diff --git a/api/BUILD.gn b/api/BUILD.gn
index f02b34cc39..c270aadd28 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -546,6 +546,7 @@ rtc_library("rtp_parameters") {
     "video:resolution",
     "video_codecs:scalability_mode",
     "//third_party/abseil-cpp/absl/container:inlined_vector",
+    "//third_party/abseil-cpp/absl/strings:str_format",
     "//third_party/abseil-cpp/absl/strings:string_view",
   ]
 }
diff --git a/api/DEPS b/api/DEPS
index e4c17a3a39..69b9f97864 100644
--- a/api/DEPS
+++ b/api/DEPS
@@ -198,6 +198,10 @@ specific_include_rules = {
     "+modules/video_coding/include/video_codec_interface.h"
   ],
 
+  "rtp_parameters\.h": [
+    "+absl/strings/str_format.h",
+  ],
+
   "sequence_checker\.h": [
     "+rtc_base/synchronization/sequence_checker_internal.h",
     "+rtc_base/thread_annotations.h",
diff --git a/api/rtp_parameters.h b/api/rtp_parameters.h
index c32222ff18..f19f5fc05b 100644
--- a/api/rtp_parameters.h
+++ b/api/rtp_parameters.h
@@ -19,6 +19,7 @@
 #include <vector>
 
 #include "absl/container/inlined_vector.h"
+#include "absl/strings/str_format.h"
 #include "absl/strings/string_view.h"
 #include "api/media_types.h"
 #include "api/priority.h"
@@ -395,6 +396,15 @@ struct RTC_EXPORT RtpExtension {
   std::string uri;
   int id = 0;
   bool encrypt = false;
+
+  template <typename Sink>
+  friend void AbslStringify(Sink& sink, const RtpExtension& extension) {
+    if (extension.encrypt) {
+      absl::Format(&sink, "[%d %s (encrypted)]", extension.id, extension.uri);
+    } else {
+      absl::Format(&sink, "[%d %s]", extension.id, extension.uri);
+    }
+  }
 };
 
 struct RTC_EXPORT RtpFecParameters {