diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.create_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.create_budget.js
new file mode 100644
index 00000000000..c2e6f9d6df4
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.create_budget.js
@@ -0,0 +1,58 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(parent, budget) {
+  // [START billingbudgets_v1_generated_BudgetService_CreateBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. The name of the billing account to create the budget in. Values
+   *  are of the form `billingAccounts/{billingAccountId}`.
+   */
+  // const parent = 'abc123'
+  /**
+   *  Required. Budget to create.
+   */
+  // const budget = ''
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} = require('@google-cloud/billing-budgets').v1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function createBudget() {
+    // Construct request
+    const request = {
+      parent,
+      budget,
+    };
+
+    // Run request
+    const response = await budgetsClient.createBudget(request);
+    console.log(response);
+  }
+
+  createBudget();
+  // [END billingbudgets_v1_generated_BudgetService_CreateBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.delete_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.delete_budget.js
new file mode 100644
index 00000000000..b0976c65c31
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.delete_budget.js
@@ -0,0 +1,53 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(name) {
+  // [START billingbudgets_v1_generated_BudgetService_DeleteBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. Name of the budget to delete. Values are of the form
+   *  `billingAccounts/{billingAccountId}/budgets/{budgetId}`.
+   */
+  // const name = 'abc123'
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} = require('@google-cloud/billing-budgets').v1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function deleteBudget() {
+    // Construct request
+    const request = {
+      name,
+    };
+
+    // Run request
+    const response = await budgetsClient.deleteBudget(request);
+    console.log(response);
+  }
+
+  deleteBudget();
+  // [END billingbudgets_v1_generated_BudgetService_DeleteBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.get_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.get_budget.js
new file mode 100644
index 00000000000..ba11a08a760
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.get_budget.js
@@ -0,0 +1,53 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(name) {
+  // [START billingbudgets_v1_generated_BudgetService_GetBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. Name of budget to get. Values are of the form
+   *  `billingAccounts/{billingAccountId}/budgets/{budgetId}`.
+   */
+  // const name = 'abc123'
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} = require('@google-cloud/billing-budgets').v1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function getBudget() {
+    // Construct request
+    const request = {
+      name,
+    };
+
+    // Run request
+    const response = await budgetsClient.getBudget(request);
+    console.log(response);
+  }
+
+  getBudget();
+  // [END billingbudgets_v1_generated_BudgetService_GetBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.list_budgets.js b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.list_budgets.js
new file mode 100644
index 00000000000..eeeb5864b87
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.list_budgets.js
@@ -0,0 +1,66 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(parent) {
+  // [START billingbudgets_v1_generated_BudgetService_ListBudgets_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. Name of billing account to list budgets under. Values
+   *  are of the form `billingAccounts/{billingAccountId}`.
+   */
+  // const parent = 'abc123'
+  /**
+   *  Optional. The maximum number of budgets to return per page.
+   *  The default and maximum value are 100.
+   */
+  // const pageSize = 1234
+  /**
+   *  Optional. The value returned by the last `ListBudgetsResponse` which
+   *  indicates that this is a continuation of a prior `ListBudgets` call,
+   *  and that the system should return the next page of data.
+   */
+  // const pageToken = 'abc123'
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} = require('@google-cloud/billing-budgets').v1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function listBudgets() {
+    // Construct request
+    const request = {
+      parent,
+    };
+
+    // Run request
+    const iterable = await budgetsClient.listBudgetsAsync(request);
+    for await (const response of iterable) {
+      console.log(response);
+    }
+  }
+
+  listBudgets();
+  // [END billingbudgets_v1_generated_BudgetService_ListBudgets_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.update_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.update_budget.js
new file mode 100644
index 00000000000..43e748234da
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1/budget_service.update_budget.js
@@ -0,0 +1,62 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(budget) {
+  // [START billingbudgets_v1_generated_BudgetService_UpdateBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. The updated budget object.
+   *  The budget to update is specified by the budget name in the budget.
+   */
+  // const budget = ''
+  /**
+   *  Optional. Indicates which fields in the provided budget to update.
+   *  Read-only fields (such as `name`) cannot be changed. If this is not
+   *  provided, then only fields with non-default values from the request are
+   *  updated. See
+   *  https://developers.google.com/protocol-buffers/docs/proto3#default for more
+   *  details about default values.
