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Cordless telephone base unit arranged for operating with multiple portable units

  • US 5,689,549 A
  • Filed: 12/01/1994
  • Issued: 11/18/1997
  • Est. Priority Date: 12/01/1994
  • Status: Expired due to Term
First Claim
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1. In a cordless telephone system employing a plurality of handset units and a base unit, an arrangement for establishing communications between the base unit and one of the plurality of handset units, the arrangement comprising:

  • means in both the base unit and each of the plurality of handset units for storing a common predetermined security code used in establishing each communication link between said base unit and one of the plurality of handset units over a communication channel;

    means in each one of the plurality of handset units responsive to the establishing of a communication link with said base unit for generating a substitute security code uniquely different from said predetermined security code, said substitute security code being substituted for said predetermined security code for use in subsequent communications with said base unit over said communication channel; and

    means for providing said substitute security code from one of the plurality of handset units to said base unit over an established communication link for use in said subsequent communications with said base unit during said established communication link, said base unit being unresponsive to communication attempts from other of the plurality of handset units unaccompanied by said substitute security code while communicating with a handset unit that provided said substitute security code.

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