diff --git a/apps/chanora_flutter/lib/main.dart b/apps/chanora_flutter/lib/main.dart
index 0a40201..32cbf79 100644
--- a/apps/chanora_flutter/lib/main.dart
+++ b/apps/chanora_flutter/lib/main.dart
@@ -718,8 +718,14 @@ class _BetaHomeState extends State<_BetaHome> {
     final next = !_outputMuted;
     try {
       await rust.setOutputMuted(muted: next);
+      await rust.setHardMute(
+        muted: next || _inputMuted || _hardMuteByPermission,
+      );
       if (!mounted) return;
-      setState(() => _outputMuted = next);
+      setState(() {
+        _outputMuted = next;
+        _hardMute = next || _inputMuted || _hardMuteByPermission;
+      });
     } catch (e) {
       if (!mounted) return;
       setState(() => _error = e.toString());
@@ -887,6 +893,7 @@ class _BetaHomeState extends State<_BetaHome> {
       if (!mounted) return;
       setState(() {
         _inputMuted = next;
+        _hardMute = next;
         _hardMuteByPermission = false;
       });
     } catch (e) {
diff --git a/core/chanora_core/src/lib.rs b/core/chanora_core/src/lib.rs
index a98e45e..f5aeece 100644
--- a/core/chanora_core/src/lib.rs
+++ b/core/chanora_core/src/lib.rs
@@ -300,6 +300,13 @@ struct ConnectedState {
     /// for that channel. Kept in memory only; durable secret storage is
     /// a separate storage-schema decision.
     channel_passwords: HashMap<u64, String>,
+    /// Local microphone mute state used to resolve the single
+    /// transmit hard-mute clamp from independent UI mute buttons.
+    local_input_muted: bool,
+    /// Local speaker mute state. Product rule for P0: speaker muted
+    /// also means mic disabled, so this participates in the local
+    /// transmit hard-mute clamp without sending server-side deafen.
+    local_output_muted: bool,
 }
 
 fn normalize_channel_password(password: Option<String>) -> Option<String> {
@@ -610,6 +617,8 @@ impl ChanoraSession {
             sup_inner,
             join_state,
             channel_passwords: HashMap::new(),
+            local_input_muted: false,
+            local_output_muted: false,
         });
 
         // TS3 servers auto-place a newly-connected client into the
@@ -996,15 +1005,23 @@ impl ChanoraSession {
         input: Option<bool>,
         output: Option<bool>,
     ) -> Result<(), CoreError> {
-        let guard = self.inner.lock().await;
-        let state = guard.as_ref().ok_or(CoreError::NotConnected)?;
+        let mut guard = self.inner.lock().await;
+        let state = guard.as_mut().ok_or(CoreError::NotConnected)?;
         // Server-side output mute/deafen makes TeamSpeak/tsclientlib
         // consider the client unable to send audio. That is correct
         // for a server-visible "deafened" state, but our P0 speaker
-        // button is a local playback mute. Keep output mute local-only
-        // so Android can still transmit while the user silences remote
-        // playback on this device.
-        state.protocol.set_muted(input, None).await?;
+        // button is a local playback mute. Keep output mute off the
+        // server-side output/deafen flag, but fold it into the mic
+        // disabled state below because P0 product semantics are:
+        // speaker disabled also means microphone disabled.
+        if let Some(muted) = input {
+            state.local_input_muted = muted;
+        }
+        if let Some(muted) = output {
+            state.local_output_muted = muted;
+        }
+        let mic_disabled = state.local_input_muted || state.local_output_muted;
+        state.protocol.set_muted(Some(mic_disabled), None).await?;
         if let Some(muted) = output {
             if let Some(audio) = state.audio.as_ref() {
                 audio.set_output_muted(muted);
@@ -1019,9 +1036,8 @@ impl ChanoraSession {
         // flooded the log to 200 MB on the Korean test host.
         // Clamp the transmit-mode selector's hard_mute input so
         // the gate goes false too.
-        if let Some(muted) = input {
-            self.voice_selector.set_hard_mute(muted);
-        }
+        self.voice_selector
+            .set_hard_mute(mic_disabled);
         Ok(())
     }