diff --git a/identity_insights/src/vonage_identity_insights/responses.py b/identity_insights/src/vonage_identity_insights/responses.py
index 4b5c4dfc..6239ce5c 100644
--- a/identity_insights/src/vonage_identity_insights/responses.py
+++ b/identity_insights/src/vonage_identity_insights/responses.py
@@ -13,7 +13,7 @@ class InsightStatus(BaseModel):
     """
 
     code: str
-    message: Optional[str]
+    message: Optional[str] = None
 
 
 class FormatInsightResponse(BaseModel):
@@ -34,14 +34,14 @@ class FormatInsightResponse(BaseModel):
         status (InsightStatus): Processing status of the insight.
     """
 
-    country_code: Optional[str]
-    country_name: Optional[str]
-    country_prefix: Optional[str]
-    offline_location: Optional[str]
-    time_zones: Optional[List[str]]
-    number_international: Optional[str]
-    number_national: Optional[str]
-    is_format_valid: Optional[bool]
+    country_code: Optional[str] = None
+    country_name: Optional[str] = None
+    country_prefix: Optional[str] = None
+    offline_location: Optional[str] = None
+    time_zones: Optional[List[str]] = None
+    number_international: Optional[str] = None
+    number_national: Optional[str] = None
+    is_format_valid: Optional[bool] = None
     status: InsightStatus
 
 
@@ -77,10 +77,10 @@ class CarrierInsightResponse(BaseModel):
         status (InsightStatus): Processing status of the insight.
     """
 
-    name: Optional[str]
-    network_type: Optional[str]
-    country_code: Optional[str]
-    network_code: Optional[str]
+    name: Optional[str] = None
+    network_type: Optional[str] = None
+    country_code: Optional[str] = None
+    network_code: Optional[str] = None
     status: InsightStatus
 
 
diff --git a/identity_insights/tests/data/nullable_response.json b/identity_insights/tests/data/nullable_response.json
new file mode 100644
index 00000000..eb6aa5b8
--- /dev/null
+++ b/identity_insights/tests/data/nullable_response.json
@@ -0,0 +1,16 @@
+{
+   "request_id": "aaaaaaaa-bbbb-cccc-dddd-0123456789ab",
+   "insights": {
+      "format": {
+         "status": {
+            "code": "OK"
+         }
+      },
+      "original_carrier": {
+         "status": {
+            "code": "OK",
+            "message": "Success"
+         }
+      }
+   }
+}
diff --git a/identity_insights/tests/test_identity_insights.py b/identity_insights/tests/test_identity_insights.py
index bcc316cb..e7347b62 100644
--- a/identity_insights/tests/test_identity_insights.py
+++ b/identity_insights/tests/test_identity_insights.py
@@ -74,3 +74,35 @@ def test_empty_insights_request_raises_exception():
 
     with raises(EmptyInsightsRequestException):
         identity_insights.requests(options)
+
+
+@responses.activate
+def test_nullable_response_fields():
+    build_response(
+        path,
+        'POST',
+        'https://api-eu.vonage.com/identity-insights/v1/requests',
+        'nullable_response.json',
+    )
+
+    options = IdentityInsightsRequest(
+        phone_number="1234567890", insights=InsightsRequest(format=EmptyInsight())
+    )
+
+    response = identity_insights.requests(options)
+
+    # Verify that optional fields with missing values are None
+    assert response.insights.format.country_code is None
+    assert response.insights.format.country_name is None
+    assert response.insights.format.time_zones is None
+    assert response.insights.format.is_format_valid is None
+    assert response.insights.format.status.code == "OK"
+    assert response.insights.format.status.message is None
+
+    # Verify original_carrier fields are None when not provided
+    assert response.insights.original_carrier.name is None
+    assert response.insights.original_carrier.network_type is None
+    assert response.insights.original_carrier.country_code is None
+    assert response.insights.original_carrier.network_code is None
+    assert response.insights.original_carrier.status.code == "OK"
+    assert response.insights.original_carrier.status.message == "Success"