+   */
+  // const updateMask = ''
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} = require('@google-cloud/billing-budgets').v1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function updateBudget() {
+    // Construct request
+    const request = {
+      budget,
+    };
+
+    // Run request
+    const response = await budgetsClient.updateBudget(request);
+    console.log(response);
+  }
+
+  updateBudget();
+  // [END billingbudgets_v1_generated_BudgetService_UpdateBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.create_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.create_budget.js
new file mode 100644
index 00000000000..2818a894499
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.create_budget.js
@@ -0,0 +1,59 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(parent, budget) {
+  // [START billingbudgets_v1beta1_generated_BudgetService_CreateBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. The name of the billing account to create the budget in. Values
+   *  are of the form `billingAccounts/{billingAccountId}`.
+   */
+  // const parent = 'abc123'
+  /**
+   *  Required. Budget to create.
+   */
+  // const budget = ''
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} =
+    require('@google-cloud/billing-budgets').v1beta1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function createBudget() {
+    // Construct request
+    const request = {
+      parent,
+      budget,
+    };
+
+    // Run request
+    const response = await budgetsClient.createBudget(request);
+    console.log(response);
+  }
+
+  createBudget();
+  // [END billingbudgets_v1beta1_generated_BudgetService_CreateBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.delete_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.delete_budget.js
new file mode 100644
index 00000000000..1fc7a370c56
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.delete_budget.js
@@ -0,0 +1,54 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(name) {
+  // [START billingbudgets_v1beta1_generated_BudgetService_DeleteBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. Name of the budget to delete. Values are of the form
+   *  `billingAccounts/{billingAccountId}/budgets/{budgetId}`.
+   */
+  // const name = 'abc123'
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} =
+    require('@google-cloud/billing-budgets').v1beta1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function deleteBudget() {
+    // Construct request
+    const request = {
+      name,
+    };
+
+    // Run request
+    const response = await budgetsClient.deleteBudget(request);
+    console.log(response);
+  }
+
+  deleteBudget();
+  // [END billingbudgets_v1beta1_generated_BudgetService_DeleteBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.get_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.get_budget.js
new file mode 100644
index 00000000000..90d099d2fd0
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.get_budget.js
@@ -0,0 +1,54 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(name) {
+  // [START billingbudgets_v1beta1_generated_BudgetService_GetBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. Name of budget to get. Values are of the form
+   *  `billingAccounts/{billingAccountId}/budgets/{budgetId}`.
+   */
+  // const name = 'abc123'
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} =
+    require('@google-cloud/billing-budgets').v1beta1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function getBudget() {
+    // Construct request
+    const request = {
+      name,
+    };
+
+    // Run request
+    const response = await budgetsClient.getBudget(request);
+    console.log(response);
+  }
+
+  getBudget();
+  // [END billingbudgets_v1beta1_generated_BudgetService_GetBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.list_budgets.js b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.list_budgets.js
new file mode 100644
index 00000000000..b463754a615
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.list_budgets.js
@@ -0,0 +1,67 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(parent) {
+  // [START billingbudgets_v1beta1_generated_BudgetService_ListBudgets_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. Name of billing account to list budgets under. Values
+   *  are of the form `billingAccounts/{billingAccountId}`.
+   */
+  // const parent = 'abc123'
+  /**
+   *  Optional. The maximum number of budgets to return per page.
+   *  The default and maximum value are 100.
+   */
+  // const pageSize = 1234
+  /**
+   *  Optional. The value returned by the last `ListBudgetsResponse` which
+   *  indicates that this is a continuation of a prior `ListBudgets` call,
+   *  and that the system should return the next page of data.
+   */
+  // const pageToken = 'abc123'
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} =
+    require('@google-cloud/billing-budgets').v1beta1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function listBudgets() {
+    // Construct request
+    const request = {
+      parent,
+    };
+
+    // Run request
+    const iterable = await budgetsClient.listBudgetsAsync(request);
+    for await (const response of iterable) {
+      console.log(response);
+    }
+  }
+
+  listBudgets();
+  // [END billingbudgets_v1beta1_generated_BudgetService_ListBudgets_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.update_budget.js b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.update_budget.js
new file mode 100644
index 00000000000..af6b23698a1
--- /dev/null
+++ b/packages/google-cloud-billing-budgets/samples/generated/v1beta1/budget_service.update_budget.js
@@ -0,0 +1,63 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+function main(budget) {
+  // [START billingbudgets_v1beta1_generated_BudgetService_UpdateBudget_async]
+  /**
+   * TODO(developer): Uncomment these variables before running the sample.
