diff --git a/ttcn/LibIms_Steps.ttcn b/ttcn/LibIms_Steps.ttcn
index 39b938c643a66274e3d0f7e07871bbcd24753864..1184362943bf2e1304f208c81b40f03267d2039b 100644
--- a/ttcn/LibIms_Steps.ttcn
+++ b/ttcn/LibIms_Steps.ttcn
@@ -930,7 +930,7 @@ module LibIms_Steps
 				scheme := c_urnScheme,  			// contains "urn"
                 components := { urn:= {
                         				namespaceId := "service",
-                    					namespaceSpecificString := "sos"}},
+                    					namespaceSpecificString := PX_IMS_SUT_EMERGENCY_SERVICE_namespaceSpecificString}},
 				urlParameters := omit,
 				headers := omit};
 				
@@ -1333,7 +1333,9 @@ module LibIms_Steps
 			//Preamble
 			f_init_userprofile(p_userprofile); // assignment of PIXIT values to component variable
 			vc_sdp_local := valueof(m_SDP_bandwidth(valueof(m_media_dynPT(PX_SIP_SDP_dyn, PX_SIP_SDP_encoding)), vc_userprofile));
+
 			vc_contact := valueof(m_Contact(m_SipUrl_contactIpaddr(vc_userprofile)));
+
 		}
 
 		/*
@@ -1361,6 +1363,27 @@ module LibIms_Steps
 
 		}
 
+        /*
+        *
+        * @desc  Sets variables and default initialization for user profile and handle registration and authentication with MD5 
+        * @param p_userprofile   	user profile of call
+        * @param p_cSeq_s		  	cseq parameter
+        * @param p_register		register template
+        */
+        function f_IMS_preamble_withEmergencyRegistration (in integer p_userprofile, in integer p_interface, inout CSeq p_cSeq_s, template REGISTER_Request p_register) runs on ImsComponent
+        {
+
+            f_init_interfaceprofile(p_interface);
+            //Variables & defaults initialization
+            f_IMS_preamble_woRegistration(p_userprofile, p_cSeq_s);
+            //Preamble
+            f_Registration(p_cSeq_s, p_register, PX_SIP_REGISTER_AUTHENTICATION_ENABLED, true);
+
+            //	deregistration in case of successful registration
+            vc_DeregDone := false;
+						
+        }
+
 		/*
 		 * 
 		 * @desc  Sets variables and default initialization for user profile and handle registration and authentication with MD5