Patents by Inventor Michael E Roshko

Michael E Roshko 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).

  • Methods for discovering network address and port translators
    Patent number: 7333500
    Abstract: Network Address and Port Translators (NATs) have the potential to interrupt the end-to-end nature of Internet applications, thereby threatening end-to-end security and other end-to-end functions. Thus it is important to be able to discover the existence of NATs and their type. Accordingly there is provided a method of discovering the existence and type of NAT that involves instigating a test call between media endpoints on a Media Gateway (MG) and a Media Gateway Controller (MGC). The MGC is able to deduce the existence of a NAT by examining the media packets sent to its endpoint. If a NAT is determined to be present the MGC instructs the endpoint on the MG to send media packets to another endpoint on the MGC. By comparing the IP addresses and ports of the media packets received at the endpoints of the MGC, the MGC is able to deduce whether the type of NAT is Cone or Symmetric.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: February 19, 2008
    Assignee: Nortel Networks Limited
    Inventor: Michael E Roshko
  • Methods for discovering network address and port translators
    Publication number: 20040057385
    Abstract: Network Address and Port Translators (NATs) have the potential to interrupt the end-to-end nature of Internet applications, thereby threatening end-to-end security and other end-to-end functions. Thus it is important to be able to discover the existence of NATs and their type. Accordingly there is provided a method of discovering the existence and type of NAT that involves instigating a test call between media endpoints on a Media Gateway (MG) and a Media Gateway Controller (MGC). The MGC is able to deduce the existence of a NAT by examining the media packets sent to its endpoint. If a NAT is determined to be present the MGC instructs the endpoint on the MG to send media packets to another endpoint on the MGC. By comparing the IP addresses and ports of the media packets received at the endpoints of the MGC, the MGC is able to deduce whether the type of NAT is Cone or Symmetric.
    Type: Application
    Filed: September 24, 2002
    Publication date: March 25, 2004
    Inventor: Michael E. Roshko