From 841930a680ebe370c9fc6ae824465f6bc51a5a46 Mon Sep 17 00:00:00 2001
From: yoshi-automation <yoshi-automation@google.com>
Date: Tue, 30 Apr 2019 00:42:19 -0700
Subject: [PATCH] Regenerate dialogflow client

---
 .../cloud/dialogflow/v2/AudioConfigProto.java |  84 ++++---
 .../cloud/dialogflow/v2/AudioEncoding.java    |   4 +-
 .../cloud/dialogflow/v2/InputAudioConfig.java | 147 +++++++++++-
 .../v2/InputAudioConfigOrBuilder.java         |  23 +-
 .../dialogflow/v2/OutputAudioConfig.java      |   4 +-
 .../dialogflow/v2/OutputAudioEncoding.java    |   2 +-
 .../cloud/dialogflow/v2/SessionProto.java     |  62 ++---
 .../dialogflow/v2/SpeechModelVariant.java     | 214 +++++++++++++++++
 .../cloud/dialogflow/v2/SsmlVoiceGender.java  |   2 +-
 .../cloud/dialogflow/v2/audio_config.proto    | 125 +++++++++-
 .../google/cloud/dialogflow/v2/session.proto  |  77 -------
 .../dialogflow/v2beta1/AudioConfigProto.java  |  78 ++++---
 .../dialogflow/v2beta1/InputAudioConfig.java  | 141 +++++++++++-
 .../v2beta1/InputAudioConfigOrBuilder.java    |  21 ++
 .../v2beta1/OutputAudioEncoding.java          |   2 +-
 .../v2beta1/SpeechModelVariant.java           | 216 ++++++++++++++++++
 .../dialogflow/v2beta1/SsmlVoiceGender.java   |   2 +-
 .../dialogflow/v2beta1/audio_config.proto     |  48 +++-
 .../google-cloud-dialogflow/synth.metadata    |  10 +-
 19 files changed, 1057 insertions(+), 205 deletions(-)
 create mode 100644 google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SpeechModelVariant.java
 create mode 100644 google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SpeechModelVariant.java

diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioConfigProto.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioConfigProto.java
index aad2a2d27800..93097710b5d7 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioConfigProto.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioConfigProto.java
@@ -12,6 +12,10 @@ public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry r
     registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
   }
 
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_v2_InputAudioConfig_fieldAccessorTable;
   static final com.google.protobuf.Descriptors.Descriptor
       internal_static_google_cloud_dialogflow_v2_VoiceSelectionParams_descriptor;
   static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
@@ -35,31 +39,47 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
     java.lang.String[] descriptorData = {
       "\n-google/cloud/dialogflow/v2/audio_confi"
           + "g.proto\022\032google.cloud.dialogflow.v2\032\034goo"
-          + "gle/api/annotations.proto\"f\n\024VoiceSelect"
-          + "ionParams\022\014\n\004name\030\001 \001(\t\022@\n\013ssml_gender\030\002"
-          + " \001(\0162+.google.cloud.dialogflow.v2.SsmlVo"
-          + "iceGender\"\263\001\n\026SynthesizeSpeechConfig\022\025\n\r"
-          + "speaking_rate\030\001 \001(\001\022\r\n\005pitch\030\002 \001(\001\022\026\n\016vo"
-          + "lume_gain_db\030\003 \001(\001\022\032\n\022effects_profile_id"
-          + "\030\005 \003(\t\022?\n\005voice\030\004 \001(\01320.google.cloud.dia"
-          + "logflow.v2.VoiceSelectionParams\"\315\001\n\021Outp"
-          + "utAudioConfig\022G\n\016audio_encoding\030\001 \001(\0162/."
-          + "google.cloud.dialogflow.v2.OutputAudioEn"
-          + "coding\022\031\n\021sample_rate_hertz\030\002 \001(\005\022T\n\030syn"
-          + "thesize_speech_config\030\003 \001(\01322.google.clo"
-          + "ud.dialogflow.v2.SynthesizeSpeechConfig*"
-          + "\215\001\n\017SsmlVoiceGender\022!\n\035SSML_VOICE_GENDER"
-          + "_UNSPECIFIED\020\000\022\032\n\026SSML_VOICE_GENDER_MALE"
-          + "\020\001\022\034\n\030SSML_VOICE_GENDER_FEMALE\020\002\022\035\n\031SSML"
-          + "_VOICE_GENDER_NEUTRAL\020\003*\244\001\n\023OutputAudioE"
-          + "ncoding\022%\n!OUTPUT_AUDIO_ENCODING_UNSPECI"
-          + "FIED\020\000\022#\n\037OUTPUT_AUDIO_ENCODING_LINEAR_1"
-          + "6\020\001\022\035\n\031OUTPUT_AUDIO_ENCODING_MP3\020\002\022\"\n\036OU"
-          + "TPUT_AUDIO_ENCODING_OGG_OPUS\020\003B\237\001\n\036com.g"
-          + "oogle.cloud.dialogflow.v2B\020AudioConfigPr"
-          + "otoP\001ZDgoogle.golang.org/genproto/google"
-          + "apis/cloud/dialogflow/v2;dialogflow\370\001\001\242\002"
-          + "\002DF\252\002\032Google.Cloud.Dialogflow.V2b\006proto3"
+          + "gle/api/annotations.proto\"\344\001\n\020InputAudio"
+          + "Config\022A\n\016audio_encoding\030\001 \001(\0162).google."
+          + "cloud.dialogflow.v2.AudioEncoding\022\031\n\021sam"
+          + "ple_rate_hertz\030\002 \001(\005\022\025\n\rlanguage_code\030\003 "
+          + "\001(\t\022\024\n\014phrase_hints\030\004 \003(\t\022E\n\rmodel_varia"
+          + "nt\030\n \001(\0162..google.cloud.dialogflow.v2.Sp"
+          + "eechModelVariant\"f\n\024VoiceSelectionParams"
+          + "\022\014\n\004name\030\001 \001(\t\022@\n\013ssml_gender\030\002 \001(\0162+.go"
+          + "ogle.cloud.dialogflow.v2.SsmlVoiceGender"
+          + "\"\263\001\n\026SynthesizeSpeechConfig\022\025\n\rspeaking_"
+          + "rate\030\001 \001(\001\022\r\n\005pitch\030\002 \001(\001\022\026\n\016volume_gain"
+          + "_db\030\003 \001(\001\022\032\n\022effects_profile_id\030\005 \003(\t\022?\n"
+          + "\005voice\030\004 \001(\01320.google.cloud.dialogflow.v"
+          + "2.VoiceSelectionParams\"\315\001\n\021OutputAudioCo"
+          + "nfig\022G\n\016audio_encoding\030\001 \001(\0162/.google.cl"
+          + "oud.dialogflow.v2.OutputAudioEncoding\022\031\n"
+          + "\021sample_rate_hertz\030\002 \001(\005\022T\n\030synthesize_s"
+          + "peech_config\030\003 \001(\01322.google.cloud.dialog"
+          + "flow.v2.SynthesizeSpeechConfig*\373\001\n\rAudio"
+          + "Encoding\022\036\n\032AUDIO_ENCODING_UNSPECIFIED\020\000"
+          + "\022\034\n\030AUDIO_ENCODING_LINEAR_16\020\001\022\027\n\023AUDIO_"
+          + "ENCODING_FLAC\020\002\022\030\n\024AUDIO_ENCODING_MULAW\020"
+          + "\003\022\026\n\022AUDIO_ENCODING_AMR\020\004\022\031\n\025AUDIO_ENCOD"
+          + "ING_AMR_WB\020\005\022\033\n\027AUDIO_ENCODING_OGG_OPUS\020"
+          + "\006\022)\n%AUDIO_ENCODING_SPEEX_WITH_HEADER_BY"
+          + "TE\020\007*v\n\022SpeechModelVariant\022$\n SPEECH_MOD"
+          + "EL_VARIANT_UNSPECIFIED\020\000\022\026\n\022USE_BEST_AVA"
+          + "ILABLE\020\001\022\020\n\014USE_STANDARD\020\002\022\020\n\014USE_ENHANC"
+          + "ED\020\003*\215\001\n\017SsmlVoiceGender\022!\n\035SSML_VOICE_G"
+          + "ENDER_UNSPECIFIED\020\000\022\032\n\026SSML_VOICE_GENDER"
+          + "_MALE\020\001\022\034\n\030SSML_VOICE_GENDER_FEMALE\020\002\022\035\n"
+          + "\031SSML_VOICE_GENDER_NEUTRAL\020\003*\244\001\n\023OutputA"
+          + "udioEncoding\022%\n!OUTPUT_AUDIO_ENCODING_UN"
+          + "SPECIFIED\020\000\022#\n\037OUTPUT_AUDIO_ENCODING_LIN"
+          + "EAR_16\020\001\022\035\n\031OUTPUT_AUDIO_ENCODING_MP3\020\002\022"
+          + "\"\n\036OUTPUT_AUDIO_ENCODING_OGG_OPUS\020\003B\237\001\n\036"
+          + "com.google.cloud.dialogflow.v2B\020AudioCon"
+          + "figProtoP\001ZDgoogle.golang.org/genproto/g"
+          + "oogleapis/cloud/dialogflow/v2;dialogflow"
+          + "\370\001\001\242\002\002DF\252\002\032Google.Cloud.Dialogflow.V2b\006p"
+          + "roto3"
     };
     com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
         new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
@@ -75,8 +95,16 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
           com.google.api.AnnotationsProto.getDescriptor(),
         },
         assigner);
-    internal_static_google_cloud_dialogflow_v2_VoiceSelectionParams_descriptor =
+    internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor =
         getDescriptor().getMessageTypes().get(0);
+    internal_static_google_cloud_dialogflow_v2_InputAudioConfig_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor,
+            new java.lang.String[] {
+              "AudioEncoding", "SampleRateHertz", "LanguageCode", "PhraseHints", "ModelVariant",
+            });
+    internal_static_google_cloud_dialogflow_v2_VoiceSelectionParams_descriptor =
+        getDescriptor().getMessageTypes().get(1);
     internal_static_google_cloud_dialogflow_v2_VoiceSelectionParams_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_VoiceSelectionParams_descriptor,
@@ -84,7 +112,7 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
               "Name", "SsmlGender",
             });
     internal_static_google_cloud_dialogflow_v2_SynthesizeSpeechConfig_descriptor =
-        getDescriptor().getMessageTypes().get(1);
+        getDescriptor().getMessageTypes().get(2);
     internal_static_google_cloud_dialogflow_v2_SynthesizeSpeechConfig_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_SynthesizeSpeechConfig_descriptor,
@@ -92,7 +120,7 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
               "SpeakingRate", "Pitch", "VolumeGainDb", "EffectsProfileId", "Voice",
             });
     internal_static_google_cloud_dialogflow_v2_OutputAudioConfig_descriptor =
-        getDescriptor().getMessageTypes().get(2);
+        getDescriptor().getMessageTypes().get(3);
     internal_static_google_cloud_dialogflow_v2_OutputAudioConfig_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_OutputAudioConfig_descriptor,
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioEncoding.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioEncoding.java
index 29d255466510..abf8ded84550 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioEncoding.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/AudioEncoding.java
@@ -1,5 +1,5 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/cloud/dialogflow/v2/session.proto
+// source: google/cloud/dialogflow/v2/audio_config.proto
 
