diff --git a/README.md b/README.md
index 90ef2724f..e6a711570 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
+
 Vonage Client Library for .NET
 ===================================
 
@@ -209,7 +210,7 @@ var credentials = Credentials.FromApiKeyAndSecret(
 
 var vonageClient = new VonageClient(credentials);
 
-var response = vonageClient.SmsClient.SendAnSms(new Vonage.Messaging.SendSmsRequest()
+var response = await vonageClient.SmsClient.SendAnSmsAsync(new Vonage.Messaging.SendSmsRequest()
 {
     To = TO_NUMBER,
     From = VONAGE_BRAND_NAME,
@@ -337,7 +338,7 @@ Use [Vonage's Redact API][doc_redact] to redact a SMS message.
 var credentials = Credentials.FromApiKeyAndSecret(VONAGE_API_KEY, VONAGE_API_SECRET);
 var client = new VonageClient(credentials);
 var request = new RedactRequest() { Id = VONAGE_REDACT_ID, Type = VONAGE_REDACT_TYPE, Product = VONAGE_REDACT_PRODUCT };
-var response = client.RedactClient.Redact(request);
+var response = await client.RedactClient.RedactAsync(request);
 ```
 
 ### Initiating a Call
@@ -351,7 +352,7 @@ var creds = Credentials.FromAppIdAndPrivateKeyPath(VONAGE_APPLICATION_ID, VONAGE
 var client = new VonageClient(creds);
 
 var command = new CallCommand() { To = new Endpoint[] { toEndpoint }, From = fromEndpoint, AnswerUrl=new[] { ANSWER_URL}};
-var response = client.VoiceClient.CreateCall(command);
+var response = await client.VoiceClient.CreateCallAsync(command);
 ```
 
 ### Receiving a Call
@@ -378,7 +379,7 @@ public string Answer()
 var credentials = Credentials.FromAppIdAndPrivateKeyPath(VONAGE_APPLICATION_ID, VONAGE_PRIVATE_KEY_PATH);
 var client = new VonageClient(credentials);
 
-var response = client.VoiceClient.GetCall(UUID);
+var response = await client.VoiceClient.GetCallAsync(UUID);
 ```
 
 ### Sending 2FA Code
@@ -390,7 +391,7 @@ var credentials = Credentials.FromApiKeyAndSecret(VONAGE_API_KEY, VONAGE_API_SEC
 var client = new VonageClient(credentials);
 
 var request = new VerifyRequest() { Brand = BRAND_NAME, Number = RECIPIENT_NUMBER };
-var response = client.VerifyClient.VerifyRequest(request);
+var response = await client.VerifyClient.VerifyRequestAsync(request);
 ```
 
 ### Checking 2FA Code
@@ -402,7 +403,7 @@ var credentials = Credentials.FromApiKeyAndSecret(VONAGE_API_KEY, VONAGE_API_SEC
 var client = new VonageClient(credentials);
 
 var request = new VerifyCheckRequest() { Code = CODE, RequestId = REQUEST_ID };
-var response = client.VerifyClient.VerifyCheck(request);
+var response = await client.VerifyClient.VerifyCheckAsync(request);
 ```
 
 ### Additional Examples
@@ -437,7 +438,7 @@ The following is a list of Vonage APIs and whether the Vonage .NET SDK provides
 ## FAQ
 
 Q: Does the .NET SDK Support the async pattern?
-A: The .NET SDK does not support the async pattern at this time.
+A: Yes
 
 Contributing
 ------------
diff --git a/Vonage.Test.Unit/AccountTest.cs b/Vonage.Test.Unit/AccountTest.cs
index 926475b3f..91c12086b 100644
--- a/Vonage.Test.Unit/AccountTest.cs
+++ b/Vonage.Test.Unit/AccountTest.cs
@@ -13,7 +13,7 @@ public class AccountTest : TestBase
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void GetAccountBalance(bool passCreds)
+        public async Task GetAccountBalance(bool passCreds)
         {
             //ARRANGE
             var expectedUri = $"{RestUrl}/account/get-balance?api_key={ApiKey}&api_secret={ApiSecret}&";
@@ -24,11 +24,11 @@ public void GetAccountBalance(bool passCreds)
             var client = new VonageClient(creds);
             Accounts.Balance balance;
             if (passCreds) {
-                balance = client.AccountClient.GetAccountBalance(creds);
+                balance = await client.AccountClient.GetAccountBalanceAsync(creds);
             }            
             else 
             {
-                balance = client.AccountClient.GetAccountBalance();
+                balance = await client.AccountClient.GetAccountBalanceAsync();
             }
 
             //ASSERT
@@ -39,7 +39,7 @@ public void GetAccountBalance(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void SetSettings(bool passCreds)
+        public async Task SetSettings(bool passCreds)
         {
             //ARRANGE
             var expectedUri = $"{RestUrl}/account/settings";
@@ -53,11 +53,11 @@ public void SetSettings(bool passCreds)
             Accounts.AccountSettingsResult result;
             if (passCreds)
             {
-                result = client.AccountClient.ChangeAccountSettings(new Accounts.AccountSettingsRequest { MoCallBackUrl = "https://example.com/webhooks/inbound-sms", DrCallBackUrl = "https://example.com/webhooks/delivery-receipt" }, creds);
+                result = await client.AccountClient.ChangeAccountSettingsAsync(new Accounts.AccountSettingsRequest { MoCallBackUrl = "https://example.com/webhooks/inbound-sms", DrCallBackUrl = "https://example.com/webhooks/delivery-receipt" }, creds);
             }
             else
             {
-                result = client.AccountClient.ChangeAccountSettings(new Accounts.AccountSettingsRequest { MoCallBackUrl = "https://example.com/webhooks/inbound-sms", DrCallBackUrl = "https://example.com/webhooks/delivery-receipt" });
+                result = await client.AccountClient.ChangeAccountSettingsAsync(new Accounts.AccountSettingsRequest { MoCallBackUrl = "https://example.com/webhooks/inbound-sms", DrCallBackUrl = "https://example.com/webhooks/delivery-receipt" });
             }
             
 
@@ -72,7 +72,7 @@ public void SetSettings(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void TopUp(bool passCreds)
+        public async Task TopUp(bool passCreds)
         {
             //ARRANGE            
             var expectedUri = $"{RestUrl}/account/top-up?trx=00X123456Y7890123Z&api_key={ApiKey}&api_secret={ApiSecret}&";
@@ -85,11 +85,11 @@ public void TopUp(bool passCreds)
             Accounts.TopUpResult response;
             if (passCreds)
             {
-                response = client.AccountClient.TopUpAccountBalance(new Accounts.TopUpRequest { Trx = "00X123456Y7890123Z" },creds);
+                response = await client.AccountClient.TopUpAccountBalanceAsync(new Accounts.TopUpRequest { Trx = "00X123456Y7890123Z" },creds);
             }
             else
             {
-                response = client.AccountClient.TopUpAccountBalance(new Accounts.TopUpRequest { Trx = "00X123456Y7890123Z" });
+                response = await client.AccountClient.TopUpAccountBalanceAsync(new Accounts.TopUpRequest { Trx = "00X123456Y7890123Z" });
             }
 
             Assert.Equal("abc123",response.Response);
@@ -98,7 +98,7 @@ public void TopUp(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void GetNumbers(bool passCreds)
+        public async Task GetNumbers(bool passCreds)
         {
             //ARRANGE
             var expectedUri = $"{RestUrl}/account/numbers?api_key={ApiKey}&api_secret={ApiSecret}&";
@@ -110,11 +110,11 @@ public void GetNumbers(bool passCreds)
             var client = new VonageClient(creds);
             Numbers.NumbersSearchResponse numbers;
             if (passCreds){
-                numbers = client.NumbersClient.GetOwnedNumbers(new Numbers.NumberSearchRequest(), creds);
+                numbers = await client.NumbersClient.GetOwnedNumbersAsync(new Numbers.NumberSearchRequest(), creds);
             }
             else
             {
-                numbers = client.NumbersClient.GetOwnedNumbers(new Numbers.NumberSearchRequest());
+                numbers = await client.NumbersClient.GetOwnedNumbersAsync(new Numbers.NumberSearchRequest());
             }            
 
             //ASSERT
@@ -128,7 +128,7 @@ public void GetNumbers(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void RetrieveApiSecrets(bool passCreds)
+        public async Task RetrieveApiSecrets(bool passCreds)
         {
             //ARRANGE            
             var expectedResponse = @"{
@@ -160,11 +160,11 @@ public void RetrieveApiSecrets(bool passCreds)
             Accounts.SecretsRequestResult secrets;
             if (passCreds)
             {
-                secrets = client.AccountClient.RetrieveApiSecrets(ApiKey,creds);
+                secrets = await client.AccountClient.RetrieveApiSecretsAsync(ApiKey,creds);
             }
             else
             {
-                secrets = client.AccountClient.RetrieveApiSecrets(ApiKey);
+                secrets = await client.AccountClient.RetrieveApiSecretsAsync(ApiKey);
             }
             
 
@@ -178,7 +178,7 @@ public void RetrieveApiSecrets(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void CreateApiSecret(bool passCreds)
+        public async Task CreateApiSecret(bool passCreds)
         {            
             //ARRANGE            
             var expectedUri = $"https://api.nexmo.com/accounts/{ApiKey}/secrets";
@@ -199,11 +199,11 @@ public void CreateApiSecret(bool passCreds)
             Accounts.Secret secret;
             if (passCreds)
             {
-                secret = client.AccountClient.CreateApiSecret(new Accounts.CreateSecretRequest { Secret = "password" }, ApiKey, creds);
+                secret = await client.AccountClient.CreateApiSecretAsync(new Accounts.CreateSecretRequest { Secret = "password" }, ApiKey, creds);
             }
             else
             {
-                secret = client.AccountClient.CreateApiSecret(new Accounts.CreateSecretRequest { Secret = "password" }, ApiKey);
+                secret = await client.AccountClient.CreateApiSecretAsync(new Accounts.CreateSecretRequest { Secret = "password" }, ApiKey);
             }
             
 
@@ -216,7 +216,7 @@ public void CreateApiSecret(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void RetrieveSecret(bool passCreds)
+        public async Task RetrieveSecret(bool passCreds)
         {
 
             //ARRANGE            
@@ -240,11 +240,11 @@ public void RetrieveSecret(bool passCreds)
             Accounts.Secret secret;
             if (passCreds)
             {
-                secret = client.AccountClient.RetrieveApiSecret(secretId, ApiKey, creds);
+                secret = await client.AccountClient.RetrieveApiSecretAsync(secretId, ApiKey, creds);
             }
             else
             {
-                secret = client.AccountClient.RetrieveApiSecret(secretId, ApiKey);
+                secret = await client.AccountClient.RetrieveApiSecretAsync(secretId, ApiKey);
             }
             
 
@@ -257,7 +257,7 @@ public void RetrieveSecret(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void RevokeSecret(bool passCreds)
+        public async Task RevokeSecret(bool passCreds)
         {
             //ARRANGE            
             var secretId = "ad6dc56f-07b5-46e1-a527-85530e625800";
@@ -271,11 +271,11 @@ public void RevokeSecret(bool passCreds)
             bool response;
             if (passCreds)
             {
-                response = client.AccountClient.RevokeApiSecret(secretId, ApiKey, creds);
+                response = await client.AccountClient.RevokeApiSecretAsync(secretId, ApiKey, creds);
             }
             else
             {
-                response = client.AccountClient.RevokeApiSecret(secretId, ApiKey);
+                response = await client.AccountClient.RevokeApiSecretAsync(secretId, ApiKey);
             }
             
 
diff --git a/Vonage.Test.Unit/ApplicationTests.cs b/Vonage.Test.Unit/ApplicationTests.cs
index 5138ea89d..ea781053c 100644
--- a/Vonage.Test.Unit/ApplicationTests.cs
+++ b/Vonage.Test.Unit/ApplicationTests.cs
@@ -17,7 +17,7 @@ public class ApplicationTests : TestBase
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void CreateApplication(bool passCreds)
+        public async Task CreateApplication(bool passCreds)
         {
             //ARRANGE
             var uri = $"{ApiUrl}/v2/applications";
@@ -101,11 +101,11 @@ public void CreateApplication(bool passCreds)
             Application response;
             if (passCreds)
             {
-                response = client.ApplicationClient.CreateApplicaiton(request);
+                response = await client.ApplicationClient.CreateApplicaitonAsync(request);
             }
             else
             {
-                response = client.ApplicationClient.CreateApplicaiton(request, creds);
+                response = await client.ApplicationClient.CreateApplicaitonAsync(request, creds);
             }
             
 
@@ -134,7 +134,7 @@ public void CreateApplication(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void UpdateApplication(bool passCredentials)
+        public async Task UpdateApplication(bool passCredentials)
         {
             var id = "78d335fa323d01149c3dd6f0d48968cf";
             var uri = $"{ApiUrl}/v2/applications/{id}";
@@ -217,11 +217,11 @@ public void UpdateApplication(bool passCredentials)
             Application response;
             if (passCredentials)
             {
-                response = client.ApplicationClient.UpdateApplication(id, application);
+                response = await client.ApplicationClient.UpdateApplicationAsync(id, application);
             }
             else
             {
-                response = client.ApplicationClient.UpdateApplication(id, application,creds);
+                response = await client.ApplicationClient.UpdateApplicationAsync(id, application,creds);
             }
             
 
@@ -250,7 +250,7 @@ public void UpdateApplication(bool passCredentials)
         [Theory]
         [InlineData(false, false)]
         [InlineData(true, true)]
-        public void ListApplications(bool passCreds, bool passParameters)
+        public async Task ListApplications(bool passCreds, bool passParameters)
         {
             var expectedResult = @"{
                   ""page_size"": 10,
@@ -327,11 +327,11 @@ public void ListApplications(bool passCreds, bool passParameters)
             ApplicationPage applications;
             if (passCreds)
             {
-                applications = client.ApplicationClient.ListApplications(request,creds);
+                applications = await client.ApplicationClient.ListApplicationsAsync(request,creds);
             }
             else
             {
-                applications = client.ApplicationClient.ListApplications(request);
+                applications = await client.ApplicationClient.ListApplicationsAsync(request);
             }
 
             Application application = applications.Embedded.Applications[0];
@@ -366,7 +366,7 @@ public void ListApplications(bool passCreds, bool passParameters)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void GetApplication(bool passCreds)
+        public async Task GetApplication(bool passCreds)
         {
             var id = "78d335fa323d01149c3dd6f0d48968cf";
             var uri = $"{ApiUrl}/v2/applications/{id}";
@@ -425,11 +425,11 @@ public void GetApplication(bool passCreds)
