JP3228160B2 - 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 device, and more particularly to a communication terminal device capable of receiving, from a switching center, transmission side information capable of confirming the transmission side terminal prior to communication with the transmission side terminal. The present invention relates to a communication terminal device.

[0002]

2. Description of the Related Art Nippon Telegraph and Telephone Corporation (NTT) is a service (calling telephone number notification service (provisional name)) for notifying a receiving terminal of a telephone number or the like of a calling terminal before a telephone call on a telephone network (PSTN). We are considering providing. In this service, a receiving terminal receives information such as a telephone number of a calling terminal by a modem signal from a subscriber line exchange prior to communication with a calling terminal.

[0003] Such an outgoing telephone number notification service is:
Although it has already been provided in the ISDN (Integrated Services Digital Network) network, the number of subscribers of the ISDN network is small, so that a technique for effectively utilizing the calling telephone number notification service has not been proposed so far.

[0004] However, since the number of telephone network subscribers is far greater than the number of ISDN network subscribers, it is desired to provide high value-added services by effectively utilizing the outgoing telephone number notification service in the telephone network. .

[0005]

On the other hand, the following technical problems have been raised regarding the outgoing telephone number notification service in the telephone network. According to the technical document “Interface of Calling Phone Number Notification Service (Test Service)” issued by NTT, the receiving terminal sends a primary response signal when it cannot receive the modem signal from the local exchange normally. It is described that the sequence should be continued by sending a reception completion signal after the timing of 5 seconds is taken.

[0006] According to such a specification, the receiving terminal receives a call without being able to specify the calling terminal. In this case, even the person who wants to reject the call will receive the call,
There is a risk of confidentiality problems.

[0007] The present invention has been made to solve the above-mentioned problems, and when the originating terminal cannot be specified,
An object of the present invention is to provide a communication terminal device capable of preventing reception of an incoming call and maintaining confidentiality of communication.

[0008]

In order to achieve the above object, a communication terminal device according to the first aspect of the present invention provides a communication terminal device capable of confirming a caller terminal prior to communication with the caller terminal. A communication terminal device capable of receiving
With determining whether or not the received modem signals, when receiving the modem signal, non notification reason Calling Party
Whether or not a signal sequence error has occurred
A normal reception determining means for determining whether or not a signal data error has occurred; and, when the modem signal cannot be received, when a non-notification reason of the calling side information has been received,
When a sequence error occurs, signal data error
And an incoming call rejecting unit that rejects an incoming call from the calling terminal in any of the cases where the error occurs .

Further, in the communication terminal device according to the second aspect,
2. The communication terminal device according to claim 1, wherein said call rejection means is configured to output the caller side information when the modem signal cannot be received.
Sequence error when receiving the non-notification reason of
Occurs, and if a signal data error occurs,
In either case , the reception of the call from the originating terminal is rejected by transmitting the reception completion signal after a predetermined time elapses so that the reception unit times out waiting for reception of the reception completion signal in the exchange.

Further, in the communication terminal device according to the third aspect,
2. The communication terminal device according to claim 1, wherein said call rejection means is configured to output the caller side information when the modem signal cannot be received.
Sequence error when receiving the non-notification reason of
Occurs, and if a signal data error occurs,
In any case , after transmitting the reception completion signal to the exchange,
It is characterized by rejecting an incoming call from a calling terminal by ignoring a call signal from an exchange.

[0011] In the communication terminal device according to the fourth aspect,
2. The communication terminal device according to claim 1, wherein said call rejection means is configured to output the caller side information when the modem signal cannot be received.
Sequence error when receiving the non-notification reason of
Occurs, and if a signal data error occurs,
In either case , after transmitting a secondary response signal to the call signal from the exchange, the line is released to reject an incoming call from the calling terminal.

[0012]

According to a fifth aspect of the present invention, in the communication terminal device according to any one of the first to fourth aspects, out of the non-notification reasons of the calling side information, the calling side information is not transmitted. If a non-notification reason that the detailed reason cannot be notified cannot be notified or a non-notification reason that the notification cannot be performed because the call originated from a public telephone is received, rejection of the incoming call by the incoming call rejection unit is prohibited, and It is characterized by further comprising a control means for controlling to receive an incoming call.

