JPH09270870A - Communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a communication terminal equipment to surely receive a call number notice service, without being conscious of a timing of starting the call number notice service by an exchange side. SOLUTION: When a 16Hz call signal is sent from an exchange, based on a call from a caller, the on-time and the off-time of the call signal are respectively measured by timers 17, 18 to detect a dial pattern of the call signal. A CPU 7 discriminates whether the 16Hz signal from the exchange is an ID reception terminal start signal for the notice service or a general call signal to call a called party, based on the detected dial pattern (that is, on/off time). Then the CPU 7 executes a call reception procedure corresponding to the notice service, when the 16Hz signal is the ID reception terminal start signal and executes a usual call reception procedure, when the 16Hz signal is the general call signal.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a communication terminal device such as a telephone or a facsimile device. More specifically, the present invention relates to a communication terminal device capable of receiving a service (source number notification service) of notifying a called party of a telephone number of a calling party from an exchange.

[0002]

2. Description of the Related Art In recent years, a service (source number notifying service) for notifying a telephone number of a calling party from a switchboard to a communication terminal device such as a telephone or a facsimile machine on the called side has been put into practical use. In this calling number notification service, a communication procedure as shown in FIG. 4 is performed between the exchange and the communication terminal device on the called side. That is, when a dial call is made at the source, as shown in FIG. 4, the polarity of the current flowing through the telephone line is first reversed in the exchange. Next, an ID reception terminal activation signal of 16 Hz is transmitted from the exchange to the communication terminal device. This ID receiving terminal activation signal is specially prepared for the sender number notification service, and FIG.
As shown in (a), the off time of 0.5 seconds is set to 0.
It is a 16 Hz signal transmitted intermittently for 5 seconds each.

The communication terminal device on the called side receives I from the exchange.
When the D receiving terminal activation signal is detected, the telephone line is closed to form a DC loop with the exchange. When the formation of this DC loop is detected by the exchange as a primary response signal, the data of the source telephone number is sent from the exchange to the communication terminal device by FS.
It is transmitted as a K (frequency modulation) signal. Upon receiving the telephone number data from the exchange, the communication terminal device temporarily opens the telephone line to open the DC loop with the exchange. When the exchange detects the opening of the DC loop as a reception completion signal, the exchange sends a general message to the communication terminal device.
A 6 Hz ringing signal is transmitted. This calling signal is shown in FIG.
As shown in (b), it is a 16 Hz signal that is intermittently transmitted for 1 second with an off time of 2 seconds.
The calling pattern is different from the ID receiving terminal activation signal shown in FIG. The exchange transmits a ringback tone to the caller while transmitting a call signal to the communication terminal device.

Here, when the communication terminal device is a facsimile device, when the facsimile device detects a calling signal from the exchange, the telephone line is closed again to form a direct current loop with the exchange. On the other hand, when the communication terminal device is a telephone, the telephone is sounded by a call signal from the exchange. When the user off-hooks the handset of the telephone based on this ringing, the telephone line is closed and a DC loop is formed with the exchange. When the exchange detects the formation of this DC loop as a secondary response signal, the polarity of the telephone line which was previously reversed is depolarized by the exchange, and then the facsimile is sent between the sender and the receiver side communication terminal device. Communication or call is performed.

As described above, in this caller number notification service, the callee device is called by the ID receiving terminal activation signal before calling the callee device by a general call signal to notify the callee device of the caller's telephone number. I have to. Therefore, the receiving side device can not only recognize the telephone number of the caller and display it on the display unit before starting communication with the caller, but the caller wants to reject the communication. In the case of the other party, it is possible to respond such that the call is not answered by a general call signal from the exchange.

[0006]

By the way, in order to receive the above-mentioned calling number notification service, it is not only necessary to prepare a communication terminal device having a function for receiving the notification service, but also the communication terminal. It is necessary to set the function of the device so that it operates according to the incoming call procedure corresponding to the notification service instead of the normal incoming call procedure, and it is necessary to switch the contract of the general subscriber line to the contract for the notification service subscription. In this case, in the exchange, for subscribers who have subscribed to the notification service, the settings are switched so that they operate according to the incoming call procedure corresponding to the notification service. The switching timing on the exchange side and the communication terminal device side If the timing of function setting in step 1 is off, the following problem will occur.

