From 34363908b1d87e88b4c428972dbed88751c23e84 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Sat, 1 Aug 2020 17:03:31 +0200
Subject: BS-11: Send proprietary MRPCI message after assignment + HO complete

This is a non-standard RSL message that must be sent after each traffic
channel has been established.  Without it, any voice call will be
disconnected within seconds.

This is a hack; we need to store the subscribers classmark2 value and
use it here.

Change-Id: I6cb6d25e405aa888c4df4022d897330a6af9e946
Related: OS#2389
---
 src/osmo-bsc/assignment_fsm.c | 10 ++++++++++
 src/osmo-bsc/handover_fsm.c   |  9 +++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/osmo-bsc/assignment_fsm.c b/src/osmo-bsc/assignment_fsm.c
index ca29daabb..4034dae64 100644
--- a/src/osmo-bsc/assignment_fsm.c
+++ b/src/osmo-bsc/assignment_fsm.c
@@ -32,6 +32,7 @@
 #include <osmocom/bsc/osmo_bsc_lcls.h>
 #include <osmocom/bsc/bsc_msc_data.h>
 #include <osmocom/bsc/gsm_08_08.h>
+#include <osmocom/bsc/gsm_04_08_rr.h>
 #include <osmocom/bsc/lchan_select.h>
 #include <osmocom/bsc/abis_rsl.h>
 #include <osmocom/bsc/bts.h>
@@ -224,10 +225,19 @@ static void send_assignment_complete(struct gsm_subscriber_connection *conn)
 
 static void assignment_success(struct gsm_subscriber_connection *conn)
 {
+	struct gsm_bts *bts;
+
 	/* Take on the new lchan */
 	gscon_change_primary_lchan(conn, conn->assignment.new_lchan);
 	conn->assignment.new_lchan = NULL;
 
+	bts = conn_get_bts(conn);
+	if (is_siemens_bts(bts) && ts_is_tch(conn->lchan->ts)) {
+		/* HACK: store the actual Classmark 2 LV from the subscriber and use it here! */
+		uint8_t cm2_lv[] = { 0x02, 0x00, 0x00 };
+		send_siemens_mrpci(conn->lchan, cm2_lv);
+	}
+
 	/* apply LCLS configuration (if any) */
 	lcls_apply_config(conn);
 
diff --git a/src/osmo-bsc/handover_fsm.c b/src/osmo-bsc/handover_fsm.c
index 8ed5945c5..48668e55b 100644
--- a/src/osmo-bsc/handover_fsm.c
+++ b/src/osmo-bsc/handover_fsm.c
@@ -863,8 +863,17 @@ void handover_end(struct gsm_subscriber_connection *conn, enum handover_result r
 	LOG_HO(conn, LOGL_INFO, "Result: %s\n", handover_result_name(result));
 
 	if (ho->new_lchan && result == HO_RESULT_OK) {
+		struct gsm_bts *bts;
+
 		gscon_change_primary_lchan(conn, conn->ho.new_lchan);
 		ho->new_lchan = NULL;
+
+		bts = conn_get_bts(conn);
+		if (is_siemens_bts(bts) && ts_is_tch(conn->lchan->ts)) {
+			/* HACK: store the actual Classmark 2 LV from the subscriber and use it here! */
+			uint8_t cm2_lv[] = { 0x02, 0x00, 0x00 };
+			send_siemens_mrpci(conn->lchan, cm2_lv);
+		}
 	}
 
 	osmo_fsm_inst_dispatch(conn->fi, GSCON_EV_HANDOVER_END, &result);
-- 
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