             Application application;
             if (passCreds)
             {
-                application = client.ApplicationClient.GetApplication(id, creds);
+                application = await client.ApplicationClient.GetApplicationAsync(id, creds);
             }
             else
             { 
-                application = client.ApplicationClient.GetApplication(id); 
+                application = await client.ApplicationClient.GetApplicationAsync(id); 
             }
 
             Assert.Equal("78d335fa323d01149c3dd6f0d48968cf", application.Id);
@@ -457,7 +457,7 @@ public void GetApplication(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void DeleteApplication(bool passCreds)
+        public async Task DeleteApplication(bool passCreds)
         {
             var id = "78d335fa323d01149c3dd6f0d48968cf";
             var uri = $"{ApiUrl}/v2/applications/{id}";
@@ -468,11 +468,11 @@ public void DeleteApplication(bool passCreds)
             bool result;
             if(passCreds)
             {
-                result = client.ApplicationClient.DeleteApplication(id, creds);
+                result = await client.ApplicationClient.DeleteApplicationAsync(id, creds);
             }
             else
             {
-                result = client.ApplicationClient.DeleteApplication(id);
+                result = await client.ApplicationClient.DeleteApplicationAsync(id);
             }
             Assert.True(result);
         }
diff --git a/Vonage.Test.Unit/ConversionTest.cs b/Vonage.Test.Unit/ConversionTest.cs
index 652d14b27..652a6e3c1 100644
--- a/Vonage.Test.Unit/ConversionTest.cs
+++ b/Vonage.Test.Unit/ConversionTest.cs
@@ -12,7 +12,7 @@ public class ConversionTest : TestBase
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void SmsConversion(bool passCreds)
+        public async Task SmsConversion(bool passCreds)
         {
             var expectedUri = $"${ApiUrl}/conversions/sms";
             var expectedContent = "message-id=00A0B0C0&delivered=true&timestamp=2020-01-01+12%3A00%3A00&api_key=testkey&api_secret=testSecret&";
@@ -24,11 +24,11 @@ public void SmsConversion(bool passCreds)
             bool response;
             if (passCreds)
             {
-                response = client.ConversionClient.SmsConversion(request, creds);
+                response = await client.ConversionClient.SmsConversionAsync(request, creds);
             }
             else
             {
-                response = client.ConversionClient.SmsConversion(request);
+                response = await client.ConversionClient.SmsConversionAsync(request);
             }
             Assert.True(response);
         }
@@ -36,7 +36,7 @@ public void SmsConversion(bool passCreds)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void VoiceConversion(bool passCreds)
+        public async Task VoiceConversion(bool passCreds)
         {
             var expectedUri = $"${ApiUrl}/conversions/sms";
             var expectedContent = "message-id=00A0B0C0&delivered=true&timestamp=2020-01-01+12%3A00%3A00&api_key=testkey&api_secret=testSecret&";
@@ -48,11 +48,11 @@ public void VoiceConversion(bool passCreds)
             bool response;
             if (passCreds)
             {
-                response = client.ConversionClient.VoiceConversion(request, creds);
+                response = await client.ConversionClient.VoiceConversionAsync(request, creds);
             }
             else
             {
-                response = client.ConversionClient.VoiceConversion(request);
+                response = await client.ConversionClient.VoiceConversionAsync(request);
             }
             Assert.True(response);
         }
diff --git a/Vonage.Test.Unit/MessagingTests.cs b/Vonage.Test.Unit/MessagingTests.cs
index 7651f2aba..9ef084675 100644
--- a/Vonage.Test.Unit/MessagingTests.cs
+++ b/Vonage.Test.Unit/MessagingTests.cs
@@ -15,7 +15,7 @@ public class MessagingTests : TestBase
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void KitcenSinkSendSms(bool passCreds)
+        public async Task KitcenSinkSendSms(bool passCreds)
         {
             var expectedResponse = @"{
                   ""message-count"": ""1"",
@@ -65,11 +65,11 @@ public void KitcenSinkSendSms(bool passCreds)
             Messaging.SendSmsResponse response;
             if (passCreds)
             {
-                response = client.SmsClient.SendAnSms(request, creds);
+                response = await client.SmsClient.SendAnSmsAsync(request, creds);
             }
             else
             {
-                response = client.SmsClient.SendAnSms(request);
+                response = await client.SmsClient.SendAnSmsAsync(request);
             }
 
             Assert.Equal("1", response.MessageCount);
@@ -82,7 +82,7 @@ public void KitcenSinkSendSms(bool passCreds)
         }
 
         [Fact]        
-        public void SendSmsTypicalUsage()
+        public async Task SendSmsTypicalUsage()
         {
             var expectedResponse = @"{
                   ""message-count"": ""1"",
@@ -102,7 +102,7 @@ public void SendSmsTypicalUsage()
             var expectedRequestContent = $"from=AcmeInc&to=447700900000&text={HttpUtility.UrlEncode("Hello World!")}&api_key={ApiKey}&api_secret={ApiSecret}&";
             Setup(expectedUri, expectedResponse, expectedRequestContent);
             var client = new VonageClient(Request.Credentials.FromApiKeyAndSecret(ApiKey, ApiSecret));
-            var response = client.SmsClient.SendAnSms(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "Hello World!" });
+            var response = await client.SmsClient.SendAnSmsAsync(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "Hello World!" });
             Assert.Equal("1", response.MessageCount);
             Assert.Equal("447700900000", response.Messages[0].To);
             Assert.Equal("0A0000000123ABCD1", response.Messages[0].MessageId);
@@ -114,7 +114,7 @@ public void SendSmsTypicalUsage()
         }
 
         [Fact]
-        public void SendSmsUnicode()
+        public async Task SendSmsUnicode()
         {
             var expectedResponse = @"{
                   ""message-count"": ""1"",
@@ -134,7 +134,7 @@ public void SendSmsUnicode()
             var expectedRequestContent = $"from=AcmeInc&to=447700900000&text={HttpUtility.UrlEncode("こんにちは世界")}&api_key={ApiKey}&api_secret={ApiSecret}&";
             Setup(expectedUri, expectedResponse, expectedRequestContent);
             var client = new VonageClient(Request.Credentials.FromApiKeyAndSecret(ApiKey, ApiSecret));
-            var response = client.SmsClient.SendAnSms(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "こんにちは世界" });
+            var response = await client.SmsClient.SendAnSmsAsync(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "こんにちは世界" });
             Assert.Equal("1", response.MessageCount);
             Assert.Equal("447700900000", response.Messages[0].To);
             Assert.Equal("0A0000000123ABCD1", response.Messages[0].MessageId);
@@ -146,7 +146,7 @@ public void SendSmsUnicode()
         }
 
         [Fact]
-        public void SendSmsBadResponse()
+        public async Task SendSmsBadResponse()
         {
             var expectedResponse = @"{
                   ""message-count"": ""1"",
@@ -163,7 +163,7 @@ public void SendSmsBadResponse()
             var client = new VonageClient(Request.Credentials.FromApiKeyAndSecret(ApiKey, ApiSecret));
             try
             {
-                var response = client.SmsClient.SendAnSms(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "Hello World!" });
+                var response = await client.SmsClient.SendAnSmsAsync(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "Hello World!" });
                 Assert.True(false);
             }
             catch(Messaging.VonageSmsResponseException nex)
@@ -174,7 +174,7 @@ public void SendSmsBadResponse()
         }
 
         [Fact]
-        public void NullMessagesResponse()
+        public async Task NullMessagesResponse()
         {
             var expectedResponse = @"";
             var expectedUri = $"{RestUrl}/sms/json?";
@@ -183,7 +183,7 @@ public void NullMessagesResponse()
             var client = new VonageClient(Request.Credentials.FromApiKeyAndSecret(ApiKey, ApiSecret));
             try
             {
-                var response = client.SmsClient.SendAnSms(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "Hello World!" });
+                var response = await client.SmsClient.SendAnSmsAsync(new Messaging.SendSmsRequest { From = "AcmeInc", To = "447700900000", Text = "Hello World!" });
                 Assert.True(false);
             }
             catch (Messaging.VonageSmsResponseException nex)
diff --git a/Vonage.Test.Unit/NumberInsightsTests.cs b/Vonage.Test.Unit/NumberInsightsTests.cs
index bd7d1eb6d..dc2fa18f4 100644
--- a/Vonage.Test.Unit/NumberInsightsTests.cs
+++ b/Vonage.Test.Unit/NumberInsightsTests.cs
@@ -14,7 +14,7 @@ public class NumberInsightsTests : TestBase
         [Theory]
         [InlineData(true,true)]
         [InlineData(false,false)]
-        public void TestBasicNIRequest(bool passCreds, bool kitchenSink)
+        public async Task TestBasicNIRequest(bool passCreds, bool kitchenSink)
         {
             //ARRANGE
             var expectedUri = $"{ApiUrl}/ni/basic/json";            
@@ -47,11 +47,11 @@ public void TestBasicNIRequest(bool passCreds, bool kitchenSink)
             var client = new VonageClient(creds);
             if (passCreds)
             {
-                response = client.NumberInsightClient.GetNumberInsightBasic(request, creds);
+                response = await client.NumberInsightClient.GetNumberInsightBasicAsync(request, creds);
             }
             else
             {
-                response = client.NumberInsightClient.GetNumberInsightBasic(request);
+                response = await client.NumberInsightClient.GetNumberInsightBasicAsync(request);
             }
 
             //ASSERT
@@ -69,7 +69,7 @@ public void TestBasicNIRequest(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void TestStandardNIRequest(bool passCreds, bool kitchenSink)
+        public async Task TestStandardNIRequest(bool passCreds, bool kitchenSink)
         {
             //ARRANGE
             var expectedResponse = @"{
@@ -139,11 +139,11 @@ public void TestStandardNIRequest(bool passCreds, bool kitchenSink)
             StandardInsightResponse response;
             if (passCreds)
             {
-                response = client.NumberInsightClient.GetNumberInsightStandard(request, creds);
+                response = await client.NumberInsightClient.GetNumberInsightStandardAsync(request, creds);
             }
             else
             {
-                response = client.NumberInsightClient.GetNumberInsightStandard(request);
+                response = await client.NumberInsightClient.GetNumberInsightStandardAsync(request);
             }
             Assert.Equal("John", response.FirstName);
             Assert.Equal(CallerType.consumer, response.CallerType);
@@ -183,7 +183,7 @@ public void TestStandardNIRequest(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void TestAdvancedNIRequestSync(bool passCreds, bool kitchenSink)
+        public async Task TestAdvancedNIRequestSync(bool passCreds, bool kitchenSink)
         {//ARRANGE
             var expectedResponse = @"{
               ""status"": 0,
@@ -257,11 +257,11 @@ public void TestAdvancedNIRequestSync(bool passCreds, bool kitchenSink)
             AdvancedInsightsResponse response;
             if (passCreds)
             {
-                response = client.NumberInsightClient.GetNumberInsightAdvanced(request, creds);
+                response = await client.NumberInsightClient.GetNumberInsightAdvancedAsync(request, creds);
             }
             else
             {
-                response = client.NumberInsightClient.GetNumberInsightAdvanced(request);
+                response = await client.NumberInsightClient.GetNumberInsightAdvancedAsync(request);
             }
 
             //ASSERT
@@ -307,7 +307,7 @@ public void TestAdvancedNIRequestSync(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void TestAdvancedAsync(bool passCreds, bool kitchenSink)
+        public async Task TestAdvancedAsync(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
               ""request_id"": ""aaaaaaaa-bbbb-cccc-dddd-0123456789ab"",
@@ -340,11 +340,11 @@ public void TestAdvancedAsync(bool passCreds, bool kitchenSink)
             AdvancedInsightsAsyncResponse response;
             if (passCreds)
             {
-                response = client.NumberInsightClient.GetNumberInsightAsync(request, creds);
+                response = await client.NumberInsightClient.GetNumberInsightAsyncAsync(request, creds);
             }
             else
             {
-                response = client.NumberInsightClient.GetNumberInsightAsync(request);
+                response = await client.NumberInsightClient.GetNumberInsightAsyncAsync(request);
             }
 
             //ASSERT
@@ -356,7 +356,7 @@ public void TestAdvancedAsync(bool passCreds, bool kitchenSink)
         }
 
         [Fact]
-        public void TestFailedAsyncRequest()
+        public async Task TestFailedAsyncRequest()
         {
             //ARRANGE
             var expectedResponse = @"{
@@ -370,7 +370,7 @@ public void TestFailedAsyncRequest()
             var client = new VonageClient(creds);
             try
             {
-                client.NumberInsightClient.GetNumberInsightAsync(request);
+                await client.NumberInsightClient.GetNumberInsightAsyncAsync(request);
                 //ASSERT
                 Assert.True(false, "Auto fail because request returned without throwing exception");
             }
@@ -382,7 +382,7 @@ public void TestFailedAsyncRequest()
         }
 
         [Fact]
-        public void TestFailedAdvancedRequest()
+        public async Task TestFailedAdvancedRequest()
         {
             //ARRANGE
             var expectedResponse = @"{
@@ -397,7 +397,7 @@ public void TestFailedAdvancedRequest()
             var client = new VonageClient(creds);
             try
             {
-                client.NumberInsightClient.GetNumberInsightAdvanced(request);
+                await client.NumberInsightClient.GetNumberInsightAdvancedAsync(request);
                 //ASSERT
                 Assert.True(false, "Auto fail because request returned without throwing exception");
             }
diff --git a/Vonage.Test.Unit/NumbersTests.cs b/Vonage.Test.Unit/NumbersTests.cs
index bb3bdf926..6b5180325 100644
--- a/Vonage.Test.Unit/NumbersTests.cs
+++ b/Vonage.Test.Unit/NumbersTests.cs
@@ -13,7 +13,7 @@ public class NumbersTests : TestBase
         [Theory]
         [InlineData(true,true)]
         [InlineData(false,false)]
-        public void TestSearchNumbers(bool passCreds, bool kitchenSink)
