diff --git a/mobile/plugins/native-call/android/src/main/AndroidManifest.xml b/mobile/plugins/native-call/android/src/main/AndroidManifest.xml
index b43d522..b766b27 100644
--- a/mobile/plugins/native-call/android/src/main/AndroidManifest.xml
+++ b/mobile/plugins/native-call/android/src/main/AndroidManifest.xml
@@ -6,9 +6,6 @@
     <uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
     <uses-permission android:name="android.permission.VIBRATE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
-    <!-- Ask to be exempt from battery optimization so high-priority FCM call-wakes reach the app when it's
-         been swiped away / Dozing (OnePlus/Oppo hold data messages otherwise → the ring arrives too late). -->
-    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
 
     <application>
         <!-- Our FirebaseMessagingService REPLACES the @capacitor/push-notifications one: it handles call-wake
diff --git a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/BzCallMessagingService.java b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/BzCallMessagingService.java
index ca617a2..f58fc8d 100644
--- a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/BzCallMessagingService.java
+++ b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/BzCallMessagingService.java
@@ -1,5 +1,7 @@
 package com.bizgaze.connect.nativecall;
 
+import android.util.Log;
+
 import androidx.annotation.NonNull;
 
 import com.google.firebase.messaging.RemoteMessage;
@@ -20,6 +22,8 @@ public class BzCallMessagingService extends com.capacitorjs.plugins.pushnotifica
     @Override
     public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
         Map<String, String> data = remoteMessage.getData();
+        Log.i("bzcall", "FCM onMessageReceived: bzcall=" + (data == null ? "null" : data.get("bzcall"))
+                + " type=" + (data == null ? "" : data.get("type")) + " keys=" + (data == null ? "0" : data.keySet()));
         if (data != null && "1".equals(data.get("bzcall"))) {
             String type = data.get("type");
             String uuid = data.get("callUUID");
diff --git a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/CallStore.java b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/CallStore.java
index 963cd0e..fb994cb 100644
--- a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/CallStore.java
+++ b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/CallStore.java
@@ -5,10 +5,8 @@ import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
-import android.media.AudioAttributes;
-import android.media.RingtoneManager;
-import android.net.Uri;
 import android.os.Build;
+import android.util.Log;
 
 import androidx.core.app.NotificationCompat;
 import androidx.core.app.NotificationManagerCompat;
@@ -21,7 +19,10 @@ import java.util.concurrent.ConcurrentHashMap;
 // time is assumed (a single NOTIF_ID), matching the app's 1:1 / single-group-call model.
 class CallStore {
 
-    static final String CHANNEL_ID = "bzc_incoming_calls";
+    // v2: SILENT channel. The ring + vibration are driven by IncomingCallActivity (a single, looping source);
+    // if the channel also played a sound we'd get the "ring twice overlapping" the user reported. A channel's
+    // sound is immutable once created, so we bump the id to apply the new silent config on existing installs.
+    static final String CHANNEL_ID = "bzc_incoming_calls_v2";
     static final int NOTIF_ID = 2748;
 
     static final String ACTION_RING = "com.bizgaze.connect.nativecall.RING";
@@ -42,14 +43,9 @@ class CallStore {
         if (nm == null || nm.getNotificationChannel(CHANNEL_ID) != null) return;
         NotificationChannel ch = new NotificationChannel(CHANNEL_ID, "Incoming calls", NotificationManager.IMPORTANCE_HIGH);
         ch.setDescription("Ringing for incoming Biz Connect calls");
-        Uri ring = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
-        AudioAttributes attrs = new AudioAttributes.Builder()
-                .setUsage(AudioAttributes.USAGE_NOTIFICATION_RINGTONE)
-                .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
-                .build();
-        if (ring != null) ch.setSound(ring, attrs);
-        ch.enableVibration(true);
-        ch.setVibrationPattern(new long[]{0, 700, 700, 700, 700});
+        // Silent + no vibration: IncomingCallActivity owns the ring + vibration (single source, avoids overlap).
+        ch.setSound(null, null);
+        ch.enableVibration(false);
         ch.setLockscreenVisibility(NotificationCompat.VISIBILITY_PUBLIC);
         nm.createNotificationChannel(ch);
     }
@@ -72,8 +68,11 @@ class CallStore {
     // screen when allowed; otherwise shows as a heads-up with Accept/Decline buttons).
     static void showIncoming(Context ctx, Map<String, String> call) {
         String uuid = call.get("callUUID");
-        if (uuid == null || ended.contains(uuid)) return;
-        active.add(uuid);
+        Log.i("bzcall", "showIncoming uuid=" + uuid + " caller=" + call.get("callerName"));
+        if (uuid == null || ended.contains(uuid)) { Log.i("bzcall", "showIncoming skipped (ended/no-uuid)"); return; }
+        // Atomic dedup: add() returns false if already ringing → the FCM push and the WebSocket path can't both
+        // raise the same call (that was the "ring comes twice" bug).
+        if (!active.add(uuid)) { Log.i("bzcall", "showIncoming skipped (already ringing)"); return; }
         ensureChannel(ctx);
 
