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METHODS AND APPARATUS FOR MAINTAINING CONNECTIVITY WITH AN INTERNET PROTOCOL PHONE OPERATING BEHIND A FIREWALL

  • US 20100098061A1
  • Filed: 12/24/2009
  • Published: 04/22/2010
  • Est. Priority Date: 06/25/2003
  • Status: Active Grant
First Claim
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1. A method for a switch to maintain connection with an Internet protocol (IP) phone operating behind a firewall, the method comprising:

  • registering the IP phone in response to receiving a first registration request from the IP phone, the first registration request including first registration information, the first registration information including a first public IP address associated with the firewall;

    storing the first registration information;

    reregistering the IP phone in response to receiving a second registration request from the IP phone, the second registration request including second registration information, the second registration information including a second public IP address associated with the firewall, the second public IP address different from the first public IP address; and

    reverting to the stored first registration information to process calls associated with the IP phone.

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