How To Block Direct To Voicemail Calls?

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Pariah Know Your Enemy
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The hospital system I have to use uses a service like slydial to bypass calls directly to voicemail. The phone will ring 2 times but the call cannot be answered. This is fantastically annoying and I want to block a caller ability to use this means of deception.
I know they are using a service to do that because I called and escalated till I got a supervisor who admitted this was what they were doing and defended the practice as being efficient for them. He refused to tell be what service they use but the only one I can find is called slydial.
Any idea?
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How To Block Direct To Voicemail Calls?