diff --git a/library/RSL_Emulation.ttcn b/library/RSL_Emulation.ttcn
index 3ad062be0..3634373dd 100644
--- a/library/RSL_Emulation.ttcn
+++ b/library/RSL_Emulation.ttcn
@@ -350,6 +350,7 @@ function main(boolean bts_role := true) runs on RSL_Emulation_CT {
 		[bts_role] 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)));
 			}
+		[not bts_role] IPA_PT.receive(ASP_IPA_Event:{up_down := ASP_IPA_EVENT_ID_ACK}) { }
 		[bts_role] IPA_PT.receive(tr_RSL(tr_RSL_IMM_ASSIGN)) -> value rx_rsl {
 			var GsmRrMessage rr;
 			var OCT1 ra;