diff --git a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt
index 53e3a73d..738c478e 100644
--- a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt
+++ b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt
@@ -73,6 +73,10 @@ object NativeLib {
             RadioCallController.reset()
             StreamController.reset(); CallController.reset(); ChatApplication.instance.avatars.stop(); ChatApplication.instance.memberFiles.cancel()
             CallService.requireReleased() // Не останавливать native при неподтверждённой очистке его media-владельца.
+            check(!CallController.blocksMedia()) {
+                LogManager.addLog("ERROR", "Call", "Core teardown blocked: call media preparation still running")
+                "Call media preparation still running"
+            }
         }
     }
 
diff --git a/tools/chatgui-android/call-service-tests/src/main/kotlin/com/utun/chat/data/CallServiceHost.kt b/tools/chatgui-android/call-service-tests/src/main/kotlin/com/utun/chat/data/CallServiceHost.kt
index 7031bbd8..d0f00ec7 100644
--- a/tools/chatgui-android/call-service-tests/src/main/kotlin/com/utun/chat/data/CallServiceHost.kt
+++ b/tools/chatgui-android/call-service-tests/src/main/kotlin/com/utun/chat/data/CallServiceHost.kt
@@ -105,5 +105,5 @@ class RadioAudioEngine {
 data class HostMediaState(val ongoing: Boolean)
 object StreamController { val state = MutableStateFlow<HostMediaState?>(null); fun stopForCall() { state.value = null } }
 object StreamPlayerEngine { val viewing = MutableStateFlow(false); fun stopForCall() { viewing.value = false } }
-object MediaAudioController { fun awaitIdle() {} }
+object MediaAudioController { var beforeIdle: () -> Unit = {}; fun awaitIdle() { beforeIdle() } }
 enum class MediaAudioProfile { AUTO, PHONE, WIRED, BLUETOOTH }
diff --git a/tools/chatgui-android/call-service-tests/src/test/kotlin/com/utun/chat/data/CallServiceLifecycleTest.kt b/tools/chatgui-android/call-service-tests/src/test/kotlin/com/utun/chat/data/CallServiceLifecycleTest.kt
index 9c6d0573..c0df98fe 100644
--- a/tools/chatgui-android/call-service-tests/src/test/kotlin/com/utun/chat/data/CallServiceLifecycleTest.kt
+++ b/tools/chatgui-android/call-service-tests/src/test/kotlin/com/utun/chat/data/CallServiceLifecycleTest.kt
@@ -13,6 +13,7 @@ import com.utun.chat.ChatApplication
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
 import java.util.concurrent.TimeUnit
+import java.util.concurrent.CountDownLatch
 import java.util.concurrent.atomic.AtomicReference
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
@@ -30,6 +31,7 @@ class CallServiceLifecycleTest {
     private lateinit var context: Context
     private val dispatcher = StandardTestDispatcher()
     private val services = mutableListOf<CallService>()
+    private val gates = mutableListOf<CountDownLatch>()
     private val main get() = Looper.getMainLooper()
     private val power get() = requireNotNull(context.powerManager)
     private val manager get() = requireNotNull(context.notificationManager)
@@ -41,6 +43,7 @@ class CallServiceLifecycleTest {
         NativeLib.ready = true; NativeLib.failActivityRequest = false; NativeLib.acceptActivityRequest = true
         AppLanguage.failText = false; AppLanguage.language = "en"; NotificationCompat.failBuild = false
         Handler.rejectImmediate = false; Handler.rejectDelayed = false; PendingIntent.reset()
+        MediaAudioController.beforeIdle = {}
         CallVideoEngine.failCreate = false; CallVideoEngine.created.clear()
         CallController.reset(); RadioAudioEngine.instance().activeGroup.value = null; RadioAudioEngine.instance().restored.clear()
         NativeLib.callCommands.clear(); LogManager.entries.clear(); LogManager.console = true
@@ -48,6 +51,7 @@ class CallServiceLifecycleTest {
     }
 
     @After fun release() {
+        gates.forEach { it.countDown() }; MediaAudioController.beforeIdle = {}
         NativeLib.failActivityRequest = false
         Handler.rejectImmediate = false; Handler.rejectDelayed = false
         AppLanguage.failText = false; NotificationCompat.failBuild = false; CallVideoEngine.failCreate = false
@@ -335,4 +339,13 @@ class CallServiceLifecycleTest {
         assertEquals(CallPhase.ENDED, state?.phase); assertTrue(service.stops > 0)
         assertFalse(manager.active.containsKey(1002)); diagnostic("start failed operation=wake lock")
     }
+
+    @Test fun aCancelledCallStillBlocksCoreTeardownUntilMediaPreparationLeavesNative() {
+        val entered = CountDownLatch(1); val gate = CountDownLatch(1).also { gates.add(it) }
+        MediaAudioController.beforeIdle = { entered.countDown(); check(gate.await(5, TimeUnit.SECONDS)) }
+        request(); dispatcher.scheduler.runCurrent(); assertTrue(entered.await(5, TimeUnit.SECONDS))
+        CallController.reset()
+        assertNull(state); assertFalse(CallService.cleanupPending()); assertTrue(CallController.blocksMedia())
+        gate.countDown(); await("cancelled media preparation finished") { !CallController.blocksMedia() }
+    }
 }