Subject: [Sip] [sip] I-D Action:draft-ietf-sip-outbound-18.txt

From: "DRAGE, Keith (Keith)" <[email-masked]>
Date: Wed, 27 May 2009 12:35:46 +0200

Sending to the SIP list as the announcement seems to have failed to make it.

Keith

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Dispatch Working Group of the IETF.

	Title           : Managing Client Initiated Connections in the Session Initiation Protocol (SIP)
	Author(s)       : C. Jennings
	Filename        : draft-ietf-sip-outbound-18.txt
	Pages           : 49
	Date            : 2009-05-26

The Session Initiation Protocol (SIP) allows proxy servers to initiate TCP connections or to send asynchronous UDP datagrams to User Agents in order to deliver requests.  However, in a large number of real deployments, many practical considerations, such as the existence of firewalls and Network Address Translators (NATs) or the use of TLS with server-provided certificates, prevent servers from connecting to User Agents in this way.  This specification defines behaviors for User Agents, registrars and proxy servers that allow requests to be delivered on existing connections established by the User Agent.  It also defines keep alive behaviors needed to keep NAT bindings open and specifies the usage of multiple connections from the User Agent to its Registrar.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-sip-outbound-18.txt

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft.