I-D Action:draft-ietf-sip-outbound-12.txt

A New Internet-Draft is available from the on-line
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This draft is a work item of the Session Initiation Protocol
Working Group of the IETF.


	Title           : Managing Client Initiated Connections in
the Session Initiation Protocol (SIP)
	Author(s)       : C. Jennings, R. Mahy
	Filename        : draft-ietf-sip-outbound-12.txt
	Pages           : 50
	Date            : 2008-02-25

The Session Initiation Protocol (SIP) allows proxy servers
to
initiate TCP connections and send asynchronous UDP datagrams
to User
Agents in order to deliver requests.  However, many
practical
considerations, such as the existence of firewalls and
Network
Address Translators (NATs), 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.

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-sip-outbound-12.txt

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