+        public async Task TestSearchNumbers(bool passCreds, bool kitchenSink)
         {
             var expetedResponse = @"{
               ""count"": 1234,
@@ -49,11 +49,11 @@ public void TestSearchNumbers(bool passCreds, bool kitchenSink)
             NumbersSearchResponse response;
             if (passCreds)
             {
-                response = client.NumbersClient.GetAvailableNumbers(request, creds);
+                response = await client.NumbersClient.GetAvailableNumbersAsync(request, creds);
             }
             else
             {
-                response = client.NumbersClient.GetAvailableNumbers(request);
+                response = await client.NumbersClient.GetAvailableNumbersAsync(request);
             }
 
             var number = response.Numbers[0];
@@ -69,7 +69,7 @@ public void TestSearchNumbers(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true,true)]
         [InlineData(false,false)]
-        public void TestBuyNumber(bool passCreds, bool kitchenSink)
+        public async Task TestBuyNumber(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
               ""error-code"": ""200"",
@@ -97,11 +97,11 @@ public void TestBuyNumber(bool passCreds, bool kitchenSink)
             NumberTransactionResponse response;
             if (passCreds)
             {
-                response = client.NumbersClient.BuyANumber(request, creds);
+                response = await client.NumbersClient.BuyANumberAsync(request, creds);
             }
             else
             {
-                response = client.NumbersClient.BuyANumber(request);
+                response = await client.NumbersClient.BuyANumberAsync(request);
             }
             
             Assert.Equal("200",response.ErrorCode);
@@ -111,7 +111,7 @@ public void TestBuyNumber(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void TestCancelNumber(bool passCreds, bool kitchenSink)
+        public async Task TestCancelNumber(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
               ""error-code"": ""200"",
@@ -139,11 +139,11 @@ public void TestCancelNumber(bool passCreds, bool kitchenSink)
             NumberTransactionResponse response;
             if (passCreds)
             {
-                response = client.NumbersClient.CancelANumber(request, creds);
+                response = await client.NumbersClient.CancelANumberAsync(request, creds);
             }
             else
             {
-                response = client.NumbersClient.CancelANumber(request);
+                response = await client.NumbersClient.CancelANumberAsync(request);
             }
 
             Assert.Equal("200", response.ErrorCode);
@@ -153,7 +153,7 @@ public void TestCancelNumber(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true,true)]
         [InlineData(false,false)]
-        public void TestUpdateNumber(bool passCreds, bool kitchenSink)
+        public async Task TestUpdateNumber(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
               ""error-code"": ""200"",
@@ -193,11 +193,11 @@ public void TestUpdateNumber(bool passCreds, bool kitchenSink)
             NumberTransactionResponse response;
             if (passCreds)
             {
-                response = client.NumbersClient.UpdateANumber(request, creds);
+                response = await client.NumbersClient.UpdateANumberAsync(request, creds);
             }
             else
             {
-                response = client.NumbersClient.UpdateANumber(request);
+                response = await client.NumbersClient.UpdateANumberAsync(request);
             }
 
             Assert.Equal("200", response.ErrorCode);
@@ -205,7 +205,7 @@ public void TestUpdateNumber(bool passCreds, bool kitchenSink)
         }
 
         [Fact]
-        public void TestFailedPurchase()
+        public async Task TestFailedPurchase()
         {
             var expectedResponse = @"{
               ""error-code"": ""401"",
@@ -219,7 +219,7 @@ public void TestFailedPurchase()
             var client = new VonageClient(creds);
             try
             {
-                client.NumbersClient.BuyANumber(request);
+                await client.NumbersClient.BuyANumberAsync(request);
                 Assert.True(false, "Failin because exception was not thrown");
             }
             catch (VonageNumberResponseException ex)
diff --git a/Vonage.Test.Unit/PricingTests.cs b/Vonage.Test.Unit/PricingTests.cs
index 57fb9ce81..e91f8d5d8 100644
--- a/Vonage.Test.Unit/PricingTests.cs
+++ b/Vonage.Test.Unit/PricingTests.cs
@@ -11,7 +11,7 @@ public class PricingTests : TestBase
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void GetPricingForCountry(bool passCreds)
+        public async Task GetPricingForCountry(bool passCreds)
         {
             //ARRANGE
             var expectedUri = $"{RestUrl}/account/get-pricing/outbound/sms?country=CA&api_key={ApiKey}&api_secret={ApiSecret}&";
@@ -43,11 +43,11 @@ public void GetPricingForCountry(bool passCreds)
 
             if (passCreds)
             {
-                country = client.PricingClient.RetrievePricingCountry("sms", new Pricing.PricingCountryRequest { Country = "CA" }, creds);
+                country = await client.PricingClient.RetrievePricingCountryAsync("sms", new Pricing.PricingCountryRequest { Country = "CA" }, creds);
             }
             else
             {
-                country = client.PricingClient.RetrievePricingCountry("sms", new Pricing.PricingCountryRequest { Country = "CA" });
+                country = await client.PricingClient.RetrievePricingCountryAsync("sms", new Pricing.PricingCountryRequest { Country = "CA" });
             }
 
             //ASSERT
@@ -70,7 +70,7 @@ public void GetPricingForCountry(bool passCreds)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void GetPricingForPrefix(bool passCreds)
+        public async Task GetPricingForPrefix(bool passCreds)
         {
             //ARRANGE
             var expectedUri = $"{RestUrl}/account/get-prefix-pricing/outbound/sms?prefix=1&api_key={ApiKey}&api_secret={ApiSecret}&";
@@ -105,11 +105,11 @@ public void GetPricingForPrefix(bool passCreds)
             Pricing.PricingResult pricing;
             if (passCreds)
             {
-                pricing = client.PricingClient.RetrievePrefixPricing("sms", new Pricing.PricingPrefixRequest { Prefix = "1" }, creds);
+                pricing = await client.PricingClient.RetrievePrefixPricingAsync("sms", new Pricing.PricingPrefixRequest { Prefix = "1" }, creds);
             }
             else
             {
-                pricing = client.PricingClient.RetrievePrefixPricing("sms", new Pricing.PricingPrefixRequest { Prefix = "1" });
+                pricing = await client.PricingClient.RetrievePrefixPricingAsync("sms", new Pricing.PricingPrefixRequest { Prefix = "1" });
             }
 
             //ASSERT
@@ -131,7 +131,7 @@ public void GetPricingForPrefix(bool passCreds)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void GetPricingAllCountries(bool passCreds)
+        public async Task GetPricingAllCountries(bool passCreds)
         {
             //ARRANGE
             var expectedUri = $"{RestUrl}/account/get-pricing/outbound/sms?api_key={ApiKey}&api_secret={ApiSecret}&";
@@ -166,11 +166,11 @@ public void GetPricingAllCountries(bool passCreds)
             Pricing.PricingResult pricing;
             if (passCreds)
             {
-                pricing = client.PricingClient.RetrievePricingAllCountries("sms",creds);
+                pricing = await client.PricingClient.RetrievePricingAllCountriesAsync("sms",creds);
             }
             else
             {
-                pricing = client.PricingClient.RetrievePricingAllCountries("sms");
+                pricing = await client.PricingClient.RetrievePricingAllCountriesAsync("sms");
             }
 
             //ASSERT
diff --git a/Vonage.Test.Unit/VerifyTest.cs b/Vonage.Test.Unit/VerifyTest.cs
index d47fcb420..d26041a9f 100644
--- a/Vonage.Test.Unit/VerifyTest.cs
+++ b/Vonage.Test.Unit/VerifyTest.cs
@@ -13,7 +13,7 @@ public class VerifyTest : TestBase
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void RequestVerification(bool passCreds, bool kitchenSink)
+        public async Task RequestVerification(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
               ""request_id"": ""abcdef0123456789abcdef0123456789"",
@@ -44,11 +44,11 @@ public void RequestVerification(bool passCreds, bool kitchenSink)
             VerifyResponse response;
             if (passCreds)
             {
-                response = client.VerifyClient.VerifyRequest(request, creds);
+                response = await client.VerifyClient.VerifyRequestAsync(request, creds);
             }
             else
             {
-                response = client.VerifyClient.VerifyRequest(request);
+                response = await client.VerifyClient.VerifyRequestAsync(request);
             }
 
             Assert.Equal("abcdef0123456789abcdef0123456789", response.RequestId);
@@ -58,7 +58,7 @@ public void RequestVerification(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void TestCheckVerification(bool passCreds, bool kitchenSink)
+        public async Task TestCheckVerification(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
               ""request_id"": ""abcdef0123456789abcdef0123456789"",
@@ -87,11 +87,11 @@ public void TestCheckVerification(bool passCreds, bool kitchenSink)
             VerifyCheckResponse response;
             if (passCreds)
             {
-                response = client.VerifyClient.VerifyCheck(request, creds);
+                response = await client.VerifyClient.VerifyCheckAsync(request, creds);
             }
             else
             {
-                response = client.VerifyClient.VerifyCheck(request);
+                response = await client.VerifyClient.VerifyCheckAsync(request);
             }
             Assert.Equal("0.10000000", response.Price);
             Assert.Equal("0.03330000", response.EstimatedPriceMessagesSent);
@@ -104,7 +104,7 @@ public void TestCheckVerification(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
-        public void TestVerifySearch(bool passCreds)
+        public async Task TestVerifySearch(bool passCreds)
         {
             var expectedResponse = @"{
               ""request_id"": ""abcdef0123456789abcdef0123456789"",
@@ -142,11 +142,11 @@ public void TestVerifySearch(bool passCreds)
             VerifySearchResponse response;
             if (passCreds)
             {
-                response = client.VerifyClient.VerifySearch(request, creds);
+                response = await client.VerifyClient.VerifySearchAsync(request, creds);
             }
             else
             {
-                response = client.VerifyClient.VerifySearch(request);
+                response = await client.VerifyClient.VerifySearchAsync(request);
             }
 
             var req = response;
@@ -173,7 +173,7 @@ public void TestVerifySearch(bool passCreds)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void TestControlVerify(bool passCreds)
+        public async Task TestControlVerify(bool passCreds)
         {
             var expectedResponse = @"{
               ""status"": ""0"",
@@ -190,18 +190,18 @@ public void TestControlVerify(bool passCreds)
             VerifyControlResponse response;
             if (passCreds)
             {
-                response = client.VerifyClient.VerifyControl(request, creds);
+                response = await client.VerifyClient.VerifyControlAsync(request, creds);
             }
             else
             {
-                response = client.VerifyClient.VerifyControl(request, creds);
+                response = await client.VerifyClient.VerifyControlAsync(request, creds);
             }
             Assert.Equal("0", response.Status);
             Assert.Equal("cancel", response.Command);
         }
 
         [Fact]
-        public void TestControlVerifyInvalidCredentials()
+        public async Task TestControlVerifyInvalidCredentials()
         {
             var expectedResponse = @"{
               ""status"": ""4"",
@@ -217,7 +217,7 @@ public void TestControlVerifyInvalidCredentials()
             var client = new VonageClient(creds);
             try
             {
-                var response = client.VerifyClient.VerifyControl(request, creds);
+                var response = await client.VerifyClient.VerifyControlAsync(request, creds);
                 Assert.True(false, "Automatically failing because exception wasn't thrown");
             }            
             catch(VonageVerifyResponseException ex)
@@ -230,7 +230,7 @@ public void TestControlVerifyInvalidCredentials()
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void Psd2Verification(bool passCreds, bool kitchenSink)
+        public async Task Psd2Verification(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
               ""request_id"": ""abcdef0123456789abcdef0123456789"",
@@ -261,11 +261,11 @@ public void Psd2Verification(bool passCreds, bool kitchenSink)
             VerifyResponse response;
             if (passCreds)
             {
-                response = client.VerifyClient.VerifyRequestWithPSD2(request, creds);
+                response = await client.VerifyClient.VerifyRequestWithPSD2Async(request, creds);
             }
             else
             {
-                response = client.VerifyClient.VerifyRequestWithPSD2(request);
+                response = await client.VerifyClient.VerifyRequestWithPSD2Async(request);
             }
 
             Assert.Equal("abcdef0123456789abcdef0123456789", response.RequestId);
diff --git a/Vonage.Test.Unit/VoiceClientTests.cs b/Vonage.Test.Unit/VoiceClientTests.cs
index eaf8909e5..5d4958d4b 100644
--- a/Vonage.Test.Unit/VoiceClientTests.cs
+++ b/Vonage.Test.Unit/VoiceClientTests.cs
@@ -15,7 +15,7 @@ public class VoiceClientTests : TestBase
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void CreateCall(bool passCreds)
+        public async Task CreateCall(bool passCreds)
         {
             var expectedUri = "https://api.nexmo.com/v1/calls/";
             var expectedResponse = @"{
@@ -57,11 +57,11 @@ public void CreateCall(bool passCreds)
             CallResponse response;
             if (passCreds)
             {
-                response = client.VoiceClient.CreateCall(request, creds);
+                response = await client.VoiceClient.CreateCallAsync(request, creds);
             }
             else
             {
-                response = client.VoiceClient.CreateCall(request);
+                response = await client.VoiceClient.CreateCallAsync(request);
             }
             Assert.Equal("63f61863-4a51-4f6b-86e1-46edebcf9356", response.Uuid);
             Assert.Equal("CON-f972836a-550f-45fa-956c-12a2ab5b7d22", response.ConversationUuid);
