diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index f6e0b87..0dee79b 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -648,6 +648,11 @@
 			msgb_tlv_put(msg, RSL_IE_ENCR_INFO, rc, encr_info);
 	}
 
+	if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+		msgb_tlv_put(msg, RSL_IE_MR_CONFIG, sizeof(lchan->mr_conf),
+			     (u_int8_t *) &lchan->mr_conf);
+	}
+
 	msg->trx = lchan->ts->trx;
 
 	return abis_rsl_sendmsg(msg);
diff --git a/openbsc/src/chan_alloc.c b/openbsc/src/chan_alloc.c
index bd3ec85..7ba679c 100644
--- a/openbsc/src/chan_alloc.c
+++ b/openbsc/src/chan_alloc.c
@@ -215,6 +215,9 @@
 		/* clear sapis */
 		memset(lchan->sapis, 0, ARRAY_SIZE(lchan->sapis));
 
+		/* clear multi rate config */
+		memset(&lchan->mr_conf, 0, sizeof(lchan->mr_conf));
+
 		/* Configure the time and start it so it will be closed */
 		lchan->release_timer.cb = auto_release_channel;
 		lchan->release_timer.data = lchan;
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index 4d352bc..1f82354 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -3139,7 +3139,7 @@
 {
 	struct gsm_mncc *mode = arg;
 
-	return gsm48_lchan_modify(trans->lchan, mode->lchan_mode, NULL);
+	return gsm48_lchan_modify(trans->lchan, mode->lchan_mode);
 }
 
 static struct downstate {
diff --git a/openbsc/src/gsm_04_08_utils.c b/openbsc/src/gsm_04_08_utils.c
index 1a0af37..b2fbdc2 100644
--- a/openbsc/src/gsm_04_08_utils.c
+++ b/openbsc/src/gsm_04_08_utils.c
@@ -504,8 +504,7 @@
 }
 
 /* Chapter 9.1.2: Assignment Command */
-int gsm48_send_rr_ass_cmd(struct gsm_lchan *lchan, u_int8_t power_command,
-			  struct gsm48_multi_rate_conf *conf)
+int gsm48_send_rr_ass_cmd(struct gsm_lchan *lchan, u_int8_t power_command)
 {
 	struct msgb *msg = gsm48_msgb_alloc();
 	struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
@@ -536,13 +535,13 @@
 
 	/* in case of multi rate we need to attach a config */
 	if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
-		if (!conf) {
+		if (lchan->mr_conf.ver == 0) {
 			DEBUGP(DRR, "BUG: Using multirate codec without multirate config.\n");
 		} else {
 			u_int8_t *data = msgb_put(msg, 4);
 			data[0] = GSM48_IE_MUL_RATE_CFG;
 			data[1] = 0x2;
-			memcpy(&data[2], conf, 2);
+			memcpy(&data[2], &lchan->mr_conf, 2);
 		}
 	}
 
@@ -550,8 +549,7 @@
 }
 
 /* 9.1.5 Channel mode modify: Modify the mode on the MS side */
-int gsm48_tx_chan_mode_modify(struct gsm_lchan *lchan, u_int8_t mode,
-			      struct gsm48_multi_rate_conf *conf)
+int gsm48_tx_chan_mode_modify(struct gsm_lchan *lchan, u_int8_t mode)
 {
 	struct msgb *msg = gsm48_msgb_alloc();
 	struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
@@ -576,26 +574,25 @@
 	cmm->mode = mode;
 
 	/* in case of multi rate we need to attach a config */
-	if (mode == GSM48_CMODE_SPEECH_AMR) {
-		if (!conf) {
+	if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+		if (lchan->mr_conf.ver == 0) {
 			DEBUGP(DRR, "BUG: Using multirate codec without multirate config.\n");
 		} else {
 			u_int8_t *data = msgb_put(msg, 4);
 			data[0] = GSM48_IE_MUL_RATE_CFG;
 			data[1] = 0x2;
-			memcpy(&data[2], conf, 2);
+			memcpy(&data[2], &lchan->mr_conf, 2);
 		}
 	}
 
 	return gsm48_sendmsg(msg, NULL);
 }
 
-int gsm48_lchan_modify(struct gsm_lchan *lchan, u_int8_t lchan_mode,
-		       struct gsm48_multi_rate_conf *conf)
+int gsm48_lchan_modify(struct gsm_lchan *lchan, u_int8_t lchan_mode)
 {
 	int rc;
 
-	rc = gsm48_tx_chan_mode_modify(lchan, lchan_mode, conf);
+	rc = gsm48_tx_chan_mode_modify(lchan, lchan_mode);
 	if (rc < 0)
 		return rc;