 package com.google.cloud.dialogflow.v2;
 
@@ -274,7 +274,7 @@ public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType
   }
 
   public static final com.google.protobuf.Descriptors.EnumDescriptor getDescriptor() {
-    return com.google.cloud.dialogflow.v2.SessionProto.getDescriptor().getEnumTypes().get(0);
+    return com.google.cloud.dialogflow.v2.AudioConfigProto.getDescriptor().getEnumTypes().get(0);
   }
 
   private static final AudioEncoding[] VALUES = values();
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfig.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfig.java
index c361c911cb1e..67a572c50889 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfig.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfig.java
@@ -1,5 +1,5 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/cloud/dialogflow/v2/session.proto
+// source: google/cloud/dialogflow/v2/audio_config.proto
 
 package com.google.cloud.dialogflow.v2;
 
@@ -26,6 +26,7 @@ private InputAudioConfig() {
     audioEncoding_ = 0;
     languageCode_ = "";
     phraseHints_ = com.google.protobuf.LazyStringArrayList.EMPTY;
+    modelVariant_ = 0;
   }
 
   @java.lang.Override
@@ -81,6 +82,13 @@ private InputAudioConfig(
               phraseHints_.add(s);
               break;
             }
+          case 80:
+            {
+              int rawValue = input.readEnum();
+
+              modelVariant_ = rawValue;
+              break;
+            }
           default:
             {
               if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
@@ -104,14 +112,14 @@ private InputAudioConfig(
   }
 
   public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
-    return com.google.cloud.dialogflow.v2.SessionProto
+    return com.google.cloud.dialogflow.v2.AudioConfigProto
         .internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor;
   }
 
   @java.lang.Override
   protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
       internalGetFieldAccessorTable() {
-    return com.google.cloud.dialogflow.v2.SessionProto
+    return com.google.cloud.dialogflow.v2.AudioConfigProto
         .internal_static_google_cloud_dialogflow_v2_InputAudioConfig_fieldAccessorTable
         .ensureFieldAccessorsInitialized(
             com.google.cloud.dialogflow.v2.InputAudioConfig.class,
@@ -290,6 +298,36 @@ public com.google.protobuf.ByteString getPhraseHintsBytes(int index) {
     return phraseHints_.getByteString(index);
   }
 
+  public static final int MODEL_VARIANT_FIELD_NUMBER = 10;
+  private int modelVariant_;
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+   */
+  public int getModelVariantValue() {
+    return modelVariant_;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+   */
+  public com.google.cloud.dialogflow.v2.SpeechModelVariant getModelVariant() {
+    @SuppressWarnings("deprecation")
+    com.google.cloud.dialogflow.v2.SpeechModelVariant result =
+        com.google.cloud.dialogflow.v2.SpeechModelVariant.valueOf(modelVariant_);
+    return result == null ? com.google.cloud.dialogflow.v2.SpeechModelVariant.UNRECOGNIZED : result;
+  }
+
   private byte memoizedIsInitialized = -1;
 
   @java.lang.Override
@@ -317,6 +355,11 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < phraseHints_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, phraseHints_.getRaw(i));
     }
+    if (modelVariant_
+        != com.google.cloud.dialogflow.v2.SpeechModelVariant.SPEECH_MODEL_VARIANT_UNSPECIFIED
+            .getNumber()) {
+      output.writeEnum(10, modelVariant_);
+    }
     unknownFields.writeTo(output);
   }
 
@@ -344,6 +387,11 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getPhraseHintsList().size();
     }
+    if (modelVariant_
+        != com.google.cloud.dialogflow.v2.SpeechModelVariant.SPEECH_MODEL_VARIANT_UNSPECIFIED
+            .getNumber()) {
+      size += com.google.protobuf.CodedOutputStream.computeEnumSize(10, modelVariant_);
+    }
     size += unknownFields.getSerializedSize();
     memoizedSize = size;
     return size;
@@ -364,6 +412,7 @@ public boolean equals(final java.lang.Object obj) {
     if (getSampleRateHertz() != other.getSampleRateHertz()) return false;
     if (!getLanguageCode().equals(other.getLanguageCode())) return false;
     if (!getPhraseHintsList().equals(other.getPhraseHintsList())) return false;
+    if (modelVariant_ != other.modelVariant_) return false;
     if (!unknownFields.equals(other.unknownFields)) return false;
     return true;
   }
@@ -385,6 +434,8 @@ public int hashCode() {
       hash = (37 * hash) + PHRASE_HINTS_FIELD_NUMBER;
       hash = (53 * hash) + getPhraseHintsList().hashCode();
     }
+    hash = (37 * hash) + MODEL_VARIANT_FIELD_NUMBER;
+    hash = (53 * hash) + modelVariant_;
     hash = (29 * hash) + unknownFields.hashCode();
     memoizedHashCode = hash;
     return hash;
@@ -499,14 +550,14 @@ public static final class Builder extends com.google.protobuf.GeneratedMessageV3
       // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.v2.InputAudioConfig)
       com.google.cloud.dialogflow.v2.InputAudioConfigOrBuilder {
     public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
-      return com.google.cloud.dialogflow.v2.SessionProto
+      return com.google.cloud.dialogflow.v2.AudioConfigProto
           .internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor;
     }
 
     @java.lang.Override
     protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
         internalGetFieldAccessorTable() {
-      return com.google.cloud.dialogflow.v2.SessionProto
+      return com.google.cloud.dialogflow.v2.AudioConfigProto
           .internal_static_google_cloud_dialogflow_v2_InputAudioConfig_fieldAccessorTable
           .ensureFieldAccessorsInitialized(
               com.google.cloud.dialogflow.v2.InputAudioConfig.class,
@@ -538,12 +589,14 @@ public Builder clear() {
 
       phraseHints_ = com.google.protobuf.LazyStringArrayList.EMPTY;
       bitField0_ = (bitField0_ & ~0x00000008);
+      modelVariant_ = 0;
+
       return this;
     }
 
     @java.lang.Override
     public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
-      return com.google.cloud.dialogflow.v2.SessionProto
+      return com.google.cloud.dialogflow.v2.AudioConfigProto
           .internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor;
     }
 
@@ -575,6 +628,7 @@ public com.google.cloud.dialogflow.v2.InputAudioConfig buildPartial() {
         bitField0_ = (bitField0_ & ~0x00000008);
       }
       result.phraseHints_ = phraseHints_;
+      result.modelVariant_ = modelVariant_;
       result.bitField0_ = to_bitField0_;
       onBuilt();
       return result;
@@ -646,6 +700,9 @@ public Builder mergeFrom(com.google.cloud.dialogflow.v2.InputAudioConfig other)
         }
         onChanged();
       }
+      if (other.modelVariant_ != 0) {
+        setModelVariantValue(other.getModelVariantValue());
+      }
       this.mergeUnknownFields(other.unknownFields);
       onChanged();
       return this;
@@ -1111,6 +1168,84 @@ public Builder addPhraseHintsBytes(com.google.protobuf.ByteString value) {
       return this;
     }
 
