How can we block the incoming calls "Spam" calls on the Collaborate Pro / Collaborate Live system ?

How can we block the incoming calls "Spam" calls on the Collaborate Pro / Collaborate Live system ?

Access the IP address of the system with a web browser to use the Web GUI.  The web GUI must be enabled in the admin settings, and may be password protected.

Open the system’s web UI and go to "Settings>General>Calls" Select the Check Box Block incoming SIP calls