diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index c1b7a80..08e49b5 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -439,12 +439,26 @@
 				data, spd_ind = RSL_SPDI_DATA;
 			      )"}
 
-	template (value) RSL_IE_ChannelMode ts_RSL_ChanMode_SIGN(RSL_ChanRateType t := RSL_CHRT_SDCCH,
-								 boolean dtx_downlink := false) := {
+	template (value) RSL_IE_ChannelMode
+	ts_RSL_ChanMode_SIGN(template (value) RSL_ChanRateType t := RSL_CHRT_SDCCH,
+			     template (value) boolean dtxd := false,
+			     template (value) boolean dtxu := false) := {
 		len := 0,	/* overwritten */
 		reserved := '000000'B,
-		dtx_d := dtx_downlink,
-		dtx_u := false,
+		dtx_d := dtxd,
+		dtx_u := dtxu,
+		spd_ind := RSL_SPDI_SIGN,
+		ch_rate_type := t,
+		u := { sign := RSL_CMOD_NO_RESOURCE }
+	}
+	template RSL_IE_ChannelMode
+	tr_RSL_ChanMode_SIGN(template (present) RSL_ChanRateType t := ?,
+			     template (present) boolean dtxd := ?,
+			     template (present) boolean dtxu := ?) := {
+		len := ?,
+		reserved := ?,
+		dtx_d := dtxd,
+		dtx_u := dtxu,
 		spd_ind := RSL_SPDI_SIGN,
 		ch_rate_type := t,
 		u := { sign := RSL_CMOD_NO_RESOURCE }