected to an ISDN line through a terminal adapter and a source and a transfer destination, and transfers a call received from the source to the transfer destination by transferring during a call. After transmitting the transfer start signal to the terminal adapter, the device transmits the dial number of the transfer destination without detecting the second dial tone, and after transmitting the dial number of the transfer destination. The feature is that whether or not transfer during a call is possible is determined based on a signal from a transfer destination without detecting polarity reversal.

According to the first aspect of the present invention, the dial number of the transfer destination is transmitted without detecting the second dial tone. Therefore, even if any terminal adapter having a different pattern of the second dial tone is used, ISDN is used.
It becomes possible to use transfer during a call on the line.

According to the second aspect of the present invention, whether or not the incoming call can be transferred is determined based on the signal from the transfer destination without detecting the polarity reversal. Therefore, even if a terminal adapter that does not detect polarity reversal is used, ISDN
It becomes possible to use transfer during a call on the line.

According to the third aspect of the present invention, the dial number of the transfer destination is transmitted without detecting the second dial tone, and the incoming call is transferred based on the signal from the transfer destination without detecting the polarity reversal. It is judged whether it is possible or not. Therefore, no matter what type of terminal adapter is used, the service for call transfer can be used when the analog telephone line is changed to the ISDN line.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example in which a communication terminal device having an image and call transfer function is arranged. In FIG. 1, reference numerals 1 and 1a are communication terminal devices as a source, 2 is an exchange, 3 is a communication terminal device as a transfer source,
Reference numerals 4 and 5 denote communication terminal devices as transfer destinations, and 6 denotes a terminal adapter. These communication terminals are respectively ISDN
Although connected by a line, the transfer destination communication terminal devices 4, 5
Can be a mobile phone.

The communication terminal device 3 has a call function,
The call transfer from the communication terminal device 1 or 1a of the caller, which is received by the communication terminal device 3, is automatically transferred to the communication terminal device 4 or 5 of the transfer destination by using the call transfer service provided by the line carrier. Further, the communication terminal device 3 receives the image transmitted from the communication terminal device 1, 1a which is the transmission source and stores it in the image memory, and the communication terminal device 3 is the transfer source, and the received image is the transfer destination 4. 5 can also be transferred to the communication terminal device.

When performing such call transfer,
As will be described later in detail, the communication terminal device 3 of the transfer source does not detect the second dial tone (SDT) after transmitting the transfer start signal to the terminal adapter 6, and after the elapse of a predetermined time, the dial number of the transfer destination. Is sent. Further, after the dial number of the transfer destination is transmitted, whether or not the transfer is possible is determined based on the signal from the transfer destination without detecting the polarity reversal.

FIG. 2 is a schematic block diagram showing the control device of the communication terminal device of the present invention. Next, this block diagram will be described. In FIG. 2, the control device 11 of the communication terminal device is a control unit 1 for processing various signals and data.
Have two. The control unit 12 is composed of, for example, a CPU (central processing unit).

The control unit 12 includes a line control unit (NCU) 1
4, modem 15, image memory 16, RAM 17, ROM
18, display unit 19, operation unit 20, reading unit 21, recording unit 2
2. Audio processing unit 23, image codec 26, buzzer 27
Are connected. The line control unit 14 is connected to the ISDN line 13 via the terminal adapter 6 and detects transmission and reception of dial pulses corresponding to the dial number of the other party.

The line control unit 14 includes two telephones 24,
25 can be switched and connected. The telephone 24 can have a built-in answering machine function, and can be used as, for example, a handset (auxiliary telephone). Further, the telephone 25 can be used as an external answering machine.

The image memory 16 stores an image transmitted and received by the communication unit composed of the line control unit 14 and the modem 15 and a read image. The RAM 17 stores management data for reservation transmission or memory reception. In addition, a transfer table in which a transfer destination telephone number is preset is stored. The ROM 18 stores data and programs necessary for various operations of the communication terminal device.

Display unit 19 using a liquid crystal display (LCD)
On the screen, various messages necessary for the operation of the communication terminal device are displayed. Also, FAX (image) standby, TEL (call)
The standby mode such as standby is displayed with characters and icons (patterns). Further, when the line carrier is using the number display (ND) function which is serviced, when the communication terminal device is called, the telephone number of the other party is displayed on the display unit 19 prior to the call. indicate.