+    private int modelVariant_ = 0;
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+     */
+    public int getModelVariantValue() {
+      return modelVariant_;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+     */
+    public Builder setModelVariantValue(int value) {
+      modelVariant_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+     */
+    public com.google.cloud.dialogflow.v2.SpeechModelVariant getModelVariant() {
+      @SuppressWarnings("deprecation")
+      com.google.cloud.dialogflow.v2.SpeechModelVariant result =
+          com.google.cloud.dialogflow.v2.SpeechModelVariant.valueOf(modelVariant_);
+      return result == null
+          ? com.google.cloud.dialogflow.v2.SpeechModelVariant.UNRECOGNIZED
+          : result;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+     */
+    public Builder setModelVariant(com.google.cloud.dialogflow.v2.SpeechModelVariant value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      modelVariant_ = value.getNumber();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+     */
+    public Builder clearModelVariant() {
+
+      modelVariant_ = 0;
+      onChanged();
+      return this;
+    }
+
     @java.lang.Override
     public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
       return super.setUnknownFields(unknownFields);
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfigOrBuilder.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfigOrBuilder.java
index f1b0da5bf5fc..c8d0655150a7 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfigOrBuilder.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/InputAudioConfigOrBuilder.java
@@ -1,5 +1,5 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/cloud/dialogflow/v2/session.proto
+// source: google/cloud/dialogflow/v2/audio_config.proto
 
 package com.google.cloud.dialogflow.v2;
 
@@ -133,4 +133,25 @@ public interface InputAudioConfigOrBuilder
    * <code>repeated string phrase_hints = 4;</code>
    */
   com.google.protobuf.ByteString getPhraseHintsBytes(int index);
+
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+   */
+  int getModelVariantValue();
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2.SpeechModelVariant model_variant = 10;</code>
+   */
+  com.google.cloud.dialogflow.v2.SpeechModelVariant getModelVariant();
 }
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioConfig.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioConfig.java
index 3f0a1b4890e2..16b8c21fa7d7 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioConfig.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioConfig.java
@@ -7,7 +7,7 @@
  *
  *
  * <pre>
- * Instructs the speech synthesizer how to generate the output audio content.
+ * Instructs the speech synthesizer on how to generate the output audio content.
  * </pre>
  *
  * Protobuf type {@code google.cloud.dialogflow.v2.OutputAudioConfig}
@@ -397,7 +397,7 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    *
    *
    * <pre>
-   * Instructs the speech synthesizer how to generate the output audio content.
+   * Instructs the speech synthesizer on how to generate the output audio content.
    * </pre>
    *
    * Protobuf type {@code google.cloud.dialogflow.v2.OutputAudioConfig}
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioEncoding.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioEncoding.java
index c03b8e0ba80e..16c0392a621b 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioEncoding.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/OutputAudioEncoding.java
@@ -156,7 +156,7 @@ public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType
   }
 
   public static final com.google.protobuf.Descriptors.EnumDescriptor getDescriptor() {
-    return com.google.cloud.dialogflow.v2.AudioConfigProto.getDescriptor().getEnumTypes().get(1);
+    return com.google.cloud.dialogflow.v2.AudioConfigProto.getDescriptor().getEnumTypes().get(3);
   }
 
