1. Start X-Lite application.

2. Make a right click somewhere at the application display area. Select "SIP Account Settings..." item from the drop-down menu.

3. Select your active SIP profile, press "Properties" button.

4. Go to the "Topology" tab. Make sure "Use local IP address" and "Use specified server" options are selected and uncheck "Unable ICE" checkbox.

5. Go to the "Advanced" tab. Change "Reregister every" value to 300, make sure "Send SIP keep-alives" and "Use rport" checkboxes are checked.