You completely determine what happens when someone calls your fixed number. For this, you can create a Dial Plan in Freedom. In the dial plan, you set exactly which steps an incoming call should go through before you answer the phone (or not). All modules that you have activated and set up in "Admin" are combined here into one unified flow.
Your accessibility therefore depends on how you have set up your dial plan!
What is the difference between a VoIP Account and a User Account?