diff --git a/crates/chanora_audio/src/ios_voice_unit.rs b/crates/chanora_audio/src/ios_voice_unit.rs
index 44a4e2d..b730325 100644
--- a/crates/chanora_audio/src/ios_voice_unit.rs
+++ b/crates/chanora_audio/src/ios_voice_unit.rs
@@ -406,38 +406,20 @@ impl IosCaptureState {
                     speech: true,
                 }
             } else if vad_backend == crate::VadBackend::SileroOnnx {
-                match crate::vad::callback_vad_worker_policy(
-                    voice_activity_mode,
-                    vad_backend,
-                    self.silero_coreml_worker.is_some(),
-                ) {
-                    crate::vad::VadWorkerPolicy::UseWorker => {
-                        let worker = self
-                            .silero_coreml_worker
-                            .as_ref()
-                            .expect("policy checked worker");
-                        let enqueued = worker.try_send(capture_seq, &frame);
-                        if !worker.is_stale(capture_seq) {
-                            let p = worker.latest_probability();
-                            crate::vad::VadOutput {
-                                probability: p,
-                                speech: p >= 0.5,
-                            }
-                        } else if enqueued {
-                            crate::vad::VadOutput {
-                                probability: 0.0,
-                                speech: false,
-                            }
-                        } else {
-                            used_fallback_vad = true;
-                            self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
-                            crate::vad::VoiceActivityDetector::process_10ms(
-                                &mut self.vad_detector,
-                                &frame,
-                            )
+                if let Some(worker) = self.silero_coreml_worker.as_ref() {
+                    let enqueued = worker.try_send(capture_seq, &frame);
+                    if !worker.is_stale(capture_seq) {
+                        let p = worker.latest_probability();
+                        crate::vad::VadOutput {
+                            probability: p,
+                            speech: p >= 0.5,
                         }
-                    }
-                    crate::vad::VadWorkerPolicy::UseFallback => {
+                    } else if enqueued {
+                        crate::vad::VadOutput {
+                            probability: 0.0,
+                            speech: false,
+                        }
+                    } else {
                         used_fallback_vad = true;
                         self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
                         crate::vad::VoiceActivityDetector::process_10ms(
@@ -445,10 +427,13 @@ impl IosCaptureState {
                             &frame,
                         )
                     }
-                    crate::vad::VadWorkerPolicy::NotModelBacked => crate::vad::VadOutput {
-                        probability: 1.0,
-                        speech: true,
-                    },
+                } else {
+                    used_fallback_vad = true;
+                    self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
+                    crate::vad::VoiceActivityDetector::process_10ms(
+                        &mut self.vad_detector,
+                        &frame,
+                    )
                 }
             } else {
                 crate::vad::VoiceActivityDetector::process_10ms(&mut self.vad_detector, &frame)