+   */
+  /**
+   *  Required. The updated budget object.
+   *  The budget to update is specified by the budget name in the budget.
+   */
+  // const budget = ''
+  /**
+   *  Optional. Indicates which fields in the provided budget to update.
+   *  Read-only fields (such as `name`) cannot be changed. If this is not
+   *  provided, then only fields with non-default values from the request are
+   *  updated. See
+   *  https://developers.google.com/protocol-buffers/docs/proto3#default for more
+   *  details about default values.
+   */
+  // const updateMask = ''
+
+  // Imports the Budgets library
+  const {BudgetServiceClient} =
+    require('@google-cloud/billing-budgets').v1beta1;
+
+  // Instantiates a client
+  const budgetsClient = new BudgetServiceClient();
+
+  async function updateBudget() {
+    // Construct request
+    const request = {
+      budget,
+    };
+
+    // Run request
+    const response = await budgetsClient.updateBudget(request);
+    console.log(response);
+  }
+
+  updateBudget();
+  // [END billingbudgets_v1beta1_generated_BudgetService_UpdateBudget_async]
+}
+
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+main(...process.argv.slice(2));
diff --git a/packages/google-cloud-billing-budgets/samples/package.json b/packages/google-cloud-billing-budgets/samples/package.json
index 2f2880c7004..735d4ae4c53 100644
--- a/packages/google-cloud-billing-budgets/samples/package.json
+++ b/packages/google-cloud-billing-budgets/samples/package.json
@@ -9,7 +9,7 @@
   "author": "Google LLC",
   "repository": "googleapis/nodejs-billing-budgets",
   "engines": {
-    "node": ">=8"
+    "node": ">=10"
   },
   "scripts": {
     "test": "c8 mocha system-test --timeout=800000"
diff --git a/packages/google-cloud-billing-budgets/src/v1/budget_service_client.ts b/packages/google-cloud-billing-budgets/src/v1/budget_service_client.ts
index 5dfd2b71c7a..6bd1e5ab385 100644
--- a/packages/google-cloud-billing-budgets/src/v1/budget_service_client.ts
+++ b/packages/google-cloud-billing-budgets/src/v1/budget_service_client.ts
@@ -859,7 +859,8 @@ export class BudgetServiceClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    const callSettings = new gax.CallSettings(options);
+    const defaultCallSettings = this._defaults['listBudgets'];
+    const callSettings = defaultCallSettings.merge(options);
     this.initialize();
     return this.descriptors.page.listBudgets.createStream(
       this.innerApiCalls.listBudgets as gax.GaxCall,
@@ -913,7 +914,8 @@ export class BudgetServiceClient {
         parent: request.parent || '',
       });
     options = options || {};
-    const callSettings = new gax.CallSettings(options);
+    const defaultCallSettings = this._defaults['listBudgets'];
+    const callSettings = defaultCallSettings.merge(options);
     this.initialize();
     return this.descriptors.page.listBudgets.asyncIterate(
       this.innerApiCalls['listBudgets'] as GaxCall,
diff --git a/packages/google-cloud-billing-budgets/src/v1beta1/budget_service_client.ts b/packages/google-cloud-billing-budgets/src/v1beta1/budget_service_client.ts
index aed44bfe547..b6dc4f2ebeb 100644
--- a/packages/google-cloud-billing-budgets/src/v1beta1/budget_service_client.ts
+++ b/packages/google-cloud-billing-budgets/src/v1beta1/budget_service_client.ts
@@ -878,7 +878,8 @@ export class BudgetServiceClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    const callSettings = new gax.CallSettings(options);
+    const defaultCallSettings = this._defaults['listBudgets'];
+    const callSettings = defaultCallSettings.merge(options);
     this.initialize();
     return this.descriptors.page.listBudgets.createStream(
       this.innerApiCalls.listBudgets as gax.GaxCall,
@@ -932,7 +933,8 @@ export class BudgetServiceClient {
         parent: request.parent || '',
       });
     options = options || {};
-    const callSettings = new gax.CallSettings(options);
+    const defaultCallSettings = this._defaults['listBudgets'];
+    const callSettings = defaultCallSettings.merge(options);
     this.initialize();
     return this.descriptors.page.listBudgets.asyncIterate(
       this.innerApiCalls['listBudgets'] as GaxCall,