@@ -72,7 +72,7 @@ public void CreateCall(bool passCreds)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]        
-        public void TestListCalls(bool passCreds, bool kitchenSink)
+        public async Task TestListCalls(bool passCreds, bool kitchenSink)
         {
             var expectedResponse = @"{
                   ""count"": 100,
@@ -148,11 +148,11 @@ public void TestListCalls(bool passCreds, bool kitchenSink)
             Common.PageResponse<CallList> callList;
             if (passCreds)
             {
-                callList = client.VoiceClient.GetCalls(filter, creds);
+                callList = await client.VoiceClient.GetCallsAsync(filter, creds);
             }
             else
             {
-                callList = client.VoiceClient.GetCalls(filter);
+                callList = await client.VoiceClient.GetCallsAsync(filter);
             }
 
             var callRecord = callList.Embedded.Calls[0];
@@ -182,7 +182,7 @@ public void TestListCalls(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void TestGetSpecificCall(bool passCreds)
+        public async Task TestGetSpecificCall(bool passCreds)
         {
             var uuid = "63f61863-4a51-4f6b-86e1-46edebcf9356";
             var expectedResponse = @"{
@@ -224,11 +224,11 @@ public void TestGetSpecificCall(bool passCreds)
             CallRecord callRecord;
             if (passCreds)
             {
-                callRecord = client.VoiceClient.GetCall(uuid, creds);
+                callRecord = await client.VoiceClient.GetCallAsync(uuid, creds);
             }
             else
             {
-                callRecord = client.VoiceClient.GetCall(uuid);
+                callRecord = await client.VoiceClient.GetCallAsync(uuid);
             }            
             
             Assert.Equal("63f61863-4a51-4f6b-86e1-46edebcf9356", callRecord.Uuid);
@@ -253,7 +253,7 @@ public void TestGetSpecificCall(bool passCreds)
         [InlineData(true, true, true)]
         [InlineData(false, false, true )]
         [InlineData(false, false, false)]
-        public void TestUpdateCall(bool passCreds, bool inlineNcco, bool testTransfer)
+        public async Task TestUpdateCall(bool passCreds, bool inlineNcco, bool testTransfer)
         {
             var uuid = "63f61863-4a51-4f6b-86e1-46edebcf9356";
             var expectedUri = $"{ApiUrl}/v1/calls/{uuid}";
@@ -286,11 +286,11 @@ public void TestUpdateCall(bool passCreds, bool inlineNcco, bool testTransfer)
             var client = new VonageClient(creds);
             if (passCreds)
             {
-                response = client.VoiceClient.UpdateCall(uuid, request, creds);
+                response = await client.VoiceClient.UpdateCallAsync(uuid, request, creds);
             }
             else
             {
-                response = client.VoiceClient.UpdateCall(uuid, request);
+                response = await client.VoiceClient.UpdateCallAsync(uuid, request);
             }
             Assert.True(response);
         }
@@ -298,7 +298,7 @@ public void TestUpdateCall(bool passCreds, bool inlineNcco, bool testTransfer)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void TestStartStream(bool passCreds, bool kitchenSink)
+        public async Task TestStartStream(bool passCreds, bool kitchenSink)
         {
             var uuid = "63f61863-4a51-4f6b-86e1-46edebcf9356";
             var expectedUri = $"{ApiUrl}/v1/calls/{uuid}/stream";
@@ -334,11 +334,11 @@ public void TestStartStream(bool passCreds, bool kitchenSink)
             CallCommandResponse response;
             if (passCreds)
             {
-                response = client.VoiceClient.StartStream(uuid,command, creds);
+                response = await client.VoiceClient.StartStreamAsync(uuid,command, creds);
             }
             else
             {
-                response = client.VoiceClient.StartStream(uuid, command);
+                response = await client.VoiceClient.StartStreamAsync(uuid, command);
             }
             Assert.Equal("Stream started", response.Message);
             Assert.Equal(uuid, response.Uuid);
@@ -347,7 +347,7 @@ public void TestStartStream(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void StopStream(bool passCreds)
+        public async Task StopStream(bool passCreds)
         {
             var uuid = "63f61863-4a51-4f6b-86e1-46edebcf9356";
             var expectedUri = $"{ApiUrl}/v1/calls/{uuid}/stream";
@@ -364,11 +364,11 @@ public void StopStream(bool passCreds)
             CallCommandResponse response;
             if (passCreds)
             {
-                response = client.VoiceClient.StopStream(uuid, creds);
+                response = await client.VoiceClient.StopStreamAsync(uuid, creds);
             }
             else
             {
-                response = client.VoiceClient.StopStream(uuid);
+                response = await client.VoiceClient.StopStreamAsync(uuid);
             }
             Assert.Equal("Stream stopped", response.Message);
             Assert.Equal(uuid, response.Uuid);
@@ -377,7 +377,7 @@ public void StopStream(bool passCreds)
         [Theory]
         [InlineData(true, true)]
         [InlineData(false, false)]
-        public void TestStartTalk(bool passCreds, bool kitchenSink)
+        public async Task TestStartTalk(bool passCreds, bool kitchenSink)
         {
             var uuid = "63f61863-4a51-4f6b-86e1-46edebcf9356";
             var expectedUri = $"{ApiUrl}/v1/calls/{uuid}/talk";
@@ -414,11 +414,11 @@ public void TestStartTalk(bool passCreds, bool kitchenSink)
             CallCommandResponse response;
             if (passCreds)
             {
-                response = client.VoiceClient.StartTalk(uuid, command, creds);
+                response = await client.VoiceClient.StartTalkAsync(uuid, command, creds);
             }
             else
             {
-                response = client.VoiceClient.StartTalk(uuid, command);
+                response = await client.VoiceClient.StartTalkAsync(uuid, command);
             }
             Assert.Equal("Talk started", response.Message);
             Assert.Equal(uuid, response.Uuid);
@@ -427,7 +427,7 @@ public void TestStartTalk(bool passCreds, bool kitchenSink)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void StopTalk(bool passCreds)
+        public async Task StopTalk(bool passCreds)
         {
             var uuid = "63f61863-4a51-4f6b-86e1-46edebcf9356";
             var expectedUri = $"{ApiUrl}/v1/calls/{uuid}/talk";
@@ -444,11 +444,11 @@ public void StopTalk(bool passCreds)
             CallCommandResponse response;
             if (passCreds)
             {
-                response = client.VoiceClient.StopStream(uuid, creds);
+                response = await client.VoiceClient.StopStreamAsync(uuid, creds);
             }
             else
             {
-                response = client.VoiceClient.StopStream(uuid);
+                response = await client.VoiceClient.StopStreamAsync(uuid);
             }
             Assert.Equal("Talk stopped", response.Message);
             Assert.Equal(uuid, response.Uuid);
@@ -457,7 +457,7 @@ public void StopTalk(bool passCreds)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void TestStartDtmf(bool passCreds)
+        public async Task TestStartDtmf(bool passCreds)
         {
             var uuid = "63f61863-4a51-4f6b-86e1-46edebcf9356";
             var expectedUri = $"{ApiUrl}/v1/calls/{uuid}/talk";
@@ -475,11 +475,11 @@ public void TestStartDtmf(bool passCreds)
             CallCommandResponse response;
             if (passCreds)
             {
-                response = client.VoiceClient.StartDtmf(uuid, command, creds);
+                response = await client.VoiceClient.StartDtmfAsync(uuid, command, creds);
             }
             else
             {
-                response = client.VoiceClient.StartDtmf(uuid, command);
+                response = await client.VoiceClient.StartDtmfAsync(uuid, command);
             }
             Assert.Equal("DTMF sent", response.Message);
             Assert.Equal(uuid, response.Uuid);
@@ -488,7 +488,7 @@ public void TestStartDtmf(bool passCreds)
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
-        public void TestGetRecordings(bool passCreds)
+        public async Task TestGetRecordings(bool passCreds)
         {
             var expectedUri = $"{ApiUrl}/v1/calls/63f61863-4a51-4f6b-86e1-46edebcf9356";
             var creds = Request.Credentials.FromAppIdAndPrivateKey(AppId, PrivateKey);
@@ -499,11 +499,11 @@ public void TestGetRecordings(bool passCreds)
             GetRecordingResponse response;
             if (passCreds) 
             {
-                response = client.VoiceClient.GetRecording(expectedUri, creds);
+                response = await client.VoiceClient.GetRecordingAsync(expectedUri, creds);
             }
             else
             {
-                response = client.VoiceClient.GetRecording(expectedUri);
+                response = await client.VoiceClient.GetRecordingAsync(expectedUri);
             }
 
 
@@ -512,7 +512,7 @@ public void TestGetRecordings(bool passCreds)
         }
 
         [Fact]
-        public void CreateCallWithUnicodeCharecters()
+        public async Task CreateCallWithUnicodeCharecters()
         {
             var expectedUri = "https://api.nexmo.com/v1/calls/";
             var expectedResponse = @"{
@@ -552,7 +552,7 @@ public void CreateCallWithUnicodeCharecters()
             var creds = Request.Credentials.FromAppIdAndPrivateKey(AppId, PrivateKey);
             var client = new VonageClient(creds);
             CallResponse response;
-            response = client.VoiceClient.CreateCall(request);
+            response = await client.VoiceClient.CreateCallAsync(request);
             Assert.Equal("63f61863-4a51-4f6b-86e1-46edebcf9356", response.Uuid);
             Assert.Equal("CON-f972836a-550f-45fa-956c-12a2ab5b7d22", response.ConversationUuid);
             Assert.Equal("outbound", response.Direction);
diff --git a/Vonage/Accounts/AccountClient.cs b/Vonage/Accounts/AccountClient.cs
index 662cacf72..eaa2ef3cc 100644
--- a/Vonage/Accounts/AccountClient.cs
+++ b/Vonage/Accounts/AccountClient.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Accounts
@@ -11,18 +12,18 @@ public AccountClient(Credentials creds = null)
             Credentials = creds;
         }
         
-        public Balance GetAccountBalance(Credentials creds = null)
+        public Task<Balance> GetAccountBalanceAsync(Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<Balance>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<Balance>(
                 ApiRequest.GetBaseUriFor(typeof(AccountClient),
                 "/account/get-balance"), 
                 ApiRequest.AuthType.Query, 
                 credentials: creds ?? Credentials);
         }
 
-        public TopUpResult TopUpAccountBalance(TopUpRequest request, Credentials creds = null)
+        public Task<TopUpResult> TopUpAccountBalanceAsync(TopUpRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<TopUpResult>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<TopUpResult>(
                 ApiRequest.GetBaseUriFor(typeof(AccountClient), "/account/top-up"),
                 ApiRequest.AuthType.Query,
                 request,
@@ -30,9 +31,9 @@ public TopUpResult TopUpAccountBalance(TopUpRequest request, Credentials creds =
             );
         }
 
-        public AccountSettingsResult ChangeAccountSettings(AccountSettingsRequest request, Credentials creds = null)
+        public Task<AccountSettingsResult> ChangeAccountSettingsAsync(AccountSettingsRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoPostRequestUrlContentFromObject<AccountSettingsResult>
+            return ApiRequest.DoPostRequestUrlContentFromObjectAsync<AccountSettingsResult>
             (
                 ApiRequest.GetBaseUriFor(typeof(AccountClient), "/account/settings"),
                 request,
@@ -40,18 +41,18 @@ public AccountSettingsResult ChangeAccountSettings(AccountSettingsRequest reques
             );
         }
 
-        public SecretsRequestResult RetrieveApiSecrets(string apiKey, Credentials creds = null)
+        public Task<SecretsRequestResult> RetrieveApiSecretsAsync(string apiKey, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<SecretsRequestResult>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<SecretsRequestResult>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"/accounts/{apiKey}/secrets"),
                 ApiRequest.AuthType.Basic,
                 credentials: creds ?? Credentials
             );
         }
 
-        public Secret CreateApiSecret(CreateSecretRequest request, string apiKey, Credentials creds = null)
+        public Task<Secret> CreateApiSecretAsync(CreateSecretRequest request, string apiKey, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<Secret>(
+            return ApiRequest.DoRequestWithJsonContentAsync<Secret>(
                 "POST",
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"/accounts/{apiKey}/secrets"),
                 request,
@@ -60,18 +61,18 @@ public Secret CreateApiSecret(CreateSecretRequest request, string apiKey, Creden
             );
         }
 
-        public Secret RetrieveApiSecret(string secretId, string apiKey, Credentials creds = null)
+        public Task<Secret> RetrieveApiSecretAsync(string secretId, string apiKey, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<Secret>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<Secret>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"/accounts/{apiKey}/secrets/{secretId}"),
                 ApiRequest.AuthType.Basic,
                 credentials: creds ?? Credentials
             );
         }
 
-        public bool RevokeApiSecret(string secretId, string apiKey, Credentials creds = null)
+        public async Task<bool> RevokeApiSecretAsync(string secretId, string apiKey, Credentials creds = null)
         {
-            ApiRequest.DoDeleteRequestWithUrlContent(
+            await ApiRequest.DoDeleteRequestWithUrlContentAsync(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"/accounts/{apiKey}/secrets/{secretId}"),
                 null,
                 ApiRequest.AuthType.Basic,
diff --git a/Vonage/Accounts/IAccountClient.cs b/Vonage/Accounts/IAccountClient.cs
index 832c4c619..8f209194d 100644
--- a/Vonage/Accounts/IAccountClient.cs
+++ b/Vonage/Accounts/IAccountClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Accounts
@@ -9,7 +10,7 @@ public interface IAccountClient
         /// </summary>
         /// <param name="creds"></param>
         /// <returns></returns>
-        Balance GetAccountBalance(Credentials creds = null);
+        Task<Balance> GetAccountBalanceAsync(Credentials creds = null);
 
         /// <summary>
         /// You can top up your account using this API when you have enabled auto-reload in the dashboard. 
