diff --git a/library/RSL_Emulation.ttcn b/library/RSL_Emulation.ttcn
index d558412..a42ca1e 100644
--- a/library/RSL_Emulation.ttcn
+++ b/library/RSL_Emulation.ttcn
@@ -199,6 +199,8 @@
 
 	while (true) {
 		alt {
+		[] IPA_PT.receive(ASP_IPA_Event:{up_down := ASP_IPA_EVENT_UP}) {
+			}
 		[] IPA_PT.receive(ASP_IPA_Event:{up_down := ASP_IPA_EVENT_ID_ACK}) {
 			IPA_PT.send(ts_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,ts_RSL_PAGING_LOAD_IND(23)));
 			}