A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : End-to-end Security for Firewall/NAT Traversal within
the Session Initiation Protocol (SIP)
Author(s) : K. Umschaden et al.
Filename : draft-umschaden-smime-midcom-sip-proxy-00.txt
Pages : 37
Date : 2003-5-6
This document describes an extension for the Session Initiation
Protocol (SIP), which enables end-to-end security of the Session
Description Protocol (SDP) together with firewall/Network Address
Translation (NAT) traversal. This solution relies on Secure
Multipurpose Internet Mail Extension (S/MIME) and the middlebox
communications (MIDCOM) protocol. The user authorises a proxy server
to encrypt the session description on behalf of the user. The proxy
determines the capabilities of the receiving party and encrypts the
SDP for a SIP proxy server in the receiving domain. Using MIDCOM,
each proxy can dynamically control its firewall to open pinholes or
request NAT bindings for the media flows. As long as each end-user
may contact its trustworthy SIP proxy via a secure connection and
authorise this proxy to encrypt the signalling data, the session
information is secured end-to-end.
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