diff --git a/src/libs/Ultravox/Generated/Ultravox.AgentsClient.AgentsCallsCreate.g.cs b/src/libs/Ultravox/Generated/Ultravox.AgentsClient.AgentsCallsCreate.g.cs
index 202c0a9..d828f56 100644
--- a/src/libs/Ultravox/Generated/Ultravox.AgentsClient.AgentsCallsCreate.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.AgentsClient.AgentsCallsCreate.g.cs
@@ -247,6 +247,13 @@ partial void ProcessAgentsCallsCreateResponseContent(
         /// <param name="retentionPolicy">
         /// The (overridden) retention policy for the call's data after it ends.
         /// </param>
+        /// <param name="sharedSecrets">
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </param>
         /// <param name="cancellationToken">The token to cancel the operation with</param>
         /// <exception cref="global::System.InvalidOperationException"></exception>
         public async global::System.Threading.Tasks.Task<global::Ultravox.Call> AgentsCallsCreateAsync(
@@ -267,6 +274,7 @@ partial void ProcessAgentsCallsCreateResponseContent(
             global::Ultravox.UltravoxV1ExternalVoice? voiceOverrides = default,
             global::Ultravox.UltravoxV1ToolOverrides? toolOverrides = default,
             global::Ultravox.UltravoxV1StartAgentCallRequestRetentionPolicy? retentionPolicy = default,
+            global::System.Collections.Generic.IList<string>? sharedSecrets = default,
             global::System.Threading.CancellationToken cancellationToken = default)
         {
             var __request = new global::Ultravox.UltravoxV1StartAgentCallRequest
@@ -287,6 +295,7 @@ partial void ProcessAgentsCallsCreateResponseContent(
                 VoiceOverrides = voiceOverrides,
                 ToolOverrides = toolOverrides,
                 RetentionPolicy = retentionPolicy,
+                SharedSecrets = sharedSecrets,
             };
 
             return await AgentsCallsCreateAsync(
diff --git a/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs b/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs
index d06cd2e..3663970 100644
--- a/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs
@@ -295,6 +295,13 @@ partial void ProcessCallsCreateResponseContent(
         /// The retention policy for the call's data after it ends.<br/>
         ///  This feature must be enabled for your account.
         /// </param>
+        /// <param name="sharedSecrets">
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </param>
         /// <param name="cancellationToken">The token to cancel the operation with</param>
         /// <exception cref="global::System.InvalidOperationException"></exception>
         public async global::System.Threading.Tasks.Task<global::Ultravox.Call> CallsCreateAsync(
@@ -326,6 +333,7 @@ partial void ProcessCallsCreateResponseContent(
             global::Ultravox.UltravoxV1Callbacks? callbacks = default,
             global::Ultravox.UltravoxV1ExternalVoice? voiceOverrides = default,
             global::Ultravox.UltravoxV1StartCallRequestRetentionPolicy? retentionPolicy = default,
+            global::System.Collections.Generic.IList<string>? sharedSecrets = default,
             global::System.Threading.CancellationToken cancellationToken = default)
         {
             var __request = new global::Ultravox.UltravoxV1StartCallRequest
@@ -356,6 +364,7 @@ partial void ProcessCallsCreateResponseContent(
                 Callbacks = callbacks,
                 VoiceOverrides = voiceOverrides,
                 RetentionPolicy = retentionPolicy,
+                SharedSecrets = sharedSecrets,
             };
 
             return await CallsCreateAsync(
diff --git a/src/libs/Ultravox/Generated/Ultravox.IAgentsClient.AgentsCallsCreate.g.cs b/src/libs/Ultravox/Generated/Ultravox.IAgentsClient.AgentsCallsCreate.g.cs
index 7dc709e..203841b 100644
--- a/src/libs/Ultravox/Generated/Ultravox.IAgentsClient.AgentsCallsCreate.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.IAgentsClient.AgentsCallsCreate.g.cs
@@ -78,6 +78,13 @@ public partial interface IAgentsClient
         /// <param name="retentionPolicy">
         /// The (overridden) retention policy for the call's data after it ends.
