A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : SIP Conventions for UAs with Outbound Only Connections
Author(s) : C. Jennings, A. Hawrylyshen
Filename : draft-jennings-sipping-outbound-01.txt
Pages : 17
Date : 2005-2-22
Often with SIP a request can only be routed over an existing
connection or flow, such as when there is a firewall or network
address translation (NAT) device in the network path. TLS is also
affected when the user agent (UA) does not have a certificate
suitable for mutual TLS authentication. This draft addresses how
user agents and proxies need to behave to work in these environments.
This work shows how existing SIP mechanisms can be used to allow the
UA to register multiple times over different connections or flows and
the proxies can use the instance-id in the contact header to identify
that the multiple flows go to the same UA. It can then choose which
flow to use to route requests to this UA.
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