diff --git a/modules/audio_processing/audio_processing_impl.cc b/modules/audio_processing/audio_processing_impl.cc
index 8b9044f..377f78f 100644
--- a/modules/audio_processing/audio_processing_impl.cc
+++ b/modules/audio_processing/audio_processing_impl.cc
@@ -568,6 +568,14 @@
   return delay_offset_ms_;
 }
 
+void AudioProcessingImpl::set_stream_key_pressed(bool key_pressed) {
+  key_pressed_ = key_pressed;
+}
+
+bool AudioProcessingImpl::stream_key_pressed() const {
+  return key_pressed_;
+}
+
 int AudioProcessingImpl::StartDebugRecording(
     const char filename[AudioProcessing::kMaxFilenameSize]) {
   CriticalSectionScoped crit_scoped(crit_);
diff --git a/modules/audio_processing/audio_processing_impl.h b/modules/audio_processing/audio_processing_impl.h
index 249b789..3b46ba8 100644
--- a/modules/audio_processing/audio_processing_impl.h
+++ b/modules/audio_processing/audio_processing_impl.h
@@ -76,6 +76,8 @@
   virtual int stream_delay_ms() const OVERRIDE;
   virtual void set_delay_offset_ms(int offset) OVERRIDE;
   virtual int delay_offset_ms() const OVERRIDE;
+  virtual void set_stream_key_pressed(bool key_pressed) OVERRIDE;
+  virtual bool stream_key_pressed() const OVERRIDE;
   virtual int StartDebugRecording(
       const char filename[kMaxFilenameSize]) OVERRIDE;
   virtual int StartDebugRecording(FILE* handle) OVERRIDE;
@@ -134,6 +136,8 @@
   int num_reverse_channels_;
   int num_input_channels_;
   int num_output_channels_;
+
+  bool key_pressed_;
 };
 }  // namespace webrtc
 
diff --git a/modules/audio_processing/include/audio_processing.h b/modules/audio_processing/include/audio_processing.h
index 09d4cd4..82e6e50 100644
--- a/modules/audio_processing/include/audio_processing.h
+++ b/modules/audio_processing/include/audio_processing.h
@@ -231,6 +231,11 @@
   virtual int set_stream_delay_ms(int delay) = 0;
   virtual int stream_delay_ms() const = 0;
 
+  // Call to signal that a key press occurred (true) or did not occur (false)
+  // with this chunk of audio.
+  virtual void set_stream_key_pressed(bool key_pressed) = 0;
+  virtual bool stream_key_pressed() const = 0;
+
   // Sets a delay |offset| in ms to add to the values passed in through
   // set_stream_delay_ms(). May be positive or negative.
   //
diff --git a/modules/audio_processing/include/mock_audio_processing.h b/modules/audio_processing/include/mock_audio_processing.h
index 46520ab..9ef7904 100644
--- a/modules/audio_processing/include/mock_audio_processing.h
+++ b/modules/audio_processing/include/mock_audio_processing.h
@@ -209,6 +209,10 @@
       int(int delay));
   MOCK_CONST_METHOD0(stream_delay_ms,
       int());
+  MOCK_METHOD1(set_stream_key_pressed,
+      void(bool key_pressed));
+  MOCK_CONST_METHOD0(stream_key_pressed,
+      bool());
   MOCK_METHOD1(set_delay_offset_ms,
       void(int offset));
   MOCK_CONST_METHOD0(delay_offset_ms,
diff --git a/voice_engine/transmit_mixer.cc b/voice_engine/transmit_mixer.cc
index 22aabb7..e9394f7 100644
--- a/voice_engine/transmit_mixer.cc
+++ b/voice_engine/transmit_mixer.cc
@@ -362,7 +362,7 @@
     }
 
     // --- Near-end audio processing.
-    ProcessAudio(totalDelayMS, clockDrift, currentMicLevel);
+    ProcessAudio(totalDelayMS, clockDrift, currentMicLevel, keyPressed);
 
     if (swap_stereo_channels_ && stereo_codec_)
       // Only bother swapping if we're using a stereo codec.
@@ -1309,7 +1309,7 @@
 }
 
 void TransmitMixer::ProcessAudio(int delay_ms, int clock_drift,
-                                 int current_mic_level) {
+                                 int current_mic_level, bool key_pressed) {
   if (audioproc_->set_stream_delay_ms(delay_ms) != 0) {
     // A redundant warning is reported in AudioDevice, which we've throttled
     // to avoid flooding the logs. Relegate this one to LS_VERBOSE to avoid
@@ -1328,6 +1328,8 @@
     aec->set_stream_drift_samples(clock_drift);
   }
 
+  audioproc_->set_stream_key_pressed(key_pressed);
+
   int err = audioproc_->ProcessStream(&_audioFrame);
   if (err != 0) {
     LOG(LS_ERROR) << "ProcessStream() error: " << err;
diff --git a/voice_engine/transmit_mixer.h b/voice_engine/transmit_mixer.h
index 225d4ac..58bc73d 100644
--- a/voice_engine/transmit_mixer.h
+++ b/voice_engine/transmit_mixer.h
@@ -184,7 +184,8 @@
     int32_t MixOrReplaceAudioWithFile(
         int mixingFrequency);
 
-    void ProcessAudio(int delay_ms, int clock_drift, int current_mic_level);
+    void ProcessAudio(int delay_ms, int clock_drift, int current_mic_level,
+                      bool key_pressed);
 
 #ifdef WEBRTC_VOICE_ENGINE_TYPING_DETECTION
     void TypingDetection(bool keyPressed);