According to a sixth aspect of the present invention, in the communication terminal device according to any one of the first to fourth aspects, when the non-notification reason of the calling side information is received, a modem signal is transmitted. Selection means for the user to select whether or not to reject an incoming call from the calling terminal for each of the following cases: reception failure, signal sequence error occurrence, and signal data error occurrence; And a call rejection control means for controlling the call rejection by the call rejection means based on information selected by the user by the means.

Further, in the communication terminal apparatus according to claim 7, wherein the
The communication terminal device according to any one of claims 1 to 6 , wherein the communication terminal device capable of receiving the calling side information from an exchange includes: 23 is a terminal that can provide an interface.

The communication terminal device according to the first aspect is a terminal capable of receiving transmission side information from an exchange before communicating with the transmission side terminal. However, there are cases where the sender information cannot be normally received. Therefore, in the communication terminal device according to the first aspect, the normal reception determining unit determines whether or not the modem signal has been successfully received and, when the modem signal is received, receives the non-notification reason of the transmission side information. Or not
Whether a signal sequence error has occurred,
Determine whether a data error has occurred, and if the modem signal cannot be received, receive the non-notification reason of the calling side information.
If a signal sequence error occurs,
In any of the cases where a data error of a signal has occurred , the incoming call from the originating terminal is rejected by the incoming call rejecting means.

[0017] Thus, when the transmission side information cannot be normally received and the transmission side terminal cannot be specified, it is possible to prevent an incoming call from being accepted and improve the confidentiality of the communication.

[0018] Incidentally, call rejection means, as in the invention of claim 2, wherein, when it can not receive the modem signals, outgoing
The sequence of the signal when the side information non-notification reason is received
If an error occurs, a signal data error has occurred
In any of the cases , after a predetermined time elapses so as to time out waiting for reception of a reception completion signal in the exchange,
By transmitting the reception completion signal, it is possible to reject an incoming call from the calling terminal.

For example, the timing at which the exchange receives the primary response signal from the receiving terminal (the communication terminal device according to the present invention) and then transmits the transmitting side information to the receiving terminal is a maximum of 3 seconds. If the reception waiting time of the reception completion signal after information transmission is 7 seconds, a time of 10 seconds or more is specified in advance, and the communication terminal device according to claim 2 completes reception after the specified time elapses. What is necessary is just to transmit a signal.

Further, call rejection means, as in the invention of claim 3, wherein, when it can not receive the modem signals, outgoing
The sequence of the signal when the side information non-notification reason is received
If an error occurs, a signal data error has occurred
In either case, after the reception completion signal is transmitted to the exchange, the incoming signal from the originating terminal can be rejected by ignoring the calling signal from the exchange. In this case, the communication is continued until the calling signal from the exchange ends, or strictly, until the calling terminal gives up communication. When the calling signal ends, the mode exits the mode in which the calling signal is ignored and returns to the normal initial state.

Further, call rejection means, as in the invention of claim 4, wherein, when it can not receive the modem signals, outgoing
The sequence of the signal when the side information non-notification reason is received
If an error occurs, a signal data error has occurred
In either case , after transmitting the secondary response signal to the calling signal from the exchange, the line is released, so that the incoming call from the calling terminal can be rejected. In this case, by releasing the line immediately after transmitting the secondary response signal, the operation time for rejecting the incoming call from the calling terminal can be reduced. In addition, there is an advantage that the originating terminal does not need to wait for a response from the receiving side until it gives up the call, even though the terminal is not connected.

[0022] By the way, and if it does not receive normally the calling party information, when receiving the non-notification reason of the calling party information, if the sequence error of the signal occurs, if the signal data error has occurred This is one of the cases.

The non-notification reason when the non-notification reason of the calling side information is received is transmitted when the exchange cannot notify the calling side information, and the calling side terminal permits the notification of the calling side information. Non-notification reason (code P) indicating that notification is not possible due to a procedure not to be performed, non-notification reason (code O) indicating that the detailed reason why the calling party information is not notified cannot be notified (code O), There is a notification reason (code C) and the like.

The case where a modem signal cannot be received is a case where a modem signal from an exchange cannot be received at all.

The case where a signal sequence error occurs is defined in ITU-T Recommendation V.3. This is a signal sequence error specified in 23, for example, a case where STX (start of text) is received but ETX (end of text) cannot be received, and normal data is not received.

The case where a data error occurs in a signal is defined in ITU-T Recommendation V.3. This is a data error of the signal specified in 23, such as a CRC frame error, and normal data is not received.

