diff --git a/library/RSL_Emulation.ttcn b/library/RSL_Emulation.ttcn
index f45b425..dab1785 100644
--- a/library/RSL_Emulation.ttcn
+++ b/library/RSL_Emulation.ttcn
@@ -54,9 +54,10 @@
 
 signature RSLEM_register(uint8_t trx_nr, RslChannelNr chan_nr, RSL_DchanHdlr hdlr);
 signature RSLEM_unregister(uint8_t trx_nr, RslChannelNr chan_nr, RSL_DchanHdlr hdlr);
+signature RSLEM_suspend(boolean suspend);
 
 type port RSLEM_PROC_PT procedure {
-	inout RSLEM_register, RSLEM_unregister;
+	inout RSLEM_register, RSLEM_unregister, RSLEM_suspend;
 } with { extension "internal" };
 
 /***********************************************************************
@@ -276,6 +277,8 @@
 	var uint8_t trx_nr;
 	var integer cid;
 	var integer i;
+	/* special synchronization handling during hand-over */
+	var boolean dchan_suspended := false;
 
 	f_conn_table_init();
 
@@ -348,7 +351,7 @@
 			IPA_PT.send(ts_ASP_RSL_UD(rx_rsl.streamId, ts_RSL_CHAN_ACT_ACK(chan_nr, 23)));
 		}
 
-		[] IPA_PT.receive(tr_RSL(tr_RSL_MsgTypeDR(?))) -> value rx_rsl {
+		[not dchan_suspended] IPA_PT.receive(tr_RSL(tr_RSL_MsgTypeDR(?))) -> value rx_rsl {
 			/* dispatch to channel based on ChanId */
 			cid := f_cid_by_chan_nr(f_trx_by_streamId(rx_rsl.streamId),
 						rx_rsl.rsl.ies[0].body.chan_nr);
@@ -359,7 +362,7 @@
 			}
 		}
 
-		[] IPA_PT.receive {
+		[not dchan_suspended] IPA_PT.receive {
 			setverdict(fail, "Received unknown primitive from IPA");
 			self.stop;
 		}
@@ -389,6 +392,17 @@
 			RSL_PROC.reply(RSLEM_unregister:{trx_nr, chan_nr, vc_conn});
 			}
 
+		[] RSL_PROC.getcall(RSLEM_suspend:{true}) {
+			log("Suspending DChan");
+			dchan_suspended := true;
+			RSL_PROC.reply(RSLEM_suspend:{true});
+			}
+
+		[] RSL_PROC.getcall(RSLEM_suspend:{false}) {
+			log("Resuming DChan");
+			dchan_suspended := false;
+			RSL_PROC.reply(RSLEM_suspend:{false});
+			}
 
 		}
 	}
@@ -420,5 +434,22 @@
 	}
 }
 
+/* resume handling of RSL DChan messages from IPA until f_rslem_resume() is called */
+function f_rslem_suspend(RSLEM_PROC_PT PT)
+runs on RSL_DchanHdlr {
+	PT.call(RSLEM_suspend:{true}) {
+		[] PT.getreply(RSLEM_suspend:{true}) {};
+	}
+}
+
+/* resume handling of RSL DChan messages after f_rslem_suspend() is called */
+function f_rslem_resume(RSLEM_PROC_PT PT)
+runs on RSL_DchanHdlr {
+	PT.call(RSLEM_suspend:{false}) {
+		[] PT.getreply(RSLEM_suspend:{false}) {};
+	}
+}
+
+
 
 }