That is, for example, although the function setting has already been made for the notification service on the communication terminal side, the switching source side has not yet switched for the notification service, the call is issued by the sender. When a call is made, the exchange sends a general ringing signal to the communication terminal device on the called side. On the other hand, since the receiving side device waits for an ID receiving terminal activation signal having a transmission pattern different from that of a general calling signal, it may not be able to recognize the calling signal from the exchange and may not close the line. There is. Further, even if the receiving side device recognizes a general call signal from the exchange as the ID reception terminal activation signal and closes the line, the exchange does not send the source telephone number data.
The receiving device considers that the receiving procedure is not normal and interrupts the communication.

On the contrary to the above, although the exchange side has already switched to the notification service,
When a call is made at the source while the function setting for the notification service is not yet made on the communication terminal side, the exchange sends an ID reception terminal activation signal to the communication terminal device on the called side. On the other hand, since the receiving side device is waiting for a general call signal having a transmission pattern different from that of the ID reception terminal activation signal, it cannot recognize the ID reception terminal activation signal from the exchange, and as described above. The line may not be closed. Even if the receiving side device recognizes the ID reception terminal activation signal from the exchange as a general call signal and closes the line, it cannot recognize the source telephone number data transmitted from the exchange. Therefore, also in this case, the communication is interrupted in the same manner as described above. Further, if the receiving side device is a telephone, the telephone will ring by the ID reception terminal activation signal from the exchange. However, even if the user off-hooks the handset based on the ringing, a call cannot be made because the line with the caller is not established.

The present invention has been made to solve the above problems, and an object of the invention is to reliably receive the notification service without paying attention to the timing of starting the calling party number notification service on the exchange side. Another object of the present invention is to provide a communication terminal device that is capable of operating and does not hinder the communication operation.

[0010]

In order to achieve the above object, in the invention of claim 1, in a communication terminal device having a function of receiving a service of notifying a caller side of a calling party number from a switchboard, a switchboard is provided. Detecting means for detecting the outgoing pattern of the ringing signal transmitted from the device, and based on the detected outgoing pattern, it is judged whether or not the incoming call operation corresponding to the notification service is performed, and the incoming call operation thereafter is controlled. And a control means.

According to the invention of claim 2, in claim 1,
The control means determines whether the calling signal from the exchange is an ID receiving terminal activation signal for the notification service or a general calling signal for calling the called side based on the detected calling pattern. , If it is an ID receiving terminal activation signal, the incoming call operation corresponding to the notification service is performed,
In the case of a general call signal, the normal incoming operation is performed.

According to a third aspect of the present invention, in the first or second aspect, the detecting means detects the transmission pattern by measuring the on time during which the ringing signal is transmitted and the off time during which the ringing signal is stopped. The control means at least 2 means that the on-time and off-time of the ringing signal measured by the detecting means are within predetermined time ranges.
When the signals are successively confirmed, it is determined that the signal is a normal ringing signal, and the incoming operation is started.

Therefore, the inventions of claims 1 to 3 have the following effects. According to the first aspect of the present invention, when the call signal is transmitted from the exchange based on the call from the caller, the detecting means detects the call pattern of the call signal.
Then, based on the detected calling pattern, the control means determines whether or not to perform the incoming call operation corresponding to the notification service, and controls the incoming call operation thereafter. For this reason,
Appropriate incoming operation is automatically performed according to the type of call signal from the exchange, and the notification service can be reliably received without considering the timing of starting the notification service on the exchange side.

According to the second aspect of the invention, the control means determines the type of the calling signal from the exchange based on the calling pattern detected by the detecting means, and when the calling signal is an ID receiving terminal activation signal. Causes an incoming call operation corresponding to the notification service, and in the case of a general call signal, causes an ordinary incoming call operation. Therefore, the incoming call operation or the normal incoming call operation corresponding to the notification service is appropriately performed according to the type of the call signal from the exchange.

According to the third aspect of the invention, when the ringing signal is disturbed by noise or the like, the on / off time measured by the detecting means is the on / off time of the ringing signal actually transmitted from the exchange. Different from the off time, the judgment operation based on the calling pattern of the calling signal may be erroneous. However, if the ON / OFF time of the ringing signal is detected at least twice in succession within the predetermined time range, then the signal is regarded as a normal ringing signal not affected by noise or the like. be able to. Therefore, based on the normal calling pattern of the calling signal, it is accurately determined whether or not to perform the incoming operation corresponding to the notification service,
The call is transferred to an appropriate incoming call operation.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in a facsimile machine will be described below with reference to the drawings.
As shown in FIG. 1, the facsimile apparatus 1 carries out a telephone call between a facsimile apparatus main body 2 that performs a facsimile communication operation, an NCU (network control unit) 3 that controls the connection with a telephone line 5, and a communication partner. And an attached telephone 4 for This facsimile machine 1
Has a function for receiving a caller number notification service. Further, a slave telephone 6 is connected to the facsimile device 1 via a cable (not shown), and the slave telephone 6 can also make a call with a communication partner.

