the RELEAESE MODE IE is mandatory
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index 8f6037f..50aebc3 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -803,6 +803,7 @@
 	//rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
 	rh->chan_nr = lchan2chan_nr(lchan);
 	rh->link_id = link_id;
+	msgb_tv_put(msg, RSL_IE_RELEASE_MODE, 0);	/* normal release */
 
 	msg->trx = lchan->ts->trx;