Find the IP address of your phone. To do so press the button that looks like a sheet of paper then "9" (on the dial pad). Open a web browser and type the IP address in the address bar. You will need to be logged in as administrator to make these changes. Click on Admin Login in the top right corner. Switch to "advanced" mode in the same location. To be able to make calls set up the SIP/Proxy info. Go to "Ext 1" section. Navigate to the "Proxy and Registration" section and fill the inputs with your servers information (keep in mind that, for a weird reason, "Proxy" is actually the SIP server and the "Alternate Proxy" is the backup SIP server; for our system you do not have to enter the "Alternate Proxy)....