Patents by Inventor Yoshie Yamaguchi

Yoshie Yamaguchi 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).

  • Method for DTMF transfer by RTP
    Patent number: 7778243
    Abstract: A method for DTMF transmission between different address systems in a communication system containing a first network (NW) 20A including an SIP terminal 41A connected to an SIP server 30A, a second network (NW) 20B including an SIP terminal 41B connected to an SIP server 30B, and an SIP converter 10 connecting the first and the second NWs. When the SIP converter 10 detects coded DTMF information from one of the NWs while a session is established between the SIP terminal 41A and the SIP terminal 41B, the SIP converter 10 determines whether the other of the NWs supports the coded DTMF information. If the other of the NWs does not support the coded DTMF information, the SIP converter 10 stores voice-data DTMF corresponding to the coded DTMF information into a payload of RTP and transfers the information to the SIP terminal of the other network.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: August 17, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yoshie Yamaguchi, Masahito Hirokawa, Makoto Kumada, Yusuke Sato, Masayuki Ono
  • Method for DTMF transfer by RTP
    Publication number: 20060120344
    Abstract: A method for DTMF transmission between different address systems in a communication system containing a first network (NW) 20A including an SIP terminal 41A connected to an SIP server 30A, a second network (NW) 20B including an SIP terminal 41B connected to an SIP server 30B, and an SIP converter 10 connecting the first and the second NWs. When the SIP converter 10 detects coded DTMF information from one of the NWs while a session is established between the SIP terminal 41A and the SIP terminal 41B, the SIP converter 10 determines whether the other of the NWs supports the coded DTMF information. If the other of the NWs does not support the coded DTMF information, the SIP converter 10 stores voice-data DTMF corresponding to the coded DTMF information into a payload of RTP and transfers the information to the SIP terminal of the other network.
    Type: Application
    Filed: August 31, 2005
    Publication date: June 8, 2006
    Inventors: Yoshie Yamaguchi, Masahito Hirokawa, Makoto Kumada, Yusuke Sato, Masayuki Ono