diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index d869ae4..7783ae6 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -4080,7 +4080,7 @@
     adev->mic_mute = state;
 
     if (adev->mode == AUDIO_MODE_IN_CALL) {
-        /* TODO */
+        set_voice_session_mic_mute(adev->voice.session, state);
     }
 
     pthread_mutex_unlock(&adev->lock);
diff --git a/audio/voice.c b/audio/voice.c
index 440329d..01a7b96 100644
--- a/audio/voice.c
+++ b/audio/voice.c
@@ -244,6 +244,13 @@
     ril_set_call_volume(&session->ril, sound_type, volume);
 }
 
+void set_voice_session_mic_mute(struct voice_session *session, bool state)
+{
+    enum _MuteCondition mute_condition = state ? TX_MUTE : TX_UNMUTE;
+
+    ril_set_mute(&session->ril, mute_condition);
+}
+
 bool voice_session_uses_twomic(struct voice_session *session)
 {
     if (session->two_mic_disabled) {
diff --git a/audio/voice.h b/audio/voice.h
index 352e839..10f0fef 100644
--- a/audio/voice.h
+++ b/audio/voice.h
@@ -39,6 +39,7 @@
 void stop_voice_session(struct voice_session *session);
 void set_voice_session_volume(struct voice_session *session, float volume);
 void set_voice_session_audio_path(struct voice_session *session);
+void set_voice_session_mic_mute(struct voice_session *session, bool state);
 
 bool voice_session_uses_twomic(struct voice_session *session);
 bool voice_session_uses_wideband(struct voice_session *session);