System and method for providing fault tolerance in a network...

Details System and method for providing fault tolerance in a network... System and method for providing fault tolerance in a network...

2006-01-31

2006-01-31

Vu, Huy D. (Department: 2665)

Multiplex communications

Fault recovery

C370S352000, C370S474000

Reexamination Certificate

active

06992974

ABSTRACT:
A system and method for providing fault tolerance in a network telephony system. Signaling messages according to a signaling protocol, such as the SIP protocol, are modified to include a path attribute with a network address corresponding to a backup proxy server. When a primary proxy server is supported by a backup proxy server, the primary proxy server inserts the Alternate Path tag into one or more signaling messages. When a network entity sends a message, it checks the message to identify the primary proxy server. Upon receiving a failure or timeout when attempting to send to the primary proxy server, the sending network entity should try the backup proxy server specified in the path attribute. When the backup proxy server receives the message, it may modify the message to specify the new routing path. As a result, subsequent messages get routed properly using the backup proxy server.

REFERENCES:
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patent: 6473396 (2002-10-01), Kumar
patent: 6507562 (2003-01-01), Kadansky et al.
Handley/Schulzrinne/Schooler/Rosenberg, SIP: Session Initiation Protocol, Internet Engineering Task Force, draft-ietf-sip-rfc2543bis-02.ps. Sep. 4, 2000. (131 pages).
H. Schulzrinne et al., “RTP: A Transport Protocol for Real-Time Applications”, IETF RFC 1889, Jan. 1996.
J. Postel, “User Datagram Protocol”, IETF RFC 768, Aug. 1980.
J. Postel, ed., “Internet Protocol”, IETF RFC 791, Sep. 1981.

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