JPS60146563A - Limited incoming system - Google Patents

Abstract

PURPOSE:To reject an undesired call by sending out subscriber discriminating information (ID) stored in a calling side additional device, together with a call, comparing it with ID registered in advance, at an incoming side, and executing a response only when they coincide with each other. CONSTITUTION:When a calling side telephone set 1 is hooked off, an additional device ADP2 detects it, and a dial tone is sent to a calling side from a switchboard LS11. Subsequently, when dialing is executed, a ringing tone and a call signal are sent to the calling side and an incoming side, respectively, from the LS11. The incoming is detected 16 by an incoming side ADP14, a non-charging response 17 is executed, the ringing tone and the call signal are stopped once, and thereafter, the ringing tone is outputted from a circuit 15 again. ID information of a memory 3 is sent out 4 in the interval of the ringing tone. The ID is received 18 by the ADP14, compared 21 by ID registered in a memory 22, and when they coincide with each other, a call signal 24 is sent to a telephone set 26 by switching a contact 23. When the telephone set 26 is hooked off, the contact 23 is restored, the telephone set 1 and 26 are connected, charging is started, a call state is set, and an undesired call is rejected.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a limited incoming call system, and more specifically, a system that allows incoming calls only from parties that the receiving subscriber has preliminarily registered. It is related to.

[Prior art]

Nowadays, the telephone has become one of the most important means of communication in everyday life. In Japan, complete automation of the telephone network has been achieved and it is widely used by the general public, but the conventional telephone network service is a service that gives priority to the calling party, and the called party does not have much choice. can. That is,
Even if the called party receives a call, they cannot confirm who the other party is until they pick up the phone and begin the call, and even after the call has started, they cannot confirm the identity of the other party unless they identify themselves. However, there was a drawback that it was not possible to select the person to answer the incoming call. For this reason, these characteristics of telephone calls were often exploited and used as a means of intimidation and harassment.

To solve these problems, when a call is received, the calling subscriber identification information (hereinafter referred to as ID) such as the calling party's telephone number is required.
It would be good if the destination could know this.

To do this, it is necessary to transfer ID information from the calling side to the called side before starting a call, but existing telephone networks do not have such a function. Nowadays 1 As a new communication service in the future, communication networks will be digitized and telephone calls will become available.

Research is being conducted on a system that integrates fax, data communications, etc., and if this is realized, it will be possible to transfer more information, but it will require the construction of a new digital network that is completely different from the existing analog MT network. Therefore, it is expected that a large amount of cost and time will be required for its completion.

[Purpose of the invention]

The purpose of the present invention is to solve such conventional problems and to prevent threatening and harassing calls by allowing incoming calls only from parties desired by the incoming subscriber without making large-scale network modifications. The purpose is to provide a limited incoming call method that can prevent such problems.

[Summary of the invention]

In order to achieve the above object, in the limited call receiving method of the present invention,
a calling side additional device comprising a means for registering subscriber identification information such as a subscriber's name and telephone number, and a means for transferring the registered identification information to a called side, an incoming call detection means, a non-charging response means, A call receiving add-on device equipped with a means for receiving the above identification information, a means for registering subscriber identification information that allows incoming calls, and a means for comparing the information with the transferred subscriber identification information is installed in correspondence with the subscriber terminal of the exchange. When a call is received, and before the call starts, a call path is established between the calling side additional device of the calling side subscriber and the called side side additional device of the called side subscriber by making a non-charging response at the called side side additional device, The feature is that the identification information transferred from the originating side additional device is compared with the identification information registered in the terminating side pressure, and only when the two match, a paging signal is sent to the terminating side terminal.

FIG. 1 is a block diagram of a telephone switching network illustrating an embodiment of the present invention. A subscriber line switch (hereinafter referred to as LS) 110 corresponds to an originating subscriber terminal 10 and a terminating subscriber terminal 12, an originating side additional device (hereinafter referred to as originating ADP) 2 and a terminating side additional device (hereinafter referred to as terminating ADP). This figure shows the case where 14 were installed and implemented. In addition, in a solid telephone network, the calling party L
Although a trunk exchange may be inserted between S and the destination LS, the operation sequence etc. are generally the same, so here we will consider the case where the originating phone 1 and the destination phone 2 are accommodated in the same LS. Let me explain using an example.