   private static final OutputAudioEncoding[] VALUES = values();
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SessionProto.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SessionProto.java
index b93b98ec2e0b..c579791b0940 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SessionProto.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SessionProto.java
@@ -44,10 +44,6 @@ public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry r
       internal_static_google_cloud_dialogflow_v2_StreamingRecognitionResult_descriptor;
   static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
       internal_static_google_cloud_dialogflow_v2_StreamingRecognitionResult_fieldAccessorTable;
-  static final com.google.protobuf.Descriptors.Descriptor
-      internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor;
-  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
-      internal_static_google_cloud_dialogflow_v2_InputAudioConfig_fieldAccessorTable;
   static final com.google.protobuf.Descriptors.Descriptor
       internal_static_google_cloud_dialogflow_v2_TextInput_descriptor;
   static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
@@ -153,11 +149,7 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
           + "ype\022\022\n\ntranscript\030\002 \001(\t\022\020\n\010is_final\030\003 \001("
           + "\010\022\022\n\nconfidence\030\004 \001(\002\"X\n\013MessageType\022\034\n\030"
           + "MESSAGE_TYPE_UNSPECIFIED\020\000\022\016\n\nTRANSCRIPT"
-          + "\020\001\022\033\n\027END_OF_SINGLE_UTTERANCE\020\002\"\235\001\n\020Inpu"
-          + "tAudioConfig\022A\n\016audio_encoding\030\001 \001(\0162).g"
-          + "oogle.cloud.dialogflow.v2.AudioEncoding\022"
-          + "\031\n\021sample_rate_hertz\030\002 \001(\005\022\025\n\rlanguage_c"
-          + "ode\030\003 \001(\t\022\024\n\014phrase_hints\030\004 \003(\t\"0\n\tTextI"
+          + "\020\001\022\033\n\027END_OF_SINGLE_UTTERANCE\020\002\"0\n\tTextI"
           + "nput\022\014\n\004text\030\001 \001(\t\022\025\n\rlanguage_code\030\002 \001("
           + "\t\"^\n\nEventInput\022\014\n\004name\030\001 \001(\t\022+\n\nparamet"
           + "ers\030\002 \001(\0132\027.google.protobuf.Struct\022\025\n\rla"
@@ -166,26 +158,20 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
           + "ent\030\001 \001(\010\"^\n\027SentimentAnalysisResult\022C\n\024"
           + "query_text_sentiment\030\001 \001(\0132%.google.clou"
           + "d.dialogflow.v2.Sentiment\"-\n\tSentiment\022\r"
-          + "\n\005score\030\001 \001(\002\022\021\n\tmagnitude\030\002 \001(\002*\373\001\n\rAud"
-          + "ioEncoding\022\036\n\032AUDIO_ENCODING_UNSPECIFIED"
-          + "\020\000\022\034\n\030AUDIO_ENCODING_LINEAR_16\020\001\022\027\n\023AUDI"
-          + "O_ENCODING_FLAC\020\002\022\030\n\024AUDIO_ENCODING_MULA"
-          + "W\020\003\022\026\n\022AUDIO_ENCODING_AMR\020\004\022\031\n\025AUDIO_ENC"
-          + "ODING_AMR_WB\020\005\022\033\n\027AUDIO_ENCODING_OGG_OPU"
-          + "S\020\006\022)\n%AUDIO_ENCODING_SPEEX_WITH_HEADER_"
-          + "BYTE\020\0072\326\002\n\010Sessions\022\264\001\n\014DetectIntent\022/.g"
-          + "oogle.cloud.dialogflow.v2.DetectIntentRe"
-          + "quest\0320.google.cloud.dialogflow.v2.Detec"
-          + "tIntentResponse\"A\202\323\344\223\002;\"6/v2/{session=pr"
-          + "ojects/*/agent/sessions/*}:detectIntent:"
-          + "\001*\022\222\001\n\025StreamingDetectIntent\0228.google.cl"
-          + "oud.dialogflow.v2.StreamingDetectIntentR"
-          + "equest\0329.google.cloud.dialogflow.v2.Stre"
-          + "amingDetectIntentResponse\"\000(\0010\001B\233\001\n\036com."
-          + "google.cloud.dialogflow.v2B\014SessionProto"
-          + "P\001ZDgoogle.golang.org/genproto/googleapi"
-          + "s/cloud/dialogflow/v2;dialogflow\370\001\001\242\002\002DF"
-          + "\252\002\032Google.Cloud.Dialogflow.V2b\006proto3"
+          + "\n\005score\030\001 \001(\002\022\021\n\tmagnitude\030\002 \001(\0022\326\002\n\010Ses"
+          + "sions\022\264\001\n\014DetectIntent\022/.google.cloud.di"
+          + "alogflow.v2.DetectIntentRequest\0320.google"
+          + ".cloud.dialogflow.v2.DetectIntentRespons"
+          + "e\"A\202\323\344\223\002;\"6/v2/{session=projects/*/agent"
+          + "/sessions/*}:detectIntent:\001*\022\222\001\n\025Streami"
+          + "ngDetectIntent\0228.google.cloud.dialogflow"
+          + ".v2.StreamingDetectIntentRequest\0329.googl"
+          + "e.cloud.dialogflow.v2.StreamingDetectInt"
+          + "entResponse\"\000(\0010\001B\233\001\n\036com.google.cloud.d"
+          + "ialogflow.v2B\014SessionProtoP\001ZDgoogle.gol"
+          + "ang.org/genproto/googleapis/cloud/dialog"
+          + "flow/v2;dialogflow\370\001\001\242\002\002DF\252\002\032Google.Clou"
+          + "d.Dialogflow.V2b\006proto3"
     };
     com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
         new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
@@ -303,16 +289,8 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
             new java.lang.String[] {
               "MessageType", "Transcript", "IsFinal", "Confidence",
             });
-    internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor =
-        getDescriptor().getMessageTypes().get(8);
-    internal_static_google_cloud_dialogflow_v2_InputAudioConfig_fieldAccessorTable =
-        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
-            internal_static_google_cloud_dialogflow_v2_InputAudioConfig_descriptor,
-            new java.lang.String[] {
-              "AudioEncoding", "SampleRateHertz", "LanguageCode", "PhraseHints",
-            });
     internal_static_google_cloud_dialogflow_v2_TextInput_descriptor =
-        getDescriptor().getMessageTypes().get(9);
+        getDescriptor().getMessageTypes().get(8);
     internal_static_google_cloud_dialogflow_v2_TextInput_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_TextInput_descriptor,
@@ -320,7 +298,7 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
               "Text", "LanguageCode",
             });
     internal_static_google_cloud_dialogflow_v2_EventInput_descriptor =
-        getDescriptor().getMessageTypes().get(10);
+        getDescriptor().getMessageTypes().get(9);
     internal_static_google_cloud_dialogflow_v2_EventInput_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_EventInput_descriptor,
@@ -328,7 +306,7 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
               "Name", "Parameters", "LanguageCode",
             });
     internal_static_google_cloud_dialogflow_v2_SentimentAnalysisRequestConfig_descriptor =
-        getDescriptor().getMessageTypes().get(11);
+        getDescriptor().getMessageTypes().get(10);
     internal_static_google_cloud_dialogflow_v2_SentimentAnalysisRequestConfig_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_SentimentAnalysisRequestConfig_descriptor,
@@ -336,7 +314,7 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
               "AnalyzeQueryTextSentiment",
             });
     internal_static_google_cloud_dialogflow_v2_SentimentAnalysisResult_descriptor =
-        getDescriptor().getMessageTypes().get(12);
+        getDescriptor().getMessageTypes().get(11);
     internal_static_google_cloud_dialogflow_v2_SentimentAnalysisResult_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_SentimentAnalysisResult_descriptor,
@@ -344,7 +322,7 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
               "QueryTextSentiment",
             });
     internal_static_google_cloud_dialogflow_v2_Sentiment_descriptor =
-        getDescriptor().getMessageTypes().get(13);
+        getDescriptor().getMessageTypes().get(12);
     internal_static_google_cloud_dialogflow_v2_Sentiment_fieldAccessorTable =
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2_Sentiment_descriptor,
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SpeechModelVariant.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SpeechModelVariant.java
new file mode 100644
index 000000000000..ffaf71bf0ecc
--- /dev/null
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SpeechModelVariant.java
@@ -0,0 +1,214 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/v2/audio_config.proto
+
+package com.google.cloud.dialogflow.v2;
+
+/**
+ *
+ *
+ * <pre>
+ * Variant of the specified [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+ * See the [Cloud Speech
+ * documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+ * for which models have different variants. For example, the "phone_call" model
+ * has both a standard and an enhanced variant. When you use an enhanced model,
+ * you will generally receive higher quality results than for a standard model.
+ * </pre>
+ *
+ * Protobuf enum {@code google.cloud.dialogflow.v2.SpeechModelVariant}
+ */
+public enum SpeechModelVariant implements com.google.protobuf.ProtocolMessageEnum {
+  /**
+   *
+   *
+   * <pre>
+   * No model variant specified. In this case Dialogflow defaults to
+   * USE_BEST_AVAILABLE.
+   * </pre>
+   *
+   * <code>SPEECH_MODEL_VARIANT_UNSPECIFIED = 0;</code>
+   */
+  SPEECH_MODEL_VARIANT_UNSPECIFIED(0),
+  /**
+   *
+   *
+   * <pre>
+   * Use the best available variant of the [Speech
+   * model][InputAudioConfig.model] that the caller is eligible for.
+   * Please see the [Dialogflow
+   * docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging) for
+   * how to make your project eligible for enhanced models.
+   * </pre>
+   *
+   * <code>USE_BEST_AVAILABLE = 1;</code>
+   */
+  USE_BEST_AVAILABLE(1),
+  /**
+   *
+   *
+   * <pre>
+   * Use standard model variant even if an enhanced model is available.  See the
+   * [Cloud Speech
+   * documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   * for details about enhanced models.
+   * </pre>
+   *
+   * <code>USE_STANDARD = 2;</code>
+   */
+  USE_STANDARD(2),
+  /**
+   *
+   *
+   * <pre>
+   * Use an enhanced model variant:
+   * * If an enhanced variant does not exist for the given
+   *   [model][google.cloud.dialogflow.v2.InputAudioConfig.model] and request language, Dialogflow falls
+   *   back to the standard variant.
+   *   The [Cloud Speech
+   *   documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   *   describes which models have enhanced variants.
+   * * If the API caller isn't eligible for enhanced models, Dialogflow returns
+   *   an error. Please see the [Dialogflow
+   *   docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging)
+   *   for how to make your project eligible.
+   * </pre>
+   *
+   * <code>USE_ENHANCED = 3;</code>
+   */
+  USE_ENHANCED(3),
+  UNRECOGNIZED(-1),
+  ;
+
+  /**
+   *
+   *
+   * <pre>
+   * No model variant specified. In this case Dialogflow defaults to
+   * USE_BEST_AVAILABLE.
+   * </pre>
+   *
+   * <code>SPEECH_MODEL_VARIANT_UNSPECIFIED = 0;</code>
+   */
+  public static final int SPEECH_MODEL_VARIANT_UNSPECIFIED_VALUE = 0;
+  /**
+   *
+   *
+   * <pre>
+   * Use the best available variant of the [Speech
+   * model][InputAudioConfig.model] that the caller is eligible for.
+   * Please see the [Dialogflow
+   * docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging) for
+   * how to make your project eligible for enhanced models.
+   * </pre>
+   *
+   * <code>USE_BEST_AVAILABLE = 1;</code>
+   */
+  public static final int USE_BEST_AVAILABLE_VALUE = 1;
+  /**
+   *
+   *
+   * <pre>
+   * Use standard model variant even if an enhanced model is available.  See the
+   * [Cloud Speech
+   * documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   * for details about enhanced models.
+   * </pre>
+   *
+   * <code>USE_STANDARD = 2;</code>
+   */
+  public static final int USE_STANDARD_VALUE = 2;
+  /**
+   *
+   *
+   * <pre>
+   * Use an enhanced model variant:
+   * * If an enhanced variant does not exist for the given
+   *   [model][google.cloud.dialogflow.v2.InputAudioConfig.model] and request language, Dialogflow falls
+   *   back to the standard variant.
+   *   The [Cloud Speech
+   *   documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   *   describes which models have enhanced variants.
+   * * If the API caller isn't eligible for enhanced models, Dialogflow returns
+   *   an error. Please see the [Dialogflow
+   *   docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging)
+   *   for how to make your project eligible.
+   * </pre>
+   *
+   * <code>USE_ENHANCED = 3;</code>
+   */
+  public static final int USE_ENHANCED_VALUE = 3;
+
+  public final int getNumber() {
+    if (this == UNRECOGNIZED) {
+      throw new java.lang.IllegalArgumentException(
+          "Can't get the number of an unknown enum value.");
+    }
+    return value;
+  }
+
+  /** @deprecated Use {@link #forNumber(int)} instead. */
+  @java.lang.Deprecated
+  public static SpeechModelVariant valueOf(int value) {
+    return forNumber(value);
+  }
+
+  public static SpeechModelVariant forNumber(int value) {
+    switch (value) {
+      case 0:
+        return SPEECH_MODEL_VARIANT_UNSPECIFIED;
+      case 1:
+        return USE_BEST_AVAILABLE;
+      case 2:
+        return USE_STANDARD;
+      case 3:
+        return USE_ENHANCED;
+      default:
+        return null;
+    }
+  }
+
+  public static com.google.protobuf.Internal.EnumLiteMap<SpeechModelVariant> internalGetValueMap() {
+    return internalValueMap;
+  }
+
+  private static final com.google.protobuf.Internal.EnumLiteMap<SpeechModelVariant>
+      internalValueMap =
+          new com.google.protobuf.Internal.EnumLiteMap<SpeechModelVariant>() {
+            public SpeechModelVariant findValueByNumber(int number) {
+              return SpeechModelVariant.forNumber(number);
+            }
+          };
+
+  public final com.google.protobuf.Descriptors.EnumValueDescriptor getValueDescriptor() {
+    return getDescriptor().getValues().get(ordinal());
+  }
+
+  public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType() {
+    return getDescriptor();
+  }
+
+  public static final com.google.protobuf.Descriptors.EnumDescriptor getDescriptor() {
+    return com.google.cloud.dialogflow.v2.AudioConfigProto.getDescriptor().getEnumTypes().get(1);
+  }
+
+  private static final SpeechModelVariant[] VALUES = values();
+
+  public static SpeechModelVariant valueOf(
+      com.google.protobuf.Descriptors.EnumValueDescriptor desc) {
+    if (desc.getType() != getDescriptor()) {
+      throw new java.lang.IllegalArgumentException("EnumValueDescriptor is not for this type.");
+    }
+    if (desc.getIndex() == -1) {
+      return UNRECOGNIZED;
+    }
+    return VALUES[desc.getIndex()];
+  }
+
+  private final int value;
+
+  private SpeechModelVariant(int value) {
+    this.value = value;
+  }
+
+  // @@protoc_insertion_point(enum_scope:google.cloud.dialogflow.v2.SpeechModelVariant)
+}
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SsmlVoiceGender.java b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SsmlVoiceGender.java
index 0708caefdbfe..e9108184f68f 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SsmlVoiceGender.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/java/com/google/cloud/dialogflow/v2/SsmlVoiceGender.java
@@ -149,7 +149,7 @@ public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType
   }
 
   public static final com.google.protobuf.Descriptors.EnumDescriptor getDescriptor() {
-    return com.google.cloud.dialogflow.v2.AudioConfigProto.getDescriptor().getEnumTypes().get(0);
+    return com.google.cloud.dialogflow.v2.AudioConfigProto.getDescriptor().getEnumTypes().get(2);
   }
 
   private static final SsmlVoiceGender[] VALUES = values();
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/audio_config.proto b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/audio_config.proto
index d3ae64e9f8cd..800e5c6ad662 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/audio_config.proto
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/audio_config.proto
@@ -27,6 +27,129 @@ option java_outer_classname = "AudioConfigProto";
 option java_package = "com.google.cloud.dialogflow.v2";
 option objc_class_prefix = "DF";
 
