Its too much work for something that most likley will not go away. If someone wants to pester you enough and you block their caller id, well they can spoof their clid or buy one of those throw away cell phones. That's what most fraudsters are doing.
If you are getting pressured to do something from the higher ups, create a dummy mb greeting and record something like "thank you for calling company x, telecom security department, for security puposes your caller id is being recorded, please hold" then dump them to a mb.
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