Here, first, the facsimile apparatus main body 2
Will be described. A CPU (Central Processing Unit) 7 controls the operation of the entire facsimile device 1. A ROM (Read Only Memory) 8 stores various programs necessary for the CPU 7 to perform control. A RAM (random access memory) 9 temporarily stores various information such as data necessary for the arithmetic processing of the CPU 7. In the present embodiment, the CPU 7, the ROM 8 and the RAM 9 constitute a control means.

The modem 10 modulates and demodulates transmission / reception data, and also demodulates transmission source telephone number data as an FSK (frequency modulation) signal transmitted from the exchange. The reading unit 11 is for reading an image on a document, and the recording unit 12 is for printing on recording paper based on received image data and the like. Key operation part 13
Has various operation keys such as a numeric keypad for inputting a telephone number and the like. The display unit 14 displays various information such as the input telephone number and the caller telephone number notified from the exchange.

The on-detection timer 15 and the off-detection timer 16 as detecting means are transmitted 16 over the telephone line 5.
It is for measuring the on time and off time of a call signal of Hz (including a general call signal and an ID receiving terminal activation signal), respectively. When the call signal of 16 Hz is the ID reception terminal activation signal, the first counter 17 counts one cycle of the activation signal as one time. When the call signal of 16 Hz is a general call signal, the second counter 18 counts one cycle of the call signal as one time. Here, as shown in FIGS. 5A and 5B, one cycle is from the rising edge of each signal to the rising edge of the next signal.

Next, the structure of the NCU 3 will be described. The modem 10 is connected to the telephone line 5 via the transformer 22. The CML relay 23 is arranged between the telephone line 5 and the modem 10, and closes and opens the telephone line 5 under the control of the CPU 7. The telephone line 5 forms a DC loop through the modem 10 when it is closed, and opens the DC loop when it is opened. The polarity reversal detection circuit 24 detects the reversal of the polarity of the current flowing on the telephone line 5, and outputs the detection result to the CPU 7.

The calling signal detection circuit 25 is connected to the telephone line 5 and detects a 16 Hz calling signal (including a general calling signal and an ID receiving terminal activation signal) on the telephone line 5. The first and second off-hook detection circuits 26 and 27 are
The off-hook (a state where the handset is picked up) of the auxiliary telephone 4 and the slave telephone 6 is detected, respectively. The DC power supply circuit 28 supplies a predetermined current to each of the telephones 4 and 6 in order to detect the off-hook of each of the telephones 4 and 6. That is,
When the telephones 4 and 6 are off-hook, changes in the current supplied from the exchange or the DC power supply circuit 28 to the telephones 4 and 6 are detected by the off-hook detection circuits 26 and 27. Then, based on the detection of the current change by the off-hook detection circuits 26 and 27, the CPU 7 recognizes the off-hook of each of the telephones 4 and 6. The DC power supply circuit 28 also has a function of generating a pseudo call signal of 16 Hz, which is a signal similar to a general call signal, to ring each of the telephones 4 and 6 to notify the user of the incoming call. .

The first relay 29 and the second relay 30 are provided to selectively connect the telephones 4 and 6 to the telephone line 5 side and the DC power supply circuit 28 side. And
When the relays 29 and 30 are switched to the contact a side by the control of the CPU 7, the telephones 4 and 6 are connected to the telephone line 5 respectively.
When the relays 29 and 30 are switched to the contact b side, the telephones 4 and 6 are connected to the DC power supply circuit 28 side.