The originating subscriber line 9 and the terminating subscriber line 13 in FIG. 1 are usually composed of two glands, and the DC' voltage conditions between the two glands during connection operation are as shown in FIG. 2. It has become.

In other words, in the normal state before a call is made, both the calling and receiving sides are
l is 10 earth ki, and L2 is 148V.

When the originating side jammer 1 is off-hook, a DC loop is created in the originating subscriber line 9, which is detected by the loop detection circuit 6 of the originating ADP 2, and from the LSII, the originating side is A dial tone is sent (see Figure 2~)
. The loop detection circuit 6 includes, for example, a light emitting diode 27.28 and a phototransistor 29.3 as shown in FIG.
It can be easily constructed by inserting the light emitting diodes 27°2δ of the photocouplers 31 and 32 in parallel with each other in opposite directions so that the current flows in both directions, and inserting them in series in the circuit. LDO indicates loop detection output. Next, when you dial the telephone number of the called party's telephone 26 using the same operations as with a normal telephone, the caller enters the ringing state, and the LSll sends a ring tone to the calling party and a ringing signal to the called party. , the polarity of the terminating subscriber line 13 is reversed, Ll becomes -48V and L2 becomes 148V (see Figure 2-(4)).

In addition, the diagram that connects Ll and L2 manual labor is the telephone receiver O.
The figures in which N-shaped MU, L-shaped and L2 are connected by solid lines respectively show the state where the handset is off.

-Calling A D P l 4-'s reputation detection times W+'= 16
When this reversal is detected, the non-charging response circuit 17 outputs L2-
By forming a unidirectional loop that allows current to flow only in the direction of Ll, a non-charging response is performed. Incoming call detection circuit 16
Reversal detection can be easily realized using, for example, a general-purpose comparator circuit, and also by detecting the call signal sent to the same poem (75V, 16H AC, repeatedly connected for 1 second and disconnected for 2 seconds). A detection method may also be used. The non-charging response circuit 17 is, for example, L2-LL as shown in FIG.
It can be easily constructed by using a diode 33 that allows current to flow in the direction of , a series resistor 34, and the like. Furthermore, by combining a light emitting diode that allows current to flow in the direction of L2→L1, a direct current resistor, a double-metal transistor, etc., it is possible to simultaneously realize both the functions of the incoming call detector 616 and the non-charging response circuit 17.

No-charge response is known to be implemented on the trunk of the incoming toll-free line of the existing telephone network! ], the detailed explanation is omitted here, but in this state, the DC voltage conditions of the subscriber line are the same as in Figure 2-α) to (3), and II
′! The sound output and ringing signal will be stopped, and the charge will be 111%.
A communication path is formed between the i-originating ADP 2 and the terminating ADP 14 before it even begins.

The above is an overview of the operation of the non-charging response.The actual operation is executed almost instantly, so the time it takes for the LSll to send a ring tone to the calling party and a ringing signal to the called party is very short. In practical terms (because it is close to the LSII phone), the calling phone 1 can hardly hear the ringing tone sent from the LSII card.Therefore, the calling subscriber feels a sense of discomfort compared to the case of a regular phone. In order to prevent this, please contact A D P 1
4, after the non-charging response, the ring tone sending circuit 15 originally outputs L.
Same ringtone as that sent from SII (400Hz 1
At 6H2, amplitude modulation (AM) L, which is repeated for 1 second on and 2 seconds off) is transmitted.

The ringing tone sent out from the ringing tone sending circuit 15 is
The ring tone receiver 8 of No. 2 receives
2 learns that a communication channel with *ADP 14 has been secretly set up through a non-chargeable response. The ringing receiver 8 has 4
Received by AM receiver with carrier wave 00H2 (u:,
l:d), then band 1 < filter l 6 l-l
This can be easily realized using the known technique of detecting the frequency 'ktM of ff1, and the output of a tone receiver that detects the frequency component of 400 Hz is 1 second.

