SU1354439A2 - Apparatus for automatic readdressing of calls - Google Patents

Abstract

The invention can be used as a prefix to a telephone set (TA) PBX for forwarding calls, respectively, to the number programmed by the departing subscriber or to a number from 4 remotely by calling your own TA from any TA, and remotely changing the previously programmed number to a new number for forwarding The purpose of the invention is the elimination of call losses during call forwarding. The device contains a receiver (П) of call 1, switching contacts 2, 3, 15, wires 4,. 5 lines of communication, tr-p 6, P 7 tones, automatic. dialer 8, russ 9 redirection signals, R 10 control signals, block 11, rn 12 control signals, switching unit 13, opening contacts 14, normalizer 16 signals, start block 17, switching block 18, control block 19 , P 20 code change numbers, P 21 series of numbers. 1 il. (L 00 el 4 4 SLE

Description

The invention can be used with the - as an extension to the usual PBX telephone system for forwarding calls according to the number programmed by the departing subscriber or the number changed by the subscriber remotely by calling his own telephone from any device and remotely changing it before the programmed number for the new number for redirection is an improvement of the known device according to the author. St. No. 1210231.

The purpose of the invention is the elimination of call losses during call forwarding.

The drawing shows an electrical block diagram of the device for automatic call forwarding.

The device contains a receiver 1 call, the first 2 and second 3 switch 30

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contacts, first 4 and second 5 wires of the communication line, transformer 6, 25 receiver 7 tones, automatic dialer 8, generator 9 of redirection signals, receiver 10 of control signals, block, 11 occupied, generator 12 of control signals , the switching unit 13, the opening contact 14, the third switching contact 15, the normalizer 16 signals, the startup unit 17, the switching unit 18, the control unit 19, the number change code receiver 20, the serial number receiver 21.

The device for automatic call forwarding works as follows. I

Suppose that because of the changed situation, the subscriber needed to change the number, scheduled to redirect calls before leaving in the automatic dialer 8. To do this, he dials his own number from any telephone set. In this case, in accordance with the algorithm of operation of the known device, after the second step of sending the inductor call signal, at the output of the call receiver 1, a command is generated, according to which the unit 11 takes the transformer 6 connected to the line. The inductor call signal is also sent to the signal normalizer 16, in which it is rectified and

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leads to the level required for matching with the elements of integrated circuits. From the signal normalizer 16, the converted call message is transmitted to the start-up unit 17, which thereby makes the device ready for remotely receiving information about the new number for forwarding. In addition, the potential that delays the operation of the control signal generator 12 by time 5 is transmitted from the output of the starting block 17 to the second input of the control signal generator 12. A delay in the operation of the control signal generator 12 at time C is required to receive a number change code. Signal is transmitted from the start-up unit 17 to the switch-over unit 18, which in the switch-off unit 18 is configured to generate information from the normalizer 16 to the receiver 20 of the number change code.

For a time not exceeding f, the subscriber dials the number change code, for example 3. The signal normalizer 16 brings the information about code 3 to the appropriate level and passes it through the switch 18 to the number change code receiver 20, where code 3 is deciphered by

which produces a signal to the switching unit 18, in which a path is formed for transmitting information about the new number to the redirection from the normalizer 16 signals to the receiver 21 series of the number. After dialing code 3, the subscriber dials a new number for forwarding, instead of being programmed by him before leaving in the automatic dialer 8. To avoid a device malfunctioning from the switching unit 18, the launch unit 17 transmits a command that the startup unit 17 generates a signal to the generator 12 of control signals to prohibit it to work when the subscriber dials a new number, for forwarding. After the serial number is serially decrypted by the receiver of the 21 series of the number, the new number is recorded for forwarding sequentially as the series is received in the automatic dialer 8. In this case, the previously recorded number is erased. Upon receipt of information about the series from the normalizer, 16 signals per block

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19, a command is transmitted by which the control unit 19 generates the Read and Reset signals transmitted to the receivers 20 and 21 to ensure the normal operation of the counters included in them and the Release signal to bring the device units back to their original state.

