diff --git a/flowroutenumbersandmessaging/controllers/messages_controller.py b/flowroutenumbersandmessaging/controllers/messages_controller.py
index a2a66bb..d8fe3c3 100644
--- a/flowroutenumbersandmessaging/controllers/messages_controller.py
+++ b/flowroutenumbersandmessaging/controllers/messages_controller.py
@@ -296,3 +296,50 @@ class MessagesController(BaseController):
                                              body))
 
         return self.handle_request_and_response(_request)
+
+    def set_did_level_dlr_callback(self, number_id, dlr_url):
+        """Does a POST request to /v2/numbers/number_id/relationships/dlr_callback
+
+        Sets the callback url for all delivery receipts (dlrs) for the
+            specified did
+
+        Args:
+            number_id (integer): pk of the DID record
+            url (string): The callback url to be hit.
+
+        Returns:
+            mixed: Response from the API. ACCEPTED
+
+        Raises:
+            APIException: When an error occurs while fetching the data from
+                the remote API. This exception includes the HTTP Response
+                code, an error message, and the HTTP body that was received in
+                the request.
+        """
+
+        # Prepare query URL
+        _query_builder = Configuration.base_uri
+        _query_builder += '/v2/numbers/{}/relationships/dlr_callback'.format(number_id)
+        _query_url = APIHelper.clean_url(_query_builder)
+
+        # Prepare headers
+        _headers = {
+            'accept': 'application/vnd.api+json',
+            'content-type': 'application/vnd.api+json; charset=utf-8'
+        }
+
+        body = {
+            'data': {
+                'attributes': {
+                    'callback_url': dlr_url
+                }
+            }
+        }
+
+        # Prepare and execute request
+        _request = self.http_client.post(_query_url,
+                                         headers=_headers,
+                                         parameters=APIHelper.json_serialize(
+                                             body))
+
+        return self.handle_request_and_response(_request)
\ No newline at end of file
diff --git a/number_route_message_demo.py b/number_route_message_demo.py
index 6356fd6..ed7d4a0 100755
--- a/number_route_message_demo.py
+++ b/number_route_message_demo.py
@@ -13,7 +13,7 @@ print("Number/Route Management v2 & Messaging v2.1 Demo")
 # Set up your api credentials and test mobile number for outbound SMS or MMS
 # basic_auth_user_name = os.environ.get('FR_ACCESS_KEY')
 # basic_auth_password = os.environ.get('FR_SECRET_KEY')
-mobile_number = "4254664078"
+mobile_number = "YOUR NUMBER HERE"
 
 
 # Instantiate API client and create controllers for Numbers,
@@ -254,6 +254,10 @@ dlr_url = 'http://example.com/dlr'
 result = messages_controller.set_account_level_dlr_callback(dlr_url)
 pprint.pprint(result)
 
+print("\n---Set a DID Level DLR Callback URL")
+dlr_url = 'http://example.com/did/dlr'
+result = messages_controller.set_did_level_dlr_callback(number_id, dlr_url)
+pprint.pprint(result)
 
 # --------------------- Porting -----------------------------------------