Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2005-08-09
2005-08-09
Nguyen, Steven (Department: 2665)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S392000, C370S351000, C370S352000, C370S356000, C370S389000, C709S223000, C709S238000
Reexamination Certificate
active
06928082
ABSTRACT:
A method of audio communication utilizing media datagrams between a first telephony client located behind a network address translation (NAT) server and a remote second telephony client is disclosed. Each client utilizes a single port number for both sending and receiving media datagrams. A media datagram is sent from the first telephony client to the second telephony client on a UDP/IP channel utilizing a destination IP address and port number provided by the second telephony client. The second telephony client extracts the source IP address and source port number from the received media datagram to determine if the first telephony client is located behind a NAT server. If the first telephony client is located behind a NAT server, the extracted source IP address and port number are stored and used to send media datagrams to the first telephony client located behind the NAT server.
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Alan B. Johnston, SIP, Understanding The Session Inination Protocol, 2001, pp. 0-52.
Chang Chen-Huei
Cheng Shih-An
Lee Chih-Ping
Liu Fu-Hua
Han Clemence
Innomedia PTe Ltd
Nguyen Steven
O'Hagan Timothy P.
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