M4 How to block calls

Block calls with specific CallerIDs coming from particular Originator

Within Originator Device settings, "Origination Point" section, "Source (CallerID) Deny" field, put regexp to match CallerIDs you want to block.

Block calls with specific CallerIDs going to particular Terminator

Within the Terminator Device settings, "Termination Point" section, "Source (CallerID) Deny" field, put regexp to match CallerIDs you want to block.

Block calls with specific CallerIDs going to particular Dial Peer

Within Dial Peer Settings, "Source" section, "Source deny regexp" field, put regexp to match CallerIDs you want to block.

Block calls to specific numbers going to particular Dial Peer

Within Dial Peer Settings, "Destination" section, "Destination deny regexp" field, put regexp to match the destination number you want to block.

Block calls with a specific Destination

You are able to block a special Prefix (Destination) by setting a "-1" or "Blocked" Price for chosen Destination in the corresponding Tariff.

There is two ways to set Blocked Destinations. You can set it by importing Rates from CSV with "-1" or the word "Blocked" instead of price or changing Rate Details manually.

Block calls by using Static Blacklisting functionality

Use Number Pools to block calls by Destination or Source numbers.
More information can be found here.