         /// </param>
+        /// <param name="sharedSecrets">
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </param>
         /// <param name="cancellationToken">The token to cancel the operation with</param>
         /// <exception cref="global::System.InvalidOperationException"></exception>
         global::System.Threading.Tasks.Task<global::Ultravox.Call> AgentsCallsCreateAsync(
@@ -98,6 +105,7 @@ public partial interface IAgentsClient
             global::Ultravox.UltravoxV1ExternalVoice? voiceOverrides = default,
             global::Ultravox.UltravoxV1ToolOverrides? toolOverrides = default,
             global::Ultravox.UltravoxV1StartAgentCallRequestRetentionPolicy? retentionPolicy = default,
+            global::System.Collections.Generic.IList<string>? sharedSecrets = default,
             global::System.Threading.CancellationToken cancellationToken = default);
     }
 }
\ No newline at end of file
diff --git a/src/libs/Ultravox/Generated/Ultravox.ICallsClient.CallsCreate.g.cs b/src/libs/Ultravox/Generated/Ultravox.ICallsClient.CallsCreate.g.cs
index 02c52fa..5d0a795 100644
--- a/src/libs/Ultravox/Generated/Ultravox.ICallsClient.CallsCreate.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.ICallsClient.CallsCreate.g.cs
@@ -118,6 +118,13 @@ public partial interface ICallsClient
         /// The retention policy for the call's data after it ends.<br/>
         ///  This feature must be enabled for your account.
         /// </param>
+        /// <param name="sharedSecrets">
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </param>
         /// <param name="cancellationToken">The token to cancel the operation with</param>
         /// <exception cref="global::System.InvalidOperationException"></exception>
         global::System.Threading.Tasks.Task<global::Ultravox.Call> CallsCreateAsync(
@@ -149,6 +156,7 @@ public partial interface ICallsClient
             global::Ultravox.UltravoxV1Callbacks? callbacks = default,
             global::Ultravox.UltravoxV1ExternalVoice? voiceOverrides = default,
             global::Ultravox.UltravoxV1StartCallRequestRetentionPolicy? retentionPolicy = default,
+            global::System.Collections.Generic.IList<string>? sharedSecrets = default,
             global::System.Threading.CancellationToken cancellationToken = default);
     }
 }
\ No newline at end of file
diff --git a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1CallTemplate.g.cs b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1CallTemplate.g.cs
index 6925698..9bd8d5d 100644
--- a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1CallTemplate.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1CallTemplate.g.cs
@@ -174,6 +174,17 @@ public sealed partial class UltravoxV1CallTemplate
         [global::System.Text.Json.Serialization.JsonPropertyName("contextSchema")]
         public object? ContextSchema { get; set; }
 
+        /// <summary>
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.<br/>
+        ///  If multiple stages are defined for the call, this will be used only for stages without their own sharedSecrets.
+        /// </summary>
+        [global::System.Text.Json.Serialization.JsonPropertyName("sharedSecrets")]
+        public global::System.Collections.Generic.IList<string>? SharedSecrets { get; set; }
+
         /// <summary>
         /// The default retention policy for calls created with this agent.
         /// </summary>
@@ -289,6 +300,14 @@ public sealed partial class UltravoxV1CallTemplate
         ///    * selected_tools.http.auth_query_params.value<br/>
         ///  If multiple stages are defined for the call, each must define its own context schema (or use the generated one).
         /// </param>
+        /// <param name="sharedSecrets">
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.<br/>
+        ///  If multiple stages are defined for the call, this will be used only for stages without their own sharedSecrets.
+        /// </param>
         /// <param name="retentionPolicy">
         /// The default retention policy for calls created with this agent.
