Patents by Inventor Thomas A. Liebert

Thomas A. Liebert has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • System providing dynamic quality of service signaling messages in a cable telephony network
    Patent number: 8204223
    Abstract: A system of Quality of Service signaling in an IP cable telephony system includes encrypting Quality of Service signals and sending them, instead of directly from an Internet Protocol Digital Terminal to a Cable Modem Termination System, indirectly via Broadband Telephony Interface serving a telephony device. The Broadband Telephony Interface, which lacks the encryption and decryption keys, includes the encrypted Quality of Service signaling message in a signaling message it transmits to the Cable Modem Termination System when requesting a change in access to network resources. The Cable Modem Termination System attempts to decrypt the Quality of Service signaling message; and it controls access to network resources in accordance with the contents of the Quality of Service signaling message if it is able to decrypt it. This system reduces the number of signaling messages and network resources needed for call processing while providing security against denial-of-service attacks.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: June 19, 2012
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Thomas A. Liebert, Steven M. Michelson
  • System providing dynamic quality of service signaling messages in a cable telephony network
    Patent number: 7623664
    Abstract: A system of Quality of Service signaling in an IP cable telephony system includes encrypting Quality of Service signals and sending them, instead of directly from an Internet Protocol Digital Terminal to a Cable Modem Termination System, indirectly via Broadband Telephony Interface serving a telephony device. The Broadband Telephony Interface, which lacks the encryption and decryption keys, includes the encrypted Quality of Service signaling message in a signaling message it transits to the Cable Modem Termination System when requesting a change in access to network resources. The Cable Modem Termination System attempts to decrypt the Quality of Service signaling message; and it controls access to network resources in accordance with the contents of the Quality of Service signaling message if it is able to decrypt it. This system reduces the number of signaling messages and network resources needed for call processing while providing security against denial-of-service attacks.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: November 24, 2009
    Assignee: AT&T Corp
    Inventors: Thomas A. Liebert, Steven M. Michelson
  • System providing dynamic quality of service signaling messages in a cable telephony network
    Patent number: 7080248
    Abstract: A system of Quality of Service signaling in an IP cable telephony system includes encrypting Quality of Service signals and sending them, instead of directly from an Internet Protocol Digital Terminal to a Cable Modem Termination System, indirectly via Broadband Telephony Interface serving a telephony device. The Broadband Telephony Interface, which lacks the encryption and decryption keys, includes the encrypted Quality of Service signaling message in a signaling message it transmits to the Cable Modem Termination System when requesting a change in access to network resources. The Cable Modem Termination System attempts to decrypt the Quality of Service signaling message; and it controls access to network resources in accordance with the contents of the Quality of Service signaling message if it is able to decrypt it. This system reduces the number of signaling messages and network resources needed for call processing while providing security against denial-of-service attacks.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: July 18, 2006
    Assignee: AT&T Corp.
    Inventors: Thomas A. Liebert, Steven M. Michelson