Patents by Inventor William R. Stensrud

William R. Stensrud 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).

  • Extension of a local area phone system to a wide area network
    Patent number: 7826868
    Abstract: A soft switch providing wireless PBX voice services to a local area network (WLAN) is used to extend PBX functionality to the cellular domain. A dual mode remote unit is capable of receiving signals both in the cellular system as well as the WLAN. The cellular system is comprised of a data-bearing path and a voice-bearing path. When the dual mode remote unit is within the WLAN, it communicates both voice over IP (VoIP) signaling as well as session initiation protocol (SIP) control signaling over the WLAN. When the remote unit is outside the WLAN, it communicates voice signaling over the voice-bearing path of the cellular network using a standard cellular voice channel. In parallel, it uses the data-bearing path of the cellular network to transmit SIP control signaling.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: November 2, 2010
    Inventors: Barry R. Robbins, William R. Stensrud, Katherine White Umpleby
  • Extension of a local area phone system to a wide area network
    Patent number: 7742768
    Abstract: A soft switch 134 providing wireless PBX voice services to a local area network (WLAN) is used to extend PBX functionality to the cellular domain. A dual mode remote unit is capable of receiving signals both in the cellular system as well as the WLAN. The cellular system is comprised of a data-bearing path and a voice-bearing path. When the dual mode remote unit is within the WLAN, it communicates both voice over IP (VoIP) signaling as well as session initiation protocol (SIP) control signaling over the WLAN. When the remote unit is outside the WLAN, it communicates voice signaling over the voice-bearing path of the cellular network using a standard cellular voice channel. In parallel, it uses the data-bearing path of the cellular network to transmit SIP control signaling.
    Type: Grant
    Filed: March 3, 2006
    Date of Patent: June 22, 2010
    Inventors: Kim Quo-Taht Liu, Shriram Natarajan, Ragunath Devarasu, William R. Stensrud
  • Extension of a local area phone system to a wide area network
    Publication number: 20040072593
    Abstract: A soft switch providing wireless PBX voice services to a local area network (WLAN) is used to extend PBX functionality to the cellular domain. A dual mode remote unit is capable of receiving signals both in the cellular system as well as the WLAN. The cellular system is comprised of a data-bearing path and a voice-bearing path. When the dual mode remote unit is within the WLAN, it communicates both voice over IP (VoIP) signaling as well as session initiation protocol (SIP) control signaling over the WLAN. When the remote unit is outside the WLAN, it communicates voice signaling over the voice-bearing path of the cellular network using a standard cellular voice channel. In parallel, it uses the data-bearing path of the cellular network to transmit SIP control signaling.
    Type: Application
    Filed: December 9, 2002
    Publication date: April 15, 2004
    Inventors: Barry R. Robbins, William R. Stensrud, Katherine White Umpleby