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Phone-independent key expansion module

  • US 8,553,875 B2
  • Filed: 05/13/2011
  • Issued: 10/08/2013
  • Est. Priority Date: 07/20/2005
  • Status: Active Grant
First Claim
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1. A system configured to enable a user to invoke a call control function using a button box device, comprising:

  • a switch configured to receive a key press event via a packet-switched network and to determine a call control function associated with the key press event; and

    a button box device configured to send the key press event via the packet-switched network.

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