Patents by Inventor Christopher Michael Sherwin

Christopher Michael Sherwin 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 and apparatus for dual-tone multi-frequency signal analysis within a media over internet protocol network
    Patent number: 8031708
    Abstract: In one embodiment, a method includes receiving a media signal associated with a session established based on a session request. The session request is defined at a session exchange device associated with a media over internet protocol (MoIP) network. The method also includes sending a portion of the media signal to a dual-tone multi-frequency (DTMF) analysis module during a sampling time period after a non-sampling time period.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: October 4, 2011
    Assignee: Genband US LLC
    Inventors: Xiaomin Lu, Bruce Mattie, Simon Arthur Oakley, Christopher Michael Sherwin, David Elliott Sturtevant
  • Methods and apparatus for dual-tone multi-frequency signal conversion within a media over internet protocol network
    Patent number: 8018918
    Abstract: In one embodiment, a method includes receiving a first internet protocol (IP) packet having information associated with a dual-tone multi-frequency (DTMF) signal. The information of the first IP packet is configured based on a protocol associated with a first layer of a media over internet protocol (MoIP) network. The first IP packet is associated with a destination endpoint. The method also includes producing a second IP packet having information associated with the DTMF signal. The information of the second IP packet is configured based on a protocol associated with a second layer of the MoIP network and a DTMF conversion policy associated with the destination endpoint. The second layer is different than the first layer.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: September 13, 2011
    Assignee: Genband US LLC
    Inventors: Rakendu Devdhar, Xiaomin Lu, Simon Arthur Oakley, Christopher Michael Sherwin
  • METHODS AND APPARATUS FOR DUAL-TONE MULTI-FREQUENCY SIGNAL ANALYSIS WITHIN A MEDIA OVER INTERNET PROTOCOL NETWORK
    Publication number: 20090168769
    Abstract: In one embodiment, a method includes receiving a media signal associated with a session established based on a session request. The session request is defined at a session exchange device associated with a media over internet protocol (MoIP) network. The method also includes sending a portion of the media signal to a dual-tone multi-frequency (DTMF) analysis module during a sampling time period after a non-sampling time period.
    Type: Application
    Filed: December 27, 2007
    Publication date: July 2, 2009
    Inventors: Xiaomin LU, Bruce Mattie, Simon Arthur Oakley, Christopher Michael Sherwin, David Elliott Sturtevant
  • METHODS AND APPARATUS FOR DUAL-TONE MULTI-FREQUENCY SIGNAL CONVERSION WITHIN A MEDIA OVER INTERNET PROTOCOL NETWORK
    Publication number: 20090003315
    Abstract: In one embodiment, a method includes receiving a first internet protocol (IP) packet having information associated with a dual-tone multi-frequency (DTMF) signal. The information of the first IP packet is configured based on a protocol associated with a first layer of a media over internet protocol (MoIP) network. The first IP packet is associated with a destination endpoint. The method also includes producing a second IP packet having information associated with the DTMF signal. The information of the second IP packet is configured based on a protocol associated with a second layer of the MoIP network and a DTMF conversion policy associated with the destination endpoint. The second layer is different than the first layer.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Inventors: Rakendu DEVDHAR, Xiaomin Lu, Simon Arthur Oakley, Christopher Michael Sherwin