SIP.us is an approved vendor for Vodia PBXes, and as such, configuration is very simple.
After installing Vodia on your server and have created and selected your first domain and click on "VOIP Providers." In the Provider drop-down, select SIP.us and populate your settings with your Trunk # and password:
Click Create and you will be taken back to the Providers page.
If you see "200 OK," then your registration was successful and you're ready to use Vodia with SIP.us.