@@ -21,7 +22,7 @@ public interface IAccountClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        TopUpResult TopUpAccountBalance(TopUpRequest request, Credentials creds = null);
+        Task<TopUpResult> TopUpAccountBalanceAsync(TopUpRequest request, Credentials creds = null);
 
         /// <summary>
         /// Update the default callback URLs (where the webhooks are sent to) associated with your account: 
@@ -31,7 +32,7 @@ public interface IAccountClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        AccountSettingsResult ChangeAccountSettings(AccountSettingsRequest request, Credentials creds = null);
+        Task<AccountSettingsResult> ChangeAccountSettingsAsync(AccountSettingsRequest request, Credentials creds = null);
 
         /// <summary>
         /// Many of Vonage's APIs are accessed using an API key and secret. It is recommended that you change or "rotate" 
@@ -42,7 +43,7 @@ public interface IAccountClient
         /// <param name="apiKey"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        SecretsRequestResult RetrieveApiSecrets(string apiKey=null, Credentials creds = null);
+        Task<SecretsRequestResult> RetrieveApiSecretsAsync(string apiKey=null, Credentials creds = null);
 
         /// <summary>
         /// Createse an API Secret
@@ -51,7 +52,7 @@ public interface IAccountClient
         /// <param name="apiKey">The Api Key to create a secret for</param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        Secret CreateApiSecret(CreateSecretRequest request, string apiKey=null, Credentials creds = null);
+        Task<Secret> CreateApiSecretAsync(CreateSecretRequest request, string apiKey=null, Credentials creds = null);
 
         /// <summary>
         /// retrieves info about an api secret at the given id
@@ -60,7 +61,7 @@ public interface IAccountClient
         /// <param name="apiKey">Api Key the secret is for</param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        Secret RetrieveApiSecret(string secretId, string apiKey=null, Credentials creds = null);
+        Task<Secret> RetrieveApiSecretAsync(string secretId, string apiKey=null, Credentials creds = null);
 
         /// <summary>
         /// Deletes an Api Secret
@@ -69,6 +70,6 @@ public interface IAccountClient
         /// <param name="apiKey">the api key the secret is for</param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        bool RevokeApiSecret(string secretId, string apiKey=null, Credentials creds = null);
+        Task<bool> RevokeApiSecretAsync(string secretId, string apiKey=null, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Applications/ApplicationClient.cs b/Vonage/Applications/ApplicationClient.cs
index 690f37931..05eb41969 100644
--- a/Vonage/Applications/ApplicationClient.cs
+++ b/Vonage/Applications/ApplicationClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Applications
@@ -9,9 +10,9 @@ public ApplicationClient(Credentials creds = null)
         {
             Credentials = creds;
         }
-        public Application CreateApplicaiton(CreateApplicationRequest request, Credentials creds = null)
+        public Task<Application> CreateApplicaitonAsync(CreateApplicationRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<Application>(
+            return ApiRequest.DoRequestWithJsonContentAsync<Application>(
                 "POST",
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/v2/applications"),
                 request,
@@ -20,9 +21,9 @@ public Application CreateApplicaiton(CreateApplicationRequest request, Credentia
             );
         }
 
-        public ApplicationPage ListApplications(ListApplicationsRequest request, Credentials creds = null)
+        public Task<ApplicationPage> ListApplicationsAsync(ListApplicationsRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<ApplicationPage>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<ApplicationPage>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/v2/applications"),
                 ApiRequest.AuthType.Basic,
                 request,
@@ -30,18 +31,18 @@ public ApplicationPage ListApplications(ListApplicationsRequest request, Credent
             );
         }
 
-        public Application GetApplication(string id, Credentials creds = null)
+        public Task<Application> GetApplicationAsync(string id, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<Application>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<Application>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"/v2/applications/{id}"),
                 ApiRequest.AuthType.Basic,
                 credentials: creds ?? Credentials
             );
         }
 
-        public Application UpdateApplication(string id, CreateApplicationRequest request, Credentials creds = null)
+        public Task<Application> UpdateApplicationAsync(string id, CreateApplicationRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<Application>(
+            return ApiRequest.DoRequestWithJsonContentAsync<Application>(
                 "PUT",
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"/v2/applications/{id}"),
                 request,
@@ -50,9 +51,9 @@ public Application UpdateApplication(string id, CreateApplicationRequest request
             );
         }
 
-        public bool DeleteApplication(string id, Credentials creds = null)
+        public async Task<bool> DeleteApplicationAsync(string id, Credentials creds = null)
         {
-            ApiRequest.DoDeleteRequestWithUrlContent(
+            await ApiRequest.DoDeleteRequestWithUrlContentAsync(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"/v2/applications/{id}"),
                 null,
                 ApiRequest.AuthType.Basic,
diff --git a/Vonage/Applications/IApplicationClient.cs b/Vonage/Applications/IApplicationClient.cs
index f78016ffb..39a19859b 100644
--- a/Vonage/Applications/IApplicationClient.cs
+++ b/Vonage/Applications/IApplicationClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Applications
@@ -10,7 +11,7 @@ public interface IApplicationClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        Application CreateApplicaiton(CreateApplicationRequest request, Credentials creds = null);
+        Task<Application> CreateApplicaitonAsync(CreateApplicationRequest request, Credentials creds = null);
 
         /// <summary>
         /// List applications
@@ -18,7 +19,7 @@ public interface IApplicationClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        ApplicationPage ListApplications(ListApplicationsRequest request, Credentials creds = null);
+        Task<ApplicationPage> ListApplicationsAsync(ListApplicationsRequest request, Credentials creds = null);
 
         /// <summary>
         /// Retrieves information about an application
@@ -26,7 +27,7 @@ public interface IApplicationClient
         /// <param name="id">Id of the application to be retrieved</param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        Application GetApplication(string id, Credentials creds = null);
+        Task<Application> GetApplicationAsync(string id, Credentials creds = null);
 
         /// <summary>
         /// Updates an Application
@@ -35,7 +36,7 @@ public interface IApplicationClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        Application UpdateApplication(string id, CreateApplicationRequest request, Credentials creds = null);
+        Task<Application> UpdateApplicationAsync(string id, CreateApplicationRequest request, Credentials creds = null);
 
         /// <summary>
         /// Deletes an application: Cannot be undone
@@ -43,6 +44,6 @@ public interface IApplicationClient
         /// <param name="id">Id of the application to be deleted</param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        bool DeleteApplication(string id, Credentials creds = null);
+        Task <bool> DeleteApplicationAsync(string id, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Conversions/ConversionClient.cs b/Vonage/Conversions/ConversionClient.cs
index 95874e371..616e641f5 100644
--- a/Vonage/Conversions/ConversionClient.cs
+++ b/Vonage/Conversions/ConversionClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Conversions
@@ -10,9 +11,9 @@ public ConversionClient(Credentials creds = null)
         {
             Credentials = creds;
         }
-        public bool SmsConversion(ConversionRequest request, Credentials creds = null)
+        public async Task<bool> SmsConversionAsync(ConversionRequest request, Credentials creds = null)
         {
-            ApiRequest.DoPostRequestUrlContentFromObject<object>
+            await ApiRequest.DoPostRequestUrlContentFromObjectAsync<object>
             (
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/conversions/sms"),
                 request,
@@ -21,9 +22,9 @@ public bool SmsConversion(ConversionRequest request, Credentials creds = null)
             return true;
         }
 
-        public bool VoiceConversion(ConversionRequest request, Credentials creds = null)
+        public async Task<bool> VoiceConversionAsync(ConversionRequest request, Credentials creds = null)
         {
-            ApiRequest.DoPostRequestUrlContentFromObject<object>
+            await ApiRequest.DoPostRequestUrlContentFromObjectAsync<object>
             (
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/conversions/voice"),
                 request,
diff --git a/Vonage/Conversions/IConversionClient.cs b/Vonage/Conversions/IConversionClient.cs
index e26212016..cb502ab52 100644
--- a/Vonage/Conversions/IConversionClient.cs
+++ b/Vonage/Conversions/IConversionClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Conversions
@@ -11,7 +12,7 @@ public interface IConversionClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        bool SmsConversion(ConversionRequest request, Credentials creds = null);
+        Task<bool> SmsConversionAsync(ConversionRequest request, Credentials creds = null);
         /// <summary>
         /// Send a Conversion API request with information about the Call or Text-To-Speech identified by message-id. 
         /// Vonage uses your conversion data and internal information about message-id to help improve our routing of messages in the future.
@@ -19,6 +20,6 @@ public interface IConversionClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        bool VoiceConversion(ConversionRequest request, Credentials creds = null);
+        Task<bool> VoiceConversionAsync(ConversionRequest request, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Messaging/ISmsClient.cs b/Vonage/Messaging/ISmsClient.cs
index 4b7ada8c2..3a73b9ecd 100644
--- a/Vonage/Messaging/ISmsClient.cs
+++ b/Vonage/Messaging/ISmsClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Messaging
@@ -10,6 +11,6 @@ public interface ISmsClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        SendSmsResponse SendAnSms(SendSmsRequest request, Credentials creds = null);
+        Task<SendSmsResponse> SendAnSmsAsync(SendSmsRequest request, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Messaging/SmsClient.cs b/Vonage/Messaging/SmsClient.cs
index 45914e034..a9b7b313b 100644
--- a/Vonage/Messaging/SmsClient.cs
+++ b/Vonage/Messaging/SmsClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Messaging
@@ -18,9 +19,9 @@ public SmsClient(Credentials creds = null)
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageSmsResponseException">Thrown when the status of a message is non-zero or response is empty</exception>
         /// <returns></returns>
-        public SendSmsResponse SendAnSms(SendSmsRequest request, Credentials creds = null)
+        public async Task<SendSmsResponse> SendAnSmsAsync(SendSmsRequest request, Credentials creds = null)
         {
-            var result = ApiRequest.DoPostRequestUrlContentFromObject<SendSmsResponse>(
+            var result = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<SendSmsResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/sms/json"),
                 request,
                 creds ?? Credentials
diff --git a/Vonage/NumberInsights/INumberInsightClient.cs b/Vonage/NumberInsights/INumberInsightClient.cs
index 34a157ee9..696bc7f64 100644
--- a/Vonage/NumberInsights/INumberInsightClient.cs
+++ b/Vonage/NumberInsights/INumberInsightClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.NumberInsights
@@ -10,7 +11,7 @@ public interface INumberInsightClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        BasicInsightResponse GetNumberInsightBasic(BasicNumberInsightRequest request, Credentials creds = null);
+        Task<BasicInsightResponse> GetNumberInsightBasicAsync(BasicNumberInsightRequest request, Credentials creds = null);
 
         /// <summary>
         /// Provides standard number insight information about a number.
@@ -18,8 +19,8 @@ public interface INumberInsightClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        StandardInsightResponse
-            GetNumberInsightStandard(StandardNumberInsightRequest request, Credentials creds = null);
+        Task<StandardInsightResponse>
+            GetNumberInsightStandardAsync(StandardNumberInsightRequest request, Credentials creds = null);
 
         /// <summary>
         /// Provides advanced number insight information about a number synchronously, in the same way that the basic and standard endpoints do.