The case where the codes O and C are received among the above non-reporting reasons of the transmitting side information is a case where the transmitting side information cannot be reported due to the restriction of the network side regardless of the intention of the transmitting side terminal.

Therefore, in the invention described in claim 5 , a non-notification reason (code O) indicating that the detailed reason why the calling side information is not notified cannot be notified or a non-notifying reason (code O cannot be notified because the call originated from a public telephone). When the code C) is received, the control unit prohibits the rejection of the incoming call by the above-described incoming call rejection unit, and controls to accept the incoming call from the calling terminal. This makes it possible to avoid rejection of the incoming call when the sending side information cannot be notified due to the restriction on the network side.

Next, in the invention according to claim 6 , when the user receives the non-notification reason of the calling side information by the selection means, the modem signal cannot be received, the signal sequence error occurs, the signal For each of the cases where a data error has occurred, a selection is made as to whether or not to reject an incoming call from the calling terminal. Then, based on the information selected by the user, the incoming call rejection control means controls whether or not to reject the incoming call by the incoming call rejection means.

Thus, the user can select whether or not to reject the incoming call in various cases where the calling side information cannot be received, and control of the incoming call rejection operation based on the selected information can be realized.

As the communication terminal device, for example, a facsimile device can be applied. Further, in addition to the above, prior to communication with the transmitting side terminal, it is possible to apply all communication terminal devices capable of receiving the transmitting side information from the exchange. As the communication terminal device capable of receiving the calling side information from the exchange, as in the invention of claim 7 ,
V. A terminal that can provide an H.23 interface can be applied.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment corresponding to the first and second aspects of the present invention will be described below.

[Configuration of Communication Terminal] First, the configuration of the communication terminal of the first embodiment will be described. FIG. 1 shows a block diagram of a communication terminal device 10 of the present embodiment. The CPU 12 shown in FIG. 1 controls the entire communication terminal device 10, and the CPU 12 has a ROM 14 and a CP.
First RAM 1 as working memory for processing by U12
6 are connected. Of these, the ROM 14 contains the CPU 1
Various control programs to be executed in Step 2 are stored, and control information and various data used by the control programs are temporarily stored in the first RAM 16.

The CPU 12 has an RTC (Real Tim
e Clock) 18, keyboard 20 and display 22
Are connected respectively. The CPU 12 has an RTC 18
Recognizes the current time from the built-in clock. Also, CPU
12 detects the state of the keyboard 20 to recognize the operator's instruction, and can use the display 22 to display various information for the operator.

Further, the CPU 12 includes a scanner 24,
Third RAM 26, printer 28, encoding / decoding device 3
0, second RAM 32, modem 34 and network controller (NC
U) 36 is connected. The encoding / decoding device 30 has an encoding function of encoding image data based on facsimile communication standards and a decoding function of restoring the encoded image data. The CPU 12 controls these scanners 2
4. Control signals are sent to the third RAM 26, the printer 28, the encoding / decoding device 30, the second RAM 32, the modem 34, and the NCU 36, and the operation state of each device is detected.

The scanner 24 and the printer 28 are connected to a third RAM 26, respectively. The scanner 24 reads an original, and stores image data of the read original in the third RAM.
26. The printer 28 prints the image data stored in the third RAM 26 on a predetermined sheet. The image data read by the scanner 24 is directly used by the printer 2.
8, the communication terminal device 10 can be used as a copying machine.

The third RAM 26 is connected to the encoding / decoding device 30, and the encoding / decoding device 30
It is connected to the RAM 32. The image data stored in the third RAM 26 is encoded by the encoding function of the encoding / decoding device 30, and the encoded image data is
It is stored in the RAM 32. The encoded image data stored in the second RAM 32 is transmitted to the telephone network (PSTN) 38 via the modem 34 and the NCU 36. The communication terminal device 10 is connected to the exchange 50 via the telephone network 38.

Conversely, image data transmitted from an external device via the telephone network 38 is transmitted to the NCU 36 and the modem 3
4 is stored in the second RAM 32. This second RA
The image data stored in the M32 is decoded by the decoding function of the encoding / decoding device 30 and the third RAM 26
Is stored.

