libmsc/gsm_04_11.c: accept MT SMS messages over GSUP

Change-Id: I57357982ca0e51f6722c24a4aa1d0fb3e6caef88
Depends-on: (core) Ibe325c64ae2d6c626b232533bb4cbc65fc2b5d71
Depends-on: (OsmoHLR) I0589ff27933e9bca2bcf93b8259004935778db8f
Related Change-Id: (TTCN) I63a25c8366cce0852df6b628365151661a22a25f
Related: OS#3587
diff --git a/src/libmsc/gsm_04_08.c b/src/libmsc/gsm_04_08.c
index 7ff8681..686194f 100644
--- a/src/libmsc/gsm_04_08.c
+++ b/src/libmsc/gsm_04_08.c
@@ -1810,6 +1810,11 @@
 		DEBUGP(DMSC, "Routed to GSM 04.11 MO handler\n");
 		return gsm411_gsup_mo_handler(vsub, gsup_msg);
 
+	/* GSM 04.11 code implementing MT SMS */
+	case OSMO_GSUP_MSGT_MT_FORWARD_SM_REQUEST:
+		DEBUGP(DMSC, "Routed to GSM 04.11 MT handler\n");
+		return gsm411_gsup_mt_handler(vsub, gsup_msg);
+
 	default:
 		LOGP(DMM, LOGL_ERROR, "No handler found for %s, dropping message...\n",
 			osmo_gsup_message_type_name(gsup_msg->message_type));