diff --git a/bandwidth.yml b/bandwidth.yml
index c4b1fb2b..11c79d23 100644
--- a/bandwidth.yml
+++ b/bandwidth.yml
@@ -2202,8 +2202,8 @@ components:
             parameter as described in <a
             href='https://tools.ietf.org/html/rfc7433'>RFC
 
-            7433</a>. Only 'jwt' and 'base64' encodings are allowed. The entire
-            value
+            7433</a>. Only 'jwt', 'base64' and 'hex' encodings are allowed. The
+            entire value
 
             cannot exceed 350 characters, including parameters and separators.
         applicationId:
diff --git a/bandwidth/models/create_call.py b/bandwidth/models/create_call.py
index e1fedd09..ca3ec03a 100644
--- a/bandwidth/models/create_call.py
+++ b/bandwidth/models/create_call.py
@@ -34,7 +34,7 @@ class CreateCall(BaseModel):
     var_from: StrictStr = Field(description="A Bandwidth phone number on your account the call should come from (must be in E.164 format, like `+15555551212`) even if `privacy` is set to true.", alias="from")
     privacy: Optional[StrictBool] = Field(default=None, description="Hide the calling number. The `displayName` field can be used to customize the displayed name.")
     display_name: Optional[Annotated[str, Field(strict=True, max_length=256)]] = Field(default=None, description="The caller display name to use when the call is created.  May not exceed 256 characters nor contain control characters such as new lines. If `privacy` is true, only the following values are valid: `Restricted`, `Anonymous`, `Private`, or `Unavailable`.", alias="displayName")
-    uui: Optional[StrictStr] = Field(default=None, description="A comma-separated list of 'User-To-User' headers to be sent in the INVITE when calling a SIP URI. Each value must end with an 'encoding' parameter as described in <a href='https://tools.ietf.org/html/rfc7433'>RFC 7433</a>. Only 'jwt' and 'base64' encodings are allowed. The entire value cannot exceed 350 characters, including parameters and separators.")
+    uui: Optional[StrictStr] = Field(default=None, description="A comma-separated list of 'User-To-User' headers to be sent in the INVITE when calling a SIP URI. Each value must end with an 'encoding' parameter as described in <a href='https://tools.ietf.org/html/rfc7433'>RFC 7433</a>. Only 'jwt', 'base64' and 'hex' encodings are allowed. The entire value cannot exceed 350 characters, including parameters and separators.")
     application_id: StrictStr = Field(description="The id of the application associated with the `from` number.", alias="applicationId")
     answer_url: Annotated[str, Field(strict=True, max_length=2048)] = Field(description="The full URL to send the <a href='/docs/voice/webhooks/answer'>Answer</a> event to when the called party answers. This endpoint should return the first <a href='/docs/voice/bxml'>BXML document</a> to be executed in the call.  Must use `https` if specifying `username` and `password`.", alias="answerUrl")
     answer_method: Optional[CallbackMethodEnum] = Field(default=CallbackMethodEnum.POST, alias="answerMethod")
diff --git a/docs/CreateCall.md b/docs/CreateCall.md
index ec496aca..935ed3ca 100644
--- a/docs/CreateCall.md
+++ b/docs/CreateCall.md
@@ -9,7 +9,7 @@ Name | Type | Description | Notes
 **var_from** | **str** | A Bandwidth phone number on your account the call should come from (must be in E.164 format, like &#x60;+15555551212&#x60;) even if &#x60;privacy&#x60; is set to true. | 
 **privacy** | **bool** | Hide the calling number. The &#x60;displayName&#x60; field can be used to customize the displayed name. | [optional] 
 **display_name** | **str** | The caller display name to use when the call is created.  May not exceed 256 characters nor contain control characters such as new lines. If &#x60;privacy&#x60; is true, only the following values are valid: &#x60;Restricted&#x60;, &#x60;Anonymous&#x60;, &#x60;Private&#x60;, or &#x60;Unavailable&#x60;. | [optional] 
-**uui** | **str** | A comma-separated list of &#39;User-To-User&#39; headers to be sent in the INVITE when calling a SIP URI. Each value must end with an &#39;encoding&#39; parameter as described in &lt;a href&#x3D;&#39;https://tools.ietf.org/html/rfc7433&#39;&gt;RFC 7433&lt;/a&gt;. Only &#39;jwt&#39; and &#39;base64&#39; encodings are allowed. The entire value cannot exceed 350 characters, including parameters and separators. | [optional] 
+**uui** | **str** | A comma-separated list of &#39;User-To-User&#39; headers to be sent in the INVITE when calling a SIP URI. Each value must end with an &#39;encoding&#39; parameter as described in &lt;a href&#x3D;&#39;https://tools.ietf.org/html/rfc7433&#39;&gt;RFC 7433&lt;/a&gt;. Only &#39;jwt&#39;, &#39;base64&#39; and &#39;hex&#39; encodings are allowed. The entire value cannot exceed 350 characters, including parameters and separators. | [optional] 
 **application_id** | **str** | The id of the application associated with the &#x60;from&#x60; number. | 
 **answer_url** | **str** | The full URL to send the &lt;a href&#x3D;&#39;/docs/voice/webhooks/answer&#39;&gt;Answer&lt;/a&gt; event to when the called party answers. This endpoint should return the first &lt;a href&#x3D;&#39;/docs/voice/bxml&#39;&gt;BXML document&lt;/a&gt; to be executed in the call.  Must use &#x60;https&#x60; if specifying &#x60;username&#x60; and &#x60;password&#x60;. | 
 **answer_method** | [**CallbackMethodEnum**](CallbackMethodEnum.md) |  | [optional] [default to CallbackMethodEnum.POST]