diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index 6f8846f..6c45ca9 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -814,6 +814,31 @@
 		slot_count := slot_count
 	}
 
+	/* 9.3.52, 3GPP TS 44.018 10.5.2.21aa  */
+	type record RSL_IE_MultirateCfg {
+		uint8_t 	len,
+		uint3_t		mr_speech_ver,
+		boolean		nscb,
+		boolean		icmi,
+		BIT1		spare,
+		uint2_t		start_mode,
+		BIT8		amr_codec_modes,
+		octetstring	parameters
+	} with {
+		variant (len) "LENGTHTO(mr_speech_ver,nscb,icmi,spare,start_mode,amr_codec_modes,parameters)"
+	};
+	template (value) RSL_IE_MultirateCfg ts_RSL_MultirateCfg(boolean icmi := true, uint2_t start_mode := 0,
+								 BIT8 amr_codec_modes := '00000100'B /* 5,90k */) := {
+		len := 2,
+		mr_speech_ver := 1,
+		nscb := false,
+		icmi := icmi,
+		spare := '0'B,
+		start_mode := start_mode,
+		amr_codec_modes := amr_codec_modes,
+		parameters := ''O
+	}
+
 	/* 9.3.53 */
 	type record RSL_IE_MultirateCtrl {
 		uint3_t		spare,
@@ -952,6 +977,7 @@
 		RSL_IE_MS_Power		ms_power,
 		RSL_IE_MS_Power_Parameters ms_power_params,
 		uint8_t			timing_adv,
+		RSL_IE_MultirateCfg	multirate_cfg,
 		RSL_IE_MultirateCtrl	multirate_ctrl,
 		uint8_t			msg_id,
 		RSL_IE_FrameNumber	frame_nr,
@@ -1014,6 +1040,7 @@
 					ms_power, iei = RSL_IE_MS_POWER;
 					ms_power_params, iei = RSL_IE_MS_POWER_PARAM;
 					timing_adv, iei = RSL_IE_TIMING_ADVANCE;
+					multirate_cfg, iei = RSL_IE_MR_CONFIG;
 					multirate_ctrl, iei = RSL_IE_MR_CONTROL;
 					msg_id, iei = RSL_IE_MSG_ID;