diff --git a/library/L1CTL_PortType.ttcn b/library/L1CTL_PortType.ttcn
index c595b03..cc2ff93 100644
--- a/library/L1CTL_PortType.ttcn
+++ b/library/L1CTL_PortType.ttcn
@@ -201,14 +201,12 @@
 		}
 		T.stop;
 	}
-	function f_L1CTL_DM_EST_REQ(L1CTL_PT pt, Arfcn arfcn, RslChannelNr chan_nr, GsmTsc tsc) {
-		pt.send(ts_L1CTL_DM_EST_REQ(arfcn, chan_nr, tsc));
-	}
 
 	/* Send DM_EST_REQ from parameters derived from IMM ASS */
 	function f_L1CTL_DM_EST_REQ_IA(L1CTL_PT pt, ImmediateAssignment imm_ass) {
-		f_L1CTL_DM_EST_REQ(pt, { false, imm_ass.chan_desc.arfcn }, imm_ass.chan_desc.chan_nr,
-				   imm_ass.chan_desc.tsc);
+		pt.send(ts_L1CTL_DM_EST_REQ_H0(imm_ass.chan_desc.chan_nr,
+					       imm_ass.chan_desc.tsc,
+					       imm_ass.chan_desc.arfcn));
 	}
 
 	/* Send DM_REL_REQ from parameters derived from IMM ASS */
diff --git a/library/L1CTL_Types.ttcn b/library/L1CTL_Types.ttcn
index e939f72..0870a20 100644
--- a/library/L1CTL_Types.ttcn
+++ b/library/L1CTL_Types.ttcn
@@ -548,7 +548,9 @@
 		}
 	}
 
-	template L1ctlUlMessage ts_L1CTL_DM_EST_REQ(Arfcn arfcn, RslChannelNr chan_nr, GsmTsc tsc) := {
+	/* Base template to be inherited by ts_L1CTL_DM_EST_REQ_H0 and ts_L1CTL_DM_EST_REQ_H1 */
+	private template (value) L1ctlUlMessage ts_L1CTL_DM_EST_REQ(template (value) RslChannelNr chan_nr,
+								    template (value) GsmTsc tsc) := {
 		header := ts_L1ctlHeader(L1CTL_DM_EST_REQ),
 		ul_info := {
 			chan_nr := chan_nr,
@@ -560,15 +562,25 @@
 		payload := {
 			dm_est_req := {
 				tsc := tsc,
-				h := 0,
-				arfcn := arfcn,
-				hopping := omit,
 				tch_mode := 0,
 				audio_mode := t_L1CTL_AudioModeNone
 			}
 		}
 	}
 
+	template (value) L1ctlUlMessage ts_L1CTL_DM_EST_REQ_H0(template (value) RslChannelNr chan_nr,
+							       template (value) GsmTsc tsc,
+							       template (value) GsmArfcn arfcn)
+	modifies ts_L1CTL_DM_EST_REQ := {
+		payload := {
+			dm_est_req := {
+				h := 0,
+				arfcn := { false, arfcn },
+				hopping := omit
+			}
+		}
+	}
+
 	template L1ctlUlMessage ts_L1CTL_DM_REL_REQ(RslChannelNr chan_nr) := {
 		header := ts_L1ctlHeader(L1CTL_DM_REL_REQ),
 		ul_info := {
diff --git a/library/LAPDm_RAW_PT.ttcn b/library/LAPDm_RAW_PT.ttcn
index 75d18d9..394deab 100644
--- a/library/LAPDm_RAW_PT.ttcn
+++ b/library/LAPDm_RAW_PT.ttcn
@@ -246,7 +246,7 @@
 		set_ph_state(PH_STATE_TUNING_DCH);
 		/* store/save channel description */
 		chan_desc.chan_nr := chan_nr;
-		f_L1CTL_DM_EST_REQ(L1CTL,arfcn, chan_nr, tsc);
+		L1CTL.send(ts_L1CTL_DM_EST_REQ_H0(chan_nr, tsc, arfcn.arfcn));
 		set_ph_state(PH_STATE_DCH);
 	}