Practice call barring
What it is:
A type of controlled phone censorship
Allows for blocking destinations, or certain specific numbers
The customer can instill in their PBX system, blacklists, or destination blockers with tools found online specific to used PBX.
Call barring lets users bar or block certain types of calls, IP addresses, and destinations from being made to or from their phone. Some systems also let users block outbound calls to chosen destinations. Other options allow for only authorized business or employee IP addresses to make calls.
NOTE: Flowroute cannot prevent any inbound caller from reaching a Flowroute DID. Any type of inbound call blocking must be done "locally."