Next, the operation of the facsimile apparatus 1 configured as described above will be described. By the way, when the facsimile apparatus 1 receives an incoming call, under the control of the CPU 7, FIG.
And the operation as shown in the flowchart of FIG. 3 is performed. When the facsimile apparatus 1 is in a communication standby state, as shown in FIG. 1, the first and second relays 29 and 30 are switched to the contact a side, and the CML relay 23 opens the telephone line 5. As shown in FIG. 2, first, both the first counter 17 and the second counter 18 are “0”.
Is initially set (step S1), and in this state, it is waited for the on-state of the call signal of 16 Hz to be detected on the telephone line 5 (step S2). If the same state continues for 10 seconds or more, that is, if the ON state is not detected for 10 seconds or more (step S3), the process returns to step S1 and the first and second counters 17 and 18 are again set to "0".
Initially set to

In such an incoming call waiting state, a call signal of 16 Hz is transmitted from the exchange through the telephone line 5 based on a call made by the caller, and the call signal detection circuit 25 detects that the 16 Hz signal is on. ON detection timer 1
5 is actuated to start measuring the on-time (step S4). In this state, it is waited for the OFF of the 16 Hz signal to be detected (step S5). Here, if the ON state continues for 10 seconds or more (step S6), it is determined that the detected 16 Hz signal is not a normal signal, and the process returns to step S1.

At the same time that the 16 Hz signal is detected to be ON in step S2, the first and second relays 29 and 30 are switched from the contact a side to the contact b side.
As a result, the telephones 4 and 6 are disconnected from the telephone line 5 and connected to the DC power supply circuit 28 side. Therefore, each telephone 4, 6 is prevented from ringing by the 16 Hz signal.

In step S5, when the off of the 16 Hz signal is detected within 10 seconds, the off detection timer 1
6 is activated to start the measurement of the off time (step S7), and 1 measured by the on detection timer 15
It is determined whether or not the ON time of the 6 Hz signal is 0.3 seconds or more and less than 0.8 seconds (step S8). Here, if the determination result is NO, it is determined whether or not the measured on-time is 0.8 seconds or more and less than 2 seconds (step S9). If the determination result is NO, too. Then, it is determined that the detected 16 Hz signal is not a normal signal, and the process returns to step S1.

On the other hand, if the decision result in the step S8 or S9 is YES, it is awaited that the ON of the 16 Hz signal is detected (step S10). Here, if the off state continues for 10 seconds or more (step S11), it is determined that the previously detected 16 Hz signal is not a normal signal, and the process returns to step S1. Also, within 10 seconds, 16H
When the z signal is detected to be on, the on detection timer 15 is activated to start measuring the on time (step S1).
2).

Subsequently, as shown in FIG. 3, the off time of this time measured by the off detection timer 16 is 0.3 seconds or more and less than 0.8 seconds, and moreover, it is detected immediately before the off of this time. It is determined whether the ON time of the 16 Hz signal is 0.3 seconds or more and less than 0.8 seconds (step S1).
3). If the determination result is YES, it is determined that the previously detected 16 Hz signal is one cycle of the ID receiving terminal activation signal for the sender number notification service,
The first counter 17 is incremented by "1" (step S1)
4). That is, the ID reception terminal activation signal is intermittently transmitted every 0.5 seconds with an off time of 0.5 seconds 16H
z signal. Therefore, the detected on-time of the 16 Hz signal is 0.3 seconds or more and less than 0.8 seconds, and the off-time until the 16 Hz signal is turned on next is 0.3 seconds or more and If it is less than 0.8 seconds, it is determined that the signal corresponds to one cycle of the ID receiving terminal activation signal.

Then, it is judged whether or not the count value of the first counter 17 has become "2" (step S1).
5). Here, if the value is not "2", the process returns to step S5 in FIG. 2 and the ON time and the OFF time of the 16 Hz signal are measured again. Further, when the count value of the first counter 17 becomes “2”, in other words, when the ID reception terminal activation signal is continuously detected for two cycles, the activation signal is normally received. It is determined that the call is received, and an incoming procedure corresponding to the caller number notification service as shown in FIG. 4 is executed (step S1).
6).

That is, the CPU 7 of the facsimile apparatus 1
When it is determined that the 16 Hz signal from the exchange is the ID reception terminal activation signal, the CML relay 23 closes the telephone line 5 to form a direct current loop with the exchange through the modem 10. When the formation of this DC loop is detected by the exchange as a primary response signal, the data of the source telephone number is transmitted from the exchange to the facsimile machine 1 as an FSK signal. Telephone number data from the exchange is modem 10
The modem 10 demodulates the received data. Then, the CPU 7 recognizes the telephone number of the sender based on the data demodulated by the modem 10, and displays the telephone number of the sender on the display unit 14, for example.

