How Do I Send All Calls Directly to Voicemail on Galaxy S6

There doesn't seem to be a feature on the Galaxy S6! So far I've only found options to:

Block certain calls, forward certain calls and forward all calls to a specific number.
I want to be able to block all calls from showing up on my screen and just go directly to my voicemail.

I'll be very disappointed and aggravated for the next 18 months if I find that there isn't an option for this. The iPhone 6 has it, my old Galaxy 3 had it. Help please?

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