It may be of a type that counts on and off times in a 2-second cycle.

Since the ring tone repeats 1 second on and 2 seconds off, when the ring tone receiver 8 detects a break in the ring tone (2 seconds off state), the ring tone is thereafter transferred from the optical ADP 2 to the destination ADP 14. In order to prevent the calling subscriber from hearing the signal tone, the calling ADP 2 drives the contact 6 downward to disconnect the calling telephone 1 and switch to the 1-p hold circuit 7. The loop holding circuit 7 is for holding the loop monitoring relay in the subscriber circuit of the LSll when the calling telephone 1 is disconnected, and in the simplest configuration, it flows the current necessary to hold the relay. This can be achieved with only a resistance commensurate with .

The ID1 information storage circuit 3 is a circuit in which ID information corresponding to the caller's phone number, name, etc. is registered and stored in advance, and is a general-purpose ROM (READONLY MEMOR) circuit.
It can be easily configured using Y) etc. The ID information may be any information that can be used to identify the calling subscriber, but in the following explanation, we will take as an example the case where the ID is a telephone number, which is considered to be the most common.

The originating subscriber identification signal (hereinafter referred to as ID signal) sending circuit is a circuit that converts the ID information stored in the information storage circuit 3 into a serial ID signal and sends it out. As described above, after the contact 6 is driven at the end of the ringing tone, the ID signal is sent from the signal sending circuit to the destination ADP 14. The specific ID signal is 300Hz-3
Any signal that can be transmitted within the 400H2 voice communication band is acceptable; for example, the signal used for PB double signal pushbutton dialing), F8K within the band (FREQ-U
ENCY 5HIFT KEYING) signals, etc.

When the sending signal DP2 has finished sending out the signal, the contact δ is restored and the calling telephone 1 is reconnected.

The time required to send one ID signal is, for example, 1 second, even if a 10-digit telephone number is sent as an FB signal, so the time that contact 5 is activated is the time between the end of the ringer ( 2 seconds), so the calling subscriber does not feel any discomfort compared to the normal ring tone. In this way, the originating ADP 2 repeats the operation of transmitting the ID signal every time the ring tone ends. It is transferred to the processor 21 as ID information.

The memory 22 stores ID information (telephone numbers) of parties to whom incoming calls are permitted, which have been registered in advance by the receiving subscriber. The processor 21 compares the ID information transferred from the signal receiver 18 with the ID information stored in the memory 22, and if the two match, the processor 21 determines that the call is from a party acceptable to the Sakesen subscriber. If not, the contact 23 is driven downward to send out a calling signal from the calling signal sending circuit 24, and the bell of the called telephone 26 rings. When the called subscriber responds by going off-hook, the subscriber response detection circuit 25
detects this and turns on the contact 23, that is, creates a two-way loop (the same loop as for normal incoming call response) in the subscriber line 13 on the destination side, and at the same time closes the ringing tone sending circuit lδ. Stop the operation.

When a loop is created in the destination subscriber line 13,
), (6) As shown in the IC, the polarity of the first subscriber line 9 is reversed, Ll becomes -48V, L2 becomes 100V, and billing starts, and at the same time, the originating telephone 1 and the terminating telephone telephone 2
It is now possible to talk to and from 6.

If the busy originating subscriber abandons (on-hook) before the terminating subscriber responds, the loop detection circuit 6 of the originating ADP 2
(detecting that the loop has been broken) stops the operation of the ID signal sending circuitry, which had been sending out an ID signal at a cycle of 3 seconds every time the ringer cut off. When the terminating ADP 14 detects that the signal receiver 18 no longer periodically receives the ID signal, it restores the contact 23 to stop the ringing of the terminating telephone 26, and sends a pre-call tI!
The operation of I@path 15 is also stopped.

If the ID information transferred from the ID signal receiver 18 and the ID information stored in the memory 22 do not match, it is assumed that the call has arrived from a party that is not permitted by the subscriber on the called side, and the busy tone sending circuit 20 is activated. Then, a busy tone is sent to the calling side telephone 1, and the bell of the called side telephone 26 does not ring. In addition, if the incoming call is not allowed, the busy tone may be given by voice guidance, etc., for example, "
It may also be possible to send a message such as "You cannot make a call to this subscriber."

