diff --git a/lib/solapi/message/service.ex b/lib/solapi/message/service.ex
index 90e8f65..c7c9218 100644
--- a/lib/solapi/message/service.ex
+++ b/lib/solapi/message/service.ex
@@ -89,6 +89,8 @@ defmodule Solapi.Message.Service do
     |> maybe_add("kakaoOptions", get_field(message, :kakao_options, "kakaoOptions"))
     |> maybe_add("rcsOptions", get_field(message, :rcs_options, "rcsOptions"))
     |> maybe_add("customFields", get_field(message, :custom_fields, "customFields"))
+    |> maybe_add("faxOptions", get_field(message, :fax_options, "faxOptions"))
+    |> maybe_add("voiceOptions", get_field(message, :voice_options, "voiceOptions"))
   end
 
   defp get_field(message, atom_key, string_key) do
diff --git a/mix.exs b/mix.exs
index be96126..015c932 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule Solapi.MixProject do
   use Mix.Project
 
-  @version "0.1.0"
+  @version "0.1.1"
   @source_url "https://github.com/solapi/solapi-elixir"
 
   def project do
diff --git a/test/solapi/message/service_test.exs b/test/solapi/message/service_test.exs
index f113f81..6e0dfc5 100644
--- a/test/solapi/message/service_test.exs
+++ b/test/solapi/message/service_test.exs
@@ -103,6 +103,68 @@ defmodule Solapi.Message.ServiceTest do
 
       assert {:error, %Solapi.Error.ValidationError{}} = result
     end
+
+    test "FAX 메시지 발송 (faxOptions 포함)", %{bypass: bypass, client: client} do
+      Bypass.expect(bypass, "POST", "/messages/v4/send-many/detail", fn conn ->
+        {:ok, body, conn} = Plug.Conn.read_body(conn)
+        decoded = Jason.decode!(body)
+
+        message = hd(decoded["messages"])
+        assert message["to"] == "0212345678"
+        assert message["from"] == "0312345678"
+        assert message["faxOptions"]["fileIds"] == ["file_id_123", "file_id_456"]
+
+        response = %{
+          "groupId" => "G_FAX",
+          "messageId" => "M_FAX"
+        }
+
+        conn
+        |> Plug.Conn.put_resp_content_type("application/json")
+        |> Plug.Conn.resp(200, Jason.encode!(response))
+      end)
+
+      result =
+        Service.send(client, %{
+          to: "0212345678",
+          from: "0312345678",
+          fax_options: %{fileIds: ["file_id_123", "file_id_456"]}
+        })
+
+      assert {:ok, %{"messageId" => "M_FAX"}} = result
+    end
+
+    test "음성 메시지 발송 (voiceOptions 포함)", %{bypass: bypass, client: client} do
+      Bypass.expect(bypass, "POST", "/messages/v4/send-many/detail", fn conn ->
+        {:ok, body, conn} = Plug.Conn.read_body(conn)
+        decoded = Jason.decode!(body)
+
+        message = hd(decoded["messages"])
+        assert message["to"] == "01012345678"
+        assert message["from"] == "0212345678"
+        assert message["text"] == "음성 메시지 테스트입니다."
+        assert message["voiceOptions"]["voiceType"] == "FEMALE"
+
+        response = %{
+          "groupId" => "G_VOICE",
+          "messageId" => "M_VOICE"
+        }
+
+        conn
+        |> Plug.Conn.put_resp_content_type("application/json")
+        |> Plug.Conn.resp(200, Jason.encode!(response))
+      end)
+
+      result =
+        Service.send(client, %{
+          to: "01012345678",
+          from: "0212345678",
+          text: "음성 메시지 테스트입니다.",
+          voice_options: %{voiceType: "FEMALE"}
+        })
+
+      assert {:ok, %{"messageId" => "M_VOICE"}} = result
+    end
   end
 
   describe "send/1 with config" do