Operation unit 20 including a keyboard and a mouse
Indicates various operations and stoppages of the communication terminal device. Also,
Set the magnification of the original image. Further, the operation unit 20
Is equipped with various keys. For example, a copy / facsimile multifunction machine can be used as a copy mode and a facsimile communication mode.
Copy / communication key to select which function
A scanning mode that sets the scanning mode (resolution) of the copy depending on whether the original is image information such as text or photographic information.
There are provided keys for setting various operation modes such as a key for setting a mode, automatic reduction, and automatic recording paper selection mode.

The operation unit 20 has a FAX standby mode, T
EL standby mode, FAX / TEL standby mode, TEL /
Set the fax standby mode. In addition, VW (Voice Warp) for fax transfers and call transfers serviced by line operators
To set. The reading unit 21 reads an image on a document. When reading a two-sided original, the front side image and the back side image are read. The recording unit 22 records an image on recording paper. The image may be recorded on both sides of the recording sheet or on one side of the recording sheet.

The recording unit 22 is provided with an electrophotographic printer, and the received image and the image read by the optical reading system are copied onto recording paper of a fixed size supplied from a paper feed cassette (not shown). In the printer, various data
Can be recorded on recording paper. The voice processing unit 23 includes a voice compression memory that stores the content of the recorded call,
An audio codec for encoding / decoding a digital audio signal is provided. The voice compression memory can store various voice messages.

The control unit 12 reads the image stored in the image memory 16 and transfers the image to a predetermined transfer destination. Further, the recorded content of the call can be read from the voice processing unit 23 and transferred to a predetermined transfer destination, or the recorded message can be read from the voice processing unit 23 and transmitted to the caller. It is also possible to provide a clock unit to count the current time and use the output to print the time at that time on the received document.

When a handset having a built-in answering machine function is used as the telephone set 24, the handset constitutes an auxiliary telephone for communication of a communication terminal device. The external telephone 25 functions as an answering machine that records an incoming call from a communication terminal device that is a sender.

The image codec 26 encodes (encodes) the read image in accordance with the decoding capability of the transmission destination device.
Do) Also, the received image is decoded (decoded), re-encoded by the MMR method or JBIG method with the highest compression rate, and stored in the image memory. The buzzer 27 sounds a call alarm.

From the communication terminal device, voice guidance such as "please call back later" at the time of a call, ISDN line 1
Send to 3. Such voice guidance can be stored in the ROM 18 in advance at the time of manufacturing. Alternatively, the user may blow a message from the telephone 24 and register it in the voice compression memory of the voice processing unit 23.

FIG. 3 is a block diagram partially showing an example of the line control unit 14 shown in FIG. In FIG. 3, the line control unit 14 includes a first switch Sa and a second switch S.
b is provided. Further, the incoming call detection unit 14a, the DC voltage and bell signal generation unit 14b, the off-hook detection unit 14
c is provided. The third switch Sc connects the telephone 24 on the contact c side and connects the external telephone 25 used as an answering machine on the contact d side.

The off-hook detecting section 14c includes a telephone 24,
The current flowing through 25 is detected. Connect the telephone 24 or the external telephone 25 from the NCU 14 with a normal signal line,
The audio signal is transmitted to the external line 13.

The communication terminal device sets whether the incoming call is given priority to a telephone call (TEL) or an image (FAX). In the case of TEL priority, the second switch Sb is b
It is connected to a contact, and when a call signal arrives from the exchange, the bell of the telephone 24 or 25 rings, and the incoming signal detection unit 14a detects the call signal. When the off-hook is not detected even when the calling signal is detected a predetermined number of times, the first switch Sa is turned on to connect the modem 15 to the line and detect the facsimile signal.

In the case of the FAX priority setting, the second switch Sb is connected to the a contact, and the bell does not ring when an incoming call is detected. When the incoming call detection unit 14a detects an incoming call, the first switch Sa is turned on. Next, CNG (ring tone,
That is, when a fax activation signal) is detected, the image is received by the modem 15 and is stored in the image memory for facsimile communication processing. If CNG is not received, an alarm is sounded.