@@ -28,7 +29,7 @@ public interface INumberInsightClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        AdvancedInsightsResponse GetNumberInsightAdvanced(AdvancedNumberInsightRequest request,
+        Task<AdvancedInsightsResponse> GetNumberInsightAdvancedAsync(AdvancedNumberInsightRequest request,
             Credentials creds = null);
 
         /// <summary>
@@ -38,7 +39,7 @@ AdvancedInsightsResponse GetNumberInsightAdvanced(AdvancedNumberInsightRequest r
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        AdvancedInsightsAsyncResponse GetNumberInsightAsync(AdvancedNumberInsightAsynchronousRequest request,
+        Task<AdvancedInsightsAsyncResponse> GetNumberInsightAsyncAsync(AdvancedNumberInsightAsynchronousRequest request,
             Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/NumberInsights/NumberInsightClient.cs b/Vonage/NumberInsights/NumberInsightClient.cs
index 7e46b0e71..275be8162 100644
--- a/Vonage/NumberInsights/NumberInsightClient.cs
+++ b/Vonage/NumberInsights/NumberInsightClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.NumberInsights
@@ -10,9 +11,9 @@ public NumberInsightClient(Credentials creds = null)
         {
             Credentials = creds;
         }
-        public BasicInsightResponse GetNumberInsightBasic(BasicNumberInsightRequest request, Credentials creds = null)
+        public async Task<BasicInsightResponse> GetNumberInsightBasicAsync(BasicNumberInsightRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoGetRequestWithQueryParameters<BasicInsightResponse>(
+            var response = await ApiRequest.DoGetRequestWithQueryParametersAsync<BasicInsightResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/ni/basic/json"),
                 ApiRequest.AuthType.Query,
                 request,
@@ -22,9 +23,9 @@ public BasicInsightResponse GetNumberInsightBasic(BasicNumberInsightRequest requ
             return response;
         }
 
-        public StandardInsightResponse GetNumberInsightStandard(StandardNumberInsightRequest request, Credentials creds = null)
+        public async Task<StandardInsightResponse> GetNumberInsightStandardAsync(StandardNumberInsightRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoGetRequestWithQueryParameters<StandardInsightResponse>(
+            var response = await ApiRequest.DoGetRequestWithQueryParametersAsync<StandardInsightResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/ni/standard/json"),
                 ApiRequest.AuthType.Query,
                 request,
@@ -34,10 +35,10 @@ public StandardInsightResponse GetNumberInsightStandard(StandardNumberInsightReq
             return response;
         }
 
-        public AdvancedInsightsResponse GetNumberInsightAdvanced(AdvancedNumberInsightRequest request,
+        public async Task<AdvancedInsightsResponse> GetNumberInsightAdvancedAsync(AdvancedNumberInsightRequest request,
             Credentials creds = null)
         {
-            var response = ApiRequest.DoGetRequestWithQueryParameters<AdvancedInsightsResponse>(
+            var response = await ApiRequest.DoGetRequestWithQueryParametersAsync<AdvancedInsightsResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/ni/advanced/json"),
                 ApiRequest.AuthType.Query,
                 request,
@@ -47,9 +48,9 @@ public AdvancedInsightsResponse GetNumberInsightAdvanced(AdvancedNumberInsightRe
             return response;
         }
 
-        public AdvancedInsightsAsyncResponse GetNumberInsightAsync(AdvancedNumberInsightAsynchronousRequest request, Credentials creds = null)
+        public async Task<AdvancedInsightsAsyncResponse> GetNumberInsightAsyncAsync(AdvancedNumberInsightAsynchronousRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoGetRequestWithQueryParameters<AdvancedInsightsAsyncResponse>(
+            var response = await ApiRequest.DoGetRequestWithQueryParametersAsync<AdvancedInsightsAsyncResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/ni/advanced/async/json"),
                 ApiRequest.AuthType.Query,
                 request,
diff --git a/Vonage/Numbers/INumbersClient.cs b/Vonage/Numbers/INumbersClient.cs
index 5ae640a1f..76be75235 100644
--- a/Vonage/Numbers/INumbersClient.cs
+++ b/Vonage/Numbers/INumbersClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Numbers
@@ -10,7 +11,7 @@ public interface INumbersClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        NumbersSearchResponse GetOwnedNumbers(NumberSearchRequest request, Credentials creds = null);
+        Task<NumbersSearchResponse> GetOwnedNumbersAsync(NumberSearchRequest request, Credentials creds = null);
 
         /// <summary>
         /// Retrieve inbound numbers that are available for the specified country.
@@ -18,7 +19,7 @@ public interface INumbersClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        NumbersSearchResponse GetAvailableNumbers(NumberSearchRequest request, Credentials creds = null);
+        Task<NumbersSearchResponse> GetAvailableNumbersAsync(NumberSearchRequest request, Credentials creds = null);
 
         /// <summary>
         /// Request to purchase a specific inbound number.
@@ -26,7 +27,7 @@ public interface INumbersClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        NumberTransactionResponse BuyANumber(NumberTransactionRequest request, Credentials creds = null);
+        Task<NumberTransactionResponse> BuyANumberAsync(NumberTransactionRequest request, Credentials creds = null);
 
         /// <summary>
         /// Cancel your subscription for a specific inbound number.
@@ -34,7 +35,7 @@ public interface INumbersClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        NumberTransactionResponse CancelANumber(NumberTransactionRequest request, Credentials creds = null);
+        Task<NumberTransactionResponse> CancelANumberAsync(NumberTransactionRequest request, Credentials creds = null);
 
         /// <summary>
         /// Change the behaviour of a number that you own.
@@ -42,6 +43,6 @@ public interface INumbersClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        NumberTransactionResponse UpdateANumber(UpdateNumberRequest request, Credentials creds = null);
+        Task<NumberTransactionResponse> UpdateANumberAsync(UpdateNumberRequest request, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Numbers/NumbersClient.cs b/Vonage/Numbers/NumbersClient.cs
index bcc47cd66..0f94a6cdf 100644
--- a/Vonage/Numbers/NumbersClient.cs
+++ b/Vonage/Numbers/NumbersClient.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Numbers
@@ -12,9 +13,9 @@ public NumbersClient(Credentials creds = null)
         
         public Credentials Credentials { get; set; }
         
-        public NumbersSearchResponse GetOwnedNumbers(NumberSearchRequest request, Credentials creds = null)
+        public Task<NumbersSearchResponse> GetOwnedNumbersAsync(NumberSearchRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<NumbersSearchResponse>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<NumbersSearchResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/account/numbers"), 
                 ApiRequest.AuthType.Query, 
                 request, 
@@ -22,9 +23,9 @@ public NumbersSearchResponse GetOwnedNumbers(NumberSearchRequest request, Creden
                 );
         }
 
-        public NumbersSearchResponse GetAvailableNumbers(NumberSearchRequest request, Credentials creds = null)
+        public Task<NumbersSearchResponse> GetAvailableNumbersAsync(NumberSearchRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<NumbersSearchResponse>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<NumbersSearchResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/number/search"), 
                 ApiRequest.AuthType.Query, 
                 request, 
@@ -32,9 +33,9 @@ public NumbersSearchResponse GetAvailableNumbers(NumberSearchRequest request, Cr
             );
         }
 
-        public NumberTransactionResponse BuyANumber(NumberTransactionRequest request, Credentials creds = null)
+        public async Task<NumberTransactionResponse> BuyANumberAsync(NumberTransactionRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoPostRequestUrlContentFromObject<NumberTransactionResponse>(                
+            var response = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<NumberTransactionResponse>(                
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/number/buy"),
                 request,                
                 creds ?? Credentials
@@ -43,9 +44,9 @@ public NumberTransactionResponse BuyANumber(NumberTransactionRequest request, Cr
             return response; 
         }
 
-        public NumberTransactionResponse CancelANumber(NumberTransactionRequest request, Credentials creds = null)
+        public async Task<NumberTransactionResponse> CancelANumberAsync(NumberTransactionRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoPostRequestUrlContentFromObject<NumberTransactionResponse>(                
+            var response = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<NumberTransactionResponse>(                
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/number/cancel"),
                 request,                
                 creds ?? Credentials
@@ -54,9 +55,9 @@ public NumberTransactionResponse CancelANumber(NumberTransactionRequest request,
             return response;
         }
 
-        public NumberTransactionResponse UpdateANumber(UpdateNumberRequest request, Credentials creds = null)
+        public async Task<NumberTransactionResponse> UpdateANumberAsync(UpdateNumberRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoPostRequestUrlContentFromObject<NumberTransactionResponse>(
+            var response = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<NumberTransactionResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/number/update"),
                 request,
                 creds ?? Credentials
diff --git a/Vonage/Pricing/IPricingClient.cs b/Vonage/Pricing/IPricingClient.cs
index 6f197e603..3bc61976c 100644
--- a/Vonage/Pricing/IPricingClient.cs
+++ b/Vonage/Pricing/IPricingClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Pricing
@@ -12,7 +13,7 @@ public interface IPricingClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        Country RetrievePricingCountry(string type, PricingCountryRequest request, Credentials creds = null);
+        Task<Country> RetrievePricingCountryAsync(string type, PricingCountryRequest request, Credentials creds = null);
 
         /// <summary>
         /// Retrieves the pricing information for all countries.
@@ -21,7 +22,7 @@ public interface IPricingClient
         /// either sms, sms-transit or voice.</param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        PricingResult RetrievePricingAllCountries(string type, Credentials creds = null);
+        Task<PricingResult> RetrievePricingAllCountriesAsync(string type, Credentials creds = null);
 
         /// <summary>
         /// Retrieves the pricing information based on the dialing prefix.