+// Audio encoding of the audio content sent in the conversational query request.
+// Refer to the
+// [Cloud Speech API
+// documentation](https://cloud.google.com/speech-to-text/docs/basics) for more
+// details.
+enum AudioEncoding {
+  // Not specified.
+  AUDIO_ENCODING_UNSPECIFIED = 0;
+
+  // Uncompressed 16-bit signed little-endian samples (Linear PCM).
+  AUDIO_ENCODING_LINEAR_16 = 1;
+
+  // [`FLAC`](https://xiph.org/flac/documentation.html) (Free Lossless Audio
+  // Codec) is the recommended encoding because it is lossless (therefore
+  // recognition is not compromised) and requires only about half the
+  // bandwidth of `LINEAR16`. `FLAC` stream encoding supports 16-bit and
+  // 24-bit samples, however, not all fields in `STREAMINFO` are supported.
+  AUDIO_ENCODING_FLAC = 2;
+
+  // 8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law.
+  AUDIO_ENCODING_MULAW = 3;
+
+  // Adaptive Multi-Rate Narrowband codec. `sample_rate_hertz` must be 8000.
+  AUDIO_ENCODING_AMR = 4;
+
+  // Adaptive Multi-Rate Wideband codec. `sample_rate_hertz` must be 16000.
+  AUDIO_ENCODING_AMR_WB = 5;
+
+  // Opus encoded audio frames in Ogg container
+  // ([OggOpus](https://wiki.xiph.org/OggOpus)).
+  // `sample_rate_hertz` must be 16000.
+  AUDIO_ENCODING_OGG_OPUS = 6;
+
+  // Although the use of lossy encodings is not recommended, if a very low
+  // bitrate encoding is required, `OGG_OPUS` is highly preferred over
+  // Speex encoding. The [Speex](https://speex.org/) encoding supported by
+  // Dialogflow API has a header byte in each block, as in MIME type
+  // `audio/x-speex-with-header-byte`.
+  // It is a variant of the RTP Speex encoding defined in
+  // [RFC 5574](https://tools.ietf.org/html/rfc5574).
+  // The stream is a sequence of blocks, one block per RTP packet. Each block
+  // starts with a byte containing the length of the block, in bytes, followed
+  // by one or more frames of Speex data, padded to an integral number of
+  // bytes (octets) as specified in RFC 5574. In other words, each RTP header
+  // is replaced with a single byte containing the block length. Only Speex
+  // wideband is supported. `sample_rate_hertz` must be 16000.
+  AUDIO_ENCODING_SPEEX_WITH_HEADER_BYTE = 7;
+}
+
+// Variant of the specified [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+//
+// See the [Cloud Speech
+// documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+// for which models have different variants. For example, the "phone_call" model
+// has both a standard and an enhanced variant. When you use an enhanced model,
+// you will generally receive higher quality results than for a standard model.
+enum SpeechModelVariant {
+  // No model variant specified. In this case Dialogflow defaults to
+  // USE_BEST_AVAILABLE.
+  SPEECH_MODEL_VARIANT_UNSPECIFIED = 0;
+
+  // Use the best available variant of the [Speech
+  // model][InputAudioConfig.model] that the caller is eligible for.
+  //
+  // Please see the [Dialogflow
+  // docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging) for
+  // how to make your project eligible for enhanced models.
+  USE_BEST_AVAILABLE = 1;
+
+  // Use standard model variant even if an enhanced model is available.  See the
+  // [Cloud Speech
+  // documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+  // for details about enhanced models.
+  USE_STANDARD = 2;
+
+  // Use an enhanced model variant:
+  //
+  // * If an enhanced variant does not exist for the given
+  //   [model][google.cloud.dialogflow.v2.InputAudioConfig.model] and request language, Dialogflow falls
+  //   back to the standard variant.
+  //
+  //   The [Cloud Speech
+  //   documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+  //   describes which models have enhanced variants.
+  //
+  // * If the API caller isn't eligible for enhanced models, Dialogflow returns
+  //   an error. Please see the [Dialogflow
+  //   docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging)
+  //   for how to make your project eligible.
+  USE_ENHANCED = 3;
+}
+
+// Instructs the speech recognizer how to process the audio content.
+message InputAudioConfig {
+  // Required. Audio encoding of the audio content to process.
+  AudioEncoding audio_encoding = 1;
+
+  // Required. Sample rate (in Hertz) of the audio content sent in the query.
+  // Refer to
+  // [Cloud Speech API
+  // documentation](https://cloud.google.com/speech-to-text/docs/basics) for
+  // more details.
+  int32 sample_rate_hertz = 2;
+
+  // Required. The language of the supplied audio. Dialogflow does not do
+  // translations. See [Language
+  // Support](https://cloud.google.com/dialogflow-enterprise/docs/reference/language)
+  // for a list of the currently supported language codes. Note that queries in
+  // the same session do not necessarily need to specify the same language.
+  string language_code = 3;
+
+  // Optional. The collection of phrase hints which are used to boost accuracy
+  // of speech recognition.
+  // Refer to
+  // [Cloud Speech API
+  // documentation](https://cloud.google.com/speech-to-text/docs/basics#phrase-hints)
+  // for more details.
+  repeated string phrase_hints = 4;
+
+  // Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2.InputAudioConfig.model] to use.
+  SpeechModelVariant model_variant = 10;
+}
+
 // Gender of the voice as described in
 // [SSML voice element](https://www.w3.org/TR/speech-synthesis11/#edef_voice).
 enum SsmlVoiceGender {
@@ -109,7 +232,7 @@ enum OutputAudioEncoding {
   OUTPUT_AUDIO_ENCODING_OGG_OPUS = 3;
 }
 
-// Instructs the speech synthesizer how to generate the output audio content.
+// Instructs the speech synthesizer on how to generate the output audio content.
 message OutputAudioConfig {
   // Required. Audio encoding of the synthesized audio content.
   OutputAudioEncoding audio_encoding = 1;
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/session.proto b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/session.proto
index e10bb6db836d..a21623baf794 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/session.proto
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2/src/main/proto/google/cloud/dialogflow/v2/session.proto
@@ -418,34 +418,6 @@ message StreamingRecognitionResult {
   float confidence = 4;
 }
 
-// Instructs the speech recognizer how to process the audio content.
-message InputAudioConfig {
-  // Required. Audio encoding of the audio content to process.
-  AudioEncoding audio_encoding = 1;
-
-  // Required. Sample rate (in Hertz) of the audio content sent in the query.
-  // Refer to
-  // [Cloud Speech API
-  // documentation](https://cloud.google.com/speech-to-text/docs/basics) for
-  // more details.
-  int32 sample_rate_hertz = 2;
-
-  // Required. The language of the supplied audio. Dialogflow does not do
-  // translations. See [Language
-  // Support](https://cloud.google.com/dialogflow-enterprise/docs/reference/language)
-  // for a list of the currently supported language codes. Note that queries in
-  // the same session do not necessarily need to specify the same language.
-  string language_code = 3;
-
-  // Optional. The collection of phrase hints which are used to boost accuracy
-  // of speech recognition.
-  // Refer to
-  // [Cloud Speech API
-  // documentation](https://cloud.google.com/speech-to-text/docs/basics#phrase-hints)
-  // for more details.
-  repeated string phrase_hints = 4;
-}
-
 // Represents the natural language text to be processed.
 message TextInput {
   // Required. The UTF-8 encoded natural language text to be processed.
@@ -459,55 +431,6 @@ message TextInput {
   string language_code = 2;
 }
 
