Method for fetching the last dialed number of telephone set
A telephone, the last technology, applied in the direction of telephone communication, unauthorized/fraudulent telephone prevention, electrical components, etc., can solve the problems of affecting the speed of handling cases, affecting the handling of cases, difficult to keep secret, etc., to achieve the effect of rapid detection of the case.
Inactive Publication Date: 2007-07-25
天津滨海高新区五洲科技有限公司
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Problems solved by technology
[0002] In the past, when the public security organ retrieved the last dialed telephone number of the telephone used by the party concerned, for the telephone without a telephone number display, it could only be obtained through the telecommunications department, which not only affected the speed of handling the case, but also made it difficult to keep it secret; For the telephone with number display, dialing the "R" key can display the last dialed telephone number on the telephone, which sometimes attracts the attention of the parties and affects the handling of the case.
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[0008] See Fig. 1 and Fig. 2, can know a kind of specific structure of the present invention. It consists of a telephone set 1 used to extract the last dialed number of the party, a party online telephone set 2 connected in parallel with it, and a small telephone switchboard 3 connecting the telephone set 1 and the telephone set 2 with wires and alligator clips . The power supply of the small telephone exchange is 220V AC power supply.
[0009] Work flow of the present invention: telephone set 1 can select the telephone set of " TCL " HCD868 (37) TSDL or " TCL " HCD868 (37) TSD model for use. First, two series resistors R1 and R2 on the Q base of a crystal triode in the anti-theft calling circuit of a telephone set 1 are short-circuited, and one of the terminals is connected to the resistor R2 of the Q base of the transistor Q. The above modified telephone Telephone 1 is connected in parallel with a telephone 2 → the small telephone switch is connected to the power supply → ...
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The invention is used in handling cases by police department. The method comprises: in the first, for two series resistor on the base electrode of a crystal triode in the telephone's anti-embezzling circuit in a telephone set used for extracting the last dialing number of the party, one of them whose one end is connected to the base electrode is made with short circuit; the modified telephone set is connected to the telephone set of the party in parallel; a small telephone switch is connected to power supply; cutting off the external line of the telephone set of the party; redialing 'R' keystroke of telephone set of the party; the last dialing number on the telephone set of the party will transmitted to the modified telephone set for display through said telephone switch powered by the two telephone sets. By the invention police can fast extract the last dialing number without any attention paid by the party.
Description
technical field [0001] The invention relates to a telephone device, in particular to a method for extracting the last dialed number of a telephone set. It is mainly suitable for rapid investigation and case handling by public security departments. Background technique [0002] In the past, when the public security organ retrieved the last dialed telephone number of the telephone used by the party concerned, for the telephone without a telephone number display, it could only be obtained through the telecommunications department, which not only affected the speed of handling the case, but also made it difficult to keep it secret; For the telephone set with number display, dialing the "R" key can display the last dialed telephone number on the telephone set, which sometimes arouses the attention of the parties involved and affects the handling of the case. Now, look forward to the advent of its new extraction method. Contents of the invention [0003] The purpose of the pre...
Claims
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IPC IPC(8): H04M1/65H04M1/66H04M3/424H04M1/2745
Inventor 周振祥
Owner 天津滨海高新区五洲科技有限公司