diff --git a/src/Model/Bxml/AttestationLevel.php b/src/Model/Bxml/AttestationLevel.php
new file mode 100644
index 00000000..1c665b3f
--- /dev/null
+++ b/src/Model/Bxml/AttestationLevel.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Bandwidth\Model\Bxml;
+
+enum AttestationLevel: string
+{
+    case A = 'A';
+    case B = 'B';
+    case C = 'C';
+}
diff --git a/src/Model/Bxml/Transfer.php b/src/Model/Bxml/Transfer.php
index 69c13d84..0350a784 100644
--- a/src/Model/Bxml/Transfer.php
+++ b/src/Model/Bxml/Transfer.php
@@ -21,6 +21,8 @@ class Transfer extends NestableVerb
      * @param string|null             $tag                           Custom string sent with all future callbacks. Max 256 characters.
      * @param DiversionTreatment|null $diversionTreatment            How Diversion headers are handled on the outbound leg.
      * @param DiversionReason|null    $diversionReason               Only considered when diversionTreatment is stack.
+     * @param AttestationLevel|null   $requestedAttestationLevel              STIR/SHAKEN attestation level to sign the transferred call with. Only applies to accounts using the Hosted Signing Service. Cannot be combined with identity.
+     * @param string|null             $identity                      SIP Identity header value (PASSporT) signed by you, sent unmodified. Max 2000 characters. Cannot be combined with requestedAttestationLevel.
      */
     public function __construct(
         array $transferTo = [],
@@ -39,6 +41,8 @@ public function __construct(
         public readonly ?string $tag = null,
         public readonly ?DiversionTreatment $diversionTreatment = null,
         public readonly ?DiversionReason $diversionReason = null,
+        public readonly ?AttestationLevel $requestedAttestationLevel = null,
+        public readonly ?string $identity = null,
     ) {
         parent::__construct('Transfer', null, $transferTo);
     }
@@ -66,6 +70,8 @@ protected function attributes(): array
             'tag' => $this->tag,
             'diversionTreatment' => $this->diversionTreatment,
             'diversionReason' => $this->diversionReason,
+            'requestedAttestationLevel' => $this->requestedAttestationLevel,
+            'identity' => $this->identity,
         ];
     }
 }
diff --git a/tests/Unit/Model/Bxml/EnumTest.php b/tests/Unit/Model/Bxml/EnumTest.php
index 4deda508..6e98bb23 100644
--- a/tests/Unit/Model/Bxml/EnumTest.php
+++ b/tests/Unit/Model/Bxml/EnumTest.php
@@ -2,6 +2,7 @@
 
 namespace Bandwidth\Test\Unit\Model\Bxml;
 
+use Bandwidth\Model\Bxml\AttestationLevel;
 use Bandwidth\Model\Bxml\DiversionReason;
 use Bandwidth\Model\Bxml\DiversionTreatment;
 use Bandwidth\Model\Bxml\FileFormat;
@@ -13,6 +14,13 @@
 
 class EnumTest extends TestCase
 {
+    public function testAttestationLevelValues(): void
+    {
+        $this->assertSame('A', AttestationLevel::A->value);
+        $this->assertSame('B', AttestationLevel::B->value);
+        $this->assertSame('C', AttestationLevel::C->value);
+    }
+
     public function testHttpMethodValues(): void
     {
         $this->assertSame('GET', HttpMethod::GET->value);
diff --git a/tests/Unit/Model/Bxml/TransferTest.php b/tests/Unit/Model/Bxml/TransferTest.php
index eb6cc17e..6fafbf2e 100644
--- a/tests/Unit/Model/Bxml/TransferTest.php
+++ b/tests/Unit/Model/Bxml/TransferTest.php
@@ -2,6 +2,7 @@
 
 namespace Bandwidth\Test\Unit\Model\Bxml;
 
+use Bandwidth\Model\Bxml\AttestationLevel;
 use Bandwidth\Model\Bxml\DiversionReason;
 use Bandwidth\Model\Bxml\DiversionTreatment;
 use Bandwidth\Model\Bxml\Hangup;
@@ -37,7 +38,9 @@ public function testAllAttributes(): void
             fallbackPassword: 'fallbackPass',
             tag: 'my-tag',
             diversionTreatment: DiversionTreatment::PROPAGATE,
-            diversionReason: DiversionReason::NO_ANSWER
+            diversionReason: DiversionReason::NO_ANSWER,
+            requestedAttestationLevel: AttestationLevel::B,
+            identity: 'eyJhbGciOiJFUzI1NiJ9.sig;info=<https://example.com/c.pem>;ppt="shaken"'
         );
 
         $this->assertSame(
@@ -47,7 +50,10 @@ public function testAllAttributes(): void
             . ' transferCompleteFallbackUrl="/completeFallback"'
             . ' transferCompleteFallbackMethod="GET" username="user" password="pass"'
             . ' fallbackUsername="fallbackUser" fallbackPassword="fallbackPass" tag="my-tag"'
-            . ' diversionTreatment="propagate" diversionReason="no-answer"/>',
+            . ' diversionTreatment="propagate" diversionReason="no-answer"'
+            . ' requestedAttestationLevel="B"'
+            . ' identity="eyJhbGciOiJFUzI1NiJ9.sig;info=&lt;https://example.com/c.pem&gt;'
+            . ';ppt=&quot;shaken&quot;"/>',
             $transfer->toBxml()
         );
     }