Incidentally, the communication terminal device 10 of the present embodiment
Has a function of receiving a caller ID notification service under the control of the CPU 12. That is, when receiving a call, prior to communication with the calling terminal, information on the telephone number of the calling terminal (hereinafter referred to as the caller number) can be received from the exchange 50.

The communication terminal device 10 has a function of judging whether or not the caller ID has been normally received from the exchange 50 under the control of the CPU 12, and a function of the caller if the caller information has not been normally received. It has a function of controlling to reject incoming calls from terminals.

[Connection Operation Sequence in Caller Number Notification Service] Next, a general connection operation sequence in the caller number notification service will be outlined with reference to FIG. FIG. 2 shows a sequence diagram described in an interface (for a test service) of an outgoing telephone number notification service (tentative name) issued by NTT.

As shown in FIG. 2, first, in accordance with the calling operation (dialing) of the originating terminal, the exchange which has specified the receiving terminal reverses the polarity of the receiving terminal (a) and then receives the ID. Terminal activation signal (CAR: 15-20H
z, ON / OFF for 0.5 seconds) (b).

The receiving terminal that has detected the ID receiving terminal activation signal connects the line (forms a DC loop) by transmitting the primary response signal (c).

The exchange that has received the primary response signal from the receiving terminal is in accordance with ITU-T Recommendation V. The caller ID is transmitted by a signal conforming to H.23 (d).

After receiving the caller number, the receiving terminal determines whether or not to receive the call (accepts the incoming call). If it determines that the call is to be received, the receiving terminal transmits a reception completion signal to immediately release the line ( The DC loop is cut) (e).

The exchange which has received the reception completion signal sends a calling signal (IR: 15 to 20 Hz, 1 second ON, 2 second OFF) (f).

The subsequent sequence is the same as the normal incoming call operation (g, h, i). When a response is made, a line is connected (a DC loop is formed) and communication is started.

[Operation of First Embodiment] Next, the operation of the first embodiment will be described. Here, an example in which the inventions of claims 1 and 2 described in the claims are applied to the connection operation sequence in the caller ID notification service will be described with reference to FIGS.

At step 102 in FIG. 7, the reception of a signal (paging signal or ID receiving terminal activation signal) of 15 to 20 Hz from the exchange 50 is waited.
04, and determines whether or not the received signal is an ID receiving terminal start signal (ON / OFF for 0.5 seconds) (call signal (1
Seconds ON, 2 seconds OFF). If the received signal is not an ID receiving terminal activation signal but a calling signal,
Proceed to step 106 to perform normal communication.

On the other hand, the signal received at step 104
D receiving terminal activation signal (sequence b in FIG. 4)
1), proceed to step 108 to connect a line by sending a primary response signal (sequence c1 in FIG. 4). In the next step 110, a 10-second timer is started, and in the next step 112, reception of a modem signal is waited.

If a modem signal has been received, the process proceeds to step 114, where it is determined whether or not the calling telephone number has been normally received as follows.

In the first embodiment, when the calling telephone number cannot be received normally, when the calling telephone number non-notification reason is received, when the modem signal itself cannot be received normally, ETX cannot be received after receiving STX. If CRC
Are assumed when four frame errors occur. Therefore, in step 114, whether the received modem signal is normal or not, the reason for notifying the outgoing telephone number (P, O,
C), whether ETX has been received, whether there is a CRC frame error, and the like, to determine whether or not the calling telephone number has been normally received.

Here, when the calling telephone number is normally received, the determination of normal reception is made in step 114, and the process proceeds to step 116, where normal reception processing is performed.

On the other hand, if the calling telephone number cannot be received normally, the received signal is ignored and the process returns to step 112 for waiting for the reception of the modem signal.

From the start of modem signal reception waiting, 1
If the calling telephone number cannot be normally received within 0 seconds, a timeout occurs in step 118, and the flow advances to step 120 to send a reception completion signal to the exchange 50 to release the line (sequence e1 in FIG. 4). At this time, after sending the primary response signal to the exchange 50 in step 108,
Since 0 seconds have elapsed, the exchange 50 has already timed out waiting for reception of a reception completion signal. Therefore, even if the reception completion signal is transmitted to the exchange 50 in step 120,
The call signal is no longer sent from exchange 50, and the communication ends.

