Function decide 

pub fn decide(table: Option<&Table>, call: &Incoming) -> Decision

Java’s decision (Calls.decide), step for step: the order’s reference, tested here. Outgoing: rings (to an emergency number, Java marks the moment). Incoming: what always rings (an emergency number, a day after you called one, the do-not-disturb list); blocked; “Let every call through”; a second call within 15 minutes; the frame for now. Nothing to decide from: it rings.