I believe that should work for you providing your VoIP provider allows anonymous caller id. I’ve been using this for over 10 years and I tested it yesterday and it works for me. The word hidden blocks the name and number. You don’t have to code anonymous. The telephone company provides that detail when they see the caller id is hidden. Some telephone companies may display “OUT OF AREA” for hidden caller id. It depends on the phone company that your call is routed to.
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