@@ -31,6 +32,6 @@ public interface IPricingClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        PricingResult RetrievePrefixPricing(string type, PricingPrefixRequest request, Credentials creds = null);
+        Task<PricingResult> RetrievePrefixPricingAsync(string type, PricingPrefixRequest request, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Pricing/PricingClient.cs b/Vonage/Pricing/PricingClient.cs
index 64c34a8e2..8ec8d5cb7 100644
--- a/Vonage/Pricing/PricingClient.cs
+++ b/Vonage/Pricing/PricingClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Pricing
@@ -11,9 +12,9 @@ public PricingClient(Credentials creds = null)
         
         public Credentials Credentials { get; set; }
         
-        public Country RetrievePricingCountry(string type, PricingCountryRequest request, Credentials creds = null)
+        public Task<Country> RetrievePricingCountryAsync(string type, PricingCountryRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<Country>
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<Country>
             (
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, $"/account/get-pricing/outbound/{type}"),
                 ApiRequest.AuthType.Query,
@@ -22,9 +23,9 @@ public Country RetrievePricingCountry(string type, PricingCountryRequest request
             );
         }
 
-        public PricingResult RetrievePricingAllCountries(string type, Credentials creds = null)
+        public Task<PricingResult> RetrievePricingAllCountriesAsync(string type, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<PricingResult>
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<PricingResult>
             (
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, $"/account/get-pricing/outbound/{type}"),
                 ApiRequest.AuthType.Query,
@@ -32,9 +33,9 @@ public PricingResult RetrievePricingAllCountries(string type, Credentials creds
             );
         }
 
-        public PricingResult RetrievePrefixPricing(string type, PricingPrefixRequest request, Credentials creds = null)
+        public Task<PricingResult> RetrievePrefixPricingAsync(string type, PricingPrefixRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<PricingResult>
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<PricingResult>
             (
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, $"/account/get-prefix-pricing/outbound/{type}"),
                 ApiRequest.AuthType.Query,
diff --git a/Vonage/Redaction/IRedactClient.cs b/Vonage/Redaction/IRedactClient.cs
index 1370edc82..53ee4a1f1 100644
--- a/Vonage/Redaction/IRedactClient.cs
+++ b/Vonage/Redaction/IRedactClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Redaction
@@ -10,6 +11,6 @@ public interface IRedactClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        bool Redact(RedactRequest request, Credentials creds = null);
+        Task<bool> RedactAsync(RedactRequest request, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Redaction/RedactClient.cs b/Vonage/Redaction/RedactClient.cs
index 13227e06d..5887defb5 100644
--- a/Vonage/Redaction/RedactClient.cs
+++ b/Vonage/Redaction/RedactClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Redaction
@@ -12,9 +13,9 @@ public RedactClient(Credentials creds = null)
         }
 
 
-        public bool Redact(RedactRequest request, Credentials creds = null)
+        public async Task<bool> RedactAsync(RedactRequest request, Credentials creds = null)
         {
-            ApiRequest.DoRequestWithJsonContent<object>
+            await ApiRequest.DoRequestWithJsonContentAsync<object>
             (
                 "POST",
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api,"/v1/redact/transaction"),
diff --git a/Vonage/Request/ApiRequest.cs b/Vonage/Request/ApiRequest.cs
index 51d24a6b9..58e199f74 100644
--- a/Vonage/Request/ApiRequest.cs
+++ b/Vonage/Request/ApiRequest.cs
@@ -11,6 +11,7 @@
 using System.Reflection;
 using System.Text;
 using Microsoft.Extensions.Logging;
+using System.Threading.Tasks;
 
 namespace Vonage.Request
 {
@@ -244,13 +245,13 @@ internal static StringBuilder GetQueryStringBuilderFor(object parameters, AuthTy
         /// <param name="parameters">Parameters required by the endpoint (do not include credentials)</param>
         /// <param name="credentials">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">Thrown if the API encounters a non-zero result</exception>
-        public static T DoGetRequestWithQueryParameters<T>(Uri uri, AuthType authType, object parameters = null, Credentials credentials = null)
+        public static async Task<T> DoGetRequestWithQueryParametersAsync<T>(Uri uri, AuthType authType, object parameters = null, Credentials credentials = null)
         {
             if (parameters == null)
                 parameters = new Dictionary<string, string>();
             var sb = GetQueryStringBuilderFor(parameters, authType, credentials);
             var requestUri = new Uri(uri + (sb.Length != 0 ? "?" + sb : ""));
-            return SendGetRequest<T>(requestUri, authType, credentials);
+            return await SendGetRequestAsync<T>(requestUri, authType, credentials);
         }
 
         /// <summary>
@@ -261,7 +262,7 @@ public static T DoGetRequestWithQueryParameters<T>(Uri uri, AuthType authType, o
         /// <param name="authType"></param>
         /// <param name="creds"></param>
         /// <exception cref="VonageHttpRequestException">Thrown if the API encounters a non-zero result</exception>
-        private static T SendGetRequest<T>(Uri uri, AuthType authType, Credentials creds)
+        private static async Task<T> SendGetRequestAsync<T>(Uri uri, AuthType authType, Credentials creds)
         {
             var logger = Logger.LogProvider.GetLogger(LOGGER_CATEGORY);
             var appId = creds?.ApplicationId ?? Configuration.Instance.Settings["appSettings:Vonage.Application.Id"];
@@ -288,7 +289,7 @@ private static T SendGetRequest<T>(Uri uri, AuthType authType, Credentials creds
                     Jwt.CreateToken(appId, appKeyPath));
             }
             logger.LogDebug($"GET {uri}");
-            var json = SendHttpRequest(req).JsonResponse;
+            var json = (await SendHttpRequestAsync(req)).JsonResponse;
             return JsonConvert.DeserializeObject<T>(json);
         }
 
@@ -302,7 +303,7 @@ private static T SendGetRequest<T>(Uri uri, AuthType authType, Credentials creds
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
         /// <returns></returns>
-        public static VonageResponse DoRequestWithUrlContent(string method, Uri uri, Dictionary<string, string> parameters, AuthType authType = AuthType.Query, Credentials creds = null)
+        public static async Task<VonageResponse> DoRequestWithUrlContentAsync(string method, Uri uri, Dictionary<string, string> parameters, AuthType authType = AuthType.Query, Credentials creds = null)
         {
             var logger = Logger.LogProvider.GetLogger(LOGGER_CATEGORY);
             var sb = new StringBuilder();
@@ -332,7 +333,7 @@ public static VonageResponse DoRequestWithUrlContent(string method, Uri uri, Dic
             req.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/x-www-form-urlencoded");
 
             logger.LogDebug($"{method} {uri} {sb}");
-            return SendHttpRequest(req);
+            return await SendHttpRequestAsync(req);
         }
 
         /// <summary>
@@ -341,11 +342,11 @@ public static VonageResponse DoRequestWithUrlContent(string method, Uri uri, Dic
         /// <param name="req"></param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
         /// <returns></returns>
-        public static VonageResponse SendHttpRequest(HttpRequestMessage req)
+        public static async Task<VonageResponse> SendHttpRequestAsync(HttpRequestMessage req)
         {
             var logger = Logger.LogProvider.GetLogger(LOGGER_CATEGORY);
-            var response = Configuration.Instance.Client.SendAsync(req).Result;
-            var stream = response.Content.ReadAsStreamAsync().Result;
+            var response = await Configuration.Instance.Client.SendAsync(req);
+            var stream = await response.Content.ReadAsStreamAsync();
             string json;
             using (var sr = new StreamReader(stream))
             {
@@ -378,7 +379,7 @@ public static VonageResponse SendHttpRequest(HttpRequestMessage req)
         /// <param name="authType">Authorization type used on the API</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public static T DoRequestWithJsonContent<T>(string method, Uri uri, object payload, AuthType authType, Credentials creds)
+        public static async Task<T> DoRequestWithJsonContentAsync<T>(string method, Uri uri, object payload, AuthType authType, Credentials creds)
         {
             var appId = creds?.ApplicationId ?? Configuration.Instance.Settings["appSettings:Vonage.Application.Id"];
             var appKeyPath = creds?.ApplicationKey ?? Configuration.Instance.Settings["appSettings:Vonage.Application.Key"];
@@ -422,7 +423,7 @@ public static T DoRequestWithJsonContent<T>(string method, Uri uri, object paylo
             var data = Encoding.UTF8.GetBytes(json);
             req.Content = new ByteArrayContent(data);
             req.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
-            var json_response = SendHttpRequest(req).JsonResponse;
+            var json_response = (await SendHttpRequestAsync(req)).JsonResponse;
             return JsonConvert.DeserializeObject<T>(json_response);            
         }
 
@@ -434,7 +435,7 @@ public static T DoRequestWithJsonContent<T>(string method, Uri uri, object paylo
         /// <param name="creds"></param>
         /// <returns>HttpResponseMessage</returns>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public static HttpResponseMessage DoGetRequestWithJwt(Uri uri, Credentials creds)
+        public static async Task<HttpResponseMessage> DoGetRequestWithJwtAsync(Uri uri, Credentials creds)
         {
             var logger = Logger.LogProvider.GetLogger(LOGGER_CATEGORY);
             var appId = creds?.ApplicationId ?? Configuration.Instance.Settings["appSettings:Vonage.Application.Id"];
@@ -453,7 +454,7 @@ public static HttpResponseMessage DoGetRequestWithJwt(Uri uri, Credentials creds
 
             logger.LogDebug($"GET {uri}");
 
-            var result = Configuration.Instance.Client.SendAsync(req).Result;
+            var result = await Configuration.Instance.Client.SendAsync(req);
 
             try
             {
@@ -477,10 +478,10 @@ public static HttpResponseMessage DoGetRequestWithJwt(Uri uri, Credentials creds
         /// <param name="creds"></param>
         /// <returns></returns>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public static T DoPostRequestUrlContentFromObject<T>(Uri uri, object parameters, Credentials creds = null)
+        public static async Task<T> DoPostRequestUrlContentFromObjectAsync<T>(Uri uri, object parameters, Credentials creds = null)
         {
             var apiParams = GetParameters(parameters);
-            return DoPostRequestWithUrlContent<T>(uri, apiParams, creds);
+            return await DoPostRequestWithUrlContentAsync<T>(uri, apiParams, creds);
         }
 
         /// <summary>
@@ -492,9 +493,9 @@ public static T DoPostRequestUrlContentFromObject<T>(Uri uri, object parameters,
         /// <param name="creds"></param>
         /// <returns></returns>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public static T DoPostRequestWithUrlContent<T>(Uri uri, Dictionary<string, string> parameters, Credentials creds = null) 
+        public static async Task<T> DoPostRequestWithUrlContentAsync<T>(Uri uri, Dictionary<string, string> parameters, Credentials creds = null) 
         {
-            var response = DoRequestWithUrlContent("POST", uri, parameters, creds:creds);
+            var response = await DoRequestWithUrlContentAsync("POST", uri, parameters, creds:creds);
             return JsonConvert.DeserializeObject<T>(response.JsonResponse);
         }
 
@@ -506,6 +507,6 @@ public static T DoPostRequestWithUrlContent<T>(Uri uri, Dictionary<string, strin
         /// <param name="creds"></param>
         /// <returns></returns>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public static VonageResponse DoDeleteRequestWithUrlContent(Uri uri, Dictionary<string, string> parameters, AuthType authType = AuthType.Query, Credentials creds = null) => DoRequestWithUrlContent("DELETE", uri, parameters, authType, creds);
+        public static async Task<VonageResponse> DoDeleteRequestWithUrlContentAsync(Uri uri, Dictionary<string, string> parameters, AuthType authType = AuthType.Query, Credentials creds = null) => await DoRequestWithUrlContentAsync("DELETE", uri, parameters, authType, creds);
     }
 }
\ No newline at end of file
diff --git a/Vonage/ShortCodes/IShortCodesClient.cs b/Vonage/ShortCodes/IShortCodesClient.cs
index b6386f13e..2f783c896 100644
--- a/Vonage/ShortCodes/IShortCodesClient.cs
+++ b/Vonage/ShortCodes/IShortCodesClient.cs
@@ -1,15 +1,16 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.ShortCodes
 {
     public interface IShortCodesClient
     {
-        OptInSearchResponse QueryOptIns(OptInQueryRequest request, Credentials creds = null);
+        Task<OptInSearchResponse> QueryOptInsAsync(OptInQueryRequest request, Credentials creds = null);
 
-        OptInRecord ManageOptIn(OptInManageRequest request, Credentials creds = null);
+        Task<OptInRecord> ManageOptInAsync(OptInManageRequest request, Credentials creds = null);
 
-        AlertResponse SendAlert(AlertRequest request, Credentials creds = null);
+        Task<AlertResponse> SendAlertAsync(AlertRequest request, Credentials creds = null);
 
-        TwoFactorAuthResponse SendTwoFactorAuth(TwoFactorAuthRequest request, Credentials creds = null);
+        Task<TwoFactorAuthResponse> SendTwoFactorAuthAsync(TwoFactorAuthRequest request, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/ShortCodes/ShortCodesClient.cs b/Vonage/ShortCodes/ShortCodesClient.cs
index 15d7bb74c..4f0c2ed23 100644
--- a/Vonage/ShortCodes/ShortCodesClient.cs
+++ b/Vonage/ShortCodes/ShortCodesClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.ShortCodes
@@ -10,36 +11,36 @@ public ShortCodesClient(Credentials credentials = null)
         {
             Credentials = credentials;
         }
-        public OptInSearchResponse QueryOptIns(OptInQueryRequest request, Credentials creds = null)
+        public Task<OptInSearchResponse> QueryOptInsAsync(OptInQueryRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<OptInSearchResponse>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<OptInSearchResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/sc/us/alert/opt-in/query/json"),
                 ApiRequest.AuthType.Query,
                 request,
                 creds ?? Credentials);
         }
 
-        public OptInRecord ManageOptIn(OptInManageRequest request, Credentials creds = null)
+        public Task<OptInRecord> ManageOptInAsync(OptInManageRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<OptInRecord>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<OptInRecord>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/sc/us/alert/opt-in/manage/json"),
                 ApiRequest.AuthType.Query,
                 request,
                 creds ?? Credentials);
         }
 
-        public AlertResponse SendAlert(AlertRequest request, Credentials creds = null)
+        public Task<AlertResponse> SendAlertAsync(AlertRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<AlertResponse>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<AlertResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/sc/us/alert/json"),
                 ApiRequest.AuthType.Query,
                 request,
                 creds ?? Credentials);
         }
 
-        public TwoFactorAuthResponse SendTwoFactorAuth(TwoFactorAuthRequest request, Credentials creds = null)
+        public Task<TwoFactorAuthResponse> SendTwoFactorAuthAsync(TwoFactorAuthRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<TwoFactorAuthResponse>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<TwoFactorAuthResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Rest, "/sc/us/2fa/json"),
                 ApiRequest.AuthType.Query,
                 request,
diff --git a/Vonage/Verify/IVerifyClient.cs b/Vonage/Verify/IVerifyClient.cs
index 1afe2c110..c6387885c 100644
--- a/Vonage/Verify/IVerifyClient.cs
+++ b/Vonage/Verify/IVerifyClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Verify
@@ -10,7 +11,7 @@ public interface IVerifyClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        VerifyResponse VerifyRequest(VerifyRequest request, Credentials creds = null);
+        Task<VerifyResponse> VerifyRequestAsync(VerifyRequest request, Credentials creds = null);
 
         /// <summary>
         /// Use Verify check to confirm that the PIN you received from your user matches the one sent by Vonage in your Verify request
