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Apparatus and method for providing voice telephone instructions

  • US 6,748,060 B2
  • Filed: 04/08/2002
  • Issued: 06/08/2004
  • Est. Priority Date: 04/08/2002
  • Status: Expired due to Fees
First Claim
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1. A telephone handset that can be coupled to a telephone line that carries a series of ring signals, and a secondary phone device that has a line voltage detection circuit which detects a voltage drop within a predetermined time interval, comprising:

  • a line interface circuit that can be coupled to the telephone line; and

    , a controller coupled to said line interface circuit, said controller causes the generation of a tone signal on the telephone line and is activated if a subsequent activation tone is detected on the telephone line, said controller connects to the telephone line to detect the activation signal for a time interval less than the predetermined time interval of the line voltage detection circuit of the secondary phone device.

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