Further, when the CPU 7 receives the telephone number data from the exchange, the CML relay 23 causes the telephone line 5 to operate.
Is opened once to open the DC loop with the exchange. When the exchange detects the opening of the DC loop as a reception completion signal, the exchange transmits a general call signal (a 16 Hz signal having an on time of 1 second and an off time of 2 seconds) to the facsimile apparatus 1. When the CPU 7 detects the calling signal via the calling signal detection circuit 25, the CM
The telephone line 5 is closed again by the L relay 23 to form a DC loop. When the formation of this DC loop is detected by the exchange as a secondary response signal, the polarity of the telephone line 5 is depolarized by the exchange, and then communication is started between the sender and the facsimile machine 1 on the called side. .

During this communication, the CPU of the facsimile machine 1
When detecting the CNG signal from the transmission source via the modem 10, 7 determines that the transmission source is a facsimile machine and executes the facsimile communication procedure. Also, CPU7
If the CNG signal is not detected, it is determined that the calling side is a telephone and the DC power supply circuit 28 outputs 16H.
A pseudo call signal of z is generated to ring each of the telephones 4 and 6. Based on this ringing, the user selects one of the telephones 4, 6
Off-hook the handset of the
The second relays 29 and 30 are switched from the contact b side to the contact a side, and the CML relay 23 is turned off to open the DC loop via the modem 10. As a result, each of the telephones 4 and 6 is connected to the telephone line 5 side, and the user can use the telephones 4 and 6 off-hook to talk with the caller.

On the other hand, when the result of the determination in step S13 of FIG. 3 is NO, the current off time measured by the off detection timer 16 is 0.8 seconds or more and less than 3 seconds, and It is determined whether or not the on-time of the 16 Hz signal detected immediately before turning off is 0.8 seconds or more and less than 2 seconds (step S17). Here, if the determination result is NO, it is determined that the previously detected 16 Hz signal is not a normal signal, and the process returns to step S1 in FIG. If the determination result is YES, the previously detected 16 Hz signal is determined to be one cycle of a general ringing signal, and the second counter 18 is incremented by "1" (step S18). . In other words, a general ringing signal is 16 Hz, which is intermittently transmitted every 1 second with an off time of 2 seconds.
Signal. Therefore, the detected on-time of the 16 Hz signal is 0.8 seconds or more and less than 2 seconds, and 1
The off time until the 6 Hz signal turns on next is 0.
If it is 8 seconds or more and less than 3 seconds, it is determined that the signal is one cycle of a general ringing signal.

Then, it is judged whether or not the count value of the second counter 18 becomes "2" (step S1).
9). Here, if the value is not "2", the process returns to step S5 in FIG. 2 and the ON time and the OFF time of the 16 Hz signal are measured again. Further, when the count value of the second counter 18 becomes "2", in other words, when a general calling signal is continuously detected for two cycles, the calling signal is normally received. It is determined that the received call is the one that is received, and the normal incoming procedure is executed (step S2
0).

That is, the CPU 7 of the facsimile apparatus 1
When it is determined that the 16 Hz signal from the exchange is a general call signal, the CML relay 23 closes the telephone line 5 and then starts communication with the caller. The operation at the time of this communication is similar to the above-mentioned case, and when the CNG signal from the transmission source is detected, the facsimile communication procedure is executed with the transmission source. Further, when the CNG signal is not detected, the telephones 4 and 6 are sounded by the pseudo call signal. Therefore, the telephones 4 and 6 are off-hooked based on the sounding, and thus it becomes possible to talk with the caller. Become.

Since the facsimile apparatus 1 of this embodiment operates as described above, it has the following excellent effects. (1) When a call signal of 16 Hz is transmitted from the exchange based on a call from the caller, the call signal's call pattern is detected by measuring the on time and off time of the call signal. Then, based on the detected outgoing call pattern (that is, on / off time), it is determined whether or not to perform the incoming call operation corresponding to the caller number notification service,
Subsequent incoming call operations are controlled. More specifically, it is determined whether the 16 Hz signal from the exchange is the ID receiving terminal activation signal for the notification service or the general calling signal for calling the called side based on the detected calling pattern. . Then, if the signal is an ID receiving terminal activation signal, the incoming procedure corresponding to the notification service as shown in FIG. 4 is executed, and if it is a general calling signal, the normal incoming procedure is executed.

Therefore, an appropriate incoming call operation is automatically performed according to the type of the calling signal from the exchange, and the subsequent communication operation is not hindered. Therefore, the user only has to switch the contract for the general subscriber line to the contract for the notification service subscription, and after that, if the switching is performed for the calling party number notification service on the exchange side, the notification service can be secured after that. Can be received. As a result, it becomes possible to reliably receive the notification service without paying attention to the timing of starting the calling party number notification service on the exchange side.

