diff --git a/app/src/main/java/com/nextcloud/talk/activities/CallActivity.kt b/app/src/main/java/com/nextcloud/talk/activities/CallActivity.kt
index a27a42c0b7..9c40cccf01 100644
--- a/app/src/main/java/com/nextcloud/talk/activities/CallActivity.kt
+++ b/app/src/main/java/com/nextcloud/talk/activities/CallActivity.kt
@@ -3028,16 +3028,25 @@ class CallActivity : CallBaseActivity() {
         @SuppressLint("ClickableViewAccessibility")
         override fun onTouch(v: View, event: MotionEvent): Boolean {
             v.onTouchEvent(event)
-            if (event.action == MotionEvent.ACTION_UP && isPushToTalkActive) {
-                isPushToTalkActive = false
-                binding!!.microphoneButton.setImageResource(R.drawable.ic_mic_off_white_24px)
-                pulseAnimation!!.stop()
-                toggleMedia(false, false)
+            if (isPushToTalkRelease(event.action)) {
+                stopPushToTalk()
             }
             return true
         }
     }
 
+    // ACTION_CANCEL must end push to talk just like ACTION_UP, otherwise the microphone stays enabled although
+    // the gesture was aborted (e.g. by a system gesture or the notification shade) and the button shows "muted".
+    private fun stopPushToTalk() {
+        if (!isPushToTalkActive) {
+            return
+        }
+        isPushToTalkActive = false
+        binding!!.microphoneButton.setImageResource(R.drawable.ic_mic_off_white_24px)
+        pulseAnimation!!.stop()
+        toggleMedia(false, false)
+    }
+
     @Subscribe(threadMode = ThreadMode.BACKGROUND)
     fun onMessageEvent(networkEvent: NetworkEvent) {
         if (networkEvent.networkConnectionEvent == NetworkEvent.NetworkConnectionEvent.NETWORK_CONNECTED) {
@@ -3225,6 +3234,9 @@ class CallActivity : CallBaseActivity() {
         private const val CALLING_TIMEOUT: Long = 45000
         private const val PULSE_ANIMATION_DURATION: Int = 310
 
+        internal fun isPushToTalkRelease(action: Int): Boolean =
+            action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL
+
         private const val DELAY_ON_ERROR_STOP_THRESHOLD: Int = 16
 
         private const val SESSION_ID_PREFFIX_END: Int = 4
diff --git a/app/src/test/java/com/nextcloud/talk/activities/CallActivityPushToTalkTest.kt b/app/src/test/java/com/nextcloud/talk/activities/CallActivityPushToTalkTest.kt
new file mode 100644
index 0000000000..905367b903
--- /dev/null
+++ b/app/src/test/java/com/nextcloud/talk/activities/CallActivityPushToTalkTest.kt
@@ -0,0 +1,38 @@
+/*
+ * Nextcloud Talk - Android Client
+ *
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+package com.nextcloud.talk.activities
+
+import android.view.MotionEvent
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+/**
+ * Push-to-talk release detection ([CallActivity.isPushToTalkRelease]).
+ *
+ * A long-press that ends with ACTION_CANCEL (system gesture, notification shade) must mute the microphone again
+ * just like ACTION_UP, otherwise the mic stays hot while the button shows "muted".
+ */
+class CallActivityPushToTalkTest {
+
+    @Test
+    fun `ACTION_UP ends push to talk`() {
+        assertTrue(CallActivity.isPushToTalkRelease(MotionEvent.ACTION_UP))
+    }
+
+    @Test
+    fun `ACTION_CANCEL ends push to talk`() {
+        assertTrue(CallActivity.isPushToTalkRelease(MotionEvent.ACTION_CANCEL))
+    }
+
+    @Test
+    fun `other actions do not end push to talk`() {
+        assertFalse(CallActivity.isPushToTalkRelease(MotionEvent.ACTION_DOWN))
+        assertFalse(CallActivity.isPushToTalkRelease(MotionEvent.ACTION_MOVE))
+        assertFalse(CallActivity.isPushToTalkRelease(MotionEvent.ACTION_OUTSIDE))
+    }
+}