Good question, I think that depends on your phone/settings. If it's just silencing, probably not as to the caller it will keep ringing until VM picks up. If it's declined, that may go straight to VM and the caller may notice a shorter ring and connect the dots.
Edit: autocorrect likes to have a laugh
8 years, 11 months.
I'm going dark in solidarity. 100 minutes to go in my time zone.
Goodbye, u/mutisi0n. Goodbye, Reddit. It's been real.