M4 How to block calls
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Block calls with a specific CallerID coming from specific Originator
Within Originator Device settings, "Origination Point" section, "Source (CallerID) Deny" field, put regexp to match CallerIDs you want to block.
Block calls with a specific CallerID going to specific Terminator
Within Terminator Device settins, "Termination Point" section, "Source (CallerID) Deny" field, regexp to match CallerIDs you want to block.