diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index 6afeca2..55cdb89 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -426,8 +426,9 @@
 		}
 	[st.rr_ass_cmpl_seen] RSL.receive(tr_RSL_RF_CHAN_REL(st.old_chan_nr)) {
 		RSL.send(ts_RSL_RF_CHAN_REL_ACK(st.old_chan_nr));
-		/* FIXME: unregister for old channel number in RSL emulation */
-		//f_rslem_unregister(0, st.old_chan_nr);
+		/* unregister for old channel number in RSL emulation */
+		/* FIXME: Determine TRX NR by ARFCN, instead of hard-coded TRX0! */
+		f_rslem_unregister(0, st.old_chan_nr);
 		st.assignment_done := true;
 		repeat;
 		}