-// Audio encoding of the audio content sent in the conversational query request.
-// Refer to the
-// [Cloud Speech API
-// documentation](https://cloud.google.com/speech-to-text/docs/basics) for more
-// details.
-enum AudioEncoding {
-  // Not specified.
-  AUDIO_ENCODING_UNSPECIFIED = 0;
-
-  // Uncompressed 16-bit signed little-endian samples (Linear PCM).
-  AUDIO_ENCODING_LINEAR_16 = 1;
-
-  // [`FLAC`](https://xiph.org/flac/documentation.html) (Free Lossless Audio
-  // Codec) is the recommended encoding because it is lossless (therefore
-  // recognition is not compromised) and requires only about half the
-  // bandwidth of `LINEAR16`. `FLAC` stream encoding supports 16-bit and
-  // 24-bit samples, however, not all fields in `STREAMINFO` are supported.
-  AUDIO_ENCODING_FLAC = 2;
-
-  // 8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law.
-  AUDIO_ENCODING_MULAW = 3;
-
-  // Adaptive Multi-Rate Narrowband codec. `sample_rate_hertz` must be 8000.
-  AUDIO_ENCODING_AMR = 4;
-
-  // Adaptive Multi-Rate Wideband codec. `sample_rate_hertz` must be 16000.
-  AUDIO_ENCODING_AMR_WB = 5;
-
-  // Opus encoded audio frames in Ogg container
-  // ([OggOpus](https://wiki.xiph.org/OggOpus)).
-  // `sample_rate_hertz` must be 16000.
-  AUDIO_ENCODING_OGG_OPUS = 6;
-
-  // Although the use of lossy encodings is not recommended, if a very low
-  // bitrate encoding is required, `OGG_OPUS` is highly preferred over
-  // Speex encoding. The [Speex](https://speex.org/) encoding supported by
-  // Dialogflow API has a header byte in each block, as in MIME type
-  // `audio/x-speex-with-header-byte`.
-  // It is a variant of the RTP Speex encoding defined in
-  // [RFC 5574](https://tools.ietf.org/html/rfc5574).
-  // The stream is a sequence of blocks, one block per RTP packet. Each block
-  // starts with a byte containing the length of the block, in bytes, followed
-  // by one or more frames of Speex data, padded to an integral number of
-  // bytes (octets) as specified in RFC 5574. In other words, each RTP header
-  // is replaced with a single byte containing the block length. Only Speex
-  // wideband is supported. `sample_rate_hertz` must be 16000.
-  AUDIO_ENCODING_SPEEX_WITH_HEADER_BYTE = 7;
-}
-
 // Events allow for matching intents by event name instead of the natural
 // language input. For instance, input `<event: { name: "welcome_event",
 // parameters: { name: "Sam" } }>` can trigger a personalized welcome response.
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/AudioConfigProto.java b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/AudioConfigProto.java
index 4ef97493f92d..7e67a1d09cf9 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/AudioConfigProto.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/AudioConfigProto.java
@@ -39,43 +39,48 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
     java.lang.String[] descriptorData = {
       "\n2google/cloud/dialogflow/v2beta1/audio_"
           + "config.proto\022\037google.cloud.dialogflow.v2"
-          + "beta1\032\034google/api/annotations.proto\"\261\001\n\020"
+          + "beta1\032\034google/api/annotations.proto\"\375\001\n\020"
           + "InputAudioConfig\022F\n\016audio_encoding\030\001 \001(\016"
           + "2..google.cloud.dialogflow.v2beta1.Audio"
           + "Encoding\022\031\n\021sample_rate_hertz\030\002 \001(\005\022\025\n\rl"
           + "anguage_code\030\003 \001(\t\022\024\n\014phrase_hints\030\004 \003(\t"
-          + "\022\r\n\005model\030\007 \001(\t\"k\n\024VoiceSelectionParams\022"
-          + "\014\n\004name\030\001 \001(\t\022E\n\013ssml_gender\030\002 \001(\01620.goo"
-          + "gle.cloud.dialogflow.v2beta1.SsmlVoiceGe"
-          + "nder\"\270\001\n\026SynthesizeSpeechConfig\022\025\n\rspeak"
-          + "ing_rate\030\001 \001(\001\022\r\n\005pitch\030\002 \001(\001\022\026\n\016volume_"
-          + "gain_db\030\003 \001(\001\022\032\n\022effects_profile_id\030\005 \003("
-          + "\t\022D\n\005voice\030\004 \001(\01325.google.cloud.dialogfl"
-          + "ow.v2beta1.VoiceSelectionParams\"\327\001\n\021Outp"
-          + "utAudioConfig\022L\n\016audio_encoding\030\001 \001(\01624."
-          + "google.cloud.dialogflow.v2beta1.OutputAu"
-          + "dioEncoding\022\031\n\021sample_rate_hertz\030\002 \001(\005\022Y"
-          + "\n\030synthesize_speech_config\030\003 \001(\01327.googl"
-          + "e.cloud.dialogflow.v2beta1.SynthesizeSpe"
-          + "echConfig*\373\001\n\rAudioEncoding\022\036\n\032AUDIO_ENC"
-          + "ODING_UNSPECIFIED\020\000\022\034\n\030AUDIO_ENCODING_LI"
-          + "NEAR_16\020\001\022\027\n\023AUDIO_ENCODING_FLAC\020\002\022\030\n\024AU"
-          + "DIO_ENCODING_MULAW\020\003\022\026\n\022AUDIO_ENCODING_A"
-          + "MR\020\004\022\031\n\025AUDIO_ENCODING_AMR_WB\020\005\022\033\n\027AUDIO"
-          + "_ENCODING_OGG_OPUS\020\006\022)\n%AUDIO_ENCODING_S"
-          + "PEEX_WITH_HEADER_BYTE\020\007*\215\001\n\017SsmlVoiceGen"
-          + "der\022!\n\035SSML_VOICE_GENDER_UNSPECIFIED\020\000\022\032"
-          + "\n\026SSML_VOICE_GENDER_MALE\020\001\022\034\n\030SSML_VOICE"
-          + "_GENDER_FEMALE\020\002\022\035\n\031SSML_VOICE_GENDER_NE"
-          + "UTRAL\020\003*\244\001\n\023OutputAudioEncoding\022%\n!OUTPU"
-          + "T_AUDIO_ENCODING_UNSPECIFIED\020\000\022#\n\037OUTPUT"
-          + "_AUDIO_ENCODING_LINEAR_16\020\001\022\035\n\031OUTPUT_AU"
-          + "DIO_ENCODING_MP3\020\002\022\"\n\036OUTPUT_AUDIO_ENCOD"
-          + "ING_OGG_OPUS\020\003B\256\001\n#com.google.cloud.dial"
-          + "ogflow.v2beta1B\020AudioConfigProtoP\001ZIgoog"
-          + "le.golang.org/genproto/googleapis/cloud/"
-          + "dialogflow/v2beta1;dialogflow\370\001\001\242\002\002DF\252\002\037"
-          + "Google.Cloud.Dialogflow.V2beta1b\006proto3"
+          + "\022\r\n\005model\030\007 \001(\t\022J\n\rmodel_variant\030\n \001(\01623"
+          + ".google.cloud.dialogflow.v2beta1.SpeechM"
+          + "odelVariant\"k\n\024VoiceSelectionParams\022\014\n\004n"
+          + "ame\030\001 \001(\t\022E\n\013ssml_gender\030\002 \001(\01620.google."
+          + "cloud.dialogflow.v2beta1.SsmlVoiceGender"
+          + "\"\270\001\n\026SynthesizeSpeechConfig\022\025\n\rspeaking_"
+          + "rate\030\001 \001(\001\022\r\n\005pitch\030\002 \001(\001\022\026\n\016volume_gain"
+          + "_db\030\003 \001(\001\022\032\n\022effects_profile_id\030\005 \003(\t\022D\n"
+          + "\005voice\030\004 \001(\01325.google.cloud.dialogflow.v"
+          + "2beta1.VoiceSelectionParams\"\327\001\n\021OutputAu"
+          + "dioConfig\022L\n\016audio_encoding\030\001 \001(\01624.goog"
+          + "le.cloud.dialogflow.v2beta1.OutputAudioE"
+          + "ncoding\022\031\n\021sample_rate_hertz\030\002 \001(\005\022Y\n\030sy"
+          + "nthesize_speech_config\030\003 \001(\01327.google.cl"
+          + "oud.dialogflow.v2beta1.SynthesizeSpeechC"
+          + "onfig*\373\001\n\rAudioEncoding\022\036\n\032AUDIO_ENCODIN"
+          + "G_UNSPECIFIED\020\000\022\034\n\030AUDIO_ENCODING_LINEAR"
+          + "_16\020\001\022\027\n\023AUDIO_ENCODING_FLAC\020\002\022\030\n\024AUDIO_"
+          + "ENCODING_MULAW\020\003\022\026\n\022AUDIO_ENCODING_AMR\020\004"
+          + "\022\031\n\025AUDIO_ENCODING_AMR_WB\020\005\022\033\n\027AUDIO_ENC"
+          + "ODING_OGG_OPUS\020\006\022)\n%AUDIO_ENCODING_SPEEX"
+          + "_WITH_HEADER_BYTE\020\007*v\n\022SpeechModelVarian"
+          + "t\022$\n SPEECH_MODEL_VARIANT_UNSPECIFIED\020\000\022"
+          + "\026\n\022USE_BEST_AVAILABLE\020\001\022\020\n\014USE_STANDARD\020"
+          + "\002\022\020\n\014USE_ENHANCED\020\003*\215\001\n\017SsmlVoiceGender\022"
+          + "!\n\035SSML_VOICE_GENDER_UNSPECIFIED\020\000\022\032\n\026SS"
+          + "ML_VOICE_GENDER_MALE\020\001\022\034\n\030SSML_VOICE_GEN"
+          + "DER_FEMALE\020\002\022\035\n\031SSML_VOICE_GENDER_NEUTRA"
+          + "L\020\003*\244\001\n\023OutputAudioEncoding\022%\n!OUTPUT_AU"
+          + "DIO_ENCODING_UNSPECIFIED\020\000\022#\n\037OUTPUT_AUD"
+          + "IO_ENCODING_LINEAR_16\020\001\022\035\n\031OUTPUT_AUDIO_"
+          + "ENCODING_MP3\020\002\022\"\n\036OUTPUT_AUDIO_ENCODING_"
+          + "OGG_OPUS\020\003B\256\001\n#com.google.cloud.dialogfl"
+          + "ow.v2beta1B\020AudioConfigProtoP\001ZIgoogle.g"
+          + "olang.org/genproto/googleapis/cloud/dial"
+          + "ogflow/v2beta1;dialogflow\370\001\001\242\002\002DF\252\002\037Goog"
+          + "le.Cloud.Dialogflow.V2beta1b\006proto3"
     };
     com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
         new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
@@ -97,7 +102,12 @@ public com.google.protobuf.ExtensionRegistry assignDescriptors(
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_dialogflow_v2beta1_InputAudioConfig_descriptor,
             new java.lang.String[] {
-              "AudioEncoding", "SampleRateHertz", "LanguageCode", "PhraseHints", "Model",
+              "AudioEncoding",
+              "SampleRateHertz",
+              "LanguageCode",
+              "PhraseHints",
+              "Model",
+              "ModelVariant",
             });
     internal_static_google_cloud_dialogflow_v2beta1_VoiceSelectionParams_descriptor =
         getDescriptor().getMessageTypes().get(1);
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfig.java b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfig.java
index 55a9a07f01f8..40e1dc84af93 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfig.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfig.java
@@ -7,7 +7,7 @@
  *
  *
  * <pre>
- * Instructs the speech recognizer how to process the audio content.
+ * Instructs the speech recognizer on how to process the audio content.
  * </pre>
  *
  * Protobuf type {@code google.cloud.dialogflow.v2beta1.InputAudioConfig}
@@ -27,6 +27,7 @@ private InputAudioConfig() {
     languageCode_ = "";
     phraseHints_ = com.google.protobuf.LazyStringArrayList.EMPTY;
     model_ = "";
+    modelVariant_ = 0;
   }
 