@@ -18,7 +19,7 @@ public interface IVerifyClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        VerifyCheckResponse VerifyCheck(VerifyCheckRequest request, Credentials creds = null);
+        Task<VerifyCheckResponse> VerifyCheckAsync(VerifyCheckRequest request, Credentials creds = null);
 
         /// <summary>
         /// Use Verify search to check the status of past or current verification requests
@@ -26,7 +27,7 @@ public interface IVerifyClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        VerifySearchResponse VerifySearch(VerifySearchRequest request, Credentials creds = null);
+        Task<VerifySearchResponse> VerifySearchAsync(VerifySearchRequest request, Credentials creds = null);
 
         /// <summary>
         /// Control the progress of your Verify requests. To cancel an existing Verify request, or to trigger the next verification event
@@ -34,7 +35,7 @@ public interface IVerifyClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        VerifyControlResponse VerifyControl(VerifyControlRequest request, Credentials creds = null);
+        Task<VerifyControlResponse> VerifyControlAsync(VerifyControlRequest request, Credentials creds = null);
 
         /// <summary>
         /// Use Verify request to generate and send a PIN to your user to authorize a payment: 
@@ -45,6 +46,6 @@ public interface IVerifyClient
         /// <param name="request"></param>
         /// <param name="creds"></param>
         /// <returns></returns>
-        VerifyResponse VerifyRequestWithPSD2(Psd2Request request, Credentials creds = null);
+        Task<VerifyResponse> VerifyRequestWithPSD2Async(Psd2Request request, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Verify/VerifyClient.cs b/Vonage/Verify/VerifyClient.cs
index 25a6148af..52420fb02 100644
--- a/Vonage/Verify/VerifyClient.cs
+++ b/Vonage/Verify/VerifyClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Request;
 
 namespace Vonage.Verify
@@ -10,9 +11,9 @@ public VerifyClient(Credentials creds = null)
         {
             Credentials = creds;
         }
-        public VerifyResponse VerifyRequest(VerifyRequest request, Credentials creds = null)
+        public async Task<VerifyResponse> VerifyRequestAsync(VerifyRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoPostRequestUrlContentFromObject<VerifyResponse>(
+            var response = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<VerifyResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/verify/json"),
                 request,
                 creds ?? Credentials
@@ -21,9 +22,9 @@ public VerifyResponse VerifyRequest(VerifyRequest request, Credentials creds = n
             return response;
         }
 
-        public VerifyCheckResponse VerifyCheck(VerifyCheckRequest request, Credentials creds = null)
+        public async Task<VerifyCheckResponse> VerifyCheckAsync(VerifyCheckRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoPostRequestUrlContentFromObject<VerifyCheckResponse>(
+            var response = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<VerifyCheckResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/verify/check/json"),
                 request,
                 creds ?? Credentials
@@ -32,9 +33,9 @@ public VerifyCheckResponse VerifyCheck(VerifyCheckRequest request, Credentials c
             return response;
         }
 
-        public VerifySearchResponse VerifySearch(VerifySearchRequest request, Credentials creds = null)
+        public Task<VerifySearchResponse> VerifySearchAsync(VerifySearchRequest request, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<VerifySearchResponse>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<VerifySearchResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/verify/search/json"),
                 ApiRequest.AuthType.Query,
                 request,
@@ -42,9 +43,9 @@ public VerifySearchResponse VerifySearch(VerifySearchRequest request, Credential
             );
         }
 
-        public VerifyControlResponse VerifyControl(VerifyControlRequest request, Credentials creds = null)
+        public async Task<VerifyControlResponse> VerifyControlAsync(VerifyControlRequest request, Credentials creds = null)
         {
-            var response = ApiRequest.DoPostRequestUrlContentFromObject<VerifyControlResponse>(
+            var response = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<VerifyControlResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/verify/control/json"),
                 request,
                 creds ?? Credentials
@@ -53,9 +54,9 @@ public VerifyControlResponse VerifyControl(VerifyControlRequest request, Credent
             return response;
         }
 
-        public VerifyResponse VerifyRequestWithPSD2(Psd2Request request, Credentials creds)
+        public async Task<VerifyResponse> VerifyRequestWithPSD2Async(Psd2Request request, Credentials creds)
         {
-            var response = ApiRequest.DoPostRequestUrlContentFromObject<VerifyResponse>(
+            var response = await ApiRequest.DoPostRequestUrlContentFromObjectAsync<VerifyResponse>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, "/verify/psd2/json"),
                 request,
                 creds ?? Credentials
diff --git a/Vonage/Voice/IVoiceClient.cs b/Vonage/Voice/IVoiceClient.cs
index 6b7f55525..c60df8be2 100644
--- a/Vonage/Voice/IVoiceClient.cs
+++ b/Vonage/Voice/IVoiceClient.cs
@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Vonage.Common;
 using Vonage.Request;
 
@@ -12,7 +13,7 @@ public interface IVoiceClient
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <returns></returns>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        CallResponse CreateCall(CallCommand command, Credentials creds = null);
+        Task<CallResponse> CreateCallAsync(CallCommand command, Credentials creds = null);
 
         /// <summary>
         /// GET /v1/calls - retrieve information about all your Calls
@@ -20,7 +21,7 @@ public interface IVoiceClient
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// </summary>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        PageResponse<CallList> GetCalls(CallSearchFilter filter, Credentials creds = null);
+        Task<PageResponse<CallList>> GetCallsAsync(CallSearchFilter filter, Credentials creds = null);
         
         /// <summary>
         /// GET /v1/calls/{uuid} - retrieve information about a single Call
@@ -28,7 +29,7 @@ public interface IVoiceClient
         /// <param name="id">id of call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        CallRecord GetCall(string id, Credentials creds = null);
+        Task<CallRecord> GetCallAsync(string id, Credentials creds = null);
         
         /// <summary>
         /// PUT /v1/calls/{uuid} - modify an existing Call
@@ -37,7 +38,7 @@ public interface IVoiceClient
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        bool UpdateCall(string id, CallEditCommand command, Credentials creds = null);
+        Task<bool> UpdateCallAsync(string id, CallEditCommand command, Credentials creds = null);
         
         /// <summary>
         /// PUT /v1/calls/{uuid}/stream - stream an audio file to an active Call
@@ -46,7 +47,7 @@ public interface IVoiceClient
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        CallCommandResponse StartStream(string id, StreamCommand command, Credentials creds = null);
+        Task<CallCommandResponse> StartStreamAsync(string id, StreamCommand command, Credentials creds = null);
         
         /// <summary>
         /// DELETE /v1/calls/{uuid}/stream - stop streaming an audio file to an active Call
@@ -54,7 +55,7 @@ public interface IVoiceClient
         /// <param name="id">id of call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        CallCommandResponse StopStream(string id, Credentials creds = null);
+        Task<CallCommandResponse> StopStreamAsync(string id, Credentials creds = null);
         
         /// <summary>
         /// PUT /v1/calls/{uuid}/talk - send a synthesized speech message to an active Call
@@ -63,7 +64,7 @@ public interface IVoiceClient
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        CallCommandResponse StartTalk(string id, TalkCommand cmd, Credentials creds = null);
+        Task<CallCommandResponse> StartTalkAsync(string id, TalkCommand cmd, Credentials creds = null);
         
         /// <summary>
         /// DELETE /v1/calls/{uuid}/talk - stop sending a synthesized speech message to an active Call
@@ -71,7 +72,7 @@ public interface IVoiceClient
         /// <param name="id">id of call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        CallCommandResponse StopTalk(string id, Credentials creds = null);
+        Task<CallCommandResponse> StopTalkAsync(string id, Credentials creds = null);
         
         /// <summary>
         /// PUT /v1/calls/{uuid}/dtmf - send Dual-tone multi-frequency(DTMF) tones to an active Call
@@ -80,7 +81,7 @@ public interface IVoiceClient
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        CallCommandResponse StartDtmf(string id, DtmfCommand cmd, Credentials creds = null);
+        Task<CallCommandResponse> StartDtmfAsync(string id, DtmfCommand cmd, Credentials creds = null);
         
         /// <summary>
         /// GET - retrieves the recording from a call based off of the input url
@@ -89,6 +90,6 @@ public interface IVoiceClient
         /// <param name="creds">Overridden credentials</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
         /// <returns>A response containing a byte array representing the file stream</returns>
-        GetRecordingResponse GetRecording(string recordingUrl, Credentials creds = null);
+        Task<GetRecordingResponse> GetRecordingAsync(string recordingUrl, Credentials creds = null);
     }
 }
\ No newline at end of file
diff --git a/Vonage/Voice/VoiceClient.cs b/Vonage/Voice/VoiceClient.cs
index 7771b00d9..146bb88ea 100644
--- a/Vonage/Voice/VoiceClient.cs
+++ b/Vonage/Voice/VoiceClient.cs
@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Threading.Tasks;
 using Vonage.Common;
 using Vonage.Request;
 
@@ -25,9 +26,9 @@ public VoiceClient(Credentials credentials = null)
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <returns></returns>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public CallResponse CreateCall(CallCommand command, Credentials creds = null)
+        public Task<CallResponse> CreateCallAsync(CallCommand command, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<CallResponse>(
+            return ApiRequest.DoRequestWithJsonContentAsync<CallResponse>(
                 POST,
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, CALLS_ENDPOINT),
                 command, 
@@ -42,9 +43,9 @@ public CallResponse CreateCall(CallCommand command, Credentials creds = null)
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// </summary>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public PageResponse<CallList> GetCalls(CallSearchFilter filter, Credentials creds = null)
+        public Task<PageResponse<CallList>> GetCallsAsync(CallSearchFilter filter, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<PageResponse<CallList>>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<PageResponse<CallList>>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, CALLS_ENDPOINT),
                 ApiRequest.AuthType.Bearer,
                 filter,
@@ -58,9 +59,9 @@ public PageResponse<CallList> GetCalls(CallSearchFilter filter, Credentials cred
         /// <param name="id">id of call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public CallRecord GetCall(string id, Credentials creds = null)
+        public Task<CallRecord> GetCallAsync(string id, Credentials creds = null)
         {
-            return ApiRequest.DoGetRequestWithQueryParameters<CallRecord>(
+            return ApiRequest.DoGetRequestWithQueryParametersAsync<CallRecord>(
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"{CALLS_ENDPOINT}/{id}"),
                 ApiRequest.AuthType.Bearer,
                 credentials:  creds ?? Credentials
@@ -74,9 +75,9 @@ public CallRecord GetCall(string id, Credentials creds = null)
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public bool UpdateCall(string id, CallEditCommand command, Credentials creds = null)
+        public async Task<bool> UpdateCallAsync(string id, CallEditCommand command, Credentials creds = null)
         {
-            ApiRequest.DoRequestWithJsonContent<CallRecord>(
+            await ApiRequest.DoRequestWithJsonContentAsync<CallRecord>(
                 PUT,
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"{CALLS_ENDPOINT}/{id}"),
                 command,
@@ -93,9 +94,9 @@ public bool UpdateCall(string id, CallEditCommand command, Credentials creds = n
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public CallCommandResponse StartStream(string id, StreamCommand command, Credentials creds = null)
+        public Task<CallCommandResponse> StartStreamAsync(string id, StreamCommand command, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<CallCommandResponse>(
+            return ApiRequest.DoRequestWithJsonContentAsync<CallCommandResponse>(
                 PUT,
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"{CALLS_ENDPOINT}/{id}/stream"),
                 command,
@@ -110,9 +111,9 @@ public CallCommandResponse StartStream(string id, StreamCommand command, Credent
         /// <param name="id">id of call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public CallCommandResponse StopStream(string id, Credentials creds = null)
+        public Task<CallCommandResponse> StopStreamAsync(string id, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<CallCommandResponse>(
+            return ApiRequest.DoRequestWithJsonContentAsync<CallCommandResponse>(
                 DELETE,
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"{CALLS_ENDPOINT}/{id}/stream"),
                 new { },
@@ -128,9 +129,9 @@ public CallCommandResponse StopStream(string id, Credentials creds = null)
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public CallCommandResponse StartTalk(string id, TalkCommand cmd, Credentials creds = null)
+        public Task<CallCommandResponse> StartTalkAsync(string id, TalkCommand cmd, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<CallCommandResponse>(
+            return ApiRequest.DoRequestWithJsonContentAsync<CallCommandResponse>(
                 PUT,
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"{CALLS_ENDPOINT}/{id}/talk"),
                 cmd,
@@ -145,9 +146,9 @@ public CallCommandResponse StartTalk(string id, TalkCommand cmd, Credentials cre
         /// <param name="id">id of call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public CallCommandResponse StopTalk(string id, Credentials creds = null)
+        public Task<CallCommandResponse> StopTalkAsync(string id, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<CallCommandResponse>(
+            return ApiRequest.DoRequestWithJsonContentAsync<CallCommandResponse>(
                 DELETE,
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"{CALLS_ENDPOINT}/{id}/talk"),
                 new { },
@@ -163,9 +164,9 @@ public CallCommandResponse StopTalk(string id, Credentials creds = null)
         /// <param name="cmd">Command to execute against call</param>
         /// <param name="creds">(Optional) Overridden credentials for only this request</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
-        public CallCommandResponse StartDtmf(string id, DtmfCommand cmd, Credentials creds = null)
+        public Task<CallCommandResponse> StartDtmfAsync(string id, DtmfCommand cmd, Credentials creds = null)
         {
-            return ApiRequest.DoRequestWithJsonContent<CallCommandResponse>(
+            return ApiRequest.DoRequestWithJsonContentAsync<CallCommandResponse>(
                 PUT, 
                 ApiRequest.GetBaseUri(ApiRequest.UriType.Api, $"{CALLS_ENDPOINT}/{id}/dtmf"), 
                 cmd, 
@@ -181,9 +182,9 @@ public CallCommandResponse StartDtmf(string id, DtmfCommand cmd, Credentials cre
         /// <param name="creds">Overridden credentials</param>
         /// <exception cref="VonageHttpRequestException">thrown if an error is encountered when talking to the API</exception>
         /// <returns>A response containing a byte array representing the file stream</returns>
-        public GetRecordingResponse GetRecording(string recordingUrl, Credentials creds = null)
+        public async Task<GetRecordingResponse> GetRecordingAsync(string recordingUrl, Credentials creds = null)
         {
-            using (var response = ApiRequest.DoGetRequestWithJwt(new Uri(recordingUrl), creds ?? Credentials))
+            using (var response = await ApiRequest.DoGetRequestWithJwtAsync(new Uri(recordingUrl), creds ?? Credentials))
             {
                 var readTask = response.Content.ReadAsStreamAsync();
                 byte[] bytes;