As described above, in the first embodiment, the exchange waits for the outgoing telephone number with an upper limit of 10 seconds which is set to be a timeout for receiving the reception completion signal, and cannot normally receive the outgoing telephone number. In this case, control is performed to reject the incoming call. Therefore, it is possible to prevent an incoming call from being accepted in a situation where the caller cannot be identified,
Communication confidentiality can be improved.

In the first embodiment, an alarm (display, voice, etc.) is generated when waiting for the reception of a calling telephone number with an upper limit of 10 seconds to prompt the operator to intervene. May select whether or not to continue the sequence. Here, if it is selected to continue the sequence, the subsequent processing is continued without interrupting the sequence.

[Second Embodiment] A second embodiment according to the third aspect of the present invention will be described below. Note that the configuration of the communication terminal device according to the second embodiment is the same as the configuration of the communication terminal device according to the first embodiment (see FIG. 1), and a description thereof will be omitted.

Next, the operation of the second embodiment will be described with reference to FIGS. In addition, in the flowchart of FIG.
The same processes as those in FIG. 7 are denoted by “A” at the end of the step numbers.

After the line is connected in step 108A of FIG. 8 (sequence c2 in FIG. 5), 5 is set in the next step 109.
Start the second timer. In the second embodiment, in the next steps 112A to 118A, the reception of the modem signal is waited until the transmission telephone number can be normally received, with a time limit of 5 seconds from the start of the reception of the modem signal.

Then, 5 minutes from the start of waiting for reception of the modem signal.
If the calling telephone number cannot be received normally within seconds, a timeout occurs in step 118A, and a
Then, the line is released by transmitting a reception completion signal to the exchange 50 (sequence e2 in FIG. 5). At this time, since only five seconds have elapsed since the primary response signal was sent to the exchange 50 in step 108A, the exchange 50 has not yet timed out waiting for reception of the reception completion signal. Therefore, a call signal is transmitted from exchange 50 to communication terminal apparatus 10 (sequence f2 in FIG. 5).

Therefore, in the next step 122, the exchange 5
Wait for a call signal from 0, and if a call signal is received,
Proceeding to step 123, it is determined whether or not the calling signal has disappeared. Then, without waiting for a response to the exchange 50, the process is terminated after waiting for the call signal to disappear.

As described above, in the second embodiment, the exchange waits for the calling telephone number with the upper limit of 5 seconds set so as to be waiting for the reception completion signal, and cannot normally receive the calling telephone number. In this case, after transmitting the reception completion signal to the exchange 50, the calling signal from the exchange 50 is ignored, and the process is terminated after the calling signal disappears.

By performing such incoming call rejection control, it is possible to prevent an incoming call from being accepted in a situation where the caller cannot be specified, and to improve the confidentiality of communication.

[Third Embodiment] Hereinafter, a third embodiment corresponding to the invention of claim 4 described in the claims will be described. Note that the configuration of the communication terminal device according to the third embodiment is the same as the configuration of the communication terminal device according to the first embodiment (see FIG. 1), and a description thereof will be omitted.

Next, the operation of the third embodiment will be described with reference to FIGS. In the flowchart of FIG. 9,
The same processes as those in FIG. 8 are denoted by “A” at the end of the step numbers.

In steps 112A to 118A of FIG. 9, the reception of the modem signal is waited until the transmission telephone number can be normally received, with a time limit of 5 seconds from the start of the reception of the modem signal.

Then, 5 minutes from the start of waiting for reception of the modem signal.
If the calling telephone number cannot be received normally within seconds, a timeout occurs in step 118A, and a
Then, the line is released by sending a reception completion signal to the exchange 50 (sequence e3 in FIG. 6). At this time, since only five seconds have elapsed since the primary response signal was sent to the exchange 50 in step 108A, the exchange 50 has not yet timed out waiting for reception of the reception completion signal. Therefore, a call signal is transmitted from exchange 50 to communication terminal apparatus 10 (sequence f3 in FIG. 6).

Therefore, in the next step 122A, a call signal from the exchange 50 is waited. If the call signal is received, the process proceeds to step 124, where the secondary response signal is sent to the exchange 50.
To connect the line once (sequence g3 in FIG. 6). Then, in the next step 126, the line is released by sending a disconnection signal to the exchange 50 (FIG. 6).
Sequence j3), the communication is terminated.

As described above, according to the third embodiment, when a calling telephone number cannot be received normally, a secondary response signal is transmitted in response to a call signal from the exchange, and the line is immediately released, whereby Reject incoming calls from the calling terminal.

