drop legacy hack: do not start MGW endp in loopback mode

We used to tell osmo-mgw to create an IuUP endpoint in loopback mode, in
order to hack it into responding to an IuUP Initialization. The loopback
mode here in osmo-hnbgw is a leftover from that hack. Drop it.

Change-Id: I0eca75d7abf66f8b9fde9c68ec10d4265f64a189
---
M TODO-RELEASE
M src/osmo-hnbgw/mgw_fsm.c
2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/TODO-RELEASE b/TODO-RELEASE
index b5a838d..a80e188 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,4 +7,7 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what		description / commit summary line
-osmo-iuh  >1.5.0  proper decoding of X.213 IPv4 address len=7
\ No newline at end of file
+osmo-iuh  >1.5.0  proper decoding of X.213 IPv4 address len=7
+
+MGW	MGCP CRCX	osmo-hnbgw used to CRCX in loopback mode, to trigger a legacy IuUP hack. CRCX is no
+			longer in loopback mode now, so older osmo-mgw may fail to respond to IuUP Initialization.
diff --git a/src/osmo-hnbgw/mgw_fsm.c b/src/osmo-hnbgw/mgw_fsm.c
index d0dc6df..48b4899 100644
--- a/src/osmo-hnbgw/mgw_fsm.c
+++ b/src/osmo-hnbgw/mgw_fsm.c
@@ -175,7 +175,7 @@
 	mgw_info = (struct mgcp_conn_peer) {
 		.call_id = (map->rua_ctx_id << 8) | mgw_fsm_priv->rab_id,
 		.ptime = 20,
-		.conn_mode = MGCP_CONN_LOOPBACK,
+		.conn_mode = MGCP_CONN_RECV_SEND,
 	};
 	mgw_info.codecs[0] = CODEC_IUFP;
 	mgw_info.codecs_len = 1;