         String title = call.get("callerName");
@@ -91,6 +90,7 @@ class CallStore {
                 .setCategory(NotificationCompat.CATEGORY_CALL)
                 .setPriority(NotificationCompat.PRIORITY_HIGH)
                 .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+                .setOnlyAlertOnce(true)
                 .setOngoing(true)
                 .setAutoCancel(false)
                 .setContentIntent(full)
@@ -100,7 +100,10 @@ class CallStore {
 
         try {
             NotificationManagerCompat.from(ctx).notify(NOTIF_ID, b.build());
-        } catch (SecurityException ignored) { /* POST_NOTIFICATIONS not granted */ }
+            Log.i("bzcall", "incoming-call notification posted (full-screen intent)");
+        } catch (SecurityException e) {
+            Log.w("bzcall", "notify() blocked — POST_NOTIFICATIONS not granted: " + e.getMessage());
+        }
     }
 
     static void cancel(Context ctx) {
diff --git a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/IncomingCallActivity.java b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/IncomingCallActivity.java
index e3dc36b..9cbf20e 100644
--- a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/IncomingCallActivity.java
+++ b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/IncomingCallActivity.java
@@ -10,6 +10,7 @@ import android.media.RingtoneManager;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
+import android.util.Log;
 import android.view.Gravity;
 import android.view.View;
 import android.view.WindowManager;
@@ -27,6 +28,7 @@ public class IncomingCallActivity extends Activity {
     private static IncomingCallActivity current;
 
     private Ringtone ringtone;
+    private android.os.Vibrator vibrator;
     private JSObject callData;
     private boolean handled = false;
 
@@ -46,6 +48,7 @@ public class IncomingCallActivity extends Activity {
 
     private void handleIntent(Intent intent) {
         String action = intent != null ? intent.getAction() : null;
+        Log.i("bzcall", "IncomingCallActivity action=" + action);
         callData = extras(intent);
         if (CallStore.ACTION_ACCEPT.equals(action)) { doAccept(); return; }
         if (CallStore.ACTION_DECLINE.equals(action)) { doDecline(); return; }
@@ -188,11 +191,23 @@ public class IncomingCallActivity extends Activity {
     private void startRinging() {
         try {
             Uri uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
-            if (uri == null) return;
-            ringtone = RingtoneManager.getRingtone(getApplicationContext(), uri);
-            if (ringtone != null) {
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) ringtone.setLooping(true);
-                ringtone.play();
+            if (uri != null) {
+                ringtone = RingtoneManager.getRingtone(getApplicationContext(), uri);
+                if (ringtone != null) {
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) ringtone.setLooping(true);
+                    ringtone.play();
+                }
+            }
+        } catch (Exception ignored) {}
+        try {
+            vibrator = (android.os.Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
+            if (vibrator != null && vibrator.hasVibrator()) {
+                long[] pattern = {0, 800, 1000};
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                    vibrator.vibrate(android.os.VibrationEffect.createWaveform(pattern, 0)); // 0 = repeat from start
+                } else {
+                    vibrator.vibrate(pattern, 0);
+                }
             }
         } catch (Exception ignored) {}
     }
@@ -200,6 +215,8 @@ public class IncomingCallActivity extends Activity {
     private void stopRinging() {
         try { if (ringtone != null && ringtone.isPlaying()) ringtone.stop(); } catch (Exception ignored) {}
         ringtone = null;
+        try { if (vibrator != null) vibrator.cancel(); } catch (Exception ignored) {}
+        vibrator = null;
     }
 
