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Information on RFC 3581 » RFC Editor

File formats:

Status:

PROPOSED STANDARD

Authors:

J. Rosenberg
H. Schulzrinne

Stream:

IETF

Source:

sip (rai)

Cite this RFC: TXT  |  XML  |   BibTeX

DOI:  https://doi.org/10.17487/RFC3581

Discuss this RFC: Send questions or comments to the mailing list sipcore@ietf.org

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The Session Initiation Protocol (SIP) operates over UDP and TCP, among others. When used with UDP, responses to requests are returned to the source address the request came from, and to the port written into the topmost Via header field value of the request. This behavior is not desirable in many cases, most notably, when the client is behind a Network Address Translator (NAT). This extension defines a new parameter for the Via header field, called "rport", that allows a client to request that the server send the response back to the source IP address and port from which the request originated. [STANDARDS-TRACK]

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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