By performing such incoming call rejection control, it is possible to prevent an incoming call from being accepted in a situation where the caller cannot be specified, and to improve the confidentiality of communication.
Further, since the line is released immediately after transmitting the secondary response signal, the operation time for rejecting the incoming call from the calling terminal can be reduced. Even on the transmitting side terminal, there is an advantage that it is not necessary to keep waiting for a response from the receiving side until the user gives up the call even though the terminal is not connected.

[Fourth Embodiment] A fourth embodiment according to the fifth aspect of the present invention will be described below. Note that the configuration of the communication terminal device according to the fourth embodiment is the same as the configuration of the communication terminal device according to the first embodiment (see FIG. 1), and a description thereof will be omitted.

Next, the operation of the fourth embodiment will be described with reference to FIG. In the flowchart of FIG. 10, "A" is added to the end of the step number for the same processing as in FIG.

In step 108A of FIG. 10, the line is connected, and in the next step 110A, a 10-second timer is started.
After that, in step 112A, the process waits for reception of a modem signal.
Proceed to 7, and among the non-notification reasons of the calling telephone number, the non-notification reason (code O) indicating that the detailed reason that the calling party information is not notified cannot be notified or the non-notification reason indicating that notification cannot be performed because the call is from a public telephone It is determined whether (code C) has been received.

Here, if the non-notification reason codes O and C have not been received, the flow advances to step 118A to determine the timeout as in the first to third embodiments. If O and C have been received, the process proceeds to step 116A, where an incoming call from the calling terminal is accepted, and normal reception processing is performed.

As described above, in the fourth embodiment, when the codes O and C of the non-notification reason are received, that is, when the calling side information cannot be notified due to restrictions on the network side, the incoming call from the calling side terminal is accepted. Control to avoid being rejected.

[Fifth Embodiment] Hereinafter, a fifth embodiment corresponding to the invention of claim 7 will be described. In the communication terminal device 10 according to the fifth embodiment, whether to permit or reject an incoming call in various cases where the outgoing telephone number cannot be normally received is set in advance by the user, and the setting information is shown in FIG. It is stored in the RAM (1) 16 in such a table format.

Next, the operation of the fifth embodiment will be described with reference to FIG. In the flowchart of FIG. 11, the same processes as those in FIG. 7 have “A” appended to the end of the step numbers.

At steps 108A to 118A in FIG. 11, the reception of the modem signal is waited until the calling telephone number can be normally received, with a time limit of 10 seconds from the start of the reception of the modem signal.

If the modem signal is received but the calling telephone number cannot be received normally, step 11 is executed.
A negative determination is made in 4A, and the flow advances to step 132 to analyze the details of the error. Specifically, the error contents are the case of receiving the code P of the calling telephone number non-notification reason, the case of receiving the code O of the calling telephone number non-notifying reason, and the case of receiving the calling telephone number non-notifying reason described in FIG. Code C received, modem signal itself not received properly, S
It specifies which of the six cases, that is, the case where ETX cannot be received after TX reception and the case where a CRC frame error has occurred, corresponds to.

When the analysis of the error content is completed, in the next step 134, referring to the setting information in FIG. 3, the processing method (reception permitted or rejected) corresponding to the error content is read. In the next step 136, it is determined whether or not the incoming call is permitted as a processing method. If the incoming call is permitted, the process proceeds to step 116A to perform a normal receiving process, and if the incoming call is rejected, the process ends.

According to the fifth embodiment, whether to permit or reject an incoming call is determined based on a processing method (incoming permission or rejecting incoming call) corresponding to various error cases set in advance by the user. Can be controlled.

In the fifth embodiment, an error message is set in advance for each of the six error cases shown in FIG. 3, and when an error occurs, an error message corresponding to the error case is displayed on the display 22. By doing so, the operator may be notified of the details of the error. In addition, an alarm (display, sound, etc.) may be generated when an error occurs, thereby prompting the operator to intervene and allowing the operator to select whether or not to continue the sequence. Here, if it is selected to continue the sequence, the subsequent processing is continued without interrupting the sequence.

[0084]

According to the present invention, it is possible to prevent the reception of an incoming call when the transmission side information cannot be normally received and the transmission side terminal cannot be specified, and the confidentiality of communication can be improved. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a communication terminal device according to each embodiment.