When the setting of transfer during call is set,
When a hooking signal is sent to the terminal adapter 6 after an incoming call, a second dial tone (second dial tone, SDT) is sent from the terminal adapter 6 to the communication terminal device, and the exchange waits for the transfer destination number. Notify that.

4 to 11 are flowcharts showing the processing procedure of the present invention. Next, this flow chart will be described.

(1) The processing program is started in step S1, and it is determined in step S2 whether there is an incoming call. If the result of this determination is NO (hereinafter abbreviated as N), the system waits until an incoming call arrives. If the determination result of step S2 is YES (hereinafter abbreviated as N), step S3
Then, it is judged whether or not it is the FAX standby mode.

(2) If the determination result in step S3 is Y, then the subroutine processing of the FAX communication processing is performed in the processing of step S7. After the FAX communication processing, the line is disconnected in the processing of step S36, and the processing program is ended in step S37. If the determination result in step S3 is N, FAX / TEL or T in step S4 is processed.
It is determined whether any of the EL / FAX standby mode is set.

The FAX / TEL standby mode is a standby mode in which image (FAX) reception has priority over telephone (TEL) reception. The TEL / FAX standby mode is a standby mode in which an incoming call (TEL) has priority over an image (FAX) reception.

When the FAX / TEL standby mode is set, the FAX is prioritized so that the call arrives without ringing the bell. If the FAX is received, the FAX is received and the buzzer is ringed when the FAX is not received. Note that the buzzer does not sound when transferring a call. When the TEL / FAX standby mode is set, the TEL has priority, so the bell rings a predetermined number of times before the incoming call.

(3) If the result of the determination in step S4 is N, then the subroutine processing of the answering machine processing is performed in step S8. After the answering machine processing, the line is disconnected in the processing of step S36, and the processing program is ended in step S37. If the determination result in step S3 is Y, the process proceeds to step S5, and the line carrier supports
Judging whether or not the call transfer (automatic transfer) is set.

(4) If the result of the determination in step S5 is N, FAX / TEL or TE in step S9 is processed.
Performs subroutine processing of L / FAX communication processing. After this processing, the line is disconnected in the processing of step S36, and the processing program is ended in step S37. Step S
When the judgment result of 5 is Y, the first voice message of "please wait for a while" is sent to the sender in the process of step S6.

(5) Then, in the processing of step S10,
The timer sets a time-up of the first set time of 4 seconds. The first set time is set as a grace time for the sender to perform processing. The program timer set in the CPU 12 of FIG. 2 can be used for the process of step S10. Next, in the processing of step S11, it is determined whether or not a ringing tone (CNG) for fax activation is detected.

(6) If the decision result in the step S11 is Y, then a subroutine process of the FAX receiving process is carried out in a process of step S16. After the FAX reception processing, the line is disconnected in the processing of step S36, and the processing program is ended in step S37. If the determination result in step S11 is N, then it is determined whether or not polarity reversal of the telephone line has been detected in the process of step S12. Step S12
If the result of the determination is Y, the line is disconnected in the process of step S36, and the processing program ends in step S37.

(7) If the result of the determination in step S12 is N, it is next determined in step S13 whether or not an intermittent sound (busy) is detected. The determination result of step S13 is Y
If so, the line is disconnected in the processing of step S36, and the processing program is ended in step S37.

As described above, when the determination results in steps S12 and S13 are Y, the line is disconnected because it is the process performed by the sender determining that the transfer is unnecessary.
If the determination result of step S13 is N, it is determined whether or not the first set time of 4 seconds has expired in the process of step S14. If the determination result is N, the process returns to step S10, and steps S10 to S1.
Repeat the loop process of 4.

(8) When the first set time of 4 seconds is up, and the determination result of step S14 is Y, the loop process is exited and the process proceeds to step S15.
In the process of step S15, the second voice message "Call is transferred from now" is sent to the sender.

In this way, steps S6 to S1
In the process of 5, the facsimile communication is performed when the fax activation signal is received within the first set time after the first voice message is sent to the sender after the incoming call. When the first set time has elapsed, a second voice message is sent to the sender,
Notification of transfer during a call. For this reason, the caller can confirm the processing status by voice guidance, and will be kind to the caller who uses the call transfer function.

