[Fwd: [Sip] I-D ACTION:draft-ietf-sip-symmetric-response-00.txt]

[Jonathan Rosenberg <[e-mail]>]

Folks,

This draft is an update to draft-ietf-sip-nat-02. The name has been 
changed to reflect the fact that it is not NAT traversal for sip. Some 
of the other changes in this version:

* addition of an UNSAF considerations section, addressing the issues 
pointed out in 
http://www.ietf.org/internet-drafts/draft-iab-unsaf-considerations-02.txt.

* clarification that responses need to be sent from the address/port on 
which the request was received

* addition of branch IDs to the example via headers

* updated references

It also incorporates the various comments received during working group 
last call. I believe this document is now ready to go to iesg.

Thanks,
Jonathan R.
-- 
Jonathan D. Rosenberg, Ph.D.                72 Eagle Rock Ave.
Chief Scientist                             First Floor
dynamicsoft                                 East Hanover, NJ 07936
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http://www.jdrosen.net                      PHONE: [phone]
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Session Initiation Protocol Working Group of the IETF.

	Title		: An Extension to the Session Initiation Protocol (SIP) 
                          for Symmetric Response Routing
	Author(s)	: J. Rosenberg, J. Weinberger, H. Schulzrinne
	Filename	: draft-ietf-sip-symmetric-response-00.txt
	Pages		: 12
	Date		: 2002-9-30
	
The Session Initiation Protocol (SIP) operates over UDP and TCP. 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 where the request came from.

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