SU1589422A1 - Device for limiting calls - Google Patents

Abstract

This invention relates to telephone set-top boxes that restrict call progress. The purpose of the invention is to provide selective call restriction. Call restriction is achieved by programming the access codes in unit 1 for coding access signals. Access is made by the caller dialing the reference number received by call receiving unit 2, which simulates a response and generates a signal to signaling and releasing unit 3, where an access code dialing permission signal received by code receiver 4 and displayed in display unit 5 is generated. 1 il.

Description

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The NU Invention relates to telephony can be used as an assignment to a telephone set providing access to the incoming communication by dialing a special access code after dialing the reference number. The aim of the invention is to provide selective call restriction.

The drawing shows the structure-wiring diagram of the device for restricting calls.

The device comprises a block 1 for coding access signals, a block 2 15 for receiving a call, a block 3 for signaling and releasing a subscriber, a receiver 4 for codes, a block 5 for indication and a telephone set 6.

The device for limiting the call-20 BOB works as follows.

To allow incoming calls, subscribers of the set-top box must program the appropriate number of access codes using 25 KHonojK block 1. At the same time, the device will be able to receive calls from subscribers dialing the number of the allocated access code after the reference number. When dialing the reference number-JQ pa subscriber line enters the signal inductor call. This signal is received by block 2, which, having received the first burst, simulates the answer to a call by creating a closed loop at 35 dc, and also generates a signal to block 3, where a short-term tone burst is produced, which is transmitted to the calling subscriber for. invitations to the dialing code 40 access. The caller dials, for example, code 18. If this code is set, after receiving and fixing two series of pulses in receiver 4 and block 5, this code in binary form 45 from receiver 4 goes to block 1. In the latter, the code is compared with the set -. nym. From the receiver. 4. A signal is received that permits the control of the Calling sprinkle block 3 signal to the calling subscriber line. This signal is received by the caller as a familiar station signal, the Control — making the call. In block 3, this signal is reproduced after amplification as an acoustic call signal, for example, using a special loudspeaker. Subscribers, having received an acoustic signal and a highlighted code,

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it is easy to identify who should approach the telephone and who gets the call. After picking up the handset from the telephone 6, the device returns to its original state, since from block 3 to block 2, the receiver 4 and block 5 send a command through receiver 4, returning them to the initial state: in block 2 the loop for direct current is broken, in receiver 4 the information about code 18 is erased, which eliminates its tracing in block 5. If callers do not dial an access code, after a temporary call, for example, in 6 seconds in block 3 a command is formed to bring the console to its original state. The caller will receive a Zanto signal from his / her subscriber set. Since this signal will come after a short-term tone, the busy signal will be recognized by the caller as an incoming call restriction signal, and not as a called subscriber line busy signal.

It may happen that the called party doesn’t answer the phone during the time of receiving the four incoming calls. In this case, in block 3, a signal is generated to reset the device to its initial state. Such cases will occur rarely. This can happen when the users forget to disable the access code in block 1, with a long absence

If in block 1 none of the access codes is programmed, then in the device the full barring on incoming communication is set. This mode of coins can also be set by pressing a special button, which is part of block 3 and is displayed on the front panel of the device. In this case, after receiving the first call, a short-term tone packet from block 3 is transmitted. Since the incoming call is prohibited, after a time delay in block 3, a command is formed to bring the set-top box back to its original state. The caller. After a short-term tone, after a temporary call, receives a Zan-Tone signal from its subscriber set and decrypts the latter as a prohibition of incoming communication to the called subscriber.

In cases of busy lines with a prefix, callers will receive a Sent signal immediately after dialing the reference number, as in usual cases, and the elements of the device are not included in the work.

If code 00 is programmed, then the constraints on the inbound link are removed. In this case, the short-term tone parcel is not transmitted to callers, and after dialing the reference number in block 3, the sending control signal is immediately generated for transmission to the calling subscriber, and the calling signal is transmitted to the caller in the manner described above. In this case, the prefix ensures that the caller is detected The call will always display code 00.

When talking, when the handset is removed from the device, the prefix is in its original state. The release after release is carried out in the usual way.

Claims (1)

Invention Formula A device for restricting a call BOB, containing a call receiving unit, the first and second outputs of which are connected to the first and second inputs the subscriber’s alarm and release unit, and a code receiver and a display unit connected in series, the first input of the call receiving unit being combined with the line input of the telephone set, the input of which is connected to the third input of the alarm and release unit Q subscriber, the first output of which is connected to the combined first input of the receiver code and the second input of the call receiving unit, the third output of which is connected to the second input of the receiver 5 code, and the second output of the signaling and releasing unit is connected to the first input of the call receiving unit, characterized in that, in order to provide a selective restriction of calls, an access signal coding unit is inserted, the first and second outputs of which are connected to the fourth and fifth, respectively the inputs of the signaling unit and the release of the subscriber, the sixth input of which is connected to the fourth output of the call receiving unit, the fifth output of which is connected to the first input of the coding block of access signals, the third and 0 whose fourth inputs are connected. I correspond to the second and third outputs of the receiver code.