         /// </param>
@@ -318,6 +337,7 @@ public UltravoxV1CallTemplate(
             global::System.Collections.Generic.IList<global::Ultravox.UltravoxV1SelectedTool>? selectedTools,
             global::Ultravox.UltravoxV1DataConnectionConfig? dataConnection,
             object? contextSchema,
+            global::System.Collections.Generic.IList<string>? sharedSecrets,
             global::Ultravox.UltravoxV1CallTemplateRetentionPolicy? retentionPolicy)
         {
             this.Name = name;
@@ -342,6 +362,7 @@ public UltravoxV1CallTemplate(
             this.SelectedTools = selectedTools;
             this.DataConnection = dataConnection;
             this.ContextSchema = contextSchema;
+            this.SharedSecrets = sharedSecrets;
             this.RetentionPolicy = retentionPolicy;
         }
 
diff --git a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfig.g.cs b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfig.g.cs
index c7a9d86..ca06ae8 100644
--- a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfig.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfig.g.cs
@@ -26,6 +26,12 @@ public sealed partial class UltravoxV1DataConnectionConfig
         [global::System.Text.Json.Serialization.JsonPropertyName("dataMessages")]
         public global::Ultravox.UltravoxV1EnabledDataMessages? DataMessages { get; set; }
 
+        /// <summary>
+        /// Additional headers to include when connecting to the websocket endpoint.
+        /// </summary>
+        [global::System.Text.Json.Serialization.JsonPropertyName("headers")]
+        public global::System.Collections.Generic.Dictionary<string, string>? Headers { get; set; }
+
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
         /// </summary>
@@ -44,17 +50,22 @@ public sealed partial class UltravoxV1DataConnectionConfig
         /// <param name="dataMessages">
         /// Controls which data messages are enabled for the data connection.
         /// </param>
+        /// <param name="headers">
+        /// Additional headers to include when connecting to the websocket endpoint.
+        /// </param>
 #if NET7_0_OR_GREATER
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public UltravoxV1DataConnectionConfig(
             string? websocketUrl,
             global::Ultravox.UltravoxV1DataConnectionAudioConfig? audioConfig,
-            global::Ultravox.UltravoxV1EnabledDataMessages? dataMessages)
+            global::Ultravox.UltravoxV1EnabledDataMessages? dataMessages,
+            global::System.Collections.Generic.Dictionary<string, string>? headers)
         {
             this.WebsocketUrl = websocketUrl;
             this.AudioConfig = audioConfig;
             this.DataMessages = dataMessages;
+            this.Headers = headers;
         }
 
         /// <summary>
diff --git a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfigHeaders.Json.g.cs b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfigHeaders.Json.g.cs
new file mode 100644
index 0000000..56112a2
--- /dev/null
+++ b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfigHeaders.Json.g.cs
@@ -0,0 +1,92 @@
+#nullable enable
+
+namespace Ultravox
+{
+    public sealed partial class UltravoxV1DataConnectionConfigHeaders
+    {
+        /// <summary>
+        /// Serializes the current instance to a JSON string using the provided JsonSerializerContext.
+        /// </summary>
+        public string ToJson(
+            global::System.Text.Json.Serialization.JsonSerializerContext jsonSerializerContext)
+        {
+            return global::System.Text.Json.JsonSerializer.Serialize(
+                this,
+                this.GetType(),
+                jsonSerializerContext);
+        }
+
+        /// <summary>
+        /// Serializes the current instance to a JSON string using the provided JsonSerializerOptions.
+        /// </summary>
+#if NET8_0_OR_GREATER
+        [global::System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("JSON serialization and deserialization might require types that cannot be statically analyzed. Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.")]
+        [global::System.Diagnostics.CodeAnalysis.RequiresDynamicCode("JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.")]
+#endif
+        public string ToJson(
+            global::System.Text.Json.JsonSerializerOptions? jsonSerializerOptions = null)
+        {
+            return global::System.Text.Json.JsonSerializer.Serialize(
+                this,
+                jsonSerializerOptions);
+        }
+
+        /// <summary>
+        /// Deserializes a JSON string using the provided JsonSerializerContext.
