SIP swiss army knife
Note: these screenshots have been taken with an old sipsak version, so the output with a more recent version might differ.
A simple test with an Options request if the server responses.

A traceroute run.
Note: because the UA (in line 5) do not include the warning header, sipsak is not able to determine its IP.

A usrloc test with additional invites send to the user.

This site and the project is hosted by: