diff --git a/openbsc/src/libmsc/gsm_04_11.c b/openbsc/src/libmsc/gsm_04_11.c
index d1fdfb9..08d8fdf 100644
--- a/openbsc/src/libmsc/gsm_04_11.c
+++ b/openbsc/src/libmsc/gsm_04_11.c
@@ -888,7 +888,7 @@
 		return -EBUSY;
 	}
 
-	DEBUGP(DLSMS, "send_sms_lchan()\n");
+	DEBUGP(DLSMS, "%s()\n", __func__);
 
 	/* FIXME: allocate transaction with message reference */
 	trans = trans_alloc(conn->bts->network, conn->subscr,
@@ -996,10 +996,14 @@
 	 * if yes, send the SMS this way */
 	conn = connection_for_subscr(subscr);
 	if (conn) {
+		LOGP(DLSMS, LOGL_DEBUG, "Sending SMS via already open connection %p to %s\n",
+		     conn, subscr_name(subscr));
 		return gsm411_send_sms(conn, sms);
 	}
 
 	/* if not, we have to start paging */
+	LOGP(DLSMS, LOGL_DEBUG, "Sending SMS: no connection open, start paging %s\n",
+	     subscr_name(subscr));
 	res = subscr_request_channel(subscr, RSL_CHANNEED_SDCCH,
 					paging_cb_send_sms, sms);
 	if (!res) {