+        /// </summary>
+        public static global::Ultravox.UltravoxV1DataConnectionConfigHeaders? FromJson(
+            string json,
+            global::System.Text.Json.Serialization.JsonSerializerContext jsonSerializerContext)
+        {
+            return global::System.Text.Json.JsonSerializer.Deserialize(
+                json,
+                typeof(global::Ultravox.UltravoxV1DataConnectionConfigHeaders),
+                jsonSerializerContext) as global::Ultravox.UltravoxV1DataConnectionConfigHeaders;
+        }
+
+        /// <summary>
+        /// Deserializes a JSON string using the provided JsonSerializerOptions.
+        /// </summary>
+#if NET8_0_OR_GREATER
+        [global::System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("JSON serialization and deserialization might require types that cannot be statically analyzed. Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.")]
+        [global::System.Diagnostics.CodeAnalysis.RequiresDynamicCode("JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.")]
+#endif
+        public static global::Ultravox.UltravoxV1DataConnectionConfigHeaders? FromJson(
+            string json,
+            global::System.Text.Json.JsonSerializerOptions? jsonSerializerOptions = null)
+        {
+            return global::System.Text.Json.JsonSerializer.Deserialize<global::Ultravox.UltravoxV1DataConnectionConfigHeaders>(
+                json,
+                jsonSerializerOptions);
+        }
+
+        /// <summary>
+        /// Deserializes a JSON stream using the provided JsonSerializerContext.
+        /// </summary>
+        public static async global::System.Threading.Tasks.ValueTask<global::Ultravox.UltravoxV1DataConnectionConfigHeaders?> FromJsonStreamAsync(
+            global::System.IO.Stream jsonStream,
+            global::System.Text.Json.Serialization.JsonSerializerContext jsonSerializerContext)
+        {
+            return (await global::System.Text.Json.JsonSerializer.DeserializeAsync(
+                jsonStream,
+                typeof(global::Ultravox.UltravoxV1DataConnectionConfigHeaders),
+                jsonSerializerContext).ConfigureAwait(false)) as global::Ultravox.UltravoxV1DataConnectionConfigHeaders;
+        }
+
+        /// <summary>
+        /// Deserializes a JSON stream using the provided JsonSerializerOptions.
+        /// </summary>
+#if NET8_0_OR_GREATER
+        [global::System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("JSON serialization and deserialization might require types that cannot be statically analyzed. Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.")]
+        [global::System.Diagnostics.CodeAnalysis.RequiresDynamicCode("JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.")]
+#endif
+        public static global::System.Threading.Tasks.ValueTask<global::Ultravox.UltravoxV1DataConnectionConfigHeaders?> FromJsonStreamAsync(
+            global::System.IO.Stream jsonStream,
+            global::System.Text.Json.JsonSerializerOptions? jsonSerializerOptions = null)
+        {
+            return global::System.Text.Json.JsonSerializer.DeserializeAsync<global::Ultravox.UltravoxV1DataConnectionConfigHeaders?>(
+                jsonStream,
+                jsonSerializerOptions);
+        }
+    }
+}
diff --git a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfigHeaders.g.cs b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfigHeaders.g.cs
new file mode 100644
index 0000000..08f56fd
--- /dev/null
+++ b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1DataConnectionConfigHeaders.g.cs
@@ -0,0 +1,18 @@
+
+#nullable enable
+
+namespace Ultravox
+{
+    /// <summary>
+    /// Additional headers to include when connecting to the websocket endpoint.