     private void doAccept() {
diff --git a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/NativeCallPlugin.java b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/NativeCallPlugin.java
index df1f2b3..3f61983 100644
--- a/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/NativeCallPlugin.java
+++ b/mobile/plugins/native-call/android/src/main/java/com/bizgaze/connect/nativecall/NativeCallPlugin.java
@@ -113,35 +113,6 @@ public class NativeCallPlugin extends Plugin {
     // Increment 1: mute is handled by the WebView (it owns the media). No-op so the shared bridge doesn't reject.
     @PluginMethod public void setMuted(PluginCall call) { call.resolve(); }
 
-    // Ask the OS to exempt the app from battery optimization. Without this, aggressive OEMs (OnePlus/Oppo/Xiaomi)
-    // hold high-priority FCM call-wake messages while the app is swiped-away/Dozing, so an incoming call doesn't
-    // ring until it's already over. Shows the system "allow background activity" dialog once; harmless if already
-    // exempt. (OEM "auto-launch"/"allow background" toggles are separate and can only be enabled by the user.)
-    @PluginMethod
-    public void requestCallReliability(PluginCall call) {
-        com.getcapacitor.JSObject ret = new com.getcapacitor.JSObject();
-        try {
-            android.content.Context ctx = getContext();
-            android.os.PowerManager pm = (android.os.PowerManager) ctx.getSystemService(android.content.Context.POWER_SERVICE);
-            String pkg = ctx.getPackageName();
-            boolean ignoring = pm != null && pm.isIgnoringBatteryOptimizations(pkg);
-            ret.put("ignoringBatteryOptimizations", ignoring);
-            if (!ignoring && Boolean.TRUE.equals(call.getBoolean("prompt", true))) {
-                android.app.Activity act = getActivity();
-                android.content.Context launcher = act != null ? act : ctx;
-                android.content.Intent i = new android.content.Intent(
-                        android.provider.Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS,
-                        android.net.Uri.parse("package:" + pkg));
-                i.addFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK);
-                launcher.startActivity(i);
-                ret.put("prompted", true);
-            }
-        } catch (Exception e) {
-            ret.put("error", e.getMessage() == null ? "failed" : e.getMessage());
-        }
-        call.resolve(ret);
-    }
-
     // --- Increment 2+ methods (video / screen-share / hole-punch / #12 reconnect / #5 transcript). Safe no-ops
     // for now so the shared web bridge never rejects on Android; real bodies land with the native-media build. ---
     @PluginMethod public void reconnectRoom(PluginCall call) { call.resolve(); }
diff --git a/server/public/home.html b/server/public/home.html
index 54aa0a4..5236ea1 100644
--- a/server/public/home.html
+++ b/server/public/home.html
@@ -4350,9 +4350,6 @@ async function setupNativeCall(){
     // token is already registered by setupNativePush — the server call-wake targets it, so no token step here.
     if(!cfg || !cfg.androidCall){ console.log('[nativecall] Android native calling disabled by server — using WebView calls'); return; }
     _callkitReady=true; _callWebViewMedia=true;
-    // Ask for a battery-optimization exemption so a killed/Dozing phone still gets the high-priority FCM
-    // call-wake in time to ring (OnePlus/Oppo hold it otherwise). Prompt only the first time; then just check.
-    try{ if(NC.requestCallReliability){ const asked=localStorage.getItem('bzcCallRelAsked'); const rel=await NC.requestCallReliability({ prompt: !asked }); localStorage.setItem('bzcCallRelAsked','1'); if(rel && rel.ignoringBatteryOptimizations===false) console.log('[nativecall] app is NOT exempt from battery optimization — killed-state ring may be delayed until this is allowed'); } }catch(_){}
   } else {
     // iOS CallKit: native media (the plugin owns this identity's one LiveKit connection). Flipped on once native
     // media carries the audio.