diff --git a/modules/audio_coding/acm2/audio_coding_module.cc b/modules/audio_coding/acm2/audio_coding_module.cc
index 60e4fe1a91..6c0e31edc2 100644
--- a/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/modules/audio_coding/acm2/audio_coding_module.cc
@@ -118,14 +118,6 @@ class AudioCodingModuleImpl final : public AudioCodingModule {
 
   int GetNetworkStatistics(NetworkStatistics* statistics) override;
 
-  // If current send codec is Opus, informs it about the maximum playback rate
-  // the receiver will render.
-  int SetOpusMaxPlaybackRate(int frequency_hz) override;
-
-  int EnableOpusDtx() override;
-
-  int DisableOpusDtx() override;
-
   int EnableNack(size_t max_nack_list_size) override;
 
   void DisableNack() override;
@@ -710,32 +702,6 @@ int AudioCodingModuleImpl::RegisterVADCallback(ACMVADCallback* vad_callback) {
   return 0;
 }
 
-// Informs Opus encoder of the maximum playback rate the receiver will render.
-int AudioCodingModuleImpl::SetOpusMaxPlaybackRate(int frequency_hz) {
-  rtc::CritScope lock(&acm_crit_sect_);
-  if (!HaveValidEncoder("SetOpusMaxPlaybackRate")) {
-    return -1;
-  }
-  encoder_stack_->SetMaxPlaybackRate(frequency_hz);
-  return 0;
-}
-
-int AudioCodingModuleImpl::EnableOpusDtx() {
-  rtc::CritScope lock(&acm_crit_sect_);
-  if (!HaveValidEncoder("EnableOpusDtx")) {
-    return -1;
-  }
-  return encoder_stack_->SetDtx(true) ? 0 : -1;
-}
-
-int AudioCodingModuleImpl::DisableOpusDtx() {
-  rtc::CritScope lock(&acm_crit_sect_);
-  if (!HaveValidEncoder("DisableOpusDtx")) {
-    return -1;
-  }
-  return encoder_stack_->SetDtx(false) ? 0 : -1;
-}
-
 absl::optional<uint32_t> AudioCodingModuleImpl::PlayoutTimestamp() {
   return receiver_.GetPlayoutTimestamp();
 }
diff --git a/modules/audio_coding/include/audio_coding_module.h b/modules/audio_coding/include/audio_coding_module.h
index 0279ffcbcd..8d0e9eee38 100644
--- a/modules/audio_coding/include/audio_coding_module.h
+++ b/modules/audio_coding/include/audio_coding_module.h
@@ -322,47 +322,6 @@ class AudioCodingModule {
                                   AudioFrame* audio_frame,
                                   bool* muted) = 0;
 
-  ///////////////////////////////////////////////////////////////////////////
-  //   Codec specific
-  //
-
-  ///////////////////////////////////////////////////////////////////////////
-  // int SetOpusMaxPlaybackRate()
-  // If current send codec is Opus, informs it about maximum playback rate the
-  // receiver will render. Opus can use this information to optimize the bit
-  // rate and increase the computation efficiency.
-  //
-  // Input:
-  //   -frequency_hz            : maximum playback rate in Hz.
-  //
-  // Return value:
-  //   -1 if current send codec is not Opus or
-  //      error occurred in setting the maximum playback rate,
-  //    0 if maximum bandwidth is set successfully.
-  //
-  virtual int SetOpusMaxPlaybackRate(int frequency_hz) = 0;
-
-  ///////////////////////////////////////////////////////////////////////////
-  // EnableOpusDtx()
-  // Enable the DTX, if current send codec is Opus.
-  //
-  // Return value:
-  //   -1 if current send codec is not Opus or error occurred in enabling the
-  //      Opus DTX.
-  //    0 if Opus DTX is enabled successfully.
-  //
-  virtual int EnableOpusDtx() = 0;
-
-  ///////////////////////////////////////////////////////////////////////////
-  // int DisableOpusDtx()
-  // If current send codec is Opus, disables its internal DTX.
-  //
-  // Return value:
-  //   -1 if current send codec is not Opus or error occurred in disabling DTX.
-  //    0 if Opus DTX is disabled successfully.
-  //
-  virtual int DisableOpusDtx() = 0;
-
   ///////////////////////////////////////////////////////////////////////////
   //   statistics
   //
diff --git a/modules/audio_coding/test/TestVADDTX.cc b/modules/audio_coding/test/TestVADDTX.cc
index 254c7d4204..52b7fc394f 100644
--- a/modules/audio_coding/test/TestVADDTX.cc
+++ b/modules/audio_coding/test/TestVADDTX.cc
@@ -209,23 +209,22 @@ void TestWebRtcVadDtx::Test(bool new_outfile, bool expect_dtx_enabled) {
 
