diff --git a/models/bxml/verbs/PhoneNumber.ts b/models/bxml/verbs/PhoneNumber.ts
index c9d091a..e63e918 100644
--- a/models/bxml/verbs/PhoneNumber.ts
+++ b/models/bxml/verbs/PhoneNumber.ts
@@ -12,6 +12,7 @@ export interface PhoneNumberAttributes {
     fallbackUsername?: string;
     fallbackPassword?: string;
     tag?: string;
+    uui?: string;
 }
 
 /**
diff --git a/tests/unit/models/bxml/verbs/PhoneNumber.test.ts b/tests/unit/models/bxml/verbs/PhoneNumber.test.ts
index 25c737f..1f7d0dc 100644
--- a/tests/unit/models/bxml/verbs/PhoneNumber.test.ts
+++ b/tests/unit/models/bxml/verbs/PhoneNumber.test.ts
@@ -13,10 +13,11 @@ describe('PhoneNumber', () => {
         password: 'initialPassword',
         fallbackUsername: 'initialFallbackUsername',
         fallbackPassword: 'initialFallbackPassword',
-        tag: 'initialTag'
+        tag: 'initialTag',
+        uui: 'initialUUI'
     };
 
-    const expected = '<PhoneNumber transferAnswerUrl="https://initial.com" transferAnswerMethod="POST" transferAnswerFallbackUrl="https://initial.com" transferAnswerFallbackMethod="POST" transferDisconnectUrl="https://initial.com" transferDisconnectMethod="POST" username="initialUsername" password="initialPassword" fallbackUsername="initialFallbackUsername" fallbackPassword="initialFallbackPassword" tag="initialTag">+19195551234</PhoneNumber>';
+    const expected = '<PhoneNumber transferAnswerUrl="https://initial.com" transferAnswerMethod="POST" transferAnswerFallbackUrl="https://initial.com" transferAnswerFallbackMethod="POST" transferDisconnectUrl="https://initial.com" transferDisconnectMethod="POST" username="initialUsername" password="initialPassword" fallbackUsername="initialFallbackUsername" fallbackPassword="initialFallbackPassword" tag="initialTag" uui="initialUUI">+19195551234</PhoneNumber>';
 
     test('should create a PhoneNumber Verb', () => {
         const phoneNumber = new PhoneNumber('+19195551234', attributes);