Information security – Access control or authentication – Network
Reexamination Certificate
2004-03-03
2009-08-11
Lanier, Benjamin E (Department: 2432)
Information security
Access control or authentication
Network
C726S014000, C726S015000
Reexamination Certificate
active
07574736
ABSTRACT:
Enabling media (audio/video) scenarios across firewalls typically requires opening up multiple UDP ports in an external firewall. This is so because RTP (Real Time Protocol, RFC 1889), which is the protocol used to carry media packets over IP network, requires a separate UDP receive port for each media source. Opening up multiple media ports on the external firewall is something that administrators are not comfortable doing as they consider it security vulnerability. The system and method according to the invention provides an alternate mechanism which changes RTP protocol a little and achieves a goal of traversing firewalls for media packets using a fixed number, namely two, of UDP ports.
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Kimchi Gur
Salapaka Rao
Shoroff Srikanth
Lanier Benjamin E
Microsoft Corporation
Perkins Coie LLP
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