 // Following is the implementation of TestOpusDtx.
 void TestOpusDtx::Perform() {
-  // If we set other codec than Opus, DTX cannot be switched on.
-  RegisterCodec({"ISAC", 16000, 1}, absl::nullopt);
-  EXPECT_EQ(-1, acm_send_->EnableOpusDtx());
-  EXPECT_EQ(0, acm_send_->DisableOpusDtx());
-
   int expects[] = {0, 1, 0, 0, 0};
 
   // Register Opus as send codec
   std::string out_filename =
       webrtc::test::OutputPath() + "testOpusDtx_outFile_mono.pcm";
   RegisterCodec({"opus", 48000, 2}, absl::nullopt);
-  EXPECT_EQ(0, acm_send_->DisableOpusDtx());
+  acm_send_->ModifyEncoder([](std::unique_ptr<AudioEncoder>* encoder_ptr) {
+    (*encoder_ptr)->SetDtx(false);
+  });
 
   Run(webrtc::test::ResourcePath("audio_coding/testfile32kHz", "pcm"), 32000, 1,
       out_filename, false, expects);
 
-  EXPECT_EQ(0, acm_send_->EnableOpusDtx());
+  acm_send_->ModifyEncoder([](std::unique_ptr<AudioEncoder>* encoder_ptr) {
+    (*encoder_ptr)->SetDtx(true);
+  });
   expects[static_cast<int>(AudioFrameType::kEmptyFrame)] = 1;
   expects[static_cast<int>(AudioFrameType::kAudioFrameCN)] = 1;
   Run(webrtc::test::ResourcePath("audio_coding/testfile32kHz", "pcm"), 32000, 1,
@@ -234,13 +233,17 @@ void TestOpusDtx::Perform() {
   // Register stereo Opus as send codec
   out_filename = webrtc::test::OutputPath() + "testOpusDtx_outFile_stereo.pcm";
   RegisterCodec({"opus", 48000, 2, {{"stereo", "1"}}}, absl::nullopt);
-  EXPECT_EQ(0, acm_send_->DisableOpusDtx());
+  acm_send_->ModifyEncoder([](std::unique_ptr<AudioEncoder>* encoder_ptr) {
+    (*encoder_ptr)->SetDtx(false);
+  });
   expects[static_cast<int>(AudioFrameType::kEmptyFrame)] = 0;
   expects[static_cast<int>(AudioFrameType::kAudioFrameCN)] = 0;
   Run(webrtc::test::ResourcePath("audio_coding/teststereo32kHz", "pcm"), 32000,
       2, out_filename, false, expects);
 
-  EXPECT_EQ(0, acm_send_->EnableOpusDtx());
+  acm_send_->ModifyEncoder([](std::unique_ptr<AudioEncoder>* encoder_ptr) {
+    (*encoder_ptr)->SetDtx(true);
+  });
 
   expects[static_cast<int>(AudioFrameType::kEmptyFrame)] = 1;
   expects[static_cast<int>(AudioFrameType::kAudioFrameCN)] = 1;