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 : Managing Client Initiated Connections in the
Session Initiation Protocol (SIP)
Author(s) : C. Jennings, R. Mahy
Filename : draft-ietf-sip-outbound-00.txt
Pages : 24
Date : 2005-7-12
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 NATs, prevent servers from
connecting to User Agents in this way. Even when a proxy server can
open a TCP connection to a User Agent, most User Agents lack a
certificate suitable to act as a TLS server. 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 for
high availability systems.
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