(9) In the process of step S17 subsequent to the process of step S15, a time-up of the second set time of 2 seconds is set in the timer. The second set time is set to reconsider whether the caller will transfer the call after receiving the voice message. Then step S
In the process of 18, it is determined whether the CNG signal for fax activation is detected.

(10) If the decision result in the step S18 is Y, then FA is executed in the subroutine process of the step S22.
X communication processing is performed, the line is disconnected in the processing of step S36, and the processing program ends in step S37. In this way, the communication terminal device performs the image reception process when it detects the CNG signal for fax activation within the second set time, and therefore it is possible to receive the image even when the fax transmission key operation is delayed at the sender. Become. Therefore, a smooth image receiving process can be performed in consideration of the user's operation.

(11) If the decision result in the step S18 is N, then it is decided whether or not polarity reversal of the telephone line is detected in the process of the step S19. If the result of this determination is N, it is next determined in step S20 whether an intermittent sound (busy) is detected. The determination result of step S19 and step S20 is Y when the caller puts the handset because the caller does not need the transfer during the call, that is, when the caller determines that the transfer is not necessary. As a disconnection, the processing program ends in step S37.

As described above, since the caller receives the voice message for call transfer from the communication terminal device and reconsiders within the second set time to notify the call transfer unnecessary, the communication terminal device is Useless call transfer can be avoided. Also,
The call is transferred even though the caller disconnects the line, and the busy signal is not sent to the transfer destination.

(12) If the result of the determination in step S20 is N, then the second set time 2 is set in step S21.
Determine if the seconds have timed up. If the determination result is N, the process returns to step S17, and the loop process of steps S17 to S21 is repeated. Second
When the set time of is timed up and the determination result of step S21 is Y, the loop process is exited and the process proceeds to step S23.

(13) In the process of step S23, the line is temporarily opened and the hooking signal is transmitted. Next, it is determined in step S24 whether or not the transfer destination dial data is present. The process of step S24 is to determine whether or not the destination to which the call received from the source is transferred is designated as the transfer destination registered in the transfer table.

(14) If the decision result in the step S24 is N, the process shifts to a hooking signal transmission process of a step S34 which will be described later. If the decision result in the step S24 is Y, a third set time, for example, 4 seconds is set in the process of a step S25. The third set time Tc sets the time required for processing for sending the dial number to the transfer destination.

(15) Next, in the processing of step S26, the third
It is determined whether or not the set time of is up. When the result of this determination is N, the system is in a standby state until the time is up. When the third set time is up and the determination result of step S26 becomes Y, the dial number is sent to the transfer destination in the process of step S27. As described above, in the present invention, unlike the case of the analog line, the second dial tone is not detected before the dial number is sent to the transfer destination. Therefore, no matter what type of terminal adapter having a different pattern of the second dial tone is used, the call transfer can be smoothly performed.

(16) Next, in the process of step S28, the timer sets a fourth set time, for example, 20 seconds. The fourth set time sets the time required for the transfer destination to respond to the ringing of a call.

(17) Then, in the processing of step S29,
"I will transfer the call from now on."
If you don't mind, please press the # key. " The third voice message may include information indicating where the caller is, for example, the telephone number of the caller. Next, it is determined whether or not the fourth set time has expired in the process of step S30.

(18) If the result of this determination is Y, the process proceeds to step S33, and the number of times specified, for example, 3
It is determined whether the time is up more than once. If the determination result is N, the process returns to step S28, and the loop process of steps S28 to S33 is repeated.
If the determination result of step S33 is Y, step S3
The process shifts to the processing of No. 4, and a hooking signal, that is, a transfer start signal is sent out.

In this way, steps S28 to S
In the process of 33, the transfer destination sets a sufficient time for considering the correspondence based on the voice message. Therefore, when transferring a call, the transfer destination can perform processing according to the situation. Also, if the transfer destination is a mobile phone and you have set up voice recording, a response message prompting you to make a recording from the mobile phone collides with a voice message from the communication terminal device, and the voice message is sent to the mobile phone. -There is a problem that the sound may not be recorded, resulting in a silent recording state. For this reason,
The voice message in step S30 is repeatedly sent after a relatively long time, which is a predetermined number of times or more, so that the transfer destination can respond.