The series of control operations described above can be easily realized by controlling the processor 21 by software.

In FIG. 1, only the originating ADP 2 is connected to the originating telephone 1, and only the terminating ADP 14 is connected to the terminating telephone 26, but in reality, every telephone has the originating ADP 2 and the terminating ADP 14 connected.
14 are connected, for example, the output ADP2
A series circuit of the destination ADP 14 and the destination ADP 14 are connected. and,
When the telephone becomes the originating party, the originating ADP 2 becomes effective, and when the telephone becomes the terminating party, the terminating ADP 14 becomes effective. In the series circuit of the originating ADP2 and the destination ADP14,
The processor 21 controls the ID signal sending circuit, the ringing tone sending circuit 15, the busy tone sending circuit 20, and the contacts 5 and 23. That is, the processor 21 of the destination ADP 14:
It also controls the circuit of the source ADP2. The loop detection circuit 6, the ringer receiver 8, the incoming call detection circuit 16, the ID signal receiver 18, the inversion detection circuit 19, and the subscriber response detection circuit 2
5 sends a signal to the processor 21, respectively.

Therefore, the only circuits unrelated to the processor 21 are the ID information storage circuit 3, the loop holding circuit 7, and the non-charging response circuit 17.

〔Effect of the invention〕

As explained above, according to the present invention, the existing telephone network
By installing an additional device in response to the subscriber terminal of the subscriber who desires the service, it becomes possible to accept calls only from the party desired by the subscriber on the called side, which has previously been done by giving priority to the calling party. early on for telephone services
Furthermore, it becomes possible to provide services that the receiving party has the right to choose from without having to make large-scale network modifications. Therefore, a significant effect is expected in preventing the telephone from being used as a means of intimidation and harassment as mentioned at the beginning. Further, by applying the present invention to, for example, a telephone set within a specific company, it becomes possible to construct a kind of closed communication network using the public telephone network.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a telephone switching network showing an embodiment of the present invention, Fig. 2 is a diagram showing the connection operation of a subscriber line exchange, Fig. 3 is a diagram of an embodiment of a loop detection circuit, and Fig. 4 is an It is an example figure of a billing response circuit. 1: Calling side telephone, 2: Calling side additional device (calling ADP), 3:
ID information storage circuit, 4: ID signal sending circuit, 5: contact a
16: Loop detection circuit, 7: Loop holding circuit, 8: Ringing receiver, 9: Originating subscriber line, 10: Originating subscriber terminal,
11: Subscriber line switch (LS), 12: Terminating side subscriber terminal, 13 Second terminating side subscriber line, 14 Second terminating side additional equipment (terminating ADP
), 15: Ringing tone sending circuit, 16: Incoming call detection circuit, 17
: non-charging response circuit, 18 : ID signal receiver, 19;
Reversal detection circuit, 20: Busy tone transmission circuit, 21: Processor, 22: Memory, 23: Contact point b% 24: Ringing signal transmission circuit, 25: Subscriber response detection circuit, 26 Two incoming telephones, 27: Light emitting diode, 28: light emitting diode,
29, 30: Phototransistor, 31.32 near-odd coupler, 33: Diode, 34: Resistor.

Claims (1)

[Claims] In front of the subscriber's /F5, a calling side additional device comprising means for registering subscriber identification information such as a telephone number, means for transferring the registered identification information to the called side, an incoming call detection means, and a non-charging response. A receiving side additional device, which is equipped with means for receiving the above-mentioned identification information, means for registering subscriber identification information that allows incoming calls, and comparing the information with the transferred subscriber identification information, is connected to the subscriber of the exchange. It is provided for terminals, and 1 is set before starting a call when an incoming call is received.
By responding without charge at the terminating side additional equipment, a communication path is established between the originating side additional equipment of the originating side subscriber and the terminating side additional equipment of the terminating side subscriber, and the identification transferred from the originating side additional equipment is established. A limited call reception method that compares the information with identification information registered on the called side, and only when the two match, sends a paging signal to the called side terminal.