Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2008-03-18
2008-03-18
Ni, Suhan (Department: 2615)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S354000
Reexamination Certificate
active
10271183
ABSTRACT:
A network address translation apparatus and method within a Voice over Internet Protocol (VoIP) router is described. This apparatus and method operates within networking devices such as routers, switches, bridges, etc. These devices masks both source and destination addresses and may either replace or complement a firewall in providing security. According to one embodiment, network type information, corresponding to the gateways within connection, is embedded in a port number within a packet header. This network type information is extracted and analyzed to identify the network types of both gateways within the connection. According to another embodiment, a port number is assigned according to the network types of both gateways within a connection. Thus, this network type information may be identified by processing the port number on which a packet is received.
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Chou Chih-Hsiang
Lai Poh Yoke
Noor Halim Md
Ow Sin Ming
Reddy Janardhana
Fenwick & West LLP
MediaRing Ltd.
Ni Suhan
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