Consider the operation of the proposed device for automatic call forwarding in the mode of automatic call forwarding. At the same time, during the time C, the information on the number change code is not received from the communication line. After time C, the potential is removed, which delays the operation of the generator 12 of control signals. In addition, a signal is removed from the output of the starting block 17, which is fed to the signal normalizer 16, which prevents the undesirable effect of some information from the communication line on the entered blocks. The control signal generator 12 generates a short-term tone burst, for example, at a frequency of 4000 Hz. This short-term signal is received by the receiver 10 of the control signals, the outputs of which thereby form a command for switching on the generator 9 of the redirection signals and in the switching unit 13. The latter switches the incoming path from the communication line to the throttle to hold the connection for the duration of the redirect, and the line to the outgoing path. The redirection signal generator 9 generates an alternating current signal, for example, a frequency of 900 Hz, which is transmitted to the side of the caller through the incoming path, notifying the caller of the fact that the call is being redirected.

When the communication line is switched from the incoming path to the outgoing direct current circuit through the primary winding of the transformer 6, the PBX is occupied by the outgoing path to which the register is connected. From the register comes a response signal PBX. This signal. Through the communication line, block 11 and transformer 6 is received by the receiver 7 tones, which activates the automatic dialer 8. The latter, in turn, switches the break contact 14 and the third 15 change-over contact to the operating mode. The third switching contact 15 disconnects from the transformer line 6 to increase the line current by disconnecting the primary winding of the transformer 6, and the opening contact 14 is pulsed to dial a series of current pulses according to the number recorded before the subscriber or changed remotely as described. Disconnection from the communication line of the transformer 6 with the power of the third switching contact 15 is required in order to avoid the formation of one false currentless pulse, which the register could accept as a supplement to the first series

0 currentless pulses generated

after that, break contact 14.

After the termination of the dialing number, the automatic dialer 8 again connects the transformer 6 to the scientific research institute by resetting contacts 14 and 15 and switches on the generator 12 of control signals. The latter produces an alternating current signal, for example, a clock of 3800 Hz. This signal goes to the receiver 10 of the control signals, which turns off the generator 9 of the redirection signals and forms a command to the switching unit 13. The latter connects the outgoing path to the dross5

outgoing paths between each other. The redirection signal generator 9 stops the forwarding signals to the calling subscriber, who for the second time receives the Call Control signal, which comes along the outgoing path that is connected to the PBX on the line to which the call was redirected. In addition, the acoustic signals are monitored by the receiver 7 tones.

When the line is called, the number for forwarding may be represented by three outcomes: the called subscriber is absent and therefore does not answer, the called subscriber is busy with the new number and, finally, after the call, the call is disconnected. After a long non-reply, the caller will hang up, after the end of the last call, the subscribers also hang up. In this case, as in the case of subscriber busy, a new number is received from the PBX. This is received by the receiver 7 tones, which transmits a command to the unit 11 to occupy and the generator 12 of control signals. The latter sends to the line a short-term AC signal, for example, with a frequency of 3600 Hz. Block 11 disconnects the transformer 6 from the line, and the signal with a frequency of 3,600 Hz is fed to the receiver 10 of the control signals, which thereby forms a command to the switching unit 13. The latter transfers the outgoing and incoming paths to the initial position, and the entire device is brought to the state of being ready to forward calls or receive information about the new number for forwarding from the subscriber-consumer of the device about the new number to be redirected after dialing the number change code.

Claims (1)

Invention Formula Device for automatic call forwarding by aut. St. No. 1210231, characterized in that, in order to eliminate call losses during call forwarding, a signal normalizer, a start block, a switch block, a control block, A. Levitsk Composer, Editor M. Blanard Tehred I. Popovich, Corrector I. Musk are introduced d, „,,„ .- „-. ..- t-1-t. -. - - ----- - - Order 5716/56 Circulation 636 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 the receiver of the measurement code, the receiver of the serial number, the output of which is connected to the input of the automatic dialer, and the first input of the receiver of the series of number is connected to the first output of the switching unit, the second output of which is connected to the first input of the receiver of the change code the number, the output of which is connected to the first input of the switching unit, the second input of which is connected to the first output of the signal normalizer and the input of the control unit, the first and The second outputs of which are connected respectively to the second and third inputs of the receiver of the number change code and the receiver of the series of numbers, the second output of the switching unit is connected to the first input of the start-up unit, the second input of which is connected to the second output of the signal normalizer,. the first input of which is connected to the first output of the launch unit, the second the output of which is connected to the third input of the switching unit, the third output of the control unit is connected to the third output of the startup unit and connected to the second input of the control signal generator, the first and second outputs of which are connected respectively to the third and fourth inputs of the signal normalizer.