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Method and apparatus for migrating to an alternate call controller

  • US 7,483,369 B2
  • Filed: 09/30/2003
  • Issued: 01/27/2009
  • Est. Priority Date: 09/30/2003
  • Status: Active Grant
First Claim
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1. A method for maintaining call state information, comprising:

  • generating in a first call controller first call state information;

    creating at least a first file containing a representation of at least some of said generated first call state information;

    providing said at least a first file to a first client;

    storing said at least a first file on said first client, wherein said first client is a communication endpoint participating in a call to which said first call state information pertains;

    establishing a call signaling channel between said first call controller and said first client;

    losing said call signaling channel;

    generating in said first client a request for service from a second call controller; and

    after losing said call signaling channel, providing said at least a first file from said first client to said second call controller.

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