diff --git a/openbsc/src/abis_nm.c b/openbsc/src/abis_nm.c
index 4d4cec0..b1fe97d 100755
--- a/openbsc/src/abis_nm.c
+++ b/openbsc/src/abis_nm.c
@@ -2699,6 +2699,19 @@
 				     attr, attr_len);
 }
 
+void gsm_trx_lock_rf(struct gsm_bts_trx *trx, int locked)
+{
+	int new_state = locked ? NM_STATE_LOCKED : NM_STATE_UNLOCKED;
+
+	trx->rf_locked = locked;
+	if (!trx->bts || !trx->bts->oml_link)
+		return;
+
+	abis_nm_chg_adm_state(trx->bts, NM_OC_RADIO_CARRIER,
+			      trx->bts->bts_nr, trx->nr, 0xff,
+			      new_state);
+}
+
 static const char *ipacc_testres_names[] = {
 	[NM_IPACC_TESTRES_SUCCESS]	= "SUCCESS",
 	[NM_IPACC_TESTRES_TIMEOUT]	= "TIMEOUT",