diff --git a/Vonage.Test/ConversionTest.cs b/Vonage.Test/ConversionTest.cs
index ff52db1e3..ca86de1b2 100644
--- a/Vonage.Test/ConversionTest.cs
+++ b/Vonage.Test/ConversionTest.cs
@@ -8,33 +8,6 @@ namespace Vonage.Test;
 [Trait("Category", "Legacy")]
 public class ConversionTest : TestBase
 {
-    [Theory]
-    [InlineData(false)]
-    [InlineData(true)]
-    public void SmsConversion(bool passCreds)
-    {
-        var expectedUri = $"{this.ApiUrl}/conversions/sms";
-        var expectedContent =
-            "message-id=00A0B0C0&delivered=true&timestamp=2020-01-01+12%3A00%3A00&api_key=testkey&api_secret=testSecret&";
-        var expectedResponse = "";
-        this.Setup(expectedUri, expectedResponse, expectedContent);
-        var request = new ConversionRequest
-            {Delivered = true, MessageId = "00A0B0C0", TimeStamp = "2020-01-01 12:00:00"};
-        var credentials = Credentials.FromApiKeyAndSecret(this.ApiKey, this.ApiSecret);
-        var client = this.BuildVonageClient(credentials);
-        bool response;
-        if (passCreds)
-        {
-            response = client.ConversionClient.SmsConversion(request, credentials);
-        }
-        else
-        {
-            response = client.ConversionClient.SmsConversion(request);
-        }
-
-        Assert.True(response);
-    }
-
     [Theory]
     [InlineData(false)]
     [InlineData(true)]
@@ -62,33 +35,6 @@ public async Task SmsConversionAsync(bool passCreds)
         Assert.True(response);
     }
 
-    [Theory]
-    [InlineData(false)]
-    [InlineData(true)]
-    public void VoiceConversion(bool passCreds)
-    {
-        var expectedUri = $"{this.ApiUrl}/conversions/voice";
-        var expectedContent =
-            "message-id=00A0B0C0&delivered=true&timestamp=2020-01-01+12%3A00%3A00&api_key=testkey&api_secret=testSecret&";
-        var expectedResponse = "";
-        this.Setup(expectedUri, expectedResponse, expectedContent);
-        var request = new ConversionRequest
-            {Delivered = true, MessageId = "00A0B0C0", TimeStamp = "2020-01-01 12:00:00"};
-        var creds = Credentials.FromApiKeyAndSecret(this.ApiKey, this.ApiSecret);
-        var client = this.BuildVonageClient(creds);
-        bool response;
-        if (passCreds)
-        {
-            response = client.ConversionClient.VoiceConversion(request, creds);
-        }
-        else
-        {
-            response = client.ConversionClient.VoiceConversion(request);
-        }
-
-        Assert.True(response);
-    }
-
     [Theory]
     [InlineData(false)]
     [InlineData(true)]
diff --git a/Vonage/Conversions/ConversionClient.cs b/Vonage/Conversions/ConversionClient.cs
index b5b06d049..cb5b75558 100644
--- a/Vonage/Conversions/ConversionClient.cs
+++ b/Vonage/Conversions/ConversionClient.cs
@@ -1,5 +1,4 @@
-using System;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Vonage.Common;
 using Vonage.Request;
 
@@ -25,19 +24,6 @@ internal ConversionClient(Credentials credentials, Configuration configuration,
 
     public Credentials Credentials { get; set; }
 
-    /// <inheritdoc/>
-    [Obsolete("Favor asynchronous version instead.")]
-    public bool SmsConversion(ConversionRequest request, Credentials creds = null)
-    {
-        ApiRequest.Build(this.GetCredentials(creds), this.configuration, this.timeProvider)
-            .DoPostRequestUrlContentFromObject<object>
-            (
-                ApiRequest.GetBaseUri(ApiRequest.UriType.Api, this.configuration, "/conversions/sms"),
-                request
-            );
-        return true;
-    }
-
     /// <inheritdoc/>
     public async Task<bool> SmsConversionAsync(ConversionRequest request, Credentials creds = null)
     {
@@ -50,19 +36,6 @@ await ApiRequest.Build(this.GetCredentials(creds), this.configuration, this.time
         return true;
     }
 
-    /// <inheritdoc/>
-    [Obsolete("Favor asynchronous version instead.")]
-    public bool VoiceConversion(ConversionRequest request, Credentials creds = null)
-    {
-        ApiRequest.Build(this.GetCredentials(creds), this.configuration, this.timeProvider)
-            .DoPostRequestUrlContentFromObject<object>
-            (
-                ApiRequest.GetBaseUri(ApiRequest.UriType.Api, this.configuration, "/conversions/voice"),
-                request
-            );
-        return true;
-    }
-
     /// <inheritdoc/>
     public async Task<bool> VoiceConversionAsync(ConversionRequest request, Credentials creds = null)
     {
diff --git a/Vonage/Conversions/IConversionClient.cs b/Vonage/Conversions/IConversionClient.cs
index 1f9980042..4b8709949 100644
--- a/Vonage/Conversions/IConversionClient.cs
+++ b/Vonage/Conversions/IConversionClient.cs
@@ -13,23 +13,7 @@ public interface IConversionClient
     /// <param name="creds"></param>
     /// <returns></returns>
     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.
-    /// </summary>
-    /// <param name="request"></param>
-    /// <param name="creds"></param>
-    /// <returns></returns>
-    Task<bool> VoiceConversionAsync(ConversionRequest request, Credentials creds = null);
 
-    /// <summary>
-    /// Send a Conversion API request with information about the SMS message 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.
-    /// </summary>
-    /// <param name="request"></param>
-    /// <param name="creds"></param>
-    /// <returns></returns>
-    bool SmsConversion(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.
@@ -37,5 +21,5 @@ 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