Blink is integrated with the SIP2SIP server functionality. One can change settings directly on the SIP server like Call Forwarding, Do Not Disturb, list of last missed sessions and other settings.
The settings are displayed in "Server Settings window". The window is actually a web interface that loads the URL configured in the Advanced ->Server->Settings URL for each SIP Account. The remote web server can support digest authentication, Blink sends the SIP Account credentials when prompted by the server.