Patents by Inventor David E. Hanzel

David E. Hanzel 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).

  • Supporting hitless upgrade of call processing nodes in cloud-hosted telephony system
    Patent number: 10146525
    Abstract: A method is provided in which a call agent process that supports one or more Internet Protocol (IP) calls, stores to persistent memory a set of data associated with the one or more IP calls. An outage is detected affecting the one or more IP calls. Using the data retrieved from the persistent memory, the one or more IP calls are resynthesized using a device simulator process to simulate connectivity with endpoints that were participating in the one or more IP calls prior to the outage. After resynthesizing, depending on activity detected from devices associated with the one or more IP calls, the one or more IP calls are internally re-stitched/re-establishing (without signaling to endpoints) with the endpoints involved in the one or more IP calls, or the one or more calls are fully re-stitched/re-established by signaling an endpoint that was participating in the one or more IP calls.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: December 4, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Andre V. Vaguine, Mark L. Hendrickson, David E. Hanzel, Chris Pearce, Rajeev Narang
  • SUPPORTING HITLESS UPGRADE OF CALL PROCESSING NODES IN CLOUD-HOSTED TELEPHONY SYSTEM
    Publication number: 20170353589
    Abstract: A method is provided in which a call agent process that supports one or more Internet Protocol (IP) calls, stores to persistent memory a set of data associated with the one or more IP calls. An outage is detected affecting the one or more IP calls. Using the data retrieved from the persistent memory, the one or more IP calls are resynthesized using a device simulator process to simulate connectivity with endpoints that were participating in the one or more IP calls prior to the outage. After resynthesizing, depending on activity detected from devices associated with the one or more IP calls, the one or more IP calls are internally re-stitched/re-establishing (without signaling to endpoints) with the endpoints involved in the one or more IP calls, or the one or more calls are fully re-stitched/re-established by signaling an endpoint that was participating in the one or more IP calls.
    Type: Application
    Filed: June 2, 2016
    Publication date: December 7, 2017
    Inventors: Andre V. Vaguine, Mark L. Hendrickson, David E. Hanzel, Chris Pearce, Rajeev Narang