FIG. 2 is a diagram showing a general connection operation sequence in a caller ID notification service.

FIG. 3 is a diagram showing setting information for setting whether to permit or reject an incoming call in various cases in which a calling telephone number cannot be normally received.

FIG. 4 is a diagram showing a connection operation sequence in the first embodiment.

FIG. 5 is a diagram showing a connection operation sequence in the second embodiment.

FIG. 6 is a diagram showing a connection operation sequence in the third embodiment.

FIG. 7 is a flowchart illustrating a control routine according to the first embodiment.

FIG. 8 is a flowchart illustrating a control routine according to a second embodiment.

FIG. 9 is a flowchart illustrating a control routine according to a third embodiment.

FIG. 10 is a flowchart illustrating a control routine according to a fourth embodiment.

FIG. 11 is a flowchart illustrating a control routine according to a fifth embodiment.

[Explanation of symbols]

 Reference Signs List 10 communication terminal device 12 CPU 20 keyboard 38 telephone network 50 exchange

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hideki Fujii 3-7-1, Fuwa, Iwatsuki-shi, Saitama Fuji Xerox Co., Ltd. Iwatsuki Office (56) References JP-A-5-316202 (JP, A) JP-A-5-316202 Hei 7-235979 (JP, A) Japanese Patent Laid-Open No. Hei 9-36952 (JP, A) "Toward the provision of an outgoing telephone number display service", NTT Technical Journal, Telecommunications Association, November 1, 1996, 8, No. 11, p. 8-26 (58) Field surveyed (Int. Cl. ⁷ , DB name) H04M 1/00 H04M 1/24-1/62 H04M 1/66-1/82 H04M 11/00-11/10

Claims (7)

(57) [Claims] 1. A communication terminal device capable of receiving, from an exchange, transmission-side information capable of confirming the transmission-side terminal before communication with the transmission-side terminal, and determining whether a modem signal has been received. Judgment and, when the modem signal is received, the reason for not reporting the calling side information
Whether or not a signal sequence error has occurred
Whether, and normal reception determination means for signal data error, it is determined whether the occurred, it can not receive the modem signal, the non-sheet Calling Party
Signal sequence error occurs when a reason is received
One of the cases when a signal data error occurs
A communication terminal device comprising: an incoming call rejecting unit that rejects an incoming call from a calling terminal in the case of (1). 2. The call rejection means, when the modem signal cannot be received, a non-communication of the calling side information.
Signal sequence error occurs when a reason is received
One of the cases when a signal data error occurs
The method according to claim 1, wherein in the case of (1), an incoming call from the originating terminal is rejected by transmitting a reception completion signal after a predetermined time elapses so that a reception completion signal reception waiting timeout occurs in the exchange. Communication terminal device. 3. The call rejection means, when the modem signal cannot be received, a non-communication of the calling side information.
Signal sequence error occurs when a reason is received
One of the cases where a signal data error occurs
2. The communication terminal device according to claim 1, wherein, in the case of (1), after receiving the reception completion signal to the exchange, the incoming call from the originating terminal is rejected by ignoring the call signal from the exchange. 4. The incoming call rejection means, when the modem signal cannot be received , the non-communication of the transmitting side information.
Signal sequence error occurs when a reason is received
One of the cases where a signal data error occurs
2. The communication terminal device according to claim 1, wherein, after transmitting a secondary response signal to the calling signal from the exchange, the line is released to reject an incoming call from the calling terminal. . 5. A non-notification reason for not being able to notify a detailed reason for not being notified of the calling-side information or a non-notifying reason for not being able to be notified because the call originated from a public telephone is received among the non-notification reasons of the calling-side information. 5. The communication terminal device according to claim 1, further comprising a control unit that prohibits the call rejection by the call rejection unit and accepts a call from the calling terminal. 6. A method for receiving a non-notification reason of calling side information, a case where a modem signal cannot be received, a case where a signal sequence error has occurred, and a case where a signal data error has occurred. Selection means for the user to select whether to reject the incoming call, based on information selected by the user by the selection means,
The communication terminal device according to claim 1, further comprising: an incoming call rejection control unit that controls incoming call rejection by the incoming call rejection unit. 7. A communication terminal device capable of receiving the transmission side information from an exchange, The communication terminal device according to any one of claims 1 to 6 , wherein the communication terminal device is a terminal that can provide 23 interfaces.