diff --git a/ttcn/LibIms_Steps.ttcn b/ttcn/LibIms_Steps.ttcn
index e87eb2a03871a780e87e0f0bff09ac8031674763..179318156e73125bc820797a3bec2d49954982df 100644
--- a/ttcn/LibIms_Steps.ttcn
+++ b/ttcn/LibIms_Steps.ttcn
@@ -1253,6 +1253,31 @@ module LibIms_Steps
 			f_terminate_component()
 		};
 
+		
+        function f_IMS_awaitDeRegistration () runs on ImsComponent
+        {	
+            var SipUrl v_passociated_url;
+            //Awaiting 1st REGISTER
+  	
+            f_awaitingREGISTER(mw_REGISTER_unauthorizedRequest_IMS);
+
+            // 401 response
+            f_sendResponse(m_Response_WWWauthenticate_IMS(c_statusLine401,
+                vc_callId, vc_cSeq,vc_caller_From, vc_caller_To, vc_via,
+                m_wwwAuthenticate(f_calculatecChallenge_forWWWAuthorization
+                                        (PX_IMS_SUT_UE1_QOP,vc_authorization.body[0].digestResponse)))
+                );
+
+            //Awaiting 2nd REGISTER	with authorization header
+            f_awaitingREGISTER(mw_REGISTER_unauthorizedRequest_IMS);//mw_REGISTER_authorizedRequest_IMS(m_Authorization_digest(mw_digestResponse(c_Integrity_protected_yes))));
+
+            // 200OK to complete the request
+//          vc_contact := vc_request.msgHeader.contact;
+//          vc_contact.contactBody.contactAddresses[0].contactParams := {{"expires",int2str(0)}};
+            v_passociated_url := vc_caller_From.addressField.nameAddr.addrSpec;
+            f_sendResponse(m_Response_2xxonREGISTER_IMS(c_statusLine200,vc_callId, vc_cSeq,vc_callee_From, vc_callee_To, vc_via,vc_contact,f_initSipUrl(c_userProfile_SCSCFwithHomeUE),v_passociated_url));
+        };
+
 		function f_SIP_postamble_UE1_withoutRegistration () runs on ImsComponent
 		{f_terminate_component()};