diff --git a/call/audio_receive_stream.h b/call/audio_receive_stream.h
index 182cd49..1c2d11b 100644
--- a/call/audio_receive_stream.h
+++ b/call/audio_receive_stream.h
@@ -96,6 +96,9 @@
     uint32_t sender_reports_packets_sent = 0;
     uint64_t sender_reports_bytes_sent = 0;
     uint64_t sender_reports_reports_count = 0;
+    absl::optional<TimeDelta> round_trip_time;
+    TimeDelta total_round_trip_time = TimeDelta::Zero();
+    int round_trip_time_measurements;
   };
 
   struct Config {
@@ -115,6 +118,9 @@
       NackConfig nack;
     } rtp;
 
+    // Receive-side RTT.
+    bool enable_non_sender_rtt = false;
+
     Transport* rtcp_send_transport = nullptr;
 
     // NetEq settings.
@@ -158,6 +164,8 @@
   virtual void SetDecoderMap(std::map<int, SdpAudioFormat> decoder_map) = 0;
   virtual void SetUseTransportCcAndNackHistory(bool use_transport_cc,
                                                int history_ms) = 0;
+  virtual void SetNonSenderRttMeasurement(bool enabled) = 0;
+
   // Set/change the rtp header extensions. Must be called on the packet
   // delivery thread.
   virtual void SetRtpExtensions(std::vector<RtpExtension> extensions) = 0;