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Phone-independent key expansion module

  • US 7,940,906 B2
  • Filed: 06/30/2006
  • Issued: 05/10/2011
  • Est. Priority Date: 07/20/2005
  • Status: Active Grant
First Claim
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1. A button box device configured to enable a user to invoke a call control function, comprising:

  • a key to which the call control function has been assigned;

    a display;

    a key press event module configured to send a key press event to a first switch; and

    a user interface module configured to receive user interface instructions from a second switch.

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