diff --git a/Vonage.Test.Unit/MessagingTests.cs b/Vonage.Test.Unit/MessagingTests.cs
index 4c2b0baf0..db96b0c65 100644
--- a/Vonage.Test.Unit/MessagingTests.cs
+++ b/Vonage.Test.Unit/MessagingTests.cs
@@ -36,7 +36,7 @@ public void KitcenSinkSendSms(bool passCreds)
             var expectedRequestContent = $"from=AcmeInc&to=447700900000&text={HttpUtility.UrlEncode("Hello World!")}" +
                 $"&ttl=900000&status-report-req=true&callback={HttpUtility.UrlEncode("https://example.com/sms-dlr")}&message-class=0" +
                 $"&type=text&vcard=none&vcal=none&body=638265253311&udh=06050415811581&protocol-id=127&title=welcome&url={HttpUtility.UrlEncode("https://example.com")}" +
-                $"&validity=300000&client-ref=my-personal-reference&account-ref=customer1234&api_key={ApiKey}&api_secret={ApiSecret}&";
+                $"&validity=300000&client-ref=my-personal-reference&account-ref=customer1234&entity-id=testEntity&content-id=testcontent&api_key={ApiKey}&api_secret={ApiSecret}&";
             var request = new Messaging.SendSmsRequest
             {
                 AccountRef = "customer1234",
@@ -56,7 +56,9 @@ public void KitcenSinkSendSms(bool passCreds)
                 Validity = "300000",
                 Vcal = "none",
                 Vcard = "none",
-                Url = "https://example.com"
+                Url = "https://example.com",
+                ContentId ="testcontent",
+                EntityId="testEntity"
                 
 
             };
diff --git a/Vonage/Messaging/SendSmsRequest.cs b/Vonage/Messaging/SendSmsRequest.cs
index f1c812b12..1aae357bc 100644
--- a/Vonage/Messaging/SendSmsRequest.cs
+++ b/Vonage/Messaging/SendSmsRequest.cs
@@ -123,6 +123,20 @@ public class SendSmsRequest
         /// To use this feature, please email support@nexmo.com
         /// </summary>
         [JsonProperty("account-ref")]
-        public string AccountRef { get; set; }        
+        public string AccountRef { get; set; }
+
+        /// <summary>
+        /// A string parameter that satisfies regulatory requirements when sending an SMS to specific countries.
+        /// For more information please refer to the <see href="https://help.nexmo.com/hc/en-us/articles/115011781468">Country-Specific Outbound SMS Features</see>
+        /// </summary>
+        [JsonProperty("entity-id")]
+        public string EntityId { get; set; }
+
+        /// <summary>
+        /// A string parameter that satisfies regulatory requirements when sending an SMS to specific countries.
+        /// For more information please refer to the <see href="https://help.nexmo.com/hc/en-us/articles/115011781468">Country-Specific Outbound SMS Features</see>
+        /// </summary>
+        [JsonProperty("content-id")]
+        public string ContentId { get; set; }
     }
 }
\ No newline at end of file