diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index 11a4355a7..10ebd6d44 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -650,6 +650,10 @@ int rsl_chan_activate_lchan(struct gsm_lchan *lchan, u_int8_t act_type,
 	msgb_tv_put(msg, RSL_IE_MS_POWER, lchan->ms_power);
 	msgb_tv_put(msg, RSL_IE_TIMING_ADVANCE, ta);
 
+	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);