fix(proxy-engine): respect explicit inbound route targets and store voicemail in the configured mailbox

rust/crates/proxy-engine/src/config.rs

@@ -373,12 +373,14 @@ pub struct OutboundRouteResult {
 
 /// Result of resolving an inbound route.
 //
-// `device_ids` and `ring_browsers` are consumed by create_inbound_call.
+// `device_ids`, `ring_all_devices`, and `ring_browsers` are consumed by
+// create_inbound_call.
 // The remaining fields (voicemail_box, ivr_menu_id, no_answer_timeout)
 // are resolved but not yet acted upon — see the multi-target TODO.
 #[allow(dead_code)]
 pub struct InboundRouteResult {
     pub device_ids: Vec<String>,
+    pub ring_all_devices: bool,
     pub ring_browsers: bool,
     pub voicemail_box: Option<String>,
     pub ivr_menu_id: Option<String>,
@@ -485,8 +487,10 @@ impl AppConfig {
                 continue;
             }
 
+            let explicit_targets = route.action.targets.clone();
             return Some(InboundRouteResult {
-                device_ids: route.action.targets.clone().unwrap_or_default(),
+                device_ids: explicit_targets.clone().unwrap_or_default(),
+                ring_all_devices: explicit_targets.is_none(),
                 ring_browsers: route.action.ring_browsers.unwrap_or(false),
                 voicemail_box: route.action.voicemail_box.clone(),
                 ivr_menu_id: route.action.ivr_menu_id.clone(),