diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index 6681024a4..acf7d40af 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -830,7 +830,8 @@ module RSL_Types {
 		variant (len) "LENGTHTO(mr_speech_ver,nscb,icmi,spare,start_mode,codec_modes,parameters)"
 	};
 	template (value) RSL_IE_MultirateCfg ts_RSL_MultirateCfg(boolean icmi := true, uint2_t start_mode := 0,
-								 BIT8 codec_modes := '00000100'B /* 5,90k */) := {
+								 BIT8 codec_modes := '00000100'B /* 5,90k */,
+								 octetstring params := ''O) := {
 		len := 2,
 		mr_speech_ver := 1,
 		nscb := false,
@@ -838,7 +839,7 @@ module RSL_Types {
 		spare := '0'B,
 		start_mode := start_mode,
 		codec_modes := codec_modes,
-		parameters := ''O
+		parameters := params
 	}
 
 	/* 9.3.53 */