What about stund?
http://freshmeat.net/projects/stund/
It has a working client, and a 'Freely Distributable' license.
On Tue, 21 Feb 2006, Olle E Johansson wrote:
21 feb 2006 kl. 21.47 skrev Rich Adamson:
Stun's primary role in life is to operate as an internet accessible
application to determine the outside IP address of your firewall or
nat box. Its usually called (by a sip phone as one example) at startup,
and the stun server returns the real outside IP address.
Right. And to add to this excellent explanation:
STUN is a discovery protocol. It does not change anything in your network.
It discovers properties about a NAT between the device and the STUN server
and
thus helps the phone to automatically configure communication parameters that
assists NAT traversal.
Outside IP address is one of them, but even more important is the
functionality
of the NAT - how it can handle SIP signalling from one endpoint (sip proxy)
and audio from a completely different and unknown endpoint (the phone).
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