+    /// </summary>
+    public sealed partial class UltravoxV1DataConnectionConfigHeaders
+    {
+
+        /// <summary>
+        /// Additional properties that are not explicitly defined in the schema
+        /// </summary>
+        [global::System.Text.Json.Serialization.JsonExtensionData]
+        public global::System.Collections.Generic.IDictionary<string, object> AdditionalProperties { get; set; } = new global::System.Collections.Generic.Dictionary<string, object>();
+    }
+}
\ No newline at end of file
diff --git a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartAgentCallRequest.g.cs b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartAgentCallRequest.g.cs
index a9e2ccf..81b2173 100644
--- a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartAgentCallRequest.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartAgentCallRequest.g.cs
@@ -116,6 +116,16 @@ public sealed partial class UltravoxV1StartAgentCallRequest
         [global::System.Text.Json.Serialization.JsonConverter(typeof(global::Ultravox.JsonConverters.UltravoxV1StartAgentCallRequestRetentionPolicyJsonConverter))]
         public global::Ultravox.UltravoxV1StartAgentCallRequestRetentionPolicy? RetentionPolicy { get; set; }
 
+        /// <summary>
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </summary>
+        [global::System.Text.Json.Serialization.JsonPropertyName("sharedSecrets")]
+        public global::System.Collections.Generic.IList<string>? SharedSecrets { get; set; }
+
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
         /// </summary>
@@ -183,6 +193,13 @@ public sealed partial class UltravoxV1StartAgentCallRequest
         /// <param name="retentionPolicy">
         /// The (overridden) retention policy for the call's data after it ends.
         /// </param>
+        /// <param name="sharedSecrets">
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </param>
 #if NET7_0_OR_GREATER
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
@@ -202,7 +219,8 @@ public UltravoxV1StartAgentCallRequest(
             string? voice,
             global::Ultravox.UltravoxV1ExternalVoice? voiceOverrides,
             global::Ultravox.UltravoxV1ToolOverrides? toolOverrides,
-            global::Ultravox.UltravoxV1StartAgentCallRequestRetentionPolicy? retentionPolicy)
+            global::Ultravox.UltravoxV1StartAgentCallRequestRetentionPolicy? retentionPolicy,
+            global::System.Collections.Generic.IList<string>? sharedSecrets)
         {
             this.TemplateContext = templateContext;
             this.InitialMessages = initialMessages;
@@ -220,6 +238,7 @@ public UltravoxV1StartAgentCallRequest(
             this.VoiceOverrides = voiceOverrides;
             this.ToolOverrides = toolOverrides;
             this.RetentionPolicy = retentionPolicy;
+            this.SharedSecrets = sharedSecrets;
         }
 
         /// <summary>
diff --git a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartCallRequest.g.cs b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartCallRequest.g.cs
index 22b4654..718cf75 100644
--- a/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartCallRequest.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.Models.UltravoxV1StartCallRequest.g.cs
@@ -180,6 +180,16 @@ public sealed partial class UltravoxV1StartCallRequest
         [global::System.Text.Json.Serialization.JsonConverter(typeof(global::Ultravox.JsonConverters.UltravoxV1StartCallRequestRetentionPolicyJsonConverter))]
         public global::Ultravox.UltravoxV1StartCallRequestRetentionPolicy? RetentionPolicy { get; set; }
 
+        /// <summary>
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </summary>
+        [global::System.Text.Json.Serialization.JsonPropertyName("sharedSecrets")]
+        public global::System.Collections.Generic.IList<string>? SharedSecrets { get; set; }
+
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
         /// </summary>
@@ -280,6 +290,13 @@ public sealed partial class UltravoxV1StartCallRequest
         /// The retention policy for the call's data after it ends.<br/>
         ///  This feature must be enabled for your account.
         /// </param>
+        /// <param name="sharedSecrets">
+        /// Shared secrets used to sign outbound requests (e.g. data connection websocket).<br/>
+        ///  When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and<br/>
+        ///  X-Ultravox-Signature headers will be included. If multiple secrets are provided,<br/>
+        ///  one signature per secret is produced (comma-separated in X-Ultravox-Signature).<br/>
+        ///  Write-only: this field is never included in API responses.
