msc: TC_lu_and_mt/mo_csd: reduce call open time

Related: OS#4394
Change-Id: Ie733028f7953d5d9fa1907efdb19485dee93ece9
diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index 9a21b5d..64e2aff 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -1837,12 +1837,12 @@
 	deactivate(dlcx);
 }
 
-function f_mt_call(inout CallParameters cpars)
+function f_mt_call(inout CallParameters cpars, float open_time := 5.0)
 runs on BSC_ConnHdlr {
 
 	f_mt_call_establish(cpars);
 
-	f_call_keep_open(cpars);
+	f_call_keep_open(cpars, open_time);
 
 	log("Hangup");
 	f_call_hangup(cpars, true);
@@ -1853,12 +1853,12 @@
 	setverdict(pass);
 }
 
-function f_mo_call(inout CallParameters cpars)
+function f_mo_call(inout CallParameters cpars, float open_time := 5.0)
 runs on BSC_ConnHdlr {
 
 	f_mo_call_establish(cpars);
 
-	f_call_keep_open(cpars);
+	f_call_keep_open(cpars, open_time);
 
 	log("Hangup");
 	f_call_hangup(cpars, false);