diff --git a/osmo-smdpp.py b/osmo-smdpp.py
index e9638aac..a044b9ba 100755
--- a/osmo-smdpp.py
+++ b/osmo-smdpp.py
@@ -481,6 +481,9 @@ class SmDppHttpServer:
     @rsp_api_wrapper
     def handleNotification(self, request: IRequest, content: dict) -> dict:
         """See ES9+ HandleNotification in SGP.22 Section 5.6.4"""
+        # SGP.22 Section 6.3: "A normal notification function execution status (MEP Notification)
+        # SHALL be indicated by the HTTP status code '204' (No Content) with an empty HTTP response body"
+        request.setResponseCode(204)
         pendingNotification_bin = b64decode(content['pendingNotification'])
         pendingNotification = rsp.asn1.decode('PendingNotification', pendingNotification_bin)
         print("Rx %s: %s" % pendingNotification)
diff --git a/pySim/esim/es9p.py b/pySim/esim/es9p.py
index 41f2eeb2..2c4b10f7 100644
--- a/pySim/esim/es9p.py
+++ b/pySim/esim/es9p.py
@@ -136,6 +136,7 @@ class HandleNotification(Es9PlusApiFunction):
         'pendingNotification': param.PendingNotification,
       }
     input_mandatory = ['pendingNotification']
+    expected_http_status = 204
 
 # ES9+ CancelSession function (SGP.22 section 6.5.2.10)
 class CancelSession(Es9PlusApiFunction):