How do you get incoming call routing to be based on random person in Schedule?

[Calvin]

Hi all, so we have an incoming call configuration routed to particpants in schedule abcd. But it seems to always go to the first person in rotation 1 and not the person in rotation 2?

Is it an escalation policy thing to set up? Say I have it set in an escalation policy to go to "Notify members of on-call schedule" would that then randomly pick a user who is on-call at the time?