   @java.lang.Override
@@ -89,6 +90,13 @@ private InputAudioConfig(
               model_ = s;
               break;
             }
+          case 80:
+            {
+              int rawValue = input.readEnum();
+
+              modelVariant_ = rawValue;
+              break;
+            }
           default:
             {
               if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
@@ -361,6 +369,38 @@ public com.google.protobuf.ByteString getModelBytes() {
     }
   }
 
+  public static final int MODEL_VARIANT_FIELD_NUMBER = 10;
+  private int modelVariant_;
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+   */
+  public int getModelVariantValue() {
+    return modelVariant_;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+   */
+  public com.google.cloud.dialogflow.v2beta1.SpeechModelVariant getModelVariant() {
+    @SuppressWarnings("deprecation")
+    com.google.cloud.dialogflow.v2beta1.SpeechModelVariant result =
+        com.google.cloud.dialogflow.v2beta1.SpeechModelVariant.valueOf(modelVariant_);
+    return result == null
+        ? com.google.cloud.dialogflow.v2beta1.SpeechModelVariant.UNRECOGNIZED
+        : result;
+  }
+
   private byte memoizedIsInitialized = -1;
 
   @java.lang.Override
@@ -392,6 +432,11 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (!getModelBytes().isEmpty()) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, model_);
     }
+    if (modelVariant_
+        != com.google.cloud.dialogflow.v2beta1.SpeechModelVariant.SPEECH_MODEL_VARIANT_UNSPECIFIED
+            .getNumber()) {
+      output.writeEnum(10, modelVariant_);
+    }
     unknownFields.writeTo(output);
   }
 
@@ -423,6 +468,11 @@ public int getSerializedSize() {
     if (!getModelBytes().isEmpty()) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, model_);
     }
+    if (modelVariant_
+        != com.google.cloud.dialogflow.v2beta1.SpeechModelVariant.SPEECH_MODEL_VARIANT_UNSPECIFIED
+            .getNumber()) {
+      size += com.google.protobuf.CodedOutputStream.computeEnumSize(10, modelVariant_);
+    }
     size += unknownFields.getSerializedSize();
     memoizedSize = size;
     return size;
@@ -444,6 +494,7 @@ public boolean equals(final java.lang.Object obj) {
     if (!getLanguageCode().equals(other.getLanguageCode())) return false;
     if (!getPhraseHintsList().equals(other.getPhraseHintsList())) return false;
     if (!getModel().equals(other.getModel())) return false;
+    if (modelVariant_ != other.modelVariant_) return false;
     if (!unknownFields.equals(other.unknownFields)) return false;
     return true;
   }
@@ -467,6 +518,8 @@ public int hashCode() {
     }
     hash = (37 * hash) + MODEL_FIELD_NUMBER;
     hash = (53 * hash) + getModel().hashCode();
+    hash = (37 * hash) + MODEL_VARIANT_FIELD_NUMBER;
+    hash = (53 * hash) + modelVariant_;
     hash = (29 * hash) + unknownFields.hashCode();
     memoizedHashCode = hash;
     return hash;
@@ -571,7 +624,7 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    *
    *
    * <pre>
-   * Instructs the speech recognizer how to process the audio content.
+   * Instructs the speech recognizer on how to process the audio content.
    * </pre>
    *
    * Protobuf type {@code google.cloud.dialogflow.v2beta1.InputAudioConfig}
@@ -622,6 +675,8 @@ public Builder clear() {
       bitField0_ = (bitField0_ & ~0x00000008);
       model_ = "";
 
+      modelVariant_ = 0;
+
       return this;
     }
 
@@ -660,6 +715,7 @@ public com.google.cloud.dialogflow.v2beta1.InputAudioConfig buildPartial() {
       }
       result.phraseHints_ = phraseHints_;
       result.model_ = model_;
+      result.modelVariant_ = modelVariant_;
       result.bitField0_ = to_bitField0_;
       onBuilt();
       return result;
@@ -735,6 +791,9 @@ public Builder mergeFrom(com.google.cloud.dialogflow.v2beta1.InputAudioConfig ot
         model_ = other.model_;
         onChanged();
       }
+      if (other.modelVariant_ != 0) {
+        setModelVariantValue(other.getModelVariantValue());
+      }
       this.mergeUnknownFields(other.unknownFields);
       onChanged();
       return this;
@@ -1347,6 +1406,84 @@ public Builder setModelBytes(com.google.protobuf.ByteString value) {
       return this;
     }
 
+    private int modelVariant_ = 0;
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+     */
+    public int getModelVariantValue() {
+      return modelVariant_;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+     */
+    public Builder setModelVariantValue(int value) {
+      modelVariant_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+     */
+    public com.google.cloud.dialogflow.v2beta1.SpeechModelVariant getModelVariant() {
+      @SuppressWarnings("deprecation")
+      com.google.cloud.dialogflow.v2beta1.SpeechModelVariant result =
+          com.google.cloud.dialogflow.v2beta1.SpeechModelVariant.valueOf(modelVariant_);
+      return result == null
+          ? com.google.cloud.dialogflow.v2beta1.SpeechModelVariant.UNRECOGNIZED
+          : result;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+     */
+    public Builder setModelVariant(com.google.cloud.dialogflow.v2beta1.SpeechModelVariant value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      modelVariant_ = value.getNumber();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+     * </pre>
+     *
+     * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+     */
+    public Builder clearModelVariant() {
+
+      modelVariant_ = 0;
+      onChanged();
+      return this;
+    }
+
     @java.lang.Override
     public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
       return super.setUnknownFields(unknownFields);
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfigOrBuilder.java b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfigOrBuilder.java
index a2a2c48b8644..da25c3ef3063 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfigOrBuilder.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/InputAudioConfigOrBuilder.java
@@ -174,4 +174,25 @@ public interface InputAudioConfigOrBuilder
    * <code>string model = 7;</code>
    */
   com.google.protobuf.ByteString getModelBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+   */
+  int getModelVariantValue();
+  /**
+   *
+   *
+   * <pre>
+   * Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+   * </pre>
+   *
+   * <code>.google.cloud.dialogflow.v2beta1.SpeechModelVariant model_variant = 10;</code>
+   */
+  com.google.cloud.dialogflow.v2beta1.SpeechModelVariant getModelVariant();
 }
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/OutputAudioEncoding.java b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/OutputAudioEncoding.java
index f46dee66703a..1de522c1c579 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/OutputAudioEncoding.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/OutputAudioEncoding.java
@@ -158,7 +158,7 @@ public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType
   public static final com.google.protobuf.Descriptors.EnumDescriptor getDescriptor() {
     return com.google.cloud.dialogflow.v2beta1.AudioConfigProto.getDescriptor()
         .getEnumTypes()
-        .get(2);
+        .get(3);
   }
 
