diff --git a/modules/rtp_rtcp/source/rtp_header_extensions.h b/modules/rtp_rtcp/source/rtp_header_extensions.h
index 9f4a28b..e37388a 100644
--- a/modules/rtp_rtcp/source/rtp_header_extensions.h
+++ b/modules/rtp_rtcp/source/rtp_header_extensions.h
@@ -81,9 +81,38 @@
   static constexpr const char kUri[] =
       "http://www.ietf.org/id/"
       "draft-holmer-rmcat-transport-wide-cc-extensions-01";
-  static bool Parse(rtc::ArrayView<const uint8_t> data, uint16_t* value);
-  static size_t ValueSize(uint16_t value) { return kValueSizeBytes; }
-  static bool Write(rtc::ArrayView<uint8_t> data, uint16_t value);
+  static bool Parse(rtc::ArrayView<const uint8_t> data,
+                    uint16_t* transport_sequence_number);
+  static size_t ValueSize(uint16_t /*transport_sequence_number*/) {
+    return kValueSizeBytes;
+  }
+  static bool Write(rtc::ArrayView<uint8_t> data,
+                    uint16_t transport_sequence_number);
+};
+
+class TransportSequenceNumberV2 {
+ public:
+  static constexpr RTPExtensionType kId =
+      kRtpExtensionTransportSequenceNumber02;
+  static constexpr uint8_t kValueSizeBytesWithFeedbackRequest = 4;
+  static constexpr const char kUri[] =
+      "http://www.ietf.org/id/"
+      "draft-holmer-rmcat-transport-wide-cc-extensions-02";
+  static bool Parse(rtc::ArrayView<const uint8_t> data,
+                    uint16_t* transport_sequence_number,
+                    absl::optional<FeedbackRequest>* feedback_request);
+  static size_t ValueSize(
+      uint16_t /*transport_sequence_number*/,
+      const absl::optional<FeedbackRequest>& feedback_request) {
+    return feedback_request ? kValueSizeBytesWithFeedbackRequest
+                            : TransportSequenceNumber::kValueSizeBytes;
+  }
+  static bool Write(rtc::ArrayView<uint8_t> data,
+                    uint16_t transport_sequence_number,
+                    const absl::optional<FeedbackRequest>& feedback_request);
+
+ private:
+  static constexpr uint16_t kIncludeTimestampsBit = 1 << 15;
 };
 
 class VideoOrientation {