diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index 05effa2..ff60a37 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -397,13 +397,14 @@
 		RSL_SpeechAlgo	coding_alg_rate
 	} with { variant (len) "LENGTHTO(reserved,dtx_d,dtx_u,spd_ind,ch_rate_type,coding_alg_rate)" }
 
-	template (value) RSL_IE_ChannelMode ts_RSL_ChanMode_SIGN(boolean dtx_downlink := false) := {
+	template (value) RSL_IE_ChannelMode ts_RSL_ChanMode_SIGN(boolean dtx_downlink := false,
+								 RSL_ChanRateType t := RSL_CHRT_SDCCH) := {
 		len := 0,	/* overwritten */
 		reserved := '000000'B,
 		dtx_d := dtx_downlink,
 		dtx_u := false,
 		spd_ind := RSL_SPDI_SIGN,
-		ch_rate_type := RSL_CHRT_SDCCH,
+		ch_rate_type := t,
 		coding_alg_rate := RSL_CMOD_NO_RESOURCE
 	}