diff --git a/src/Bandwidth.Standard.Test/Unit/Model/Bxml/TestStartStream.cs b/src/Bandwidth.Standard.Test/Unit/Model/Bxml/TestStartStream.cs
index b73f530..35114ca 100644
--- a/src/Bandwidth.Standard.Test/Unit/Model/Bxml/TestStartStream.cs
+++ b/src/Bandwidth.Standard.Test/Unit/Model/Bxml/TestStartStream.cs
@@ -11,7 +11,7 @@ public class TestStartStream
 		[Fact]
 		public void StartStreamTest()
 		{
-			var expected = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <StartStream name=\"test\" mode=\"unidirectional\" tracks=\"inbound\" destination=\"wss://test.url/\" streamEventUrl=\"https://test.url/\" streamEventMethod=\"POST\" username=\"username\" password=\"password\">    <StreamParam name=\"testName\" value=\"testValue\" />  </StartStream></Response>";
+			var expected = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <StartStream name=\"test\" mode=\"unidirectional\" tracks=\"inbound\" destination=\"wss://test.url/\" destinationUsername=\"destinationUsername\" destinationPassword=\"destinationPassword\" streamEventUrl=\"https://test.url/\" streamEventMethod=\"POST\" username=\"username\" password=\"password\">    <StreamParam name=\"testName\" value=\"testValue\" />  </StartStream></Response>";
 
 			var streamParam = new StreamParam();
 			streamParam.Name = "testName";
@@ -22,6 +22,8 @@ public void StartStreamTest()
 			startStream.Mode = "unidirectional";
 			startStream.Tracks = "inbound";
 			startStream.Destination = "wss://test.url/";
+			startStream.DestinationUsername = "destinationUsername";
+			startStream.DestinationPassword = "destinationPassword";
 			startStream.StreamEventUrl = "https://test.url/";
 			startStream.StreamEventMethod = "POST";
 			startStream.Username = "username";
diff --git a/src/Bandwidth.Standard/Model/Bxml/Verbs/StartStream.cs b/src/Bandwidth.Standard/Model/Bxml/Verbs/StartStream.cs
index 627f03d..55156eb 100644
--- a/src/Bandwidth.Standard/Model/Bxml/Verbs/StartStream.cs
+++ b/src/Bandwidth.Standard/Model/Bxml/Verbs/StartStream.cs
@@ -37,11 +37,23 @@ public StartStream()
         public string Tracks { get; set; }
 
         /// <summary>
-        ///   A websocket URI to send the stream to.
+        /// A websocket URI to send the stream to.
         /// </summary>
         [XmlAttribute("destination")]
         public string Destination { get; set; }
 
+        /// <summary>
+        /// The username to send in the `Authorization` header of the initial websocket connection to the `destination` URL.
+        /// </summary>
+        [XmlAttribute("destinationUsername")]
+        public string DestinationUsername { get; set; }
+
+        /// <summary>
+        /// The password to send in the `Authorization` header of the initial websocket connection to the `destination` URL.
+        /// </summary>
+        [XmlAttribute("destinationPassword")]
+        public string DestinationPassword { get; set; }
+
         /// <summary>
         /// URL to send the associated Webhook events to during this stream's lifetime.
         /// </summary>