diff --git a/webrtc/voice_engine/include/voe_rtp_rtcp.h b/webrtc/voice_engine/include/voe_rtp_rtcp.h
index df1fef7e4..30d8add8c 100644
--- a/webrtc/voice_engine/include/voe_rtp_rtcp.h
+++ b/webrtc/voice_engine/include/voe_rtp_rtcp.h
@@ -220,6 +220,14 @@ public:
     virtual int GetFECStatus(
         int channel, bool& enabled, int& redPayloadtype) = 0;
 
+    // This function enables Negative Acknowledgment (NACK) using RTCP,
+    // implemented based on RFC 4585. NACK retransmits RTP packets if lost on
+    // the network. This creates a lossless transport at the expense of delay.
+    // If using NACK, NACK should be enabled on both endpoints in a call.
+    virtual int SetNACKStatus(int channel,
+                              bool enable,
+                              int maxNoPackets) = 0;
+
     // Enables capturing of RTP packets to a binary file on a specific
     // |channel| and for a given |direction|. The file can later be replayed
     // using e.g. RTP Tools rtpplay since the binary file format is
diff --git a/webrtc/voice_engine/voe_rtp_rtcp_impl.cc b/webrtc/voice_engine/voe_rtp_rtcp_impl.cc
index b33aa4e14..102e09e3c 100644
--- a/webrtc/voice_engine/voe_rtp_rtcp_impl.cc
+++ b/webrtc/voice_engine/voe_rtp_rtcp_impl.cc
@@ -568,6 +568,19 @@ int VoERTP_RTCPImpl::GetFECStatus(int channel,
 #endif
 }
 
+
+int VoERTP_RTCPImpl::SetNACKStatus(int channel,
+                                   bool enable,
+                                   int maxNoPackets)
+{
+    WEBRTC_TRACE(kTraceApiCall, kTraceVoice, VoEId(_shared->instance_id(), -1),
+                 "SetNACKStatus(channel=%d, enable=%d, maxNoPackets=%d)",
+                 channel, enable, maxNoPackets);
+    // Dummy for now
+    return 0;
+}
+
+
 int VoERTP_RTCPImpl::StartRTPDump(int channel,
                                   const char fileNameUTF8[1024],
                                   RTPDirections direction)
diff --git a/webrtc/voice_engine/voe_rtp_rtcp_impl.h b/webrtc/voice_engine/voe_rtp_rtcp_impl.h
index a9e66fd32..0f8d08481 100644
--- a/webrtc/voice_engine/voe_rtp_rtcp_impl.h
+++ b/webrtc/voice_engine/voe_rtp_rtcp_impl.h
@@ -94,6 +94,11 @@ public:
 
     virtual int GetFECStatus(int channel, bool& enabled, int& redPayloadtype);
 
+    //NACK
+    virtual int SetNACKStatus(int channel,
+                              bool enable,
+                              int maxNoPackets);
+
     // Store RTP and RTCP packets and dump to file (compatible with rtpplay)
     virtual int StartRTPDump(int channel,
                              const char fileNameUTF8[1024],