What does it mean when iphone rings once and does not go to voicemail?

What does it mean when iphone rings once and does not go to voicemail?

The person that is calling hung up or the person being called picked up and hung up, or used an app that does the same for the caller that called.

I block all calls that are not in my contacts, they get a pickup and hang up with no option to leave voicemail. The only people that go to voice mail are those in my contacts that I set up to go directly to voice mail, so those few do not ring through at all.

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