(2) When the detected on / off time of the ringing signal falls within a predetermined time range, the signal is one cycle of the ID receiving terminal activation signal or general ringing signal. When it is determined that there is one, the first or second counter 17, 18 is incremented by "1". When the count value becomes "2", in other words, when the ID reception terminal activation signal or the general call signal is continuously detected for two cycles, the call signal is normally received. It is determined that the call has been received, and the incoming procedure thereafter is executed.

That is, when the ringing signal from the exchange is disturbed by noise or the like, the on / off time measured by the timers 15 and 16 is the on / off time of the ringing signal actually transmitted from the exchange. Unlike the above, there is a possibility that an error may occur in the judgment operation based on the calling pattern of the calling signal. However, if the count value of the counters 17 and 18 becomes “2”, that is, if the on / off time of the ringing signal is detected within the predetermined time range at least twice in a row, then the signal concerned is set. It can be regarded as a normal ringing signal that is not affected by noise or the like. Therefore, based on the transmission pattern of the normal ringing signal,
It is possible to accurately determine whether or not to perform the incoming call operation corresponding to the notification service, and shift to an appropriate incoming call operation.

The present invention may be modified and embodied as follows, for example. (1) The communication terminal device of the present invention should be embodied by a simple telephone instead of a facsimile device.

(2) In steps S15 and S19 of FIG. 3, when the count value becomes "2", the procedure shifts to the incoming call procedure, but this count value is, for example, "3".
Or change it to a value larger than "2", such as "4". In this case, it can be more reliably determined that the calling signal has been normally received.

(3) The range of ON / OFF time, which is a reference for determining whether the calling signal from the exchange is the ID receiving terminal activation signal or a general calling signal, is determined from the range of the above embodiment. Change to a narrow range.

[0043]

As described above in detail, the present invention has the following excellent effects. According to the invention of claim 1, an appropriate incoming call operation is automatically performed according to the type of the calling signal from the exchange. Therefore, the switching side can receive the notification service without being aware of the timing of starting the calling number notification service, and the communication operation is not hindered.

According to the second aspect of the present invention, the incoming call operation or the normal incoming call operation corresponding to the notification service is properly performed according to the type of the calling signal from the exchange. According to the third aspect of the present invention, it is possible to accurately determine whether or not the incoming call operation corresponding to the notification service is performed based on the normal call signal transmission pattern, and shift to an appropriate incoming call operation.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of a facsimile apparatus embodying the present invention.

FIG. 2 is a flowchart showing an operation of the facsimile apparatus when receiving an incoming call.

FIG. 3 is a flowchart showing an operation of the facsimile apparatus when receiving an incoming call.

FIG. 4 is an explanatory diagram showing an incoming call procedure in a calling number notification service.

5A is an explanatory diagram showing a transmission pattern of an ID receiving terminal activation signal, and FIG. 5B is an explanatory diagram showing a general transmission pattern of a calling signal.

[Explanation of symbols]

1 ... Facsimile device, 2 ... Facsimile device main body, 7
... CPU constituting control means, 8 ... ROM constituting control means, 9 ... RAM constituting control means, 10 ... Modem, 15 ... On detection timer as detection means, 16 ... Off detection timer as detection means, 17 ... the first counter,
18 ... Second counter.

Claims (3)

[Claims] 1. A communication terminal device having a function for receiving a service of notifying a caller of a calling party number from a switching device, and detecting means for detecting a calling pattern of a calling signal transmitted from the switching device. A communication terminal device, comprising: a control unit that determines whether to perform an incoming operation corresponding to the notification service based on an outgoing pattern and controls a subsequent incoming operation. 2. The control means, based on the detected calling pattern, uses a calling signal from the exchange as an ID receiving terminal activation signal for a notification service or a general calling signal for calling the called side. The method according to claim 1, wherein it is determined whether there is an ID reception terminal activation signal, and if it is an ID reception terminal activation signal, an incoming operation corresponding to the notification service is performed, and if it is a general ringing signal, an ordinary incoming operation is performed. Communication terminal equipment. 3. The detection means detects a transmission pattern by measuring an on-time during which a ringing signal is transmitted and an off-time during which the calling signal is stopped, and the control means is measured by the detection means. When it is confirmed at least twice in succession that the on time and off time of the ringing signal are within the predetermined time range, it is determined that the signal is a normal ringing signal, and the incoming operation is performed. The communication terminal device according to claim 1.