(19) In the processing of step S30, if the determination result is N because the fourth set time does not expire, then it is determined whether or not a busy signal is detected in the processing of step S31. If the determination result is Y, the process proceeds to step S34 and a hooking signal is sent out. The determination result of step S31 becomes Y when the transfer destination places the handset, that is, when the exchange detects that the transfer destination places the handset, and the line is busy on the communication terminal device that is the transfer source. This is a case where a signal (a transfer refusal signal to the communication terminal device) is transmitted.

(20) If the determination result in step S31 is N, then in step S32, the above step S31 is performed.
The dial tone multi-frequency (DTMF) corresponding to the # key operation notified to the transfer destination in the processing of 29.
It is determined whether or not the "#" tone of No. has been detected. If the determination result is N, the process returns to step S31. If the decision result in the step S32 is Y, the incoming call transfer has been made, so the line is disconnected in the process of the step S36, and the process program is ended in the step S37.

As described in the processing of steps S27 to S32, in the present invention, step S2
After sending the dial number to the transfer destination in the process of 7, the communication terminal device does not detect the polarity reversal and notifies the transfer destination of the # key operation in step S29. And step S3
In the processing of No. 2, it is judged that the incoming call transfer is performed by detecting the signal from the transfer destination, that is, the "#" tone. As described above, according to the present invention, whether or not the call transfer is possible is determined based on the signal from the transfer destination. Therefore, even if the analog telephone line is changed to the ISDN line, the automatic call transfer service can be used regardless of the model of the terminal adapter.

(21) Next, after sending a hooking signal in the process of step S34, "Called but no response is received in the process of step S35. Excuse me,
Please call back later. 4th voice message
Message to the sender. Next, the line is disconnected in step S36, and the processing program ends in step S37.

[0065]

As described above in detail, in the present invention, when the analog telephone line is changed to the ISDN line, the automatic call transfer service is used regardless of the model of the terminal adapter. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram of an example in which a communication terminal device according to an embodiment of the present invention is arranged.

FIG. 2 is a block diagram showing a configuration of a control device of a communication terminal device.

FIG. 3 is a block diagram partially showing a configuration of a control device of a communication terminal device that performs call transfer.

FIG. 4 is a flowchart showing a processing procedure of the present invention.

FIG. 5 is a flowchart showing a processing procedure of the present invention.

FIG. 6 is a flowchart showing a processing procedure of the present invention.

FIG. 7 is a flowchart showing a processing procedure of the present invention.

FIG. 8 is a flowchart showing a processing procedure of the present invention.

FIG. 9 is a flowchart showing a processing procedure of the present invention.

[Explanation of symbols]

1,1a Originator 2 exchanges 3 Communication terminal device (transfer source) 4, 5 transfer destination 6 terminal adapter (TA) 11 Control device 12 Central processing unit (CPU) 14 Line control unit (NCU) 15 modem 16 image memory 19 Display 20 Operation part 23 Voice processing unit 24 telephones 25 External telephone 26 image codecs 27 Buzzer

Claims (3)

[Claims] 1. A communication terminal device, which is connected to an ISDN line through a terminal adapter and a caller and a transfer destination and transfers a call received from the caller to the transfer destination by a call transfer, a transfer start signal. Is transmitted to the terminal adapter after a predetermined time has elapsed, and the dial number of the transfer destination is transmitted without detecting the second dial tone. 2. A communication terminal device which is connected to an ISDN line via a terminal adapter and a caller and a transfer destination and transfers a call received from the caller to the transfer destination by transferring during a call. A communication terminal device, characterized in that, after sending a dial number, whether or not transfer during a call is possible is judged based on a signal from a transfer destination without detecting polarity reversal. 3. A communication terminal device, which is connected to an ISDN line through a terminal adapter and a caller and a transfer destination, and transfers a call received from the caller to the transfer destination by call transfer, the transfer start signal. After a predetermined time has passed from the transmission to the terminal adapter, the dial number of the transfer destination is transmitted without detecting the second dial tone, and the polarity inversion is not detected after transmitting the dial number of the transfer destination. A communication terminal device, comprising: determining whether or not transfer during a call is possible based on a signal from a transfer destination.