   private static final OutputAudioEncoding[] VALUES = values();
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SpeechModelVariant.java b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SpeechModelVariant.java
new file mode 100644
index 000000000000..c08c12c25e7c
--- /dev/null
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SpeechModelVariant.java
@@ -0,0 +1,216 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/v2beta1/audio_config.proto
+
+package com.google.cloud.dialogflow.v2beta1;
+
+/**
+ *
+ *
+ * <pre>
+ * Variant of the specified [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+ * See the [Cloud Speech
+ * documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+ * for which models have different variants. For example, the "phone_call" model
+ * has both a standard and an enhanced variant. When you use an enhanced model,
+ * you will generally receive higher quality results than for a standard model.
+ * </pre>
+ *
+ * Protobuf enum {@code google.cloud.dialogflow.v2beta1.SpeechModelVariant}
+ */
+public enum SpeechModelVariant implements com.google.protobuf.ProtocolMessageEnum {
+  /**
+   *
+   *
+   * <pre>
+   * No model variant specified. In this case Dialogflow defaults to
+   * USE_BEST_AVAILABLE.
+   * </pre>
+   *
+   * <code>SPEECH_MODEL_VARIANT_UNSPECIFIED = 0;</code>
+   */
+  SPEECH_MODEL_VARIANT_UNSPECIFIED(0),
+  /**
+   *
+   *
+   * <pre>
+   * Use the best available variant of the [Speech
+   * model][InputAudioConfig.model] that the caller is eligible for.
+   * Please see the [Dialogflow
+   * docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging) for
+   * how to make your project eligible for enhanced models.
+   * </pre>
+   *
+   * <code>USE_BEST_AVAILABLE = 1;</code>
+   */
+  USE_BEST_AVAILABLE(1),
+  /**
+   *
+   *
+   * <pre>
+   * Use standard model variant even if an enhanced model is available.  See the
+   * [Cloud Speech
+   * documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   * for details about enhanced models.
+   * </pre>
+   *
+   * <code>USE_STANDARD = 2;</code>
+   */
+  USE_STANDARD(2),
+  /**
+   *
+   *
+   * <pre>
+   * Use an enhanced model variant:
+   * * If an enhanced variant does not exist for the given
+   *   [model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] and request language, Dialogflow falls
+   *   back to the standard variant.
+   *   The [Cloud Speech
+   *   documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   *   describes which models have enhanced variants.
+   * * If the API caller isn't eligible for enhanced models, Dialogflow returns
+   *   an error.  Please see the [Dialogflow
+   *   docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging)
+   *   for how to make your project eligible.
+   * </pre>
+   *
+   * <code>USE_ENHANCED = 3;</code>
+   */
+  USE_ENHANCED(3),
+  UNRECOGNIZED(-1),
+  ;
+
+  /**
+   *
+   *
+   * <pre>
+   * No model variant specified. In this case Dialogflow defaults to
+   * USE_BEST_AVAILABLE.
+   * </pre>
+   *
+   * <code>SPEECH_MODEL_VARIANT_UNSPECIFIED = 0;</code>
+   */
+  public static final int SPEECH_MODEL_VARIANT_UNSPECIFIED_VALUE = 0;
+  /**
+   *
+   *
+   * <pre>
+   * Use the best available variant of the [Speech
+   * model][InputAudioConfig.model] that the caller is eligible for.
+   * Please see the [Dialogflow
+   * docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging) for
+   * how to make your project eligible for enhanced models.
+   * </pre>
+   *
+   * <code>USE_BEST_AVAILABLE = 1;</code>
+   */
+  public static final int USE_BEST_AVAILABLE_VALUE = 1;
+  /**
+   *
+   *
+   * <pre>
+   * Use standard model variant even if an enhanced model is available.  See the
+   * [Cloud Speech
+   * documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   * for details about enhanced models.
+   * </pre>
+   *
+   * <code>USE_STANDARD = 2;</code>
+   */
+  public static final int USE_STANDARD_VALUE = 2;
+  /**
+   *
+   *
+   * <pre>
+   * Use an enhanced model variant:
+   * * If an enhanced variant does not exist for the given
+   *   [model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] and request language, Dialogflow falls
+   *   back to the standard variant.
+   *   The [Cloud Speech
+   *   documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+   *   describes which models have enhanced variants.
+   * * If the API caller isn't eligible for enhanced models, Dialogflow returns
+   *   an error.  Please see the [Dialogflow
+   *   docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging)
+   *   for how to make your project eligible.
+   * </pre>
+   *
+   * <code>USE_ENHANCED = 3;</code>
+   */
+  public static final int USE_ENHANCED_VALUE = 3;
+
+  public final int getNumber() {
+    if (this == UNRECOGNIZED) {
+      throw new java.lang.IllegalArgumentException(
+          "Can't get the number of an unknown enum value.");
+    }
+    return value;
+  }
+
+  /** @deprecated Use {@link #forNumber(int)} instead. */
+  @java.lang.Deprecated
+  public static SpeechModelVariant valueOf(int value) {
+    return forNumber(value);
+  }
+
+  public static SpeechModelVariant forNumber(int value) {
+    switch (value) {
+      case 0:
+        return SPEECH_MODEL_VARIANT_UNSPECIFIED;
+      case 1:
+        return USE_BEST_AVAILABLE;
+      case 2:
+        return USE_STANDARD;
+      case 3:
+        return USE_ENHANCED;
+      default:
+        return null;
+    }
+  }
+
+  public static com.google.protobuf.Internal.EnumLiteMap<SpeechModelVariant> internalGetValueMap() {
+    return internalValueMap;
+  }
+
+  private static final com.google.protobuf.Internal.EnumLiteMap<SpeechModelVariant>
+      internalValueMap =
+          new com.google.protobuf.Internal.EnumLiteMap<SpeechModelVariant>() {
+            public SpeechModelVariant findValueByNumber(int number) {
+              return SpeechModelVariant.forNumber(number);
+            }
+          };
+
+  public final com.google.protobuf.Descriptors.EnumValueDescriptor getValueDescriptor() {
+    return getDescriptor().getValues().get(ordinal());
+  }
+
+  public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType() {
+    return getDescriptor();
+  }
+
+  public static final com.google.protobuf.Descriptors.EnumDescriptor getDescriptor() {
+    return com.google.cloud.dialogflow.v2beta1.AudioConfigProto.getDescriptor()
+        .getEnumTypes()
+        .get(1);
+  }
+
+  private static final SpeechModelVariant[] VALUES = values();
+
+  public static SpeechModelVariant valueOf(
+      com.google.protobuf.Descriptors.EnumValueDescriptor desc) {
+    if (desc.getType() != getDescriptor()) {
+      throw new java.lang.IllegalArgumentException("EnumValueDescriptor is not for this type.");
+    }
+    if (desc.getIndex() == -1) {
+      return UNRECOGNIZED;
+    }
+    return VALUES[desc.getIndex()];
+  }
+
+  private final int value;
+
+  private SpeechModelVariant(int value) {
+    this.value = value;
+  }
+
+  // @@protoc_insertion_point(enum_scope:google.cloud.dialogflow.v2beta1.SpeechModelVariant)
+}
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SsmlVoiceGender.java b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SsmlVoiceGender.java
index 8e2fdfa13796..3e4335d48ae2 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SsmlVoiceGender.java
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/java/com/google/cloud/dialogflow/v2beta1/SsmlVoiceGender.java
@@ -151,7 +151,7 @@ public final com.google.protobuf.Descriptors.EnumDescriptor getDescriptorForType
   public static final com.google.protobuf.Descriptors.EnumDescriptor getDescriptor() {
     return com.google.cloud.dialogflow.v2beta1.AudioConfigProto.getDescriptor()
         .getEnumTypes()
-        .get(1);
+        .get(2);
   }
 
   private static final SsmlVoiceGender[] VALUES = values();
diff --git a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/proto/google/cloud/dialogflow/v2beta1/audio_config.proto b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/proto/google/cloud/dialogflow/v2beta1/audio_config.proto
index 8045290b22d4..9ce81863dc05 100644
--- a/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/proto/google/cloud/dialogflow/v2beta1/audio_config.proto
+++ b/google-api-grpc/proto-google-cloud-dialogflow-v2beta1/src/main/proto/google/cloud/dialogflow/v2beta1/audio_config.proto
@@ -76,7 +76,50 @@ enum AudioEncoding {
   AUDIO_ENCODING_SPEEX_WITH_HEADER_BYTE = 7;
 }
 
-// Instructs the speech recognizer how to process the audio content.
+// Variant of the specified [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+//
+// See the [Cloud Speech
+// documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+// for which models have different variants. For example, the "phone_call" model
+// has both a standard and an enhanced variant. When you use an enhanced model,
+// you will generally receive higher quality results than for a standard model.
+enum SpeechModelVariant {
+  // No model variant specified. In this case Dialogflow defaults to
+  // USE_BEST_AVAILABLE.
+  SPEECH_MODEL_VARIANT_UNSPECIFIED = 0;
+
+  // Use the best available variant of the [Speech
+  // model][InputAudioConfig.model] that the caller is eligible for.
+  //
+  // Please see the [Dialogflow
+  // docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging) for
+  // how to make your project eligible for enhanced models.
+  USE_BEST_AVAILABLE = 1;
+
+  // Use standard model variant even if an enhanced model is available.  See the
+  // [Cloud Speech
+  // documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+  // for details about enhanced models.
+  USE_STANDARD = 2;
+
+  // Use an enhanced model variant:
+  //
+  // * If an enhanced variant does not exist for the given
+  //   [model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] and request language, Dialogflow falls
+  //   back to the standard variant.
+  //
+  //   The [Cloud Speech
+  //   documentation](https://cloud.google.com/speech-to-text/docs/enhanced-models)
+  //   describes which models have enhanced variants.
+  //
+  // * If the API caller isn't eligible for enhanced models, Dialogflow returns
+  //   an error.  Please see the [Dialogflow
+  //   docs](https://cloud.google.com/dialogflow-enterprise/docs/data-logging)
+  //   for how to make your project eligible.
+  USE_ENHANCED = 3;
+}
+
+// Instructs the speech recognizer on how to process the audio content.
 message InputAudioConfig {
   // Required. Audio encoding of the audio content to process.
   AudioEncoding audio_encoding = 1;
@@ -115,6 +158,9 @@ message InputAudioConfig {
   // documentation](https://cloud.google.com/speech-to-text/docs/basics#select-model)
   // for more details.
   string model = 7;
+
+  // Optional. Which variant of the [Speech model][google.cloud.dialogflow.v2beta1.InputAudioConfig.model] to use.
+  SpeechModelVariant model_variant = 10;
 }
 
 // Gender of the voice as described in
diff --git a/google-cloud-clients/google-cloud-dialogflow/synth.metadata b/google-cloud-clients/google-cloud-dialogflow/synth.metadata
index c12021cfdfc0..9f0ddf72cbec 100644
--- a/google-cloud-clients/google-cloud-dialogflow/synth.metadata
+++ b/google-cloud-clients/google-cloud-dialogflow/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-04-10T07:43:29.853673Z",
+  "updateTime": "2019-04-30T07:42:19.370029Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.25",
-        "dockerImage": "googleapis/artman@sha256:d9597f983d1d4e61272c63cb97b7d8f8234da9999526c35d357de3d781f0ec1b"
+        "version": "0.17.1",
+        "dockerImage": "googleapis/artman@sha256:a40ca4dd4ef031c0ded4df4909ffdf7b3f20d29b23e682ef991eb60ba0ca6025"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "3f57de2fbe951640b587d9c2d503daf554747749",
-        "internalRef": "242707837"
+        "sha": "be3005c8a16e8424d0330e977ac78f2976bf01d3",
+        "internalRef": "245840921"
       }
     }
   ],