+        /// </param>
 #if NET7_0_OR_GREATER
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
@@ -309,7 +326,8 @@ public UltravoxV1StartCallRequest(
             global::Ultravox.UltravoxV1DataConnectionConfig? dataConnection,
             global::Ultravox.UltravoxV1Callbacks? callbacks,
             global::Ultravox.UltravoxV1ExternalVoice? voiceOverrides,
-            global::Ultravox.UltravoxV1StartCallRequestRetentionPolicy? retentionPolicy)
+            global::Ultravox.UltravoxV1StartCallRequestRetentionPolicy? retentionPolicy,
+            global::System.Collections.Generic.IList<string>? sharedSecrets)
         {
             this.SystemPrompt = systemPrompt;
             this.Temperature = temperature;
@@ -337,6 +355,7 @@ public UltravoxV1StartCallRequest(
             this.Callbacks = callbacks;
             this.VoiceOverrides = voiceOverrides;
             this.RetentionPolicy = retentionPolicy;
+            this.SharedSecrets = sharedSecrets;
         }
 
         /// <summary>
diff --git a/src/libs/Ultravox/openapi.yaml b/src/libs/Ultravox/openapi.yaml
index 8a61a31..15ad635 100644
--- a/src/libs/Ultravox/openapi.yaml
+++ b/src/libs/Ultravox/openapi.yaml
@@ -5762,6 +5762,17 @@ components:
                * selected_tools.http.auth_headers.value
                * selected_tools.http.auth_query_params.value
              If multiple stages are defined for the call, each must define its own context schema (or use the generated one).
+        sharedSecrets:
+          type: array
+          items:
+            type: string
+          description: |-
+            Shared secrets used to sign outbound requests (e.g. data connection websocket).
+             When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and
+             X-Ultravox-Signature headers will be included. If multiple secrets are provided,
+             one signature per secret is produced (comma-separated in X-Ultravox-Signature).
+             Write-only: this field is never included in API responses.
+             If multiple stages are defined for the call, this will be used only for stages without their own sharedSecrets.
         retentionPolicy:
           enum:
           - CALL_RETENTION_POLICY_UNSPECIFIED
@@ -6644,6 +6655,12 @@ components:
           allOf:
           - $ref: '#/components/schemas/ultravox.v1.EnabledDataMessages'
           description: Controls which data messages are enabled for the data connection.
+        headers:
+          type: object
+          additionalProperties:
+            type: string
+          description: Additional headers to include when connecting to the websocket
+            endpoint.
       description: Data connection enables an auxiliary websocket for streaming data
         messages.
     ultravox.v1.DynamicParameter:
@@ -7421,6 +7438,16 @@ components:
           description: The (overridden) retention policy for the call's data after
             it ends.
           format: enum
+        sharedSecrets:
+          type: array
+          items:
+            type: string
+          description: |-
+            Shared secrets used to sign outbound requests (e.g. data connection websocket).
+             When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and
+             X-Ultravox-Signature headers will be included. If multiple secrets are provided,
+             one signature per secret is produced (comma-separated in X-Ultravox-Signature).
+             Write-only: this field is never included in API responses.
       description: A request to start a call with an existing agent.
     ultravox.v1.StartCallRequest:
       type: object
@@ -7562,6 +7589,16 @@ components:
             The retention policy for the call's data after it ends.
              This feature must be enabled for your account.
           format: enum
+        sharedSecrets:
+          type: array
+          items:
+            type: string
+          description: |-
+            Shared secrets used to sign outbound requests (e.g. data connection websocket).
+             When set, X-Ultravox-Call-ID, X-Ultravox-Signature-Timestamp, and
+             X-Ultravox-Signature headers will be included. If multiple secrets are provided,
+             one signature per secret is produced (comma-separated in X-Ultravox-Signature).
+             Write-only: this field is never included in API responses.
       description: A request to start a call.
     ultravox.v1.StaticParameter:
       type: object