diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index 3511b8ffed..573e7af58a 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -1018,28 +1018,32 @@ if (rtc_include_tests) {
       visibility += webrtc_default_visibility
       defines = audio_codec_defines
       deps = [
+        ":neteq",
         ":neteq_input_audio_tools",
+        ":neteq_test_tools",
         ":neteq_tools",
         ":neteq_tools_minimal",
+        "../../api:make_ref_counted",
+        "../../api:rtp_headers",
+        "../../api:scoped_refptr",
+        "../../api/audio_codecs:audio_codecs_api",
+        "../../api/audio_codecs:builtin_audio_decoder_factory",
+        "../../api/environment:environment",
+        "../../api/neteq:neteq_api",
+        "../../logging:rtc_event_log_parser",
         "../../rtc_base:checks",
         "../../rtc_base:refcount",
+        "../../test:audio_test_common",
+        "../../test:field_trial",
         "../../test:fileutils",
+        "../../test:test_support",
+        "../rtp_rtcp:rtp_rtcp_format",
         "//third_party/abseil-cpp/absl/strings:string_view",
       ]
       sources = [
         "neteq/tools/neteq_test_factory.cc",
         "neteq/tools/neteq_test_factory.h",
       ]
-
-      deps += [
-        ":neteq",
-        ":neteq_test_tools",
-        "../../api/audio_codecs:builtin_audio_decoder_factory",
-        "../../api/neteq:neteq_api",
-        "../../test:audio_test_common",
-        "../../test:field_trial",
-        "../../test:test_support",
-      ]
     }
   }
 
@@ -1052,6 +1056,7 @@ if (rtc_include_tests) {
         ":neteq_test_factory",
         ":neteq_test_tools",
         ":neteq_tools_minimal",
+        "../../rtc_base:checks",
         "../../rtc_base:stringutils",
         "../../system_wrappers:field_trial",
         "../../test:field_trial",
diff --git a/modules/audio_coding/neteq/tools/neteq_rtpplay.cc b/modules/audio_coding/neteq/tools/neteq_rtpplay.cc
index a4a8ef1bbe..eb7075737b 100644
--- a/modules/audio_coding/neteq/tools/neteq_rtpplay.cc
+++ b/modules/audio_coding/neteq/tools/neteq_rtpplay.cc
@@ -8,18 +8,26 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <cerrno>
+#include <climits>
+#include <cstddef>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
 #include <iostream>
+#include <memory>
 #include <optional>
 #include <string>
+#include <vector>
 
 #include "absl/flags/flag.h"
 #include "absl/flags/parse.h"
 #include "absl/strings/string_view.h"
 #include "modules/audio_coding/neteq/tools/neteq_test.h"
 #include "modules/audio_coding/neteq/tools/neteq_test_factory.h"
+#include "rtc_base/checks.h"
 #include "rtc_base/strings/string_builder.h"
 #include "system_wrappers/include/field_trial.h"
-#include "test/field_trial.h"
 
 using TestConfig = webrtc::test::NetEqTestFactory::Config;
 
@@ -78,7 +86,11 @@ ABSL_FLAG(int,
 ABSL_FLAG(int,
           red,
           TestConfig::default_red(),
-          "RTP payload type for redundant audio (RED)");
+          "RTP payload type for redundant audio (RED, 8kHz)");
+ABSL_FLAG(int,
+          opus_red,
+          TestConfig::default_opus_red(),
+          "RTP payload type for redundant audio (RED, 48kHz)");
 ABSL_FLAG(int,
           cn_nb,
           TestConfig::default_cn_nb(),
@@ -225,7 +237,10 @@ void PrintCodecMapping() {
   PrintCodecMappingEntry("AVT/DTMF (16 kHz)", absl::GetFlag(FLAGS_avt_16));
   PrintCodecMappingEntry("AVT/DTMF (32 kHz)", absl::GetFlag(FLAGS_avt_32));
   PrintCodecMappingEntry("AVT/DTMF (48 kHz)", absl::GetFlag(FLAGS_avt_48));
-  PrintCodecMappingEntry("redundant audio (RED)", absl::GetFlag(FLAGS_red));
+  PrintCodecMappingEntry("redundant audio (RED 8khz)",
+                         absl::GetFlag(FLAGS_red));
+  PrintCodecMappingEntry("redundant audio (RED 48khz)",
+                         absl::GetFlag(FLAGS_opus_red));
   PrintCodecMappingEntry("comfort noise (8 kHz)", absl::GetFlag(FLAGS_cn_nb));
   PrintCodecMappingEntry("comfort noise (16 kHz)", absl::GetFlag(FLAGS_cn_wb));
   PrintCodecMappingEntry("comfort noise (32 kHz)",
@@ -325,6 +340,7 @@ int main(int argc, char* argv[]) {
   RTC_CHECK(ValidatePayloadType(absl::GetFlag(FLAGS_avt_32)));
   RTC_CHECK(ValidatePayloadType(absl::GetFlag(FLAGS_avt_48)));
   RTC_CHECK(ValidatePayloadType(absl::GetFlag(FLAGS_red)));
+  RTC_CHECK(ValidatePayloadType(absl::GetFlag(FLAGS_opus_red)));
   RTC_CHECK(ValidatePayloadType(absl::GetFlag(FLAGS_cn_nb)));
   RTC_CHECK(ValidatePayloadType(absl::GetFlag(FLAGS_cn_wb)));
   RTC_CHECK(ValidatePayloadType(absl::GetFlag(FLAGS_cn_swb32)));
@@ -358,6 +374,7 @@ int main(int argc, char* argv[]) {
   config.avt_32 = absl::GetFlag(FLAGS_avt_32);
   config.avt_48 = absl::GetFlag(FLAGS_avt_48);
   config.red = absl::GetFlag(FLAGS_red);
+  config.opus_red = absl::GetFlag(FLAGS_opus_red);
   config.cn_nb = absl::GetFlag(FLAGS_cn_nb);
   config.cn_wb = absl::GetFlag(FLAGS_cn_wb);
   config.cn_swb32 = absl::GetFlag(FLAGS_cn_swb32);
diff --git a/modules/audio_coding/neteq/tools/neteq_test_factory.cc b/modules/audio_coding/neteq/tools/neteq_test_factory.cc
index 909a5351e4..969590924a 100644
--- a/modules/audio_coding/neteq/tools/neteq_test_factory.cc
+++ b/modules/audio_coding/neteq/tools/neteq_test_factory.cc
@@ -10,27 +10,39 @@
 
