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-02.txt
Pages : 31
Date : 2006-3-7
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.
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
(Transport Layer Security) 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.
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