 #include "modules/audio_coding/neteq/tools/neteq_test_factory.h"
 
-#include <errno.h>
 #include <limits.h>  // For ULONG_MAX returned by strtoul.
 #include <stdio.h>
 #include <stdlib.h>  // For strtoul.
 
+#include <cstdint>
 #include <fstream>
 #include <iostream>
+#include <map>
 #include <memory>
+#include <optional>
 #include <set>
 #include <string>
 #include <utility>
 
 #include "absl/strings/string_view.h"
+#include "api/audio_codecs/audio_codec_pair_id.h"
+#include "api/audio_codecs/audio_decoder.h"
+#include "api/audio_codecs/audio_decoder_factory.h"
+#include "api/audio_codecs/audio_format.h"
 #include "api/audio_codecs/builtin_audio_decoder_factory.h"
+#include "api/environment/environment.h"
+#include "api/make_ref_counted.h"
 #include "api/neteq/neteq.h"
+#include "api/neteq/neteq_factory.h"
+#include "api/rtp_headers.h"
+#include "api/scoped_refptr.h"
+#include "logging/rtc_event_log/rtc_event_log_parser.h"
 #include "modules/audio_coding/neteq/tools/audio_sink.h"
 #include "modules/audio_coding/neteq/tools/fake_decode_from_file.h"
 #include "modules/audio_coding/neteq/tools/initial_packet_inserter_neteq_input.h"
 #include "modules/audio_coding/neteq/tools/input_audio_file.h"
-#include "modules/audio_coding/neteq/tools/neteq_delay_analyzer.h"
 #include "modules/audio_coding/neteq/tools/neteq_event_log_input.h"
+#include "modules/audio_coding/neteq/tools/neteq_input.h"
 #include "modules/audio_coding/neteq/tools/neteq_replacement_input.h"
 #include "modules/audio_coding/neteq/tools/neteq_rtp_dump_input.h"
 #include "modules/audio_coding/neteq/tools/neteq_stats_getter.h"
@@ -39,6 +51,7 @@
 #include "modules/audio_coding/neteq/tools/output_audio_file.h"
 #include "modules/audio_coding/neteq/tools/output_wav_file.h"
 #include "modules/audio_coding/neteq/tools/rtp_file_source.h"
+#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "rtc_base/checks.h"
 #include "test/function_audio_decoder_factory.h"
 #include "test/testsupport/file_utils.h"
@@ -62,7 +75,8 @@ std::optional<int> CodecSampleRate(
       payload_type == config.cn_swb32 || payload_type == config.avt_32)
     return 32000;
   if (payload_type == config.opus || payload_type == config.pcm16b_swb48 ||
-      payload_type == config.cn_swb48 || payload_type == config.avt_48)
+      payload_type == config.cn_swb48 || payload_type == config.avt_48 ||
+      payload_type == config.opus_red)
     return 48000;
   if (payload_type == config.red)
     return 0;
@@ -284,9 +298,9 @@ std::unique_ptr<NetEqTest> NetEqTestFactory::InitializeTest(
 
     std::set<uint8_t> cn_types = std_set_int32_to_uint8(
         {config.cn_nb, config.cn_wb, config.cn_swb32, config.cn_swb48});
-    std::set<uint8_t> forbidden_types =
-        std_set_int32_to_uint8({config.g722, config.red, config.avt,
-                                config.avt_16, config.avt_32, config.avt_48});
+    std::set<uint8_t> forbidden_types = std_set_int32_to_uint8(
+        {config.g722, config.red, config.opus_red, config.avt, config.avt_16,
+         config.avt_32, config.avt_48});
     input.reset(new NetEqReplacementInput(std::move(input), replacement_pt,
                                           cn_types, forbidden_types));
 
diff --git a/modules/audio_coding/neteq/tools/neteq_test_factory.h b/modules/audio_coding/neteq/tools/neteq_test_factory.h
index f991591c10..c7564fa718 100644
--- a/modules/audio_coding/neteq/tools/neteq_test_factory.h
+++ b/modules/audio_coding/neteq/tools/neteq_test_factory.h
@@ -11,11 +11,14 @@
 #ifndef MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_TEST_FACTORY_H_
 #define MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_TEST_FACTORY_H_
 
+#include <cstdint>
 #include <memory>
 #include <optional>
 #include <string>
 
 #include "absl/strings/string_view.h"
+#include "api/neteq/neteq_factory.h"
+#include "modules/audio_coding/neteq/tools/neteq_input.h"
 #include "modules/audio_coding/neteq/tools/neteq_test.h"
 
 namespace webrtc {
@@ -80,6 +83,9 @@ class NetEqTestFactory {
     // RTP payload type for redundant audio (RED).
     static constexpr int default_red() { return 117; }
     int red = default_red();
+
+    static constexpr int default_opus_red() { return 63; }
+    int opus_red = default_opus_red();
     // RTP payload type for comfort noise (8 kHz).
     static constexpr int default_cn_nb() { return 13; }
     int cn_nb = default_cn_nb();